JPH09173259A - Electromagnetic wave shielding hose and cleaner provided with the hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent influences given to electronic instruments and communication installations from occurring by shielding electromagnetic wave generated by discharging of static electricity charged on a hose main body and dust in the hose when the dust, etc., are sucked. SOLUTION: This electromagnetic wave shielding hose is provided with a suction hose 201 sucking dust, an earthed metal mesh 202 provided on the outer surface of this suction hose 201 and an insulating body 203 covering the outer surface of this metal mesh 202.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic shield hose for preventing emission of electromagnetic noise generated by discharge of static electricity charged in the hose body and the dust inside the hose when inhaling dust and the like, and a cleaner equipped with the hose. It is about.

[0002]

2. Description of the Related Art When a communication facility (device rack such as an exchange) is added, a fixing bolt is installed on a floor of a station building. In this case, a concrete vacuum cleaner is used to suck in concrete scraps and the like generated in the drilling work for making holes in the concrete floor. At this time,
Electromagnetic noise is generated due to the discharge of static electricity charged in the suction hose body of the vacuum cleaner and the hose dust. As shown in FIG. 6, this electromagnetic wave noise is radiated over a wide frequency band at a level exceeding the VCCI standard, and therefore adversely affects peripheral communication equipment. The two-dot chain line in the figure is the VCCI standard (electric field strength of radiated emission at a measurement distance of 3 m from the radiation source: 30 MHz to
50 dBμV / m at 230 MHz, 230 MHz to 1 G
57 dBμV / m) in Hz, and the dotted line in the figure is the allowable level set in consideration of a predetermined safety factor. It can be seen that noise that exceeds the VCCI standard is generated in both the vertical polarization VW and the horizontal polarization HW.

As a generation mechanism of electromagnetic noise,
It can be considered as follows. In other words, concrete dust and the like are fine and dry, and when inhaled, fine concrete dust and the like rub against it, so that static electricity is charged, and static electricity is discharged while moving in the suction hose. It is considered that electromagnetic noise is generated.

[0004]

Generally, since the suction hose of the vacuum cleaner is made of an insulating material and is not shielded against the generation of electromagnetic waves that affect electronic devices, electromagnetic waves generated inside the hose are not provided. The emission of noise could not be suppressed.

The present invention has been made in view of the above circumstances, and shields electromagnetic waves generated by the discharge of static electricity charged in the hose body and the dust inside the hose at the time of inhaling dust and the like, and is used for electronic equipment, communication equipment, etc. An object of the present invention is to provide an electromagnetic wave shield hose that prevents the influence thereof and a cleaner equipped with the hose.

[0006]

In order to achieve the above object, an electromagnetic wave shield hose of the present invention comprises a suction hose for sucking dust, an electromagnetic wave shield material provided on the outer surface of the suction hose and grounded, And an insulator coated on the outer surface of the electromagnetic wave shield material.

The electromagnetic wave shielding hose of the present invention is characterized in that the electromagnetic wave shielding material is a metal mesh. Further, the electromagnetic wave shield hose of the present invention is characterized in that the electromagnetic wave shield material is an aluminum foil or an aluminum vapor deposition sheet.

The electromagnetic wave shielding hose of the present invention is characterized in that the electromagnetic wave shielding material is a conductive cloth. The electromagnetic wave shield hose of the present invention is characterized in that a conductive paint is applied as the electromagnetic wave shield material. A vacuum cleaner provided with the electromagnetic wave shield hose of the present invention is characterized in that each of the electromagnetic wave shield hoses is provided in a suction device.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 shows Embodiment 1 of the present invention, (a) is a side view showing an example of a cleaner equipped with an electromagnetic wave shielding hose, (b) is a longitudinal sectional view showing an example of an electromagnetic wave shielding hose, and (c). [Fig. 3] is a cross-sectional view showing an example of an electromagnetic wave shield hose, and (d) is a front view showing an example of an outlet with a ground terminal. That is, as shown in FIG. 1A, the suction device 1 of the vacuum cleaner is provided with an electromagnetic wave shield hose 2 for sucking dust and the like, and the electromagnetic wave shield hose 2 is grounded. As shown in FIGS. 1B and 1C, the electromagnetic wave shield hose 2 is provided with a metal mesh 202, which is an electromagnetic wave shield material, on the outer surface of an intake hose 201 which is made of an insulating material and inhales dust or the like. The outer surface of the metal mesh 202 is covered with an insulator 2.
03 is coated. The metal mesh 202 is shown in FIG.
Power supply terminal 301 and ground terminal 30 as shown in FIG.
Earth terminal 302 of outlet with 2 earth terminals
Connected to.

That is, when the suction device 1 of the vacuum cleaner sucks dust such as concrete scraps generated by the drilling work for making a hole in the floor of the building, the suction hose 201 and the suction hose 2
01 Electromagnetic noise is generated by the discharge of static electricity charged in the dust inside, but electromagnetic noise is generated by grounding the metal mesh 202, which is an electromagnetic shielding material provided on the outer surface of the suction hose 201.
It is possible to prevent radiation to the outside.

FIG. 2 is a vertical sectional view showing an electromagnetic wave shield hose according to a second embodiment of the present invention. That is, the vinyl chloride films 205 and 2 are formed on the front surface and the back surface of the aluminum foil or the aluminum vapor deposition sheet 204, respectively.
The electromagnetic wave shielding material in which 06 is integrally laminated is provided on the outer surface of the suction hose 201 to form an electromagnetic wave shielding hose, and the aluminum foil or the aluminum vapor deposition sheet 204 is grounded. Even with this configuration, it is possible to prevent the emission of electromagnetic noise, as in the first embodiment.

FIG. 3 is a vertical sectional view showing an electromagnetic wave shield hose according to a third embodiment of the present invention. That is, a conductive cloth 207, which is an electromagnetic wave shielding material, is provided on the outer surface of the suction hose 201, and the insulator 2 is provided on the outer surface of the conductive cloth 207.
03 is coated to form an electromagnetic shield hose, and the conductive cloth 207 is grounded. Even with this configuration, it is possible to prevent the emission of electromagnetic noise, as in the first embodiment.

FIG. 4 is a vertical sectional view showing an electromagnetic wave shield hose according to a fourth embodiment of the present invention. That is, a conductive paint 208, which is an electromagnetic wave shield material, is applied to the outer surface of the suction hose 201, and an insulator 203 is coated on the outer surface of the conductive paint 208 to form an electromagnetic wave shield hose. Is grounded. Even with this configuration, it is possible to prevent the emission of electromagnetic noise, as in the first embodiment.

The electromagnetic wave shield material is grounded (earth)
In order to connect to, the electromagnetic wave shielding material and the ground may be directly connected, or the power supply line of the cleaner main body may be provided with an earth connecting line connected to the earth and the electromagnetic wave shielding material may be connected to this earth connecting line. .

When the suction hose made of an insulating material is covered with the electromagnetic wave shielding material, it is desirable to cover the electromagnetic wave shielding material with an insulator. That is, if the electromagnetic wave shield material is exposed, there is a risk that it may come into contact with a peripheral communication device and cause a short circuit.

Further, in the structure in which the conductive paint is applied, it is possible to shield the suction hose without deteriorating its flexibility. FIG. 5 shows measured values of electromagnetic noise in the case of the electromagnetic shield hose shown in the first embodiment. The two-dot chain line in the figure indicates the VCCI standard (measurement distance from the radiation source is 3
Electric field intensity of radiated interference wave at m: 30 MHz to 230
50 dBμV / m in MHz and 57 dBμV / m in 230 MHz to 1 GHz), and the dotted line in the figure is the allowable level set in consideration of a predetermined safety factor. As is clear from the measurement results, it is understood that electromagnetic noise can be suppressed over a wide frequency band for both the vertically polarized wave VW and the horizontally polarized wave HW.

Also in the comparison between the conventional structure and the present invention, as shown in FIGS. 5 and 6, the effect of suppressing the electromagnetic wave radiation by providing the electromagnetic wave shield is remarkable in the electromagnetic spectrum measurement.

Further, during concrete drilling work in the room where the communication device is installed, when a concrete dust is sucked in using a suction hose of a conventional vacuum cleaner, a code error occurs in the communication device. When the present invention was used, no code error occurred in the above work.

[0019]

As described above, according to the present invention, when inhaling dust or the like, electromagnetic waves generated by discharge of static electricity charged in the hose body and dust inside the hose are shielded,
It is possible to provide an electromagnetic wave shield hose that prevents an influence on electronic devices, communication equipment, and the like, and a cleaner including the hose.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional view showing an electromagnetic wave shield hose according to a second embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view showing an electromagnetic wave shield hose according to a third embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view showing an electromagnetic wave shield hose according to a fourth embodiment of the present invention.

FIG. 5 is an actual measurement value of electromagnetic noise in the case of the electromagnetic shield hose shown in the first embodiment of the present invention.

FIG. 6 shows measured values of electromagnetic noise in the case of a conventional electromagnetic shield hose.

[Explanation of symbols]

1 Vacuum cleaner suction device 2 Electromagnetic wave shield hose 201 Suction hose 202 Metal mesh 203 Insulator 204 Aluminum foil or aluminum vapor deposition sheet 205,206 Vinyl chloride film 207 Conductive cloth 208 Conductive paint 301 Power supply terminal 302 Ground terminal

Claims (6)

[Claims] 1. A suction hose for sucking dust, an electromagnetic wave shield material provided on the outer surface of the suction hose and grounded, and an insulator coated on the outer surface of the electromagnetic wave shield material. Electromagnetic wave shield hose. 2. The electromagnetic wave shield hose according to claim 1, wherein the electromagnetic wave shield material is a metal mesh. 3. The electromagnetic wave shield hose according to claim 1, wherein the electromagnetic wave shield material is an aluminum foil or an aluminum vapor deposition sheet. 4. The electromagnetic wave shield hose according to claim 1, wherein the electromagnetic wave shield material is a conductive cloth. 5. The electromagnetic shield hose according to claim 1, wherein a conductive paint is applied as the electromagnetic shield material. 6. A vacuum cleaner equipped with an electromagnetic wave shield hose, wherein the electromagnetic wave shield hose according to claim 1, 2, 3, 4, or 5 is provided in a suction device.