JPH0773690B2 - Electric shock prevention device for electric dust collector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electrostatic electrodeposition type electrostatic precipitator in which electric shock is prevented by quickly eliminating residual charges when removing a dust collecting element to prevent electric shock. The present invention relates to a protection device, and more particularly to the electric shock protection device suitable for being applied to a ceiling-embedded electrostatic precipitator.

(Prior Art) An electrostatic type electrostatic precipitator that collects dust by electrostatic electrodeposition after charging dust floating in the air must be removed and cleaned or replaced because the dust collecting part must be taken out. It has a structure that can be put in and taken out almost.

By the way, since a high voltage is applied to the anode side of the dust collection part that is put in and taken out in this way and there is a residual charge, as a measure to prevent the risk of being hit by electric shock when taking out, the dust collector body is conventionally used. When the lid is opened, the short-circuit mechanism works in tandem with this to remove the residual charge.
No. 29657, Japanese Patent Laid-Open No. 60-261561), a device for connecting a self-discharge resistor in parallel to a high voltage power supply circuit of a dust collector to quickly discharge when the operation is stopped (Japanese Utility Model Publication No. 54-20692), etc. Safety devices have been proposed.

However, since the safety device proposed in the above-mentioned Japanese Utility Model Publication No. 45-29657 only makes contact between both electrodes due to its own weight, the contact itself is unstable and there is still a risk of being shocked by electric charges when the dust collecting part is taken out. In addition, JP-A-60-2615
The safety devices proposed in Japanese Patent No. 61 and Japanese Utility Model Publication No. 54-20692 have sufficient functions in that discharge can be performed instantaneously when the dust collecting part is a parallel plate type and has a structure with low capacitance and inductance. However, if the dust collecting part has a structure in which the anode is molded with an insulator and is placed close to the dust collecting plate and overlapped, operation is stopped because dielectric polarization occurs in the insulator during dust collecting operation. Even after that, the residual charge does not disappear for a long time, so even after taking out the short circuit between the anode and the dust collecting plate on the main body side, there is residual charge on the surface of the anode even if the dust collecting part is taken out, It was found that a high voltage was generated between the anode and the dust collecting plate due to this effect, and that an electric shock was often received.

Moreover, recently, as shown in FIG. 6, it is installed in the back of the ceiling, and its both ends are exposed to the opening of the ceiling plate so that the suction port (22) and the air outlet (2
In the air duct (21) formed in 3), a dust collector unit (24) as an air cleaner and a cooler unit (25) are installed in series from the windward side, and the dust collector unit (24) is pre-installed. The filter (26), the electrostatic electrodeposition type dust collecting element (27) and a high voltage generator (not shown) are housed in the main body casing (28), while the cooler unit (2
5) Casing (3) for fan (29) and cooler (30)
1) The room air that is housed inside and sucked in through the suction port (22) is cleaned by collecting dust in the dust collector unit (24), and then cooled to a predetermined temperature by the cooler unit (25) and blown out. From (23), a so-called ceiling-embedded type has been proposed, in which cold air is blown out into the room so that the air conditioning in the room can be covered, but in this type,
The electric dust collector that is the dust collector unit usually has a plurality of dust collecting elements (27) connected to each other as shown in the figure. When taking out the dust collecting element (27), the dust collecting element (27) is pulled out to the side in the connected state. It is not suitable for applying the safety device that operates in conjunction with opening and closing of the lid as described above.

Therefore, the applicant of the present invention focused on the above-mentioned problems and further studied to improve the problems, and short-circuited the anode and the dust collecting electrode plate in association with the taking out to the dust collecting part itself having a structure capable of putting in and out. I proposed to equip the gain switch.
(Japanese Patent Application No. 1-117977) (Problems to be solved by the invention) However, in the switch according to the above proposal, it can be said that electric shock can be prevented by interlocking with the removal of the dust collecting element.
It has a surface which is not yet sufficient for application in an electrostatic precipitator including a plurality of dust collecting elements embedded in the ceiling as described above.

Thus, the present invention addresses the above-mentioned problems, and it is an object of the present invention to further expand the proposed electric shock preventive device and to apply it to a ceiling-embedded dust collector in which a plurality of dust collecting elements are connected, and particularly to electric By installing an earth switch for each dust collecting element and connecting the frame and the anode when taking out the element, attach the earth switch lever so that the dust collecting element can be slid and installed, and maintain a sufficient insulation distance when mounting the casing. The purpose is to effectively prevent electric shock even when a plurality of dust collecting elements are accommodated.

(Means for Solving the Problem) In order to meet the above-mentioned object, the present invention is basically a frame body (9).
In an electrostatic precipitator in which a dust collecting element (1) made of a conductive material is mounted in an element accommodating portion (2) of a main body casing so as to be able to be taken in and out, a positive rotation is rotatably supported by a support shaft and a positive spring (15) is used. Contact (14) biased in the rotating direction
A high-voltage connection terminal (10) with which the contactor (14) comes into contact by its normal rotation, and one end contacts the contactor (14) and the other end projects from the dust collecting element frame (9). An earth switch lever (1) that is slidable in the axial direction and reversely rotates the contact (14) by sliding against the spring (15).
6) are respectively provided on the dust collecting element (1),
The structure of the electric shock preventive device is characterized in that a mountain-shaped earth switch guide (18) is provided in a position facing the earth switch lever (16) on the inner wall of the element housing portion (2) along the direction in which the dust collecting element is taken in and out.

Further, the present invention is applied to the electrostatic precipitator in which a plurality of dust collecting elements are connected to each other, and a plurality of the dust collecting elements (1) are connected to the element accommodating portion (2) by sliding. It is mounted so that it can be put in and taken out, and the mounting position of the earth switch lever (16) of each element is arranged so that each earth switch lever (16) passes through different parts of the accommodating part (2) when the element is put in and out by sliding. A plurality of mountain-shaped earth switch guides (18) corresponding to the switch levers (16) are provided on the inner wall of the element accommodating portion (2) corresponding to the respective earth switch levers (16).

(Operation) In the electric shock preventer according to the present invention configured as described above, when the dust collecting element is taken out from the element housing portion, the earth switch guide contact side of the earth switch lever becomes a free end, and the contact is rotated by the spring. , Join with high voltage connection terminal.

The contact terminal is connected to the anode plate of the dust collecting element, while the dust collecting electrode is connected to the frame body.Therefore, when the two are joined as described above, the contactor is connected to the earth switch lever and the frame body. This is grounded and held in this state by the spring, and the residual charge is completely discharged.

Further, when a plurality of dust collecting elements are connected in series according to the invention described in claim 2 and the electric shock preventive device is attached to each element, the positions of the respective earth switch levers and earth switch guides are changed. When pulling out each element, the earth switch lever of each element does not engage with the earth switch guide of the other element, so that the respective dust collecting elements do not interfere with each other and the short circuit state is maintained as described above. , The residual charge is discharged.

(Example) Hereinafter, an example of the present invention is described based on an accompanying drawing.

FIG. 1 shows a main structure of an electrostatic precipitator equipped with a device according to the present invention, in which a dust collecting element (1) is slidably mounted in an element housing section (2) of a main body casing. ing.

The dust collecting element (1) includes, as shown in (a) and (b) of FIG. 4, an ion portion (5) composed of an ionization wire (3) and an opposing ground electrode plate (4), an anode plate (6), and It has a publicly known structure in which front and rear dust collecting electrode plates (7) are arranged parallel to each other, and a flat elliptical dust collecting portion (8) wound in a coil shape is provided. The outer frame (9A), (9B), which is formed as a unit, is integrally formed as shown in FIGS. 1 and 2, and the ionization line (3) has, for example, a series high voltage of 5 KV and an anode plate. By applying a high voltage of 2 KV, for example, to (6), an electrostatic electric field is formed between the opposing ground electrode plate (4) and the grounded dust collecting electrode plate (7). .

Here, the outer frame (9A) of the ionization part (5) and the dust collecting part (8)
The outer frame (9B) of each is molded by a conductive material such as a metal plate, and the opposite ground electrode plate (4) is provided on the outer frame (9A) of the ionization part (5) outside the dust collecting part (8). The dust collecting electrode plate (7) is grounded to the frame (9B), and the outer frame (9) is
B), (9A) below the connection terminals (10), (1
0) 'are protruding, and these connecting terminals (1
0) and (10) 'are insulated and fixed to the outer frames (9B) and (9A), respectively, and the ionization wire (3) in the ionization section (5) and the dust collection section (8) in the ionization section (5). The anode plate (6)
Are connected to each other.

Then, the dust collecting element (1) consisting of the ionization part (5) and the dust collecting part (8) integrally connected is placed on a rail (11) formed by being installed in the main body casing as shown in FIG. It is slidable along the rail (11) so that it can be freely taken in and out.

However, in the present invention having the above-mentioned structure, the ground switch lever (16) and the supporting member (1) as shown in FIGS.
A ground switch consisting of 7) is provided.

That is, in FIGS. 2A and 2B, (14) is a contactor, which is rotatably supported by a support shaft installed in the dust collecting part (8) and is supported by a spring (15). The rotation is biased in the forward direction (rotation to the left in the figure), and the forward rotation biased by the spring (15) causes one end of the contact (14) to move to the connection terminal (10). ) Can be engaged with one end. On the other hand, on the other end side of the contactor (14), a metal earth switch lever for rotating the contactor (14) in the reverse direction (to the right in the figure) against the spring (15). The frame of the dust collecting element (1) is such that the one end (16) contacts the contactor (14) and the other end projects outwardly from the dust collecting element frame body (9) and can slide in the axial direction. It is supported by a support member (17) fixed to the body (9) with screws or the like as shown in FIG.

Reference numeral (18) is an earth switch guide corresponding to the earth switch lever (16), and is arranged on the inner wall of the element housing portion (2) in a mountain shape corresponding to the earth switch lever (16), Usually made of metal, when the dust collecting element (1) is housed in the element housing part (2) along the rail (11), the earth switch lever (1
The protruding side end of 6) abuts and the earth switch lever (1
6) is pushed inward.

Thus, when accommodating the dust collecting element (1) in the accommodating portion (2), the earth switch guide (1
The earth switch lever (16) is pushed inward by the chevron projection of (8), whereby the contactor (14) rotates against the spring (15), and the connecting terminal (10) and contactor (1).
4) The state where they are separated from each other enables normal operation of the dust collector.

On the other hand, when the dust collecting element (1) is pulled out to the side, the protruding end of the earth switch lever (16) is on the free side, so the contact (14) is rotated by the spring (15). , The contact (14) and the high-voltage connection terminal (10) are joined, and the frame (9) and the anode plate (6) are electrically connected to each other, and the anode plate (6) and the dust collecting electrode plate (7) are connected. A short circuit occurs and a complete discharge of the residual charge is realized.

The above description has been made on the case where the ground switch lever (16) and the ground switch guide (18) correspond to each other as the basis of the electric shock preventive device of the present invention. However, these ground switch lever (16) and ground switch guide (18)
The number of dust collecting elements (1) is not limited to one. For example, in the case of a ceiling-embedded air conditioner that stores a plurality of dust collecting elements (1) connected as shown in FIG. It is possible to arrange the same number.

FIG. 5 is a specific example of such a case, in which the earth switch lever (16) and the earth switch guide (18) are installed corresponding to the dust collecting elements (1) and (1), respectively. In this case, it is necessary to prevent the earth switch lever (16) and the earth switch guide (18) of each dust collecting element (1) from interfering with each other.

Therefore, as shown in the figure, each dust collecting element (1)
The positional relationship between the earth switch lever (16) and the earth switch guide (18) is that when the element is slid in the connecting direction and is put in and out, each earth switch lever (1
Each ground switch lever (16) is provided so that 6) passes through different parts of the housing part (2), and the earth switch guide (18) is provided on the inner wall of the element housing part (2) corresponding to the ground switch lever (16). ) Are respectively provided, and the positions of the earth switch lever (16) and the earth switch guide (18) in the dust collecting element (1) on the left side of the figure are higher than those in the dust collecting element (1) on the right side of the figure, respectively. It is in the position.

Of course, although the height is given in FIG. 5, the height may be shifted to the left or right depending on the sliding direction of the plurality of dust collecting elements, or both may be used together.

Thus, even when the dust collecting elements are connected, it is possible to prevent the electric shock of the individual dust collecting elements in the same manner as in the above case.

(Effects of the Invention) In the present invention, as described above, the contactor that comes into contact with and separates from the high-voltage connection terminal and the earth switch lever that rotates the contactor are installed in the dust collecting element and the earth switch guide is housed in the element. The ground switch lever is attached to and removed from the ground switch guide when the dust collection element is taken in and out. In the state where the contactor is pulled out from the element accommodating portion of the main body casing and separated, the contactor is joined to the high-voltage connecting terminal, thereby rapidly discharging the residual charge and neutralizing the charge. A highly safe electrostatic precipitator can be obtained.

According to the second aspect of the present invention, the earth switch lever is provided so that each earth switch lever passes through a different portion of the accommodating portion when the element is slid into and out of each of the plurality of dust collecting elements, while the earth switch guide is provided. Since it is provided corresponding to this, there is an effect that when the dust collecting element is pulled out, the remaining electric charges can be surely completely discharged to each without engaging with the other earth switch levers.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing the configuration of the main part of an electrostatic precipitator equipped with the device according to the present invention, and FIGS. 2 (a) and 2 (b) are the earth switch lever and earth switch guide that characterize the present invention. In the figure showing the relationship with (a), the dust collecting element is stored and (b) is the same. FIG. 3 is a perspective view of the earth switch lever, FIG. 4 is an exploded view of the dust collecting element of FIG. 1, (a) shows an ionization part, and (b) shows a dust collection part. FIG. 5 is a perspective view of a dust collecting element equipped with the device of the present invention in the case of a ceiling-embedded type, and FIG. 6 is a schematic explanatory view of a ceiling-embedded air conditioner. (1) …… Dust collecting element, (2) …… Element housing, (9) …… Frame, (10) …… High-voltage connection terminal, (14) …… Contact, (15) …… Spring , (16) …… Ground switch lever, (18) …… Ground switch guide.

Claims (2)

[Claims] 1. An electrostatic precipitator in which a dust collecting element (1) whose frame (9) is made of a conductive material is mounted so that it can be taken in and out of an element accommodating portion (2) of a main body casing,
A contactor (14) pivotally supported by a support shaft and urged in a forward rotation direction by a spring (15), and a high-voltage connection terminal () for contacting the contactor (14) by the forward rotation ( 10) and one end of the contactor (14) and the other end of the contactor (14) protruding from the dust collecting element frame body (9) and slidable in the axial direction. ) Is provided in the dust collecting element (1), and the dust collecting element is inserted and removed in a position facing the earth switch lever (16) on the inner wall of the element housing (2). An electric shock preventive device for an electrostatic precipitator, which is provided with a mountain-shaped earth switch guide (18) along the line. 2. A plurality of dust collecting elements (1) according to claim 1 are connected to each other, and the dust collecting elements (1) are slidably mounted in the element accommodating portion (2) in the connecting direction, and the earth switch lever (16) is attached to each element. The position is set so that each earth switch lever (16) passes through a different part of the accommodating portion (2) when the element is slid in and out, and a plurality of mountain-shaped earth switch guides corresponding to each earth switch lever (16) are provided. An electric shock preventive device for an electrostatic precipitator, in which (18) is provided on the inner wall of the element housing (2) corresponding to each earth switch lever (16).