JP3301307B2 - Adjustment method of cavitation bubble type submerged nozzle device and cavitation bubble type submerged nozzle device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of adjusting a cavitation bubble type submerged nozzle apparatus for performing cleaning, peeling, hanging, etc. by utilizing the erosion action of cavitation bubbles and a cavitation bubble type submerged nozzle apparatus. is there.

[0002]

2. Description of the Related Art In a cavitation bubble type submerged nozzle apparatus disclosed in Japanese Patent Application Laid-Open No. 5-212317, a cylindrical enlarged diameter chamber is provided in front of an injection hole, and a high-pressure liquid jet is injected from the injection hole into the enlarged diameter chamber. The cavitation bubbles are generated efficiently, and the cavitation bubbles are sent forward from the expansion chamber while being conveyed to the high-pressure liquid jet. The injection hole and the diameter expansion chamber are formed in a nozzle, and this nozzle is screwed to the front end of the lance. In this cavitation bubble type submerged nozzle device, in order to appropriately generate cavitation bubbles, the relationship between the diameter d0 of the injection hole and the axial length L and the diameter D of the cylindrical enlarged chamber is as follows. I have. L = about (5 × d0), D = about (5 × d0)

[0003]

The relationship between d0, L, and D, which can efficiently generate cavitation bubbles, is not fixed as in the above equation. The length of the core changes, and with it. In the cavitation bubble type submerged nozzle apparatus disclosed in JP-A-5-212317, since the relationship between d0, L, and D is fixed, it is difficult to appropriately generate cavitation bubbles due to a change in injection pressure or the like. Or,
In order to cope with the change of each injection pressure and optimize the generation state of the cavitation bubbles, it is necessary to replace the nozzles while preparing various types of nozzles.

An object of the present invention is to provide a method for adjusting a cavitation bubble type submerged nozzle apparatus and a cavitation bubble type submerged nozzle apparatus which can overcome the above-mentioned problems.

[0005]

According to the method for adjusting the cavitation bubble type submerged nozzle apparatus (42) of the present invention, the front side is opened through the throttle opening (68) and the diameter is larger than the injection hole (62). The expanded diameter expansion chamber (72) is disposed in front of the injection hole (62), and the liquid (22) is injected forward from the injection hole (62). And
Such cavitation bubble type submerged nozzle device (42)
The jet interface at the throttle opening (68)
The generation state of the cavitation bubbles (100) is adjusted by changing the distance between (98) and the periphery of the aperture (68).

When the length of the jet core (96) from the injection hole (62) changes due to a change in the injection pressure or the like at the injection hole (62), the radiation of the high-pressure liquid jet in the expanding chamber (72) is caused accordingly. Directional dimensions change. On the other hand, the jet interface (98) at the throttle opening (68)
The distance between the aperture and the peripheral edge of the aperture (68) is, for example, the relative position of the aperture (68) with respect to the injection hole (62) in the front-rear direction and the aperture
It can be changed by changing the aperture amount of (68). Thus, by changing the distance between the jet boundary surface (98) at the throttle opening (68) and the periphery of the throttle opening (68), the injection hole (62)
Cavitation bubbles (100) can be efficiently generated in the enlarged diameter chamber (72), despite the change of the injection pressure in the above.

The cavitation bubble type submerged nozzle apparatus (42) of the present invention has the following elements (a) and (b). (A) Nozzle member having injection holes (62) for injecting liquid (22)
(B) (b) A diameter-enlarging chamber (72) having a diameter larger than that of the injection hole (62) and arranged in front of the injection hole (62), and opening forward through a throttle opening (68). Nozzle member (56) in the front and rear direction provided inside
Large-diameter chamber forming member (64) that can be displaced relative to

The jet (104) is jetted from the injection hole (62) to the enlarged diameter chamber (72), and the diameter gradually increases as the distance from the injection hole (62) increases. The jet core (96) changes due to changes in injection pressure, etc.
Accordingly, the diameter of the cross section of the jet (104) at each position in the front-back direction also changes. On the other hand, the expansion chamber forming member (64) is relatively displaced in the front-rear direction with respect to the nozzle member (56), so that the jet interface (98) at the throttle opening (68) and the throttle opening (6
8) The distance from the periphery changes. Therefore, by changing the relative position of the enlarged-diameter chamber forming member (64) with respect to the nozzle member (56) in the front-rear direction, despite the change of the injection pressure at the injection hole (62), etc. Jet interface (9
The distance between 8) and the periphery of the aperture opening (68) is set to a size that efficiently generates cavitation bubbles (100) in the expansion chamber (72).
Can be matched. In this way, you can replace parts,
There is no need to prepare various parts, and the cavitation bubble (10
0) can be generated appropriately.

Another cavitation bubble type submerged nozzle apparatus (42) of the present invention further has the following element (c). (C) Pressure detecting means (54) for detecting the pressure in the enlarged diameter chamber (72)

When the cavitation bubble (100) is optimally generated in the expansion chamber (72), the expansion chamber (72) is used.
The pressure inside the enlarged chamber (72) and the cavitation bubbles (10
This is related to the optimum generation state of 0). On the other hand, by relative displacement of the enlarged diameter chamber forming member to the longitudinal direction (64) relative to the nozzle member (56), the pressure of the enlarged diameter chamber (72) inside is changed. Therefore, the pressure in the enlarged-diameter chamber (72) detected by the pressure detection means (54) is adjusted so as to be a pressure at which the cavitation bubble (100) is appropriately generated.
By adjusting the relative position of the enlarged-diameter chamber forming member (64) with respect to the nozzle member (56) in the front-rear direction, it is possible to obtain an optimum generation state of the cavitation bubble (100).
In the cavitation bubble type submerged nozzle device (42), the relative position is adjusted based on the detection value of the pressure detection means (54) without directly observing the generation state of the cavitation bubble (100). Be transformed into

Another cavitation bubble type submerged nozzle apparatus (42) of the present invention further has the following element (d). (D) The liquid (3 ) in which the nozzle member (56) is submerged
Remote adjustment means for adjusting the relative position of the enlarged diameter chamber forming member (64) relative to the nozzle member (56) to the longitudinal direction be outside of 8) (52)

The relative position of the enlarged-diameter chamber forming member (64) with respect to the nozzle member (56) in the front-rear direction can be adjusted from outside the liquid (38) in which the nozzle member (56) is submerged by remote adjustment means (52). ) Can be used, so that it is not necessary to wet the hand or to extend the hand to the expanded chamber forming member (64) in the liquid (22) for a long time.
Adjustment work can be streamlined.

Another cavitation bubble type submerged nozzle apparatus (42) of the present invention further has the following elements (e) to (g). (E) Enlarged chamber forming member fitted and screwed into nozzle member (56)
(F) (f) a rotary drive member (92) for rotating the enlarged-diameter chamber forming member (64) relative to the nozzle member (56); (g) remote adjustment means (52) for rotating the rotary drive member (92)

The rotary drive member (92) is operated by the remote adjustment means (52).
When rotates, the enlarged-diameter chamber forming member (64) relatively rotates with respect to the nozzle member (56). Since the enlarged-diameter chamber forming member (64) is screwed to the nozzle member (56), the relative rotation with respect to the nozzle member (56) causes the axial direction, that is, the front-back direction nozzle member to rotate.
The relative position with respect to (56) changes, and as a result, the distance between the jet interface (98) at the throttle opening (68) and the periphery of the throttle opening (68) changes.

According to another cavitation bubble type liquid submerged nozzle device (42) of the present invention, the vertical cross-sectional profile of the peripheral portion of the throttle opening (68) is formed as a curved surface that is convex inward in the radial direction.

The liquid (22) entering the large diameter chamber (72) around the peripheral edge of the aperture opening (68) by forming the peripheral edge of the aperture opening (68) as a curved surface that is convex inward in the radial direction. As a result, the generation state of the cavitation bubbles (100) in the expansion chamber (72) is also improved.

[0017]

Embodiments of the present invention will be described with reference to the drawings. FIG. 3 is an overall configuration diagram of the cavitation bubble type cleaning / peeling apparatus 10. The motor 12 is powered 14
It is driven by electric power from High pressure pump 16 is a motor
It is arranged close to 12 and is driven by rotational power transmitted from the motor 12 via a belt 18. The liquid supply tank 20 stores a liquid 22 which is, for example, water, the strainer 24 is located near the bottom of the liquid supply tank 20, the high-pressure pump 16 is connected to the strainer 24 via a suction pipe 26, and a suction port. The liquid 22 in the liquid supply tank 20 is sucked from the strainer 24. Pressure gauge 28 is a high pressure pump
It is connected to the 16 discharge ports and measures the discharge pressure of the high-pressure pump 16. A pressure regulating device 30 capable of adjusting the pressure regulation value is connected to the discharge port of the high-pressure pump 16 and the liquid 22 from the discharge port of the high-pressure pump 16 is
And send it to the high pressure hose 32,
22 is returned to the liquid supply tank 20 via a residual liquid hose 34.

The cleaning tank 36 stores a liquid 38, for example, water. The liquid 22 in the liquid supply tank 20 described above is generally the same as the liquid 38, but may be different from the liquid 38. The drain cock 40 is disposed below the bottom wall of the cleaning tank 36, and is opened when the liquid 38 is discharged from the cleaning tank 36. Nozzle device
42 is provided with a lance 44 which is submerged at an appropriate depth in the liquid 38 of the washing tank 36 and is linear in the horizontal direction. Lance 44
The support member 46 provided horizontally on the side wall of the cleaning tank 36 is movably supported in the axial direction. The work 48 is attached to the lower end of the operation stick 50, and is submerged in the liquid 38 of the cleaning tank 36 so as to face the nozzle device 42 from the front during processing such as a cleaning operation. The operation stick 50 extends in the vertical direction, is movable in the vertical direction, and is rotatable around a vertical line. The work 48 can be made to face any part of the side surface to the nozzle device 42 by the vertical movement of the operation stick 50 and the rotation around the vertical line. The rotating handle 52 and the pressure gauge 54 are attached to the upper portion on the outer surface of the side wall of the cleaning tank 36.

FIG. 1 is a longitudinal sectional view of the nozzle device 42. The nozzle body 56 has a rear end peripheral portion mounted on the inner periphery of the front end of the lance 44 (FIG. 3) by screwing, and a passage 58 as a cylindrical hole extending from the rear end to the front end along a horizontal line. The tapered portion 60 has a diameter gradually decreasing toward the front, and an orifice 62 which is opened at the front end face.

FIG. 2 is a longitudinal sectional view of the cap 64. The screw hole 102 is opened at the rear end face of the cap 64 so that the cap 64
Formed within. The annular overhanging edge 66 is
Protrudes radially inward at the front end of the cap 64 so that the front end of the cap 64 is narrowed. The vertical cross-sectional profile of the peripheral edge of the annular overhanging edge 66 is a circular arc that is convex inward in the radial direction. Circular window
Reference numeral 68 is defined on the radially inner side of the annular overhanging edge 66 and communicates with the screw hole 102, and connects the front of the cap 64 and the screw hole 102 to each other. In FIG. 2, d is the diameter of the circular window 68.

In FIG. 1, a cap 64 is a nozzle body.
A screw hole 102 (FIG. 2) is screwed into a screw groove 70 at the front end of the nozzle body 56. Diameter. The through hole 74 is formed in the nozzle body 56 in parallel with the center line of the nozzle body 56, and has a front end opening at the front end face of the nozzle body 56. The side hole 76 is formed by being dug down from the upper surface of the nozzle body 56 and communicates with the rear end of the through hole 74 at the bottom. Pressure detection hose
Reference numeral 78 denotes one end communicating with the side hole 76 by being fixed to the nozzle body 56 by the nut 80, the other end communicating with the pressure gauge 54 (FIG. 3), and transmitting the pressure of the enlarged diameter chamber 72 to the pressure gauge 54. . The flexible shaft 82 has a coating portion at one end fixed to a lower portion of the nozzle body 56 with a set screw 84, and the other end connected to the rotary handle 52 (FIG. 3). The gear drive shaft 86 is supported at a lower portion of the nozzle body 56 so as to be rotatable around a center line at a base end portion, and has a gear portion 92 at a tip end portion. Retaining screw 88
The front end of the gear drive shaft 86 is fitted into an annular groove at the base end of the gear drive shaft 86 to prevent rotation of the gear drive shaft 86 with respect to the nozzle body 56, while preventing the gear drive shaft 86 from coming off from the nozzle body 56. The universal joint 90 connects the shaft of the flexible shaft 82 and the gear drive shaft 86. The gear portion 94 is formed on the outer peripheral portion of the cap 64 and meshes with the gear portion 92.

The high-pressure liquid jet 104 from the orifice 62 forms a jet core 96 near the orifice 62 while the other liquid jet 104
A jet interface 98 is formed between the nozzle and the nozzle 38, and the jet flows toward the front of the nozzle device 42 through the circular window 68. The diameter of the cross section of the high-pressure liquid jet 104 gradually increases as the distance from the orifice 62 increases. Liquid 38 by high-pressure liquid jet 104 at jet interface 98
The cavitation bubbles 100 are generated by the shearing of the cavities, and the cavitation bubbles 100 are caught in the high-pressure liquid jet 104 and conveyed. In FIG. 1, α is the divergence angle of the high-pressure liquid jet 104, and δ is the jet interface 98 at the annular overhanging edge 66.
And the distance between the peripheral edge of the annular overhanging edge 66.

With the operation of the motor 12, the high-pressure pump 16 is driven to rotate, and the liquid 22 in the liquid supply tank 20 is sucked by the high-pressure pump 16, discharged from the high-pressure pump 16 to the high-pressure hose 32, and sent to the nozzle device 42. Supplied. The high-pressure liquid 22 supplied to the nozzle device 42 advances to the tapered portion 60 via the lance 44 and the passage 58, and the speed is increased by reducing the flow cross-sectional area in the tapered portion 60. Is jetted as a high-pressure liquid jet 104. The jet velocity of the high-pressure liquid jet 104 from the orifice 62 is about 100 to 300 m / s, and the jet pressure is about 50 to 500 kgf / square cm. Cavitation bubbles 100 are generated by the high-pressure liquid jet 104,
The cavitation bubble 100 is conveyed while being engulfed in the high-pressure liquid jet 104, hits the work 48, and performs cleaning, peeling, hanging, and the like of the work 48 by an impact force at the time of disappearance. With the sending of the high-pressure liquid jet 104 forward from the circular window 68, the pressure in the expanding chamber 72 decreases, and the liquid 38 in front of the cap 64 becomes
The gas is supplied to the inside of the large-diameter chamber 72 around the peripheral edge of the annular overhanging edge 66. Since the peripheral edge of the annular overhanging edge 66 has an arc-shaped vertical cross section that protrudes inward in the radial direction, the introduction of the liquid 38 into the enlarged-diameter chamber 72 around the liquid 38 is facilitated.
During the processing of the work 48, the operation stick 50 appropriately moves up and down and rotates around a vertical line, and furthermore, the lance 44 is supported by the supporting member.
With respect to the workpiece 48, the position of the workpiece 48 to which the high-pressure liquid jet 104 is applied is appropriately changed in the vertical and circumferential directions, and the distance from the nozzle device 42 is appropriately increased or decreased.

The pressure adjustment value by the pressure adjustment device 30 is changed according to the condition of the work 48 and the like, and the high pressure liquid jet from the orifice 62 is changed.
Change the injection pressure of 104. The change in the injection pressure of the high-pressure liquid jet 104 results in a change in the length of the jet core 96, and accordingly,
α and δ change, and the generation state of the cavitation bubble 100 changes. When the rotary handle 52 is rotated, the flexible shaft 82 transmits the rotational power of the rotary handle 52 to the gear drive shaft 86, and the gear 92 rotates. The cap 64 is rotated relative to the nozzle body 56 by the rotation of the gear portion 94 by the gear portion 92, the screwing position of the screw hole 102 in the screw groove 70 is changed, and the relative position to the nozzle body 56 in the front-back direction is changed. . As a result, δ changes. Thus, the axial position of the cap 64 with respect to the nozzle body 56 is adjusted by the rotating handle 52 so that δ becomes a value that efficiently generates the cavitation bubbles 100 in the enlarged-diameter chamber 72.

When the cavitation bubbles 100 are efficiently generated, the pressure in the expanding chamber 72 has a minimum value. Therefore, the operator, without directly looking at the state of the cavitation bubble 100 from the nozzle device 42, rotates the rotary handle 52 forward and reverse while looking at the display of the pressure gauge 54, and the display value of the pressure gauge 54 becomes the minimum value. Then, by stopping the rotation of the rotary handle 52, δ can be adjusted to an optimum value.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a nozzle device.

FIG. 2 is a longitudinal sectional view of a cap.

FIG. 3 is an overall configuration diagram of a cavitation bubble type cleaning / peeling apparatus.

[Explanation of symbols]

22 , 38 liquid 42 Nozzle device (cavitation bubble type submerged nozzle device) 52 Rotary handle (remote adjustment means) 54 Pressure gauge (pressure detection means) 56 Nozzle body (nozzle member) 62 Orifice (injection hole) 64 Cap (expanding chamber) Forming member) 68 Circular window (diaphragm opening) 72 Enlarged diameter chamber 92 Gear part (rotary driving member) 96 Jet core 98 Jet interface 100 Cavitation bubble 104 High-pressure liquid jet (jet)

Claims (6)

(57) [Claims] 1. An expanding chamber (72) having a front opening through a throttle opening (68) and having a larger diameter than the injection hole (62) is arranged in front of the injection hole (62), Cavitation bubble type submerged nozzle device (4) for injecting liquid (22) forward from the injection hole (62)
In the adjusting method of (2), changing the distance between the jet interface (98) at the throttle opening (68) and the periphery of the throttle opening (68) to adjust the generation state of the cavitation bubbles (100). A method for adjusting a cavitation bubble type submerged nozzle device, which is characterized by the following. 2. A nozzle member (56) having an injection hole (62) for injecting a liquid (22), and (b) an injection hole (62) having a diameter larger than that of the injection hole (62). A diameter expansion chamber (72) that is disposed in front of the nozzle member (56) and opens forward through a throttle opening (68), and is relatively displaceable in the front-rear direction with respect to the nozzle member (56). A cavitation bubble type submerged nozzle apparatus, comprising: a chamber forming member (64). 3. The cavitation bubble type submerged nozzle device according to claim 2, further comprising: (c) a pressure detecting means (54) for detecting a pressure in the enlarged diameter chamber (72). . 4. A relative position of the enlarged-diameter chamber forming member (64) with respect to the nozzle member (56) in the front-rear direction outside the liquid (38) in which the nozzle member (56) is submerged. The cavitation bubble type submerged nozzle apparatus according to claim 2 or 3, further comprising a remote adjustment means (52) for adjusting the pressure. (E) the enlarged-diameter chamber forming member (64) fitted and screwed into the nozzle member (56), and (f) the nozzle member (5).
(G) a rotary drive member (92) for relatively rotating the enlarged chamber forming member (64), and (g) the remote adjustment means (52) for rotating the rotary drive member (92). 5. The cavitation bubble type submerged nozzle device according to claim 4, wherein: 6. The cavitation according to claim 2, wherein a vertical cross-sectional profile of a peripheral portion of the stop aperture (68) is formed as a curved surface that is convex inward in a radial direction. Bubble type submerged nozzle device.