JP7679040B2 - Mist Nozzle - Google Patents

Description

The present invention relates to a nozzle that mixes gas and liquid and atomizes the liquid to spray it, a so-called mist nozzle, and in particular to a mist nozzle that uses an external mixing method.

Mist nozzles are one type of spray nozzle used to distribute or spray chemicals or paints. There are two types of mist nozzles: one in which a gas (e.g., air) and a liquid (e.g., water) flow separately into the mist nozzle and are mixed inside the mist nozzle to turn the liquid into mist (internal mixing type), and another in which the gas and liquid flow separately into the nozzle and are mixed at the tip of the mist nozzle (the nozzle outlet part) (external mixing type). With either type, it is extremely important to have a uniform spray pattern and generate a stable mist.

Patent Document 1 discloses a liquid spraying device in which a hose made of a flexible material and a mist nozzle connected to the hose are attached to a hollow, long support rod that is integrally connected to a liquid supply pipe in a backpack power sprayer. In this device, pressurized air generated in a fan case by a fan rotated by an engine during spraying operation reaches the mist nozzle through a curved pipe and a hose, while the liquid in a liquid tank is flowed into the mist nozzle through the liquid supply pipe by driving a mist pump, so that the liquid is atomized in the mist nozzle by the pressurized air and sprayed from the tip of the mist nozzle.

Patent document 2 discloses a mist nozzle that sprays the chemical solution over a wide area by atomizing water or chemical solution ejected from the nozzle of the nozzle body by colliding it with a deflector positioned a small gap in front of it. In this nozzle, the support arm that is attached to the nozzle body and supports the deflector is made of a single thin elastic wire that has a deflector support straight section positioned on a line perpendicular to the ejection center line of the nozzle, and two clip sections that extend to both ends of the deflector support straight section and can be detachably fitted to the outer circumferential surface of the nozzle body.

Patent document 3 discloses a mist nozzle that generates sufficient negative pressure all around the nozzle outlet, allowing for even spraying from the nozzle outlet. This mist nozzle is equipped with a cylindrical nozzle body for directing airflow, and a mist nozzle with a body part located within the nozzle body and having a nozzle outlet at its tip for discharging the chemical solution, and is configured so that a recess is provided around the nozzle outlet on the side of the body part along the airflow direction where the rear airflow is blocked by the body part.

Patent Document 4 discloses a mist nozzle that can spray atomized mist at high speed by suppressing the occurrence of energy loss due to perpendicular collision between pressurized gas and liquid. In this nozzle, a liquid intake port for sucking in liquid is provided on the center line of the injection flow path, and multiple gas outlets for discharging gas to the outside of the liquid intake port are provided concentrically with the liquid intake port, forming an inner atomization region inside the multiple gas outlets on the concentric circle that forms a vortex to atomize the liquid droplets, and the middle part of the injection flow path is widened outward beyond the multiple gas outlets to form an outer atomization region outside the multiple gas outlets on the concentric circle that forms a vortex to atomize the liquid droplets, thereby improving the cleaning and cooling capabilities of the mist nozzle.

Non-Patent Document 1 discloses mist nozzles with different spray hole diameter sizes that can be selected according to the purpose of the mist, the installation height of the nozzle, the environment of the installation location, etc. In this case, the spray hole is made of stainless steel and the main body is made of brass, or both the spray hole and the main body are made of stainless steel, with the intention of preventing the hole from widening due to wear.

Publication No. 4-33961 Publication No. 5-1322 Patent No. 4921409 JP 2022-48605 A

https://mistdotcom.jp/item/02.html

As mentioned above, various mist nozzles have been proposed in order to generate an ideal mist and improve ease of use. However, their structure and usage remain complicated.

The technique disclosed in Patent Document 1 does not aim to improve the nozzle itself, but requires the installation of a new fan to force the inflow of pressurized air. This increases the weight of the liquid application device and also increases manufacturing costs, etc.

The device disclosed in Patent Document 2 requires detailed assembly parts such as a deflector, fixing screws, and support arms. This creates problems in terms of durability and maintenance, and is not something that anyone can easily manage or use.

In the case of the device disclosed in Patent Document 3, it is necessary to generate sufficient negative pressure all around the nozzle outlet, and therefore it is necessary to newly provide a special recess on the side of the body of the mist nozzle that is aligned with the direction of the airflow. In addition, it is necessary to provide a support part for supporting the mist nozzle on the main body of the mist nozzle.

In the device disclosed in Patent Document 4, the internal structure of the nozzle is complex, and the opening of the mist ejection port is exposed to the outside.

Even in the case of the nozzle disclosed in Non-Patent Document 1, the internal structure of the nozzle is complex.

The present invention was made in consideration of the above circumstances, and aims to provide a mist nozzle with a simple and compact structure that can stably generate fine mist even at low pressure and low air volume, and that allows easy adjustment of the amount of mist generated.

The mist nozzle of the present invention has the following configuration to achieve the above objective.

(1) A nozzle body having a cylindrical liquid discharge portion with a liquid discharge port on one end side and a holding portion connected to the other end side of the liquid discharge portion, and a cap having an ejection hole portion penetrating an outer surface portion and an inner surface portion and removably attached to the nozzle body,
the holding portion has a liquid supply path connected to the other end side of the liquid ejection portion to supply liquid to the liquid ejection portion, a gas ejection port from which gas is ejected, and a gas supply path that supplies gas to the gas ejection port,
When the cap is attached to the nozzle body,
a gas ejection part communicating with the gas discharge port, and a space part surrounded by an inner surface part of the cap and the nozzle body and communicating with the ejection hole part and the gas ejection part,
the liquid discharge port is concentric with the ejection hole portion and is located upstream of an axial outer end portion of the ejection hole portion,
the gas discharge port is located downstream of the liquid discharge port,
A mist nozzle configured so that a mixture of the liquid discharged from the liquid discharge port and the gas ejected from the gas ejection portion is ejected from the injection hole portion.

(2) A mist nozzle as described in (1) above, in which the liquid ejection portion is made of metal or alloy.

(3) A mist nozzle according to (1) or (2) above, wherein the liquid ejection port has an outer diameter (Φ) of 0.2 mm or more and 1.0 mm or less, and an inner diameter (Φ) of 0.1 mm or more and 0.9 mm or less.

The mist nozzle of the present invention is a mist nozzle that sprays a mist made of a liquid by using a gas, and is characterized in that it is equipped with a liquid supply passage provided in a resin nozzle body to supply the liquid, a metallic spray part provided removably at the tip of the liquid supply passage to spray the liquid, a gas supply passage provided in the nozzle body to supply and spray gas in the same direction as the liquid sprayed by the spray part, and a resin cap that is removably attached to the nozzle body so as to surround the gas supply passage and the spray part, and has a spray hole through which the gas from the gas supply passage and the liquid from the spray part are mixed and sprayed as a mist, and that when the cap is attached to the nozzle body, the spray part is positioned within the cap without being exposed to the outside of the cap.

The above configuration has a simple and compact structure, and enables stable generation of fine mist even at low pressure and low air volume, and also has the useful effect of making it easy to adjust the amount of mist generated.

In addition, the above configuration is highly durable, practical, and has excellent productivity and cost-effectiveness.

The mist nozzle of the present invention has a simple structure and can stably generate fine mist even at low pressure and low air volume. In addition, the mist nozzle of the present invention allows easy adjustment of the amount of mist generated.

1 is a right side cross-sectional view showing a schematic overall configuration of a mist nozzle according to an embodiment of the present invention; FIG. 2 is an enlarged right-side cross-sectional view of the tip side (downstream side of the liquid and gas) of the mist nozzle according to the embodiment. FIG. 2 is a front view showing a schematic overall configuration of the mist nozzle according to the embodiment. Figure 4(a) is a front cross-sectional view of the mist nozzle of the same embodiment taken along line A-A, Figure 4(b) is a front cross-sectional view of the mist nozzle of the same embodiment taken along line B-B, and Figure 4(c) is a front cross-sectional view of the mist nozzle of the same embodiment taken along line C-C. With regard to this embodiment, Figure 5(a) is a right-side cross-sectional view showing a schematic diagram of the mist nozzle body in a state where the holding portion is connected to the liquid ejection portion, and Figure 5(b) is a right-side cross-sectional view showing a schematic diagram of the state where the liquid ejection portion has been detached from the holding portion. FIG. 13 is a right-side cross-sectional view showing a schematic overall configuration of a mist nozzle according to a modified example of the same embodiment. FIG. 11 is a right side cross-sectional view showing a schematic overall configuration of a mist nozzle according to another modified example of the same embodiment. FIG. 11 is a side view showing a schematic overall configuration of a mist nozzle according to another embodiment of the present invention. FIG. 11 is a perspective view illustrating a positional relationship between an ejection portion and a cap according to another embodiment of the present invention.

One embodiment of the present invention will be described below with reference to Figures 1 to 5. In this specification, components and elements having the same configuration or function are given the same reference numerals, and detailed descriptions will not be repeated.

The mist nozzle 10 of this embodiment is a mist nozzle that uses air (gas) to turn water (liquid) into mist and sprays it. The mist nozzle 10 has a nozzle body 100 and a cap 180 that is removably attached to the nozzle body 100.

The nozzle body 100 has a cylindrical liquid ejection portion 140 having a liquid ejection port 144 provided on one end side, and a holding portion 150 connected to the other end side of the liquid ejection portion 140 .
The holding portion 150 has a gas discharge port 162 from which gas is discharged, and is internally provided with a liquid supply path 120 that is connected to the other end side portion of the liquid discharge portion 140 to supply liquid to the liquid discharge portion 140, and a gas supply path 160 that supplies gas to the gas discharge port 162.
The cap 180 is provided with an ejection hole 182 that passes through the outer surface and the inner surface of the cap 180 .

When the cap 180 is attached to the mist nozzle body 100, that is, when the cap 180 is attached to the mist nozzle body 100, the mist nozzle 10 is provided with a gas ejection part 166 that communicates with the gas outlet 162 and ejects the gas ejected from the gas outlet 162, and a space 170 that is surrounded by the inner surface of the cap 180 and the nozzle body 100. The space 170 communicates with the injection hole part 182 and the gas ejection part 166.
In this state, the liquid ejection section 140 is located at a position that satisfies the following two conditions.
In the X-axis direction in FIG. 1, the liquid ejection port 144 is located on a concentric circle with the ejection hole portion 182 .
In the Y-axis direction in FIG. 1, the liquid ejection port 144 is located upstream of the axial outer end E1 of the nozzle portion 182 in the liquid direction.
In this embodiment, the liquid ejection port 144 is located between the axial outer end E1 of the nozzle portion 182 and the axial inner end E2 of the nozzle portion 182 in the Y-axis direction in FIG.

In the mist nozzle 10 configured as described above, the gas supplied from the gas supply passage 160 and discharged from the gas discharge port 162 is discharged from the gas discharge portion 166 and flows toward the space portion 170. At this time, the flow velocity of the gas on the gas downstream side of the gas discharge portion 166 increases.
Part of the gas that flows into the space 170 with its flow velocity increased swirls within the space 170 and heads toward the injection hole 182. At this time, the gas heads toward the gas downstream side through the gap between the liquid discharge portion 140 and the inner circumferential surface of the injection hole 182 and around the liquid discharge port 144. This increases the differential pressure generated between the gas upstream side and gas downstream side of the injection hole 182, and the gas flow velocity on the gas downstream side of the injection hole 182 increases further.
Therefore, even if the gas supplied to the gas supply passage 160 is low pressure and low volume, the mist nozzle 10 can create a negative pressure state downstream of the injection hole portion 182, i.e., the liquid downstream region of the liquid ejection port 144. Since the liquid ejection port 144 is located upstream of the liquid from the axial outer end E1 of the ejection hole portion 182, the liquid is ejected from the liquid ejection port 144 with low pressure and low volume gas due to the negative pressure, and the mixture of gas and liquid can be efficiently ejected from the injection hole portion 182 with the liquid atomized. This allows the structure of the mist nozzle 10 to be simplified while stably generating fine mist even at low pressure and low volume.
That is, in the mist nozzle 10, the flow rate of the gas filling the space 170 is increased in the gap between the nozzle hole 182 and the liquid discharge section 140 (liquid discharge port 144), causing the gas to be discharged outside the mist nozzle 10. At this time, negative pressure is generated against the liquid present in the liquid discharge section 140, and the liquid is sucked out and discharged together with the gas discharged outside the mist nozzle 10. At this time, the amount of spray can also be increased by supplying the liquid by pressurization.
In addition, the fineness of the sprayed mist can be adjusted by the outer diameter (Φ) D1, inner diameter (Φ) D2 of the liquid discharge port 144 and the positional relationship of the ejection hole portion 182.
In this way, the mist nozzle 10 of the present embodiment has a simple structure and is capable of stably generating fine mist even at low pressure and low air volume.

In addition, with the mist nozzle 10 configured as described above, the cap 180 can be removably attached to the nozzle body 100, so that caps with different diameters of the injection hole portion 182 can be attached to the mist nozzle body 100 depending on the application and the desired amount of mist generated (amount of spray), making it even easier to adjust the amount of mist generated.

The mist nozzle 10 of this embodiment is described in detail below.

The liquid discharge part 140 constituting the nozzle body 100 has a hollow part 142, a liquid discharge port 144 at one end side (liquid downstream side), and a liquid inlet port 146 at the other end side (liquid upstream side). The liquid discharge part 140 may be made of metal, alloy, resin, ceramic, or other material. Considering durability and cost, it is preferable that the liquid discharge part 140 is made of metal or alloy, especially stainless steel.

The outer diameter (Φ) D1 of the liquid ejection port 144 is preferably 0.2 mm or more and 1.0 mm or less. The outer diameter (Φ) D1 is more preferably 0.4 mm or more and 0.9 mm or less, and particularly preferably 0.5 mm or more and 0.8 mm or less. In this embodiment, the outer diameter (Φ) D1 is 0.5 mm.
The inner diameter (Φ)D2 of the liquid ejection port 144 is preferably 0.1 mm or more and 0.9 mm or less. The inner diameter (Φ)D2 is more preferably 0.2 mm or more and 0.8 mm or less, and particularly preferably 0.4 mm or more and 0.7 mm or less. In this embodiment, the inner diameter of the liquid ejection port 144 is 0.4 mm.
The thickness of the liquid ejection portion 140 at the liquid ejection port 144 is preferably 0.01 mm or more and 0.2 mm or less, and more preferably 0.05 mm or more and 0.1 mm or less. In this embodiment, it is 0.05 mm.
Preferably, the outer diameter (Φ)D3 of the liquid inlet 146 is approximately equal to the outer diameter (Φ)D1, and the inner diameter (Φ)D4 of the liquid inlet 146 is approximately equal to the inner diameter (Φ)D2.
The outer diameter (Φ) D1, the inner diameter (Φ) D2, the outer diameter (Φ) D3 and the inner diameter (Φ) D4 can be appropriately selected depending on the gas flow rate and the gas supply pressure.

Furthermore, a liquid supply path 120 provided within a holding portion 150 constituting the nozzle body 100 has a connecting port 120a at one end (liquid downstream side) and a liquid supply port 120b at the other end (liquid upstream side).
The holding portion 150 may be made of any of metal, alloy, resin, and ceramic, or may be made of other materials. Considering the cost, etc., the holding portion 150 is preferably made of resin.
The liquid supply path 120 is connected to the liquid ejection unit 140 via a connecting port 120a. In this embodiment, a concave space 152 is provided at the tip of the liquid downstream side of the holding unit 150, and the other end side of the liquid ejection unit 140 is inserted into the liquid supply path 120 via the space 152 and the connecting port 120a.
The space 152 has substantially the same shape as the liquid ejection part 140 so that the liquid ejection part 140 does not fall off from the holding part 150 when the mist nozzle 10 is in use. Also, the diameter of the connecting port 120a is equal to or greater than the outer diameter (Φ) D3 of the liquid inlet 146 so that the other end side of the liquid ejection part 140 can be inserted into the liquid supply path 120.
Furthermore, liquid supply port 120b is connected to a liquid supply source (not shown) via a pipe or the like.

The liquid supplied from the liquid supply source flows into the liquid supply path 120 from the liquid supply port 120b, passes through the liquid supply path 120, flows into the hollow portion 142 from the liquid inlet 146 of the liquid discharge portion 140, and is discharged from the liquid discharge port 144 through the hollow portion 142. Note that the mist nozzle 10 may be of a self-priming type so that liquid can be supplied from the liquid supply source, or may be capable of supplying liquid using a pump or the like.

The method (form) of connecting the liquid supply path 120 to the other end side of the liquid discharge part 140 is not limited to the above. For example, a method of making the connection port 120a of the liquid supply path 120 convex and fitting it into the inside of one end side of the liquid discharge part 140 via the liquid inlet 146, a method of connecting the two via a connecting member (not shown), and a method of integrally forming the liquid discharge part 140 and the holding part 150 using a 3D printer or the like can be used.

Further, a gas discharge port 162 is provided at one end of the gas supply path 160, and a gas supply port 164 is provided at the other end. The gas supply port 164 is connected to a gas supply source (not shown) via a pipe, a compression adjustment valve, or the like.
The gas supplied under pressure from the gas supply source flows into the gas supply path 160 from the gas supply port 164 , passes through the gas supply path 160 and is discharged from the gas discharge port 162 .
Moreover, gas is ejected from the gas ejection part 166 via the gas ejection port 162. Here, the gas ejection part 166 opens in the same direction or approximately the same direction as the opening direction of the liquid ejection port 144. With this configuration, the gas can be sent to the injection hole part 182 more efficiently.
A compressor is preferably used as the gas supply source. The gas supply pressure of the compressor can be, for example, 0.1 MPa to 1 MPa, and can also be 0.2 MPa to 0.9 MPa, 0.3 MPa to 0.7 MPa, or 0.2 MPa to 0.3 MPa.

The cap 180 is cylindrical and is fitted to the tip side (liquid/gas downstream side) of the nozzle body 100. However, the shape of the cap 180 is not limited to this, and any shape may be used as long as it can be attached to the nozzle body 100 in a detachable manner. Methods for attaching the cap 180 to the nozzle body 100 include, but are not limited to, inserting the tip side of the nozzle body 100 into the cap 180 and fitting it thereto, or providing a fitting groove on one side and a protrusion corresponding to the fitting groove on the other side, and fitting the protrusion into the fitting groove.

The diameter (Φ) D5 of the axial outer end E1 of the injection hole portion 182 is preferably 0.3 mm or more and 1.1 mm or less, more preferably 0.5 mm or more and 1.0 mm or less, and particularly preferably 0.6 mm or more and 0.9 mm or less.
The diameter (Φ) D6 of the axial inner end E2 of the injection hole portion 182 is preferably 0.3 mm or more and 1.1 mm or less, more preferably 0.5 mm or more and 1.0 mm or less, and particularly preferably 0.6 mm or more and 0.9 mm or less.
It is preferable that the diameter (Φ) D5 and the diameter (Φ) D6 are equal to each other. In this embodiment, the diameter (Φ) D5 and the diameter (Φ) D6 are 0.8 mm.
The size of the diameter (Φ) D5 and the diameter (Φ) D6 can be appropriately selected according to the gas flow rate and the gas supply pressure.

In this state, the liquid ejection section 140 is located at a predetermined position in the X-axis direction and the Y-axis direction.
In the mist nozzle 10 of this embodiment, the liquid discharge port 144 is located on a concentric circle with the ejection hole portion 182. In this specification, "on a concentric circle" means that the center point of the radial cross section of the liquid discharge port 144 and the center point of the radial cross section of the axial outer end portion E1 of the ejection hole portion 182 are Φ0.01 mm or less.
The liquid discharge port 144 is located upstream of the axial outer end E1 of the injection hole portion 182 and downstream of the axial inner end E2 of the injection hole portion 182. That is, the liquid discharge port 144 is inserted into the injection hole portion 182.
At this time, the pressure difference occurring between the gas upstream side and the gas downstream side of the injection hole portion 182 (near the liquid discharge port 144) becomes even larger, and the gas flow velocity on the gas downstream side of the injection hole portion 182 further increases. In this way, the mist nozzle 10 can efficiently create a negative pressure in the liquid downstream side region of the liquid discharge port 144, so that liquid can be discharged from the liquid discharge port 144 with a low pressure and low air volume gas supply. In addition, since the gas flow velocity in the gas downstream side region of the injection hole portion 182 can be increased, the mixture of gas and liquid can be efficiently sprayed from the injection hole portion 182 with the liquid further atomized.
Furthermore, it is desirable to adjust the position of the liquid ejection port 144 in the Y-axis direction to a position that is upstream of the axial outer end E1 of the injection hole portion 182 and within a range where the radial cross section is in the same straight line as the axial inner end E2 of the injection hole portion 182.

In this embodiment, the outer diameter (Φ) D1 of the liquid outlet 144 and the diameter (Φ) D6 of the injection hole 182, i.e., the distance L between the outer periphery of the liquid outlet 144 and the inner periphery of the injection hole 182, is preferably 0.5 mm or less, and more preferably 0.1 mm or more and 0.15 mm or less. The distance between the outer periphery of the liquid outlet 144 and the inner periphery of the injection hole 182 can be appropriately selected depending on the gas flow rate and the air pressure supply pressure.

In addition, since the cap 180 is removably attached to the nozzle body 100, multiple caps 180 having spray holes with different opening diameters may be prepared, and the cap 180 attached to the nozzle body 100 may be changed depending on the gas flow rate and gas supply pressure.

Next, a mist nozzle 11 which is a modification of this embodiment will be described with reference to FIG.
In the mist nozzle 11, when the cap 180 is attached to the nozzle body 100, the liquid ejection port 144 is located upstream of the axial outer end E1 of the ejection hole portion 182, and its radial cross section is on the same line as the radial cross section of the axial inner end E2 of the ejection hole portion 182.
At this time, the gas flow path cross-sectional area at the periphery of the gas discharge port 144 is about 1/73 or less of the maximum gas flow path cross-sectional area of the space portion 170. Therefore, the pressure difference generated between the gas upstream side and the gas downstream side of the injection hole portion 182 (near the liquid discharge port 144) becomes even larger, and the gas flow speed at the gas downstream side of the injection hole portion 182 increases further. In this way, the mist nozzle 11 can efficiently create a negative pressure in the liquid downstream side area of the liquid discharge port 144, so that the liquid can be discharged from the liquid discharge port 144 with a low pressure and low air volume gas supply. In addition, since the gas flow speed in the gas downstream side area of the injection hole portion 182 can be increased, the mixture of gas and liquid can be efficiently sprayed from the injection hole portion 182 with the liquid further atomized.

Furthermore, a mist nozzle 12 which is another modified example of this embodiment will be described with reference to FIG.
In the mist nozzle 12 , when the cap 180 is attached to the nozzle body 100 , the liquid discharge port 144 is located upstream in the gas direction relative to the axial outer end E 1 and axial inner end E 2 of the injection hole portion 182 .
At this time, a gas flow area toward the ejection hole portion 182 is generated between the peripheral portion of the liquid ejection port 144 and the axial inner end E2 (peripheral end) of the ejection hole portion 182. Therefore, the gas easily flows into the ejection hole portion 182, that is, the flow rate of the gas easily increases, and a pressure difference easily occurs between the upstream side of the gas and the downstream side of the gas near the liquid ejection port 144. As a result, the liquid downstream side area of the liquid ejection port 144 can be efficiently made negative pressure, so that the mist nozzle 12 can eject liquid from the liquid ejection port 144 with a low pressure and low air volume gas supply. In addition, since the gas flow rate in the gas downstream side area of the ejection hole portion 182 can be increased, the mixture of gas and liquid can be efficiently ejected from the ejection hole portion 182 with the liquid further atomized.

Next, a mist nozzle 20 according to another embodiment will be described with reference to FIGS.
The mist nozzle 20 according to another embodiment is a mist nozzle that sprays water (liquid) by turning it into mist using air (gas), and includes a liquid supply path 220 that supplies water, a metallic spray unit 240 that is detachably attached to the tip 220a of the liquid supply path 220 and sprays water, a gas supply path 260 that is provided within the nozzle body 200 and supplies and sprays air in the same direction as the water sprayed by the spray unit 240 (the direction of arrow A in FIG. 8 ), and a gas supply path 260 and the spray unit 240. The nozzle body 200 is provided with a resin cap 280 (shown by a two-dot chain line in FIG. 8 ) which is removably attached to the nozzle body 200 so as to surround the nozzle body 200 and has an ejection hole 282 formed therein for ejecting mist generated by mixing the air ejected from the gas supply path 260 and the water ejected from the ejection part 240, and when the cap 280 is attached to the nozzle body 200, the ejection part 240 is configured to be located within the cap 280 without being exposed to the outside of the cap 280.

Now, the nozzle body 200 is made of synthetic resin. The nozzle body 200 is provided with a liquid supply passage 220 and a gas supply passage 260 to mix two fluids, water and low-pressure air, at the tip of the nozzle body 200 to break up the water into mist.

The liquid supply passage 220, including the portion that protrudes from the nozzle body 200, is made of synthetic resin and functions as a guide path for supplying water toward the tip 220a.

The ejection part 240 is made of a metal material such as brass or stainless steel, and ejects water from the liquid supply passage 220. The inner diameter (φ1) at the tip of the ejection part 240 is 0.2 mm, but is not limited to this inner diameter and can be changed as appropriate.

The gas supply passage 260 is made of synthetic resin and functions as a guide path for supplying air toward the tip 260a.

The cap 280 is made of synthetic resin, and when attached to the nozzle body 200, an ejection hole 182 with an inner diameter (φ2) of 0.7 mm to 1.2 mm is drilled on the longitudinal extension of the ejection part 240 (horizontal direction in FIG. 8). The inner diameter of the ejection hole 282 can be adjusted as appropriate. By adjusting this inner diameter as appropriate, the diameter of the ejected mist can be adjusted. Furthermore, when the cap 280 is attached to the nozzle body 200, the ejection part 240 is located within the cap 280 and is sealed except for the ejection hole 282 (see FIG. 9).

The operation of the above configuration will be explained.

When air is supplied to the tip 260a side through the gas supply path 260, a low pressure state is created inside the cap 280. When water is supplied to the tip 220a side through the liquid supply path 220, the low pressure air crushes the water. This causes the water to become a mist of, for example, 5 μm.

The mist-like water is then sprayed out of the cap 280 through the spray hole 282.

The amount and diameter of the mist generated can be easily adjusted by adjusting the cap 280 or changing the inner diameter of the liquid supply passage 220.

According to the other embodiment described above, when the cap 280 is attached to the nozzle body 200, the spray portion 240 is positioned within the cap 280 and is configured to be in a substantially sealed state without being exposed to the outside of the cap 280. Therefore, compared to conventional mist nozzles in which the spray portion protrudes or is exposed from the cap, it is possible to achieve high water supply capacity and stable generation of fine mist (5 μm to 20 μm) even at low pressure and low air volume.

In addition, according to the other embodiment described above, only the ejection part 240, which is subjected to the load, is made of metal, and the rest is made of synthetic resin, so it is also advantageous in terms of durability and light weight.

Furthermore, according to the above other embodiments, the structure is simple and compact, making it easy to manufacture, practical, and providing excellent effects in terms of productivity and economy.

The present invention is not limited to the above embodiment, and various modifications are possible without departing from the gist of the invention.

REFERENCE SIGNS LIST 10, 11, 12, 20 ... mist nozzle 100, 200 ... nozzle body 120, 220 ... liquid supply path 140 ... liquid ejection section 240 ... ejection section 160, 260 ... gas supply path 180, 280 ... cap 182, 282 ... ejection hole section

Claims (3)

a nozzle body having a cylindrical liquid ejection section with a liquid ejection port on one end side and a holding section connected to the other end side of the liquid ejection section; and a cap having an ejection hole section penetrating an outer surface section and an inner surface section and removably attached to the nozzle body,
the holding portion has a liquid supply path connected to the other end side of the liquid ejection portion to supply liquid to the liquid ejection portion, a gas ejection port from which gas is ejected, and a gas supply path that supplies gas to the gas ejection port,
When the cap is attached to the nozzle body,
a gas ejection part communicating with the gas discharge port, and a space part surrounded by an inner surface part of the cap and the nozzle body and communicating with the ejection hole part and the gas ejection part,
the liquid discharge port is located concentrically with the ejection hole portion and between an axial outer end portion and an axial inner end portion of the ejection hole portion,
the gas discharge port is located on the other end side of the liquid discharge portion with respect to a position where the liquid discharge port is present ,
A mist nozzle configured so that a mixture of the liquid discharged from the liquid discharge port and the gas ejected from the gas ejection portion is ejected from the ejection hole portion. The mist nozzle according to claim 1 , wherein the liquid discharge portion is made of a metal or an alloy. 3. The mist nozzle according to claim 1, wherein the liquid ejection port has an outer diameter (Φ) of 0.2 mm or more and 1.0 mm or less, and an inner diameter (Φ) of 0.1 mm or more and 0.9 mm or less.

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