JPH1176878A - Gas-liquid jetting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a widened gas-liquid mixed jet flow with high kinetic energy without requiring enlargement of an apparatus. SOLUTION: This apparatus is so constituted as to produce a gas-liquid mixed jet flow and jets out such a jet flow to the outside by injecting a liquid to a high speed gas flow sent out of a blowing apparatus, forming liquid drops from the liquid injected to the high speed gas flow, accelerating the liquid drops by the gas flow. In this case, a flow route to a jetting outlet 3 of the gas-liquid mixed jet flow is formed from curved faces 15a widened in the direction at right angles to the flow of the gas liquid mixed jet flow and faces 15b narrowed at a constant narrowing ratio so as to have a rectangular cross-section in which the alteration ratio of the inner pressure is made approximately constant at positions in the flow direction of the gas-liquid mixed jet flow.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-liquid jet apparatus for generating and jetting a high-speed gas-liquid mixed jet in which droplets are mixed with an air stream.

[0002]

2. Description of the Related Art A gas-liquid mixing jet in which liquid droplets are mixed with an air stream,
Used for cooling steel and spraying chemicals during rolling,
It is used for cleaning items. The gas-liquid mixed jet used for cooling and spraying the medicine does not need to have high kinetic energy, and is generated by a spray nozzle device as disclosed in, for example, Japanese Utility Model Laid-Open No. 63-13262.
On the other hand, a gas-liquid mixed jet used for cleaning or the like needs to have a high kinetic energy.
No. 274, it is generated by a gas-liquid injection device.

That is, in the latter, a liquid cleaning medium in the form of droplets or a mist is ejected from a cleaning nozzle in an extremely high-speed air flow. A gas-liquid injection device of this type of cleaning device is connected to a low-pressure gas supply source constituted by a roots blower by a gas conveyance path. The low-pressure gas sent through the gas conveyance path is injected at a high speed and a large flow rate from the gas-liquid injection device. A liquid cleaning medium is supplied to the gas-liquid injection device from the cleaning medium supply unit, and a gas-liquid mixed jet composed of a high-speed droplet flow and a high-speed gas flow is generated in the nozzle head of the gas-liquid injection device. In this type of cleaning device, a high-speed air flow velocity of about 200 m / s at the maximum can be realized.
Cleaning with a droplet speed of about 0 m / s is possible, and dirt adhered to products in the manufacturing process of electronic components and precision machinery can be removed.
It can be removed without using chlorofluorocarbon.

[0004]

Even in the above-described conventional gas-liquid injection apparatus, there is a problem to be overcome in order to generate a more effective gas-liquid mixed jet. That is, it is difficult to obtain a divergent gas-liquid mixing jet retaining high kinetic energy without increasing the size of the apparatus, and increase the flow velocity of the gas-liquid mixing jet without increasing the capacity of a low-pressure gas supply source or the like. It is difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a gas-liquid mixture having high kinetic energy while maintaining high kinetic energy without increasing the size of the apparatus. It is an object of the present invention to obtain a gas-liquid injection device capable of generating a jet, and to develop a gas-liquid injection device having a high cleaning effect.

[0006]

According to a first aspect of the present invention, a liquid is injected into a high-speed airflow sent from a blower, and the liquid injected by the high-speed airflow is converted into droplets. For a gas-liquid injection device that accelerates to generate a gas-liquid mixed jet in which a droplet stream and a gas stream are mixed and injects it to the outside, the flow path to the jet port of the gas-liquid mixed jet is In this case, a means for forming a rectangular cross section in which the rate of change of the internal pressure at the position in the flow direction of the gas-liquid mixed jet is substantially constant by the curved surface expanding in the perpendicular direction and the surface reducing at a constant reduction ratio is adopted.

In order to achieve the above object, a second aspect of the present invention is to inject a liquid into a high-speed air stream sent from a blower,
The liquid injected by the high-speed gas stream is accelerated into droplets to generate a gas-liquid mixed jet in which the droplet stream and the gas stream are mixed and ejected to the outside. A gas-liquid injection device having desired characteristics with a rectangular cross section as a flow path leading to the cross-section is reduced by a factor of 1 / n to form a 1 / n-time gas-liquid injection device. Employ means configured as a body.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. First, the entire cleaning device configured by applying the gas-liquid injection device of the first embodiment will be described with reference to FIG. This cleaning device is mainly for cleaning cooking utensils, dishes, and the like. The core part that performs the cleaning function of the cleaning device includes a blowing system 1 that generates and blows a high-speed airflow, a cleaning liquid supply system 2 that supplies a cleaning liquid to the high-speed airflow by the blowing system 1, and a cleaning liquid supply system that supplies a high-speed airflow. Nozzle-shaped gas-liquid ejecting device 4 that generates a gas-liquid mixed jet in which droplets of the cleaning liquid supplied from the nozzle 2 are mixed and ejects from the ejection port 3
It consists of.

The blower system 1 is configured to send the blown air of the blower 5 to the gas-liquid ejecting device 4 through a gas flow path, to generate a high-speed airflow and to blow it out to the outside. Filter is installed. The gas flow path is constituted by an air supply pipe communicating between the blowout side of the blower 5 and the gas-liquid injection device 4. The cleaning liquid supply system 2 is configured as a conduit for feeding the cleaning liquid to the gas-liquid injection device 4, and is provided with a liquid amount adjusting unit 6.

As shown in FIG. 1, a cleaning tank 8 having an opening 7 through which a dish, a frying pan, etc. can be taken in and out, as shown in FIG. Is attached to the cabinet body 9 provided with the above. The gas-liquid injection device 4 is installed in a soundproof space formed in the cabinet body 9 except for the jet port 3, and only the jet port 3 is opened obliquely downward in the lateral direction facing the washing space. The washing tank 8 has a concave portion for drainage at the bottom,
A drain pipe is connected to the lower end of the recess so as to be able to drain to a sewer or the like.

In the cleaning apparatus constructed as described above, the cleaning object is held by hand, and the surface to be cleaned from the opening 7 is opposed to the cleaning space of the cleaning tank 8 and the jet port 3 of the gas-liquid injection device 4. As a result, a cleaning operation is performed. In other words, when the cleaning material obtained by the user is inserted into the cleaning space through the opening 7, the blower 5 is driven to blow air to the gas-liquid injection device 4, and at the same time, the cleaning liquid that has been shut off is discharged to the gas-liquid injection device 4. At a constant flow rate. The cleaning liquid supplied to the gas-liquid ejecting device 4 is formed into droplets by the high-speed gas flow inside the gas-liquid ejecting device 4 and accelerated to become a high-speed droplet flow, and the gas-liquid mixing having high kinetic energy mixed with the gas flow The water is jetted from the jet port 3 to the cleaning object held in the cleaning space.

The gas-liquid mixed jet jetted toward the washing space collides with the object to be washed, and simultaneously exerts the impact force of the high-speed droplet flow and the action of flowing down the water and the wiping action by the collision of the high-speed air stream. As a result, the dirt adhering to the cleaning object is peeled off in a very short time, washed away and blown off, and removed. The dirt-containing droplets are quickly pushed by airflow along the surface of the cleaning object to the end thereof, are separated from the cleaning object, flow down to the bottom side of the cleaning tank 8, and are drained from a drain pipe to a sewer. You.

When the cleaning object is tableware, the speed of the air flow injected from the gas-liquid injection device 4 is 4 from the viewpoint of cleaning performance.
Although it is desirable to be about 0 m / s or more, it is set to about 80 m / s or less in consideration of the impact pressure on the human skin. This value is such that a sufficient cleaning effect is obtained and no pain is felt even when the gas-liquid mixed jet hits the hand. The flow rate of the cleaning liquid supplied from the cleaning liquid supply system 2 is 10 liters /
Minutes or less. In the cleaning apparatus of this embodiment, a gas-liquid mixed jet having a flow rate of about 80 m / s or less is generated and ejected by air of about 1 cubic meter / minute and a cleaning liquid of about 5 liters / minute.

Next, the gas-liquid injection device 4 applied to the cleaning device having the above configuration will be described in more detail with reference to FIGS. The gas-liquid injection device 4 is configured in a nozzle shape in which an airflow introduction unit 10 formed at one end side for introducing a high-speed airflow and an ejection port 3 formed at the opposite end side are connected by an internal flow path. Have been. The central portion is formed as a bulging portion 13 having two steps 12 connected by an arc-shaped step 11 in the vertical direction in FIG. 3, and the lower step 12 is an arc-shaped step. 14 connects to the acceleration section 15 having a rectangular cross-sectional shape following the jet port 3, and the higher step section 12 is connected to the airflow introduction section 10. The accelerating unit 15 includes a curved surface 15a that expands in a direction perpendicular to the flow of the gas-liquid mixed jet,
The surface 15b that contracts at a constant contraction rate has a rectangular cross section in which the rate of change dp / dx of the internal pressure (dynamic pressure) p is substantially constant with respect to the position in the flow direction of the gas-liquid mixed jet. Therefore, the ejection port 3 which is also the opening end of the acceleration unit 15 is
It has a rectangular opening as shown in FIG. Bulge 1
The liquid injection part 16 is incorporated in the inside of the 3 in the width direction.

The liquid injection portion 16 is incorporated in a passage formed by the step portion 12 on the side of the ejection port 3 having a low height of the bulging portion 13 so as to branch the portion of the passage in the vertical direction in FIG. ing. The upstream end of the liquid injection part 16 tapers from the vicinity of the step 11 between the high step part 12 and the low step part 12 and enters the air flow introduction part 10 side. Also,
The downstream end thereof is located slightly upstream of the step 14 between the low step portion 12 and the acceleration portion 15, and an arc-shaped concave portion is formed in the center in the width direction. Step 12 of liquid injection section 16
Both surfaces 17 of the outer shell are formed as streamlined surfaces, and a gap formed by these surfaces 17 and the inner wall 18 of the passage forms a gas-liquid mixing flow path 19. Each gas-liquid mixing channel 19
A liquid discharge port 20 for injecting a liquid (cleaning liquid) into each gas-liquid mixing flow path 19 in a direction crossing each gas-liquid mixing flow path 19 is provided on each of the surfaces 17 of the liquid injection section 16 which is an upstream portion of the liquid injection section 16. ing.

A liquid (cleaning liquid) is supplied to the liquid discharge port 20 from a liquid supply pipe 21 drawn from one side of the liquid injection section 16 to the outside. Each of the liquid discharge ports 20 is opened in a direction substantially perpendicular to the airflow, and is adjusted to a position substantially facing the step 11 between the high step portion 12 and the low step portion 12. The liquid discharge port 20 may be formed as a row of small holes. However, when the liquid discharge port 20 is formed in a slit shape, the ineffective component of the airflow with respect to the droplet formation is reduced, and the droplet formation is improved. These gas-liquid mixing flow paths 19 intersect and merge at an angle of 0 ° or more and less than 90 ° at a merging section 22 downstream of the liquid injection section 16, and communicate with the jet port 3 via the accelerating section 15. ing.

The gas flow introducing section 1 of the gas-liquid injection device 4 having the above-described structure.
0 is connected to the end of the air supply system 1 and the end of the cleaning liquid supply system 2 is connected to the liquid supply pipe 21 of the liquid injection unit 16 to supply a high-speed airflow and liquid (cleaning liquid). A gas-liquid mixed jet having kinetic energy can be ejected. The airflow introduced from the airflow introduction unit 10 is:
The liquid is divided at the upstream end of the liquid injection section 16, flows into the respective gas-liquid mixing channels 19, increases in flow velocity, and flows along the inner wall 18 of the gas-liquid mixing channel 19.

On the other hand, the airflow flowing along the outer shell of the liquid injection section 16 immediately turns the liquid (cleaning liquid) injected from each of the liquid discharge ports 20 into a thin film along the surface 17 and forms an edge-shaped edge. In step (1), the particles are separated from the surface 17 and atomized to form droplets. The droplets are accelerated by the gas flow, become a droplet flow, and flow to the outlet of each gas-liquid mixing channel 19 together with the gas flow. At this time, since an airflow having a high flow velocity flowing on the inner wall 18 side is formed, the droplet flow hardly flows to the inner wall 18 side. Therefore,
The resistance of the droplet to the inner wall 18 due to the adhesion is small, the flow of the gas-liquid mixed flow in the gas-liquid mixing channel 19 is smooth, and the consumption of kinetic energy is small. Since the end of the liquid injection section 16 is edged by an arc-shaped recess, the droplet flow is smoothly separated and flows.

The gas-liquid mixed flows flowing out of the gas-liquid mixing channels 19 intersect and merge at an angle at a junction 22 near the downstream end of the liquid injection section 16. Here, the two gas-liquid mixed flows strongly collide, and the droplets of the droplet stream are atomized by repeated collisions. The atomized droplets increase the acceleration due to the airflow, and flow out from the junction 22 to the acceleration unit 15. Acceleration unit 15
Is formed in a rectangular cross-sectional shape composed of a surface 15b that straightly reduces toward the ejection port 3 at a constant reduction rate and a curved surface 15a that expands toward the ejection port 3 with a constant curve of dynamic pressure change. The gas-liquid mixing jet is narrowed with little turbulence, is agitated and accelerated while expanding, and is squirted vigorously obliquely downward from the ejection port 3 to form a wide gas-liquid mixing jet with a high flow velocity. Performs a good cleaning function. Note that the gas-liquid injection device 4 itself is not limited to a washing device for tableware and the like, and can be applied to, for example, a washing device for a vehicle.

Embodiment 2 FIG. 4 shows a gas-liquid injection device according to the second embodiment. The basic configuration of the gas-liquid injection device is the same as that shown in the first embodiment. Therefore, the same portions as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the second embodiment, the gas-liquid injection device 4 having the desired characteristics as shown in the first embodiment is replaced by 1 /
The gas-liquid injection device 4a is reduced to n times and configured as 1 / n times,
This is configured by arranging n pieces as one functional body as shown in FIG. For example, 1/2 gas-liquid injection device 4
In a, all the dimensions related to the flow path area of the gas-liquid injection device 4 are set to 1 / √2. The flow path area of the gas-liquid injection device 4a is (1 / √2) × (1 / √2) and is 1
/ 2. When these two are arranged as shown in FIG. 4, the width of the gas-liquid mixed jet at the same static pressure and the same air volume as the gas-liquid injection device 4 is 2 × (1 / √2), and the width of the gas-liquid injection device 4 is one. .4 times, the usability when applied to a cleaning device is improved. The gas-liquid injection devices 4a may be arranged close to each other as shown in FIG.

Further, if it is assumed that, for example, a flow rate of 4 l / min is supplied from the liquid injection section 16 to the gas-liquid injection device 4, each liquid discharge port 20 will be responsible for 2 l / min. When two gas-liquid injection devices 4a are arranged,
If the flow rate is 1 / min, each liquid discharge port 20 is responsible for 1 / min. That is, since the liquid film length of the cleaning liquid per unit flow rate becomes √2 times, the liquid film thickness becomes 1 / √2 times, and the initial liquid film thickness from the liquid discharge port 20 becomes thin. The acceleration is accelerated and the acceleration efficiency by the air flow is also improved, so that a gas-liquid mixed jet having a high droplet velocity can be generated.

[0023]

As is clear from the above description of the embodiment, according to the first aspect of the present invention, a wide-spread gas-liquid mixed jet maintaining high kinetic energy can be produced without increasing the size of the apparatus. It is possible to obtain a gas-liquid injection device having a high cleaning effect that can be generated.

According to the second aspect of the present invention, it is possible to obtain a gas-liquid ejecting apparatus having a high cleaning effect capable of generating a spread gas-liquid mixed jet retaining high kinetic energy without increasing the size of the apparatus. .

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a cleaning device to which a gas-liquid injection device according to a first embodiment is applied.

FIG. 2 is a perspective view illustrating the gas-liquid injection device according to the first embodiment.

FIG. 3 is a cross-sectional view of the gas-liquid injection device according to the first embodiment.

FIG. 4 is a cross-sectional view illustrating a gas-liquid injection device according to a second embodiment.

[Explanation of symbols]

1 Blowing system, 2 Cleaning liquid supply system, 3 Spout, 4
Gas-liquid injection device, 4a Gas-liquid injection device, 15a curved surface, 15b surface.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Yasunori Kurahashi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation

Claims (2)

[Claims] A liquid is injected into a high-speed air stream sent from a blower, and the injected liquid is accelerated into droplets by the high-speed air stream to generate a gas-liquid mixed jet in which the droplet stream and the air stream are mixed. A gas-liquid injection device for injecting outside, wherein a flow path to an outlet of the gas-liquid mixed jet is reduced at a constant reduction ratio with a curved surface expanding in a direction perpendicular to the flow of the gas-liquid mixed jet. A gas-liquid injection device having a rectangular cross section in which the rate of change of the internal pressure is substantially constant with respect to the position of the gas-liquid mixed jet in the flow direction. 2. A liquid is injected into a high-speed air stream sent from a blower, and the injected liquid is accelerated into droplets by the high-speed air stream to generate a gas-liquid mixed jet in which the droplet stream and the air stream are mixed. A gas-liquid injection device which injects the gas to the outside, wherein a gas-liquid injection device having a rectangular cross-section to a jet port of the gas-liquid mixed jet and having desired characteristics is reduced by 1 / n to 1 A gas-liquid injection device that constitutes a gas-liquid injection device of / n times and arranges n units as one functional body.