SU1717386A1 - Device for fastening union to vacuum bag - Google Patents

Abstract

The invention relates to a tooling for the manufacture of layered structures. The device includes a choke 1 with an axial bore 2, a truncated cone-shaped disk 3, in which, from the side of the larger base, a drainage system in the form of layers 4 of rigid cellular material communicating with the axial bore 2, covering the choke 1 and installed on the smaller disk base Sealing gaskets 5 to clamp the edges of the vacuum bag 6 between them, mounted under the pressure washer 7 and the pressure nut 8.: 1 sludge. to the pump 15 w I V | SA 00 O

Description

The invention relates to equipment for forming articles by means of vacuum bags and can be used in the manufacture of laminated shells.

A device for attaching a fitting to a vacuum bag is known, consisting of a fitting with an axial bore and a truncated cone-shaped flange, covering the fitting and sealing gaskets installed on a smaller flange base, between which a vacuum bag is clamped, installed under a pressure washer and nuts.

In this device, there is no drainage system in the flange of the nozzle on the side of the larger base, as a result of which, during the evacuation process, the drainage layer is drawn into the axial hole, and closes it, which reduces the degree of evacuation.

Closest to the invention is a device for fastening a choke to a vacuum bag, consisting of a choke with an axial bore and a frusto-conical disk, in which a drainage system is located on the side of the larger base, communicating with the axial bore, covering the choke and mounted on a smaller the base of the disc seals for clamping between the edges of the vacuum bag, installed under the pressure washer and pressure nut.

In this case, the drainage system is represented by radial grooves made in the disk from the side of the larger base, communicating with the central axial hole, closed by a thin plate glued to the flange, which is provided with rows of holes arranged along these grooves.

The known device does not provide a sufficiently high vacuuming efficiency, since it also causes, although to a lesser extent, the material of the drainage layer is drawn into the plate apertures, which leads to an increase in the aerodynamic resistance of the drainage system and a decrease in the vacuum level under the bag.

The aim of the invention is to increase the efficiency of the vacuum.

This goal is achieved by the fact that, in a device for attaching a fitting to a vacuum bag, consisting of a fitting with an axial bore and a disk in the shape of a truncated cone, in which a drainage system is located on the side of the larger base, communicating with the axial bore, covering the fitting and installed on a smaller disc base of gaskets for clamping the edges between them

vacuum bag, installed under the pressure washer and pressure nut, the drainage system is designed as a package of layers of rigid cellular material, mesh

or honeycombs stacked flush in a glass-shaped recess made in the disk from the side of its larger base with the displacement of the cells of each layer relative to the cells of the adjacent ones.

The drawing shows a diagram of the device.

The device comprises a fitting 1 with an axial bore 2, a disk 3 in the shape of a truncated cone, in which a drainage system in the form of layers 4 of rigid cellular material such as a mesh or honeycomb is made on the side of a larger base. communicating with the axial bore 2, covering the nipple 1 and sealing gaskets 5 installed on a smaller disc 3 base for clamping the edges of the vacuum bag 6 between them. Installed under the pressure washer 7 and the pressure nut 8.

Layers 4 hard cellular material

placed in a cup-shaped notch 9, which is made in the disk 3 from the side of its larger base, flush with the plane of this base, while the cells 10 of each layer 4 are displaced relative to the neighboring cells.

The device works as follows.

The product 11 is laid out on the mandrel 12, a perforated separation layer 13 is applied. On which the drainage layer 14 is placed.

In the vacuum bag b, a hole is cut with a diameter equal to the diameter of the choke .1.8 the cut hole on the other side of the vacuum bag 6 which is adjacent to

The drainage layer 14 is inserted into a fitting 1 with a disk 3, in which the drainage system 4 is placed in a glass-like recess 9 in the form of a package of layers 4 of cellular material, for example, a impregnated binder and a pre-cured fiberglass mesh, and a gasket 5 is installed on a smaller base Then on the fitting 1 put on the second gasket 5, the pressure washer 7 and screw-on,

the pressure nut 8 is pulled. When the pressure nut 8 is tightened, compression seals 5 are compressed. The edges of the vacuum bag 6 are clamped between them, thus providing a tight connection

fitting 1 with a vacuum bag 6. which is placed on the layer 14. The fitting 1 is connected by a vacuum hose 15 to a vacuum pump. When the vacuum system is turned on, suction occurs from under the vacuum bag.

(air and during the curing process of the product 11 molded on the mandrel 12; suction of the gaseous products of the curing reaction. Air from under the vacuum bag 6 and from the product 2 passes through the drainage layer 14 installed under the bag 6, the drainage system enters the axial bore 2 of fitting 1 and through the vacuum hose 15 to the vacuum system. At the same time, the suction of the material of the drainage layer 14 into the cells 10 does not occur, and the gaseous products freely, without experiencing great aerodynamic resistance, pass through the drainage system to the axial orifice The nozzles 1 and 1 are effectively removed.

The measured vacuum level under the bag when using the device was -0.96 kgf / cm2, which is more than in the known solution.20

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Claims (1)

Apparatus of the Invention A device for fastening a choke to a vacuum bag, consisting of a choke with an axial bore and a frusto-conical disk, in which a drainage system is located on the side of the larger base, which communicates with the axial bore, covering the choke and installed on the smaller disk base of the gasket for clamping between them the edges of the vacuum bag installed under the pressure washer and the pressure nut, characterized in that. that, in order to increase the efficiency of vacuum. The drainage system is made in the form of a package of layers of rigid cellular material such as a mesh or honeycombs, which are laid flush in a cup-shaped recess made in the disk from the side of its larger base with the cells of each layer displaced relative to the cells of the adjacent ones.