JPH044816Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a laminated type precision filter, mainly a precision filter for purifying various chemical solutions, pure water, etc.

(Prior art) Filters for treating chemical liquids and gases used in the production of various pharmaceuticals and electronic components, as well as pure water used in the food industry, have chemical resistance and heat resistance, and are of submicron order. It is desired to have excessive precision, and to meet this demand, a laminated type filter made of synthetic resin as shown in FIG. 3 is currently widely used.

That is, the entire body is made of a synthetic resin having chemical and heat resistance such as tetrafluoroethylene, polypropylene, or nylon, and has a plurality of radial grooves in the thick central part of the porous circular desk part 1a and the central boss part 1b. 1d, and a porous annular thin film 1c is provided on the upper and lower surfaces of the circular desk part 1a, and the inner and outer peripheral edges of the film are welded to the inner and outer peripheral parts of the desk part 1a to form a desk element 1. A required number of elements 1 are stacked and the boss portions 1b are welded together to integrate them, and this is inserted into a center pipe 2 which has a large number of horizontal small holes 2a that correspond to the radial grooves 1d of each element 1 and whose lower end is closed. Also,
The upper end of the center pipe 2 is screwed onto the center outlet pipe 4a of the dish-shaped cover 4, and while the laminated element 1 is housed inside the pot-shaped container 3, the cover 4 is placed over the upper end of the container 3, and the peripheral edge thereof is is welded to the container 3, and the inlet pipe 3a at the lower end of the container
The processing fluid flows in from the radial groove 1d in each element 1 and passes through the thin films 1c above and below each element 1 for purification.
The waste is collected in the tank and sent to a required location through an outlet pipe 4a.

(Problem to be solved by the invention) By the way, in the above-mentioned conventional filter, since it is necessary to reduce the velocity of the processing fluid in the container, a considerable space is provided between the bottom of the container and the laminated element inside the cover. Therefore, if back pressure is applied to the element for some reason (such as when the pump stops supplying purification liquid to a place higher than the set position of the filter, or when the treatment liquid flows backwards due to incorrect operation), The middle thin films interfere with each other and do not expand as much as shown on the left, but those at the upper and lower ends expand outward greatly as shown by the dotted lines in the figure and eventually break.

Therefore, this invention provides a precision filter in which the thin film will not be damaged even if reverse pressure is applied to the laminated element.

(Means for Solving the Problems) Based on the above-mentioned purpose, this invention is made entirely of synthetic resin, and a porous thin film is stretched on the upper and lower surfaces of the porous desk part, and the desk part and the boss part are A laminated element is formed by laminating and integrating a large number of desk elements each having a plurality of radial grooves, the laminated element is housed in a container having an inlet pipe at the lower end, a cover is attached to the upper end, and the upper end of the laminated element is covered. In a precision filter that is connected to the outlet pipe at the center of the container, a required number of ribs are provided on the inner surface of the bottom of the container with the upper end surface close to the lowest desk element, and the inner surface of the cover is also provided with the lower end surface closer to the uppermost desk element. It is characterized by providing the required number of ribs close to the desk element.

(Function) When the processing fluid flows in from the inlet pipe at the lower end, the processing fluid passes through the thin film of each desk element and is purified, and the purified fluid is guided to the radial groove of each element and collected at the boss part, It is sent to the required location through the outlet pipe of the cover.

When back pressure is applied to the laminated desk elements during use, the thin film of the bottom or top element tends to bulge outward, but this is prevented by the ribs on the bottom of the container or inside the cover. be done.

(Embodiment) FIG. 1 shows an embodiment of this invention, in which the entire desk element 11 is made of a synthetic resin having chemical resistance and heat resistance such as tetrafluoroethylene, polypropylene, or nylon, and the desk element 11 is made of a porous material. Consisting of a circular desk part 11a and a central boss part 11b, a plurality of radial grooves 11d are provided in the central part of the wall thickness, and a porous annular thin film 1 is provided on the upper and lower surfaces of the desk part 11a.
1c is arranged, and its inner and outer peripheral parts are the desk part 1.
A required number of such desk elements 11 are stacked and the boss portions 11b are welded together to form a horizontal small hole that corresponds to the radial groove 11d of each element 11. 12a, the center pipe 12 is inserted into a center pipe 12 whose lower end is closed.
The upper end is connected to the central outlet pipe 14a of the dish-shaped cover 14, which has an assembly gas vent 14b on one side, and the laminated element is housed in a pot-shaped container 13 with an inlet pipe 13a at the lower end. The structure in which a cover 14 is applied to the open end of the container 13 and the peripheral edge of the cover 14 is welded to the container 13 is the same as the conventional one.

By the way, in this invention, on the inner surface of the bottom of the container 13, as shown in FIG. In addition, as shown in FIG. There is.

In its use, the processing fluid flows into the container 13 from the inlet pipe 13a at the lower end as usual, and the processing fluid passes through the thin membrane 11c of each desk element 11 to be purified. It is guided by the radial groove 11d of the element 11, collected in the center pipe 12, and supplied to the required location via the outlet pipe 14a. However, if back pressure acts on the laminated element for some reason during its use, the bottom stage and top desk element 11
The thin film 11c on the bottom or top of the container tries to expand into the space inside the bottom of the container or the cover, but the radial ribs 1 provided on all sides in those spaces
5 and 16, the thin film 11c is received and prevented from expanding excessively.

In the illustrated example, radial ribs 15 and 16 are provided on both sides of the container 11 and the cover 14, but these can effectively prevent the expansion of the thin film 11c without hindering the slowing down of the processing fluid. It may be increased or decreased as appropriate within the range. Also, rib 1
5 and 16 may be lattice-like instead of radial.

(Effects of the invention) As described above, in this invention, in order to purify various chemical solutions and pure water, a laminated desk-type precision filter using a porous thin film is installed in the bottom space of the container and the internal space of the cover. The required number of ribs were placed close to the bottom or top desk, so
Even if a reverse pressure is applied to the laminated desk element during use, outward expansion of the thin film at the bottom or top layer is effectively prevented, and the device can withstand long-term use without fear of breakage.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of this invention. Figure 2A is a perspective view of the cover turned over. Figure B is a cross-sectional plan view of the bottom of the container. Figure 3 is a cross-sectional view of the conventional product. In the figure, 11... desk element, 11a...
desk part, 11b...boss part, 11c...thin film,
11d... Radiation groove, 12... Center pipe,
12a...Horizontal hole, 13...Container, 13a...Inlet pipe, 14...Cover, 14a...Outlet pipe, 15, 16...Rib.

Claims (1)

[Scope of utility model registration request] The desk part 11 is entirely made of synthetic resin and is porous.
A laminated element is formed by laminating and integrating a large number of desk elements 11 in which a porous thin film 11c is stretched on the upper and lower surfaces of the disk part 11a and a plurality of radial grooves 11d are provided between the desk part 11a and the boss part 11b. The laminated element is housed in a container 13 having an inlet pipe 13a at the lower end, and a cover 14 is attached to the upper end.
In the precision filter, a required number of ribs 15 are provided on the inner surface of the bottom of the container 13 with the upper end surface close to the desk element 11 at the lowest stage, and a rib 15 is provided on the inner surface of the cover 14 at the bottom. This precision filter is provided with a required number of ribs 16 whose end faces are close to the top desk element 11.