JP2002263429A - Apparatus for filtering fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid filtering apparatus provided with a plastics bag for handling a filter element, in which the damage of the filter element is prevented and the filtration action is secured stably by preventing the plastics bag from being expanded abnormally when used normally. SOLUTION: This fluid filtering apparatus 20 is provided with a casing 23 having an air sucking port 5 and an air exhausting port, the filter element 9 which is installed in the casing 23 to be freely attached or detached and through which the fluid to be filtered is made to flow, a freely detachable cover 11 for closing the opening of the casing 23, the freely expandable plastics bag 13 which is positioned in the casing 23 on the inside of the cover 11 and whose contact part with the casing 23 is sealed and a circular fitting pedestal 25 is formed protrusively to the inside of the casing 23 and an inside cover 27 which is positioned between the bag 13 and the element 9 is freely detachably attached to the pedestal 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid filtration device, and more particularly, to a structure of a fluid filtration device suitable for filtering gas.

[0002]

2. Description of the Related Art In a fluid filtration apparatus, a filtration member (hereinafter, referred to as a filter element) having pores through which a fluid permeates is generally used. As they accumulate and accumulate, they need to be cleaned or replaced with new filter elements as foreign matter builds up. In such a fluid filtration device, when it is not preferable that foreign substances or the like captured by the filter element be released to the outside atmosphere, a bag such as a vinyl bag is used as shown in FIG. Explaining this, the casing 3 of the filtration device 1 is provided with an intake port 5 on the lower surface and an exhaust port 7 on the side surface. A filter element 9 is provided in the inside so as to cover the intake port 5, and a detachable lid 11 is fixed to an upper portion by a mounting bracket (not shown). The above-mentioned vinyl bag 13 is provided inside the lid 11, and the peripheral fixed seal 15 is closely attached to the outer surface of the casing 3 so that the casing 3
Shield the internal space from outside. The gas to be filtered enters through the inlet 5, flows through the filter element 9, and exits through the outlet 7.
Captured by the filter element 9.

[0003]

However, in the above-mentioned conventional fluid filtration device, the following problems occur. That is, the internal pressure P ₁ of the vinyl back 13 is basically dependent on the external ambient pressure e.g. atmospheric pressure at the time of mounting. On the other hand, in the casing 3, as described above, an airflow passing through the filter element 9 is generated, so that the pressure decreases,
A difference occurs between the internal pressure of the vinyl bag 13 and the ambient pressure of the filter element 9, and the vinyl bag 13 protrudes as shown exaggeratedly in FIG. This tendency is remarkable especially when the fluid is sucked by the exhaust fan. If the vinyl bag 13 is greatly deformed, the filter element 9
There is a possibility that the fluid flow path passing through the airbag may be narrowed, the filtering function may be reduced, and the vinyl bag 13 itself may be damaged. Accordingly, an object of the present invention is to provide a fluid filtering device that does not cause damage to a vinyl bag or a bag.

[0004]

According to the present invention, there is provided, in accordance with the present invention, a fluid filtering device comprising: a casing having a fluid inlet and an outlet; It has a filter element that flows through, an outer lid that removably closes the opening of the casing, and an inflatable bag that is provided inside the casing and located inside the outer lid and sealed between the casing and the casing. At the same time, an annular mounting seat is formed to protrude inside the casing, and an inner lid located between the bag body and the filter element is detachably provided on the mounting seat.

[0005]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that the same portions are denoted by the same reference numerals throughout the drawings. First, referring to FIG. 1, in a filtration device 20, a casing 23 is provided with an intake port 5 on a lower surface and an exhaust port 7 on a side surface. A filter element 9 is provided in the inside so as to cover the intake port 5, and a detachable lid 11 is fixed to an upper portion by a mounting bracket (not shown). The vinyl bag 13 as a bag body has a lid 11.
The peripheral fixed seal 15 is provided inside the casing 2.
The inner space of the casing 3 is shut off from the outside by being in close contact with the outer surface of the casing 3. On the inner peripheral surface of the casing 23, an annular mounting seat 25 is formed so as to protrude so as to be located between the filter element 9 and the vinyl bag 13. An inner lid 27 is attached to the mounting seat 25. The inner lid 27 has a fixing claw 29 on the outer peripheral portion and a handle 31 on the upper surface. The notch through which the above-mentioned claw 29 passes is formed in the mounting seat 25, and the knob 31 has a shape and size that can be grasped by an operator via the work glove and the vinyl bag 13. The inner lid 27 gripped and held by the knob 31 is lowered so that the claw 29 passes through the notch, and is rotated around the central axis at an appropriate angle when the claw 29 passes through the mounting seat 25. By doing so, the inner lid 27 is attached to the annular mounting seat 2 as shown in the figure.
5 will be on top.

[0006] In the fluid filtering apparatus 20 having the above-described structure, the air flow enters the casing 23 through the intake port 5,
The gas flows through the filter element 9 and flows out of the exhaust port 7. At this time, the wake foreign matter having a predetermined size or more is captured by the filter element 9 and removed. Then, the pressure in the casing 23 is reduced by the above-described airflow as compared with the time of assembly. Since the internal pressure of the vinyl bag 13 is at the value at the time of assembly, a pressure difference occurs, and the vinyl bag 13 having the bellows structure is pulled downward and expands. However, the expansion displacement is limited by the inner lid 27 as shown in FIG. Thus, the vinyl bag 13
That is, abnormal deformation of the bag is prevented to prevent damage, and a gas flow path through the filter element 9 is ensured, so that the filtering action is always well maintained.

A further improved embodiment will be described with reference to FIG. Explaining only the parts different from the above-described embodiment, the annular mounting seat 45 of the casing 43 is
5 is the same as that of FIG. 5, but no cutout is provided. The inner lid 47 mounted on the mounting seat 45 has the knob 31 on the upper surface, but has no claws and is provided with a movable pin 49 instead. The pin 49 is expandable and contractible in the radial direction, and is recessed inward at the time of mounting, and protrudes outward at the time of mounting as shown in the figure to securely fix the inner lid 47. An inner lid packing 51 made of an elastic material is provided on the outer peripheral edge of the circular shape. The specific material, dimensions, hardness, and the like of the inner lid packing 51 are set so that an appropriate sealing action can be obtained in consideration of the use atmosphere, working pressure, and the like.

In the above-described fluid filtering device 40, the differential pressure due to the flow of the gas flowing through the filter is transmitted to the inner lid 47 by the contact between the vinyl bag 13 and the knob 31. This is further transmitted to the inner lid packing 51, which is attached to the mounting seat 4.
5 and pressed to seal. Therefore, further expansion deformation of the vinyl bag 13 is prevented and protected.

[0009]

As described above, according to the present invention,
An inner lid provided in the casing is located between the inflatable bag that covers the filter element at the time of replacement and the filter element, and prevents abnormal deformation of the bag at the time of filtration. Damage can be prevented, and the filtering operation can be performed stably without blocking the fluid flow path passing through the filter element.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view illustrating the operation of the embodiment.

FIG. 3 is a cross-sectional view showing another embodiment of the present invention.

FIG. 4 is a sectional view showing an example of a conventional device.

FIG. 5 is a cross-sectional view illustrating a problem of the conventional device.

[Explanation of symbols]

 Reference Signs List 5 intake port 7 exhaust port 9 filter element 11 lid 13 vinyl back 15 peripheral fixed seal 20 fluid filtration device 23 casing 25 mounting seat 27 inner lid 29 claw 31 knob

Claims (1)

[Claims] A casing having a fluid inlet and an outlet;
A filter element that is detachably provided in the casing and through which a filtered fluid flows, an outer lid that removably closes an opening of the casing, and an inner lid that is provided inside the casing and located inside the outer lid. In a fluid filtration device having an inflatable bag body sealed between, an annular mounting seat is formed protruding inside the casing, and an inner lid located between the bag body and the filter element, A fluid filtering device, which is detachably provided on the mounting seat.