JPH05137913A - Liquid filter and filter bag - Google Patents

Abstract

PURPOSE: To hold a filter bag in a filter housing with an arbitrary and an economical structure to form a liquid filter by providing a shape-retaining edge portion of the filter bag with an inverted V-shaped part terminating in an annular upturned lip part. CONSTITUTION: The aperture of the housing 12 consisting of an annular side wall 14 and a recessed bottom wall 16 is provided with the annular lip 28 projecting to the inner side at the extension of the side wall 14. On the other hand, the filter bag 38 is formed of a shape-retaining material and includes a ring 44. The ring 44 is provided with the annular inverted V-shaped part 46 terminating in the annular upturned lip part 48. When such filer bag 38 is inserted into a basket 34 in the housing 12 and is pushed downward, the lip part 48 deflects to the inner side after coming into contact with the lip 28 of the housing 12 and stops at the upper side of a supporting part. The filter bag is well held in the housing in the manner described above, to make the liquid filter.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to the construction of liquid filters and filter bags used within the filters.

[0002]

2. Description of the Related Art Conventionally, a filter bag having a shape-retaining edge portion which is impermeable to liquid and serves to define an open end of the bag is unique depending on a specific method of mounting the bag in a filter housing. It has the structure of. For example, in U.S. Pat. No. 4,133,769, the bag is formed with an outwardly facing flange that fits between a support or shoulder and the lip of the filter to form a self-supporting filter bag. .. U.S. Pat. No. 4,259,188
In U.S. Pat. No. 5,968,962, an inverted V-shaped edge is formed in the opening of the filter bag, and this edge is fitted on a vertically extending lip or rim, and the two are crimped by a filter cap or top.

[0003]

It is an object of the present invention to provide a liquid filter having a filter bag that can be retained in the filter housing in more than one arbitrary way.

Another object of the present invention includes a shape-retaining edge that defines an opening into the bag and includes an upwardly facing annular lip that allows the bag to be constrainedly fit into the filter housing. It is to provide a liquid filter having a filter bag.

Another object of the present invention is to provide a filter bag with a shape-retaining edge that forms an opening into the bag and that allows the bag to be retained within the filter housing in a number of arbitrarily selectable ways. To provide.

[0006] Yet another object of the present invention is to provide a liquid filter bag which has an economical structure and can be used in a plurality of ways.

Other objects of the present invention will be apparent from the following description.

[0008]

To achieve the above object, a liquid filter according to the present invention comprises a housing defining a chamber therein, the housing having an upper opening into the chamber, A cap covering the housing opening, the housing including an annular support extending around the housing within the chamber, the inlet and outlet ports arranged for fluid communication through the annular support. A filter bag having an opening defined by a flexible shape-retaining edge for filtering liquid, the opening edge of the filter bag being liquid impermeable and terminating in an annular upward lip. A lip having a letter-shaped portion, at least a portion of the lip portion extending at an acute angle with respect to the V-shaped portion, and the housing being located above the support portion and spaced from each other. Including and in the filter bag is mounted in the chamber, a state in which the lip portion of the filter bag is located between the housing support and the housing lip.

[0009]

That is, according to the present invention, the shape-retaining edge portion of the filter bag is provided with the inverted V-shaped portion which terminates in the upwardly extending lip portion. The combination of these components allows the filter bag to have its upwardly extending lip constrained to fit between the lip and the support of the filter housing, or into a filter housing without a lip. Alternatively, it can be used in any manner as a self-supporting bag by fitting it into the filter housing onto an upwardly projecting lip or rim that fits into the inverted V-shape of the bag edge. Thus, a uniquely shaped filter bag is obtained that can be used in any manner to be retained within the filter housing.

[0010]

The preferred embodiment of the invention described below was chosen for purposes of illustration and description.

The filter 10 shown in cross section in FIG. 1 comprises a housing 12 formed by an annular side wall 14 and a concave bottom wall 16. Legs 18 extend outwardly from the housing 12 and are used to support the housing on the floor. The upper open end of the housing 12 has a top or cap 2
Covered by 0. The cap 20 is fixed to the housing 12 by a removable threaded push-down member 22. An O-ring seal 24 is crimped between the cap and the housing to form a liquid tight seal.

An annular shoulder or support 26 is formed in the upper edge of the housing side wall 14 along the perimeter of the opening into the housing. Located in proximity to, but spaced above, the support 26 is an inwardly projecting annular lip 28 which forms part of the housing sidewall 14. Filter 10
Has an inlet port and an outlet port, which are shown in this embodiment as an inlet port 30 formed in the cap 20 and an outlet port 32 formed in the bottom wall 16 of the housing 12.

A basket 34 having a mesh wall 36 is mounted in the housing 12. The purpose of the basket 34 is to support the filter bag 38, so that the basket is formed into a rigid shape-retaining structure. An outwardly facing annular flange 40 is formed in the opening into the basket 34, the outer diameter of this basket flange being larger than the inner diameter of the housing support 26, and the flange 40 supporting the support 2.
The basket can be supported in the housing by being mounted on the housing 6. As far as I have explained above,
The filter 10 is of the same shape and type as described in the aforementioned U.S. Pat. No. 4,133,769.

The filter bag 38 includes a wall 42 formed of a flexible liquid permeable material such as woven nylon, cotton or wool, and a ring 44 formed of a flexible shape-retaining material such as nylon or polypropylene. To do. A bag ring 44 forms an opening defining edge into the bag and is attached to the wall 42 by stitching or heat sealing. Ring 44 includes an annular inverted V-shaped portion 46 that terminates in an annular upward lip 48. The upward lip portion 48 makes an acute angle with the annular inverted V-shaped portion 46.

Filter bag 3 measured at lip 48
The outermost outer diameter of 8 is larger than the innermost inner diameter of the housing lip 28. In such a configuration, with the flange 40 seated on the support portion 26 of the housing, the basket 34 is inserted into the chamber 13 formed by the housing 12, and then the filter bag 38 is inserted into the basket 34 to move downward. When pushed down, its lip 48 first contacts the upper edge of the housing lip 28, then flexes inwardly past the housing lip and extends outwardly below the housing lip and above the support 26 for snap-fitting. , Becomes self-supporting in the filter housing. When the basket 34 is used in a filter, as in the illustrated embodiment, an inverted V-shaped portion 46 of the bag ring.
The outermost bottom edge of the is placed on the flange 40 of the basket. It should be noted that in some applications of the filter bag 38, the basket 34 may not be needed to support the bag or may not be used within the filter housing. Alternatively, the filter bag may be wedge fit into the filter housing with the lip 48 constrained against the housing sidewall. The filter bag 38 of this embodiment has a handle 50 so that the bag can be more easily removed from the filter housing when the bag is replaced.

In some applications of the filter bag 38, a filter housing having an upwardly projecting annular lip, such as that described in the above-referenced US Pat. No. 4,259,188, is used to house the bag. Sometimes used.
In such a construction, an upwardly projecting annular lip fits into the inverted V-shaped portion 46 to support the bag within the filter housing, as shown schematically in the above-referenced patent. Are fitted.

It should be understood that the invention is not limited to the details described above, but may vary within the scope of the claims.

[0018]

As described above, according to the present invention, there is provided a filter bag which has an economical structure and can be held in a filter housing by any method more than one, and a liquid filter using the filter bag. can get.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a filter housing illustrating the usage of a filter bag.

FIG. 2 is a partial perspective view of a filter bag with a portion of the bag removed for purposes of illustration.

[Explanation of symbols]

 10 Filter 12 Housing 13 Chamber 20 Cap (Top) 26 Housing Annular Support 28 Housing Lips 30, 32 Inlet and Outlet Ports 34 Basket 38 Filter Bag 44 Flexible Shape Retaining Edge (Ring) 46 Reversed V-Shaped Portion 48 Upward lip

Claims (6)

[Claims] 1. A housing having a housing defining a chamber therein, the housing having an upper opening into the chamber, and a cap covering the housing opening, wherein the housing surrounds the housing in the chamber. An elongated annular support, having inlet and outlet ports arranged for fluid communication through the annular support, having an opening defined by a flexible shape-retaining edge, A filter bag for filtering is provided, and an opening edge portion of the filter bag is impermeable to liquid, and has an annular V-shaped portion terminating in an annular upward lip portion, and at least a part of the lip portion is V-shaped. Extending at an acute angle to the profile, the housing includes a lip spaced above the support, the filter bag mounted in the chamber,
A liquid filter in which the lip portion of the filter bag is located between the housing support portion and the housing lip. 2. A reticulated basket having an opening, the basket mounted within the chamber and contacting the housing support along a perimeter of the housing opening, the filter bag extending into the basket, 2. A liquid filter according to claim 1, wherein the opening edge of the basket is located on the basket along the circumference of the basket opening. 3. The liquid filter according to claim 1, wherein the housing lip has an annular shape. 4. A reticulated liquid-permeable portion defining an opening into the filter bag that is connected to the reticulated portion.
Liquid-tight, with a flexible shape-holding edge,
A liquid filter bag, wherein the edge portion includes an annular V-shaped portion facing in the opposite direction, which terminates in an annular upward-facing lip portion, and at least a part of the lip portion extends at an acute angle with respect to the V-shaped portion. 5. A housing defining a chamber therein, the housing having an upper opening into the chamber, and a cap covering the housing opening, wherein the housing surrounds the housing within the chamber. An elongated annular support, having inlet and outlet ports arranged for fluid communication through the annular support, having an opening defined by a flexible shape-retaining edge, A filter bag for filtering is provided, the opening edge of the filter bag is impermeable to liquid, and has an annular V-shaped portion terminating in an annular upward lip portion, and the housing is spaced above the support portion. The filter bag is mounted in the chamber, and the lip portion of the filter bag is located between the housing support portion and the housing lip. Next, the liquid filter lip of the filter bag is directly connected to the V-shaped portion. 6. A reticulated liquid-permeable portion defining an opening into the filter bag and connected to the reticulated portion.
Liquid-tight, with a flexible shape-holding edge,
A liquid filter bag, the edge portion of which includes an annular inverted V-shaped portion terminating in an annular upwardly facing lip portion, the lip portion being directly connected to the V-shaped portion.