JP2015100720A - Air-spraying microbubble nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a microbubble nozzle which sprays microbubble water in the air at a relatively high pressure and can apply sufficient impact force to an object.SOLUTION: A microbubble nozzle includes: a fluid cap 1 which has a liquid flow passage 2 from a liquid supply port 2' side to a liquid outflow port side; an air cap 5 replaceably arranged on the liquid outflow port side; and a mixing chamber 3 which is positioned in a hollow part of the air cap and is arranged on the liquid outflow port side of the liquid flow passage of the fluid cap. The fluid cap includes an atmospheric air communication port 4 which supplies atmospheric air to the mixing chamber. The mixing chamber includes a first flow passage which has an inner diameter reduced toward a center part, a second flow passage which is communicated with the liquid flow passage on a nozzle chip side and has an inner diameter increased toward the liquid flow passage, and a third flow passage which is positioned between the second flow passage and the first flow passage and has an equal inner diameter. The third flow passage includes an atmospheric vacuum hole sucking air from the atmospheric air communication port 4.

Description

  The present invention relates to a microbubble nozzle that sprays a liquid containing fine bubbles of 50 μm or less in the air.

  Examples of nozzles that generate microbubbles to clean an object to be cleaned, that is, an object include Japanese Patent Application Laid-Open Nos. 2008-114098, 2012-96216, and 2009-273966.

  As this kind of conventional nozzles, the object is in water, and most of the nozzles are used underwater in which the nozzle is set in water.

JP2008-1114098 JP2012-096216 JP2009-273966

Documents 1 and 2 generate microbubbles in the water, so that water tanks for storing water and nozzles to be installed in water require work to draw out the air suction pipes to the atmosphere. There is a problem in that a space for installation is required, and in addition, it takes time to put an object to be cleaned in water, which increases the cost due to equipment and work time. Moreover, the water in a water tank becomes resistance and there also existed a subject that the impact cleaning which makes a microbubble collide with a to-be-cleaned object at high speed cannot be utilized.
Document 3 discloses a nozzle that sprays a liquid containing fine bubbles in the air. However, impact cleaning is weak because of the configuration in which the liquid from the spraying port is directed along the guide wall. Moreover, when it uses by the pressure of 0.7 Mpa or more, there exists a problem of durability that a guide wall is shaved with a liquid and a spray shape and the uniformity of a spray are impaired.
Also, if microbubble water (liquid containing fine bubbles of 50 μm or less) is pressurized with a pump in order to obtain a strong impact and spraying is attempted, there is a possibility that cavitation occurs due to bubbles or the pressure is not increased due to bubbles. In addition, when the gas is forcibly injected, if the liquid pressure becomes high (eg, when the gas is forced into a liquid having a pressure of 2 MPa, the pressure of the gas needs to be 2 MPa or more), it is impossible considering the capacity of the compressor. is there.
In addition, as what is used in air | atmosphere rather than for water, there exists a commercially available shower head which sprays microbubble water in air | atmosphere. In this shower head, microbubble water is sprayed at a very low pressure, so that there is a problem that the impact of the object to be cleaned is very small.

  The present invention has been proposed in view of the above, and the object thereof is to inject microbubble water into the air at a relatively high pressure to give a sufficient impact force, that is, impact to an object. It is in providing the microbubble nozzle which can be performed.

In order to solve the above-mentioned problem, the microbubble nozzle for air spray according to the present invention according to claim 1 is a fluid in which a liquid flow path 2 is formed in the central axial direction from the liquid supply port side 1a to the liquid outlet side 1b. The cap 1 and the fluid outlet 1b of the fluid cap 1 are detachably and replaceably provided, the interior is hollow, the liquid channel 5c is formed, and the nozzle injection port 5d is formed at the tip. An air cap 5 having a nozzle tip 5b; and a mixing chamber 3 located in a hollow portion of the air cap 5 and provided on the liquid outlet side 1b of the liquid flow path 2 of the fluid cap 1. The cap 1 is formed with an air conduction port 4 for supplying air to the mixing chamber 3, and the mixing chamber 3 includes the fluid chamber 4. Communicating with the liquid flow path 2 of the nozzle 1 and communicating with the first flow path 3c having an inner diameter that tapers toward the center and the liquid flow path 5c on the nozzle chip 5b side. And a second flow path 3d having an enlarged inner diameter, and a third flow path 3e located between the second flow path 3d and the first flow path 3c and having an equal inner diameter. In addition, the third flow path 3e has an air suction hole 3f for sucking air from the air conduction port 4.
The microbubble nozzle for air spray according to the present invention according to claim 2 is the microbubble nozzle for air spray according to claim 1, wherein the position of the atmospheric suction hole 3f is in the third flow path 3e, and this third It is characterized by being formed downstream from the center of the flow path 3e.
The microbubble nozzle for aerial spray according to the present invention according to claim 3 is the microbubble nozzle for aerial spray according to claim 1 or 2, wherein the diameter of the nozzle injection port 5d is the third flow of the mixing chamber 3. It is characterized by being larger than the inner diameter of the path 3e.
The microbubble nozzle for air spraying according to the present invention according to claim 4 is the microbubble nozzle for air spraying according to claim 1, 2, or 3, wherein the air cap 5A is a type without the nozzle tip 5b, An adapter 7 is detachably provided on the liquid outlet 1b of the fluid cap 1, and the inside of the adapter 7 is hollow so that the primary pressure water W1 flows from the second liquid channel 3d of the mixing chamber 3. The mixing chamber 7c is formed, and the mixing chamber 7c is connected to the liquid flow path to the nozzle injection port 5d ′, and the secondary pressure water W2 mixed with the primary pressure water W1 flowing into the mixing chamber 7c. Secondary pressure water inlet 7b is formed, the pressure P1 of the primary pressure water W1 and the pressure P2 of the secondary pressure water W2 are P1> P2, and The adapter 7 is provided with an injection nozzle tip 5b ′ having a nozzle injection port 5d ′ for spraying microbubble water into the air.
The microbubble nozzle for air spray according to the present invention according to claim 5 is the microbubble nozzle for air spray according to claim 4, wherein the center extension line a1 of the secondary pressure water inlet 7b is the center extension line of the mixing chamber 3. The position is in contact with a2.
The microbubble nozzle for aerial spray according to the present invention according to claim 6 is the microbubble nozzle for aerial spray according to claim 4 or 5, wherein the diameter of the nozzle injection port 5d 'is the third diameter of the mixing chamber 3. It is characterized by being larger than the inner diameter of the liquid outlet of the flow path 3e.

According to the first to third aspects of the present invention, the number of component parts is small such as the fluid cap 1, the detachable air cap 5, and the mixing chamber 3, and each member has a simple configuration, so that it is easy to assemble and cost. The structure can spray high-bubble water directly into the atmosphere, so it is less time-consuming to install and less expensive in terms of equipment, and there is no pressure loss. Impact cleaning can be performed.
Moreover, since the air cap 5 having the nozzle injection port 5d can be replaced, various spray patterns can be obtained depending on the purpose and application, and the cleaning power is improved by the synergistic effect of the cleaning power of the microbubble water and the appropriate spray pattern. There are advantages to doing.
In this case, by making the air cap 5 into a fan-shaped flat spray pattern, it is possible to obtain a stronger impact than those of other spray shapes. The supply hydraulic pressure can be used in the range of 0.01 to 1.2 MPa, and the higher the supplied hydraulic pressure, the stronger the impact.
According to the fourth to sixth aspects of the present invention, since the secondary pressure water W2 is used and there is no narrowed passage in the secondary pressure water, there is little pressure loss, and the micro sprayed from the nozzle injection port. The impact of bubble mixed water can be strengthened.

The longitudinal cross-sectional view of one Example of this invention. The longitudinal cross-sectional view of the mixing chamber used for this invention. Sectional drawing for demonstrating the air inflow in a mixing chamber same as the above. Another embodiment of the present invention will be described.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the illustrated embodiments, and various design changes can be made without departing from the spirit of the present invention. .

  FIG. 1 shows an embodiment of a gas self-priming type according to the present invention. In FIG. A liquid flow path 2 is formed. And the one end side of the liquid flow path 2 becomes the supply port 2a of the liquid like water. Further, a threaded portion 1c for connection with another member is provided on the outer peripheral portion on one end side of the fluid cap 1. On the other end side of the liquid flow path 2, that is, on the liquid outlet 2b side, the outer shape is substantially cylindrical, and one end portion of a Venturi type mixing chamber 3 is attached. A threaded portion 1d is also formed on the outer periphery of the fluid cap 1 on the other end side that is the liquid outlet 2b side.

  When the mixing chamber 3 is attached, the mixing chamber 3 is inserted from the liquid supply port 2a of the liquid channel 2 of the fluid cap 1 toward the liquid outlet 2b. The liquid outlet 2b of the liquid channel 2 has a step 2c formed of a large diameter portion and a small diameter portion smaller than the large diameter portion. When the mixing chamber 3 is inserted from the liquid supply port 2a of the liquid flow path 2, the step portion 2c functions as a stopper and positioning member that prevents the mixing chamber 3 from coming off.

  On the other hand, a flange-like locking portion 3a projecting in the radial direction protrudes from the outer periphery of one end portion of the mixing chamber 3, that is, the outer peripheral portion located on the liquid inlet 2a side, so that the mixing chamber 3 is placed in the liquid flow path 2. When inserted, the stepped portion of the locking portion 3a and the stepped portion of the stepped portion 2c come into contact with each other so that the mixing chamber 3 can be easily locked at a predetermined position in the liquid flow path 2 of the fluid cap 1. Has been.

  Further, from the outer peripheral portion of the fluid cap 1 and slightly inside the other end 1b of the fluid cap 1 from the inside position of the screw portion 1c, that is, from the position on the outer end face side of the screw portion 1c located on the liquid supply port side 2a. A thick portion 1e protruding in the outer circumferential direction, that is, in the radial direction is bulged from the position on the liquid outlet side 2b to the position on the fluid supply port side 2a slightly from the other end 1b of the fluid cap 1, and At least one or more air conduction ports 4 are formed from the outer end of the thick portion 1e, that is, from the portion from the liquid inlet side 2a of the fluid cap 1 toward the other end 1b side of the fluid cap 1.

  An exchangeable air cap 5 including a cap portion 5a and a nozzle tip 5b is provided on the liquid outlet 2b side of the liquid channel 2 formed in the fluid cap 1. An attachment side of the fluid cap 1 of the cap portion 5 a of the air cap 5 is open, and an inner peripheral portion of the opening portion is attached to an outer peripheral portion of the liquid outlet 2 b of the fluid cap 1. The air cap 5 and the fluid cap 1 are integrated by a retainer ring R provided on the outer peripheral portion thereof.

  The inside of the air cap 5 is hollow. The mixing chamber 3 protruding from the liquid outlet 2b is located in the hollow portion, and the other end of the mixing chamber 3, that is, the liquid outlet faces the liquid channel 5c in the nozzle tip 5b. The liquid channel 5c And the liquid flow path 2 in the fluid cap 1 communicate with each other through a mixing chamber 3. Reference numeral 6 denotes an O-ring provided between the outer periphery of the mixing chamber 3 on the liquid outlet side and the inner peripheral surface of the air cap 5 facing this, and the hollow portion in the air cap 5 and the nozzle tip 5b. The space between the liquid flow paths 5c is sealed.

  The atmosphere conduction port 4 is for supplying the atmosphere toward the mixing chamber 3 located in the hollow portion in the air cap 5, and the atmosphere conduction port 4 is inclined toward the mixing chamber 3, and the atmosphere The discharge part is provided in the hollow part in the cap part 5a.

  FIG. 2 shows the configuration of the mixing chamber 3. The mixing chamber 3 has a substantially cylindrical outer cylinder 3b, and the inside of the outer cylinder 3b is located on the liquid channel 2 side and communicates with the first channel 3c that communicates with the liquid channel 5c side of the nozzle tip 5b. Between the first and second flow paths 3c and 3d, which are located in the center of the outer cylinder 3b, and are connected to the atmosphere by the air suction hole 3f. And a third flow path 3e through which the mixing chamber 3 forms a Venturi tube structure.

  In this case, the inner diameter of the first flow path 3c is a taper that gradually tapers toward the third flow path 3e.

  Further, the inner diameter of the second flow path 3d is formed in a taper shape whose inner diameter is increased toward the liquid flow path 5c.

  The inner diameter of the third flow path 3e is uniform. An air is introduced into the third flow path 3e at a substantially central portion of the outer cylinder 3b, and a small-diameter air suction hole 3f for generating microbubbles in the mixing chamber 3 has an axial direction of the outer cylinder 3b. It is formed at a substantially right angle. The position of the atmospheric suction hole 3f is in the third flow path 3e, and is formed on the downstream side of the center position of the third flow path 3e, that is, on the second flow path 3d side. Located in the area where negative pressure is high.

  That is, the liquid flow is rectified downstream from the center and upstream side of the third flow path 3e and the negative pressure is more stable, and gas is sucked and mixed in this part. This is because microbubble water having a more uniform diameter of fine bubbles can be generated. And by being uniform, the more stable spray shape without variation can be maintained, and a uniform impact can be obtained.

  FIG. 3 shows the number of atmospheric suction holes 3 f formed in the mixing chamber 3. In this embodiment, an example is shown in which six atmospheric suction holes 3f are formed at equal intervals and radially. The number of the air suction holes 3f is preferably in the range of 6-8.

  The air suction hole 3f has a small diameter, and the larger the number, the finer and more microbubbles can be generated. However, the workability and cost of the mixing chamber 3 and the microbubble generation property make the number of holes 6 to 8 the best, and the mixing chamber 3 can be manufactured at a low cost, and the performance is also good. That is, if the number of holes is 5 or less, the amount of microbubbles generated is small, and if it is 9 or more, labor is required for processing, productivity is low, and cost is increased.

  Next, the operation of the present invention will be described.

  The pressure water is supplied from the liquid supply port 2a of the liquid channel 2 formed in the fluid cap 1, and flows into the first channel 3c of the mixing chamber 3 attached to the liquid outlet 2b side. The supply liquid pressure is in the range of 0.01 to 1.2 MPa.

  A gas such as the atmosphere enters from the outer end side of the atmosphere conduction port 4 of the fluid cap 1, and passes through the atmosphere suction hole 3 f of the mixing chamber 3 provided in the air cap 5 in a direction perpendicular to the water flow. It flows into the path 3e.

  The water flowing into the liquid channel 2 vigorously flows into the third channel 3e having a small diameter from the first channel 3c having the tapered shape of the mixing chamber 3, and the flow rate is increased. Therefore, the negative pressure increases. The third flow path 3e has a large negative pressure. Due to the venturi effect, the atmosphere is sucked in through the air suction hole 3f, microbubbles are generated, and the microbubble water is tapered to the second flow path 3d. It is sprayed directly into the air from the nozzle injection port 5d formed in a V-shape at the tip of the nozzle tip through the path 5c, and the microbubble water directly hits the object with a high impact and can be cleaned. The generated microbubbles were measured to be 50 μm or less.

  At this time, since the diameter of the nozzle injection port 5d is larger than the inner diameter of the third flow path 3e of the mixing chamber 3, the internal pressure does not increase, the air can be sucked smoothly, and the air suction hole 3f It is possible to prevent the pressure water from flowing into. If the spray shape of the air cap 5 is a fan-shaped flat spray pattern, it is possible to obtain a stronger impact than other spray shapes.

  Depending on the purpose and application, various spray patterns can be obtained by appropriately selecting and replacing the nozzle tip 5b having the nozzle injection port 5d having a desired shape.

  FIG. 4 shows another embodiment of the present invention.

  In this embodiment, the air cap 5 is replaced with an air cap 5A without the nozzle tip 5b (see FIG. 1), and a substantially cylindrical adapter 7 is attached via the threaded portion 1c of the fluid cap 1, and the tip of the adapter 7 A nozzle nozzle tip 5b ′ having a nozzle nozzle 5d ′ is attached to the part.

  The configurations of the fluid cap 1 and the mixing chamber 3 are the same as those in the above-described embodiment.

  In the adapter 7 used in this application example, at least one or more secondary pressure water inlets 7b are provided in a substantially central portion of the outer cylinder 7a, and a mixing chamber 7c is formed inside the adapter 7. That is, the mixing chamber 7c includes a front outer wall 5a ′ of the air cap 5, an inner peripheral wall of the adapter 7 having a uniform inner diameter, and a rear wall 5e ′ of the injection nozzle tip 5b ′ attached to the tip of the adapter 7. The mixing chamber 7c is connected to the liquid flow path to the nozzle injection port 5d ′.

  And the secondary pressure water W2 of the pressure P2 and the primary pressure water W1 of the pressure P1 discharged from the mixing chamber 3 are mixed in the mixing chamber 7c, and injected from the nozzle injection port 5d '.

  The diameter of the nozzle injection port 5 d ′ is larger than the diameter of the liquid outlet of the second flow path 3 d of the mixing chamber 3. If the diameter of the nozzle injection port 5d ′ is smaller than the diameter of the third flow path 3e, the internal pressure of the liquid flow path becomes high, and air cannot be sucked from the air conduction port 4 of the fluid cap 1, so that microbubble water is generated. Can not. Further, if the diameter of the nozzle injection port 5d ′ is equal to the diameter of the liquid outlet of the third flow path 3e, the amount of bubbles mixed is small when the supply liquid pressure is low and the supply liquid pressure is high. Gas cannot be sucked, and the liquid cannot flow back into the atmospheric suction hole 3f due to a reverse flow or the like. In order to eject good microbubble water, the diameter of the nozzle injection port 5d 'needs to be larger than the diameter of the liquid outlet of the third channel 3e. In this way, the internal pressure of the liquid channel does not increase, and the flow rate of the liquid in the liquid channel near the atmospheric suction hole 3f does not decrease, so the atmospheric suction force by the Venturi tube effect is kept high. . The same can be said for the embodiment shown in FIG.

  In the embodiment of FIG. 4, the relationship between the pressure P1 of the primary pressure water W1 and the pressure P2 of the secondary pressure water W2 is P1> P2 for the following reason.

  That is, when P1 = P2, since the primary pressure water W1, which is microbubble water flowing into the mixing chamber, is small, the amount of microbubbles mixed is small. On the other hand, when P1 <P2, the secondary pressure water W2 flows out into the flow path of the mixing chamber 3 and cannot be used. On the other hand, when P1> P2, the primary pressure water W1 becomes the secondary pressure water W2. In this embodiment, P1> P2 is a feature because the microbubble mixed water can be jetted in order to flow into the mixing chamber by overcoming this pressure.

  The center extension line a1 of the secondary pressure water inflow port 7b is preferably in a positional relationship in contact with the center extension line a2 of the mixing chamber 3. In the case of a positional relationship where the center extension line is not in contact with each other, water rotates in one direction in the mixing chamber 7c, and thus there may be a deviation or variation in the injection from the nozzle injection port 5d ′. In the positional relationship where the central extension line is in contact, the water is mixed without rotating in the mixing chamber 7c, so that a good jet without deviation or variation is obtained.

  As described above, in this embodiment in which the secondary pressure water W2 is used and P1> P2, it is injected from the nozzle injection port 5d ′ by adding the secondary pressure water W2 as compared with the case without the secondary pressure water W2. Since the total flow rate of the microbubble-mixed water is increased, the impact of the microbubble-mixed water ejected from the nozzle ejection port 5d ′ is increased. In addition, since the flow path of the mixing chamber for the secondary pressure water W2 is not narrowed and there is little pressure loss, there is an effect that the pressure can be efficiently changed to strengthen the impact.

  In the present invention, the gas to be sucked is not limited to the atmosphere, and the liquid is not limited to water. The product of the present invention can spray microbubble water with high impact, and is suitable for use in cleaning, peeling, excavation, and the like.

DESCRIPTION OF SYMBOLS 1 Fluid cap 1a Liquid supply port 1b Liquid outflow port 1c, 1d Screw part 2 Liquid flow path 2a Liquid supply port 2b Liquid outflow port 2c Step part 3 Mixing chamber 3a Locking part 3b Outer cylinder 3c 1st flow path 3d 2nd 3e 3rd channel 3f Air suction hole 4 Air conduction port 5, 5A Air cap 5a Cap part 5b Nozzle tip 5b 'Injection nozzle tip 5c Liquid flow channel 5d, 5d' Nozzle injection port 6 O-ring 7 Adapter 7a Outer cylinder 7b Secondary pressure water inlet W1 Primary pressure water W2 Secondary pressure water R Retainer ring

Claims (6)

A fluid cap (1) in which a liquid channel (2) is formed in the central axial direction from the liquid supply port side (1a) to the liquid outlet side (1b);
The fluid cap (1) is detachably and replaceably provided on the liquid outlet side (1b) and is hollow inside to form a liquid channel (5c), and a nozzle injection port (5d) at the tip. An air cap (5) having a nozzle tip (5b) formed with:
A mixing chamber (3) located in the hollow portion of the air cap (5) and provided on the liquid outlet side (1b) of the liquid flow path (2) of the fluid cap (1),
The fluid cap (1) is formed with an air conduction port (4) for supplying air to the mixing chamber (3), and the mixing chamber (3) is a liquid channel (2) of the fluid cap (1). The first flow path (3c) whose inner diameter is tapered toward the center and the liquid flow path (5c) on the nozzle tip (5b) side communicate with the liquid flow path (5c). A second flow path (3d) whose inner diameter is enlarged toward the second flow path (3d) and the second flow path (3d) and the first flow path (3c) are located between the second flow path (3d) and the first flow path (3c). An air spray characterized by having an air suction hole (3f) for sucking air from the air conduction port (4) in the third flow path (3e). Micro bubble nozzle for use.   The microbubble nozzle for air spray according to claim 1, wherein the position of the atmospheric suction hole (3f) is in the third flow path (3e), and is located downstream of the center of the third flow path (3e). An air spray microbubble nozzle characterized by being formed.   The microbubble nozzle for air spraying according to claim 1 or 2, wherein the diameter of the nozzle injection port (5d) is larger than the inner diameter of the third flow path (3e) of the mixing chamber (3). An air spray microbubble nozzle characterized by the above.   The microbubble nozzle for air spray according to claim 1, 2, or 3, wherein the air cap (5A) is a type without a nozzle tip (5b), and the liquid cap outlet side of the fluid cap (1) ( 1b) is detachably provided with an adapter (7), and the inside of the adapter (7) is hollow and primary pressure water (W1) from the second liquid channel (3d) of the mixing chamber (3). Is formed, and the mixing chamber (7c) is connected to the liquid flow path to the nozzle injection port (5d '), and the primary pressure water that has flowed into the mixing chamber (7c). A secondary pressure water inlet (7b) for allowing the secondary pressure water (W2) mixed with (W1) to flow is formed, and the pressure P1 of the primary pressure water (W1) and the pressure of the secondary pressure water (W2) are formed. P2 is P1> P And the adapter (7) is provided with an injection nozzle tip (5b ') having a nozzle injection port (5d') for spraying microbubble water into the air. .   The microbubble nozzle for air spraying according to claim 4, wherein the central extension line (a1) of the secondary pressure water inlet (7b) is in a positional relationship with the central extension line (a2) of the mixing chamber (3). A micro bubble nozzle for air spray, characterized by The microbubble nozzle for air spray according to claim 4 or 5, wherein the diameter of the nozzle injection port (5d ') is larger than the inner diameter of the third flow path (3e) of the mixing chamber (3). A microbubble nozzle for air spraying, characterized in that

Images