Two-fluid spray device

Abstract

To provide a binary fluid spray device capable of maintaining a constant spay quantity of an easily solidified liquid for a long time.MEANS FOR SOLVING THE PROBLEM: A binary fluid spray device 1 comprises: first and second gas spray units 101 and 102 for spraying at least two gases; a liquid spray unit 103 that sprays a liquid; and first and second auxiliary spray units 106 and 107 smaller in opening size per unit area than the first and second gas spray units 101 and 102.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a two-fluid spraying device.

Background Art

[0002] The liquid atomization device of Patent Document 1 created by the present inventors is a revolutionary invention that changed the concept of the conventional two-fluid nozzle. This liquid atomization device includes a gas injection unit that injects two, three, or four gases, and a liquid injection unit that injects a liquid. From the gas injection unit, gases injected at a pressure of 0.2 MPa or less collide with each other in front of the tip of the liquid injection unit to form a collision part or a part including the collision part, and the liquid injected by the liquid injection unit collides with each other to atomize the liquid.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Among the liquids to be sprayed, there are liquids that are likely to solidify. During long-term spraying, they may solidify at the nozzle tip outlet, resulting in a decrease in the spraying amount (so-called clogging phenomenon). In such cases, the nozzle tip is regularly cleaned, or water is sprayed instead of the liquid for cleaning.

[0005] An object of the present invention is to provide a two-fluid spraying device that can maintain a constant spraying amount for a long time for liquids that are likely to solidify, while making use of the features of the liquid atomization device of Patent Document 1 described above.

Means for Solving the Problems

[0006] The two-fluid spraying device (1) is A first gas injection unit (101) and a second gas injection unit (102) for injecting at least two gases, A liquid injection unit (103) that sprays liquid, The system also includes first and second auxiliary injection units (106, 107) which have an opening size (injection outlets 106a, 107a) smaller than the opening size per unit area (injection outlets 101a, 102a) of the first and second gas injection units (101, 102) (or which inject a smaller amount of gas than the amount of gas injected from the first and second gas injection units (101, 102)). The gas injected from the first and second gas injection units (101, 102) is made to collide with the liquid injected from the liquid injection unit (103) to atomize the liquid into fine particles. The injection directions of the first and second gas injection units (101, 102) may be opposite each other in a plan view. The injection directions of the first and second auxiliary injection units (106, 107) may be opposite each other in a plan view. The injection directions of the first and second gas injection units (101, 102) may be opposite each other in a plan view, and the injection directions of the first and second gas injection units may be opposite each other in a plan view in a direction perpendicular to the opposing direction, in which case the injection directions of the first and second auxiliary injection units (106, 107) may be opposite each other in a plan view. They may be arranged in a cross shape (see Figure 2C). The amounts of gas injected from the first and second gas injection units (101, 102) may be set to be the same or substantially the same. The injection angle (α) of the first and second gas injection sections (101, 102) may be smaller than the injection angle (β) of the first and second auxiliary injection sections (106, 107). The angle (θ) of the injection inner surface (23) of the cap section (20) may be larger than angles α and β. The angle (θ) may be between 90° and 160°, the angle (α) between 60° and 150°, and the angle (β) between 80° and 150° (see Figure 2C). The nozzles (106a, 107a) of the first and second auxiliary injection units (106, 107) may extend to the vicinity of the nozzles (101a, 102a) of the first and second gas injection units (101, 102). In addition to the first and second auxiliary injection units (106, 107) mentioned above, one or more auxiliary injection units may be provided.

[0007] The two-fluid spray device (1) is, The main body (10) on which the liquid injection section (103) is formed, The main body (10) may be equipped with a cap portion (20) attached to its tip for forming the first and second gas injection sections (101, 102) and the first and second auxiliary injection sections (106, 107). The first and second gas injection sections (101, 102) are formed by grooves (first and second side slit grooves 13a, 13b) formed on the side surface of the main body (10) and the inner surface (25) of the cap section (20), or they may be formed by grooves (first and second tip slit grooves 131, 132) formed on the injection side top surface (110) of the liquid injection section (103) and the inner surface (23, 24) of the cap section (20). The main body (10) may also have a gas supply unit (13) connected to external piping, etc., and a liquid supply unit (12) connected to external piping, etc. The first and second auxiliary injection sections (106, 107) may be formed by the first and second slit surfaces (133, 134) formed on the injection-side top surface (110) of the main body (10) and the inner surfaces (23, 24) of the cap section (20). The space in the inner surface (24) may allow gas from the first and second side slit grooves (13a, 13b) to be sent to the first and second auxiliary injection units (106, 107) via the space in the inner surface (24).

[0008] In addition to the first and second gas injection units (101 and 102) mentioned above, third and fourth gas injection units may be provided nearby. The first and second auxiliary injection units (106, 107) inject a smaller amount of gas than the first and second gas injection units (101, 102), and their effect as an injection force to atomize liquids is small (or virtually nonexistent). On the other hand, they exert an effect of discharging liquids that tend to solidify at the openings (e.g., injection outlets 101a, 102a) of the first and second gas injection units (101, 102) and the opening (22) of the cap unit (20) to the outside. This effectively suppresses clogging during long-term spraying.

[0009] The aforementioned gas is not particularly limited, but examples include air, clean air, nitrogen, inert gas, fuel-mixed air, oxygen, etc., and can be appropriately set according to the purpose of use.

[0010] The aforementioned liquid is not particularly limited, but examples include water, ionized water, deodorizing liquid, moisturizing liquid, beauty water, cosmetic liquid such as lotion, pharmaceutical liquid, disinfectant liquid such as antiseptic liquid, antibacterial liquid, paint, fuel oil, coating agent, solvent, resin, etc. Even when using a liquid that easily solidifies among the aforementioned types of liquids, it is still effective and can suppress clogging. [Brief explanation of the drawing]

[0011] [Figure 1] This is a diagram showing the configuration of the two-fluid spray device according to Embodiment 1. [Figure 2A] This is a diagram showing a magnified view of the tip of the first side. [Figure 2B] This is a magnified view of the tip of the cap on the second side. [Figure 2C] These are schematic diagrams and injection angles of the first, second, and auxiliary gas injection sections. [Figure 2D] This is a magnified view of the tip of the cap in another embodiment. [Figure 3] This is a diagram illustrating the shape of the tip of the main body. [Figure 4] This figure shows an example of spray characteristic data in Embodiment 1. [Figure 5] This figure shows an example of air volume and spray volume data for the examples and comparative examples.

Best Mode for Carrying Out the Invention

[0012] (Embodiment 1) The two-fluid spraying device 1 of Embodiment 1 will be described with reference to FIGS. 1 to 3. The two-fluid spraying device 1 includes a liquid injection part 103, a first gas injection part 101, a second gas injection part 102, a first auxiliary injection part 106, and a second auxiliary injection part 107. The injection directions of the first and second gas injection parts 101 and 102 face each other in plan view, and the injection directions of the first and second auxiliary injection parts 106 and 107 face each other in plan view, and they are provided at cross positions respectively (see FIG. 2C). The first and second auxiliary injection parts 106 and 107 have an opening size (injection outlets 106a and 107a) smaller than the opening size (injection outlets 101a and 102a) per unit area of the first and second gas injection parts 101 and 102 (see FIG. 2C). Also, they inject a gas volume smaller than the gas volume injected from the first and second gas injection parts 101 and 102. In this embodiment, the injection angle α of the first and second gas injection parts 101 and 102 is smaller than the injection angle β of the first and second auxiliary injection parts 106 and 107. The angle θ of the injection inner surface 23 of the cap part 20 is larger than the angle α and the angle β. In this embodiment, the angle θ is 120°, the angle α is 80°, and the angle β is 90° (see FIGS. 1, 2A, 2B, and 2C). Also, in this embodiment, the injection outlets 101a and 102a of the first and second gas injection parts 101 and 102 are arranged on the injection side in the injection direction rather than the injection outlets 106a and 107a of the first and second auxiliary injection parts 106 and 107. The gas injected from the first and second gas injection parts 101 and 102 is made to collide with the liquid injected from the liquid injection part 103 to atomize the liquid.

[0013] The two-fluid spraying device 1 includes a main body 10 and a cap part 20. The cap part 20 is attached to the tip of the main body 10 and forms the first and second gas injection parts 101 and 102, and the first and second auxiliary injection parts 106 and 107. The liquid injection part 103 is provided on the main body 10. The cap part 20 includes an opening 22 serving as a spraying outlet for fine particles and a tip surface 221. The first and second gas injection sections 101 and 102 are formed by the first and second side slit grooves 13a and 13b formed on the side of the main body 10 and the inner surface 25 of the cap section 20, and by the first and second tip slit grooves 131 and 132 formed on the injection-side top surface 110 of the main body 10 and the inner surfaces 23 and 24 of the cap section 20 (see Figures 2A, 2B, 2C, and 3). The main body 10 is provided with a gas supply unit 13 that connects to external piping, etc., and a liquid supply unit 12 that connects to external piping, etc. The gas supply unit 13 is connected to first and second tip slit grooves 131 and 132 via first and second side slit grooves 13a and 13b, and supplies gas. The liquid supply unit 12 is connected to a liquid injection unit 103 via a through hole 11, and supplies liquid. In this embodiment, the liquid is supplied by the siphon effect.

[0014] The first and second auxiliary injection sections 106 and 107 are formed by the first and second slit surfaces 133 and 134 formed on the injection-side top surface 110 of the main body 10 and the inner surfaces 23 and 24 of the cap section 20. Gas from the first and second side slit grooves 13a and 13b may be sent to the first and second auxiliary injection sections 106 and 107 through the space in the inner surface 24 of the cap section 20.

[0015] The first and second auxiliary injection units 106 and 107 perform smaller gas injections than the first and second gas injection units 101 and 102, and their effect as an injection force to atomize liquids is small (or virtually nonexistent). On the other hand, they exert an effect of discharging liquids that tend to solidify to the outside at the openings of the first and second gas injection units 101 and 102 and the opening 22 of the cap unit 20. This effectively suppresses clogging during prolonged spraying.

[0016] (Shape of the spray nozzle) The opening 22 of the cap portion 20 shown in Figure 2D has a spray outlet 222 that widens (conical) along the spray direction.

[0017] Figure 4 shows the spray characteristics of the two-fluid spray device 1 configured in Embodiment 1 (Figure 1). The relationship between air pressure and air volume, the relationship between air pressure and spray volume, and the relationship between air pressure and average particle size are shown. Tap water was used as the liquid and air as the gas. Each relationship showed approximately linear changes, confirming the stability of quality in commercialization.

[0018] <Clogging Experiment> As Example 1, intermittent spraying was performed for a long period of time using the two-fluid spray device 1 shown in Figure 1, and as a comparative example, using a two-fluid spray device without first and second auxiliary spraying sections (comparative example in Figure 3). Spraying time: Intermittent spraying (1 minute spray, 1 minute pause, repeated) between 9:00 and 17:00 (8 hours / day) Liquid: 500-fold diluted liquid fertilizer (Hyponex®, Hyponex Japan Co., Ltd.) In Figure 5, it was confirmed that the air volume decreased after 50 hours in the comparative example, while it remained nearly constant in the example. Similarly, the spray volume decreased after 40 hours in the comparative example, while it remained nearly constant in the example. This suggests that clogging began to occur after 40 hours in the comparative example, leading to a decrease in both air volume and spray volume. [Explanation of Symbols]

[0019] 1 Two-fluid spray device 10 Main Unit 20 Cap section 101 First gas injection section 102 Second gas injection section 103 Liquid injection part 106 First auxiliary injection section 107 Second auxiliary injection part

Claims

1. The main body and A cap portion attached to at least the tip of the main body, The main body includes a liquid spraying unit that sprays liquid, The main body and the cap portion form a first gas injection section and a second gas injection section for injecting at least two gases, The system comprises the main body and the cap portion, which form first and second auxiliary injection sections having an opening size smaller than the opening size per unit area of ​​the first and second gas injection sections. The nozzles of the first and second gas injection units are located closer to the nozzle side of the liquid injection unit than the nozzles of the first and second auxiliary injection units, and The nozzles of the first and second gas injection units and the nozzles of the first and second auxiliary injection units are located on the injection-side top surface of the main body that forms the nozzle of the liquid injection unit. Two-fluid spray device.

2. The injection directions of the first and second gas injection units are opposite each other in a plan view, and the injection directions of the first and second auxiliary injection units are opposite each other in a plan view in a direction perpendicular to the opposing direction. The two-fluid spray device according to claim 1.

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