JPH0416575Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a penetration airtight device for electrical wiring for clean rooms.

(Prior Art) As shown in FIGS. 1 and 2, a conventional device of this type is provided with a hollow support member b on the ceiling of a room that supports an air filter a on its upper surface.
Through-holes c, c are provided in the upper and lower opposing walls of the , a cord-type electrical wiring d is passed through the through-holes c, c, and a curable sealing material e is provided between the through-hole electrical wiring d and the through-holes c, c. , e, and electrically connect the lead-out end of the through-hole electrical wiring d to equipment f, such as a certification device or a gas detector, which is fixed on the lower surface of the hollow support member b or at an appropriate location in the room. A penetrating airtight device for clean room electrical wiring is known.

(Problems to be Solved by the Invention) In the above-mentioned conventional airtight device for electrical wiring for clean rooms, the electrical wiring d is flexible and the hollow support member b through which it is penetrated is hollow, so that the seal cannot be sealed. Electrical wiring tends to move easily during work, and the sealing material applied around its outer periphery tends to flow outward, making the seal unstable.Even after sealing, electrical wiring is easy to move due to shocks such as vibrations and earthquakes, This has the disadvantage that the solidified sealing material tends to crack and lose its sealing properties, and there is an extremely high risk that contaminated air will leak into the room through the cracks and contaminate the room.

(Means for Solving the Problems) The present invention solves the above-mentioned disadvantages of the conventional electrical wiring penetration airtight devices and provides a penetration airtight device for clean room electrical wiring that improves the airtightness of the through hole portion. Then, the electrical wiring is inserted into the hollow support member for supporting the air filter through the through hole provided in the opposite wall of the member, and the space between the inserted electrical wiring and the through hole is sealed with a sealing material. In a type of airtight device, a cylindrical member is provided that extends through the two through holes, an electric wire is inserted into the hollow hole of the cylindrical member, and the outer periphery of the insertion portion is connected to the inner peripheral surface of the cylindrical member. The cylindrical member is held immovably directly or through a curable sealant filled in the hollow hole, and a gelling sealant is applied in the recess provided at one end of the cylindrical member, and the electrical wiring in the center of the cylindrical member is fixed. Form the outer periphery airtightly,
Furthermore, the space between the through-holes at both ends of the cylindrical member and the through-holes of the hollow support member is airtightly sealed with a hardening seal.

(Function) Since the insertion portion of the electrical wiring penetrating the hollow support member is held immovably within the cylindrical member, the sealing operation of the electrical wiring at one end of the cylindrical member can be performed stably and well. Since the gelling sealing material applied to the outer periphery of the electrical wiring becomes a semi-solid state and is applied within the recess, a good seal can be ensured that covers the central electrical wiring from the outer periphery.

Further, by filling the hollow hole of the cylindrical member with the curable sealing material, even better sealing can be obtained along the length of the electrical wiring in the length direction of the cylindrical member. Furthermore, since the electrical wiring is immovably held within the cylindrical member, the seal between both through holes of the hollow support member and both ends of the cylindrical member passing through the through holes is simply passed through the hollow support member. Unlike conventional electrical wiring, it does not sway, so it can be easily and stably removed by packing or using a sealing material such as a hardening sealant.

(Example) Next, an example of the present invention will be described with reference to FIGS. 3 to 6.

FIG. 3 shows one example of implementation of the invention. In the drawings, reference numeral 1 denotes a square hollow support member made of steel, light metal, synthetic resin, etc., which supports an air filter (not shown) on its upper surface. These hollow support members 1, 1... are assembled in a grid pattern vertically and horizontally on the ceiling of the room, and each grid hole 2 is surrounded so as to close the upper surface of a large number of square grid holes 2, 2... surrounded by these hollow support members 1, 1... An air filter is placed on the peripheral edge of the upper surface of the hollow support members 1, 1, . . . In order to connect electrical wiring to an electric appliance installed below this air purifying device, as shown in the figure, electrical wiring is connected to the hollow supporting member 1 at a predetermined location on the upper surface and the opposite wall on the lower surface of the hollow supporting member 1. Through holes 3, 3 for insertion are provided.
The configuration up to this point is the same as the conventional configuration, but according to the present invention, the cylindrical member 4 extending through both the through holes 3 is fixed in an airtight manner. In the drawing, the cylindrical member 4 is shaped like a bolt with a hollow hole 5 in the center passing through both ends, and is inserted into the through holes 3 from above, with a bulging head on the outer periphery of the upper end. 4
A is pressed against the upper surface of the hollow support member 1 through the annular packing 6 and fixed by tightening a nut 7 provided on the thread 4b on the outer periphery of the insertion end. Furthermore,
A curable sealing material 8 is applied to the outer periphery of the nut 7 at the lower end of the cylindrical member 4 through which the cylindrical member 4 passes, thereby ensuring a seal between the cylindrical member 4 and the through hole 3. Furthermore, as shown,
In addition to the annular packing type 6 sealing material described above, a curable sealing material 8 may be applied to the outer periphery of the annular packing 6 to increase sealing performance. The electric wiring 9 is inserted into the hollow hole 5 of the cylindrical member 4 which is fixedly fixed through the hollow support member 1 in an airtight manner, and the lead-out end thereof is attached to the lower surface of the hollow support member 1 or inside the room. In this case, according to the present invention, the insertion portion 9 of the electrical wiring 9
a is held immovably within the cylindrical member 4, and in this state, as shown in the figure, at least the gelling sealant 11 applied to the recess 10 provided in the head 4a at the upper end of the cylindrical member 4 is applied. By sealing with a semi-solid gel, the electrical wiring penetration airtight device of the present invention is constructed.

The insertion portion 9a of the electrical wiring 9 may be either a cord type in which the electric wire is coated with a cylindrical insulating material such as synthetic resin or rubber, or a bare wire type in which the insulating coating is removed. Further, the means for holding the insertion part 9a immovably is to firmly hold the insertion part 9a directly on the inner circumferential surface of the cylindrical member 4, or to use a hardening sealant 8 injected into the inside of the cylindrical member 9. Either by hardened binding or by a combination of these.

In the immovable holding example shown in FIG.
In the case of insertion, the inner diameter of the cylindrical member 4 is achieved by using a member having a size suitable for the outer circumferential surface of the insertion portion 9a to be in sliding contact with the insertion portion 9a and to be pushed through the insertion portion 9a. In the embodiment shown in the fourth drawing, the insertion portion 9a of the electric wiring 9 is the same as that shown in the third drawing, but the inner diameter of the cylindrical member 4 is slightly larger than the diameter of the insertion portion 9a. In the cylindrical gap created between the inner periphery of the shaped member 4 and the insertion part 9a,
A case is shown in which the hardening sealant 8 is injected and the hardened sealant immovably binds the insertion portion 9a over substantially the entire length thereof. In the embodiments shown in FIGS. 5 and 6, the insertion portion 9a of the electric wiring 9 is a bare wire type. In the case shown in FIG. These members 9a,
This is an example in which a curable sealing material 8 is filled in the cylindrical gap between the two parts 4 and 4, and the sealing material 8 is bonded and fixed in the longitudinal direction by curing. In both cases of FIG. 5 and FIG. 6, the insertion portion 9a of the electric wiring 9 is made by removing the cylindrical covering material, so the diameter of the hollow hole 5 of the cylindrical member 4 can be reduced, and therefore Also, the cylindrical member 4
It is advantageous that the outer diameter of the hollow support member 1 can also be made small, and therefore the through holes 3, 3 provided in the hollow support member 1 can also be made small. or,
By using the gelling seal 11 as a sealing material in the recess 10 at one end of the cylindrical member 4, extremely good and stable sealing performance can be maintained over a long period of time.

(Effect of the invention) As described above, according to the invention, a cylindrical member extending through both through holes provided in the hollow support member is fixedly installed, an electric wiring is inserted into the hollow hole of the cylindrical member, Since the insertion portion is held immovable, the outer periphery of the electrical wiring can be sealed with a curable sealant in a stable state, and a gelling material is placed in the recess provided at one end of the cylindrical member. Since the sealing material is applied, the gelled semi-solid sealing material can form a good and stable seal around the outer periphery of the electrical wiring, and can also seal both ends of the immovably fixed cylindrical member and the through hole. The curable sealing material applied between the two has the effect that the seal between the two can be easily and favorably obtained.

[Brief explanation of the drawing]

Fig. 1 is a cut-away side view of a part of an air purifier equipped with a conventional electrical wiring penetration airtight device for clean rooms, Fig. 2 is an enlarged cutaway side view of the electrical wiring penetration airtightness device, and Figs. FIG. 6 shows a cut-away side view of an embodiment of the air-tight device for electrical wiring for a clean room in the air purifying device of the present invention. DESCRIPTION OF SYMBOLS 1... Hollow support member, 3... Through hole, 4... Cylindrical member, 5... Hollow hole, 6... Annular packing, 8
...Curable sealing material, 9...Electrical wiring, 11...
Gellable sealant.

Claims (1)

[Claims for Utility Model Registration] 1. Electrical wiring is inserted into a hollow support member for supporting an air filter through a through hole provided on the opposing wall of the member, and the electrical wiring inserted through the through hole is connected to the hollow support member for supporting the air filter. In an airtight device that uses a sealing material to seal the space between the two through holes, a cylindrical member is provided that extends through the two through holes, an electric wire is inserted into the hollow hole of the cylindrical member, and the outer periphery of the insertion portion is connected to the It is held immovably on the inner peripheral surface of the cylindrical member directly or via a curable sealant filled in the hollow hole, and a gelling sealant is placed in a recess provided at one end of the cylindrical member. A clean room electrical appliance in which the outer periphery of the electrical wiring at the center is formed airtight, and the spaces between the through-holes at both ends of the cylindrical member and the through-holes of the hollow support member are airtightly sealed with a hardening sealant. Wiring penetration airtight device. 2. The device according to claim 1, wherein the electrical wiring insertion part is a cord type in which the electric wire is covered with a cylindrical insulating material or a bare wire type in which the insulating coating is removed.