JPH031042Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a laminated filter element in which a membrane material is welded to a laminated support.

[Conventional technology]

BACKGROUND OF THE INVENTION A laminated filter element is known in which a porous membrane of tetrafluoroethylene is welded to a support and laminated in order to perform fine filtration of cleaning liquid used in the manufacture of elements of electronic devices. For example, there is one disclosed in Utility Model Application Publication No. 59-20808, and FIG. 4 shows one example thereof. In FIG. 4, the support body 25 of each layer of the conventional laminated filter element has a boss portion 2 having a central through hole 26a.
An annular plate-shaped inner frame part 27 and a cover part 2 are provided on the side outer periphery of 6.
8. It has an outer frame part 29 and is molded from synthetic resin, and is laminated with its central through hole 26a communicating with each other, and the outer peripheral edge 30a of the annular member 30 made of a porous membrane such as tetrafluoroethylene is the outer part. At 29, an inner peripheral edge 30b is welded to the inner frame portion 27 to form a filter element. The material 30 is welded so as to cover both the upper and lower surfaces of the cover 28, and is attached to the support 2.
The upper part 28 of No. 5 has a mesh shape and communicates with the central through hole 26a.

[Problem that the invention attempts to solve]

The outer frame of the support in the conventional laminated filter element described above is extended from the upper part, which is quite thick because it requires mesh-like openings on the upper and lower surfaces and voids that serve as fluid passages. Since they had the same thickness, when a membrane material was layered on top and the bottom surface and heat welded, the thick outer frame had a large heat capacity, so the membrane material tended to overheat, while the outer frame tended to cool, resulting in uneven temperatures. Material melting damage or incomplete welding occurred, causing problems with the sealing properties of the fitter element.

[Means to solve the problem]

This invention is intended to solve the above-mentioned problems, and a supporting body having an annular plate-shaped overpart and an outer frame part provided on the outer periphery of the side surface of a boss part having a central through hole is laminated, and a membranous porous part is laminated. A laminated filter element in which the periphery of the outer frame is made into a thin wall part and material is welded to the top and bottom surfaces of this part in a laminated filter element in which the outer part is covered with a quality material and the periphery of the material is welded to the outer frame part. It is an element.

[Effect]

In the laminated filter element with the above structure, the peripheral edge of the outer frame of the support is a thin part, and the materials are overlapped and welded to the upper and lower surfaces of the outer frame, so that the thin part of the support and the materials on the upper and lower surfaces are compared. Even when heating from one side of the material, the thin wall part and the material on the other side reach a sufficient temperature to weld completely before the material on one side is overheated and melted. Since this creates a welded state, the sealing performance of the filter element is ensured.

〔Example〕

An embodiment of this invention will be explained with reference to figures. 1st
The figure shows a support for the laminated filter element of this invention. The support body 1 is molded from a synthetic resin such as polypropylene and has a boss portion 2 having a central through hole 2a.
An inner frame part 3, a cover part 4, and an outer frame part 5 are provided in this order, surrounding the boss part and extending laterally in an annular plate shape.
A mesh-like fluid passage is provided in the upper part and communicates with the central through hole 2a. The outer peripheral edge of the outer frame portion 5 is thin 5
A extends laterally and is provided in an annular shape. An annular member 6 made of a porous membrane of tetrafluoroethylene covers the upper and lower surfaces of the cover portion 4, and its outer peripheral edge 6a is welded to the thin wall portion 5a, and the inner peripheral edge 6b is welded to the inner frame portion 5. . A required number of such supports 1 are stacked as shown in FIG. 2 to form a laminated filter element 7.

The laminated filter element 7 is attached to a liquid outlet 9b of a casing 9, which is provided with a raw liquid inlet 9a and a liquid outlet 9b, by means of a vertically grooved center bolt 8 that is inserted through each central through hole 2a that is stacked and communicates with each other.

Support body 1 of the above laminated filter element 7
To weld the material 6 to the material 6, as shown in FIG. If the parts 5a are overlapped and the heating element 21a of the impulse heater device 21 is pressed and heated from above, the outer peripheral edge 6a of the upper material and the thin part 5a of the support are welded, and at the same time the heat is transferred to the lower surface of the thin part 5a. The outer peripheral edge 6a of the material further below is reached and these are welded.

Further, in the above embodiment, the inner peripheral edge 6b of the material 6 is welded to the inner frame 3 of the support 1, but in this case, the material covering the upper part of the adjacent support,
The inner peripheral edges 6b of the materials may be welded in a bellows shape, and end plates may be provided at the upper and lower ends of the support in the top and bottom layers, and the inner peripheral edges 6b of the materials may be welded to these end plates. In this case, the inner frame portion 3 of the support body can be omitted.

〔effect〕

As mentioned above, the laminated filter element of this invention can completely weld the material and the support by thinning the outer frame of the support to which the material is welded, so the laminated filter element ensures sealing performance. It is.

[Brief explanation of the drawing]

Fig. 1 shows a support of this invention, Fig. 2 shows an embodiment of this invention, Fig. 3 shows a method of welding materials, and Fig. 4 shows a conventional support. DESCRIPTION OF SYMBOLS 1... Support body, 5... Outer frame part, 5a... Thin wall part, 7... Laminated filter element.

Claims (1)

[Scope of utility model registration request] A synthetic resin support body having a boss portion having a central through hole, an annular plate-shaped cover portion and an outer frame portion on the outer periphery of the side surface of the boss portion is laminated, and the cover portion is covered with a porous film-like synthetic resin material. A laminated filter element comprising: an annular thin-walled portion formed on the outer peripheral edge of the outer frame portion; and a peripheral edge of the material welded to the thin-walled portion.