JP2012213708A - Washing nozzle, cleaning apparatus using the same, and washing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing nozzle suitable for washing an object to be washed, and to provide a cleaning apparatus, and a washing method.SOLUTION: The washing nozzle 8 in which the inside is made a force feed passage of washing water, a passage converging section 29 is disposed in the force feed passage to generate cavitation bubbles in the washing water fed forcefully, blows off the water from the tip opening, wherein a gas supply member 51 which supplies a gas in the region where the cavitation bubbles are generated is provided in the force feed passage.

Description

  The present invention relates to a cleaning nozzle that can be used for cleaning machines and other objects such as pipes and inner and outer wall surfaces of a tank, a cleaning device using the same, and a cleaning method.

In the food manufacturing industry, equipment that manufactures food and drink, especially dairy products, etc., must have residue containing oil components, salts such as protein and calcium in tanks that store food and drink and piping in the process. Therefore, it is necessary to clean regularly and maintain the inside of the tank and the piping clean to ensure the quality of the food and drink.
In cleaning these pipes and the like, there is a method in which cleaning agents for decomposing various components of food and drink are sequentially added and cleaned, and before and after each cleaning agent is supplied, the inside of the piping and the like is rinsed with hot water each time. Although it has been adopted, due to the problems of water consumption due to the use of a large amount of water for cleaning, water treatment costs, environmental burden, and the long time required for cleaning, as an efficient cleaning of objects to be cleaned, For example, an apparatus disclosed in, for example, the following Patent Document 1 for cleaning an object to be cleaned using a cavitation jet has been proposed.

The nozzle of this cleaning device is provided with a high pressure nozzle that ejects water at a high pressure at the center of a low pressure nozzle that ejects water at a low pressure, and jets a cavitation jet by ejecting water from each of the low pressure nozzle and the high pressure nozzle. It has a configuration.
According to this nozzle, the cavitation jet ejected from the tip of the high-pressure nozzle is wrapped with the water ejected from the low-pressure nozzle until it reaches the surface to be cleaned. It is said that the cavitation jet can be concentrated on the surface to be cleaned and the cleaning effect by the crushing impact force can be increased.

JP 2003-62492 A

  However, in the nozzle of the conventional cleaning device, a high pressure nozzle that ejects water at high pressure is provided at the center of the low pressure nozzle that ejects water at low pressure, and cavitation is performed by ejecting water from each of the low pressure nozzle and the high pressure nozzle. Therefore, the generation of cavitation is limited, and the cleaning effect cannot be dramatically improved.

  Further, the nozzle of the cleaning device generates a water pressure that wraps the cavitation jet and injects the cavitation jet onto the object to be cleaned and is confined within a certain range so that the jet does not diffuse on the surface to be cleaned. There was a problem that a large amount of water was required, the cleaning cost was increased, and the load on the environment was large.

The present invention provides the following means in order to solve the above problems.
That is, in the cleaning nozzle according to claim 1 of the present application, the inside of the cleaning water is a pressure-feeding passage, and a passage constriction is provided in the pressure-feeding passage to generate cavitation bubbles in the pressure-flushed washing water, so that In the cleaning nozzle to be ejected, a gas supply member that supplies gas in a region where the cavitation bubbles are generated is provided in the pressure-feed passage.

  A cleaning nozzle according to a second aspect of the present invention is the cleaning nozzle according to the first aspect, wherein the passage restricting portion is disposed adjacent to each other in a direction perpendicular to the axial direction of the pressure-feeding passage. The first throttle member has a first inclined surface that gradually narrows the cross-sectional area of the pumping passage from the base end side toward the distal end opening side, and the second throttle member The throttle member has a second inclined surface that gradually expands the cross-sectional area of the pressure-feed passage from the base end side toward the tip opening side, and these first and second throttle members are provided with the second inclined surface. When viewed from the side, the first and second inclined surfaces intersect each other at an intermediate portion between the inclined surfaces, and the pumping passages on the first and second inclined surfaces are above the intersecting portions. In the present invention, they communicate with each other.

  The cleaning nozzle according to claim 3 of the present application is the cleaning nozzle according to claim 2, wherein the first throttle member is adjacent to an end of the first inclined surface on the tip opening side. A first flat surface facing the distal end opening, and the second throttle member is adjacent to an end of the second inclined surface on the proximal end side and faces the proximal end side. 2 flat surfaces are provided.

  A cleaning nozzle according to a fourth aspect of the present invention is the cleaning nozzle according to the second aspect, wherein the first and second throttle members are each formed in a plate shape, and each of the plate surfaces thereof is the first. And it is set as the 2nd inclined surface, It is characterized by the above-mentioned.

  A cleaning apparatus according to claim 5 of the present application is the cleaning nozzle according to any one of claims 1 to 4, a cleaning water tank for storing cleaning water, and pumping the cleaning water in the cleaning water tank to the cleaning nozzle. And an adjustment mechanism for adjusting the pumping of cleaning water to the cleaning nozzle.

  A cleaning method according to claim 6 of the present application is a cleaning method in which cleaning water is pumped into a cleaning nozzle, and the cleaning water is sprayed from the cleaning nozzle onto the target to be cleaned. A step of generating cavitation bubbles in the cleaning water and swirling the cleaning water around the axis of the nozzle; and a step of supplying a gas in a region where the cavitation bubbles are generated; It is characterized by spraying onto the object to be cleaned.

According to the cleaning nozzle, the cleaning apparatus using the same, and the cleaning method according to the present invention, the following effects can be achieved by the above-described solving means.
That is, according to the cleaning nozzle according to claim 1 of the present application, the gas supplied from the gas supply member serves as a bubble nucleus when the cavitation bubble is generated and promotes the generation of the cavitation bubble. The impact force and thermal energy generated at the time are increased, and the cleaning power by the impact force and thermal energy is improved.
In addition, by supplying gas to the cleaning water, cavitation bubbles can be generated effectively and the cleaning power can be improved, so that the use of a large amount of water can be avoided by suppressing the use of detergents, water costs, water treatment There is an effect that the cost and the load on the environment can be greatly suppressed.

  According to the cleaning nozzle of the second aspect, since the cavitation jet can be generated by the first and second throttle members and a helical rotational force can be applied to the jet, the jet has its flow velocity. And maintaining the washing water at a low pressure allows the cavitation jet to be ejected further. Also, by maintaining the flow velocity of the jet and maintaining the wash water at a low pressure, the period during which the pressure of the wash water is maintained below the low pressure at which the cavitation bubbles grow is increased, and the cavitation bubbles grow larger. Can do. Thereby, it is possible to increase the total amount of cavitation bubbles, or to reduce the amount of cavitation bubbles before reaching the inner wall surface of the object to be cleaned, and to improve the cleaning power on the inner wall surface of the object to be cleaned. There is an effect that can be done.

  According to the cleaning nozzle of the third aspect, the second flat surface facing the base end side of the second throttle member causes the cleaning water that has flowed to the second throttle member side to pass through the cleaning water flowing to the first throttle member. Since water is collected on the first inclined surface, the water pressure of the cleaning water flowing through the first throttle member can be easily increased, and the cavitation jet can be generated more efficiently.

  According to the cleaning nozzle of claim 4, the first and second throttle members are formed in a plate shape, and when the first and second throttle members are viewed from the side, the respective plate surfaces are respectively mutually The cavitation jet generated when the cleaning water flows from the first throttle member to the second throttle member, and the cleaning water from the second throttle member to the first throttle member Since the swirl flow can be effectively generated by the two flows including the cavitation jet flowing in the flow, it is possible to generate a powerful jet with a lot of cavitation bubbles.

  Further, according to the cleaning device of the fifth aspect, the gas supplied to the region where the cavitation bubbles are generated can be a bubble nucleus when the cavitation bubbles are generated, and the generation of the cavitation bubbles is promoted. The impact force and thermal energy generated when the cavitation bubble collapses increase, and the cleaning power by the impact force and thermal energy can be improved.

Further, according to the cleaning method of the sixth aspect, since a helical rotational force can be applied to the cavitation jet, the jet can maintain its flow velocity, and the cavitation jet can be ejected farther. The gas supplied to the generated area can be used as the bubble core when cavitation bubbles are generated, and the generation of cavitation bubbles is promoted, so the impact force and thermal energy generated when the cavitation bubbles collapse are increased. In addition, there is an effect that it is possible to improve the detergency due to the impact force or thermal energy.
Also, by maintaining the flow velocity of the jet and maintaining the wash water at a low pressure, the period during which the pressure of the wash water is maintained below the low pressure at which the cavitation bubbles grow is increased, and the cavitation bubbles grow larger. Can do. This also can increase the total amount of cavitation bubbles and reduce the amount of cavitation bubbles before reaching the inner wall surface of the object to be cleaned, improving the cleaning power on the inner wall surface of the object to be cleaned. There is an effect that can be.

These are the figures which showed typically the structure of the washing | cleaning apparatus which is the 1st Embodiment of this invention. These are the perspective views which showed the inside of the washing | cleaning nozzle of the washing | cleaning apparatus which is the 1st Embodiment of this invention seeing through. BRIEF DESCRIPTION OF THE DRAWINGS These are the figures which showed the washing | cleaning nozzle of the washing | cleaning apparatus which is the 1st Embodiment of this invention, Comprising: (a) is the top view which showed this washing nozzle, (b) It is the side view shown by partial cross section, (c) is the front view which looked at figure (b) from the front-end | tip of the washing nozzle to the axial direction. These are the perspective views which showed the 1st or 2nd aperture member which comprises the washing | cleaning nozzle of the washing | cleaning apparatus which is the 1st Embodiment of this invention. These are the modification of the washing | cleaning nozzle of the washing | cleaning apparatus which is the 1st Embodiment of this invention. These are the perspective views which showed the inside of the washing | cleaning nozzle of the washing | cleaning apparatus which is the 2nd Embodiment of this invention seeing through. These are the perspective views which showed the 1st or 2nd aperture member which comprises the washing | cleaning nozzle of the washing | cleaning apparatus which is the 2nd Embodiment of this invention. These are the side views which showed the washing nozzle of the washing | cleaning apparatus which is the 2nd Embodiment of this invention in partial cross section. Shows a graph representing the cleaning results. Shows a graph representing the cleaning results.

Embodiments of a cleaning apparatus according to the present invention will be described below with reference to the drawings.
The cleaning device to which the present invention is applied can be widely applied to machinery and other articles as long as it requires cleaning. In the present embodiment, the cleaning device cleans the inside of the storage tank of the milk beverage manufacturing apparatus. The apparatus will be described as an example.

  1 to 3 show a first embodiment of the present invention. FIG. 1 schematically shows a basic configuration of a cleaning apparatus 1. FIGS. 2 and 3 show this configuration. It is the figure which showed the washing nozzle used for a washing | cleaning apparatus.

  As shown in FIG. 1, the washing | cleaning apparatus 1 is an apparatus which wash | cleans the inside of the storage tank T which stores a milk drink, the washing water tank 3 which stored the washing water 2 which consists of raw water etc., the submersible pump 4, and adjustment of flow volume A valve 5, a pipe 6, a flow meter 7, a cleaning nozzle 8, a branch pipe 9, and a gas supply device 50 are provided.

  The submersible pump 4 is a pump that can be sucked and drained by a motor. The submersible pump 4 is arranged in the washing water tank 3 and sucks up the washing water 2 at a predetermined pressure and feeds the washing water 2 to the pipe 6. .

The pipe 6 is composed of a flexible pipe, and the washing water 2 flows from the submersible pump 4 to the washing nozzle 8.
A branch pipe 9 provided with a regulating valve 5 is provided in the vicinity of the submersible pump 4 in the pipe 6. When the branch pipe 9 is opened by the regulating valve 5, the washing water is supplied to the branch pipe 9 according to the opening area. 2 flows and the washing water 2 returns to the washing water tank 3 again. Thus, the adjustment valve 5 and the branch pipe 9 constitute an adjustment mechanism for adjusting the amount of the cleaning water 2 flowing through the pipe 6. Further, the flow rate of the cleaning water 2 fed to the pipe 6 can be confirmed by the flow meter 7.

  As shown in FIG. 2, the cleaning nozzle 8 includes an elongated cylindrical body 10 and first and second throttle members 21 </ b> A that are arranged near the longitudinal middle portion of the cylindrical body 10, specifically, near the front end of the central portion. , 21B, and a cavitation jet is ejected.

The cylindrical body 10 of the cleaning nozzle 8 includes a main body 10A having a substantially U-shaped cross section and a lid body 10B that closes the upper surface of the main body 10A. The main body 10A includes a bottom wall portion 10p and side wall portions 10q, 10q that rise from the side edge of the bottom wall portion 10p and have screw holes 11, 11,... Shown in FIG. . An opening 10t is formed in the bottom wall 10p on the upstream side of the first and second throttle members 21A and 21B so that the gas supply member 51 can be inserted in a watertight manner. The lid 10B is disposed across the side wall portions 10q and 10q, and is fixed to the side wall portions 10q and 10q by screwing.
A flange 12 is formed at the base end 10 a of the main body 10 </ b> A, and a base end opening 12 a is formed at the center of the flange 12. A space formed between the main body 10A and the lid body 10B serves as a pumping passage 20 for pumping the cleaning water 2, and the tip thereof is a tip opening 10b.

  As shown in FIG. 3A, the first and second throttle members 21 </ b> A that generate cavitation in the cylindrical body 10 in the middle part in the longitudinal direction of the cylindrical body 10, more specifically, near the tip of the central part. , 21B can be installed at the position of the bottom wall portion 10p of the cylindrical body 10 with a through hole 22 through which a fixing tool such as a screw can be inserted in a watertight manner from below the bottom wall portion 10p.

  As shown in FIG. 4, the first diaphragm member 21A includes a rectangular bottom surface 24, a first flat surface 25A that rises perpendicularly from one edge 24a in the short direction of the bottom surface 24, and the first flat member A first inclined surface 26A that is inclined from the upper end 25a of the surface 25A toward the other edge portion 24b in the short side direction of the bottom surface 24, and a side surface 27 that rises vertically from the longitudinal edges 24c and 24d of the bottom surface 24. , 27 is a member formed in a triangular prism surrounded by.

  As shown in FIG. 2 and FIG. 3C, the first throttle member 21A has the proximal end portion 10a side of the cylindrical body 10 so that the first inclined surface 26A gradually narrows the cross-sectional area of the pumping passage 20. The first flat surface 25A that faces and is connected to the first inclined surface 26A is disposed so as to face the distal end opening 10b side, and the inside of the cylinder 10 is directed to the base end 10a along the axis L. When viewed in the direction, the cylindrical body 10 is disposed so as to occupy the left half inside the cylindrical body 10 and close to one side wall 10q side in the cylindrical body 10.

  The second throttle member 21B has the same shape as the first throttle member 21A. After the second flat surface 25B closes the pressure-feed passage 20, the pressure-feed passage 20 is cut toward the tip opening 10b. Adjacent to the first throttle member 21A so that the second inclined surface 26B faces the tip opening 10b side and occupies the right half adjacent to the left half inside the cylinder 10 so that the area gradually increases. Has been placed.

As shown in FIGS. 1 and 2, the gas supply device 50 is a device for supplying a gas such as a gas into the pressure feed passage 20, and includes a tubular gas supply member 51, a valve 52, a pressure gauge 53, and a compressor 54. I have.
The gas supply member 51 is a cylindrical member that is inserted into the pressure-feed passage 20 and supplies a gas such as air or steam, and is disposed upstream of the first and second throttle members 21A and 21B. Further, the opening tip of the gas supply member 51 is directed downstream so that the gas is pumped toward the downstream side of the cylindrical body 10.

In the above configuration, the first and second restricting members 21A and 21B form a restricting portion 29 that restricts the flow path through which the cleaning water 2 flows at the substantially central portion in the extending direction of the cylindrical body 10, and FIG. As shown to (a), the area | region above the lower end edge 24b of 26 A of 1st inclined surfaces becomes the inlet 29E of the wash water 2 in the throttle part 29, and as shown to the same figure (b), the 1st and 1st When the two inclined surfaces 26A and 26B are viewed from the side in which the cylindrical body 10 is viewed from the side, the two inclined surfaces 26A and 26B cross each other substantially at the center of the inclined surfaces 26A and 26B, respectively. Forming a space portion 28 communicating with each other at the upper surface of the surface 26A closer to the distal end opening 10b than the crossing portion and the upper surface of the second inclined surface 26B closer to the base end 10a); Further, as shown in FIG. Space above the lower edge 24b of 6B has a outlet 29F of the washing water 2 in the throttle section 29.
As shown in FIGS. 3B and 3C, the pumping passage 20 in the throttle portion 29 is substantially blocked except for the space portion 28, and can generate a cavitation jet.

Next, a method of using the cleaning device 1 and an operation of generating a cavitation jet will be described.
First, as shown in FIG. 1, the submersible pump 4 is disposed in the cleaning water tank 3 filled with the cleaning water 2, and the cleaning nozzle 8 is brought close to the inner wall surface of the storage tank T to be cleaned.
When the submersible pump 4 is driven and the gas supply device 50 is driven simultaneously with or after the submersible pump 4 is driven, the cleaning water 2 is supplied from the base end portion 10a of the cylindrical body 10 through the pipe 6 to the cleaning nozzle 8. While entering the inside, gas is supplied from the gas supply member 51 into the pressure feed passage 20.

  As shown in FIGS. 2 and 3 (b), the wash water 2 that has entered the cylinder 10 is blocked by the second flat surface 25B of the second throttle member 21B, so that the first throttle member 21A The first inclined surface 26A flows into the first inclined surface 26A side, and the first inclined surface 26A is disposed so as to gradually narrow the cross-sectional area of the pumping passage 20 from the proximal end portion 10a of the cylindrical body 10 toward the distal end opening portion 10b. Therefore, the water pressure of the cleaning water 2 gradually increases on the first inclined surface 26A, and reaches the upper portion of the intersection of the first inclined surface 26A and the second inclined surface 26B, that is, the space portion 28. At that time, the washing water 2 flows into the second inclined surface 26B side.

  At this time, since the second inclined portion 26B is arranged so as to gradually expand the cross-sectional area of the pressure-feed passage 20 of the cylindrical body 10, the cleaning water 2 is moved to the second throttle member 21B side of the space portion 28 at a high speed. It flows at a stretch and becomes low pressure, and cavitation bubbles are generated. Further, the gas supplied from the gas supply member 51 is carried (supplied) to the second throttle member 21B side (region where cavitation bubbles are generated) of the space 28 by the cleaning water 2, and the cavitation bubbles are generated. It becomes a bubble nucleus when it occurs. Therefore, compared with the case where gas is not supplied to the region where cavitation bubbles are generated, the generation of cavitation bubbles is promoted, and the total amount (volume) of the generated cavitation bubbles is increased. Therefore, the impact force and thermal energy generated when the cavitation bubbles collapse are increased, and the cleaning force by the impact force and thermal energy is improved.

  As shown by arrows X and Y in FIG. 2, the wash water 2 containing cavitation bubbles is collected at the upper portion of the first inclined surface 26 </ b> A at the throttle portion 29 in the cylindrical body 10, and then the second Since the course is changed to the inclined surface 26B side and the second inclined surface 26B of the second throttle member 21B gradually expands the pumping passage 20 downward, the longitudinal direction when the second inclined surface 26B is passed. It will be accompanied by the swell to turn.

  Therefore, even if the pumping passage 20 expands on the front end side of the first flat surface 25A of the first throttle member 21A and is sprayed from the front end of the cleaning nozzle 8, the spread of the water flow is suppressed, so the decrease in the speed of the water flow is suppressed. Is done. Therefore, the period during which the pressure of the water flow is maintained below the low pressure at which cavitation bubbles grow is extended, and the cavitation bubbles can grow larger. Thereby, the total amount of cavitation bubbles is increased, or the amount of cavitation bubbles is suppressed from decreasing before reaching the inner wall surface of the storage tank T for the object to be cleaned. As a result, the amount of cavitation reaching the inner wall surface of the storage tank T for the object to be cleaned can be increased, and the cleaning power of the inner wall surface of the storage tank T for the object to be cleaned is improved.

  As described above, according to the cleaning device 1 of the present invention, a cavitation jet can be generated by the first and second throttle members 21A and 21B, and a helical rotational force can be applied to the jet. Therefore, the cavitation jet maintains its flow velocity, and the cavitation jet can be ejected further. Also, by promoting the generation of cavitation bubbles and increasing the total amount (volume) of the generated cavitation bubbles, the impact force and thermal energy generated when the cavitation bubble collapses are increased. The effect that it becomes possible to improve a cleaning effect and to improve a cleaning effect dramatically is acquired.

  As a result, the object to be cleaned can be efficiently cleaned without using a detergent, avoiding the use of a large amount of water, and drastically increasing water costs, water treatment costs, and environmental burdens. It is possible to suppress and increase the efficiency of the cleaning operation.

  Further, the second flat surface 25B facing the proximal end portion 10a side of the second throttle member 21B causes the cleaning water that has flowed to the second throttle member 21B side of the cleaning water 2 to be the first of the first throttle member 21A. Since the water is collected on the inclined surface 26A, the water pressure of the washing water 2 flowing through the first throttle member 21A can be easily increased, and the cavitation jet can be generated more efficiently.

In the present embodiment, as shown in FIG. 3A, the second flat surface 25B is formed so as to be orthogonal to the side surface 27 when the cylindrical body 10 is viewed from the flat surface (the lid body 10B side). Therefore, the surface is perpendicular to the axis L when arranged in the cylinder 10, but instead of this shape, the cleaning water 2 in the throttle unit 29 when arranged in the cylinder 10. It may be formed to have an inclined surface (that is, a surface continuously connected to the side surface 27 at an acute angle) 251 that gradually narrows the flow path toward the inlet port 29E.
By adopting such a shape, it is possible to suppress the water flow of the cleaning water 2 pumped from the submersible pump 4 from being attenuated by the second flat surface 25 and to smoothly maintain the water flow of the cleaning water 2 as much as possible. It is possible to flow toward the throttle member 21 </ b> A, and an effect is obtained that a cavitation jet can be efficiently generated.

  Further, as shown in FIG. 3B, there is a gap between the upper ends 25a of the inclined surfaces 26A and 26B of the first and second throttle members 21A and 21B and the inner wall surface of the lid 10B of the cylinder 10. Although formed so as not to have a substantial gap, when the pressure loss of the throttle portion 29 is too large, the first and second throttle members 21A and 21B are provided on the inner wall surface of the lid body 10B of the cylindrical body 10. The dimensions may be such that a slight gap is formed between the two. The point is that the water pressure for generating the cavitation jet in the throttle portion 29 may be applied to the first throttle member 21A.

Next, a test example is shown to verify the effect of the present invention.
[Test Example 1]
This test was performed in order to confirm the level of detergency by gas type.
(Test equipment)
1 to 4 and the apparatus shown in Example 1 to be described later, in order to examine only the influence of gas purely, the throttling part 29 of the cleaning nozzle 8 is removed and the gas supply member 51 is left alone, used.
This modified nozzle was set in the arrangement shown in FIG. In addition, a pressure sensor (manufactured by Toyo Technica Co., Ltd., amplifier built-in type, piezo transducer) was attached to the wall surface of the storage tank T where the washing water ejected from the washing nozzle 8 collides. The attachment method was an attachment method (recess mount method) in which the diaphragm was pulled in from the wall surface, and the recess port had a diameter of 1 mm.

(Test method)
Steam is employed as a representative example of the soluble gas (gas dissolved in the washing water), and the steam is supplied from the gas supply member 51 while changing the steam pressure in the steam pipe to 0.3 MPa, 0.2 MPa, and 0.1 MPa. Blowed into wash water. Further, air is adopted as a representative example of non-dissolvable gas (gas that does not dissolve in the washing water), and the gas supply member is similarly changed while changing the air pressure in the air pipe to 0.3 MPa, 0.2 MPa, and 0.1 MPa. From 51, air was blown into the washing water.
The collision pressure of washing water was measured with a pressure sensor, and data was collected with a data logger. Sampling was at 2 microsecond intervals. Since 30000 pieces of data were obtained when measured for one minute, the arithmetic average was calculated, and the fluctuation range of the collision pressure was used as the measurement result.

(Test results)
The result of this test is as shown in FIG. FIG. 9 is a diagram showing the magnitude of the detergency when steam and air are blown.
In FIG. 9, the vertical axis indicates the magnitude of pressure fluctuation (KPa) on the cleaning surface when the cleaning water hits the cleaning surface. Since the cleaning water bubbles burst on the cleaning surface and pressure fluctuations occur on the cleaning surface, the larger the number on the vertical axis in FIG. 9, the greater the effect of cavitation, indicating that the cleaning power increases. .
From the results of FIG. 9, it was found that the pressure fluctuation was larger and the cleaning power was larger when air was blown, but there was a certain effect even when steam was blown.

[Test Example 2]
This test was conducted to confirm the influence on the cleaning power when steam was blown.
(Test equipment)
In the same manner as in Test Example 1, the apparatus shown in FIGS. 1 to 4 and Example 1 to be described later is used to remove only the gas supply member 51 by removing the restricting portion 29 of the cleaning nozzle 8 in order to examine only the influence of gas. Remodeled and used the remaining one. The modified nozzle was set as shown in FIG.

(Test method)
In advance, a black paint was applied in a thickness of 0.2 mm and a thickness of 100 mm × 100 mm on the wall surface where the cleaning water ejected from the cleaning nozzle 8 collides inside the storage tank T. Next, the cleaning water was ejected from the cleaning nozzle 8. At that time, the steam was changed from the gas supply member 51 to the cleaning water while changing the steam pressure in the steam pipe to 0.3 MPa, 0.2 MPa, and 0.1 MPa. Infused.
After washing, the state where the paint was removed was imaged with a camera, and the image was subjected to black and white binarization processing by computer image processing, and the washed area was calculated. The calculated result was used as an index indicating the detergency by calculating the percentage “Area ratio” (%) using the area where the paint was applied in advance as the denominator and the washed area as the numerator.

(Test results)
The result of this test is as shown in FIG. FIG. 10 is a diagram showing the relationship between the amount of steam blown and the cleaning effect.
In FIG. 10, the horizontal axis represents the cleaning time, and the vertical axis represents “Area ratio” (%) of the cleaning effect. From the result of FIG. 10, it is clear that the cleaning effect increases as the steam is blown.

  In addition, when the results of Test Example 1 and Test Example 2 described above are combined, it can be seen from the results of Test Example 1 that even when gas is supplied at the same pressure, it is better to supply insoluble gas (air). The impact force and thermal energy generated when bubbles collapse on the cleaning surface of the cleaning object can be increased to obtain a high cleaning power. However, even in the case of a soluble gas (vapor), no gas is supplied. It has been found that a higher detergency can be obtained compared to the case where no.

  Examples of the present invention will be specifically described below, but the present invention is not limited to the following examples.

  The cleaning device 1 according to the present embodiment has a closed circuit as a whole, and water (water temperature 14) at a maximum flow rate of 0.2 m3 / min by a submersible pump 4 (QSQA-506-0.4SL manufactured by Kawamoto Pump Co., Ltd.). Tap water at 0 ° C.) can be sprayed from the washing nozzle 8. The length of the cleaning nozzle 8 is 320 mm and the diameter is 20 mm × 20 mm, and the ejection flow rate is indicated by a differential pressure type digital flow meter 7 (Nagano Keiki Co., Ltd., NV81-863-55303). The gas supply member 51 is a pipe having a circular cross section with an outer diameter of 10 mm and an inner diameter of 8 mm, and is disposed upstream of the throttle portion 29. Furthermore, by providing the flow rate control valve 5, the flow rate of 60 L / min to 180 L / min can be controlled.

  Next, a modification of this embodiment will be described with reference to FIG. The cleaning apparatus of the present embodiment is different from the first embodiment described above only in the installation position of the gas supply member 51, and the other configurations are the same as those of the first embodiment described above. Only the position will be described in detail, and the other parts will be described with the same reference numerals as in the first embodiment, and detailed description thereof will be omitted.

  In this modified example, the gas supply member 51 is downstream of the throttle portion 29 and is maintained in a region where cavitation can occur in the cleaning water, that is, the pressure of the water flow of the cleaning water is below a low pressure at which cavitation bubbles grow. It is installed in the area.

  Also in this case, cavitation can be generated using the gas supplied from the gas supply member 51 as the bubble core, and the cleaning water 2 having a high total amount of cavitation bubbles can be obtained, and the cleaning power of the cleaning water 2 can be increased. .

  In this modification, it is desirable that the gas supply member is disposed in the vicinity of the downstream side of the flat surface 25A of the second throttle portion 21A. By installing the gas supply member 51 on the downstream side of the flat surface 25A, it is possible to generate cavitation while avoiding suppressing the water flow of the cleaning water 2.

  Next, a second embodiment of the present invention will be described with reference to FIGS. Since the cleaning apparatus of this embodiment differs from the above-described first embodiment only in the cleaning nozzle, only the cleaning nozzle will be described in detail, and the other parts will be described in the same reference numerals as in the first embodiment. The detailed explanation is omitted.

  As shown in FIG. 6, the cleaning nozzle 30 includes a cylindrical cylinder 31 and first and first cylinders arranged in the middle of the cylinder 31 in the longitudinal direction, specifically, near the tip opening 31 b in the center. Two throttle members 32A and 32B and a gas supply member 51 are provided, and a cavitation jet can be ejected.

A flange 33 is formed at the base end portion 31 a of the cylindrical body 31 of the cleaning nozzle 30, and a base end opening 33 a is formed at the center of the flange 33.
The internal space of the cylindrical body 31 is a pumping passage 46 for pumping the cleaning water 2, and the tip thereof is a tip opening 31 b.

  As shown in FIG. 7, the first diaphragm member 32A divides a flat ellipse along the major axis m, passes through the semi-elliptical plate surfaces 35 and 36, and passes through the major axis m and is perpendicular to the plate surface 35. It is formed by being surrounded by a thick surface 37 formed on the outer periphery and a peripheral surface 38 surrounding a semi-elliptical circumference.

  As shown in FIGS. 6 and 7, the first throttle member 32A is disposed with an inclination so that the plate surface 35 facing the base end portion 31a side becomes the first inclined surface and the cross-sectional area of the pressure-feed passage 46 is gradually narrowed. In addition, when the inside of the cylindrical body 31 is viewed in the direction of the axis L2 toward the base end portion 31a, the peripheral surface 38 is formed on the inner wall of the cylindrical body 31 with an inclination angle that substantially closes the half of the cylindrical body 31. Are arranged so as to substantially contact each other.

  The second throttle member 32B has the same shape as the first throttle member 32A, and the plate surface 39 facing the tip opening 31b is a second inclined surface, and the cross-sectional area of the pressure-feed passage 46 is changed to the tip opening 31b. It arrange | positions so that it may expand gradually toward the direction, and it arrange | positions the peripheral surface 42 substantially contact | abutting to the inner wall of the cylinder 31 with the inclination angle which substantially blocks the half part on the opposite side of the 1st aperture member 32A in the cylinder 31. Yes.

  At this time, as shown in FIG. 8, the first and second inclined surfaces 35 and 39 cross each other at the substantially central portions of the inclined surfaces 35 and 39 when viewed from the side of the cylindrical body 31. The upper part of the crossing part (that is, the upper part of the surface on the tip opening 31b side than the central part (crossing part) of the first inclined surface 35 and the central part (crossing part) of the second inclined surface 39). A space portion 43 that communicates with each other is formed on the upper surface of the base end portion 31 a side, and the plate surface 36 and the plate surface 40 form a space portion 44 that communicates with each other on the opposite side of the space portion 43.

  The gas supply member 51 is a member that is inserted into the pressure-feed passage 46 and supplies gas, and is disposed upstream of the first and second throttle members 32A and 32B. Further, the opening tip of the gas supply member 51 is directed downstream so that the gas is pumped toward the downstream side of the cylindrical body 10.

  Under the above configuration, the first and second throttle members 32A and 32B form a throttle portion 45 that narrows the flow path through which the cleaning water 2 flows near the tip of the central portion in the extending direction of the cylindrical body 31. The pumping passage 46 in the throttle portion 45 is substantially sealed except for the space portions 43 and 44 so that a cavitation jet can be generated.

Next, the operation when the cleaning water 2 is pumped to the cleaning nozzle 30 will be described.
When the submersible pump 4 and the gas supply device 50 are driven to allow the cleaning water 2 to enter the cleaning nozzle 30 from the base end portion 31a of the cylindrical body 31 via the pipe 6, and supply gas into the pressure feed passage 46, As shown in FIGS. 6 and 8, the cleaning water 2 is provided in the upper and lower portions of the plate surface 35 of the first throttle member 32A and the plate surface 40 of the second throttle member 32B (the back surface of the plate surface 39) ( Since the plate surface 35 and the plate surface 40 are arranged so as to gradually narrow the cross-sectional area of the pressure-feed passage 46 toward the tip opening 31b, the plate surfaces 35 and 40 When the water pressure of the cleaning water 2 gradually increases at the respective front end opening portions 31b and reaches the space portions 43 and 44, the cleaning water 2 is on the other throttle members 32B and 32A side (in the directions of arrows Y and Z). Flow into.

At this time, the plate surfaces 36 and 39 of the other throttle members 32A and 32B are inclined so as to gradually expand the cross-sectional area of the pressure-feed passage 46 of the cylindrical body 31, so that the cleaning that has entered the space portions 43 and 44 is performed. The water 2 flows at a high speed from the first and second throttle members 32A and 32B to the other throttle members 32B and 32A at a high speed and becomes low pressure, and cavitation bubbles are generated.
Further, the gas supplied from the gas supply member 51 is carried by the cleaning water 2 to the first throttle member 32A side or the second throttle member 32B side (region where cavitation bubbles are generated) of the space portions 43 and 44. It becomes a bubble nucleus when cavitation bubbles are generated. Therefore, compared with the case where gas is not supplied to the region where cavitation bubbles are generated, the generation of cavitation bubbles is promoted, and the total amount (volume) of the generated cavitation bubbles is increased. Therefore, the impact force and thermal energy generated when the cavitation bubbles collapse are increased, and the cleaning force by the impact force and thermal energy is improved.

  After the cleaning water 2 is collected on the side of the front end opening 31b of each of the plate surfaces 35 and 40 in the throttle portion 45 in the cylindrical body 31, as indicated by arrows X, Y, W, and Z in FIG. In addition to rapidly flowing toward the other plate surfaces 39 and 36 to generate cavitation bubbles, the flow is changed and the flow path is expanded above or below the pressure-feed passage 46. It becomes a swirl flow in the vertical direction created by the flow in two directions.

  Therefore, even if the pressure-feed passage 46 expands after passing through the throttle portion 45 and is sprayed from the tip of the cleaning nozzle 30, the spread of the water flow is suppressed, so that the speed reduction of the water flow is suppressed. Therefore, the period during which the pressure of the water flow is maintained below the low pressure at which cavitation bubbles grow is extended, and the cavitation bubbles can grow larger. Thereby, the total amount of cavitation bubbles is increased, or the amount of cavitation bubbles is suppressed from decreasing before reaching the inner wall surface of the storage tank T for the object to be cleaned. As a result, the amount of cavitation reaching the inner wall surface of the storage tank T for the object to be cleaned can be increased, and the cleaning power of the inner wall surface of the storage tank T for the object to be cleaned is improved.

  As described above, according to the cleaning nozzle 30 of the present embodiment, a cavitation jet can be generated by the first and second throttle members 32A and 32B, and a helical rotational force can be applied to the jet. As a result, the cavitation jet maintains its flow velocity, and the cavitation jet can be ejected further. Also, by promoting the generation of cavitation bubbles and increasing the total amount (volume) of the generated cavitation bubbles, the impact force and thermal energy generated when the cavitation bubbles collapse is increased, and the impact force and thermal energy The cleaning power is improved, and the cleaning effect can be greatly improved.

In particular, according to the cleaning nozzle 30 of the present embodiment, since the cavitation jet based on the flow in the two directions can be effectively generated by the throttle portion 45, the cleaning ability can be further increased by increasing the amount of pumping water of the submersible pump 4. The effect that it becomes possible to produce | generate the high wash water 2 is acquired. In addition, since the area where cavitation bubbles are generated is widened with the space portions 43 and 44, cavitation can be generated in the flow in two directions, and even more based on the gas supplied from the gas supply member 51. By generating the cavitation bubbles, it is possible to further improve the cleaning ability of the cleaning water 2.
As a result, the object to be cleaned can be cleaned without using a detergent. Therefore, the use of a large amount of water is avoided, and the water cost, water treatment cost, and environmental load are greatly suppressed. In addition, the efficiency of the cleaning operation can be increased.

  Also in this embodiment, the gas supply member 51 is downstream of the first and second throttle members 32A and 32B, and a region where cavitation can occur in the wash water 2, that is, the pressure of the water flow grows cavitation bubbles. By installing in a region maintained at a low pressure or lower, it is possible to obtain the same effect as the cleaning nozzle 8 of the modified example of the first embodiment.

  Moreover, in the said 1st and 2nd embodiment, although gas was supplied as gas in the washing nozzle 8, it may replace with gas and may supply vapor | steam. As shown in FIG. 10, even when supplying at the same pressure, the supply of gas increases the impact force and thermal energy generated when bubbles collapse on the cleaning surface of the object to be cleaned, resulting in a high cleaning power. However, even in the case of steam, a higher detergency can be obtained than when no gas is supplied.

1 Washing device 2 Washing water 3 Washing water tank 4 Submersible pump (pump)
6 Piping 10a Base end portion 21A 1st throttle member 21B 2nd throttle member 25A 1st flat surface 25B 2nd flat surface 26A 1st inclined surface 26B 2nd inclined surface 28 (Above)
32A First throttle member 32B Second throttle members 35, 40 First inclined surfaces 36, 39 Second inclined surfaces 43, 44 Space 51 Gas supply member

Claims (6)

The inside of the washing water is a pressure-feeding passage, and a washing nozzle that generates a cavitation bubble in the pressure-flushed washing water by providing a passage throttle portion in the pressure-feeding passage,
The cleaning nozzle, wherein a gas supply member for supplying gas in a region where the cavitation bubbles are generated is provided in the pressure feeding passage. The cleaning nozzle according to claim 1,
The passage restricting portion includes first and second restricting members disposed adjacent to each other in a direction orthogonal to the axial direction of the pressure-feeding passage,
The first throttle member has a first inclined surface that gradually narrows a cross-sectional area of the pumping passage from the base end side toward the tip opening side,
The second throttle member has a second inclined surface that gradually expands the cross-sectional area of the pumping passage from the base end side toward the tip opening side,
When these first and second diaphragm members are viewed from the side thereof, the first and second inclined surfaces intersect at the intermediate portion of these inclined surfaces,
The cleaning nozzle, wherein the pressure-feed passages on the first and second inclined surfaces communicate with each other above the intersecting portion. The cleaning nozzle according to claim 2,
The first diaphragm member includes a first flat surface facing the tip opening side adjacent to the end of the first inclined surface on the tip opening side,
The second throttle member includes a second flat surface facing the base end side adjacent to the base end side end of the second inclined surface. nozzle. The cleaning nozzle according to claim 2,
The first and second throttle members are each formed in a plate shape, and each of the plate surfaces is the first and second inclined surfaces. The cleaning nozzle according to any one of claims 1 to 4,
A cleaning water tank for storing cleaning water;
A pump and piping for pumping the cleaning water in the cleaning water tank to the cleaning nozzle;
A cleaning apparatus comprising: an adjustment mechanism for adjusting pumping of cleaning water to the cleaning nozzle. Pump cleaning water into the cleaning nozzle,
A cleaning method for cleaning the object to be cleaned by spraying water to be cleaned from the cleaning nozzle,
Generating cavitation bubbles in the wash water and swirling the wash water around the axis of the nozzle;
Providing a gas in a region where the cavitation bubbles are generated,
A cleaning method, wherein the object to be cleaned is sprayed as a swirling flow having the cavitation bubbles.

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