JPH05137911A - Fluid filter - Google Patents

Abstract

PURPOSE:To obtain a fluid filter capable of easily preventing the retention of the permeated fluid by providing a bypass in the gap communicating with the permeated fluid side between the permeated fluid outlet pipe of the filter element and a filter element connecting hole and mounting a filter medium in the bypass. CONSTITUTION:The permeated fluid outlet pipe 13 of a filter element 1 is freely detachably inserted into the filter element connecting hole 223 through an O ring 5 and connected. As a result, a gap is formed between the outlet pipe 13 of the element 1 and the hole 223. Accordingly, a bypass 3 is provided between the outer surface of a boss 222 and the inner part of the hole 223, and a filter medium 4 is mounted at the inlet of the bypass 3. Since the filtered fluid flows through the inlet gap (a), a clean fluid is circulated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid filter used when fine particles in a fluid are removed by a permeable membrane.

[0002]

2. Description of the Related Art A cartridge filter may be used as a filter using a transparent film.

FIG. 3 shows a conventional cartridge filter, which is a permeated fluid outlet pipe portion 13 'of a filtration element 1'.
And a case lid 22 'having a permeate fluid outlet 221'.
O-ring 5'in the filter element connection hole 223 'of
5 ', and the case lid 22' is detachably coupled to the case body 21 'having the fluid inlet 211' to be processed by screwing or the like into the case body 21 '. The filter element 1'is housed, and the filter element is supported at the bottom of the case body via a spacer or the like.

As the above-mentioned filter element 1 ', one having a permeable membrane, a central port for collecting the permeable fluid having passed through the permeable membrane, and a permeable fluid outlet pipe portion is used. The fluid to be treated, which has been press-fitted into the case from the inlet 211 ', is filtered by the permeable membrane of the filtration element 1', the permeated fluid reaches the central port of the filtration element 1 ', and further, the filtration element It is discharged through the permeated fluid outlet pipe portion 13 'and the permeated fluid outlet 221' of the case lid 22 '.

[0005]

In the cartridge filter described above, a gap a is formed between the end surface of the permeate fluid outlet pipe of the filter element and the inner end of the filter lid connecting hole of the case lid. In addition, it is inevitable that a gap "a" remains between the outer peripheral surface of the permeated fluid outlet pipe portion and the inner peripheral surface of the filter element connecting hole.

However, in the former gap and the latter gap, the permeate fluid is unavoidably retained in the portion communicating with the permeate fluid side, and the following problems occur.

That is, in order to remove fine particles adhering to the secondary side of the filter, it is necessary to carry out permeation cleaning before using the filter. However, since permeated water is difficult to flow in the above-mentioned gap, It is difficult to wash and remove fine particles adhering to the gaps, and during use of the filter, the fine particles adhere to and accumulate in the gaps to become coarse,
The coarse particles may be desorbed due to fluctuations in the fluid pressure such as pulsation during use, and coarse particles may be generated in the permeated fluid. If it is not wetted by direct contact, it is necessary to pass a solvent such as ethanol to make the membrane surface compatible with the fluid to be treated, and then to filter the fluid to be treated. Solvents etc. that are accumulated will be extruded by the permeate fluid, but the solvent etc. accumulated in the above gap is difficult to flow the permeate fluid into the gap, so it cannot be extruded, even when filtering gas, use a filter It may be necessary to first replace the internal air with an inert gas such as N ₂ gas and then filter the gas to be treated. In this case, the replacement of the air in the gap with the inert gas is concentrated. The difference between the driving source Since that takes place by diffusion only, it takes a long time to replacement, there is a problem and the like.

An object of the present invention is a cartridge filter.
In the above, there is provided a fluid filter capable of easily preventing the permeated fluid from accumulating in a gap that is inevitably generated due to the structure in which the permeated fluid outlet pipe portion of the filtration element is inserted and connected to the filtration element connection hole through the packing. To do.

[0009]

In the fluid filter of the present invention, the permeated fluid outlet pipe portion of the filtration element is inserted into the perforated fluid connection hole of the housing for housing the filtration element through the packing to provide the permeated fluid. -Side filter and pre-permeate fluid side are blocked by the packing described above-
In the above, a bypass passage that opens the pre-permeation fluid side is provided in a gap existing between the permeation fluid outlet pipe portion of the filtration element and the filtration element connection hole, and that communicates with the permeation fluid side. The configuration is characterized in that a filter medium is attached.

[0010]

The particulate matter is removed from the bypass passage in the gap existing between the permeated fluid outlet pipe portion of the filtration element and the filtration element connecting hole and communicating with the permeated fluid side by the filter medium mounted in the bypass passage. Since the fluid thus circulated is circulated, it is possible to prevent the permeated fluid from staying in the gap.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a filtration element, which is provided with a permeable membrane 11, a central port 12 for collecting the permeable fluid, a permeable fluid outlet pipe portion 13 at the end of the central port, and the like. An O-ring mounting groove is provided on the outer peripheral surface of the. In this filtration element 1, for example, a membrane is attached to both sides of a membrane support plate, and a unit in which the inner and outer peripheral edges of the membrane are sealed to the support plate is laminated, and each unit is attached to the central port of this laminate. A disk type can be used in which the permeate fluid passage between the membrane and the support plate is in communication.

Reference numerals 21 and 22 denote a case main body and a case lid which form the housing 2. The case lid 22 is provided with a permeated fluid outlet 221 and a boss 222.
And a filter element connecting hole 223 is provided in the boss 222. Reference numeral 3 is a bypass passage opened from the outer surface of the boss 222 to the inner end of the filter element connecting hole 223, and 4 is a filter medium attached to the inlet of the bypass passage 3. Reference numerals 5 and 5 are O-rings, and the permeated fluid outlet pipe portion 13
It is mounted in the O-ring mounting groove, and the O-ring mounting port pipe portion 13 is inserted into the filter element connecting hole 223.

The case body 21 of the housing 2 has a fluid inlet 211 to be treated, and the case lid 22 is watertightly screwed to the case body 21.

In the above filter, the permeated fluid outlet pipe portion 13 of the filter element 1 is detachably inserted into the filter element connection hole 223 through the O-rings 5 and 5 to replace the filter element 1. Since it is possible, it is inevitable that a gap is formed between the permeated fluid outlet pipe portion 13 of the filtration element 1 and the filtration element connection hole 223, and the tip end face of the permeated fluid outlet pipe portion 13 and the filtration element are unavoidable. The perimeter 1 of the permeated fluid outlet pipe of the filtration element adjacent to the inner end of the connection hole 223 and adjacent to this portion
A gap a at the corner of the original permeation fluid passage is generated between the filter element 31 and the inner circumference 224 of the filter element connecting hole.

However, since the space on the fluid side before permeation (space in the case) is opened to the above-mentioned entrance corner gap a by the bypass passage 3 in which the above-mentioned filter medium 4 is mounted, this entrance corner gap a. The fluid filtered by the filter medium 4 can be made to flow through the filter element a, and the filter element a having the same characteristics as the permeable membrane 11 of the filter element 1 such as the removal rate of fine particles or the like can be used to make A fluid that is as clean as or even more than the permeate fluid of the filter element 1 can flow.

FIG. 2 is a sectional view showing another embodiment of the present invention. In this embodiment, the permeated fluid outlet pipe section 1
3 from the side surface of the end plate 14 integrated with the permeated fluid outlet pipe portion 13
A bypass passage 3 extending to the outer surface of the tip end of the bypass passage 3 is provided, and a filter medium 4 is attached to the inlet of the bypass passage 3.

Also in this other embodiment, the permeated fluid outlet pipe portion 13 which is an entrance corner gap with respect to the original permeated fluid passage.
Between the tip end face of the filter element and the inner end of the filter element connecting hole 223 and the permeate fluid outlet pipe outer circumference 131 and the filter element connecting hole inner circumference 2 of the filter element adjacent to this portion.
By allowing the fluid filtered by the filter medium 4 to flow in the gap a between the filter element 24 and the filter element 4, the filter element 4 having the same characteristics as the permeable membrane of the filter element 1 or the fine particle removal rate or the like is used. A fluid that is as clean as or equal to the permeated fluid of the filter element 1 can flow through the above-mentioned entrance corner gap a.

[0018]

The fluid filter of the present invention has the above-described structure, and is inserted between the permeated fluid outlet pipe portion of the filtration element and the filtration element connection hole into the original permeated fluid passage. Even if there is a gap between the corners, a fluid that is as clean as or equal to the fluid that permeates through the filter element can flow through the gap at the entering corner.

Therefore, it is possible to thoroughly clean the adhering fine particles in the above-mentioned corner gaps by permeation cleaning before using the filter, and to prevent the adhering / accumulating of fine particles in the above-mentioned corner gaps during use of the filter (hence, accumulation). It is possible to eliminate the mixture of coarse particles generated by the separation of coarse particles into the permeate fluid), and the solvent in the upper filling corner gap after the filter is pretreated with a solvent or the like can be easily extruded and replaced by the permeate fluid. It is possible to provide a filter with high cleanliness, such as replacement of internal air with an inert gas before use at high speed, and a short startup time at the start of use. It is useful for producing ultrapure water and removing fine particles in circulating chemicals.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional explanatory view showing another embodiment of the present invention.

FIG. 3 is a cross-sectional explanatory view showing a conventional example.

[Explanation of symbols]

 1 Filtration Element 13 Permeate Fluid Outlet Pipe 2 Housing 223 Filtration Element Connection Hole 3 Bypass Passage 4 Filter Media 5 Packing

Claims (1)

[Claims] 1. A permeated fluid outlet pipe portion of a filtration element,
A filter, which is inserted into a filter element connection hole of a housing that houses a filter element through a packing and blocks the permeate fluid side and the pre-permeate fluid side by the packing, wherein A filter for fluid, characterized in that a bypass passage that opens between the pre-permeation fluid side is provided in a gap that is present between the element connection hole and communicates with the permeation fluid side, and that a filter medium is attached to this bypass passage.