JPS58214182A - Electric field curtain sheet - Google Patents

Abstract

PURPOSE:To improve the powder transport capacity without deteriorating the pressure tight capability, by using an electric field curtain sheet which has a single phase exposed over the surface of the sheet main body among plural electrodes. CONSTITUTION:An insulated reinforcement layer 11 which is unified with an inner dielectric layer 2 and a surface dielectric layer 7 by means of vulcanization, etc. is provided at a cross part of electrodes of an electric field curtain sheet main body 1 having an exposed phase of an electrode 9 and between the layers 2 and 7. As a result, the electrode cross part has no dielectric breakdown even though buried electrodes 3 and 4 are set close to the surface electrode 9. This improves the pressure resistance of the main body 1. In addition, the powder transport capacity is improved since the electrodes 3, 4 and 9 are set close to each other in the thickness direction. Thus an electric field curtain sheet can be easily produced with a low cost since the layer 11 is formed easily by vulcanization, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention qI4 relates to an improvement of an electric field curtain sheet in which one phase of a plurality of electrodes is exposed on the surface of a sheet body.

This is a conventional electric field curtain sheet in which one phase of multiple electrodes is exposed on the surface of the sheet body.

For example, the one shown in FIG. 1 is known. The electric field curtain sheet has electrodes for two phases buried in the insulating support layer a with a gap between them, and the surface is covered with an internal dielectric layer d, and the surface of the internal n-electric layer d is covered with an acrylic material. A surface dielectric layer f is provided via an adhesive layer, and an rc11# output pole l is provided on this surface dielectric layer f. However, in the electric field curtain sheet with this structure, the internal S electric layer d is due to the adhesive layer e.
When the distance between layer f and surface r[@ layer f becomes large and it is conveniently used for transporting powder, the transport capacity decreases. Therefore, if the buried electrodes S and C are provided between the internal dielectric layer d and the adhesive layer e, the distance between each electrode b*'eji will become shorter and the powder transport force will increase, but the adhesive layer Since the gap between the holes A and C is not sufficiently filled, dielectric breakdown occurs at low voltage, resulting in a lack of withstand voltage.

In addition, in order to improve the voltage resistance, a method of providing an insulating layer between the internal dielectric layer d and the surface dielectric layer f as shown in FIG.
A gap t is likely to occur between f. This space @i is used as an electrode as shown in FIG.

C9! Because it occurs long in the direction perpendicular to
When a voltage is applied between the electrodes and the electrodes as shown in Fig. 4, a spark discharge occurs between the electrodes and c through the gap i, and the insulation of the innermost layer d in the gap area is broken. There were 0 tools.

The present invention was made to solve this problem, and aims to provide a 7 t% curtain sheet with a simple structure by increasing the powder transportation capacity without impairing the pressure resistance.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings shown in FIG.
Embedded electrodes 3 and 4 for each phase are provided in parallel with a space between them. The end of each buried 'a pole 3, 4 is a common line 3α,
4α, and each common line 3α
.

4α are respectively connected to terminals 5 and 6 provided so as to be exposed on one end side of the sheet body I. Further, on the upper surface of the insulating support layer 2, there are internal electrodes 3+4 embedded therein.
'm pigeon 7 is provided and this internal RtL layer 7
On top is a surface dielectric layer 8.

Then, an exposed electrode 9 is formed on the surface dielectric layer 8 by means such as etching. The exposed electrode 9 is provided so as to be parallel to the other buried electrode 3.4, and is connected at one end by a common line 9α.
α is connected to a terminal 10 installed adjacent to the terminals 5 and 6.

On the other hand, at the intersection between the buried IT electrodes 3 and 4 and the exposed electrode 9, an insulating reinforcing layer 11 made of silicone rubber is interposed between the internal dielectric layer 7 and the surface -θ layer 8. The insulation reinforcing layer 11 is made of an unvulcanized silicone rubber sheet with a thickness of about 500 μm. , which is interposed between the layers 7 and 8, and is vulcanized under pressure and heat to be integrated with the respective spindle widths 7 and 8.

By vulcanization, insulation reinforcement /I11 as shown in FIG. 7 is formed without creating a gap between each dielectric J@7.8, and each electrode 3
, 4.9, the pressure resistance is further improved.

・6 electric field curtain sheets configured as above 4
k 3 t a s 9=- is connected to the converter l 2.13°1 via each terminal 5, 6.10 as shown in FIG.
Three-phase alternating currents U, V, and W are applied from 4, respectively, and the exposed electrode 9Fi is grounded for safety.
7C 3-phase AC supply section, that is, each terminal 5, 6.10
The lead wires (not shown) for supplying power are soldered and then covered with insulating rubber.

Note that concentration of the electric field can be prevented by bending each corner of the lines 3a, da, and 9a, which connect each electrode 3, 4.9 and the terminal 5, 6.10, into an arc shape as shown in Fig. ε. Therefore, the pressure resistance of this portion can also be improved. In addition, although the above embodiment describes a three-phase case, it can also be applied to a single-phase or four-phase or more electric field curtain sheet, and the sheet body 1 may of course be of a cylindrical shape or other shape to be placed in a sheet shape. It's good.

As described in detail above, this invention has one phase 1ilL pole 9 placed at the exposed electrode intersection part of the electric field curtain sheet body 1, the internal dielectric layer 2 and the surface dielectric layer 2, and the surface dielectric layer 7. ,
Since the insulating reinforcing layer 11 integrated with the valley lines 1 ratio j-2, 7 is interposed by means such as vulcanization, the buried electrodes 3, 4
Even if the electrodes 9 are provided close to the surface electrodes 9, the voltage resistance of the electric field curtain sheet body I can be further improved without causing dielectric breakdown at the intersections of the electrodes.
．． By making 4j9 closer to each other in the thickness direction, when used for transporting powder, etc., transportation heat is improved, and since 11 can be easily formed on the insulation reinforcing layer 11 by means such as vulcanization, manufacturing is easy and inexpensive. It is also a bow section to provide.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional electric field curtain sheet. Figure 2 is a sectional view of the insulator section, Figure 3 is a sectional view taken along the line m-m in Figure 2, Figure 4 is a sectional view taken along the A sectional view of an electric field curtain sheet according to an embodiment of the invention, FIG. 6 is a sectional view taken along line V+-■ in FIG.
The diagram is! Figure 45 is an enlarged plan view inside the circle, and Figure 9 is a circuit diagram of the three-phase AC source. 2 is an insulating support/L3.4 is a buried electrode, 7 is an internal dielectric layer 1
g is a surface dielectric layer, 9 is an exposed electrode, and 11 is an insulation reinforcing layer. Applicant Fuji Xerox Co., Ltd. Representative Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Fukushima

Claims (1)

[Claims] Embedded electrodes 3 and 4 are placed on the insulating support layer 2, and an internal dielectric layer 7 is deposited to cover them.A surface dielectric layer 6 is provided on the internal dielectric layer 7, and a surface dielectric layer 6 is provided on the surface dielectric layer 8. An exposed electrode 9 is provided in an exposed manner, and is located between each dielectric layer 7, 8 at the intersection of each of the electrodes 3, 4.9, and is integrated with the dielectric layer 7, 8 by means of vulcanization. An electric field curtain sheet provided with reinforced insulation reinforcement Nll.