JP2016123918A - Discharge unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent crack on a thin plate part on which a hole is formed, and secure insulation of portions other than the hole.SOLUTION: A partition part (40) comprises: a partition plate body (60a) attached to a water tank (20); an elastic member (80) having elastic modulus lower than that of the partition plate body (60a), and fixed to the partition plate body (60a); and a thin-plate state thin plate part (45) on which a hole (46) is formed, and held by the elastic member (80).SELECTED DRAWING: Figure 10

Description

    The present invention relates to a discharge unit.

    Conventionally, a discharge unit for water treatment is known. In the discharge unit described in Patent Document 1, the first electrode and the second electrode connected to the high voltage generation unit are immersed in the water tank. The interior of the water tank is partitioned by a partition into a first chamber in which the first electrode is submerged and a second chamber in which the second electrode is submerged. A fine hole is formed in the partition part, and both chambers communicate with each other through this hole.

    When a potential difference is applied from the high voltage generator to the pair of electrodes, a current flows through the hole, and the current density in the hole increases. Thereby, Joule heat is generated in the hole, and water in the hole is vaporized. As a result, bubbles are generated in the holes, and the first chamber and the second chamber are divided by the bubbles. Then, at the gas-liquid interface of the bubbles, the interface on the first chamber side and the interface on the second chamber side are respectively pseudo electrodes, and discharge is performed between the interfaces. Along with this discharge, purification components (such as sterilization factors) such as hydroxyl radicals are generated in the water, and the water in the water tank is purified.

JP 2011-72906 A

    In the discharge unit disclosed in Patent Document 1, a very fine hole (for example, a hole diameter of about 50 μm) is formed in the partition portion, and discharge is performed in the vicinity of the hole. The plate part forming the hole should be as thin as possible. This is because if the thickness of the plate portion increases, it becomes difficult to process fine holes.

    On the other hand, when the plate portion is made thinner, the rigidity of the plate portion (thin plate portion) is lowered. As a result, there is a problem that the plate portion is broken when the discharge unit is used. Specifically, in the partition portion, a structure in which the plate portion is held by a relatively thick insulating partition plate main body can be considered. However, the discharge unit has a problem that bending stress or the like acts on the support portion of the plate portion due to minute vibrations generated in water due to discharge, and the plate portion is broken.

    This invention is made | formed in view of this point, The objective is preventing the crack of the thin-plate part in which a hole is formed, and ensuring the insulation of parts other than a hole.

    The first invention includes a high voltage generator (31), a first electrode (32) and a second electrode (33) to which a potential difference is applied from the high voltage generator (31), a water tank (20), The water tank (20) is divided into a first chamber (27) in which the first electrode (32) is submerged and a second chamber (28) in which the second electrode (33) is submerged, and the first electrode (32 ) And the second electrode (33) and an insulating partition (40) in which fine holes (46) are formed, and the high voltage generator (31) to the first electrode (32). ) And the second electrode (33), by applying a potential difference to the discharge unit configured to generate a bubble from the hole (46) and discharge in the bubble, the partition (40 ) A partition plate body (60a) attached to the water tank (20), and an elastic member (80) having a lower elastic modulus than the partition plate body (60a) and fixed to the partition plate body (60a). Are holes (46) is formed, characterized in that it comprises a said thin plate-like thin plate (45) held by the elastic member (80).

    In the first invention, a potential difference is applied from the high voltage generating part (31) to the first electrode (32) and the second electrode (33), so that the inside of the hole (46) formed in the thin plate part (45). Current density increases, water is vaporized by Joule heat in the hole (46), and bubbles are generated. The bubbles divide the first chamber (27) and the second chamber (28), and discharge is performed in the bubbles. When this discharge is performed, minute vibrations are generated in water. However, the thin plate portion (45) is held by the partition plate body (60a) via the elastic member (80) having a lower elastic modulus than the partition plate body (60a). For this reason, even if minute vibration propagates to the thin plate portion (45), the elastic member (80) vibrates together with the thin plate portion (45), so that the stress acting on the holding portion of the thin plate portion (45) is reduced. Since the partition portion (40) has an insulating property, it is possible to ensure insulation of portions other than the hole (46).

    In a second aspect based on the first aspect, the partition plate body (60a) has two partition plates (61, 71) that are divided in the thickness direction of the partition plate body (60a). Each dividing plate (61, 71) has a fitting portion (65, 75) in which a part of the elastic member (80) is fitted and a through hole (41) communicating with the hole (46) is formed therein. ) And are joined together so as to sandwich the elastic member (80) inside the two fitting parts (65, 75).

    In the second invention, the divided plates (61, 71) are joined in a state where the elastic member (80) is fitted between the fitting portions (65, 75) of the two divided plates (61, 71). Is done. At this time, the through hole (41) formed in the fitting part (65, 75) and the hole (46) of the thin plate part (45) are aligned. In the partition plate body (60a) in a state where the divided plates (61, 71) are joined, the elastic member (80) is held between the pair of fitting portions (65, 75) and the thin plate portion (45 ) Hole (46) and through hole (41) are in communication.

    In a third aspect based on the second aspect, the elastic member (80) is formed in an annular shape, and an outer peripheral portion of the thin plate portion (45) is formed on the inner peripheral edge (80a) of the elastic member (80). An embedded portion (83) in which (45a) is embedded is formed.

    In the third invention, the elastic member (80) is formed in an annular shape, and the embedded portion (83) is formed in the inner peripheral edge (80a) thereof. The thin plate portion (45) has its outer peripheral portion (45a) embedded in the embedded portion (83), so that its entire periphery is held by the elastic member (80).

    In a fourth aspect based on the third aspect, the thin plate portion (45) is formed in a disc shape, the elastic member (80) is formed in an annular shape, and the embedding of the elastic member (80) is performed. The portion (83) is formed in an annular shape in which the thin plate portion (45) is embedded so that the axial center of the elastic member (80) and the axial center of the thin plate portion (45) coincide with each other. And

    In the fourth invention, the annular embedded portion (83) is formed on the inner peripheral edge (80a) of the annular elastic member (80). The outer peripheral portion (45a) of the disk-shaped thin plate portion (45) is embedded in the embedded portion (83) so that the axis of the thin plate portion (45) coincides with the axis of the elastic member (80). The Thereby, the distance from the outer periphery end of a thin-plate part (45) to the outer periphery end of an elastic member (80) becomes equal over the perimeter.

    According to a fifth invention, in the fourth invention, the thin plate portion (45) is located around the through hole (41) of the divided plate (61, 71) and coaxially with the through hole (41). A trapezoidal cone (66, 76) is formed so that the outer diameter decreases as it approaches the hole (46), and the trapezoidal cone of the split plate is formed at the end of the elastic member (80) in the thickness direction. An annular tapered surface (81, 82) is formed along the inclined surface (66a, 76a) of the portion (66, 76).

    In the fifth invention, a trapezoidal conical portion (66, 76) whose outer shape becomes smaller as it approaches the hole (46) is formed around the through hole (41) of the dividing plate (61, 71). In contrast, the elastic member (80) is formed with an annular tapered surface (81, 82) along the inclined surfaces (66a, 76a) of the trapezoidal cone (66, 76). When the elastic member (80) is fitted into the fitting portion (65,75) of the dividing plate (61,71), the elastic member (80) has a tapered surface (81,82) with a trapezoidal cone (66,76). ) Is fitted into the trapezoidal cone (66, 76) along the inclined surface (66a, 76a). Thereby, even if the position of the elastic member (80) is slightly shifted in the thickness direction, the axis of the elastic member (80) and the axis of the trapezoidal cone (66, 76) are hardly shifted. A through hole (41) is located in the axial center of the trapezoidal cone (66, 76). On the other hand, a hole (46) is formed in the axial center of the elastic member (80). Therefore, in the assembled state of the partition plate main body (60a), the through hole (41) of the split plate (61, 71) and the hole (46) of the thin plate portion (45) are positioned substantially coaxially.

    In a sixth aspect based on the fifth aspect, a gap (G) is formed between the distal end surface (66b, 76b) of the trapezoidal cone portion (66, 76) and the thin plate portion (45). It is characterized by that.

    In the sixth invention, even if the elastic member (80) is inserted into the trapezoidal cone portion (66,76), the gap (G1, G2) is formed between the trapezoidal cone portion (66,76) and the thin plate portion (45). Is formed. That is, the thin plate portion (45) and the divided plates (61, 71) are not in contact (non-contact). For this reason, the vibration of the dividing plates (61, 71) does not propagate directly to the thin plate portion (45).

    According to a seventh invention, in any one of the second to sixth inventions, the through hole (41) of each of the divided plates (61, 71) is directed toward the opening end opposite to the hole (46). It has the enlarged diameter part (64,74) which expands an internal diameter, It is characterized by the above-mentioned.

    In the seventh invention, the enlarged diameter portion (64, 74) is formed in the through hole (41). The enlarged diameter portion (64, 74) has an inner diameter enlarged toward the opening end opposite to the hole (46). If bubbles are generated from the holes (46) during discharge, the bubbles may accumulate inside the through holes (41). However, in the present invention, since the enlarged diameter portion (64, 74) is formed in the through hole (41), the bubbles generated in the hole (46) can be quickly discharged to the outside of the through hole (41).

    According to 1st invention, since a thin-plate part (45) is hold | maintained at a partition plate main body (60a) via an elastic member (80), a thin-plate part (45) will be cracked with the vibration which arises at the time of discharge. Can be suppressed. Since the partition part (40) has an insulating property, it is possible to ensure an insulating property of a portion other than the hole (46).

    According to the second aspect of the invention, the hole (46) of the thin plate portion (45) and the through hole (41) of the partition plate body (60a) are easily aligned, and the inside of the partition plate body (60a) is elastic. The thin plate portion (45) can be held via the member (80). For example, when the thin plate portion (45) and the partition plate body (60a) are integrally processed by insert molding, stress is applied to the holding portion of the thin plate portion (45) due to thermal contraction of the partition plate body (60a). May occur. Therefore, the thin plate portion (45) may be broken during the processing of the partition portion (40). In contrast, in the present invention, since the elastic member (80) and the thin plate portion (45) are sandwiched and joined between the two divided plates (61, 71), the thin plate portion ( 45) will not break.

According to the third invention, since the elastic member (80) covers the outer peripheral portion (45a) of the thin plate portion (45), local stress is generated in the outer peripheral portion (45a) of the thin plate portion (45). It is possible to prevent the thin plate portion (45) from cracking. Further, by embedding the thin plate portion (45) inside the elastic member (80), it is possible to reliably prevent water from leaking at this portion and to ensure insulation.

    According to the fourth invention, since the distance from the outer peripheral end of the thin plate portion (45) to the outer peripheral end of the elastic member (80) is equal, the stress generated in the thin plate portion (45) can be made uniform, and the thin plate portion (45 ) Can be more reliably prevented.

    In the fifth aspect of the invention, the through hole (41) of the divided plate (61, 71) and the hole (46) of the thin plate portion (45) can be reliably communicated, and the discharge in the desired bubble can be stabilized. Can be done.

    In the sixth invention, the split plate (61, 71) and the thin plate portion (45) are brought into a non-contact state to prevent the vibration of the split plate (61, 71) from propagating to the thin plate portion (45). And cracking of the thin plate portion (45) can be reliably avoided.

    In the seventh invention, by forming the enlarged diameter portion (64, 74) in the through hole (41), the bubbles generated in the hole (46) can be quickly discharged, and the bubbles are discharged only in the vicinity of the hole (46). Can be stored. As a result, stable discharge can be continuously performed between the two gas-liquid interfaces sandwiching the hole (46). In addition, since the enlarged diameter part (64, 74) is formed not on the thin plate part (45) but on the divided plate (61, 71) having a small thickness constraint, the enlarged diameter part (64, 74) can also be processed. It is relatively easy.

FIG. 1 is a configuration diagram illustrating a schematic configuration of a discharge unit according to the embodiment. FIG. 2 is a perspective view of the water tank and the partition unit according to the embodiment. FIG. 3 is a vertical cross-sectional view (a cross-sectional view taken along line III-III in FIG. 2) of the partition portion according to the embodiment. FIG. 4 is a front view of the partition portion according to the embodiment, and is a view taken along the arrow IV in FIG. 3. FIG. 5 is a partial vertical cross-sectional view (cross-sectional view taken along the line V-V in FIG. 4) of the partition portion according to the embodiment. FIG. 6 is a partial vertical cross-sectional view (a cross-sectional view taken along line VI-VI in FIG. 4) of the partition portion according to the embodiment. FIG. 7 is a partial longitudinal sectional view (sectional view taken along line VII-VII in FIG. 4) of the partition portion according to the embodiment. FIG. 8 is an exploded perspective view of the removable partition plate. FIG. 9 is a front view of the second divided plate and the elastic member according to the embodiment (as viewed from the arrow VIIII in FIG. 8). FIG. 10 is an enlarged vertical cross-sectional view of the main part of FIG. 3, and bubbles are represented by two-dot chain lines. FIG. 11 is a front view for explaining the assembly process of the partition plate. FIG. 12 is a view corresponding to FIG. 5 for explaining the assembly process of the partition plate. FIG. 13 is a view corresponding to FIG. 6 for explaining the assembly process of the partition plate.

    Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its application, or its use.

<< Embodiment of the Invention >>
Embodiment of this invention is the discharge unit (10) for water treatment which purifies water. As shown in FIG. 1, the discharge unit (10) includes a water tank (20), a partition (40), and a discharge device (30). The discharge unit (10) applies a potential difference from the high voltage generation part (31) of the discharge device (30) to the first electrode (32) and the second electrode (33), so that the hole ( 46), bubbles (B) are generated, and discharge is performed in the bubbles (B).

<Water tank>
The water tank (20) is made of an insulating resin material. As shown in FIG. 2, the water tank (20) is formed in a hollow box shape with the upper side opened. The water tank (20) has a bottom wall (22), a front wall (23), a rear wall (24), a first side wall (25), and a second side wall (26). The front wall (23) extends vertically from the front end of the bottom wall (22), and the rear wall (24) extends vertically from the rear end of the bottom wall (22). The first side wall (25) extends between the left end of the front wall (23) and the left end of the rear wall (24). The second side wall (26) extends between the right end portion of the front wall (23) and the right end portion of the rear wall (24).

    Water is supplied to the water tank (20) from a water supply unit (not shown). The water purified in the water tank (20) is discharged from the drainage section (not shown) to the outside of the water tank (20).

<Outline of the partition>
As shown in FIG.1 and FIG.2, a partition part (40) is formed in the substantially plate shape extended perpendicularly | vertically from the bottom face (22a) of a water tank (20). A partition part (40) is arrange | positioned in parallel with a front wall (23) and a rear wall (24). A partition part (40) is arrange | positioned in the intermediate part of the longitudinal direction (front-back direction) of a water tank (20). The partition (40) divides the interior of the water tank (20) into two chambers (27, 28) in the front-rear direction. Of these chambers (27, 28), the front side constitutes the first chamber (27) and the rear side constitutes the second chamber (28).

    As shown also in FIG. 3, the partition part (40) is formed with a through hole (41) that penetrates the partition part (40) in the thickness direction (front-rear direction). A thin plate portion (45) is located inside the through hole (41). Fine holes (46) are formed in the thin plate portion (45). The first chamber (27) and the second chamber (28) communicate with each other through the hole (46). The detailed structure of the partition part (40) will be described later.

[Discharge device]
As shown in FIG. 1, the discharge device (30) includes a high voltage generator (31) and a pair of electrodes (32, 33) electrically connected to the high voltage generator (31). Yes.

    The high voltage generator (31) applies a high voltage to the pair of electrodes (32, 33). Specifically, the high voltage generator (31) applies an alternating waveform voltage in which positive and negative are switched with respect to the pair of electrodes (32, 33). It is preferable that the duty ratio of the alternating waveform (square wave) has the same ratio between the positive electrode side and the negative electrode side. The voltage applied from the high voltage generator (31) to the pair of electrodes (32, 33) is not limited to a square wave, and may be, for example, a sine wave.

    The pair of electrodes (32, 33) is made of a plate-like metal material having high corrosion resistance. The pair of electrodes (32, 33) includes a first electrode (32) and a second electrode (33). The first electrode (32) is immersed in the water of the first chamber (27). The second electrode (33) is immersed in the water of the second chamber (28). These electrodes (32, 33) are arranged with a predetermined distance from the partition (40).

<Detailed structure of partition>
The detailed structure of a partition part (40) is demonstrated referring FIGS. 1-11. The partition (40) includes a fixed partition (50), a detachable partition (60), and a seal (90).

[Fixed partition plate (50)]
As shown in FIG. 4, the fixed partition plate (50) is fixed to the water tank (20). The fixed partition plate (50) is made of an insulating resin material. The fixed partition plate (50) is fixed to the inner side surfaces of the first side wall (25) and the second side wall (26) and the bottom surface (22a) of the bottom wall (22). A mounting recess (51) that is recessed from the upper end of the partition (40) to the bottom (22a) of the water tank (20) is formed at the center in the width direction (left-right direction) of the fixed partition plate (50). The The inner edge (52) of the mounting recess (51) includes a lower inner wall (53) (lower edge) formed on the lower side and a first inner wall (54) formed on one side (left side) in the width direction. ) (One side edge) and the second inner wall (55) (the other side edge) formed on the other side (right side) in the width direction. The mounting recess (51) is configured such that the distance between the first inner wall (54) and the second inner wall (55) becomes narrower as it goes downward. That is, the mounting recess (51) is formed in a wedge shape (trapezoidal shape) whose upper side is larger than the lower side in front view.

[Lower inner wall]
The lower inner wall portion (53) extends in the left-right direction (the width direction of the partition portion (40)) along the bottom surface (22a) of the water tank (20). The shape of the vertical cross section (the VV line cross section of FIG. 4) of the lower inner wall portion (53) is the same throughout. As shown in FIGS. 3 and 5, the lower inner wall portion (53) has a lower base portion (53a) and a lower convex portion (53b).

    The lower base (53a) is fixed to the bottom surface (22a) of the water tank (20). The longitudinal section of the lower base portion (53a) and the lower convex portion (53b) is rectangular. The front-rear width of the lower convex part (53b) is smaller than the front-rear width of the lower base part (53a). The lower convex portion (53b) protrudes in the direction (upward) toward the removable partition plate (60) from the intermediate portion in the width direction (left-right direction) of the upper surface of the lower base portion (53a). On the upper surface of the lower base portion (53a), a first step surface (S1) is formed on one side (left side) in the width direction of the lower convex portion (53b), and a second step surface (S2) is formed on the other side (right side). Is done.

[First inner wall]
The first inner wall portion (54) extends obliquely from the upper end of the mounting recess (51) toward the lower right. The shape of the vertical cross section (cross section taken along the line VI-VI in FIG. 4) of the first inner wall portion (54) is the same throughout. As shown in FIG. 6, the first inner wall portion (54) has a first base portion (54a) and a first convex portion (54b). The first base portion (54a) is continuous with the left portion of the fixed partition plate (50). The longitudinal section of the first base part (54a) and the first convex part (54b) is rectangular. The front-rear width of the first convex part (54b) is smaller than the front-rear width of the first base part (54a). A 1st convex part (54b) protrudes in the direction (right side) which goes to the attachment / detachment partition plate (60) side from the intermediate part of the width direction (front-back direction) of the inner surface (right surface) of a 1st base part (54a). On the right surface of the first base portion (54a), there is a third step surface (S3) on one side (front side) in the width direction of the first convex portion (54b), and a fourth step surface (S4) on the other side (rear side). It is formed.

[Second inner wall]
The second inner wall (55) extends obliquely from the upper end of the mounting recess (51) toward the lower left. The shape of the longitudinal section of the second inner wall portion (55) (the section taken along line VII-VII in FIG. 4) is the same throughout. As shown in FIG. 7, the second inner wall portion (55) has a second base portion (55a) and a second convex portion (55b). The second base portion (55a) is continuous with the right side portion of the fixed partition plate (50). The longitudinal section of the second base part (55a) and the second convex part (55b) is rectangular. The width before and after the second convex portion (55b) is smaller than the width before and after the second base portion (55a). The 2nd convex part (55b) protrudes in the direction (left side) which goes to the attachment / detachment partition plate (60) side from the intermediate part of the width direction (front-back direction) of the inner surface (left side) of the 2nd base part (55a). . On the right surface of the second base portion (55a), there is a fifth step surface (S5) on one side (front side) in the width direction of the second convex portion (55b), and a sixth step surface (S6) on the other side (rear side). It is formed.

(Detachable partition plate)
As shown in FIG. 4, the detachable partition plate (60) is formed along the inner edge (52) of the mounting recess (51) and is configured to be inserted into the mounting recess (51). The removable partition plate (60) has a partition plate body (60a), an elastic member (80), and a thin plate portion (45).

    The partition plate body (60a) is made of an insulating resin material, and constitutes the body of the removable partition plate (60). As shown in FIGS. 3 and 8, the partition plate main body (60a) is configured by joining two divided plates (61, 71) divided in the thickness direction of the partition plate main body (60a). . The two divided plates (61, 71) are composed of a first divided plate (61) located on the front side and a second divided plate (71) located on the rear side. The basic structure of the first divided plate (61) and the second divided plate (71) is the same.

[First division board]
The first divided plate (61) has an inverted trapezoidal (wedge shape) outer plate part (62) whose upper side is larger than the lower side, and an inverted trapezoidal shape (wedge shape) that is slightly smaller than the outer plate part (62). And a plate portion (63). The inner plate portion (63) is integrally formed on the rear surface of the outer plate portion (62) so as to form a step on the entire circumference thereof.

    The outer plate portion (62) is positioned in front of the inner edge portion (52) of the mounting recess portion (51) and projects outward from the inner edge portion (52) of the mounting recess portion (51). The lower end portion (62a) of the outer plate portion (62) projects downward from the upper end of the lower inner wall portion (53) of the mounting recess (51). As shown in FIGS. 3 and 5, the lower surface of the lower end portion (62a) of the outer plate portion (62) and the lower surface of the lower base portion (53a) of the mounting recess (51) are the bottom surface (22a ). The lower end part (62a) of the outer plate part (62) is separated from the lower inner wall part (53) of the mounting recess (51).

    As shown in FIG. 6, the left end portion (62b) of the outer plate portion (62) protrudes to the left from the right end of the first inner wall portion (54) of the mounting recess (51). The left end portion (62b) of the outer plate portion (62) is separated from the first inner wall portion (54) of the mounting recess (51). As shown in FIG. 7, the right end portion (62c) of the outer plate portion (62) protrudes to the right from the left end of the second inner wall portion (55) of the mounting recess (51). The left end portion (62c) of the outer plate portion (62) is separated from the second inner wall portion (55) of the mounting recess (51).

    As shown in FIGS. 3 and 4, an enlarged diameter portion (64) is formed in a portion slightly below the center of the outer plate portion (62). The enlarged diameter portion (64) is formed of a trapezoidal conical hole whose inner diameter is increased toward the opposite side (front side) of the hole (46) of the thin plate portion (45).

    As shown in FIGS. 3 and 10, a fitting portion (65) is formed on the inner side surface of the inner plate portion (63) (a portion slightly below the center of the rear surface. The fitting portion (65)). Is composed of a flat cylindrical recess recessed from the inner surface (rear surface) of the inner plate portion (63) toward the outer plate portion (62) side (front side) at the center of the fitting portion (65). Is formed with a trapezoidal cone (66) whose outer diameter decreases as it approaches the hole (46) side (rear side), that is, the trapezoidal cone (66) is inclined toward the inner center. An inclined surface (66a) is formed, and the axis of the trapezoidal cone portion (66) coincides with the center of the fitting portion (65) and the center of the hole (46). A horizontal hole (67) extending in the thickness direction of the inner plate part (63) passes through the trapezoidal cone part (66), and the horizontal hole (67) is located at the back of the enlarged diameter part (64). It is continuous with the open end on the side (rear side). The horizontal hole (67) is a cylindrical hole having an inner diameter substantially the same as the open end on the back side of the enlarged diameter portion (64).

    As shown in FIG. 3, in the inner plate portion (63), the thickness d1 before and after the bottom surface of the fitting portion (65) to the front end surface (rear end surface) of the outer peripheral side portion of the fitting portion (65) is It is larger than the thickness d2 before and after the bottom surface of the fitting portion (65) to the front end surface (66b) (rear end surface) of the trapezoidal cone portion (66).

    A closed loop ring groove (68) that is continuous over the entire circumference is formed at the outer edge of the inner plate (63). The ring groove (68) is formed in a portion substantially continuous with the inner side surface (rear surface) of the outer plate portion (62) in the outer edge portion of the inner plate portion (63). The cross section perpendicular to the extending direction of the ring groove (68) is formed in a substantially semicircular arc shape. The horizontal hole (67) and the enlarged diameter portion (64) constitute a part of the through hole (41).

[Second division board]
As shown in FIG. 3, the basic structure of the second divided plate (71) is the same except that it is symmetrical with the first divided plate (61) in the front-rear direction. That is, the second divided plate (71) has the outer plate portion (72) and the inner plate portion (73) in the same manner as the first divided plate (61). The outer plate portion (72) is formed with an enlarged diameter portion (74), and the inner plate portion (73) is formed with a fitting portion (75), a trapezoidal cone portion (76), and a lateral hole (77). The The horizontal hole (77) and the enlarged diameter portion (74) constitute a part of the through hole (41). Since the structure of each part is the same as that of the first divided plate (61), detailed description thereof is omitted.

[Elastic member]
The elastic member (80) is made of an insulating and elastic resin material. The elastic member (80) is made of a flexible material having a lower elastic modulus than the partition plate body (60a). The elastic member (80) of the present embodiment is made of a silicon material. The elastic member (80) is formed in a slightly flat annular shape in the front-rear direction (see FIG. 8). As shown in FIG. 3, the elastic member (80) has a substantially half of the front side fitted into the fitting portion (65) of the first divided plate (61), and a substantially half of the rear side thereof is the second divided plate. Fits into the fitting part (75) of (71). A cone along the inclined surface (66a) of the trapezoidal cone (66) of the first divided plate (61) is formed at the front end of the inner peripheral edge (80a) of the elastic member (80) opposite to the hole (46). A first tapered surface (81) having a shape is formed. The axis of the first taper surface (81) coincides with the axis of the trapezoidal cone (66) of the first divided plate (61) and the axis of the hole (46) (dashed line P in FIG. 8). Yes. Along the inclined surface (76a) of the trapezoidal conical portion (76) of the second divided plate (71) at the rear end of the inner peripheral edge (80a) of the elastic member (80) opposite to the hole (46) A conical second tapered surface (82) is formed. The axis of the second taper surface (82) coincides with the axis of the trapezoidal cone (76) of the second divided plate (71) and the axis of the hole (46) (dashed line P in FIG. 8). Yes.

    As shown in FIGS. 3 and 10, an annular embedded portion (83) is formed in an intermediate portion in the thickness direction (front-rear direction) of the inner peripheral edge portion (80 a) of the elastic member (80). . In the embedded portion (83), the outer peripheral portion (45a) of the disk-shaped thin plate portion (45) is inserted or fitted. That is, in the removable partition plate (60), the outer peripheral portion (45a) of the thin plate portion (45) is embedded and held inside the elastic member (80). With this configuration, the thin plate portion (45) is held or fixed only to the elastic member (80) and is not held or fixed to the removable partition plate (60).

[Thin plate part]
As shown in FIGS. 3, 8, and 9, the thin plate portion (45) is held inside the elastic member (80). The thin plate portion (45) is a very thin (for example, 0.5 mm) insulating material, and is made of, for example, a ceramic material having excellent insulating properties and heat resistance. The thin plate portion (45) is formed in a disc shape, and its outer peripheral portion (45a) is tightly sandwiched between the inner walls of the embedded portion (83) of the elastic member (80). A very fine hole (46) is formed in the axial center of the thin plate portion (45). The inner diameter of the hole (46) is, for example, 50 μm. The hole (46) is a communication path that allows the first chamber (27) and the second chamber (28) to communicate with each other, and forms a current path between the first electrode (32) and the second electrode (33). The hole (46) is configured to have a very small diameter so that water in the hole (46) is vaporized by Joule heat of current flowing through the hole (46) to generate bubbles.

[Assembly removable partition plate]
As shown in FIG. 8, in the assembly process of the detachable partition plate (60), the elastic member (80) holding the thin plate portion (45) therein is the first divided plate (61) and the second divided plate (71). Between the fitting parts (65, 75). The inner plate portion (63) of the first divided plate (61) and the inner plate portion (73) of the second divided plate (71) are joined together with an adhesive or the like so that the entire area thereof is in close contact. The first tapered surface (81) of the elastic member (80) is in surface contact with the inclined surface (66a) of the trapezoidal conical portion (66) of the first divided plate (61), and the second tapered surface of the elastic member (80). The surface (82) is in surface contact with the inclined surface (76a) of the trapezoidal cone (76) of the second divided plate (71). In this state, when the elastic member (80) is tightly sandwiched between the first divided plate (61) and the second divided plate (71), the axis of each trapezoidal cone (66, 76) and the elastic member The axis of (80) matches. Furthermore, the axis of each lateral hole (67, 77) and the axis of the hole (46) coincide. Thereby, alignment with a hole (46) and a horizontal hole (67,77) can be performed reliably, and a hole (46) and a through-hole (41) can be connected.

[Through hole]
As shown in FIGS. 3 and 10, the through-hole (41) is formed in the assembled / detachable partition plate (60). The through-hole (41) has the enlarged diameter portion (64), the lateral hole (67), the lateral hole (77) of the second divided plate (71), and the enlarged diameter portion (74) on the front side. It is comprised by continuing toward the rear side. The horizontal hole (67) of the first divided plate (61) and the horizontal hole (77) of the second divided plate (71) are continuous in the front-rear direction to form a horizontally long intermediate hole (42). A thin plate portion (45) is disposed at an intermediate portion in the axial direction (front-rear direction) of the intermediate hole (42). The through hole (41) communicates with the thin plate portion (45) through the hole (46). The enlarged diameter portion (64) of the first divided plate (61) constitutes a first enlarged diameter portion that increases the inner diameter toward the outside (front side) of the through hole (41) with respect to the intermediate hole (42). . The enlarged diameter portion (74) of the second divided plate (71) constitutes a second enlarged diameter portion that enlarges the inner diameter toward the outer side (rear side) of the through hole (41) with respect to the intermediate hole (42). To do.

[Each recess]
As shown in FIGS. 3 and 5 to 7, the outer edge of the assembled and detached partition plate (60) has a lower recess (85) and a first recess ( 86), a second recess (87), and an upper recess (88) are formed. The lower recess (85) is formed at the lower edge of the removable partition plate (60). A 1st recessed part (86) is formed in the side edge part of one (left side) of the width direction of a detachable partition plate (60). A 2nd recessed part (87) is formed in the side edge part of the other (right side) of the width direction of a detachable partition plate (60). The upper recess (88) is formed at the upper edge of the removable partition plate (60).

    The lower concave portion (85) is formed between the lower ends of the first divided plate (61) and the second divided plate (71) (see FIG. 5), and extends from the left end to the right end of the removable partition plate (60). It extends horizontally. The first recess (86) is formed between the left end portions of the first split plate (61) and the second split plate (71) (see FIG. 6), and extends from the lower end to the upper end of the removable partition plate (60). It extends diagonally in the upper left direction. The second recess (87) is formed between the right end portions of the first split plate (61) and the second split plate (71) (see FIG. 7), and extends from the lower end to the upper end of the removable partition plate (60). It extends diagonally to the upper right. The upper concave portion (88) is formed between the upper ends of the first divided plate (61) and the second divided plate (71) (see FIG. 3), and extends from the left end to the right end of the removable partition plate (60). Extending horizontally.

    The lower concave portion (85), the first concave portion (86), and the second concave portion (87) have the same groove depth, and a section perpendicular to the extending direction (hereinafter also referred to as a right-angled section) is rectangular inside. A space of shape is formed. The lower concave portion (85), the first concave portion, and the second concave portion (87) constitute a concave portion in which the packing member (93) of the seal portion (90) is disposed. The upper recess (88) has a groove depth smaller than that of the lower recess (85), the first recess (86), and the second recess (87).

    The two ring grooves (68, 78) described above are formed on the bottom surface (85a, 86a, 87a) (back surface) of each recess (85, 86, 87). On the bottom surface (85a, 86a, 87a) of each concave portion (85, 86, 87), a flat concave portion side flat portion (69) (first flat portion) between these two ring grooves (68, 78) ) Is formed.

[Gap]
As shown in FIGS. 3 and 10, in the assembled and detached partition plate (60), a slight gap (G1, G2) is formed between the thin plate portion (45) and each divided plate (61, 71). The That is, in each divided plate (61, 71), the height of the inner edge portion (front and rear length d2) of each fitting portion (65, 75) is the height of the outer edge portion of each fitting portion (65.75) ( It is smaller than the length d1). For this reason, in a state where the elastic member (80) is sandwiched between the fitting portions (65, 75), the tip surface (66b) of the trapezoidal conical portion (66) of the first divided plate (61) and the thin plate portion A slight annular gap (G1) is formed between (45) and (45). Similarly, a slight annular gap (G2) is formed between the tip surface (76b) of the trapezoidal cone (76) of the second divided plate (71) and the thin plate (45). Thereby, in the detachable partition plate (60) in the assembled state, the thin plate portion (45) is in contact with only the elastic member (80) and is not in contact with the partition plate body (60a) (non-contact state).

(Seal part)
The partition portion (40) is provided with two O-rings (91, 92) and one packing member (93) as a seal portion (90) for performing a water seal and an insulating seal. These seal portions (90) prevent water leakage between the first chamber (27) and the second chamber (28), and also cause electric leakage between the first chamber (27) and the second chamber (28). Also works to prevent.

[O-ring]
As shown in FIG. 3 etc., the partition part (40) has two O-rings (91, 92) (first member). The O-ring (91, 92) is made of an insulating resin material. The O-ring (91, 92) is preferably made of a material having high surface slidability, and is made of, for example, ethylene propylene rubber. Further, in order to improve the slidability of the O-ring (91, 92), the surface of the O-ring (91, 92) may be coated with fluorine processing or the like.

    The two O-rings (91, 92) are a first O-ring (91) that is externally fitted and fixed to a ring groove (68) of the first divided plate (61), and a ring groove of the second divided plate (71). (78) and a second O-ring (92) fixed by being fitted around. These O-rings (91, 92) may be molded integrally with the dividing plates (61, 71).

    As shown in FIG. 9, in a state where each O-ring (91, 92) is fitted in each ring groove (68, 78), the entire outer shape of the O-ring (91, 92) is that of the removable partition plate (60). It becomes a wedge shape along the outer edge. As shown in FIGS. 5 to 7, when each O-ring (91,92) is fitted in each ring groove (68,78), approximately half of each O-ring (91,92) is each ring. Fits into the groove (68,78). Thereby, the remaining almost half of the O-ring (91, 92) bulges outward from the ring groove (68, 78). That is, the O-ring (91, 92) has a bulging portion (91a, 92a) whose cross section perpendicular to the extending direction has an arc shape. The bulging portion (91a, 92a) is formed from the bottom surface (85a, 86a, 87a) (back surface) of the lower recess (85), the first recess (86), and the second recess (87). 85, 86, 87) bulges toward the open surface side (packing member (93) side).

[Packing material]
As shown in FIG.3 and FIG.11, the partition part (40) has one packing member (93). The packing member (93) is made of an insulating resin material (for example, silicon material) having a lower elastic modulus than the O-rings (91, 92). The packing member (93) is formed along the outer edge of the inner plate portion (63, 73) of the removable partition plate (60). The packing member (93) has a substantially U-shaped outer shape when viewed from the front. The packing member (93) includes a lower packing portion (94) (lower member) disposed in the lower recess (85) and a left packing portion (95) disposed in the first recess (86). ) (First side member) and a right packing part (96) (second side member) disposed inside the second recess (87). In this embodiment, the right-angle cross sections of these packing portions (94, 95, 96) all have the same shape.

    The right-angle cross section of each packing part (94, 95, 96) is formed in the substantially U shape so that the outer edge part side of a detachable partition plate (60) may open | release. Each packing part (94, 95, 96) is formed with a groove part (97, 98, 99) into which the inner edge part (52) of the mounting recess (51) is fitted. Specifically, in the packing member (93), a lower groove portion (97) is formed in the lower packing portion (94), a first groove portion (98) is formed in the left packing portion (95), and the right packing portion ( A second groove (99) is formed in 96). Each groove portion (97, 98, 99) has the same shape in a right-angle cross section.

    Each groove (97, 98, 99) has an outer groove (97a, 98a, 99a) formed near the open surface of each recess (85, 86, 87) and the back of the recess (85, 86, 87). The inner grooves (97b, 98b, 99b) formed on the side are respectively formed. The right-angle cross sections of the outer grooves (97a, 98a, 99a) and the inner grooves (97b, 98b, 99b) are rectangular. The width of each outer groove (97a, 98a, 99a) is larger than the width of each inner groove (97b, 98b, 99b). The inner grooves (97b, 98b, 99b) are continuously formed in the intermediate portion in the width direction of the outer grooves (97a, 98a, 99a). More specifically, the lower groove (97) has a lower outer groove (97a) in which the lower base (53a) is fitted, and a lower inner groove (97b) in which the lower protrusion (53b) is fitted. Are formed (see FIG. 5). The first groove (98) is formed with a first outer groove (98a) into which the first base part (54a) is fitted and a first inner groove (98b) into which the first convex part (54b) is fitted. (See FIG. 6). The second groove (99) is formed with a second outer groove (99a) into which the second base (55a) is fitted and a second inner groove (99b) into which the second convex part (55b) is fitted. (See FIG. 7).

    As shown in FIG. 5 to FIG. 7, the surface (packing) facing the bottom surface (85a, 86a, 87a) of each recess (85, 86, 87) among the outer peripheral surfaces of each packing portion (94, 95, 96). The rear surface (94a, 95a, 96a) has two fitting grooves (101, 102) and one packing side flat part (103) (second flat part) located between these fitting grooves (101, 102). ) And are formed respectively. The two fitting grooves (101, 102) are a first fitting groove (101) into which the bulging portion (91a) of the first O-ring (91) is fitted, and a bulging portion (92a) of the second O-ring (92). Is configured with a second fitting groove (102) into which is fitted. The first fitting groove (101) and the second fitting groove (102) have an inner peripheral surface having a substantially arc-shaped cross section at right angles. In the mounted state of the packing member (93), the outer peripheral surface of the bulging portion (91a, 92a) of each O-ring (91, 92) and the inner peripheral surface of each fitting groove (101, 102) are in surface contact. The packing side flat portion (103) is formed in a flat shape parallel to the concave portion side flat portion (69). In the mounted state of the packing member (93), the recess-side flat portion (69) and the packing-side flat portion (103) are in surface contact.

    Of the outer peripheral surfaces of each packing part (94, 95, 96), two surfaces (packing side surfaces (104, 105)) facing the pair of side inner walls (85b, 86b, 87b) of each recess (85, 86, 87) ) Are formed with two gap forming grooves (106, 107). Each gap forming groove (106, 107) has an inner peripheral surface having a substantially arcuate cross section at right angles. In the mounted state of the packing member (93), a gap having a bow-shaped cross section is formed between each recess (85, 86, 87) and the gap forming groove (106, 107).

    On the two packing side surfaces (104, 105), a protruding line (108) protruding outward is formed between two adjacent gap forming grooves (106, 107). The protrusions (108) extend in the extending direction of the corresponding packing portions (94, 95, 96). In the state before the packing member (93) is attached, the tip (108a) of the protrusion (108) of the present embodiment is formed in a narrow flat shape (see FIGS. 12 and 13). The width of the tip (108a) of the ridge (108) is smaller than the width of the gap forming groove (106, 107). As shown in FIG. 5, the tip (108a) of the ridge (108) includes a virtual plane P1 along the step surfaces (S1 to S6) of the inner edge (52) of the mounting recess (51), and a removable partition plate. It is located between the imaginary plane P2 along the bottom surface (85a, 86a, 87a) of each recess (85, 86, 87) of (60).

    Of the two packing side surfaces (104, 105), the end portion on the open side of the recess (85, 86, 87) is a flat end side flat portion parallel to the corresponding side inner wall (85b, 86b, 87b) ( 109) (third flat portion) is formed. The end side flat portion (109) is in surface contact with the respective side inner walls (85b, 86b, 87b) of the respective concave portions (85, 86, 87).

    The lower end (110) of the lower packing part (94) is formed in a horizontal flat shape along the bottom surface (22a) of the bottom wall (22) of the water tank (20). That is, the assembled partition portion (40) is configured such that the lower end (110) of the lower packing portion (94) is in close contact with the bottom surface (22a) of the bottom wall (22).

-Driving action-
The basic operation of the discharge unit (10) will be described with reference to FIGS. At the start of operation of the discharge unit (10), the first electrode (32) and the second electrode (33) are in a flooded state. When a square wave voltage is applied from the high voltage generator (31) to each electrode (32, 33), electricity flows from one electrode (32, 33) to the other electrode (33, 32). At this time, the hole (46) of the partition (40) serves as a current path between the electrodes (32, 33). Since the hole diameter of the hole (46) is extremely small, the current density of this current path increases. Then, Joule heat generated inside the hole (46) increases, and water in the hole (46) is vaporized to generate bubbles (B). As shown in FIG. 10, the bubble (B) is formed across the inside of the hole (46) and both ends of the hole (46) in the cylinder axis direction.

    In this state, the first chamber (27) in which the first electrode (32) is submerged and the second chamber (28) in which the second electrode (33) is submerged are electrically separated by bubbles (B). That is, the bubbles (B) in the partition part (40) function as an insulation resistor that blocks the conduction of water in the first chamber (27) and the second chamber (28). Thereby, around the gas-liquid interface of the bubble (B), the interface located in the first chamber (27) and the interface located in the second chamber (28) become pseudo electrodes, respectively. The potential difference increases. As a result, in the bubble (B), dielectric breakdown occurs in the bubble (B) across the gas-liquid interface, and discharge occurs. Accompanying this discharge, in water, purification components and sterilization factors (active species such as hydroxyl radicals) for purifying and sterilizing water are generated. Thereby, the water in a water tank (20) is purified.

    As shown in FIG. 10, in the through hole (41) of the present embodiment, enlarged diameter portions (64, 74) are formed on both sides of the intermediate hole (42), respectively. Thereby, the air bubbles generated in the hole (46) are quickly discharged from the through hole (41). As a result, bubbles can be accumulated only in the vicinity of the hole (46), and stable discharge can be performed continuously.

<Assembly process of the partition>
In the discharge unit (10), the removable partition plate (60) can be attached to and detached from the fixed partition plate (50). Thereby, the removable partition plate (60) in which the hole (46) is formed can be removed for maintenance, or the removable partition plate (60) can be replaced. On the other hand, if the fixed partition plate (50) and the detachable partition plate (60) are separated, a gap is formed between the fixed partition plate (50) and the detachable partition plate (60). As a result, if the insulation between the first chamber (27) and the second chamber (28) is impaired, the potential difference between the gas-liquid interfaces on both sides of the bubble (B) cannot be sufficiently secured, and the desired discharge Cannot be performed stably. Therefore, in the assembly process of the partition portion (40) of the present embodiment, the seal portion (90) is interposed between the mounting recess (51) of the fixed partition plate (50) and the removable partition plate (60).

    The assembly process of the partition part (40) will be described with reference to FIGS. 5 to 7 and FIGS. In the assembly step of the partition portion (40), first, a first step is performed in which the packing member (93) is attached to the inner edge portion (52) of the attachment recess (51). In the first step, the lower inner wall portion (53) of the mounting recess (51) is fitted into the lower groove portion (97) of the lower packing portion (94) shown in FIG. Specifically, the lower base portion (53a) is fitted into the lower outer groove (97a), and the lower convex portion (53b) is fitted into the lower inner groove (97b). Thereby, a lower packing part (94) is hold | maintained between a detachable partition plate (60) and a lower side inner wall part (53) (refer FIG. 5).

    At the same time, in the first step, the first inner wall portion (54) is fitted into the first groove portion (98) of the left packing portion (95) shown in FIG. Specifically, the first base portion (54a) is fitted into the first outer groove (98a), and the first convex portion (54b) is fitted into the first inner groove (98b). Thereby, the left packing part (95) is hold | maintained between a detachable partition plate (60) and a 1st inner wall part (54) (refer FIG. 6). In the first step, similarly, the first inner wall portion (54) is fitted into the second groove portion (99) of the right packing portion (96).

    Next, a second step is performed in which the removable partition plate (60) is attached to the packing member (93) fitted in the attachment recess (51). In the second step, the recesses (85, 86, 87) of the removable partition plate (60) are fitted into the packing portions (94, 95, 96).

    Specifically, in the second step, the lower concave portion (85) is fitted on the lower packing portion (94) shown in FIG. The lower concave portion (85) is moved downward so that the packing side surfaces (104, 105) of the lower packing portion (94) are along the side inner walls (85b, 85b). Here, two gap forming grooves (106, 107) are formed on the packing side surfaces (104, 105) of the lower packing portion (94), respectively. For this reason, the sliding resistance between each packing side surface (104, 105) of the lower packing part (94) and each side inner wall (85b, 85b) becomes extremely small, and the lower packing part (94) It can be easily fitted in the recess (85). In a state where the lower packing portion (94) is fitted in the lower concave portion (85), the bulging portion (91a) of the first O-ring (91) is fitted into the first fitting groove (101), and the second The bulging portion (92a) of the second O-ring (92) is fitted into the fitting groove (102).

    At the same time, in the second step, the first recess (86) is externally fitted to the left packing portion (95) shown in FIG. The first recess (86) is moved to the left so that the packing side surfaces (104, 105) of the left packing portion (95) are along the side inner walls (86b, 86b). Here, two gap forming grooves (106, 107) are formed on each packing side surface (104, 105) of the left packing portion (95). For this reason, the sliding resistance between each packing side surface (104, 105) of the left packing portion (95) and each side inner wall (86b, 86b) becomes extremely small, and the left packing portion (95) becomes the first recess ( 86) can be easily fitted. In a state where the left packing part (95) is fitted into the first recess (86), the bulging part (91a) of the first O-ring (91) is fitted into the first fitting groove (101), and the second fitting is performed. The bulging portion (92a) of the second O-ring (92) is fitted into the mating groove (102). Similarly, in the second step, the right packing portion (96) is externally fitted into the second recess (87) (not shown).

    The mounting recess (51) has a wedge shape in which the left and right widths become narrower in the downward direction, and the removable partition plate (60) has a wedge shape corresponding to the mounting recess (51). For this reason, the detachable partition plate (60) can be easily inserted to the lower end of the mounting recess (51). In such a mounting state, the O-rings (91, 92) and the packing member (93) are tightly sandwiched between the attaching / detaching partition plate (60) and the mounting recess (51). The sealability (water sealability and insulation sealability described later in detail) is improved, and the removable partition plate (60) is firmly fixed to the fixed partition plate (50).

<Operation of seal part>
Next, the operation of the seal portion (90) in the partition portion (40) in the assembled state will be described with reference to FIGS.

    In the assembled partitioning part (40), the bulging part (91a) of the first O-ring (91) is fitted in the first fitting groove (101), and the bulging part (92a) of the second O-ring (92). Is fitted into the second fitting groove (102). Here, since the packing member (93) has a smaller elastic modulus than the O-rings (91, 92), the fitting grooves (101, 102) are deformed along the bulging portions (91a, 92a). Thereby, the surface of each bulging part (91a, 92a) and the inner peripheral surface of each fitting groove (101, 102) are in close surface contact. Further, between the first fitting groove (101) and the second fitting groove (102), the flat concave portion side flat portion (69) and the flat packing side flat portion (103) are in close surface contact. To do. Thus, in each bottom face (85a, 86a, 87a) of each recessed part (85, 86, 87), the 1st fitting groove (101), the packing side flat part (103), and the 2nd fitting groove (102 ) Over the surface) is formed. As a result, even if water enters the outer sides of the first O-ring (91) and the second O-ring (92) (the left and right outer sides in FIG. 5), the water can be prevented from entering these areas. Secure water seal.

    Also, even if water enters the outer sides of both the first O-ring (91) and the second O-ring (92) (on the left and right sides in FIG. 5), the surface contact between the two waters is relatively long. A region is formed. That is, for example, as shown in FIG. 5, in the seal portion (90), the creepage distances of the surfaces of the first fitting groove (101), the packing-side flat portion (103), and the second fitting groove (102) are secured. it can. Therefore, an insulation seal between the two waters can be sufficiently secured, and a leakage current between the two waters can be suppressed. As a result, sufficient insulation between the water in the first chamber (27) and the water in the second chamber (28) can be secured, and a desired discharge can be stably performed at a predetermined output voltage.

    Further, when each packing part (94, 95, 96) is sandwiched between the inner edge part (52) of the mounting recessed part (51) and each recessed part (85, 86, 87), for example, the step surfaces (S1, S2 in FIG. 5) ), And the lower packing part (94) is vertically compressed between the virtual plane P1 along the virtual plane P2 along the bottom surface (85a) of the lower recess (85) in FIG. Then, for example, the packing portion above the step surface S1 bulges leftward. As a result, the ridge (108) between the first gap forming groove (106) and the second gap forming groove (107) is also displaced leftward and comes into contact with the left side inner wall (85b). As a result, the surface of the ridge (108) and the side inner wall (85b) is in close contact with each other, and the water sealing performance of this portion is improved. The same applies to the reverse (right) ridge (108).

    Moreover, the site | part of the both sides of a lower side inner wall part (53) among the lower packing parts (94) is pressed below by two O-rings (91,92). Thereby, the lower end (110) of the lower packing part (94) comes into close contact with the bottom surface (22a) of the bottom wall (22) of the water tank (20). As a result, the sealing performance between the lower packing portion (94) and the bottom surface (22a) can also be improved.

    6 and 7 also basically have the same operational effects as FIG. In addition, in FIG.6 and FIG.7, the infiltration of the water in a recessed part (86,87) is suppressed by the end side flat part (109). That is, for example, as shown in FIG. 6, the left packing portion (95) is pushed leftward by the two O-rings (91, 92), and is located outside the open surface of the first recess (86) (left side in FIG. 6). ) May be located. However, on the first packing side surface (104) and the second packing side surface (105) of the left packing portion (95), the end flat portions (109) are respectively provided in the portions adjacent to the open surface of the first recess (86). Forming. Thereby, even if the left packing part (95) is slightly shifted to the left side, the inner corner of the open end wall of the first recess (86) does not fall into the gap forming groove (107). Therefore, it is also possible to prevent water from entering from the opening of the first recess (86) due to the left packing part (95) being displaced outward. The same applies to the end flat portion (109) of the right packing portion (96) in FIG.

<Operation of elastic member>
The effect | action of the elastic member (80) mentioned above is demonstrated referring FIG.3, FIG8 and FIG.10.

    During the operation of the discharge unit (10) described above, minute vibrations are continuously generated in water along with the discharge. This vibration also acts on the thin plate portion (45). The thin plate portion (45) is formed to be very thin (for example, 0.5 mm) in order to easily process fine holes (for example, a hole diameter of 50 μm). For this reason, when the vibration accompanying discharge acts on the thin plate portion (45), the holding portion of the thin plate portion (45) may be broken. Therefore, in the present embodiment, the thin plate portion (45) is held on the partition plate body (60a) via the elastic member (80).

    Specifically, the outer peripheral portion (45a) of the thin plate portion (45) is held by the annular embedded portion (83) of the elastic member (80). The elastic member (80) is formed of a flexible material (silicon) having a lower elastic modulus than the thin plate portion (45) and the partition plate body (60a). For this reason, even if a thin plate part (45) vibrates, the stress of the holding part of a thin plate part (45) does not increase so much, and the crack of a thin plate part (45) can be prevented.

    The thin plate portion (45) is entirely covered with the elastic member (80), and the distance from the outer peripheral end portion of the thin plate portion (45) to the outer peripheral end portion of the elastic member (80) is also constant. For this reason, local concentration of stress can be suppressed in the thin plate portion (45), and cracking of the thin plate portion (45) can be reliably prevented.

    The thin plate portion (45) is held inside the fitting portions (65, 75) of the two divided plates (61, 71) and is held inside the divided plates (61, 71). Thereby, alignment of the through-hole (41) formed in the division | segmentation board (61, 71) and the hole (46) of a thin-plate part (45) can also be performed easily. In particular, the elastic member (80) has a structure in which the annular tapered surface (81, 82) is fitted to the trapezoidal cone portion (66, 76) of the dividing plate (61, 71). Even if the position of 80) is slightly shifted in the thickness direction, the axis of the elastic member (80) and the trapezoidal cone (66, 76) can be aligned, and as a result, the through hole (41) and the hole (46) Can be positioned substantially on the same axis.

-Effect of the embodiment-
According to the above embodiment, since the thin plate portion (45) is held by the partition plate main body (60a) via the elastic member (80), the thin plate portion (45) is broken due to vibration generated during discharge. Can be suppressed.

    Since the thin plate portion (45) is sandwiched between the divided plates (61, 71), the holes (46) of the thin plate portion (45) and the through holes (41) of the partition plate body (60a) are aligned. The thin plate portion (45) can be held inside the partition plate body (60a) via the elastic member (80) while performing easily. For example, when the thin plate portion (45) and the partition plate body (60a) are integrally processed by insert molding, stress is applied to the holding portion of the thin plate portion (45) due to thermal contraction of the partition plate body (60a). May occur. Therefore, the thin plate portion (45) may be broken during the processing of the partition portion (40). On the other hand, in this embodiment, since the elastic member (80) and the thin plate portion (45) are sandwiched and joined between the two divided plates (61, 71), the thin plate portion is caused by heat shrinkage. (45) will not break.

    Since the elastic member (80) covers the outer peripheral portion (45a) of the thin plate portion (45), local stress can be prevented from being generated in the outer peripheral portion (45a) of the thin plate portion (45). 45) can be prevented from cracking. In particular, since the distance from the outer peripheral edge of the thin plate portion (45) to the outer peripheral end of the elastic member (80) is equal, the stress generated in the thin plate portion (45) can be made uniform and the thin plate portion (45) can be more reliably cracked. Can be prevented.

    By aligning the tapered surface (81, 82) of the elastic member (80) with the trapezoidal cone (66, 76) of the dividing plate (61, 71), the through hole (41) of the dividing plate (61, 71) The holes (46) of the thin plate portion (45) can be reliably communicated with each other, and the discharge in the desired bubbles can be stably performed.

    By forming a gap (G1, G2) between the tip surface (66b, 76b) of the trapezoidal cone (66,76) and the thin plate (45) of the dividing plate (61,71), 60a) and the thin plate portion (45) are completely in a non-contact state. Thereby, it is possible to prevent the vibration of the divided plates (61, 71) from propagating to the thin plate portion (45), and to reliably avoid the crack of the thin plate portion (45).

    By forming the enlarged diameter portion (64, 74) in the through hole (41), the bubbles generated in the hole (46) can be quickly discharged, and the bubbles can be collected only in the vicinity of the hole (46). As a result, stable discharge can be continuously performed between the two gas-liquid interfaces sandwiching the hole (46). Further, since the enlarged diameter portion (64, 74) is formed not on the thin plate portion (45) but on the divided plate W (61, 71) having a small thickness constraint, the enlarged diameter portion (64, 74) is processed. Is also relatively easy.

    According to the embodiment, since the removable partition plate (60) can be removed from the fixed partition plate (50), maintenance of the hole (46) and its peripheral portion can be easily performed. In addition, the removable partition plate (60) can be easily replaced. For example, the removable partition plate (60) having a hole of an optimum size according to the liquid to be discharged can be replaced.

    In the seal part (90), since the O-ring (91, 92) and the packing member (93) are in surface contact, even if water enters both sides of the surface contact part, the creeping distance of these waters is increased. can do. Therefore, not only can the water sealing performance be improved, but also the performance of the insulating seal can be improved. As a result, it can be avoided that the insulation between the first chamber (27) and the second chamber (28) is impaired, and the desired discharge is stably generated in the bubbles generated in the hole (46). It can be carried out. In addition, by ensuring the insulation between the two chambers (27, 28) in this way, it is possible to generate a discharge while reducing the output voltage of the high voltage generator (31).

    By attaching the mounting recess (51) and the detachable partition plate (60) to a wedge shape, it is easy to attach and remove the detachable partition plate (60) to the mounting recess (51), and maintenance and replacement of the detachable partition plate (60) Will also be easier. In addition, when the removable partition plate (60) is attached to the mounting recess (51), the O-ring (91, 92) and the packing member (93) are in close contact with each other, improving the performance of the water seal and insulating seal. In addition, it is possible to prevent the removable partition plate (60) from being easily detached. Therefore, for example, both members can be fixed without adhering the detachable partition plate (60) and the mounting recess (51). Or the usage-amount of the adhesive agent of a detachable partition plate (60) and an attachment recessed part (51) can be reduced.

    By fitting the bulging part (91a, 92a) of the O-ring (91, 92) into the fitting groove (101, 102), the O-ring (91, 92) and the packing member (93) can be reliably in surface contact. , Can ensure a long creepage distance. In particular, by forming a face seal over the two fitting grooves (101, 102) and the second flat portion (103) between them, the creepage distance is further increased, and the performance of the insulating seal can be further improved.

    By placing the O-ring (91, 92) and packing member (93) inside the recess (85, 86, 87) of the removable partition plate (60), these members (91, 92, 93) The water seal performance can be improved.

    On the base (53a, 54a, 55a) and convex (53b, 54b, 55b) of the mounting recess (51), the outer groove (97a, 98a, 99a) and inner groove (97b, 98b, 99b) of the packing member (93) ) Can be securely held inside the mounting recess (51).

    Since the gap forming grooves (106, 107) are formed on the packing side surfaces (104, 105) of the packing member (93), it is possible to prevent water from entering due to capillary action. Further, the sliding resistance between the packing side surfaces (104, 105) and the side inner walls (85b, 86b, 87b) is reduced, and the packing member (93) is easily fitted into the recesses (85, 86, 87). In particular, when two gap forming grooves (106, 107) are formed on the packing side surfaces (104, 105), this effect becomes remarkable. Further, by forming a ridge (108) between the two gap forming grooves (106, 107), the ridge (108) and the side inner walls (85b, 86b, 87b) are brought into contact with each other to seal water. Can be improved.

    As the packing member (93) is compressed between each step surface (S1 to S6) and the bottom surface (85a, 86a, 87a) of each recess (85, 86, 87), the ridge (108) is on the side. Since it bulges to the inner wall (85b, 86b, 87b), the ridge (108) and the side inner wall (85b, 86b, 87b) can be brought into close contact with each other, and the sealing performance of this part can be further improved. .

    The end flat portion (109) can prevent water from entering between the side inner walls (86b, 87b) and the second member (93) from the vicinity of the open surface of the recess (86, 87).

    By bringing the lower end (110) of the lower packing portion (94) into close contact with the bottom surface (22a) of the water tank (20), the water sealing performance of this portion can be improved.

    As described above, the present invention is useful for the discharge unit.

10 Discharge unit
20 aquarium
27 Room 1
28 Room 2
31 High voltage generator
32 First electrode
33 Second electrode
40 partition
41 Through hole
45 Thin plate
45a Outer periphery
60a Divider body
66a Inclined surface
66b Tip surface
76a Inclined surface
76b Tip surface
61 First division plate
65 Mating part
71 Second division plate
75 Mating part
80 Elastic member
80a Inner peripheral edge
81 First taper surface
82 2nd taper surface
83 Buried part

Claims (7)

A high voltage generator (31);
A first electrode (32) and a second electrode (33) to which a potential difference is applied from the high voltage generator (31);
Aquarium (20),
The water tank (20) is divided into a first chamber (27) in which the first electrode (32) is submerged and a second chamber (28) in which the second electrode (33) is submerged, and the first electrode (32 ) And the second electrode (33), and an insulating partition (40) in which fine holes (46) are formed.
By applying a potential difference from the high voltage generator (31) to the first electrode (32) and the second electrode (33), bubbles are generated from the holes (46), and discharge is performed in the bubbles. A discharge unit configured in
The partition (40)
A partition plate body (60a) attached to the water tank (20);
An elastic member (80) having a lower elastic modulus than the partition plate body (60a) and fixed to the partition plate body (60a);
A discharge unit comprising: a thin plate portion (45) in which the hole (46) is formed and held by the elastic member (80). In claim 1,
The partition plate body (60a) has two split plates (61, 71) that are split in the thickness direction of the partition plate body (60a).
Each of the divided plates (61, 71) has a fitting portion (65, 65) in which a part of the elastic member (80) is fitted and a through hole (41) communicating with the hole (46) is formed therein. 75), each of which is joined to each other so as to sandwich the elastic member (80) inside the two fitting parts (65, 75). In claim 2,
The elastic member (80) is formed in an annular shape,
The discharge unit according to claim 1, wherein an embedded portion (83) in which the outer peripheral portion (45a) of the thin plate portion (45) is embedded is formed in the inner peripheral edge portion (80a) of the elastic member (80). In claim 3,
The thin plate portion (45) is formed in a disc shape,
The elastic member (80) is formed in an annular shape,
In the embedded portion (83) of the elastic member (80), the thin plate portion (45) is embedded so that the axial center of the elastic member (80) and the axial center of the thin plate portion (45) coincide. A discharge unit characterized by being formed in an annular shape. In claim 4,
Around the through hole (41) of the divided plate (61, 71), the outer diameter is located coaxially with the through hole (41) and approaches the hole (46) of the thin plate portion (45). A trapezoidal cone (66,76) is formed to be small,
At the end in the thickness direction of the elastic member (80), there is an annular tapered surface (81, 82) along the inclined surface (66a, 76a) of the trapezoidal cone (66, 76) of the dividing plate. A discharge unit characterized in that is formed. In claim 5,
A discharge unit, characterized in that a gap (G) is formed between the tip surface (66b, 76b) of the trapezoidal cone (66, 76) and the thin plate (45). In any one of Claims 2 thru | or 6,
The through hole (41) of each of the divided plates (61, 71) has an enlarged diameter portion (64, 74) that increases the inner diameter toward the opening end opposite to the hole (46). Discharge unit featuring.

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