JPS5822345B2 - Filter Noseizouhouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a filter in which a flexible furnace material is stretched over a synthetic resin frame.

Traditionally, many of the filters used for outside air intakes of vacuum cleaners, air conditioners, wind fans, etc. are made by combining flexible furnace materials such as synthetic resin nets, woven fabrics, and paper with molds. A mold cavity for forming the frame body and reinforcing ribs is provided in advance in the mold, and the cavity is filled and molded with synthetic resin to form the synthetic resin frame body and reinforcing ribs. These were welded to the furnace material at the same time as the molding.

As a result, the reinforcing ribs were completely welded to the furnace material, and the synthetic resin tended to penetrate into the mesh near the frame and the reinforcing ribs.

Therefore, the effective overflow area of the furnace material becomes less than the design value, and the amount of air passing through the furnace decreases, causing a temperature rise inside the machine, which may become dangerous.

In order to deal with this problem and reduce the overflow area, the filter must necessarily be made larger, which has the disadvantage that equipment such as vacuum cleaners and wind fans must also be made larger.

The present invention eliminates the above-mentioned drawbacks and provides a method for manufacturing a filter in which the effective overflow area is increased by partially connecting the reinforcing ribs and the furnace material.

FIG. 1 is a plan view showing an example of a vacuum cleaner filter manufactured by the method of the present invention, in which 1 is an annular outer frame, 4 is an annular inner frame, and 2 is an outer frame 1 and an inner frame 4. The connecting frame 3 is located between the outer frame 1 and the inner frame 4, and is an annular reinforcing rib that is connected to these by the connecting frame 2, which are all made of the same synthetic resin and integrated. It is shaped like this.

5 is a furnace material.

A part 3' of the reinforcing rib 3 is not welded to the furnace material and its connection is excluded, and the other parts and the frame body, that is, the outer frame 1,
The inner frame 4 and the connecting frame 2 are all welded together with the furnace material 5.

FIG. 2 is an explanatory diagram showing a method for manufacturing the filter of FIG. 1, and is shown as a portion corresponding to the AA cross section of FIG. 1.

6 is an upper mold, 7 is a lower mold, and 12 and 13 are joint surfaces of the upper mold and the lower mold, respectively.

5 is a furnace material inserted between the joining surfaces 12 and 13.

9 is a mold cavity for forming the outer frame 1, 10 is a mold cavity for forming the reinforcing rib 3, and 11 is a mold cavity for forming the connecting frame 2. It is a provision.

Reference numeral 8 denotes a non-adhesive thin plate, which is inserted between the furnace material 5 and the surface of the mold for forming reinforcing ribs facing the cavity 10 before filling with synthetic resin.

As the non-adhesive thin plate 8, a metal foil such as aluminum or a thin plate of heat-resistant synthetic resin such as tetrafluoroethylene is used.

If a slightly sticky thin plate is used instead of these non-adhesive thin plates, it is necessary to apply a release agent such as silicone oil to its surface.

Next, after the joint surfaces 12 and 13 of the upper mold 6 and the lower mold 7 are closed, synthetic resin is injection molded into the voids 9, 10, 11, etc., and the outer frame 1 constituting the frame body is , the inner frame 4, the connecting frame 2, the reinforcing ribs 3, and the furnace material 5 are integrally molded.

After that, when the thin plate 8 is pulled out, the portion 3' of the reinforcing rib that was in contact with the back thin plate 8 is not welded to the furnace material, and the other portions and the frame are welded together with the furnace material.

FIG. 3 is a plan view showing an example of a filter for a wind fan, and FIG. 4 is an explanatory diagram showing a method for manufacturing the filter shown in FIG. 3. shows the part.

14 is a frame body, and 15 and 16 are reinforcing ribs.

Portions 15 that are not welded to the sawn material 5 at each reinforcing rib location
', 16'.

The sill material 5 is integrally welded to the frame body 14 and the inner frame 4 (the part where the reinforcing ribs intersect).

To manufacture the filter shown in FIG. 3, as shown in FIG. 4, a non-adhesive thin plate 8...・・・・・・
..., and after injection molding synthetic resin, remove the non-adhesive thin plate 8, the frame 14 and reinforcing ribs 15, 16 are integrally molded, and the sill material 5 is formed by molding the frame 14 and the inner frame 4. The reinforcing ribs 15 and 16 are not welded together.

In order to create a non-welded part with the furnace material on both sides by providing reinforcing ribs on both sides of the thin plate, a gap is also provided in the lower mold, and the thin plate is inserted between the furnace material and the lower mold. This is possible by inserting it at the required location.

In the filter manufactured by the method of the present invention, reinforcing ribs are only welded to the surface of the slat material at appropriate intervals or locally.

Therefore, for example, when used as a primary filter for a vacuum cleaner, if the furnace material is placed on the air outlet side and the reinforcing ribs are on the inlet side, the furnace material will be sucked in and released from the reinforcing ribs, and the reinforcing ribs will Filtration is also performed effectively in this area, increasing the filtration surface and improving filtration efficiency.

Furthermore, as a result of the increased air volume, it is possible to prevent a rise in temperature due to internal heat generation of the motor, etc.

In addition, when used as a filter for air conditioners, wind fans, etc., the air volume increases as well, and in order to obtain a certain standard air volume, the total area of the filter can be reduced compared to conventional ones, and therefore the equipment can be made smaller. It also has the effect of reducing costs by reducing the amount of equipment and equipment used.

[Brief explanation of the drawing]

1 and 3 are plan views of filters manufactured by the method of the present invention, and FIGS. 2 and 4 are illustrations showing the state in which the filters of FIGS. 1 and 3 are manufactured by the method of the present invention, respectively. It is a diagram. 1...Outer frame, 2...Connection frame, 3...
...Reinforcement rib, 4...Inner frame, 5...
Sawa material, 8... thin plate, 6... upper mold, 7
...Lower mold, 12, 13...Joint surface,
9゜10.11,17... Mold cavity, 14.
...Frame body, 15.16...Reinforcement rib.

Claims (1)

[Claims] 1. In a method for manufacturing a filter in which a flexible furnace material is integrally stretched over a synthetic resin frame, the furnace material is inserted into a split mold, and a metal part of the furnace material for forming reinforcing ribs is inserted into a split mold. A thin plate for forming a non-welded part is placed on the surface facing the mold cavity at an appropriate interval, a mold release agent is applied to the surface of the thin plate as necessary, and the split mold is removed. After closing the mold and filling and molding a synthetic resin into the mold cavity for forming the frame body and the reinforcing rib, the thin plate is removed and a furnace material is placed in the corresponding part of the reinforcing rib where the thin plate is placed. A method for manufacturing a filter, characterized by forming a portion that is not welded with.