Liquid injection nozzle and device

Abstract

To provide a small liquid injection nozzle which can inject liquid at a strong collision pressure.SOLUTION: A liquid injection nozzle 1 comprises: a liquid feeding member 2 on which a channel 2 is formed, where liquid 3 circulates through the channel; a nozzle member 5 which injects the liquid 3 in a continuous flow 3a state, and has at least one nozzle hole 5 a for making the continuous flow 3a liquid droplets 3b; a first member 4 which has a circulation path 4a in which the liquid 3 can circulate, the first member being provided between the liquid feeding member 2 and the nozzle member 5 and having one end 4b inserted into the channel 2a of the liquid feeding member 2; a nozzle pressing member 6 for pressing the nozzle member 5 to the first member 4 for fixing the nozzle member; and a second member 7 which is fixed to the liquid feeding member 2 by pressing the liquid feeding member 2 from outside of the liquid feeding member 2 in a state in which the one end 4b is inserted into the channel 2a.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Conventionally, various liquid injection nozzles and liquid injection devices equipped with the liquid injection nozzles have been used. Among them, there is a liquid injection nozzle equipped with a liquid delivery member in which a flow path through which liquid flows is formed, and a nozzle member in which a nozzle hole is formed. For example, Patent Document 1 discloses a cleaning nozzle in which an inner metal fitting with a blocked tip is inserted into a hose tip, and the hose is fastened to the inner metal fitting from the hose outer periphery with a crimping metal fitting, and the hose tip is inserted into a hole in a base body with a hole in the center, and the base body and the hose tip are fixed with a solid agent, and further, a plurality of nozzle holes are passed through the crimping metal fitting, hose, and inner metal fitting from the outer periphery of the base body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-230190 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the cleaning nozzle disclosed in Patent Document 1 is capable of cleaning the inner surface of a pipe along the inner surface of the pipe having complex bends, but a cleaning nozzle for such a purpose needs to have a spherical base, which makes the base large relative to the hose and tends to be large. Also, it cannot be said that the configuration is capable of spraying liquid with sufficient collision pressure for use in applications other than cleaning the inner surface of the pipe. Thus, the conventional liquid spray nozzle disclosed in Patent Document 1 is not small and capable of spraying liquid with strong collision pressure. [Means for solving the problem]

[0005] The liquid injection nozzle of the present invention, which solves the above problems, is characterized in that it comprises a liquid delivery member having a flow path formed therethrough through which a liquid flows, a nozzle member having at least one nozzle hole formed therein for ejecting the liquid in a continuous flow and converting the continuous flow into droplets, a first member having a flow path through which the liquid can flow and being disposed between the liquid delivery member and the nozzle member, one end of which is inserted into the flow path of the liquid delivery member, a nozzle holding member which presses and fixes the nozzle member against the first member, and a second member which is fixed to the liquid delivery member by pressing the liquid delivery member from the outside of the liquid delivery member with one end inserted into the flow path. [Brief description of the drawings]

[0006] [Figure 1] FIG. 2 is a cross-sectional view showing the liquid ejection nozzle of the first embodiment. [Diagram 2] FIG. 6 is a cross-sectional view showing a liquid ejection nozzle according to a second embodiment. [Diagram 3] FIG. 11 is a cross-sectional view showing a liquid ejection nozzle according to a third embodiment. [Figure 4] FIG. 11 is a cross-sectional view showing a liquid injection nozzle according to a fourth embodiment. [Diagram 5] FIG. 11 is an exploded view showing a liquid injection nozzle according to a fourth embodiment. [Figure 6] 13 is a schematic diagram illustrating a liquid ejecting apparatus according to a fifth embodiment, which is an example of a liquid ejecting apparatus to which the liquid ejecting nozzles according to the first to fourth embodiments can be attached. FIG. [Figure 7] 13 is a schematic diagram illustrating a liquid ejecting apparatus according to a sixth embodiment, which is an example of a liquid ejecting apparatus to which the liquid ejecting nozzles according to the first to fourth embodiments can be attached. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] First, the present invention will be briefly described. In order to solve the above problem, a liquid injection nozzle of a first aspect of the present invention is characterized in that it comprises a liquid delivery member having a flow path formed therethrough through which a liquid flows, a nozzle member having at least one nozzle hole formed therein for ejecting the liquid in a continuous flow and converting the continuous flow into droplets, a first member having a flow path through which the liquid can flow and being disposed between the liquid delivery member and the nozzle member, one end of which is inserted into the flow path of the liquid delivery member, a nozzle pressing member which presses and fixes the nozzle member against the first member, and a second member which is fixed to the liquid delivery member by pressing the liquid delivery member from the outside of the liquid delivery member with the one end of which is inserted into the flow path.

[0008] According to this aspect, the liquid can be ejected as a continuous flow and can be made to collide with the target by forming the continuous flow into droplets. In this way, the liquid can be ejected as a continuous flow and can be made to collide with the target in the form of droplets, and the collision pressure of the liquid is dramatically improved compared to a configuration in which the liquid is simply ejected as a continuous flow and made to collide with the continuous flow. In addition, the liquid ejection nozzle can be made smaller by forming a configuration in which the liquid delivery member is fixed to the first member by pressing the second member from the outside of the liquid delivery member while one end of the first member to which the nozzle member is fixed by the nozzle pressing member is inserted into the flow path.

[0009] A second aspect of the liquid injection nozzle of the present invention is an aspect dependent on the first aspect, and is characterized in that it has an injection tip portion spaced a first distance from the nozzle hole in the injection direction of the liquid, and the first distance is longer than a dropletization distance over which the continuous flow injected from the nozzle hole is converted into droplets.

[0010] According to this aspect, the first distance from the nozzle hole to the ejection tip is longer than the dropletization distance. That is, the liquid is in a dropletized state when ejected from the ejection tip. Therefore, even when the ejection tip is brought close to the target, it is possible to prevent the liquid from colliding with the target in a continuous flow state before it is broken down into droplets. Therefore, even when the ejection tip is brought close to the target, it is possible to cause the liquid to collide with the target with a strong collision pressure.

[0011] A third aspect of the liquid injection nozzle of the present invention is an aspect dependent on the first or second aspect, and is characterized in that the second member is partially embedded in the liquid delivery member at a position facing the first member via the liquid delivery member.

[0012] According to this aspect, the second member is in a state where a part of the second member is bitten into the liquid delivery member at a position facing the first member with the liquid delivery member interposed therebetween. With this configuration, it is possible to prevent the second member from coming off the liquid delivery member.

[0013] A fourth aspect of the liquid injection nozzle of the present invention is an aspect dependent on the third aspect, and is characterized in that at a position where the second member faces the first member via the liquid delivery member, a female thread portion is provided on the second member, and a male thread portion that engages with the female thread portion is provided on the liquid delivery member.

[0014] According to this aspect, the second member is provided with a female screw portion at a position where the second member faces the first member via the liquid delivery member, and the liquid delivery member is provided with a male screw portion that fits with the female screw portion. With this configuration, it is possible to particularly effectively prevent the second member from coming off the liquid delivery member.

[0015] A fifth aspect of the liquid injection nozzle of the present invention is an aspect dependent on the first or second aspect, and is characterized in that the first member is partially embedded in the liquid delivery member at a position facing the second member via the liquid delivery member.

[0016] According to this aspect, the first member is partially embedded in the liquid delivery member at a position facing the second member with the liquid delivery member interposed therebetween. With this configuration, it is possible to prevent the first member from coming off the liquid delivery member.

[0017] A sixth aspect of the liquid injection nozzle of the present invention is an aspect dependent on the first or second aspect, and is characterized in that at a position where the first member and the second member face each other and contact each other, a female thread portion is provided on the second member, and a male thread portion that engages with the female thread portion is provided on the first member.

[0018] According to this aspect, at a position where the first member and the second member face each other and come into contact with each other, the second member is provided with a female thread portion, and the first member is provided with a male thread portion that fits with the female thread portion. With this configuration, it is possible to particularly effectively prevent the second member from coming off the first member.

[0019] A seventh aspect of the liquid injection nozzle of the present invention is an aspect dependent on the first or second aspect, and is characterized in that the first member and the nozzle holding member have an opposing region where they face each other, the first member has a female thread portion in the opposing region, and the nozzle holding member has a male thread portion in the opposing region that engages with the female thread portion.

[0020] According to this aspect, the first member has a female screw portion provided in the facing region, and the nozzle holding member has a male screw portion that fits with the female screw portion provided in the facing region. With this configuration, it is possible to effectively prevent the nozzle holding member from coming off the liquid ejection nozzle, and it is possible to effectively prevent the nozzle member from being unable to be pressed and fixed to the first member due to the nozzle holding member coming off.

[0021] The liquid injection nozzle of an eighth aspect of the present invention is an aspect dependent on the first or second aspect, and is characterized in that the first member has a taper at the one end which narrows toward the tip so that the flow path widens.

[0022] According to this aspect, the first member has a taper at one end such that the flow path widens toward the tip. When liquid flows from the liquid delivery member to the flow path of the first member, turbulence is likely to occur around the one end of the first member due to the step between the liquid delivery member and the one end of the first member, and the occurrence of turbulence may cause a decrease in the flow rate of the liquid. However, by providing a taper at one end of the first member in this configuration, the step between the liquid delivery member and the one end of the first member can be reduced, and the decrease in the flow rate of the liquid can be suppressed.

[0023] A ninth aspect of the liquid jet nozzle of the present invention is an aspect dependent on the first or second aspect, and is characterized in that the second member is configured to cover the outside of the nozzle pressing member.

[0024] According to this aspect, the second member is configured to cover the outside of the nozzle holder member. With this configuration, it is possible to easily prevent the nozzle holder member from coming off the liquid ejection nozzle, and to easily prevent the nozzle holder member from coming off and being unable to press and fix the nozzle member to the first member.

[0025] A liquid ejection device according to a tenth aspect of the present invention includes a liquid ejection nozzle according to any of the first and second aspects, and a pump connected to the liquid ejection nozzle.

[0026] According to this aspect, the liquid ejection nozzle includes a pump connected to the liquid ejection nozzle, and this configuration makes it possible to suitably deliver liquid to the nozzle member of the liquid ejection nozzle and to eject the liquid with a strong ejection pressure.

[0027] A liquid injection device according to an eleventh aspect of the present invention is characterized in that it comprises a liquid injection nozzle according to an aspect dependent on the first or second aspect, a syringe connected to the liquid injection nozzle, and a piston that moves the syringe.

[0028] According to this aspect, the liquid ejection nozzle includes a syringe connected to the liquid ejection nozzle and a piston that moves the syringe, and therefore the liquid can be suitably delivered to the nozzle member of the liquid ejection nozzle with a simple configuration.

[0029] [Example 1] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. The liquid jet nozzle 1 of the present invention is capable of jetting a liquid 3 in a continuous flow 3a, converting the continuous flow 3a into droplets 3b, and colliding the liquid 3 in the form of droplets 3b against an object. First, a liquid jet nozzle 1A of Example 1, which is an example of the liquid jet nozzle 1 of the present invention, will be described with reference to FIG.

[0030] The liquid ejection nozzle 1A of this embodiment shown in Fig. 1 includes a liquid delivery member 2, which is, for example, a resin tube, having a flow path 2a through which the liquid 3 flows, and a nozzle member 5 having at least one nozzle hole 5a for ejecting the liquid 3 as a continuous flow 3a and turning the continuous flow 3a into droplets 3b. As shown in Fig. 1, the liquid ejection nozzle 1A of this embodiment includes a first member 4 having a flow path 4a through which the liquid 3 can flow, disposed between the liquid delivery member 2 and the nozzle member 5, and one end 4b being inserted into the flow path 2a of the liquid delivery member 2 by being pressed into the liquid delivery member 2. Furthermore, the liquid ejection nozzle 1A of this embodiment includes a nozzle pressing member 6 for pressing the nozzle member 5a against the first member 4 to fix it, and a second member 7 for pressing the liquid delivery member 2 from the outside of the liquid delivery member 2 with the one end 4b inserted into the flow path 2a.

[0031] Like the liquid injection nozzle 1A of this embodiment, by injecting the liquid 3 as a continuous stream 3a and converting the continuous stream 3a into droplets 3b that collide with an object in the form of droplets 3b, the collision pressure of the liquid 3 is dramatically improved compared to a configuration in which the liquid 3 is simply injected as a continuous stream 3a and collided as the continuous stream 3a. Also, like the liquid injection nozzle 1A of this embodiment, by adopting a configuration in which the first member 4 to which the nozzle member 5 is fixed by the nozzle holding member 6 is fixed to the liquid delivery member 2 by pressing the liquid delivery member 2 from the outside of the liquid delivery member 2 with the second member 7, while one end 4b of the first member 4 to which the nozzle member 5 is fixed by the nozzle holding member 6 is inserted into the flow path 2a, the liquid injection nozzle 1 can be made smaller.

[0032] In addition, by using the liquid injection nozzle 1A of this embodiment, it is possible to efficiently clean the inner wall of a container that is long in the vertical direction, such as a bottle or jar with a narrow mouth, such as a baby bottle. In general, when cleaning a container that is long in the vertical direction, the distance from the nozzle member 5 to the object to be cleaned on which the droplets 3b land is long, so there is a risk that the spray speed of the droplets 3b will attenuate and the impact pressure will decrease, resulting in a decrease in cleaning power. However, by using a small liquid injection nozzle 1 such as the liquid injection nozzle 1A of this embodiment, it is possible to collide the droplets 3b with the object to be cleaned while appropriately adjusting the landing distance, and it is possible to suppress the decrease in cleaning power that may occur due to the structure of the liquid injection nozzle 1.

[0033] In the liquid jet nozzle 1A of this embodiment, the liquid delivery member 2 is a tube made of resin such as polyamide synthetic resin or polyether ether ketone resin. The liquid delivery member 2 preferably has a pressure resistance of 10 MPa or more and 20 MPa or less, an outer diameter of 1 mm or more, and an inner diameter of 0.5 mm or more. In the liquid jet nozzle 1A of this embodiment, the nozzle holding member 6 is a rigid member made of metal and has a circular ring shape in which a hole 6a that forms a flow path for the liquid 3 is formed. However, there is no particular limitation on the configuration of the liquid delivery member 2 and the nozzle holding member 6.

[0034] In the liquid injection nozzle 1A of this embodiment, the first member 4 and the second member 7 are made of metal, but there is no particular limitation on the material and shape of the first member 4 and the second member 7. Furthermore, in the liquid injection nozzle 1A of this embodiment, the nozzle member 5 is a disk-shaped component member made of a metal such as stainless steel or nickel having a high tensile strength, and one or more nozzle holes 5a having a diameter of φ0.01 to 0.15 mm are formed, but there is no particular limitation on the material and shape of the nozzle member 5, and the shape and number of the nozzle holes 5a. Here, when the diameter of the hole portion 6a of the nozzle pressing member 6 is φ0.5 mm, the nozzle holes 5a are formed at a pitch in which the nozzle holes 5a are arranged in a range of 10 times or more the diameter of the nozzle hole 5a or less than 0.2 mm, and the number of holes that can be arranged according to the nozzle hole diameter 5a is provided. The thickness of the nozzle member 5 can be, for example, in the range of 0.05 mm to 0.5 mm, and the nozzle hole 5a can be formed by a method selected from drilling, etching, punching, etc. By forming it in this manner, a small liquid injection nozzle 1 can be produced.

[0035] Here, the flow path 4a of the first member 4 is preferably 10 to 50 times the diameter of the nozzle hole 5a, and more preferably 10 to 20 times the diameter of the nozzle hole 5a. In addition, the thickness of the second member 7 at the position R1 where the liquid delivery member 2 is pressed is preferably 0.8 to 1.2 times the thickness of the liquid delivery member 2. Furthermore, in order to prevent the liquid injection nozzle 1 from becoming too large, the outer diameter of the second member 7 at the position R1 where the liquid delivery member 2 is pressed is preferably 1.4 times or less the outer diameter of the liquid delivery member 2. In addition, the second member 7 is formed with a hole portion 7b that is connected to the nozzle hole 5a of the nozzle member 5 and the hole portion 6a of the nozzle pressing member 6, but there is no particular limitation on the diameter of the hole portion 7b. However, the diameter of the hole portion 7b is preferably larger than the diameter of the nozzle hole 5a.

[0036] 1, in the liquid jet nozzle 1A of this embodiment, the distance from the nozzle hole 5a to the tip of the liquid jet nozzle 1A in the jetting direction A of the liquid 3 corresponds to the distance from the nozzle hole 5a to the tip of the second member 7 in the jetting direction A of the liquid 3. In other words, the liquid jet nozzle 1A of this embodiment has the jet tip portion 7a spaced apart from the nozzle hole 5a by a first distance L1 in the jetting direction A of the liquid 3. As described above, the liquid jet nozzle 1A of this embodiment is capable of jetting the liquid 3 in a continuous stream 3a, turning the continuous stream 3a into droplets 3b, and colliding the liquid 3 against the cleaning target 4 in the state of droplets 3b, but as shown in FIG. 1, the first distance L1 is configured to be longer than the droplet distance L2 until the continuous stream 3a jetted from the nozzle hole 5a turns into droplets 3b.

[0037] Because the liquid jet nozzle 1A of this embodiment has such a configuration, even when the jet tip 7a is brought close to the target, it is possible to prevent the liquid 3 from colliding with the target in the state of a continuous flow 3a, which is a state before it turns into droplets 3b. Therefore, even when the jet tip 7a is brought close to the target, the liquid jet nozzle 1A of this embodiment can collide the liquid 3 with the target in the state of droplets 3b, not in the state of a continuous flow 3a, and can collide the liquid 3 with the target with a strong collision pressure.

[0038] 1, in the liquid jet nozzle 1A of this embodiment, the second member 7 is configured to cover the outside of the nozzle holding member 6 in the jetting direction A and in the circumferential direction intersecting with the jetting direction A. By configuring the liquid jet nozzle 1A of this embodiment in this way, it is possible to easily prevent the nozzle holding member 6 from coming off the liquid jet nozzle 1A, and to easily prevent the nozzle holding member 6 from coming off and being unable to press and fix the nozzle member 5 against the first member 4.

[0039] As shown in FIG. 1, in the liquid injection nozzle 1A of this embodiment, the second member 7 is fixed to the liquid delivery member 2 by applying a force from the outside and crimping the second member 7, so that a convex portion that bites into the liquid delivery member 2 is generated in a part 7c of the second member 7. In other words, in the liquid injection nozzle 1A of this embodiment, the second member 7 is in a state where a part 7c bites into the liquid delivery member 2 at a position R1 facing the first member 4 through the liquid delivery member 2. By adopting such a configuration, it is possible to prevent the second member 7 from coming off the liquid delivery member 2. Note that the state where the part 7c bites into the liquid delivery member 2 means a structure in which the part 7c of the second member 7 penetrates into the liquid delivery member 2 in the cross-sectional shape as shown in FIG. 1, and in addition to a structure in which the second member 7 is made to bite into the liquid delivery member 2 by crimping or the like as in this embodiment, a structure in which a spiral thread groove or other unevenness is provided in advance in the second member 7 and the liquid delivery member 2 and the unevenness of both are fitted together may be used.

[0040] 1, in the liquid injection nozzle 1A of this embodiment, an unevenness 4c is formed at a position where the second member 7 of the first member 4 is crimped, that is, at a position R1 where the second member 7 of the first member 4 faces the first member 4. Therefore, in the liquid injection nozzle 1A of this embodiment, the first member 4 is easily fitted into the liquid delivery member 2 and is difficult to come off.

[0041] In other words, in the liquid injection nozzle 1A of this embodiment, at the position R1 where the first member 4 faces the second member 7 through the liquid delivery member 2, where the unevenness 4c is formed, the liquid delivery member 2 is partially inserted into the recess of the unevenness 4c, so that the first member 4 is partially embedded in the liquid delivery member 2. With this configuration, it is possible to prevent the first member 4 from coming off the liquid delivery member 2. Note that the state where the first member 4 is partially embedded in the liquid delivery member 2 means that the cross-sectional shape of the liquid delivery member 2 is a structure in which a part of the liquid delivery member 2 has entered the inside of the first member 4. For example, as a configuration other than this embodiment, a structure in which unevenness such as a spiral screw groove is provided in advance in the first member 4 and the liquid delivery member 2 and the unevenness of both are fitted together may be used.

[0042] [Example 2] The liquid injection nozzle 1B of the second embodiment will be described below with reference to FIG. 2. FIG. 2 is a diagram corresponding to FIG. 1 showing the liquid injection nozzle 1A of the first embodiment. The liquid injection nozzle 1B of the present embodiment is similar to the liquid injection nozzle 1A of the first embodiment except for the configuration described below. Therefore, the liquid injection nozzle 1B of the present embodiment has the same characteristics as the liquid injection nozzle 1A of the first embodiment except for the points described below. Therefore, in FIG. 2, components common to the first embodiment are indicated by the same reference numerals, and detailed descriptions thereof will be omitted.

[0043] 2, in the liquid jet nozzle 1B of this embodiment, the first member 4 is provided at one end 4b with a taper 4d that tapers toward the tip, or in other words, toward the opposite direction to the jet direction A, so that the flow path 4a widens. When the liquid 3 flows from the liquid delivery member 2 to the flow path 4a of the first member 4, turbulence is likely to occur around the one end 4b of the first member 4 due to the step between the liquid delivery member 2 and the one end 4b of the first member 4, and the occurrence of turbulence may cause a decrease in the flow rate of the liquid 3. However, by providing the taper 4d at the one end 4b of the first member 4 as in the liquid jet nozzle 1B of this embodiment, the step between the liquid delivery member 2 and the one end 4b of the first member 4 can be reduced, and the decrease in the flow rate of the liquid 3 can be suppressed.

[0044] In the liquid injection nozzle 1B of this embodiment, the angle Θ of the taper 4d with respect to the flow path 2a is approximately 30°. There is no particular limitation to this angle, but in order to effectively exert the effect of suppressing turbulence or to prevent the cross-sectional area of ​​the flow path for the liquid 3 from suddenly becoming small, it is preferable that the angle be 30° or less.

[0045] [Example 3] The liquid injection nozzle 1C of the third embodiment will be described below with reference to FIG. 3. FIG. 3 is a diagram corresponding to FIG. 1 showing the liquid injection nozzle 1A of the first embodiment. The liquid injection nozzle 1C of the present embodiment is similar to the liquid injection nozzle 1A of the first embodiment except for the configuration described below. Therefore, the liquid injection nozzle 1C of the present embodiment has the same characteristics as the liquid injection nozzle 1A of the first embodiment except for the points described below. Therefore, in FIG. 3, components common to the first and second embodiments are indicated by the same reference numerals, and detailed descriptions thereof will be omitted.

[0046] 3, in the liquid jet nozzle 1C of this embodiment, at a position R1 where the second member 7 faces the first member 4 via the liquid delivery member 2, a female screw portion 8B is provided on the second member 7, and a male screw portion 8A that fits with the female screw portion 8B is provided on the liquid delivery member 2. With this configuration, it is possible to particularly effectively prevent the second member 7 from coming off the liquid delivery member 2.

[0047] 3, in the liquid jet nozzle 1C of this embodiment, the first member 4 has a facing region R3 facing the nozzle holding member 6, the first member 4 is provided with a female screw portion 8D in the facing region R3, and the nozzle holding member 6 is provided with a male screw portion 8C that fits with the female screw portion 8D in the facing region R3. With this configuration, it is possible to effectively prevent the nozzle holding member 6 from coming off the liquid jet nozzle 1, and it is possible to effectively prevent the nozzle holding member 6 from coming off and being unable to press and fix the nozzle member 5 against the first member 4.

[0048] 3, in the liquid injection nozzle 1C of this embodiment, at a position R2 where the first member 4 and the second member 7 face each other and come into contact with each other, a female screw portion 8F is provided on the second member 7, and a male screw portion 8E that fits with the female screw portion 8F is provided on the first member 4. With this configuration, it is possible to particularly effectively prevent the second member 7 from coming off the first member 4.

[0049] In addition, when assembling the liquid injection nozzle 1C of this embodiment, the nozzle member 5 is first set, and then the female screw portion 8D and the male screw portion 8C are fitted together to fix the first member 4 and the nozzle pressing member 6, then the female screw portion 8F and the male screw portion 8E are fitted together to fix the first member 4 and the second member 7, and finally the female screw portion 8B and the male screw portion 8A are fitted together to fix the second member 7 and the liquid delivery member 2. Note that the screw fixing portion 8 for fixing the female screw portion and the male screw portion by fitting them together is not limited to the position and number as in the liquid injection nozzle 1C of this embodiment. For example, the male screw portion 8A and the female screw portion 8B, as well as the male screw portion 8C and the female screw portion 8D may be omitted, and only the female screw portion 8F of the second member 7 and the male screw portion 8E of the first member 4 may be provided as the screw fixing portion 8. If such a screw fixing portion 8 is provided, any of the components of the liquid injection nozzle 1 will not easily come off.

[0050] [Example 4] A liquid injection nozzle 1D of Example 4 will be described below with reference to Figures 4 and 5. Figure 4 is a view corresponding to Figure 1 showing the liquid injection nozzle 1A of Example 1. The liquid injection nozzle 1D of this example is similar to the liquid injection nozzle 1 of Examples 1 to 3 except for the configuration described below. Therefore, the liquid injection nozzle 1D of this example has similar features to the liquid injection nozzle 1 of Examples 1 to 3 except for the points described below. Therefore, in Figures 4 and 5, components common to Examples 1 to 3 are indicated by the same reference numerals, and detailed descriptions will be omitted.

[0051] 4 and 5, the liquid jet nozzle 1D of this embodiment differs from the liquid jet nozzle 1 of Examples 1 to 3 in the shapes of each component member other than the liquid delivery member 2 and the nozzle member 5. Specifically, the liquid jet nozzle 1D of this embodiment includes a liquid delivery member 2 having a configuration similar to that of the liquid delivery member 2 of the liquid jet nozzle 1 of Examples 1 and 2, and a nozzle member 5 having a configuration similar to that of the nozzle member 5 of the liquid jet nozzle 1 of Examples 1 to 3. The liquid jet nozzle 1D of this embodiment also includes a first member 4 and a second member 7 which are male-threaded joint members having a male thread portion 8I and inserted into the inner diameter portion of the liquid delivery member 2, and a nozzle pressing member 6 which is a pressure retaining structure having a female thread portion 8J which fits with the male thread portion 8I.

[0052] In the liquid jet nozzle 1D of this embodiment, a hard tube made of polyamide synthetic resin, polyether ether ketone resin, or the like, which is the liquid delivery member 2, is passed through a second member 7 which is a joint member, and a first member 4 which is a tube nipple which is a joint member is press-fitted into a flow path 2a which is an inner diameter portion of the liquid delivery member 2. As shown in Fig. 4 and Fig. 5, in the liquid jet nozzle 1D of this embodiment, one end 4b of the first member 4 is formed with a slope portion 4e which becomes thinner toward the tip so that the first member 4 can be easily press-fitted into the liquid delivery member 2.

[0053] 5, the first member 4 is provided with a male screw portion 8G, and the second member 7 is provided with a female screw portion 8H that fits with the male screw portion 8G. After the first member 4 is press-fitted into the liquid delivery member 2, the second member 7 is tightened to the first member 4. In addition, the nozzle member 5 is installed in the installation portion 6b provided in the nozzle pressing member 6, and then the nozzle pressing member 6 is turned relative to the male screw portion 8I of the first member 4 to tighten the female screw portion 8J, thereby forming the liquid injection nozzle 1D of this embodiment.

[0054] With such a configuration, the nozzle member 5 in which the nozzle hole 5a is formed can be easily attached, detached, and replaced, and the nozzle member 5 can be easily washed and replaced with a nozzle member 5 in which the nozzle hole 5a having a different nozzle diameter, nozzle number, or nozzle hole shape is formed. In addition, it is possible to provide a large number of inexpensive liquid injection nozzles 1, and the liquid injection nozzle 1 can be used as a disposable part in a wide range of areas such as industrial and consumer applications. Furthermore, the liquid injection nozzle 1D can be applied to medical applications by making each component applicable to medical applications, such as by making the material of each component applicable to sterilization. The liquid injection nozzle 1D of this embodiment is configured to be able to inject liquid at a maximum of about 10 MPa.

[0055] 4, in the liquid jet nozzle 1D of this embodiment, the first distance, which is the distance from the nozzle hole 5a to the tip of the nozzle holding member 6 in the jetting direction A of the liquid 3, is shorter than the dropletization distance until the continuous stream 3a jetted from the nozzle hole 5a turns into droplets 3b. However, it is more preferable to configure the first distance longer than the dropletization distance until the continuous stream 3a jetted from the nozzle hole 5a turns into droplets 3b, for example, by configuring the nozzle holding member 6 as shown by the dashed line in FIG. 4 to make the hole 6a of the nozzle holding member 6 longer.

[0056] [Example 5] Hereinafter, a liquid injection device 10A will be described as Example 5, which is an example of the liquid injection device 10 to which the liquid injection nozzle 1 of Examples 1 to 4 can be attached. Fig. 6 is a schematic diagram showing the liquid injection device 10A of this example to which the liquid injection nozzle 1 of Examples 1 to 4 can be attached. Since the liquid injection device 10A of this example can be attached to the liquid injection nozzle 1 of Examples 1 to 4, in Fig. 6, components common to the above-mentioned Examples 1 to 4 are indicated by the same reference numerals, and detailed description thereof will be omitted.

[0057] 6, the liquid injection device 10A of this embodiment includes the liquid injection nozzle 1 of any one of the first to fourth embodiments, and a pump 11 connected to the liquid injection nozzle 1. With this configuration, the liquid 3 can be suitably sent to the nozzle member 5 of the liquid injection nozzle 1, and the liquid 3 can be injected with a strong injection pressure.

[0058] [Example 6] Hereinafter, a liquid injection device 10B as Example 6, which is an example of the liquid injection device 10 to which the liquid injection nozzle 1 of Examples 1 to 4 can be attached, will be described. Fig. 7 is a schematic diagram showing the liquid injection device 10B of this example to which the liquid injection nozzle 1 of Examples 1 to 4 can be attached. Since the liquid injection device 10B of this example can be attached to the liquid injection nozzle 1 of Examples 1 to 4, in Fig. 7, components common to the above-mentioned Examples 1 to 4 are indicated by the same reference numerals, and detailed description thereof will be omitted.

[0059] 7, the liquid injection device 10B of this embodiment includes the liquid injection nozzle 1 of any one of the embodiments 1 to 4, a syringe 13 connected to the liquid injection nozzle 1, and a piston 14 for moving the syringe 13. The syringe 13 connected to the liquid injection nozzle 1 and the piston 14 for moving the syringe 13 form a push-out mechanism 12 for pushing out the liquid 3 stored inside the syringe 13 toward the liquid injection nozzle 1. The push-out mechanism 12 consisting of the syringe 13 and the piston 14 has a simple configuration that can be used disposably, so the liquid injection device 10B of this embodiment can suitably send the liquid 3 to the nozzle member 5 of the liquid injection nozzle 1 while having a simple configuration.

[0060] The present invention is not limited to the above-mentioned embodiments, and can be realized in various configurations without departing from the spirit of the present invention. The technical features in the embodiments corresponding to the technical features in each aspect described in the Summary of the Invention can be appropriately replaced or combined in order to solve some or all of the above-mentioned problems or to achieve some or all of the above-mentioned effects. Furthermore, if a technical feature is not described as essential in this specification, it can be appropriately deleted. [Explanation of symbols]

[0061] 1...liquid injection nozzle, 1A...liquid injection nozzle, 1B...liquid injection nozzle, 1C...liquid injection nozzle, 1D...liquid injection nozzle, 2...liquid delivery member, 2a...flow path, 3...liquid, 3a...continuous flow, 3b...liquid droplet, 4...first member, 4a...flow path, 4b...one end, 4c...irregularities, 4d...taper, 4e...inclined portion, 5...nozzle member, 5a...nozzle hole, 6...nozzle holding member, 6a...hole portion, 6b...installation portion, 7...second member, 7a...injection tip portion, 7b...hole portion, 7c...part, 8...screw fixing portion, 8A...male thread portion, 8B...female thread portion, 8C...male thread portion, 8D...female thread portion, 8E...male thread portion, 8F...female thread portion, 8G...male thread portion, 8H...female thread portion, 8I...male thread portion, 8J...female thread portion, 10...liquid injection device, 10A...liquid injection device, 10B...liquid injection device, 11...pump, 12...extrusion mechanism, 13...syringe, 14...piston, R1...position, R2...position, R3...opposing area

Claims

1. A liquid delivery member having a flow path through which a liquid flows; a nozzle member having at least one nozzle hole formed therein for ejecting the liquid in a continuous stream and turning the continuous stream into droplets; a first member having a flow path through which the liquid can flow, the first member being disposed between the liquid delivery member and the nozzle member, and one end of the first member being inserted into the flow path of the liquid delivery member; a nozzle pressing member that presses and fixes the nozzle member against the first member; a second member that is fixed to the liquid delivery member by pressing the liquid delivery member from outside the liquid delivery member with the one end of the second member inserted into the flow channel; A liquid injection nozzle comprising:

2. The liquid injection nozzle according to claim 1, a nozzle hole having a nozzle tip spaced a first distance from the nozzle hole in a direction in which the liquid is ejected; The liquid ejection nozzle according to claim 1, wherein the first distance is longer than a distance over which the continuous flow ejected from the nozzle hole is ejected into droplets.

3. The liquid injection nozzle according to claim 1 or 2, The liquid ejection nozzle according to claim 1, wherein the second member is partly embedded in the liquid delivery member at a position facing the first member with the liquid delivery member interposed therebetween.

4. The liquid injection nozzle according to claim 3, A liquid injection nozzle characterized in that at a position where the second member faces the first member via the liquid delivery member, a female thread portion is provided on the second member, and a male thread portion that engages with the female thread portion is provided on the liquid delivery member.

5. The liquid injection nozzle according to claim 1 or 2, The liquid ejection nozzle according to claim 1, wherein the first member is partly embedded in the liquid delivery member at a position facing the second member with the liquid delivery member interposed therebetween.

6. The liquid injection nozzle according to claim 1 or 2, A liquid injection nozzle characterized in that at a position where the first member and the second member face each other and contact each other, a female thread portion is provided on the second member, and a male thread portion that engages with the female thread portion is provided on the first member.

7. The liquid injection nozzle according to claim 1 or 2, the first member has a facing region facing the nozzle pressing member, The first member has a female screw portion provided in the facing region, The liquid ejection nozzle according to claim 1, wherein the nozzle pressing member is provided with a male thread portion in the opposing region, the male thread portion being fitted into the female thread portion.

8. The liquid injection nozzle according to claim 1 or 2, The liquid injection nozzle according to claim 1, wherein the first member has a taper at the one end such that the flow path widens toward a tip.

9. The liquid injection nozzle according to claim 1 or 2, The liquid ejection nozzle according to claim 1, wherein the second member is configured to cover an outer side of the nozzle pressing member.

10. The liquid injection nozzle according to claim 1 or 2, A pump connected to the liquid injection nozzle; A liquid ejection apparatus comprising:

11. The liquid injection nozzle according to claim 1 or 2, A syringe connected to the liquid injection nozzle; A piston that moves the syringe; A liquid ejection apparatus comprising:

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