JPS6234405B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a filter having an improved filter element.

A filter according to the invention has a housing with side walls defining a chamber. The housing has a chamber opening formed therein. This opening is covered with a cap. A filter element, such as a filter screen or bag or associated retaining cage, is encased within the housing and abuts the housing to form a fluid seal between the opening and the housing. The filter element may be fitted with a stop such as a cam lock. This stop is for engaging the filter element with the housing.

It is an object of the present invention to provide a liquid filter with an improved filter bag.

Another object of the invention is to provide a liquid filter having a reticulated filter element that can still be independently retained within the housing.

Another object of the present invention is to provide a liquid filter having a filter bag that cooperates with a housing to form a complete seal around the filter bag inlet.

Still another object of the present invention is that a wall made of a flexible material that allows liquid to pass therethrough and a ring made of a shape-retaining material that does not allow liquid to pass are joined together by a cylindrical part on the inner peripheral edge of the ring and an upper edge of the wall. It is an object of the present invention to provide a liquid filter having a filter bag according to the present invention.

Next, embodiments of the present invention will be described with reference to the drawings.

As shown in FIGS. 1-6, filter 10 includes a housing 12 having a side wall 14 defining an interior chamber 17 and a bottom wall 16. As shown in FIGS. The housing 12 has an opening 18 formed into the interior chamber 17 by a peripheral edge 20 of the side wall 14 and a bottom wall 16 of the housing 12.
It is placed opposite. Periphery 20 of side wall 14
A cap 22 rests on top and is held in place by a plurality of removable fixing screws 24. An O-ring 26 is compressed and provided between the cap 22 and the housing 12 as a liquid sealing material.

Cap 22 connects inlet 28 and housing 1
The bottom wall 16 of 2 has an outlet 30. Liquid passes through filter 10 from inlet 28 to outlet 30. The bottom wall 16 of the housing 12 is provided with legs 3 for keeping the filter 10 upright during use.
2 is installed. Filter 1 mentioned above
0 is a commercially available standard structure.

Side wall 14 of housing 12 has an annular shoulder 34 . The shoulder 34 is spaced from the peripheral edge 20 of the housing 12. The shoulder 34 is interrupted by two slots 36 at opposite positions on its circumference. Side wall 14 of housing 12
also has an annular flange 38. This flange 3
8 is spaced apart from shoulder 34 and between shoulder 34 and peripheral edge 20 of housing 12 .

Fitted inside the housing 12 is a cage 40 having a mesh wall 42. Since this basket 40 is for supporting the filter bag 44, it has a rigid shape-retaining structure. The cage 40 has an annular flange 46 extending along the periphery of the opening.
is formed. The outer diameter of the flange 46 of the cage 40 is larger than the inner diameter of the shoulder 34 of the housing 12, but smaller than the inner diameter of the flange 38 of the housing 12, so that the cage 40 can be removably inserted into the housing 12 through the opening 18. , the flange 46 can rest on the shoulder 34 . A pair of stoppers 48 are attached to the mesh wall 42 of the cage at positions facing each other on the circumference below the flange 46. This stopper 48 is inserted into the slot 36 of the shoulder 34, as shown in phantom in FIG.
It is dimensioned so that it can pass through. stoppa 4
8 passes through the slot 36 to the inner peripheral edge 3 of the shoulder 34.
5, rotate the car 40 relative to the housing 12 so that the stop 48 is below the continuation of the shoulder 34, as shown in FIGS. 1 and 5. Since the distance between the stopper 48 and the flange 46 is only slightly larger than the wall thickness of the shoulder 34, when the stopper 48 is below the continuous portion of the shoulder 34, the car 40 is noticeably pulled back upward from the housing 12. You can prevent this from happening. The filter bag 44 has a wall 5 made of a flexible liquid-permeable material, such as a blend of nylon, cotton or wool.
0 and a ring 52 made of a flexible shape-retaining material, such as nylon or polypropylene. This ring 52 forms an opening 54 of the filter bag 44, and a cylindrical internal annular lip 53 extending downward in the drawing is attached to the wall portion 50 by stitching, heat-resistant sealing, or the like. Ring 52 has an overhanging flange 56 with a pointed lip 58 at its periphery. The peripheral diameter of lip 58 is slightly larger than the inside diameter of sidewall 14 measured between shoulder 34 and flange 38 and above shoulder 34.

After removing the cap 22 and resting the flange 46 of the car 40 on the shoulder 34, the filter bag 44 is placed in the car 40, with the lip 58 initially attached to the housing, as shown in FIGS. It is bent upwardly by a small flange 38 projecting inwardly of 12, but then it passes over the flange 38 and fits under it. When the flange 56 of the filter bag 44 is snugly fitted between the flange 38 and the annular flange 46 of the cage 40, the lip 58
The peripheral edge of the housing 12 contacts the side wall 14 of the housing 12 to form a liquid seal. Arrow 60 in Figure 1
The liquid flow indicated by 2 causes the flange 56 of the filter bag 44 to force the flange 46 of the cage 40 downwardly so that the cage 40 is held securely within the housing 12. The liquid first enters the inlet 28
The liquid then enters the filter bag 44 through the liquid-permeable wall 50 of the filter bag 44 and the aperture 62 formed in the cage 40 and exits through the outlet 30.

The ring 52 of the filter bag 44 has a pair of tabs 64 that are integrally formed with the flange 56 of the filter bag 44. Remove cap 22 from filter 10 and remove tab 64 as shown by arrow 57 in FIG.
When pulled outwardly, flange 56 flexes out of engagement with flange 38 of housing 12, allowing filter bag 44 to be removed from filter 10 for replacement or cleaning.
The wall 50 of the filter bag 44 normally remains in close contact with the basket 40 until the filter bag 44 is removed from the filter 10. To this end, the car 40 is moved toward the opening 18 of the housing 12 until the stopper 48 of the car 40 contacts the inner circumferential edge 35 of the shoulder 34, but further outward movement of the car 40 is prevented; Thereafter, only the filter bag 44 is pulled out.

Another example of a filter is shown in FIGS. 7 and 8. In this embodiment, housing 1
2, instead of the flange 38, an annular groove 66 is provided between the shoulder 34 and the inner peripheral surface 20 of the end portion of the housing 12. The diameter of the side wall 14 of the housing 12 at the deepest part of this groove 66 is the diameter of the filter bag 44.
The diameter is slightly smaller than the diameter of the peripheral edge of the lip 58. The ring 52 is inserted into the housing 12 by bending the lip 58 outwardly as shown in FIG.
is pushed into the groove 66. When the lip 58 bursts into the groove 66, the filter bag 44 joins the housing 12 as shown in FIG. At this time, it is desirable that the flange 56 of the filter bag 44 be brought into contact with the flange 46 of the car 40 from above. In this embodiment, the tight fit of lip 58 into groove 66 forms a liquid seal between filter bag 44 and housing 12. The operation of the filter of the embodiment shown in FIGS. 7 and 8 is similar to that of the embodiment of FIGS. 1-6. The filter bag 44 of FIGS. 7 and 8 can be removed from the basket 40 by pulling tab 64 outwardly.

FIG. 9 shows yet another embodiment of the invention. In this embodiment, the housing 12
A smooth inner circumferential surface is formed between the shoulder portion 34 of the side wall 14 and the inner circumferential edge portion 20. The inner diameter of side wall 14 between shoulder 34 and inner peripheral edge 20 is smaller than the outer diameter of lip 58. Ring 52 is pressed into housing 12. The lip 58 then contacts the side wall 14 above the shoulder 34. This not only creates a liquid seal between the lip 58 and the side wall 14, but also allows the filter bag 44 to
The flange 56 of the cage 40 is the overhanging flange 46 of the cage 40.
Since the car 40 contacts the shoulder 34 from above, the car 40 contacts the shoulder 34. When the filter cap 22 is attached to the housing 12 and the opening 18 is capped, liquid flow through the filter exerts pressure on the outer surface of the lip 58 and strengthens the seal between the lip 58 and the side wall 14 of the housing 12. . The filter bag 44 of the FIG. 9 embodiment can be removed by pulling upwardly on the tab 64 on the filter bag 44.

In each of the embodiments of FIGS. 1-9, the contact between the lip 58 and the housing 12 forms a substantially perfect seal between the filter bag 44 and the housing 12 at the ring 52. For this reason, even if the cap 22 is removed, the liquid level inside the filter 10 will not be higher than the lower end of the downward cylindrical lip 53 of the ring 52, so if it is necessary to remove the filter bag 44, the tab 64
can reach out to.

The wall 50 is joined to the cylindrical lip 53 of the ring 52 so that its diameter is equal to that of the housing 12.
It can be precisely dimensioned to fit the opening of the This improves the filtration efficiency of the filter.

The filter 10 shown in FIGS. 10, 11 and 12 has a side wall 1 forming an interior chamber 17.
4 and a bottom wall 16. The housing 12 has an opening 18 into the interior chamber 17 formed by the peripheral edge 20 of the side wall 14 thereof. This opening 18 is opposed to the bottom wall 16. A cap 22 is placed over the opening 18. This cap 22 is connected to the peripheral edge 2 of the housing side wall 14.
0 and is held in place by a plurality of removable fixing screws 24. An O-ring 26 is provided in a compressed state between the cap 22 and the housing 12 as a liquid sealing material.

An inlet 28 is formed in the cap 22 and an outlet 30 is formed in the bottom wall 16 through which liquid passes into the filter 10. Bottom wall 16
Legs 32 are attached to the filter 10 to keep the filter 10 upright during use. side wall 14
An annular shoulder 34 is formed spaced apart from the peripheral edge 20 of the housing 12 . An inner circumferential end surface 80 is formed on this shoulder portion 34, and this inner circumferential end surface 80
Pins 82 are provided diametrically opposed to each other.

A filter screen (also referred to as a filter screen) 84 is fitted within the housing 12 . The sieve 84 has an annular shape-retaining flange 86 and walls that are impermeable to liquids. The wall has a rigid ring 68 joined to a flange 86 and an enclosed mesh filtration member 70, which may be wire mesh, plastic mesh, or fabric. Two diametrically opposed slots 72 are formed in the ring 68.
Each slot 72 has an inclined cam surface 74 on a portion thereof. An O-ring 76 is attached to the shoulder portion 34.

To assemble the sieve 84, place the sieve 84 into the interior chamber 17 through the opening 18 and position the sieve 84 by aligning the mouth 78 of the slot 72 with the pin 82. The pin 82 is then located in the longitudinal part of the slot 72. Screen 84 is then rotated relative to housing 12 to bring pin 82 into slidable contact with cam surface 74 of slot 72. This cam surface 7
4 is for urging the flange 86 against the shoulder portion 34. To this end, flange 86 and shoulder 34
The O-ring 76 is compressed between the housing 12
An annular liquid seal is formed between the sieve 84 and the sieve 84 . The sieve 84 can be removed from the housing 12 by turning it in the opposite direction.

In some embodiments, contrary to the illustrated example, pins are formed on the outer circumferential surface of the rigid ring 68 of the sieve 84, and slots are formed on the inner circumferential end surface 80 of the facing shoulder portion 34. Also, the number of pins and slots may vary depending on the size of the filter. A filter bag may be used in conjunction with sieve 84.

In some embodiments, both the inlet and outlet are integrated into the housing rather than the cap.

The liquid filter of the present invention is particularly characterized by a filter element attached to its housing. It is sometimes used in conjunction with a rigid cage. Each of these filter elements has a ring of liquid-impermeable shape-retaining material around the open periphery of its steel section, and this ring section is attached to an annular shoulder on the inside near the side wall end of the housing. It is mounted inside the housing in a mounted manner. Thus, the liquid filter of the present invention allows easy installation of its filter elements and easy replacement of clogged bags. The filter bag also typically has a tapered lip on the outer edge of the ring flange at its opening, so that when the ring portion rests on the housing shoulder as described above, the outer edge lip presses firmly against the inner peripheral surface of the housing side wall. Pressed together to form a circumferentially secure hermetic seal. Also, at this time, the upper edge ring of the filter element is constantly pressed against the annular shoulder by the hydraulic pressure applied to the inside of the bag during liquid filtration, and exhibits the function of extremely effectively preventing short circuits in channels other than the bag. In order to improve the liquid sealing properties of this upper edge ring, it is easily applicable to the present invention to use an elastic sealant between the members that are pressed against each other, or to increase the pressing force by tightening the cam means. , the effect can be further enhanced.

[Brief explanation of the drawing]

1 is a longitudinal sectional view of one embodiment of a filter according to the invention; FIG. 2 is a partial sectional view of the filter bag of FIG. 1 being placed within the filter housing; and FIG. 3 is a partial sectional view of the filter bag of FIG. 4 is a partial sectional view of the filter bag of FIG. 1 being removed from the filter housing; FIG. 5 is a partial sectional view of the filter bag of FIG. 5-5 cross-sectional view of the filter in Figure 1, No. 6
The figure shows the correct position of the mesh basket when removed from the housing with chain lines, and is a diagram of the area surrounded by chain line 6 in Figure 5. Figure 7 shows another example of a filter in which the filter bag is being inserted into the housing. 8 is a partial sectional view of the filter of FIG. 7 with the filter bag seated; FIG. 9 is a partial sectional view of yet another embodiment with the filter bag seated in the housing; FIG. 10; 11 is a partial sectional view taken along line 11-11 in FIG. 10, and FIG. 12 is a partially exploded perspective view of the housing and the screen mounting member. DESCRIPTION OF SYMBOLS 10... Filter, 12... Housing, 14... Side wall, 22... Cap, 28... Inlet, 30... Outlet,
34... Annular shoulder, 40... Rigid cage, 44... Filter bag, 46... Basket flange, 48... Stopper, 50... Filter bag wall, 52... Filter bag ring, 53... Cylindrical inward lip, 56
... overhang flange, 58 ... outer edge lip, 68 ... rigid ring of filter screen, 70 ... filtration wall of filter screen, 72 ... slot, 74 ... inclined cam surface, 82 ... pin, 84 ... filter screen (sieve).

Claims (1)

Claims: 1. A housing comprising a side wall defining a chamber, having an opening at one end of the chamber for inserting and removing a filter element, and an annular shoulder defining at least a portion of the opening; a liquid filter having an inlet and an outlet for the filtrate, the filter bag comprising a wall made of a flexible material through which the liquid passes; a ring of liquid-impermeable shape-retaining material comprising an annular flared flange having a cylindrical inward lip and a tapered outer lip defining an opening in the filter bag;
The wall of the bag is joined to a cylindrical inward lip,
A filter bag is seated within the chamber with an overhang flange resting on the annular shoulder of the housing, a wall of the bag extending into the liquid passageway between the inlet and outlet, and an overhang flange of the ring. A liquid filter having a tapered outer lip in contact with a shoulder of the housing and an inner peripheral surface of the housing periphery to form an annular hermetic seal between the filter bag ring and the housing. 2. The filter element includes a generally conformal rigid cage that contacts the outer surface of the wall of the filter bag, the annular flared flange of the filter bag inwardly overlapping the annular flange forming the opening edge of the rigid cage and the outer surface of the housing side wall. 2. A liquid filter according to claim 1, wherein the filter bag is supported on an annular shoulder and wherein the wall of the filter bag is held spaced from the side wall of the housing by a rigid cage. 3. The above-mentioned rigid cage has a plurality of stoppers protruding from the outer circumferential surface of the cage at positions slightly larger than the thickness of the annular shoulder of the housing from the annular flange, and when only the filter bag is removed from the housing. 3. The liquid filter according to claim 2, wherein the cage is left in the housing with the stopper being locked by the annular shoulder. 4. A liquid filter comprising a housing having a side wall forming a chamber, having an opening at one end of the chamber for inserting and removing a filter screen, a removable cap for the opening, and an inlet and an outlet for the filtrate. The housing has an annular shoulder protruding into the chamber adjacent to the opening and spaced from the cap, the shoulder having an inner peripheral edge formed with a cylindrical end surface; The filter screen is comprised of a horizontal flange supported on the annular shoulder, a cylindrical rigid ring following the inner edge of the horizontal flange, and a mesh filtration wall joined to the rigid ring and extending into the housing, the filtration wall being connected to the side wall of the housing. cam means spaced apart from and disposed in the liquid passageway between said inlet and outlet for urging said horizontal flange onto an annular shoulder of the housing upon rotation of the filter screen relative to the housing; A liquid filter provided relative to the inner circumferential end surface of the annular shoulder and the outer circumferential surface of the rigid ring. 5. A liquid filter according to claim 4, wherein the housing has an annular resilient seal on its annular shoulder, and the horizontal flange of the filter screen is pressed against this seal to form a liquid seal. . 6. The cam means is formed with a suitable number of pins provided on either the rigid ring of the filter screen or the annular shoulder of the housing, and opposite the pins formed on either the rigid ring or the annular shoulder on the other side. When the filter screen is inserted into the housing, the pins enter the opposing slots, and when the filter screen is rotated, the pins engage with the inclined cam surface formed in a part of the slot. 5. A liquid filter according to claim 4, wherein the horizontal flange of the filter screen and the annular shoulder of the housing are pressed together to form a liquid seal.