Fluid injection device and its control method

Abstract

The present invention provides a fluid injection device capable of spraying a non-viscous fluid as droplets. [Solution] A fluid injection device (1) for injecting a non-viscous fluid (water), comprising a tubular nozzle (11b) having a nozzle (11c) at its tip, and a vibrating part (20) for vibrating the nozzle (11b), characterized in that the vibrating part (20) vibrates the nozzle (11b) in a direction intersecting the axial direction (central axis C) of the nozzle (11b), thereby generating droplets (WD) from the columnar non-viscous fluid (water) injected from the nozzle (11c).

Description

Technical Field

[0001] The present invention relates to a fluid injection device and a control method thereof.

Background Art

[0002] As a conventional technique in this technical field, for example, Patent Document 1 describes a washer nozzle (fluid injection device) configured by providing an injection port between an inlet and an outlet of an injection part, connecting the inlet of the injection part and the injection port with an internal guide, and connecting the injection port of the injection part and the outlet with an external guide. According to this washer nozzle, the fluid oscillated in the oscillation chamber is guided to the injection port by the internal guide, and the fluid passing through the injection port is guided to the external guide on the opposite side. Thereby, it is said that the fluid can be stably injected even when the injection angle is large or the injection direction is inclined.

Prior Art Documents

Patent Documents

[0003]

Patent Document Ⅰ

Summary of the Invention

Problems to be Solved by the Invention

[0004] The washer nozzle described in Patent Document 1 is intended to stably inject fluid within a desired range, and does not mention anything about injecting a non-viscous fluid as droplets.

[0005] An object of the present invention is to provide a fluid injection device capable of injecting a non-viscous fluid as droplets, a method for generating droplets using the same, and a fluid injection system using the same.

Means for Solving the Problems

[0006] To achieve the above objective, a first aspect of the present invention is a fluid injection device for injecting a non-viscous fluid, comprising a tubular nozzle having a nozzle at its tip, and a vibrating unit for vibrating the nozzle, wherein the vibrating unit vibrates the nozzle in a direction intersecting the axial direction of the nozzle, thereby injecting the columnar non-viscous fluid ejected from the nozzle. However, it splits while being shaken in the direction of the nozzle's movement. It is characterized by generating droplets.

[0007] To achieve the above objective, a second aspect of the present invention is a method for generating droplets using a fluid injection device according to the first aspect described above, the method comprising: a first step of supplying the non-viscous fluid to the nozzle; a second step of vibrating the nozzle with the vibrating part in a direction intersecting the axial direction of the nozzle; a third step of ejecting the non-viscous fluid in a columnar form from the nozzle; and a fourth step of generating droplets from the ejected columnar non-viscous fluid.

[0008] To achieve the above objective, a third aspect of the present invention is a fluid injection system comprising an object having a confined space and a fluid injection device according to the first aspect described above, characterized in that the nozzle opening of the nozzle is positioned within the confined space, at the entrance to the confined space, or near the entrance to the confined space, and the vibrating part vibrates the nozzle, causing the droplets to collide with a specific area within the confined space. [Effects of the Invention]

[0009] According to the present invention, a non-viscous fluid can be ejected as a droplet. Other problems, configurations, and effects will be clarified by the following description of embodiments. [Brief explanation of the drawing]

[0010] [Figure 1] This is a longitudinal cross-sectional view showing the overall configuration of the fluid injection device according to this embodiment. [Figure 2] (a) is a magnified longitudinal cross-sectional view of the tip of the outer cylinder, and (b) is a view of the tip of the outer cylinder from the axial tip side. [Figure 3](a) is a diagram of the vibrating section, and (b) is a view of the rotor from the tip side. [Figure 4] This figure shows the relationship between L' / L and amplitude An. [Figure 5] This is a schematic diagram illustrating how a column of liquid water changes into droplets. [Figure 6] This is a schematic diagram illustrating how droplets change when the amplitude of the tubular cavity is large. [Figure 7] This is a schematic diagram illustrating how a liquid droplet changes when the amplitude of the tubular cavity is small. [Figure 8] This is a conceptual diagram showing the characteristic change in the maximum droplet diameter Dmax with respect to frequency f. [Figure 9] This is a model diagram showing how a liquid column ejected from a nozzle changes into droplets when the frequency f is extremely small. [Figure 10] This is a model diagram showing how a liquid column ejected from a nozzle changes into droplets when the frequency f is very large. [Figure 11] This figure shows the change in the distance δ between main droplets and the durability life Lt of the nozzle body with respect to amplitude An. [Figure 12] (a) is a partial cross-sectional view of the CO2 methanation reactor cut along the axial direction, and (b) is a cross-sectional view of the CO2 methanation reactor 40 cut along a direction perpendicular to the axial direction. [Figure 13] This is a cross-sectional view showing an example of a confined space. [Modes for carrying out the invention]

[0011] Hereinafter, embodiments of the fluid injection device according to the present invention will be described with reference to the drawings.

[0012] In this embodiment, the fluid to be used is not limited to a non-viscous fluid. Specifically, water, sulfuric acid, hydrochloric acid, caustic soda, etc. can be used and can be appropriately selected according to the purpose of use. For example, if the purpose of use is cooling, water can be used as the non-viscous fluid. Also, if the purpose of use is lipid removal, caustic soda can be used as the non-viscous fluid. On the other hand, in this embodiment, it is difficult to use a fluid with high viscosity. Therefore, for example, it is hard to say that a highly viscous fluid such as glycerin is suitable for use. Hereinafter, an embodiment using water as an example of a non-viscous fluid will be described.

[0013] FIG. 1 is a longitudinal sectional view showing the overall configuration of the fluid injection device 1 according to this embodiment. As shown in FIG. 1, the fluid injection device 1 includes a nozzle portion 10, a vibration portion 20, and a control portion 30.

[0014] The nozzle portion 10 includes a nozzle main body 11, a nozzle support 13, and an outer cylinder 15. The nozzle main body 11 is made of, for example, stainless steel and includes a head 11a, a thin tube 11b, and a nozzle 11c.

[0015] The head 11a is formed in a funnel shape and temporarily stores the water (non-viscous fluid) flowing in the direction of arrow A.

[0016] The thin tube 11b has a flow path formed therein through which water flows and extends in the axial direction (the direction of the central axis C) with a predetermined length L. The length L of the thin tube 11b is, for example, about 100 mm. The thin tube 11b communicates with the bottom of the head 11a (the downstream side in the water flow direction) and guides the water supplied to the head 11a to the nozzle 11c. The thin tube 11b has an inner diameter of, for example, about 1 mm. The water flowing through the thin tube 11b is ejected from the nozzle 11c.

[0017] The nozzle support 13 is made of, for example, stainless steel and engages with the upper part of the head 11a (the upstream end in the water flow direction) to support the head 11a.

[0018] The outer cylinder 15 is formed in a cylindrical shape and houses the nozzle body 11 and the vibrating part 20 inside. The outer cylinder 15 is made of, for example, stainless steel.

[0019] Figure 2(a) is an enlarged longitudinal cross-sectional view of the tip of the outer cylinder 15, and Figure 2(b) is a view of the tip of the outer cylinder 15 from the axial tip side.

[0020] As shown in Figures 2(a) and (b), a membrane 17 is provided at the tip of the outer cylinder 15. More specifically, the membrane 17 is provided to close the annular gap 12 formed between the tip of the outer cylinder 15 and the nozzle opening 11c of the nozzle body 11.

[0021] The membrane 17 is elastic and is made of, for example, rubber or nonwoven fabric. The membrane 17 prevents foreign matter from entering the inside of the nozzle part 10 from the tip. Also, because the membrane 17 is elastic, it can absorb vibrations of the nozzle body 11 while keeping the gap 12 sealed at all times. Note that the membrane 17 may be provided as needed. In other words, the membrane 17 is not essential in this embodiment.

[0022] As shown in Figure 1, the vibrating unit 20 is attached to the side of the nozzle body 11 and vibrates the nozzle body 11 in a direction intersecting the central axis C of the nozzle body 11. In this embodiment, the vibrating unit 20 is configured to vibrate the nozzle body 11 (tiny tube 11b) in a direction substantially perpendicular to the central axis C, but the direction in which the vibrating unit 20 vibrates the nozzle body 11 does not necessarily have to be substantially perpendicular to the central axis C. In other words, it is sufficient that the nozzle body 11 is not vibrated in the direction of the central axis C.

[0023] Figure 3(a) is a diagram showing the configuration of the vibrating unit 20, and (b) is a view of the rotor 22 from the tip side. As shown in Figures 3(a) and (b), the vibrating unit 20 comprises, for example, a small vibrating motor 21, a rotor 22 which is an oscillator, and a housing 23 which covers the vibrating motor 21.

[0024] The vibration motor 21 is connected to the control unit 30 via a cable 28 (see Figure 1). A rotor 22 is attached to the output shaft 21a of the vibration motor 21. The rotor 22 is partially cut out in the circumferential direction from the center (the dotted line portion in Figure 3(b)). Therefore, when the vibration motor 21 is driven, the rotor 22 rotates in the R direction in the figure in an unbalanced state. In this way, an excitation force is generated by the rotor 22.

[0025] In this embodiment, the size of the vibration motor 21 is, for example, in the range of approximately 3 to 8 mm in diameter, 12 to 40 mm in length, and 10 to 60 g in weight. Also, in this embodiment, the rotational speed of the vibration motor 21 is, for example, a maximum of 16,000 rpm.

[0026] Next, the mounting posture and position of the vibrating unit 20 will be described. As shown in Figure 1, the vibrating unit 20 is installed on the side of the nozzle body 11 (tube 11b) in a predetermined posture. Specifically, the output shaft 21a of the vibration motor 21 is aligned with the central axis C of the nozzle body 11, and the rotor 22 is installed in contact with the tube 11b of the nozzle body 11. Therefore, when the vibration motor 21 is driven, the excitation force of the rotor 22 is transmitted to the tube 11b. As a result, the tube 11b swings in a direction substantially perpendicular to the central axis C (in the direction of arrows B1 and B2 in Figure 1). In this embodiment, the means of fixing the vibrating unit 20 to the nozzle body 11 is not limited. For example, the vibrating unit 20 and the nozzle body 11 may be fixed with adhesive, or a bracket may be provided on the nozzle body 11 and the vibrating unit 20 may be fixed to this bracket with bolts.

[0027] Alternatively, the vibration motor 21 may be mounted on the side of the nozzle body 11 such that the output shaft 21a is not parallel to the central axis C of the nozzle body 11, but for example, in a direction that intersects the plane of Figure 1 (more preferably in a direction that is approximately perpendicular to the plane of Figure 1).

[0028] Furthermore, the vibrating part 20 is provided at a specific position on the side of the capillary tube 11b. Here, the specific position means that when the total length of the capillary tube 11b is L and the distance from the base end of the capillary tube 11b (the connection part between the capillary tube 11b and the head 11a) to the contact position between the capillary tube 11b and the rotor 22 (i.e., the excitation point) is L´, preferably, 0.2 < L´ / L < 0.75, and more preferably, 0.4 < L´ / L < 0.60. The reason why this numerical range is preferable will be explained below.

[0029] Figure 4 is a diagram showing the relationship between L´ / L and the amplitude An. In Figure 4, the horizontal axis represents L´ / L, and the vertical axis represents the amplitude An of the capillary tube 11b. On the horizontal axis, the closer the numerical value is to 0, the closer the vibration motor 21 is provided to the base end of the capillary tube 11b, and the closer the numerical value is to 1.0, the closer the vibration motor 21 is provided to the tip of the capillary tube 11b.

[0030] As shown in Figure 4, when the vibration motor 21 is provided near the base (root) of the capillary tube 11b, the amplitude An at the tip of the capillary tube 11b, i.e., the nozzle 11c, is small. Conversely, when the vibration motor 21 is provided near the tip of the capillary tube 11b, i.e., near the nozzle 11c, since the weight of the vibration motor 21 is applied to the tip of the capillary tube 11b, the amplitude An still does not become large.

[0031] Therefore, in order for the liquid columnar water ejected from the nozzle 11c to change into droplets, it is necessary to attach the vibration motor 21 in a range where the amplitude An becomes relatively large, and the appropriate range is amplitude An > An1. Therefore, the preferable range of L´ / L is 0.2 < L´ / L < 0.75. And the more preferable range is a range where the amplitude An is relatively large, that is, amplitude An > An2. Therefore, the more preferable range of L´ / L is 0.4 < L´ / L < 0.60.

[0032] The control unit 30 shown in Figure 1 is a controller that controls the drive of the vibration motor 21. The control unit 30 has a configuration in which the CPU, RAM, ROM, HDD, input I / F, and output I / F are connected to each other via a bus. In this hardware configuration, the CPU reads the calculation program (software) stored in a recording medium such as ROM, HDD, or optical disc, expands it onto RAM, and executes the expanded calculation program. The calculation program and hardware work together to realize the functions of the control unit 30. The control unit 30 controls the drive of the vibration motor 21 based on predetermined excitation conditions.

[0033] Here, we will explain how the water sprayed from the nozzle opening 11c of the nozzle body 11 changes into droplets. Figure 5 is a schematic diagram showing how a columnar liquid water changes into droplets, Figure 6 is a schematic diagram showing how droplets change when the amplitude of the capillary tube 11b is large, and Figure 7 is a schematic diagram showing how droplets change when the amplitude of the capillary tube 11b is small.

[0034] As shown in Figure 5, the capillary tube 11b is excited by the vibration motor 21 and therefore vibrates in the left-right direction in the figure (i.e., in the direction of arrows B1 and B2). As a result, the liquid column WC of water ejected from the nozzle 11c of the capillary tube 11b oscillates from side to side, and the splitting of the liquid column WC is also governed by this oscillating motion. The liquid column WC splits due to this forced vibration into liquid droplets WD, and these liquid droplets WD disperse.

[0035] Here, we will describe the findings obtained within the scope of the present invention regarding the trend of changes in characteristics when the liquid flow rate increases. In Figure 5, when the vibration of the capillary tube 11b is the same, as the liquid flow rate increases, the position where the liquid column WC splits into droplets WD shifts downstream. Also, when the liquid flow rate is high, the limit of the lateral spread of the droplet group in Figure 5 narrows. Furthermore, the size of the droplets WD tends to increase with increasing liquid flow rate.

[0036] The dispersion range of the target droplet group can be controlled by the combination of the vibration intensity and the injection flow rate in the nozzle body 11. For example, as shown in FIG. 6, when the amplitude of the capillary tube 11b is large, the dispersion range becomes large, and as shown in FIG. 7, when the amplitude of the capillary tube 11b is small, the dispersion range becomes smaller than that in FIG. 6. In addition, the size of the dispersed droplets WD can also be adjusted by the diameter of the nozzle 11c (nozzle diameter).

[0037] Next, the above-described predetermined vibration conditions will be described in detail. The control unit 30 controls the vibration applied to the nozzle body 11 in accordance with at least one of the following conditions (A) and (B). That is, the control unit 30 adjusts the vibration intensity of the vibration motor 21.

[0038] Condition (A): When the frequency of the vibration applied to the capillary tube 11b is f (Hz), preferably, 20 < f < 300 Hz, and more preferably, 30 < f < 150 Hz. The reason will be explained.

[0039] FIG. 8 is a conceptual diagram showing the change characteristics of the maximum diameter Dmax of the droplets with respect to the frequency f. In FIG. 8, the amplitude An of the capillary tube 11b is constant. As shown in FIG. 8, when the vibration of the frequency f is applied to the capillary tube 11b, the liquid column WC ejected from the nozzle 11c is split by the vibration and rapidly changes into droplets WD (see FIG. 5). Therefore, for example, when the frequency f is in the range of 0 < f < 20 Hz, the maximum diameter Dmax of the droplets WD rapidly decreases from D3 to D2.

[0040] Fig. 9 is a model diagram showing how the liquid column WC ejected from the nozzle 11c changes into droplets WD when the frequency f is extremely small (f≒0 Hz). As shown in Fig. 9, the liquid column WC (state a1) ejected from the nozzle 11c swings greatly to the left and right, so it splits into long ligaments WL (state b1), passes through the droplets WD1 (state c1), and is finally spheroidized on the downstream side to become the droplet WD2 (state d1). Therefore, the maximum diameter Dmax of the droplet WD2 becomes D3. When the frequency f approaches 20 Hz, the maximum diameter Dmax decreases rapidly to D2.

[0041] When the frequency f exceeds 20 Hz, as the frequency f increases, the maximum diameter Dmax of the droplet WD2 gradually becomes smaller. And as shown in Fig. 8, when the frequency f is around 100 Hz, the maximum diameter Dmax of the droplet WD2 becomes the minimum value (D1).

[0042] On the other hand, as shown in Fig. 8, when the frequency f increases to around 500 Hz, the maximum diameter Dmax increases rapidly and becomes D3 again.

[0043] Fig. 10 is a model diagram showing how the liquid column ejected from the nozzle 11c changes into droplets when the frequency f is very large (f≒500 Hz). As shown in Fig. 10, when the frequency f is very large, only fine deformation occurs in the liquid column WC (state a2), and it slightly changes into the droplet WD1 (state b2), but it mostly changes into the droplet WD2 without splitting from the liquid column WC (state c2). That is, the influence of the splitting of the liquid column WC is small. Therefore, the maximum diameter Dmax of the droplet WD2 is quite large. For example, as shown in Fig. 8, when f = 500 Hz, the maximum diameter Dmax = D3.

[0044] From the above, judging from the characteristics of the maximum diameter Dmax of the droplet WD2, preferably, 20 < f < 300 (Hz), and more preferably, 30 < f < 150 (Hz).

[0045] Condition (B): When the amplitude at the tip of the nozzle is An, preferably, 0.15 < An < 8.0 mm, and more preferably, 0.20 < An < 3.0 mm. The reason will be explained below.

[0046] Figure 11 is a diagram showing the changes in the distance δ between the main droplets and the durability life Lt of the nozzle body 11 with respect to the amplitude An. The distance δ between the main droplets is the distance between the droplets WD dispersed left and right as shown in Figure 6. Also, in Figure 11, the frequency f is constant.

[0047] As shown in Figure 11, immediately after vibration is applied, the distance δ increases rapidly, the increasing tendency becomes gentle at around the amplitude An = 1 mm, and it increases almost monotonically when An > 3 mm (refer to the solid line in Figure 11). Focusing only on the relationship between the amplitude An and the distance δ between the main droplets, the larger the amplitude An, the larger the distance δ of the droplets WD can be made, so that the droplets WD can be sprayed over a wider range.

[0048] On the other hand, when the amplitude An increases, the load applied to the nozzle body 11 increases, so that particularly the connection portion between the capillary tube 11b and the head 11a is likely to be damaged. Therefore, as shown in Figure 11, the durability life Lt of the nozzle body 11 (refer to the broken line in Figure 11) decreases as the amplitude aN increases.

[0049] Therefore, from the relationship between the distance δ between the main droplets and the durability life Lt of the nozzle body 11, the preferable range of the amplitude An is 0.15 < An < 8.0 mm, and more preferably, 0.20 < An < 3.0 mm.

[0050] (Usage method) When using the fluid injection device 1 configured in this way, first, water is supplied to the head 11a (first step). Next, the vibration motor 21 is driven to satisfy the excitation conditions (A) and (B) described above, causing the capillary tube 11b to vibrate in a direction perpendicular to the axial direction (direction of the central axis C) (second step). Then, with the capillary tube 11b vibrating, a column of liquid water is ejected from the nozzle 11c (third step). The liquid column WC then splits into droplets WD on the left and right and changes into droplets WD (fourth step). By ejecting the droplets WD thus generated toward any object, the desired objective, such as cooling or cleaning the object, can be achieved.

[0051] As described above, this embodiment can achieve the following effects.

[0052] In other words, the fluid injection device 1 can inject water from the nozzle 11c while vibrating the thin tube 11b in a direction approximately perpendicular to the central axis C, thereby enabling the water to be injected as droplets. More specifically, in this embodiment, instead of injecting water evenly over the entire surface, vibrating the thin tube 11b in a direction approximately perpendicular to the central axis C allows the water droplets to collide locally with the target of injection.

[0053] Furthermore, because it generates droplets (WD) with a large inertial force relative to the spray direction, there is no spray carryover. Here, carryover refers to the dispersion of unnecessary fine droplets downstream without functioning.

[0054] Furthermore, this embodiment provides a simple device with a nozzle body 11 and a vibration motor 21 as its main components, enabling miniaturization, cost reduction, and a reduction in the number of parts. It also makes the device easy to transport.

[0055] Furthermore, since the control unit 30 controls the drive of the vibration motor 21 within the range that satisfies conditions (A) and (B), it is possible to generate appropriate droplet WD according to the operating conditions, and the nozzle body 11 also has excellent durability.

[0056] Next, preferred application examples of the fluid injection device 1 according to this embodiment will be described. In the following application examples 1 and 2, the nozzle opening 11c of the nozzle body 11 is positioned inside the narrow space 50 described later, at the entrance of the narrow space 50, or in close proximity to the entrance of the narrow space 50.

[0057] (Application Example 1) An example of applying the fluid injection device 1 to a CO2 methanation reactor 40 will be described. The CO2 methanation reactor 40 (hereinafter referred to as reactor 40) is a device that synthesizes methane (CH4) using a mixture of carbon dioxide (CO2) and hydrogen (H2) as the raw material gas 44. Figure 12(a) is a partial cross-sectional view of reactor 40 cut along the axial direction, and Figure 12(b) is a cross-sectional view of CO2 methanation reactor 40 cut along a direction perpendicular to the axial direction.

[0058] As shown in Figures 12(a) and (b), the reactor 40 comprises, for example, three element shells 41 and membrane fins 43 connecting these element shells 41. Each element shell 41 houses an inner tube 42. A raw material gas 44 flows through the inner tube 42. A catalyst 45 is packed between the element shells 41 and the inner tube 42. The membrane fins 43 are provided to equalize the temperature between the element shells 41.

[0059] The surface temperature of the element shell 41 is not uniform, and a localized high-temperature region R1 (specific region) exists due to the reaction between the raw material gas 44 and the catalyst 45. Therefore, as shown in Figure 12(a), for example, the thin tube 11b of the fluid injection device 1 is inserted into the narrow space 50, and droplets WD are injected from the nozzle 11c. In Application Example 1, the narrow space 50 consists of a narrow space 51 surrounded by three element shells 41 and three membrane fins 43, a narrow space 52 formed between two adjacent element shells 41, and the internal space (narrow space) 53 of the inner tube 42. Therefore, by inserting the device into these narrow spaces 51 and 52 and causing droplets WD to collide with the high-temperature region R1 formed on the outer surface of the element shell 41 from the nozzle 11c, only this high-temperature region R1 can be locally cooled. Furthermore, by inserting the thin tube 11b into the internal space 53 and spraying droplet WD, localized cooling or cleaning of the inner tube 42 can be performed.

[0060] Moreover, since the high-temperature region R1 is cooled by droplet WD, a sufficient cooling effect can be obtained even with a small amount of water. If the same cooling effect were to be obtained by spraying water, a larger amount of water would be required. Furthermore, unnecessary excess spray water can cause unwanted cooling, which may lead to the reaction itself failing. In this respect as well, this embodiment is highly effective for localized cooling of the reactor 40. Moreover, although the inner tube 42 has a small inner diameter and is a narrow space, a sufficient cooling effect can be obtained by inserting the thin tube 11b and spraying droplet WD, so the fluid injection device 1 according to this embodiment is suitable for use in narrow spaces.

[0061] (Application Example 2) An example of applying the fluid injection device 1 to a confined space 50 in an object will be described. Figure 13 is a cross-sectional view showing an example of a confined space 50, such as a pipe or a groove in a structure. Figure 13 shows how a mass 55 made of lipids has formed and adhered to a specific region R2 of the confined space 50. In this application example 2, caustic soda is used as a non-viscous fluid instead of water. A thin tube 11b is inserted into the confined space 50, and droplets WD of caustic soda are injected from the nozzle 11c onto the mass 55. Alternatively, the nozzle 11c of the thin tube 11b is placed near the entrance of the confined space 50, and caustic soda is injected from the nozzle 11c. As a result, the lipids are dissolved by the caustic soda, and the mass 55 can be removed.

[0062] As shown in this application example 2, even when a lipid mass 55 is attached to a specific region R2 of a narrow space 50, an excellent cleaning effect can be achieved by appropriately changing the non-viscous fluid used according to the purpose.

[0063] It should be noted that the present invention is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention. All technical matters included in the technical concept described in the claims are subject to the present invention. The embodiments described above are preferred examples, but those skilled in the art can realize various alternative examples, modifications, variations, combinations, or improvements from the contents disclosed herein, and these are included in the technical scope described in the appended claims.

[0064] For example, the fluid injection device 1 may further include a moving device that moves the nozzle body 11 in the direction of the central axis C and / or a rotating device that rotates the nozzle body 11 about the central axis C, and the control unit 30 may control the moving device and / or the rotating device in addition to controlling the vibration motor 21. In this case, the droplets WD can be impacted more accurately against the target of injection. [Explanation of symbols]

[0065] 1 Fluid injection device 10 Nozzle section 11 Nozzle body 11a head 11b Thin tube (nozzle) 11c spout 12 gaps 13 Nozzle Support 15 Outer cylinder 17 membrane 20 Vibration section 21 Vibration motor 21a Output shaft 22 rotors 23 Housing 28 Cables 30 Control Unit 40 CO2 methanation reactor (object) 41 Element Shell 42 Inner tube 43 Membrane fins 44. Raw material gas 45 Catalyst 50,51,52,53 narrow space 55 lumps R1,R2 Specific area WD droplet

Claims

1. A fluid injection device that injects a non-viscous fluid, A tubular nozzle with a nozzle at its tip, The system comprises a vibrating section for vibrating the nozzle, The vibrating part vibrates the nozzle in a direction intersecting the axial direction of the nozzle, causing the columnar non-viscous fluid ejected from the nozzle to split and generate droplets while being vibrated in the direction of the nozzle's vibration. A fluid injection device characterized by the following features.

2. A fluid injection device according to claim 1, The system includes a control unit that controls the vibrating section, The vibrating part is provided at a specific position in the axial direction of the nozzle, away from the tip end to the base end of the nozzle. The control unit controls the vibrating part so that the vibration frequency and amplitude of the nozzle fall within a predetermined range. A fluid injection device characterized by the following features.

3. A method for generating droplets using a fluid injection device as described in claim 1, The aforementioned method, A first step of supplying the non-viscous fluid to the nozzle, A second step involves using the vibrating unit to excite the nozzle in a direction intersecting the axial direction of the nozzle, A third step involves injecting the non-viscous fluid in a columnar form from the nozzle, A fourth step of generating droplets from the ejected columnar non-viscous fluid, A method characterized by the following:

4. A fluid injection system comprising an object having a confined space and a fluid injection device according to claim 1, The nozzle's nozzle opening is positioned within the confined space, at the entrance to the confined space, or near the entrance to the confined space. The vibrating part vibrates the nozzle, causing the droplet to collide with a specific area within the narrow space. A fluid injection system characterized by the following features.

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