Liquid injection head and oral cleaning device

Abstract

To provide a liquid injection head capable of efficiently cleaning a target object even when in close contact therewith.SOLUTION: A liquid injection head comprises: an injection surface with multiple injection holes formed for injecting a liquid; multiple suction ports for sucking the liquid injected from the injection holes, and a protrusion protruding from the injection surface in the injection direction of the liquid. The length of the protrusion is greater than a droplet formation distance, which is the distance at which the liquid injected from the injection holes forms droplets.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a liquid ejection head and an oral cleaning device including the liquid ejection head. [Background technology]

[0002] 2. Description of the Related Art Conventionally, liquid ejection devices are known that eject liquid from a nozzle, and utilize the fact that the ejected liquid changes from a continuous columnar stream into droplets, thereby causing the droplets to collide with an object to perform cleaning, incision, and the like.

[0003] For example, Patent Document 1 proposes a liquid injection device that includes an injection tube having a nozzle opening at an end, a separation tube surrounding the injection tube, and a suction tube surrounding the separation tube and having a first opening, with the distance between the nozzle opening and the first opening being equal to or greater than the dropletization distance, which is the distance at which the liquid injected from the nozzle opening changes from a columnar continuous flow into droplets. The suction tube is a suction section that sucks up waste liquid of the liquid injected onto the target object. In Figure 4 of this document, the second opening at the tip of the separation tube is at the same height as the first opening at the tip of the suction tube. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-23366 Summary of the Invention [Problem to be solved by the invention]

[0005] However, there is room for improvement in the liquid injection device of Patent Document 1. In detail, when the suction tube is in close contact with the object, the object is sucked by the suction force of the suction tube, and the second opening of the separation tube is also blocked, so there is a risk that the injection liquid will be trapped inside the separation tube surrounding the nozzle opening. If the injection liquid is trapped inside the separation tube, it becomes difficult to suck up the waste liquid, and the cleaning efficiency decreases. In other words, there has been a demand for a liquid ejection head and oral cleaning device that can efficiently clean an object even when in close contact with the object. [Means for solving the problem]

[0006] A liquid ejection head according to one aspect of the present application comprises an ejection surface having a plurality of ejection holes formed therein for ejecting liquid, a plurality of suction ports for sucking in the liquid ejected from the ejection holes, and a protrusion protruding from the ejection surface in the ejection direction of the liquid, wherein when the distance over which the liquid ejected from the ejection holes becomes droplets is defined as a droplet formation distance, the length of the protrusion is longer than the droplet formation distance.

[0007] An oral cleaning device according to one embodiment of the present application includes the above-mentioned liquid injection head, a first flow path for transporting the liquid to the multiple injection holes, and a holding portion having therein a second flow path for collecting the liquid sucked from the multiple suction ports, and uses the liquid droplets to clean the inside of the oral cavity. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic diagram showing the configuration of an oral cleaning device according to embodiment 1. FIG. [Diagram 2] FIG. [Diagram 3] FIG. 3 is a cross-sectional view taken along line bb in FIG. 2 . [Figure 4] FIG. [Diagram 5] 1 is a diagram showing the correlation between injection hole diameter and the required number of injection holes. [Figure 6] FIG. 11 is a plan view of a liquid jet head according to a second embodiment. [Figure 7] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] EMBODIMENT 1 *** Overview of the oral cleaning device *** FIG. 1 is a schematic diagram of the oral cleaning device according to the present embodiment. The oral cleaning device 100 of this embodiment is an oral cleaning device in which a brush-shaped liquid ejection head 10 is inserted into the oral cavity, and the cleaning flow ejected from the ejection surface 11b of the liquid ejection head 10 cleans, for example, the teeth, and the brush-shaped protrusions 12 protruding from the ejection surface 11b suck up the liquid after cleaning.

[0010] As shown in FIG. 1, the oral cleaning device 100 includes a cleaning unit 25, a main body device 50, and the like. The cleaning unit 25 is composed of the liquid ejection head 10, a gripping part 20, a connection part 21, etc. The cleaning unit 25 is connected to the main body device 50 by the connection part 21 extending from the rear end of the gripping part 20. The connection part 21 is, for example, a piping bundling part made of a flexible corrugated tube, and the piping 17, 18 and the electrical wiring 23 pass through it. In each drawing, an X-axis, a Y-axis, and a Z-axis are illustrated as three mutually orthogonal axes. In this embodiment, the extension direction of the grip portion 20 is the X-plus direction, the protruding direction of the protrusion 12 from the ejection surface 11b is the Z-plus direction, and the width direction of the liquid ejection head 10 is the Y-plus direction. The X-plus direction and the X-minus direction are collectively referred to as the X-axis direction. The same applies to the Y-axis and Z-axis.

[0011] The liquid jet head 10 is brush-shaped and connected to the tip of a grip portion 20. Pipes 17 and 18 are connected to the liquid jet head 10 via a connection portion 21 and the grip portion 20. The liquid jet head 10 jets a cleaning flow from the jet surface 11b, and sucks up the liquid after cleaning by a brush-shaped protrusion 12 protruding from the jet surface 11b. Details of the liquid jet head 10 will be described later.

[0012] The grip part 20 corresponds to the handle of a toothbrush and is the part that the user grips. The grip part 20 is provided with an operation part 22. The operation part 22 includes a power button and an operation button for adjusting the cleaning intensity. Inside the grip part 20, a pipe 17 as a first flow path for supplying liquid and a pipe 18 as a second flow path for recovering liquid are laid. The pipe 17 is connected to a pump 31 of the main device 50. The pipe 18 is connected to a suction pump 32 of the main device 50. In other words, the gripping portion 20 includes a pipe 17 as a first flow path for transporting liquid to the liquid ejection head 10, and a pipe 18 as a second flow path for recovering liquid sucked from the protrusion portion 12, and is connected to the liquid ejection head 10.

[0013] 1, the main body device 50 is composed of a control unit 30, a pump 31, a suction pump 32, a memory unit 33, a liquid tank 34, and a waste liquid tank 35. Each part including the main body device 50 is supplied with power from a power supply unit (not shown). The control unit 30 is a control circuit including one or more processors, and generally controls the operation of the oral cleaning device 100 by operating according to a control program stored in the memory unit 33. The control unit 30 and the operation unit 22 are electrically connected by an electrical wiring 23. The control unit 30 receives an operation signal corresponding to an input operation to the operation unit 22 via the electrical wiring 23. The pump 31 is a pressure pump and is connected to the liquid tank 34 via a pipe 36. The pump 31 corresponds to a pressure unit, which sucks up and pressurizes the liquid in the liquid tank 34 and supplies the liquid at a predetermined pressure to the pipe 17. In other words, the oral cleaning device 100 includes the pump 31 as a pressure unit that pressurizes the liquid and sends it to the liquid ejection head 10. In a preferred example, the liquid tank 34 stores water as the liquid.

[0014] The suction pump 32 is a suction pump, and is connected to the waste liquid tank 35 via a pipe 37. The suction pump 32 sucks liquid from the brush-like protrusions 12 via the pipe 18, and collects the sucked liquid in the waste liquid tank 35. The storage unit 33 is configured with a RAM (Random Access Memory) and a ROM (Read Only Memory). The RAM is used for temporary storage of various data, and the ROM stores a control program for controlling the operation of the oral cleaning device 100 and associated data. The control program stores a startup program that instructs the order and content of processing when starting up the oral cleaning device 100. The associated data includes a data table that specifies the suction strength according to the injection pressure.

[0015] ***Liquid jet head configuration*** Fig. 2 is a plan view of the liquid jet head, and corresponds to a view seen from the P direction in Fig. 1. Fig. 3 is a cross-sectional view taken along the line bb in Fig. 2. 2, the liquid jet head 10 has a rectangular shape in plan view. In Fig. 2, the length of the long side of the liquid jet head 10 is length L5, the length of the short side is width W, and the line segment that passes through the center of the width W and extends in the direction of the X-axis is center line 60.

[0016] The liquid ejection head 10 is made up of a case body 11 made of a hard material such as metal, resin, etc. A flat surface on the Z positive side of the case body 11 is referred to as an ejection surface 11b. A plurality of injection holes 3 and a plurality of protrusions 12 are provided on the injection surface 11b. Along the center line 60 of the ejection surface 11b, from the negative X direction, protrusion 12, ejection hole 3, protrusion 12, ejection hole 3, protrusion 12, ejection hole 3, protrusion 12 are arranged at equal pitch in this order. When this arrangement is considered as the central arrangement, on the positive Y side of the central arrangement, from the negative X direction, ejection hole 3, protrusion 12, ejection hole 3, protrusion 12, ejection hole 3, protrusion 12, ejection hole 3 are arranged at equal pitch in this order. Similarly, on the negative Y side of the central arrangement, ejection hole 3, protrusion 12, ejection hole 3, protrusion 12, ejection hole 3, protrusion 12, ejection hole 3 are arranged at equal pitch in this order.

[0017] Then, along the long side on the Y minus side of ejection surface 11b, similar to the central arrangement, protrusion 12, ejection hole 3, protrusion 12, ejection hole 3, protrusion 12, ejection hole 3, protrusion 12 are arranged at equal pitches in this order from the X minus direction. Along the long side on the Y plus side of ejection surface 11b, similar to the central arrangement, protrusion 12, ejection hole 3, protrusion 12, ejection hole 3, protrusion 12, ejection hole 3, protrusion 12 are arranged at equal pitches in this order from the X minus direction. That is, on the ejection surface 11b, the ejection holes 3 and the protrusions 12 are alternately arranged at equal pitches in the X-axis direction and the Y-axis direction.

[0018] As shown in FIG. 3, the protrusion 12 is a tube member having a through hole 5 in the center, and is inserted into the case body 11. One end of the through hole 5 is connected to a pipe 18. The other end of the through hole 5 opens at the tip of the protrusion 12, and this opening becomes a suction port 5b. The multiple protrusions 12 are collectively referred to as the protrusion 13. In other words, the multiple suction ports 5b are provided at the end of the protrusion 13 opposite to the end on the ejection surface 11b side. The pipe 18 as a second flow path collects the liquid sucked from the multiple suction ports 5b. The protrusion 12 is formed of an elastic material. Examples of the elastic material that can be used include resins such as nylon, saturated polyester resin, and polypropylene, elastomers, and rubber. In other words, the protrusion 13 is composed of a plurality of elastic materials. The ejection holes 3 are nozzle holes formed as through holes provided in the ejection surface 11b of the case body 11, and are connected to the piping 17. In other words, the piping 17 as a first flow path transports liquid to the multiple ejection holes 3.

[0019] FIG. 4 is an enlarged cross-sectional view of the injection hole. 4, in a preferred embodiment, the injection hole 3 is a cylindrical through hole provided in the case body 11. The diameter d of the injection hole 3 is the same from the inlet to the outlet. However, this is not limited to the configuration, and as shown by the dotted line, the cross section of the injection hole 3 may be a truncated cone shape narrowing from the inlet to the outlet. The cleaning flow 8 ejected from the injection hole 3 is a continuous flow 8a immediately after ejection, but breaks into droplets due to the surface tension of the liquid and breaks into a group of droplets 8b. The position where droplets 8b are generated from the continuous flow 8a is the droplet formation position, and the distance from the injection surface 11b to the droplet formation position is the droplet formation distance L1. For example, in the example of Fig. 2, the diameter d of the injection hole 3 is φ0.025mm. The number of injection holes 3 is 17, and the injection pressure is about 4MPa. However, these values ​​are not limiting.

[0020] Return to Figure 3. Here, the length L2 from the ejection surface 11b to the tip of the protrusion 12 is set to be longer than the droplet formation distance L1 of the cleaning flow 8. In other words, the length L2 of the protrusion 13 is longer than the droplet formation distance L1. In a preferred embodiment, the length L2 is set to be longer than the droplet formation distance L1 in a range of 3 mm to 5 mm. However, this is not a limiting value. As a result, during cleaning, droplets 8b of the cleaning flow 8 collide with the object to be cleaned. When droplets 8b collide with dirt attached or solidified to the object to be cleaned, the impact pressure generated when the droplets collapse promotes softening (emulsification) or destruction of the dirt, and the dirt can be efficiently cleaned. Furthermore, the liquid after cleaning can be efficiently sucked by the suction port 5b at the tip of the protrusion 12. In particular, if liquid remains around the object to be cleaned, the impact pressure will attenuate, so by quickly sucking up the liquid, continuous cleaning performance can be achieved. An example of an object to be cleaned is a tooth.

[0021] In addition, because the protrusions 12 are constantly sucking, liquid is less likely to accumulate around the object to be cleaned, making it easy to use. If liquid remains, a lot of floating mist is generated around the object to be cleaned due to the impact and collapse of subsequent droplets, but because the amount of this floating mist is reduced, the drop in impact pressure caused by the floating mist is suppressed. Furthermore, when used for oral cleaning, the floating mist will not cause choking, making it safe to use. Furthermore, by forming the protrusions 12 from an elastic material, damage to the object to be cleaned can be prevented. For example, in the case of oral cleaning, the liquid ejection head 10 can be used safely in the oral cavity because the impact on the teeth and gums can be weakened to prevent damage to the gums, oral mucosa, etc. Furthermore, the tip of the protrusions 12 can be used for scrubbing like a toothbrush, which can further enhance the cleaning effect. In other words, the liquid ejection head 10 comprises an ejection surface 11b having a plurality of ejection holes 3 formed therein for ejecting liquid, a plurality of suction ports 5b for sucking in the liquid ejected from the ejection holes 3, and a protrusion 13 protruding from the ejection surface 11b in the ejection direction of the liquid, and when the distance over which the liquid ejected from the ejection holes 3 turns into droplets is defined as the droplet formation distance L1, the length L2 of the protrusion 13 is longer than the droplet formation distance L1.

[0022] The use of the liquid ejection head 10 is not limited to oral cleaning, but can be used to clean objects having dirt or stains. Examples of objects to be cleaned include daily necessities including furniture such as tables and chairs, flooring, and walls.

[0023] ***Example*** FIG. 5 is a chart showing the correlation between the injection hole diameter and the required number of injection holes. Table 90 in FIG. 5 summarizes the findings based on the experimental results of the inventors, and shows the correlation between the diameter d of the injection hole 3 and the number of injection holes 3 in a preferred example. For example, in Example 1 of Table 90, when the length L5 (FIG. 2) of the liquid jet head 10 is 15 mm and the width W is 10 mm, the diameter d of the jet hole 3 is φ0.016 mm, and the number of jet holes 3 is 27. With this setting, when the jet pressure is about 5 MPa, the droplet generation distance L1 is about 8 mm or less, and suitable cleaning performance can be obtained. Note that if the jet pressure is lowered, the droplet generation distance L1 becomes shorter.

[0024] However, the diameter d of the injection hole 3 is not limited to this value, and may be within the range of φ0.01 mm or more and 0.05 mm or less. If the diameter d exceeds 0.05 mm, the droplet generation distance L1 will be 50 mm or more, which is not suitable for cleaning the mouth. 5, for example, when the diameter d is φ0.01 mm, the number of injection holes 3 is preferably 107. When the diameter d is φ0.05 mm, the number of injection holes 3 is preferably 5. Alternatively, as in Example 2, the diameter d may be φ0.03 mm and the number of injection holes 3 may be 12. In either case, the spray pressure is preferably 0.5 MPa or more and 5 MPa or less. A spray pressure of 0.5 MPa or more makes it possible to remove dirt and deposits from the oral cavity, while a spray pressure of 5 MPa or less is appropriate for cleaning purposes. If the total flow rate of the liquid injected from all the injection holes 3 is set to 50 ml / min or less, scattering in the oral cavity is suppressed, making the liquid easier to use.

[0025] As described above, according to the liquid ejecting head 10 and the oral cleaning device 100 of the present embodiment, the following effects can be obtained. The liquid ejection head 10 comprises an ejection surface 11b having a plurality of ejection holes 3 for ejecting liquid, a plurality of suction ports 5b for sucking in the liquid ejected from the ejection holes 3, and a protrusion 13 protruding from the ejection surface 11b in the ejection direction of the liquid, and when the distance over which the liquid ejected from the ejection holes 3 turns into droplets is defined as droplet formation distance L1, the length L2 of the protrusion 13 is longer than the droplet formation distance L1.

[0026] In a preferred embodiment, the protrusion 13 is composed of a plurality of brush-like protrusions 12, and the suction port 5b is provided at the tip of the protrusion 12. Therefore, unlike conventional liquid injection devices in which the suction force of the suction tube causes the object to stick to the suction tube when the liquid injection head 10 is in close contact with the object, the protrusions 12 are dispersed, so that the entire surface is unlikely to stick to the object, and the desired cleaning performance can be achieved. In detail, when cleaning the oral cavity, droplets 8b of the cleaning flow 8 collide with the teeth. When the droplets 8b collide with dirt attached or solidified to the teeth, the impact pressure generated when the droplets break down promotes softening (emulsification) or destruction of the dirt, and the dirt can be efficiently cleaned. Furthermore, the suction port 5b at the tip of the protrusion 12 can efficiently suck in the liquid after cleaning. If the liquid remains around the teeth, the impact pressure will be attenuated, so by quickly sucking in the liquid, continuous cleaning performance can be achieved. Therefore, it is possible to provide the liquid ejecting head 10 that can be efficiently cleaned even when in close contact with an object.

[0027] Furthermore, the plurality of suction ports 5b are provided at the end of the protruding portion 13 opposite to the end on the ejection surface 11b side. With this, the height of the protruding portion 13 can ensure the droplet forming distance L1 of the cleaning flow 8, and the post-cleaning liquid can be efficiently sucked by the suction port 5b at the tip.

[0028] Moreover, the protrusion 13 is constituted by a plurality of protruding parts 12 made of an elastic member. According to this, even if the liquid ejection head 10 comes into close contact with the target object, the protrusions 12 have elasticity, so that adhesion as occurs in conventional liquid ejection devices can be prevented.

[0029] The oral cleaning device 100 includes a liquid injection head 10, piping 17 as a first flow path for transporting liquid to multiple injection holes 3, and a holding portion 20 having piping 18 as a second flow path for recovering liquid sucked from multiple suction ports 5b installed therein, and cleans the oral cavity using droplets. This makes it possible to provide an oral cleaning device 100 that can efficiently clean an object even when in close contact with the object.

[0030] The oral cleaning device 100 also includes a pump 31 as a pressurizing unit that pressurizes the liquid and sends the liquid to the liquid ejection head 10 . This allows the pump 31 to adjust the injection pressure of the cleaning flow 8 to an optimum pressure.

[0031] EMBODIMENT 2 ***Different aspects of liquid ejection head*** Fig. 6 is a plan view of a liquid jet head according to embodiment 2, and corresponds to Fig. 2. Fig. 7 is a side view of the liquid jet head, and corresponds to Fig. 3. Note that Fig. 7 illustrates a main part in a see-through manner. In the above embodiment, the protrusion 13 has been described as being composed of a plurality of protruding portions 12, but this is not limited thereto, and the protrusion 13 may be composed of a single protruding portion 15. Hereinafter, the same parts as those in the above embodiment are denoted by the same numbers, and duplicated descriptions will be omitted.

[0032] 6, the liquid jet head 14 of the present embodiment is composed of a nozzle group 43 consisting of a plurality of jet holes 3 arranged in a matrix, and a rectangular ring-shaped protrusion 15 surrounding the nozzle group 43. Note that the shape is not limited to a rectangular ring, and may be any ring shape that surrounds the nozzle group 43, such as a circular ring or an elliptical ring. In other words, the protrusion 15 is formed so as to surround the plurality of jet holes 3. The nozzle group 43 is composed of 28 injection holes 3 arranged in 4 rows and 7 columns on the injection surface 11b of the liquid injection head 14. Note that the number is not limited to this number, and the number, diameter, and the like of the injection holes 3 may be set so long as they satisfy the conditions described in FIG.

[0033] 7, like the protruding portion 12, the protruding portion 15 is provided with a height of length L2 in the Z positive direction from the ejection surface 11b. The protruding portion 15 is provided with a plurality of through holes 9, one end of which is connected to a pipe 18. The other end of the through holes 9 opens at the tip of the protruding portion 15, and this opening becomes a suction port 9b. As shown in FIG. 6, three suction ports 9b are provided along the long side of the protruding portion 15 on the Y plus side in a plan view, and three suction ports 9b are provided along the long side of the protruding portion 15 on the Y minus side in a plan view. Three suction ports 9b are provided along the short side of the protruding portion 15 on the X plus side, and three suction ports 9b are provided along the short side of the protruding portion 15 on the X minus side. That is, twelve suction ports 9b are provided in the protruding portion 15 so as to surround the nozzle group 43. In other words, the multiple suction ports 9b are provided at the end of the protruding portion 15 opposite to the end of the ejection surface 11b side. The pipe 18 as the second flow path collects the liquid sucked from the multiple suction ports 9b. The number of suction ports is not limited to this numerical value, and may be set appropriately according to the size of the liquid ejection head and the number of nozzles.

[0034] The protruding portion 15 is formed of an elastic material similar to that of the protruding portion 12. As the elastic material, for example, resins such as nylon, saturated polyester resin, and polypropylene, elastomers, rubber, and the like can be used. 7, the length L2 from the ejection surface 11b to the tip of the protruding portion 15 is set to be longer than the droplet formation distance L1 of the cleaning flow 8. In other words, the length L2 of the protruding portion 15 is longer than the droplet formation distance L1. In a preferred embodiment, the length L2 is set to be longer than the droplet formation distance L1 by a range of 3 mm to 5 mm.

[0035] As a result, when cleaning is performed using the liquid jet head 14, the droplets 8b of the cleaning flow 8 collide with the object to be cleaned. When the droplets 8b collide with dirt attached or solidified on the object to be cleaned, the impact pressure generated when the droplets collapse promotes softening (emulsification) or destruction of the dirt, and the dirt can be efficiently cleaned. Furthermore, the liquid after cleaning can be efficiently sucked in by the suction port 9b at the tip of the protrusion 15. In particular, if liquid remains around the object to be cleaned, the impact pressure will be attenuated, so by quickly sucking in the liquid, continuous cleaning performance can be achieved. In addition, since the side circumferential surface of the protruding portion 15 is closed, it is possible to prevent the mist generated by the splashing of the jet water to the surroundings and the collapse of the droplets on impact from flowing out to the surroundings of the object to be cleaned. In particular, in the case of oral cleaning, by preventing the mist from flowing into the oral cavity, it can be used safely without choking. Furthermore, by forming the protruding portion 15 from an elastic material, the impact on the teeth and gums is weakened, and damage to the gums, oral mucosa, etc. can be prevented, so that the liquid ejection head 14 can be brought close to the cleaning part with peace of mind, making it easy to use.

[0036] As described above, the liquid ejecting head 14 and the oral cleaning device 100 of the present embodiment can provide the following effects. The liquid ejection head 14 comprises an ejection surface 11b having a plurality of ejection holes 3 formed therein for ejecting liquid, a plurality of suction ports 9b for sucking in the liquid ejected from the ejection holes 3, and a protrusion 15 protruding from the ejection surface 11b in the ejection direction of the liquid, and when the distance over which the liquid ejected from the ejection holes 3 turns into droplets is defined as droplet formation distance L1, the length L2 of the protrusion 15 is longer than the droplet formation distance L1.

[0037] In a preferred embodiment, the protrusion 15 is provided with a plurality of suction ports 9b at its tip and is made of a rectangular ring-shaped elastic member surrounding the nozzle group 43. Therefore, unlike conventional liquid injection devices in which the suction force of the suction tube causes the object to be sucked in when the liquid injection head 14 is in close contact with the object, resulting in a decrease in cleaning efficiency, the protrusion 15 made of an elastic member deforms even when the liquid injection head 14 is in close contact with the object, making it difficult for the entire surface to be sucked in, and the desired cleaning performance can be achieved. In detail, when cleaning the oral cavity, droplets 8b of the cleaning flow 8 collide with the teeth. When the droplets 8b collide with dirt attached or solidified to the teeth, the action of the impact pressure generated when the droplets collapse promotes the softening (emulsification) or destruction of the dirt, and the dirt can be efficiently cleaned. Furthermore, the suction port 9b at the tip of the protrusion 15 can efficiently suck in the liquid after cleaning. If the liquid remains around the teeth, the impact pressure will be attenuated, so by quickly sucking in the liquid, continuous cleaning performance can be achieved. Therefore, it is possible to provide the liquid ejecting head 14 that can be efficiently cleaned even when it is in close contact with an object.

[0038] Moreover, the protruding portion 15 is made of an elastic material and is formed so as to surround the multiple injection holes 3. According to this, even if the liquid ejection head 14 comes into close contact with the target object, the protruding portion 15 has elasticity, so that adhesion as occurs in the conventional liquid ejection device can be prevented.

[0039] The oral cleaning device 100 includes a liquid injection head 14, piping 17 as a first flow path for transporting liquid to multiple injection holes 3, and a holding portion 20 having piping 18 as a second flow path for recovering liquid sucked from multiple suction ports 9b installed therein, and cleans the oral cavity using droplets. This makes it possible to provide an oral cleaning device 100 that can efficiently clean an object even when in close contact with the object. [Explanation of symbols]

[0040] 3... injection hole, 5... through hole, 5b... suction port, 8... cleaning flow, 8a... continuous flow, 8b... droplets, 9... through hole, 9b... suction port, 10... liquid injection head, 11... case body, 11b... injection surface, 12... protrusion, 13... protrusion, 14... liquid injection head, 15... protrusion, 17... piping, 18... piping, 20... gripping portion, 21... connection portion, 22... operation portion, 23... electrical wiring, 25... cleaning unit, 30... control portion, 31... pump, 32... suction pump, 33... memory portion, 34... liquid tank, 35... waste liquid tank, 36... piping, 37... piping, 43... nozzle group, 50... main body device, 60... center line, 90... surface, 100... oral cleaning device, L1... droplet generation distance, L2... length, L5... length.

Claims

1. an ejection surface having a plurality of ejection holes for ejecting liquid; a plurality of suction ports that suck the liquid jetted from the jet hole; a protrusion protruding from the ejection surface in the ejection direction of the liquid, When a distance over which the liquid injected from the injection hole turns into droplets is defined as a droplet-forming distance, the length of the protrusion is longer than the droplet-forming distance. Liquid injection head.

2. The plurality of suction ports are provided at an end portion of the protrusion opposite to an end portion of the ejection surface side. The liquid jet head according to claim 1 .

3. The protrusion is formed of an elastic material. The liquid jet head according to claim 1 .

4. The protrusion is composed of a plurality of the elastic members. The liquid jet head according to claim 3 .

5. The protrusion is formed so as to surround the plurality of injection holes. The liquid jet head according to claim 3 .

6. The liquid jet head according to claim 2 , a gripping portion having a first flow path that transports the liquid to the plurality of injection holes and a second flow path that collects the liquid sucked from the plurality of suction ports, The droplets are used to rinse the oral cavity. Oral cleaning device.

7. a pressurizing unit that pressurizes the liquid and sends the liquid to the liquid ejection head; The oral cleaning device according to claim 6.

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