JP4995952B2 - Discharge electrode bar of ionizer - Google Patents

Description

  The present invention relates to static electricity control in the air, and more particularly to a discharge electrode bar of an ionizer.

  Static electricity removal (static elimination) is performed to control static electricity in the air, such as cleaning in a clean room and preventing static charge of suspended particles. Corona discharge ionization devices are often used for this non-contact static elimination. Yes.

  1 to 2 show discharge electrode bars included in currently available DC ionizers. The discharge electrode bar 1 has an elongated cylindrical case 2, and the case 2 has a plurality of discharge electrodes 3 (FIG. 1) spaced apart from each other along the longitudinal direction. 2, a high voltage power supply unit 4 or a control unit 5 was accommodated between adjacent discharge electrodes 3 and 3. In addition, the discharge electrode bar 1 has a case 2 composed of an upper divided case portion 7 and a lower divided case portion 8 which are divided vertically (FIG. 2).

  Of the plurality of discharge electrode assemblies 3, the positive electrode is denoted by 3a and the negative electrode is denoted by 3b, which are identified in the drawing. Air can be supplied around the discharge electrodes 3 through a flexible tube 6 disposed inside the case 2.

  In the conventional discharge electrode bar 1, the configuration in which the high-voltage power supply unit 4 and the control unit 5 are arranged between the adjacent discharge electrodes 3 and 3 is adopted. The minimum design distance between them is limited by the size of the high-voltage power supply unit 4 or the control unit 5. Therefore, for example, when the discharge electrode bar 1 is arranged near the work, there is a problem that unevenness is easily generated in the charge removal effect.

  In order to assemble the discharge electrode bar 1, first, the high voltage unit 4 and the control unit 5 must be fixed to the lower divided case portion 8. In this case, in the lower divided case portion 8 having a depth, Since all operations for inserting and fixing the high voltage unit 4 and the control unit 5 must be performed through the narrow opening 8a of the lower divided case portion 8, the opening 8a of the lower divided case portion 8 is forcibly forced. The above work is often performed in a spread state, and the workability is extremely poor.

An object of the present invention is to provide an ionization apparatus capable of improving the degree of freedom in setting the distance between the discharge electrodes of the discharge electrode bar and the discharge electrode bar.
It is a further object of the present invention to provide an ionization apparatus and its discharge electrode bar that can improve the work of assembling the built-in components of the discharge electrode bar.
Another object of the present invention is to provide a discharge electrode bar that does not disturb the airflow in the atmosphere as much as possible.

According to the present invention, the above technical problem is
A discharge electrode bar of an ionization device in which a plurality of discharge electrodes are arranged apart from each other in the longitudinal direction of an elongated case, and ions are generated by applying a high voltage to the discharge electrodes,
A case having a cross-sectional shape in which the upper ends of the left and right side walls are closed and opened downward;
A high-voltage power supply unit and a control unit disposed in an upper region of the case and arranged side by side in the longitudinal direction of the case;
An air unit located below the case and spaced from the high-voltage power supply unit and the control unit, and extending in the longitudinal direction of the case and forming an independent air passage isolated from the atmosphere in the case;
A discharge electrode assembly that supports the discharge electrode, and a plurality of discharge electrode assemblies attached at intervals in a longitudinal direction of the air unit;
The air unit includes a plurality of cylindrical portions that are spaced apart in the longitudinal direction and project downward.
The discharge electrode assembly is detachably assembled to the air unit by fitting the discharge electrode assembly to the cylindrical portion,
By mounting the discharge electrode assembly on the cylindrical portion of the air unit, the air supplied from the air source is distributed to each discharge electrode assembly via the independent air passage of the air unit, and each discharge electrode assembly This is achieved by providing a discharge electrode bar characterized in that air distributed to the outside is discharged to the outside from the vicinity of the discharge electrode.

  In a preferred embodiment of the present invention, the case includes a base plate portion that partitions substantially above and below the inside of the case. The base plate substantially divides the inside of the case into an upper space and a lower space, and a high voltage power supply unit that generates heat is accommodated in the upper space. For example, the protective material and the filler in the case are gasified. However, the outflow to the lower space can be suppressed. Preferably, the high voltage unit is enclosed in a sealed box. The high voltage unit is covered with silicon or epoxy resin as a protective material as necessary, but silicon or epoxy resin as a protective material can be enclosed in the sealed box together with the high voltage unit.

  When the left and right divided case parts constituting the case are integrated, it is preferable to form an inverted U-shaped cross section. Thereby, generation | occurrence | production of the disturbance of the airflow which flows under the atmosphere around a discharge electrode bar can be suppressed.

  In addition, the air unit is preferably provided with a protrusion on the side wall, and a groove for receiving the protrusion is provided on the inner walls of the left and right split case portions. According to this, in the state where the left and right divided case portions are separated, the air unit is assembled so that the protrusion is engaged with the groove of one divided case portion, and then the other divided case portion is connected to one divided case portion. As a result, it is possible to form a state in which the air unit is sandwiched between the left and right divided case portions. The protrusion may be a protrusion extending in the longitudinal direction of the air unit. Further, protrusions or ridges may be provided in the left and right divided case parts, and grooves for receiving the protrusions or protrusions may be provided in the air unit. Other objects and advantages of the present invention will become apparent from the detailed description of the following examples.

It is a figure for demonstrating the structure of the conventional discharge electrode bar. It is sectional drawing along the II-II line | wire of FIG. 1 for demonstrating the structure of the conventional discharge electrode bar. It is a figure for demonstrating the structure of the discharge electrode bar according to this invention. It is an assembly exploded perspective view of the discharge electrode bar of an example. It is a disassembled perspective view which shows the state which attaches an air unit to one division | segmentation case part of a case. It is a disassembled perspective view which shows the state which attaches a power supply unit etc. to one division | segmentation case part of a case. It is principal part sectional drawing for demonstrating the structure of the discharge electrode assembly employ | adopted in the Example, and the assembly | attachment to an air unit.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 3 is a view for explaining the discharge electrode bar of the ionization apparatus of the embodiment. The discharge electrode bar 100 has a case 101. Inside the case 101, an air unit 102 and a discharge electrode assembly 103 are arranged in a lower region thereof, and a high voltage unit 104, a power supply circuit, A control unit 105 including a display circuit and a CPU is disposed. That is, the discharge electrode bar 100 is disposed in an upper region where the high voltage unit 104 and the control unit 105 serving as heat sources do not interfere with the discharge electrode assembly 103. Therefore, since there is no control unit or the like between the adjacent discharge electrode assemblies 103 as in the prior art, the interval between the adjacent discharge electrode assemblies 103 can be freely set.

  Since the case 101 shows a state when the discharge electrode bar 100 is assembled in FIG. 4, the case 101 is shown upside down with respect to the case where the discharge electrode bar 100 is installed. The case 101 has an elongated U-shaped cross section, and the upper end (the lower end in the drawing) has a curved shape with a relatively smooth cross section, and has a side wall extending substantially vertically from the upper end. . The case 101 has a structure that is divided into right and left divided case portions 101R and 101L.

  The left and right divided case portions 101L and 101R are extrusion molded products made of a plastic material. The upper ends (lower ends in the drawing) of the left and right divided case portions 101L and 101R can be slidably fitted. That is, in the case 101 shown in the figure, an enlarged head 107 projecting in the lateral direction is formed at the upper end (lower end in the drawing) of the right split case portion 101R, and this enlarged head 107 extends along the upper edge of the right split case portion 101R. Extending over the entire length of the right split case portion 101R. An upper end (lower end in the drawing) of the left split case portion 101L is formed with a groove 108 having a shape complementary to the contour of the enlargement head 107 at the upper end (lower end in the drawing). It extends in the longitudinal direction along the upper edge of 101L, and both ends of the groove 108 are open. The groove 108 can receive the enlargement head 107 from either end thereof. For example, the enlargement head 107 is inserted from one end of the groove 108, and the left and right divided case portions 101L and 101R are relatively moved in the longitudinal direction. The left and right divided case portions 101L and 101R are brought into a state in which they cannot be detached, and form an inverted U-shaped cross-sectional shape that opens toward the lower end (the upper end in the drawing). Of course, the enlargement head 107 may be provided in the left split case portion 101L, and the groove 108 may be provided in the right split case portion 101R.

  In the illustrated example of FIG. 5, the right split case portion 101R is integrally formed with a base plate portion 109 extending in the lateral direction, that is, in the horizontal direction on the side wall portion, and the base plate portion 109 extends over the entire length of the right split case portion 101R. It extends (see also FIG. 6). A bent portion 110 that is bent upward (downward in FIG. 5) by 90 degrees is formed at the free end, that is, the side edge in the width direction of the base plate 109. On the other hand, an L-shaped portion 111 is formed on the side wall portion of the left divided case portion 101L, and the L-shaped portion 111 extends over the entire length of the left divided case portion 101L. The base plate portion 109 may be formed in the left divided case portion 101R, and the L-shaped portion 111 may be formed in the right divided case portion 101L.

  When the left and right divided case portions 101L and 101R are relatively slid and assembled, the bent portion 110 of the above-described base plate portion 109 opens downward (upward in FIG. 5) formed by the L-shaped portion 111. In this way, the base plate portion 109 constitutes a partition wall that substantially divides the case 101 up and down.

  The left and right split case portions 101L and 101R are formed with a pair of protrusions 113 below the lower end portion of the side wall (upper end portion in FIGS. 5 and 6), that is, below the base plate portion 109 (upward in the drawing). The protrusion 113 extends over the entire length of the split case portions 101L and 101R.

  FIG. 6 is an exploded perspective view for explaining an assembly process of the high voltage unit 104 and the control unit 105 arranged on the upper side of the case 101. Reference numeral 115 in FIG. 6 indicates a high voltage unit housing box having a rectangular cross section, and as will be described later, the high voltage unit 104 and a protective agent such as silicon are stored in the box 115 in a sealed state.

  The control unit 105 described above includes a modular board 116, a power supply board 117, a CPU board 118, and the like. The modular board 116 is fixed to the side wall of the right split case portion 101R with screws 120 via a pedestal 119. Also, a plastic engagement pin 121 is fixed to the side wall of the right split case portion 101R using a screw 120, and the hook-shaped retaining tip of the engagement pin 121 is connected to the power supply board 117 and the CPU board 118. By inserting into the holes, the power supply board 117 and the CPU board 118 are fixed to the side wall of the right split case portion 101R via the engagement pins 121. Further, the high voltage unit accommodation box 115 in which the high voltage unit 114 is stored is fixed to the side wall of the right split case portion 101R using the double-sided tape 123.

  As can be understood from the above description, since the work can be performed in an open space, the assembling work of the control unit 105 and the high voltage unit 114 is relatively easy.

  The modular board 116, the power supply board 117, the CPU board 118, and the high voltage unit accommodation box 115 fixed to the right split case portion 101R by the above-described method are arranged in the right split case in the upper region of the base plate portion 109 of the right split case portion 101R. Arranged in a line along the longitudinal direction of the portion 101R. The base plate portion 109 of the right split case portion 101R includes a notch 109a (FIG. 5) at its longitudinal end portion, and the cable 125 with a high voltage socket and the GND cable 126 are passed through the notch 109a. Is taken out into the lower area of When the notch 109a is relatively large, the notch 109 is substantially blocked by the packing 127 (FIG. 5), and thereby the gas between the upper region and the lower region is sandwiched between the base plate portion 109. It is preferable to prevent distribution as much as possible.

  As shown in FIGS. 4 and 5, an air unit 102 is provided below the base plate portion 109 (upper in the drawing). The air unit 102 has a flange 131 extending outward in the width direction, and the flange 131 extends in the longitudinal direction of the air unit 102. A plurality of circular bosses 132 extending upward (downward in the drawing) are provided on the upper wall (lower wall in the drawing) of the air unit 102 at intervals in the longitudinal direction of the air unit 102. A plurality of discharge electrode assembling cylindrical portions 133 are formed on the lower wall (upper wall in the drawing) of the air unit 102 at intervals in the longitudinal direction. An air tube joint 134 is provided on the end wall of the air unit 102, and a flexible tube 135 is fitted into the joint 134 to connect adjacent air units 102, and an air source (not shown). ) Is connected to an air port 136 (FIG. 5) that receives the supply of air from the fluid passage. The air introduced from the air source to the air port 136 (FIG. 5) passes through the air unit 102 and is discharged to the outside from each discharge electrode assembly 103.

  In order to incorporate the air unit 102 into the case 101, as shown in FIG. 5, for example, a flange 131 of the air unit 102 is formed in a groove 137 (FIG. 5) formed by the base plate portion 109 and the protrusion 113 of the right split case portion 101R. Is inserted by inserting the circular boss 132 of the air unit 102 into the elongated hole 137 extending in the width direction of the base plate portion 109. By assembling the other left split case portion 101L to the right split case portion 101R by the method described above, the air unit 102 is placed in a state where the left and right flanges 131 are received in the grooves 137. The movement of the air unit 102 in the longitudinal direction is substantially prevented by the engagement between the circular boss 132 and the elongated hole 137. For example, a cushioning material such as a rubber sheet 138 (FIG. 5) is attached to the surface of the flange 131 to prevent vertical play or rattling of the air unit 102 after the air unit 102 is assembled. Good.

  When the control unit 105 and the air unit 102 are assembled between the left and right divided case portions 101L and 101R by the above-described steps, the air unit 102 is covered with a GND plate 140 as shown in FIG. As a result, the elongated opening portion having an inverted U-shaped cross section formed by the left and right divided case portions 101L and 101R is covered with the GND plate 140.

  The GND plate 140 has an opening 141 at a portion corresponding to the cylindrical portion 133 of the air unit 102. The diameter of the opening 141 is larger than the diameter of the outer contour of the cylindrical portion 133. The GND plate 140 is fixed by screwing a screw 143 penetrating therethrough into a receiving boss 144 formed on the lower wall (the wall facing upward in the drawing) of the air unit 102.

  The case 101 includes a pair of end caps 145 (FIG. 4), and both end openings of the left and right divided case portions 101 </ b> L and 101 </ b> R provided with the GND plate 140 are closed by attaching the end caps 145. The end cap 145 is fixed to the left and right split case portions 101L and 101R using screws 146.

  Referring to FIG. 7, the discharge electrode assembly 103 includes an electrode 150 made of, for example, tungsten and a cap 151 that supports the electrode 150. The cap 151 includes a circular base 152 that supports the vicinity of the tip of the electrode 150, and extends vertically from the periphery of the circular base so as to surround the periphery of the tip of the electrode 150 and to engage with the outer peripheral surface of the cylindrical portion 133 of the air unit 102. The outer cylinder portion 153 to be joined and the small diameter portion 154 extending to the vicinity of the rear end of the electrode 150 along the electrode 150, and the outer cylinder portion 153 of the assembly 103 is detachably fitted to the cylinder portion 133 of the air unit 102. As a result, the discharge electrode assembly 103 is fixed to the air unit 102, and the small diameter portion 154 of the assembly 103 and the cylindrical portion 133 of the air unit 102 communicate with the air passage 156 of the air unit 102. 157 is formed. Air from the air source is discharged from an air discharge port (not shown) near the electrode 150 of the discharge electrode assembly 103 from the air unit 102 (air passage 156) through the air discharge passage 157 to the outside.

  The air unit 102 includes a sleeve 158 that receives a rear end portion (upper end portion in FIG. 7) of the small diameter portion 154 of the discharge electrode assembly 103, and a bottom portion surrounded by the sleeve 158 has a high height made of stainless steel. A voltage distribution board 159 is installed. The high voltage distribution board 159 is accommodated in a sealed state in a space formed in the unit 102 (a space communicating with the sleeve 158) so as not to be exposed to the outside along the longitudinal direction of the sleeve 158.

  When the assembly 103 is incorporated into the cylindrical portion 133 of the air unit 102, the small diameter portion 154 is fitted into the sleeve 158, and the rear end surface of the electrode 150 is in contact with the cut and raised portion 159a of the high voltage distribution plate 159 to be electrically connected. Is done.

  The rear end portion (upper end portion in FIG. 7) of the small diameter portion 154 has a circumferential groove around it, and an O-ring 160 is provided in the circumferential groove. When the small-diameter portion 154 is fitted into the sleeve 158, the O-ring 160 seals the space 162 where the rear end of the high voltage distribution plate 159 and the electrode 150 is located.

  For the cap 151 of the assembly 103, it is desirable to use a material excellent in creeping discharge resistance, for example, a resin material having a high CTI value. Thereby, insulation against creeping discharge can be ensured. For example, one or more of the illustrated circumferential flanges 162 may be provided on the outer peripheral surface of the cap 151 or the outer cylinder portion 153 of the air unit 102 to ensure the creeping distance. The size of the opening 141 of the GND plate 140 is such that there is a separation distance between the peripheral edge forming the opening 141 and the outer peripheral edge of the circumferential flange 162 of the outer cylinder portion 153 of the cap 151 or the air unit 102. It is better to set and prevent the creepage distance between them. This separation distance is preferably set to a certain distance or more in consideration of the voltage applied to the discharge electrode 150 in order to prevent discharge due to a spatial path.

  The air unit 102 is made of several parts. In order to join these parts to each other, in particular, the parts forming the air passage 156 are joined by welding using, for example, an ultrasonic welding method. It is good. By fixing each part of the air unit 102 by welding, it is possible to improve insulation and prevent a creeping path from being formed on the mating surface of each part, and the parts constituting the air unit 102 Are assembled in close contact with each other, so that an independent air passage completely isolated from the atmosphere in the case 101 is formed until the air introduced from the air source through the air port 136 is discharged from the discharge electrode assembly 103. can do.

  Whether air is supplied from the air source to the air port 136 and discharged from the discharge electrode assembly 103 is arbitrary. In relation to the user's factory equipment, discharge may be performed while discharging air from the discharge electrode assembly 103, or the discharge electrode assembly 103 may be used without discharging air from the discharge electrode assembly 103. Also good. When air is not discharged from the discharge electrode assembly 103, the case 101 having the inverted U-shaped cross section of the discharge electrode bar 100 is relatively narrow, and the vertical length of the side wall of the case 101 is relatively long. Further, the air flow flowing below the atmosphere around the discharge electrode bar 100 can be allowed to pass through without being disturbed, and the static elimination speed can be increased.

  If the internal air passage 156 is omitted from the discharge electrode bar 100, instead of the air unit 102, a base substantially including a sleeve 158 and a high voltage distribution plate 159 disposed at the bottom surrounded by the sleeve 158, It is enough to prepare. The high voltage distribution board 159 is preferably surrounded by an appropriate plastic molding material so as not to be exposed to the outside. This eliminates the need to cover the high voltage board 159 with a silicon filler.

  As can be understood by those skilled in the art, the power supply of the above-described discharge electrode bar 100 and the ionizer including the same may be AC or DC. Since the case 101 of the discharge electrode bar 100 is composed of the left and right divided case portions 101L and 101R, the discharge electrode bar 100 can be easily assembled. Further, since the inside of the case 101 is substantially vertically divided by the base plate portion 109, the upper region can be substantially isolated from the lower region.

DESCRIPTION OF SYMBOLS 100 Discharge electrode bar 101 Case 102 Air unit 103 Discharge electrode assembly 104 High voltage unit 105 Control unit 101R Right division case part 101L Left division case part 109 Base plate part (partition wall)
107 Magnifying head at the upper end of the right split case 108 Groove in the left split case (accepting the enlarged head)
115 High-voltage unit housing box 131 Air unit flange (projection or protrusion)
133 Cylindrical portion 136 projecting below air unit 136 End cap air port 137 Case groove 140 GND plate 141 GND plate opening 145 End cap 150 Discharge electrode 153 Discharge electrode assembly outer cylinder portion 154 Discharge electrode assembly small diameter portion 157 Air discharge passage

Claims (12)

A discharge electrode bar of an ionization device in which a plurality of discharge electrodes are arranged apart from each other in the longitudinal direction of an elongated case, and ions are generated by applying a high voltage to the discharge electrodes,
A case having a cross-sectional shape in which the upper ends of the left and right side walls are closed and opened downward;
A high-voltage power supply unit and a control unit disposed in an upper region of the case and arranged side by side in the longitudinal direction of the case;
An air unit located below the case and spaced from the high-voltage power supply unit and the control unit, and extending in the longitudinal direction of the case and forming an independent air passage isolated from the atmosphere in the case;
A discharge electrode assembly that supports the discharge electrode, and a plurality of discharge electrode assemblies attached at intervals in a longitudinal direction of the air unit;
The air unit includes a plurality of cylindrical portions that are spaced apart in the longitudinal direction and project downward.
The discharge electrode assembly is detachably assembled to the air unit by fitting the discharge electrode assembly to the cylindrical portion,
By mounting the discharge electrode assembly on the cylindrical portion of the air unit, the air supplied from the air source is distributed to each discharge electrode assembly via the independent air passage of the air unit, and each discharge electrode assembly The discharge electrode bar, wherein the air distributed to the discharge electrode is discharged to the outside from the vicinity of the discharge electrode. The discharge electrode assembly has a small diameter portion extending along the discharge electrode, and an outer cylinder portion coaxial with the small diameter portion and detachably fitted to the cylindrical portion of the air unit,
The discharge electrode bar according to claim 1, wherein an air discharge passage from the air unit to an air discharge port in the vicinity of the discharge electrode is formed by mounting the discharge electrode assembly on a cylindrical portion of the air unit. .   The air unit is provided with a contact point with which a rear end surface of the discharge electrode contacts in order to supply the high voltage generated by the high-voltage power supply unit to the discharge electrode, and the contact point is isolated from the air discharge passage. Item 3. The discharge electrode bar according to Item 2.   The discharge electrode bar according to any one of claims 1 to 3, wherein the high-voltage power supply unit is enclosed in a sealed box. At the lower end of each of the left and right side walls of the case, has a groove extending in the longitudinal direction of the case,
5. The discharge electrode according to claim 1, wherein the air unit has a protrusion that is received in the groove, and the air unit is attached to the case by engagement of the groove and the protrusion. bar.   The discharge electrode bar according to claim 5, wherein the protrusion of the air unit is constituted by a protrusion extending in the longitudinal direction of the air unit.   The discharge electrode bar according to any one of claims 1 to 6, further comprising a partition wall positioned between the high-voltage power supply unit and the control unit and the air unit below the high-voltage power supply unit and the control unit. A GND plate disposed over the lower ends of the left and right side walls of the case and disposed so as to cover the open lower end of the case;
The GND plate has an opening with an edge spaced from the outer contour of the discharge electrode assembly, and the opening prevents a creeping path between the edge of the opening and the discharge electrode assembly. The discharge electrode bar according to any one of claims 1 to 7, having a size that can be measured.   The said case is comprised by the two division | segmentation cases which can be divided | segmented into right and left, and when these two division | segmentation cases are assembled, the said case has the reverse U-shaped cross-sectional shape opened toward the downward direction. The discharge electrode bar according to any one of the above.   By receiving the protrusion extending in the longitudinal direction formed in one of the two divided cases in a groove formed in the other divided case, the two divided cases are integrated by slide engagement. The discharge electrode bar according to claim 9.   The discharge electrode bar according to claim 9 or 10, wherein the high-voltage power supply unit and the control unit can be assembled in a state where the two divided cases are separated. An end cap covering the opening at each end in the longitudinal direction of the case;
The discharge electrode bar according to claim 11, wherein air is supplied from an air source to the air unit through an air port of the end cap.

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