JPH0719120Y2 - Indoor static eliminator - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to an indoor static eliminator which is installed on a ceiling of a clean room or a general office and removes static electricity in the room by applying a high DC voltage.

[Prior art]

Conventionally, such an indoor static eliminator has been shown in FIG. This indoor static eliminator contains a DC high-voltage power supply (not shown) in a horizontally long case A, one positive electrode needle B on one of the left and right ends of the lower surface of the case A, and one on the other.
Negative electrode needles C are provided in a protruding manner, and positive and negative high DC voltages are applied to the electrode needles B and C from a DC high voltage power source to generate ions between the electrode needles B and C. Generally, this indoor static eliminator is installed and used on the ceiling surface D of a clean room where air is blown from the ceiling.

[Problems to be solved by the device]

However, in this conventional indoor static eliminator, the plus and minus ion amounts of the positive electrode needle B and the negative electrode needle C are approximately the same, that is, ion removal with ion balance is possible. Ion imbalance occurs on the left and right sides of C. That is, the area between the plus electrode needle B and the minus electrode needle C is the neutralization area, and the plus electrode needle B
Outside is a positive charging area, and the outside of the negative electrode needle C is a negative charging area. In the positive charging area and the negative charging area, the charging phenomenon occurs conversely, and the air in the room or the object to be neutralized is charged to the positive electrode needle B side. In some cases, positive charging was performed, and in some cases, the negative electrode needle C side was negatively charged. The present invention aims to solve such a problem with a simple configuration.

[Means for Solving the Problems]

The indoor static eliminator according to the present invention has a positive electrode and a negative electrode, to which positive and negative DC high voltages are respectively applied by the DC high voltage power source, at both ends of the outer surface of the case containing the DC high voltage power source. Two pairs are provided so as to be separated from each other, and these two pairs of positive electrodes and negative electrodes are arranged on a diagonal line. Further, in each of the two sets, a current detection electrode is provided between the plus electrode and the minus electrode, and a positive voltage applied to the plus electrode from the direct current high voltage power source by the detection current of this current detection electrode and a minus electrode. An ion balance control circuit for controlling at least one of the applied negative voltage can be provided in the case.

[Action]

According to such an indoor static eliminator, ions can be generated at both ends of the case,
Not only the middle part of the case, but also the outside of both ends can be a neutralization region with a positive and negative ion balance, so effective static elimination can be performed over a wide range.
Moreover, since the two sets of electrodes are arranged in a diagonal line in which plus and minus are reversed, even if there are two sets of electrodes, it is possible to eliminate static electricity on average without causing uneven distribution of positive ions or negative ions between them. . Further, if the ion current is detected by the current detection electrode and the voltage applied to the plus electrode or the minus electrode is adjusted according to the plus / minus magnitude of the ion current value, the ion balance can be further stabilized.

【Example】

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a bottom view of an indoor static eliminator according to the present invention, and FIG. 2 is a front view. This indoor static eliminator has a form in which a horizontally long rectangular case 1 is hung on a ceiling in a room or attached by a mounting bracket for use. The left and right ends of the lower surface 2 of the case 1 are provided with a large number of slits 3 in a circular region to form left and right outlets 4. Further, on the lower surface 2, a pair of positive electrodes 5 and a pair of negative electrodes 6 are arranged in front of and behind the air outlet 4 so as to face each other. These two sets of positive electrode 5 and negative electrode 6 are
Plus and minus are diagonally arranged, and the front and back are left and right on the plus and minus sides. Further, on the lower surface 2 between the left and right outlets 4, between the left and right positive electrodes 5 and negative electrodes 6 and the outlets 4 respectively.
Current detection electrodes 7 are provided in the vicinity of the peripheral edge of each of them. The plus electrode 5 and the minus electrode 6 have substantially the same structure. As shown in FIG. 3, an electrode needle 9 is inserted into a cylindrical electrode holder 8 located in the case 1, and the upper end of this electrode needle 9 is inserted. The screw portion 9a is screwed to the upper end of the electrode holder 8, and the electrode protection cap 10 is screwed to the lower end of the electrode holder 8 from the outside of the case 1 to protrude from the lower surface 2 of the case 1.
The lower end of the above is covered with the electrode protection cap 10. As in the case of the plus electrode 5 and the minus electrode 6, the current detection electrode 7 is screwed onto the electrode holder 8 as shown in FIG. 4, and the lower end of the electrode holder 8 is covered with an electrode protection cap. 10 is screwed, but electrode rod 11
The lower end of the electrode protrudes downward from the electrode protection cap 10. FIG. 5 shows only a part of the electrical connection structure in the case 1, that is, only one of the left and right structures. A plus DC voltage is applied to the plus electrode 5 (specifically, the electrode needle 9) from the plus high voltage generation circuit 12 through the rectifier circuit 13 and the current limiting resistor 14, and the minus electrode 6 is minus. A direct current minus high voltage is applied from the high voltage generation circuit 15 through the rectifier circuit 16 and the current limiting resistor 17. The positive high voltage generation circuit 12 and the negative high voltage generation circuit 15, which are DC high voltage power supplies, are supplied with the DC voltage from the rectifier circuit 18 connected to the general AC power supply, and generate positive and negative DC high voltages, respectively. To do. The current detection electrode 7 (specifically, its electrode rod 11) is connected to an ion balance control circuit 19 that controls the positive high voltage generation circuit 12 and the negative high voltage generation circuit 15, and the ions detected by the current detection electrode 7 are detected. When the positive side of the current is large,
The output voltage of the plus high-voltage generating circuit 12 is lowered, and when there are many minus sides, the output voltage of the minus high-voltage generating circuit 15 is lowered.
Ion balance is achieved between the plus electrode 5 and the minus electrode 6. When the detection current of the current detection electrode 7 rises or falls above a predetermined level, that is, when the plus / minus ion imbalance exceeds a predetermined level, the buzzer 20 sounds, and when it further advances, the plus high voltage generation circuit 12 and the minus high voltage The generation circuit 15 is adapted to be stopped. In addition,
Ion balance can be achieved even if only the output voltage of one of the positive high voltage generation circuit 12 and the negative high voltage generation circuit 15 is adjusted and the other is fixed. Fans 21 are provided in the case 1 so as to face the left and right outlets 4, respectively. The fan 21 is driven by an AC power source. Since this indoor static eliminator is configured as described above, DC corona discharge is generated by the plus and minus electrodes 5 and 6 at each of the left and right ends of the case 1, and the resulting ions are ejected from the outlets 4 on the left and right respectively. It is sent away by the wind. Therefore, positive and negative ions are sent in equal amounts not only directly below the left and right end portions of the case 1 and below the left and right portions but also to the left and right outer sides of the left and right ends of the case 1. Moreover, in each of the right and left sides, the ion current is detected by the current detection electrodes 7, and the output voltage of the plus high voltage generation circuit 12 and the minus high voltage generation circuit 15 is automatically adjusted according to the plus / minus magnitude of the ion current. Can always be achieved.

[Effect of device]

According to the indoor static eliminator according to the present invention, ions can be generated at each of both ends of the case, so that not only the middle part of the case but also the outside of both ends is balanced with positive and negative ions. Since it can be a neutralization area, effective static elimination can be performed over a wide range. Moreover, the two sets of electrodes are arranged in a diagonal line with positive and negative sides reversed, so even if there are two sets of electrodes,
The charge can be removed to an average without causing uneven distribution of positive ions or negative ions among them. Further, when the ion current is detected by the current detection electrode and the voltage applied to the plus electrode or the minus electrode is adjusted according to the plus or minus of the ion current value, the ion balance is further stabilized. Can be realized.

[Brief description of drawings]

FIG. 1 is a bottom view of an indoor static eliminator according to the present invention, FIG. 2 is a front view of the same, FIG. 3 is an enlarged sectional view of positive and negative electrodes, and FIG. 4 is an enlarged sectional view of a current detection electrode. FIG. 6 is a block diagram of a part of the electrical connection structure, and FIG. 6 is a front view of a conventional example. 1 ... Case, 4 ... Air outlet, 5 ... Positive electrode, 6 ...
… Negative electrode, 7 …… Current detection electrode, 12 …… Plus high voltage generating circuit, 13 …… Minus high voltage generating circuit, 19 ……
Ion balance control circuit, 21 ... fan.

Claims (2)

[Scope of utility model registration request] 1. A positive electrode and a negative electrode, to which positive and negative DC high voltages are respectively applied by the DC high voltage power source, are separated from each other at both ends of the outer surface of a case containing the DC high voltage power source. An indoor static eliminator characterized in that two pairs of each pair, and these two pairs of positive electrodes and negative electrodes are arranged on a diagonal line. 2. A current detecting electrode is provided between the positive electrode and the negative electrode in each of the two sets, and a positive voltage applied from the direct current high voltage power source to the positive electrode by a current detected by the current detecting electrode. The indoor static eliminator according to claim 1, wherein an ion balance control circuit for controlling at least one of a negative voltage applied to the negative electrode and the negative electrode is provided in the case.