RU224700U1 - WATER FILTER COVER - Google Patents

Abstract

The utility model relates to the field of water filtration equipment. A cover for a water filter flask, containing a lower part equipped with means for connecting to the water filter flask, an upper part having a convex wall, the outer and inner surfaces of which are at least partially formed by bodies of rotation, and the ratio S ₁ /S ₂ is from 0.5 to 0.37, where S ₁ is the area of the part of the square K, located above the middle line, passing in the section of the mentioned wall at an equal distance from the outer and inner surfaces of the wall, S ₂ - the area of the part of the square K, located below the middle a line located in the section of the said wall at an equal distance from the outer and inner surfaces of the wall. In this case, the square K lies in the secant plane, and its lower corner is located in the interface zone of the upper and lower parts of the cover at a distance R from its axis, and the upper corner is located on its axis. The cross-sectional shape of the said wall is such that between the upper and lower lines formed at the intersection of the cutting plane with the outer and inner surfaces of the said wall, a line with a radius of curvature varying in the range from 94% to 118% R can be inscribed. The technical result is to achieve a high relationship between strength and material consumption. 7 ill., 1 tab.

Description

FIELD OF TECHNOLOGY TO WHICH THE UTILITY MODEL RELATES

The utility model relates to the field of water filtration equipment, and more specifically to water filter flask caps.

BACKGROUND OF THE ART

The ability of container shells to withstand fluid pressure is influenced by many factors, the main ones being the wall material, its thickness and shape.

Filter cover (RF patent for utility model No. 208898, having a threaded part, an upper part of the form and fittings for connecting to pipelines. The upper part of the cover is dome-shaped. However, in the published description of the patent there is no information that would allow determining the parameters characterizing the shape of the cover and influencing its strength along with the choice of material and wall thickness, in particular, the radius of curvature, the relationship between the height of the top and the diameter cannot be determined from the figures available in the patent, since they are conditional and are not drawn to scale. and do not have other geometric references that allow quantitative calculations.

Food-grade plastics are currently used to make filter covers due to their ease of molding. However, in terms of strength and resistance to deformation, food-grade plastics are significantly inferior to stainless steel, and therefore plastic lids must have a fairly thick wall. Moreover, the wall thickness is usually chosen with a large margin, taking into account many factors: many factors:

instability of the plastic composition,

casting defects (for example, gas bubbles, uneven filling of the mold),

internal stresses due to uneven cooling in the mold,

mechanical stress when connecting to pipelines,

hydraulic shocks,

pressure surges,

increased fragility with decreasing temperature, etc.,

increased fluidity when using hot water.

However, an increase in wall thickness leads to a significant increase in the material consumption of the product, which becomes especially noticeable in the manufacture of large-diameter lids.

In this regard, achieving the required strength only by increasing the wall thickness leads to unsatisfactory results in terms of their material consumption and it is necessary to propose some alternative approach to improve the ratio between strength and material consumption.

UTILITY MODEL DISCLOSURE

The objective of this utility model is to create a cover for a water filter that has a better ratio between strength and material consumption compared to the analogue mentioned above.

The technical result achieved when using the proposed cover is to achieve a high ratio between strength and material consumption.

It was found that flat lids, all other things being equal, are inferior to convex ones. Among the convex caps, not all are equally strong, for example, spherical caps are stronger than conical caps. The strength is also influenced by the geometric parameters of convex bodies, for example, all other things being equal, the strength of spherical lids depends on the ratio of their height to diameter (and the associated ratio of the radius of curvature to the diameter).

The best results in terms of strength and resistance to deformation were achieved, all other things being equal, when the area ratio S ₁ /S ₂ (Fig. 7) was in the range from 0.5 to 0.37. This ratio characterizes the degree of convexity of the top of the lid. With significant deviations from the optimal values (when the top is strongly convex, voluminous, or, conversely, flattened), the strength of the lid decreases, and therefore, to compensate, it is necessary to increase the wall thickness, which in turn increases material consumption. It must be taken into account that not every wall shape that provides the specified S ₁ /S _{2 ratio,} which is optimal. It must be taken into account that the section must be fairly smooth without sharp breaks or other unusual local features that concentrate stress. In this regard, in addition to the ratio S ₁ /S _2, it is necessary that throughout the entire length from the interface between the upper and lower parts of the lid to the axis, the curvature of the wall r does not deviate too much from R equal to the distance from the axis to the interface between the upper and lower parts of the lid. It has been established that any noticeable stress concentration is not observed for lids of any shape with the specified ratio S ₁ /S ₂ when the radius of curvature of the top of the lid is in the range from 94% to 118% R.

Thus, the mentioned problem is solved due to the fact that the proposed cover for the water filter flask contains:

lower part equipped with means of connection with the water filter flask,

an upper part having a convex wall, the outer and inner surfaces of which are at least partially formed by bodies of rotation,

characterized by the fact that it

the ratio S ₁ /S ₂ is from 0.5 to 0.37,

where S ₁ is the area of the part of the square K located above the center line, passing in the section of the mentioned wall at an equal distance from the outer and inner surfaces of the wall;

S ₂ - the area of the part of the square K, located below the center line, located in the section of the mentioned wall at an equal distance from the outer and inner surfaces of the wall,

in this case, the square K lies in the secant plane, and its lower corner is located in the interface zone of the upper and lower parts of the cover at a distance R from its axis, and the upper one is on its axis, and

the cross-sectional shape of said wall is such that between the upper and lower lines formed at the intersection of the cutting plane with the outer and inner surfaces of said wall, a line with a radius of curvature varying in the range from 94% to 118% R can be inscribed.

The above-described cover, in one of its particular forms, may have a ratio S ₁ /S ₂ =0.4÷0.1, and its upper part has the shape of a hemisphere with a radius of 200±3 mm.

The above-described cover, in one of its particular forms, can have an R from 160 mm to 200 mm.

The above-described lid, in one of its particular embodiments, may have said upper part in the form of a spherical segment.

The above-described lid, in one of its particular embodiments, may have the above-mentioned upper part in the form of an ellipse or parabolloid segment.

The above-described cover, in one of its particular embodiments, may have the above-mentioned upper and lower parts made in one piece.

The above-described cover, in one of its particular forms, may have the above-mentioned upper part equipped with inlet and outlet pipes located horizontally.

The above-described cover, in one of its particular forms, may have the above-mentioned nozzles equipped with metal bushings with internal threads for connection to pipelines.

The above-described cover, in one of its particular forms, may have the above-mentioned threaded pipes, the distal part of which is formed by the helical line of the mentioned metal sleeve, and the proximal part by the helical line of the mentioned pipes.

The above-described lid, in one of its particular embodiments, may have an outer surface of the said lower part provided with projections for interaction with the unscrewing equipment.

The above-described cover, in one of its particular forms, may have on its inner side in the interface between the mentioned upper and lower parts an annular platform for placing a sealing ring.

The above-described cover, in one of its particular embodiments, may have the mentioned connection means, which are threads located on the inner surface of the mentioned lower part.

The above-described lid, in one of its particular embodiments, may have a wall thickness of the upper part of about 5-6 mm, and a wall thickness of the lower part of about 5 mm.

The above-described cover, in one of its particular forms, may have an increased wall thickness in the area where the upper and lower parts meet.

The above-described cover, in one of its particular embodiments, may have the above-mentioned wall provided with stiffening ribs having a distal end connected to said lower part, an upper end connected to said central part and a middle part connected to said wall

The above-described cover, in one of its particular embodiments, may contain at least five of the aforementioned stiffeners, at least some of which are located at an equal distance from each other.

The above-described cover, in one of its particular embodiments, may have the mentioned stiffening ribs forming cells of a polygonal shape, preferably triangular, quadrangular, trapezoidal, pentagonal or hexagonal.

The above-described cover, in one of its particular forms, may have a thickness or height of the said stiffeners decreasing from the periphery to the center or decreasing as the distance between the ribs increases.

The above-described cover, in one of its particular embodiments, may have the mentioned stiffening ribs located on the inner side of the wall of the mentioned upper part.

The above-described cover, in one of its particular embodiments, may have the mentioned stiffening ribs located on the outer side of the wall of the mentioned upper part.

The above-described cover, in one of its particular embodiments, may have the mentioned stiffening ribs located on the upper and lower side of the wall of the mentioned upper part.

The above-described cover, in one of its particular forms, may have the mentioned stiffening ribs adjacent to the mentioned wall along the entire length and made integral with it.

The above-described cover, in one of its particular forms, may have the aforementioned stiffening ribs made trapezoidal in cross section for ease of removal from the injection mold.

The above-described cover, in one of its particular embodiments, may have a thickness of said stiffeners of at least 0.3 mm and a height of at least 1 mm.

The above-described cover, in one of its particular forms, may contain at least two pipes.

The above-described cover, in one of its particular forms, may contain a central part having channels communicating with at least one of the said nozzles and with the internal cavity,

The above-described lid, in one of its particular forms, may have a closing hole for air release.

The above-described cover, in one of its particular forms, can be made of plastic, preferably polypropylene.

The lid described above can be used to cover the flask of a water filter, similar to that described in Russian patents for utility model 168717 and 208898.

BRIEF DESCRIPTION OF THE DRAWINGS

In fig. Figure 1 schematically shows a section of the head according to this utility model.

In fig. Figure 2 shows a photo of a sample product from the front, i.e. from the inlet side.

In fig. Figure 3 shows a photo of a sample product from the side (inlet pipe on the left, outlet pipe on the right).

In fig. Figure 4 shows a photo of a sample product from above. At the corners of the imaginary square, bosses with struts for attaching to the bracket are clearly visible.

In fig. Figure 5 shows a photo of a sample product from below. The central part (round in shape) and the stiffening ribs (diverging radially from the central to the peripheral part) are clearly visible.

In fig. Figure 6 shows a cross-section of the cover, the parameters of which were calculated using mathematical modeling.

In fig. Figure 7 presents a graph illustrating the optimal and suboptimal (shaded zones S ₁ and S ₂ ) locations of the filter cover dome section from the point of view of the relationship between strength and material consumption. The middle lines passing through the section of the dome of the lid, with an optimal ratio of strength and material consumption, should be monotonous lines located in an unshaded strip between the suboptimal zones S ₁ and S ₂ .

IMPLEMENTATION OF THE UTILITY MODEL

As shown in FIG. 1-5 shows a cap for a water filter flask containing:

lower part equipped with means of connection with the water filter flask,

an upper part having a convex wall, the outer and inner surfaces of which are at least partially formed by bodies of rotation,

characterized by the fact that it

the ratio S ₁ /S ₂ is from 0.5 to 0.37,

Where:

S ₁ - area of the part of square K located above the midline,

passing in the cross section of the said wall at an equal distance from the outer and inner surfaces of the wall,

S ₂ - the area of the part of the square K, located below the center line, located in the section of the mentioned wall at an equal distance from the outer and inner surfaces of the wall,

in this case, the square K lies in the secant plane, and its lower corner is located in the interface zone of the upper and lower parts of the cover at a distance R from its axis, and the upper one is on its axis, and

the cross-sectional shape of said wall is such that between the upper and lower lines formed at the intersection of the cutting plane with the outer and inner surfaces of said wall, a line with a radius of curvature varying in the range from 94% to 118% R can be inscribed.

During the study, the optimal ratios of the areas above and below the curve describing the middle line of the cut plane of the filter housing cover were established, where the area _S1 relates to S2, ranging from 0.5 to 0.37.

Most preferably, the area ratio S ₁ /S ₂ is 0.4 ± 0.1, and the top is spherical in shape with a radius of curvature at any point of 200 ± 3 mm.

The shape and dimensions of the filter housing cover were experimentally determined, which made it possible to achieve minimum material consumption and dimensions of the filter housing cover without reducing consumer qualities.

To determine the optimal ratio of S ₁ to S ₂ from the point of view of material consumption, mathematical modeling of the strength characteristics was carried out using the finite element method. The working load was taken to be a pressure of 8 bar applied to the inner edges of the cover shown in Fig. 6. The radius of the covers was 200 mm. All covers had a spherical surface without any kinks or local features. During the simulation, the wall thickness parameter (and, as a consequence, their mass) was varied in such a way as to ensure a safety margin of 1.0.

A strength index greater than 1.0 means that the product does not collapse when a work load is applied, and a strength index less than 1.0 means that the product can collapse when a work load is applied. The lower this indicator, the faster the destruction will occur under the same operating conditions.

The simulation results are summarized in Table 1.

As we can see, with values of S ₁ /S2 less than 0.37, at the same time as high material consumption, an excess safety margin is achieved, and with values above 0.5, material consumption is minimal, but the necessary safety margin is not provided. Thus, the optimal values for a given wall thickness are S ₁ /S ₂ in the range from 0.37 to 0.5, which simultaneously provide a safety margin above 1.0 and satisfactory material consumption.

Adding stiffeners allows you to further reduce the material consumption of the cover.

Claims (32)

1. A cover for a water filter flask, comprising a lower part equipped with means for connecting to the water filter flask, an upper part having a convex wall, the outer and inner surfaces of which are at least partially formed by bodies of rotation, characterized in that it the ratio S ₁ /S ₂ is from 0.5 to 0.37, where S ₁ is the area of the part of the square K located above the center line, passing in the section of the mentioned wall at an equal distance from the outer and inner surfaces of the wall; S ₂ - area of the part of the square K located below the center line, located in the section of the mentioned wall at an equal distance from the outer and inner surfaces of the wall in this case, the square K lies in the secant plane, and its lower corner is located in the junction zone of the upper and lower parts of the cover at a distance R from its axis, and the upper one is on its axis, and the cross-sectional shape of the said wall is such that between the upper and lower lines, formed at the intersection of the secant plane with the outer and inner surfaces of the said wall, a line with a radius of curvature varying in the range from 94% to 118% R can be inscribed. 2. The cover according to claim 1, in which the ratio S1/S2 is 0.4 ± 0.1, and the upper part has the shape of a hemisphere with a radius of 200 ± 3 mm. 3. A cover according to claim 1, characterized in that R is from 160 mm to 200 mm. 4. The lid according to claim 1, characterized in that said upper part has the shape of a spherical segment. 5. The lid according to claim 1, characterized in that said upper part has the shape of an ellipse or paraboloid segment. 6. The lid according to claim 1, characterized in that said upper and lower parts are made in one piece. 7. The cover according to claim 1, characterized in that its upper part is equipped with inlet and outlet pipes located horizontally. 8. The cover according to claim 5, characterized in that the above-mentioned nozzles are equipped with metal bushings with internal threads for connection to pipelines. 9. The cover according to any one of claims 7 or 8, characterized in that the above-mentioned nozzles have a thread, the distal part of which is formed by the helical line of the mentioned metal sleeve, and the proximal part by the helical line of the mentioned nozzles. 10. The lid according to claim 1, characterized in that the outer surface of said lower part is provided with projections for interaction with the unscrewing equipment. 11. The cover according to claim 1, characterized in that on its inner side in the interface between the said upper and lower parts there is an annular platform for placing a sealing ring. 12. The cover according to claim 1, characterized in that said connection means are threads located on the inner surface of said lower part. 13. A lid according to claim 1, characterized in that the wall thickness of said upper part is approximately 5-6 mm, and the wall thickness of the lower part is approximately 5 mm. 14. The cover according to claim 1, characterized in that the wall thickness in the area where the upper and lower parts meet is increased. 15. The lid according to claim 1, characterized in that said wall is provided with stiffeners having a distal end connected to said lower part, an upper end connected to said central part, and a middle part connected to said wall. 16. The cover according to claim 15, characterized in that it contains at least five said stiffeners, at least some of which are located at an equal distance from each other. 17. The cover according to claim 15, characterized in that said stiffening ribs form polygonal-shaped cells, preferably triangular, quadrangular, trapezoidal, pentagonal or hexagonal. 18. The cover according to claim 15, characterized in that the thickness or height of said stiffeners decreases from the periphery to the center or decreases as the distance between the ribs increases. 19. The cover according to claim 15, characterized in that said stiffening ribs are located on the inner side of the wall of said upper part. 20. The cover according to claim 15, characterized in that said stiffening ribs are located on the outer side of the wall of said upper part. 21. The cover according to claim 15, characterized in that said stiffening ribs are located on the upper and lower sides of the wall of said upper part. 22. The cover according to claim 15, characterized in that the said stiffening ribs are adjacent to the said wall along the entire length and are made integral with it. 23. The cover according to claim 15, characterized in that the said stiffeners are trapezoidal in cross section for ease of removal from the injection mold. 24. The cover according to claim 15, characterized in that the thickness of said stiffeners is at least 0.3 mm and the height is at least 1 mm. 25. The cover according to claim 1, characterized in that it contains at least two pipes. 26. The cover according to claim 25, characterized in that it contains a central part having channels communicating with at least one of the said pipes and with the internal cavity. 27. The cover according to claim 1, characterized in that it is additionally equipped with a closing hole for air release. 28. The cover according to claim 1, characterized in that it is made of plastic, preferably polypropylene.