JPH082426B2 - Electric shock prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to an air purifier that collects dust by an electrostatic precipitating element loaded with a high voltage, and prevents electric shock when removing the electrostatic precipitating element. Regarding prevention device.

<Prior Art> Conventionally, dust floating in the air is positively charged, and the dust collecting electrode plate is negatively charged.
Some air purifiers collect dust by adhering the dust to the dust collecting electrode plate.

In this air purifier, the electrostatic precipitator element must be taken out and cleaned or replaced. But,
Since a high voltage is applied to the anode of the electrostatic precipitator element, residual charge remains in the electrostatic precipitator element even after the power supply is stopped. When taking out the dust element, there was a problem that a person was hit by electric shock.

In view of this, there is provided an electric shock preventive device in which the residual charge of the electrostatic precipitating element is eliminated inside the electrostatic precipitating element in association with the operation of taking out the electrostatic precipitating element.

<Problems to be Solved by the Invention> By the way, in an air conditioning system in which an air conditioner is arranged in a space above the ceiling and the space above the ceiling is used as a duct, the air purifier is provided near a suction port on the ceiling surface. There has been proposed a device which is arranged and uses air blown by an air conditioner to perform air cleaning. In this case, a relatively large-sized air cleaner to which a plurality of electric dust collecting elements are attached is usually used, and power is supplied to each electric dust collecting element from the power supply terminals for the anodes which are parallel to each other.

However, even if the above-mentioned electric shock preventive device is applied to the air cleaner having a plurality of electric dust collecting elements, the electric shock as described below could not be prevented.

That is, in the above electric shock preventive device, in the state in which an arbitrary electrostatic precipitating element is removed from the air cleaner, the electric charge possessed by the removed electrostatic precipitating element itself is removed, but it has not been removed yet. The other electrostatic precipitator element is in a charged state. In addition, the power source terminal for the anode that was supplying power to the anode of the removed electric dust collecting element is exposed, and the other electric dust collecting element in a charged state is exposed to the exposed power source terminal for the anode. Is being applied. Therefore, if a hand or the like touches the exposed anode power source terminal, an electric shock will occur.

In view of the above problems, the present invention can prevent electric shock from an electric dust collecting element that has not been removed yet in a state in which any electric dust collecting element of the plurality of electric dust collecting elements is removed. It is intended to provide an electric shock preventive device.

<Means for Solving the Problems> In order to achieve the above object, an electric shock preventive device according to the present invention is provided with a high voltage supply for applying a high voltage to a plurality of electric dust collecting elements and an anode of each electric dust collecting element. Source, a frame body that can store each electrostatic precipitating element individually and detachably,
A plurality of anode power supply terminals provided on the frame body, connected in parallel to each other through a branch point with respect to the high voltage supply source, and exposed when the electrostatic precipitating element is removed from the frame body; and An electric shock preventive device mounted on an air purifier having a conductive housing for removably accommodating the frame body, wherein the branching point is provided on the frame body and interlocks with the frame body removing operation. And a discharge switch for short-circuiting the anode power source terminal of the frame and the housing on the higher voltage supply side.

<Operation> According to the electric shock preventer having the above-described configuration, when the frame body is taken out from the housing, the discharge switch can be interlocked with the take-out operation to short-circuit the conductive housing and the anode power supply terminal. , The residual electric charges of the respective electrostatic precipitating elements still attached to the frame can be discharged to the housing through the respective anode power supply terminals connected in parallel with each other. Therefore, when an arbitrary electrostatic precipitator element is removed from the frame body in this taken-out state, the connection with the removed electrostatic precipitator element is released, and the anode power supply terminal in the exposed state is still untouched. No voltage is applied from another electrostatic precipitator element attached to the frame.

Moreover, the discharge switch is for short-circuiting the plurality of anode power supply terminals connected in parallel to each other through the branch point to the conductive housing on the side of the high voltage supply source that is higher than the branch point. By sharing the same discharge switch, it becomes possible to short-circuit the plurality of anode power supply terminals at the same time.

<Examples> Detailed description will be given below with reference to the accompanying drawings showing examples.

FIG. 14 is an exploded perspective view showing an air purifier including an electric shock preventive device according to an embodiment of the present invention. In FIG. 14, an air conditioner 91 is arranged in a ceiling space 90 and a ceiling space is provided. In an air conditioning system B using 90 as a duct, an air purifier A is arranged near a suction port 93 formed in a ceiling surface 92. 94 is an outlet. The air purifier A uses the air blow of the air conditioner 91 to clean the air.

Referring to FIGS. 1 to 3, the air purifier A includes a housing 1 disposed in a space 90 above the ceiling, an upper position (see FIG. 2) housed in the housing 1, and the housing 1. A frame body 2 that is vertically movable between a lower position (see FIG. 3) that is taken out downward, a plurality of electrostatic precipitating elements 3 that are detachably accommodated in the frame body 2, and an upper portion of the frame body 2. And a discharge switch 4 provided in the.

Referring to FIG. 1 and FIG. 14, the housing 1 is a top plate.
11 and a guide member 12 formed of a pair of channel members, and is disposed in the ceiling space 90 in a state of being suspended by a stay 96 on an upper plate 95 above the suction port 93.

The frame body 2 includes an upper plate 21, a bottom plate 22, a pair of side members 23 and 24, a pair of rail members 25 and 26, and a partition portion 27. The partition portion 27 is sandwiched between the pair of element storage portions 5 and Has been formed. The electric dust collecting element 3 is stored in and removed from the element storage portion 5 from the front. The pair of rail members 25 and 26 are arranged above and below the front surface of the frame body 2, and the pre-filter 6 is introduced from the side. The pre-filter 6 removes relatively large dust and supports the filter member 62 by the frame member 61.

On the front surface of the frame body 2, the side member 23 and the partition member 27
Each of them is provided with an element stopper 7 for preventing the electrostatic precipitating element 3 from falling out of the element storage portion 5 (see FIGS. 2 to 4).

With reference to FIGS. 2 to 4, the element stopper 7 has the stopper piece 71 engaged with the front surface of the electrostatic precipitator element 3 housed in the element housing part 5, whereby The element 3 is restricted from falling off to the front. The stopper piece 71 is rotatably provided around a screw 74 serving as a pivot while being sandwiched between a pair of mounting members 72 and 73 screwed to the side member 23 or the partition member 27. , A torsion spring 75 loosely fitted in the screw 74
Is elastically urged in the clockwise direction in the figure (in the direction in which the fall of the electrostatic precipitating element 3 is restricted).
By rotating the stopper piece 71 counterclockwise against the torsion spring 75, the stopper piece 71 retracts from the extraction path of the electrostatic precipitator element 3 and allows the electric precipitator element 3 to be taken out.

Further, referring to FIG. 2 and FIG. 5, by engaging the bottom plate 22 of the frame body 2 with the locking member 9 having the Ω type cross-sectional shape, which is provided at the lower portion of both inner side portions 1 a of the housing 1. A pair of frame body stoppers 8 for holding the frame body 2 at the upper position are attached.

The frame stopper 8 has substantially the same structure as the element stopper 7, and the housing 1 is provided with screws 86.
A pair of mounting members 82, 83 mounted on the frame, and a projecting position (see FIGS. 5 and 6) projecting into the take-out path of the frame body 2 in a state of being sandwiched between the mounting members 82, 83 and the frame. Retracted position that allows the body 2 to be taken out (see FIGS. 7 and 8).
(See the drawing) and a stopper piece 81 which can be rotated and retracted around a screw 84, and a torsion spring 85 which elastically biases the stopper piece 81 to a projecting position.

As shown in FIG. 7, the locking member 9 engages with the upper end 2a of the frame body 2 at the lower position to hold the frame body 2 at the escape position.

The electrostatic precipitator element 3 is of a so-called scroll type, and includes a frame member 31, a laminated body 32 housed in the frame member 31, an anode contact 33 and an ionization wire contact 34 protruding from the frame member 31. Become.

The laminated body 32 is a long anode 32a in which the periphery of an electrode plate made of a flat metal foil is molded with an insulating synthetic resin, and a long foil made of a metal foil provided with a large number of wavy projections at predetermined intervals in the longitudinal direction. It is formed by contacting and overlapping the dust collecting electrode 32b of, and winding it in a flat elliptical coil shape.
A large number of elongated voids divided between a and 32b penetrate through the front and back.

At the outer winding end of the laminated body 32, the anode 32a and the dust collecting electrode 32b are separated, the anode 32a is connected to the anode contact 33, the end of the dust collecting electrode 32b is a frame. Member 31
Is fixed in contact with.

The ionization wire contactor 34 is connected to an ionization wire 36 (see FIG. 13) that irradiates an ion shower to positively charge dust.

The electrostatic precipitator element 3 is provided with a ground switch 35 that short-circuits the anode contact 33 and the frame member 31 in tandem with the operation of removing the electrostatic precipitator element 3 from the element housing portion 5 of the frame body 2. The ground switch 35 is provided so that the electric charge remaining in the electrostatic precipitator element 3 itself can be quickly eliminated. The structure of this earth switch is similar to that of the discharge switch 4.

Anode power supply terminals 13 and ionization wire power supply terminals 14 are mounted in the element housing portion 5 of the frame body 2 via insulators 15. With the electrostatic precipitator element 3 stored in the element storage portion 5, the anode power supply terminal 13
Connected to the anode contact 33, the ionization line power supply terminal 14
Is connected to the contact 34 for the ionizing wire.

The insulator 15 attached to the partition 27 is provided with the discharge switch 4 in a state where the power source terminal 13 for the anode is brought close to the insulator 15.

Referring to FIGS. 9 and 10, this discharge switch 4
Via the mounting member 41 fixed to the insulator 15 with screws 45
The contactor 42 is rotatably attached to the contactor 42, and the torsion spring 43 as a biasing means for biasing the contactor 42 to rotate clockwise in FIG. 44 is a collar for keeping a predetermined space between the attachment member 41 and the contact 42.

The contact 42 has a lower end portion 42b in a state where the casing 2 is housed in the housing 1 (the frame body 2 is at the upper position).
Is separated from the anode power supply terminal 13 (see FIG. 11), and the lower end portion 42b can contact the anode power supply terminal 13 when the frame 2 is taken out (see FIG. 12). The portion 42a penetrates the through hole 21b of the upper plate 21 and engages with the top plate 11 of the housing 1.

FIG. 13 is a schematic wiring diagram of the air purifier. Referring to FIG. 13, power is supplied from the power supply section 16 to the high-voltage power supply unit 18 via the pair of door switches 17a and 17b. The terminal portion 18a of the high-voltage power supply unit 18 is connected to the pair of ionization line power supply terminals 14 that are parallel to each other, and the ionization line 36 is connected via the ionization line contacts 34 connected to the respective ionization line power supply terminals 14. For example, a power supply of about 5 kv is supplied. The terminal portion 18b is connected to a pair of anode power source terminals 18b that are parallel to each other via a branch point a, and the anode 32a is connected via the anode contactor 33 connected to each anode power source terminal 18b.
For example, a power supply of about 2 kv is supplied.

The earth switch 35 is provided in a path for grounding the anode 32a, and the discharge switch 4 is provided in a path for grounding the anode power supply terminal 13 closer to the power supply section 16 than the branch point a.

According to this embodiment, when the frame body 2 is taken out from the housing 1, the contact 42 urged by the torsion spring 43 is interlocked with this take-out operation and the frame body 2 is lowered by a predetermined distance from the storage position. At this point, the lower end portion 42b is brought into contact with the anode power supply terminal 13 while keeping the upper end portion 42a and the top plate 11 engaged with each other. As a result, the contact 42 causes the anode power supply terminal 13
And the top plate 11 of the conductive housing 1 are short-circuited, and the residual charges of all the electrostatic precipitating elements 3 are discharged to the conductive housing 11 via the power supply terminals 13 for the anodes connected in parallel with each other. Can be made.

Therefore, when the optional electrostatic precipitating element 3 is removed from the frame body 2 in the taken-out state, the connection with the removed electrostatic precipitating element 3 is released and the anode power supply terminal 13 in the exposed state is disconnected. In addition, the voltage is not applied from the other electrostatic precipitator element 3 still attached to the frame body 2, which is safe.

Moreover, since the electric dust collecting element 3 itself is also provided with the earth switch 35, the electric discharge continues inside the electric dust collecting element 3 even after the electric dust collecting element 3 is removed. Even if a small amount of electric charge remains in the removed electric dust collecting element 3, it is possible to surely discharge the electric dust collecting element 3, so that the electric dust collecting element 3 that has been removed does not receive an electric shock and is safer. is there.

The present invention is not limited to the above-described embodiments, and various design changes may be made within a range not changing the gist of the present invention, for example, applying the present invention to a general air purifier. You can

<Effects of the Invention> As described above, according to the present invention, when the frame is taken out from the housing, the discharge switch is interlocked with the electrically conductive housing and the power supply terminal for the anode to short-circuit. By this, the residual charges of all the electrostatic precipitating elements attached to the frame can be discharged to the housing via the respective anode power source terminals connected in parallel to each other, and thus in this extraction state. When an optional electrostatic precipitator element is removed from the frame, the connection with the removed electrostatic precipitator is released and the anode power supply terminal that is exposed is still attached to the frame. It is safe because no voltage is applied from other electrostatic precipitator elements, and the power supply terminals for each anode connected in parallel via the branch point are the same. Since the discharge switch can be short-circuited to the housing, it is not necessary to provide a discharge switch for each electrostatic precipitator element, which reduces the number of parts, which simplifies the mechanical structure and reduces product cost. Also has the unique effect of contributing.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an air cleaner including an electric shock preventive device according to an embodiment of the present invention, and FIGS. 2 and 3 are schematic front views showing a state where a frame is housed and a state where it is taken out, respectively. Fig. 4 is an exploded perspective view showing the element stopper, and Figs. 5 and 6 are vertical sectional views and bottom views showing the state in which the frame stopper holds the frame at an upper position, respectively. 8 and FIG. 8 are a longitudinal sectional view and a bottom view, respectively, showing a state where the frame stopper allows the frame to be taken out, FIG. 9 is a perspective view showing the discharge switch and the insulator, and FIG. 10 is a discharge switch. Fig. 11 is an exploded perspective view, Fig. 11 and Fig. 12 are schematic diagrams showing the operation of the discharge switch, Fig. 13 is a schematic wiring diagram of the air cleaner, and Fig. 14 shows an air conditioning system in which the air cleaner is arranged. It is a schematic diagram. 1 ... Housing, 2 ... Frame, 3 ... Electrostatic collection element, 4 ... Discharge switch, 13 ... Anode power supply terminal, 32a ... Anode, A ... Air purifier.

Claims (1)

[Claims] 1. A plurality of electrostatic precipitating elements (3), a high voltage supply source (16) for applying a high voltage to the anode (32a) of each electrostatic precipitating element (3), each electrostatic precipitating element ( 3) is provided in the frame body (2) capable of individually and detachably storing the frame body (2), and is connected to the high voltage supply source (16) in parallel via the branch point (a). In addition, a plurality of anode power source terminals (13) that are exposed when the electrostatic precipitator element (3) is removed from the frame body (2), and a conductive material that removably accommodates the frame body (2) inside In an electric shock preventive device to be mounted on an air purifier (A) having a flexible housing (1), the branch point is provided on the frame body (2) and interlocked with a take-out operation of the frame body (2). On the higher voltage supply source (16) side than (a), the anode power source terminal (13) of the frame (2) and the housing An electric shock preventive device comprising a discharge switch (4) for short-circuiting the ging (1).