JPH0337700Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to improvements in filter elements used in filters for treating various chemical solutions, pure water, or gaseous bodies.

(Prior Art) Filter members for processing chemical liquids and gases used in the production of various pharmaceutical products and electronic device parts, as well as pure water used in the food industry, include:
There is a demand for chemical resistance and heat resistance as well as overaccuracy on the order of submicrons, and recently, filter members such as those shown in FIGS. 5A and 5B have been used to meet this requirement.

That is, a porous annular thin film 1a made of a synthetic resin with high chemical and heat resistance such as tetrafluoroethylene or polypropylene is provided with isolation netting 1b made of the same material and serving as reinforcement on both sides. On the other hand, a button-shaped spacer 2 is formed from the same resin material with a boss part 2a having a vertical hole and projecting upward and downward, and a horizontal part 2b having a plurality of horizontal through holes 2c communicating with the vertical hole, The upper and lower ends of the boss portion 2a are inserted into the center holes of the two materials 1, and the inner peripheral edges of each material 1 are welded to the upper and lower surfaces of the spacer horizontal portion 2b, and the outer peripheral edges of the materials 1 are welded together. Stack the required number of single elements as shown in FIG. Welded to the lower end of the pipe 4a, a blind cover 5 is applied to the lower end of the lowermost boss portion 2a, and the laminated element thus integrated with the cover 4 is inserted into a pot-shaped container 3 made of the same material, and The upper end surface of the container 3 and the lower end surface of the cover 4 are welded in a liquid-tight manner.

(Problem to be solved by the invention) By the way, in the conventional filter member described above, the center of each material is welded to the upper or lower surface of the horizontal part of each spacer, so when the elements are stacked, liquid In order to maintain tightness, the bosses of each spacer must be welded together, and the height of the bosses (approximately 5 to 6 mm) cannot be reduced to avoid damaging the center of the material during this welding process. , the number of elements housed in a container of a certain volume cannot be increased beyond a certain level.

Therefore, this idea does not weld the boss parts of the spacer together, but instead surrounds the abutting part of the boss part with a material to keep the inside of the spacer liquid-tight, and increases the number of laminated elements to improve the overarea. The purpose is to

(Means for solving the problem) Based on the above-mentioned purpose, this invention was developed by attaching a net material to the surface of a porous annular thin film made of synthetic resin as a filter element for precision filters. , a unit element is formed by stacking a pair of the materials one above the other and welding the outer peripheral parts, and interposing a spacer consisting of a boss part with a vertical hole and a horizontal part in the inner peripheral part, and the unit element. Stack the boss parts of the spacers vertically without welding them, overlap and weld the inner circumferential part of the lower material of the upper element and the inner circumferential part of the upper material of the lower element, and use the upper and lower materials to form each boss part. It is characterized in that a required number of elements are stacked so as to surround the abutting portion of the spacer, the vertical hole of the spacer at the bottom is closed, and the spacer at the top is fixed to the cover.

(Example) FIGS. 1 and 2 show an example of this invention. A porous annular thin film 11a made of polytetrafluoroethylene, polypropylene, etc., has chemical resistance and heat resistance.
A mesh material 11b made of the same material is attached to the surface of the material 11 to serve as isolation and reinforcement to prevent contact between membranes. A plurality of horizontal holes 12 leading to the vertical hole
A button-shaped spacer 12 is formed with the horizontal part 12b provided with a horizontal part 12b, and this spacer 12 is interposed in the center hole part of the pair of upper and lower materials 11, and the two materials 1
The point that the outer peripheral edge of one element is welded to form a unit element is the same as the conventional one.

By the way, in this invention, the center hole portion of the upper and lower materials 11 is
The unit elements are stacked one on top of the other without being welded to the horizontal portion 12b of the element, and the boss portions 12a of the spacers of each element are brought into contact with each other, but without welding, the center hole of the lower material 11 of the upper element is That is, the required number of elements are assembled as shown in FIG. 2 by overlapping the inner circumferential portion with the inner circumferential portion of the upper material 11 of the lower element and welding this to the upper surface of the spacer horizontal portion 12b of the lower element. (In Fig. 2, a slight gap is provided between the spacers to show that they are not welded together and are free.) In the uppermost element, the inner circumferential portion of the upper material 11 is stacked with the spacer 12. At the same time, the upper end of the spacer boss portion 12a is welded to the lower end of the take-out pipe 14a of the dish-shaped cover 14 made of the same material.
The inner circumferential portion of the spacer horizontal portion 12a is welded to the lower surface of the spacer horizontal portion 12a, and a blind lid 15 having a diameter larger than that of the spacer is liquid-tightly attached to the lower end of the boss portion 12a.

Thus, although the spacers 12 except for the upper and lower ends of the laminated element are not welded to each other, the abutting portions of the boss portions 12a are shielded from the outside surrounded by the upper and lower materials 11, so that they are not mutually bonded to each other. The vertical hole portion of each boss portion 12a is kept liquid-tight in the same manner as the welding to the cover 4.
are integrally connected to.

And a pot-shaped container 13 made of the same material.
A plurality of radiation plates 16 are provided on the bottom wall of the container 13 at a predetermined height from around the intake pipe 13a.
is received by the radiation plate 16 to hold the element in place, and the lower end surface of the cover 14 is welded to the upper end surface of the container 13.

In use, when the processing fluid is introduced from the intake pipe 13a at the bottom, it passes between the radiation plates 16 and rises in the container 13. In the rising process, it passes through the material 11 of each element from the periphery and is purified. It enters the interior, flows into the vertical hole of the boss portion 12a through the horizontal passage hole 12c of each spacer 12, rises in the vertical hole, and is sent to a required location from the take-out pipe 14a of the cover 14.

In this case, since the boss portions 12a of the spacer 12 do not need to be welded together, the height of the boss portions 12a may be just enough to prevent the upper and lower materials 11 from coming into contact with each other, and may be about half that of the conventional one.

Figures 3A and 3B show other embodiments,
In this case, the boss portion 1 of the button-shaped spacer 12
2a protrudes only above the horizontal portion 12b, and the boss portion 12a has a plurality of horizontal through holes 12c communicating with the vertical holes.
The horizontal part 12b is interposed between the central hole part, that is, the circumferential part, of the upper and lower pairs of materials 11 to form a unit element, and the unit elements are stacked one on top of the other, and the lower material 11 of the upper layer is stacked one on top of the other.
The inner periphery of the upper material 11 of the lower element is overlapped with the inner periphery of the upper material 11 of the lower element and welded to the upper surface of the horizontal part 12b of the lower element. 12 is welded and integrated with the outlet pipe of the cover 14, and the laminated element is housed in the container 13, and its function is the same as in the previous example.

Note that in the above example, the overlapped inner peripheral portion of the material 11 is welded to the upper surface of the horizontal portion 12b of the spacer 12, but in this way, the filter container can be connected to the discharge side of the pump. When the pump is stopped, the material 11
However, when using a filter container connected to the suction side of a pump, it is important to prevent back pressure from being applied to the material even when the pump is stopped. If consideration is given to this, it is not necessary to weld the overlapping inner peripheral portion of the material 11 to the upper surface of the horizontal portion of the spacer 12 as shown in FIG.

(Effects of the invention) As described above, according to this invention, the contact portion of the boss portion of each spacer is surrounded by a material to keep the inside of the spacer liquid-tight, so there is no need to weld the spacers together. Therefore, damage to the material can be prevented, and at the same time, the height of the boss portion of the spacer can be lowered, and the number of laminated elements can be increased accordingly, making it possible to significantly increase the excess area.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a unit element according to an embodiment of this invention. FIG. 2 is a sectional view showing the usage state of one embodiment. FIG. 3A is a sectional view showing another embodiment in use. Figure B is a perspective view of the spacer. FIG. 4 is a sectional view of a part of still another embodiment. FIG. 5A is a sectional view of a conventional unit element. Figure B is a sectional view showing the state in which the conventional element is used. In the figure, 11...material, 11a...thin film, 11b
... Net material, 12 ... Spacer, 12a ... Boss part, 12b ... Horizontal part, 12c ... Horizontal hole, 13
...Container, 13a...Intake pipe, 14...Cover, 14a...Takeout pipe, 15...Blind lid,
16... Radiation plate.

Claims (1)

[Scope of utility model registration request] A net material 11b is added to the surface of a porous annular thin film 11a made of synthetic resin to form a material 11, and a pair of materials 11 are stacked one on top of the other and the outer periphery is welded, and the inner periphery is vertically welded. Boss portion 12 with holes
A unit element is formed by interposing a spacer 12 consisting of a spacer 12a and a horizontal part 12b, and the unit elements are stacked one on top of the other without welding the boss part 12a of the spacer 12.
1 inner peripheral part and upper material 11 of the lower element
The inner peripheral parts of the above are overlapped and welded, and the upper and lower materials 11
The required number of elements are stacked by surrounding the abutting portion of each boss portion 12a, and the spacer 12 at the lowest stage is stacked.
An over-element for a precision filter that closes a vertical hole of the filter and fixes the uppermost spacer 12 to the cover 14.