Filter element framework and end cover welding structure and welding quality detection structure

Abstract

The utility model relates to the technical field of filter element production, in particular to a filter element framework and end cover welding structure which comprises a plurality of notches arranged at the end of a framework and distributed along the circumference of the framework, adjacent notches enclose to form teeth, the teeth are used for being bonded with the end cover after hot melting, and the notches are suitable for overflowing and filling of hot melting soft materials. The welding quality detection structure comprises the waterproof film, the waterproof film and the non-woven fabric are stacked and then wound around the end of the framework, the end, close to the end cover, of the waterproof film extends out of the end of the non-woven fabric and is connected to the framework in a hot melting mode, and the end, away from the end cover, of the waterproof film extends to the position where the permeable function of the filter element is not affected. The waterproof film is used for resisting water when the framework is inserted into water to detect whether water infiltrates inwards at the welding position or not. A circle of tooth shape is made at the contact position of the framework and the end cover, molten soft materials of the framework and the end cover enter gaps between adjacent teeth under the action of extrusion force and are solidified, the soft materials extruded to the edge are reduced, and the soft materials are prevented from being far away from a hot plate and cooled to become low-temperature soft materials to participate in welding.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter core production technical field especially, and it is a kind of filter core framework and end cover welding structure and welding quality detection structure. BACKGROUND

[0002] At present, when the filter core made of microporous membrane material is produced, the filter core framework of barrel shape is welded and fixed with end cover by hot plate welding process.The principle of hot plate welding is roughly as follows: framework hot plate and end cover hot plate heat corresponding parts to melt, then the framework and end cover are directly pressed together, after reaching welding depth and welding time, the welding position is cooled, then the product is obtained, in which the framework is embedded into the end cover.No-woven fabric after surface treatment is wound on the framework, then the complete filter core is obtained.

[0003] At present, in the welding process of framework and end cover, there are extrusion force and temperature, which leads to the following problems: the framework and end cover melt and become soft, the soft material is extruded to the edge under the action of force, then it is cooled because it is far away from the hot plate, finally, when the end cover and the framework contact, more is the contact of low-temperature soft material, which leads to poor welding quality. INVENTION CONTENTS

[0004] Therefore, the utility model provides a filter core framework and end cover welding structure to solve the problem of poor welding quality caused by low-temperature soft material contact when welding framework and end cover.

[0005] The utility model provides a filter core framework and end cover welding structure, which comprises a plurality of notches arranged on the end part of the framework and distributed along the circumference of the framework, adjacent notches form a tooth, the tooth is used for bonding with the end cover after hot melting, and the notches are suitable for overflow filling of hot-melt soft material.

[0006] Optionally, the tooth is sawtooth-shaped.

[0007] Optionally, the tooth is rectangular.

[0008] Optionally, the tooth is trapezoidal.

[0009] Optionally, the tooth is arc-shaped.

[0010] Optionally, the thickness of the tooth gradually thins from the root to the tip.

[0011] Optionally, the outer side wall of the tooth is provided with a first slope, the lowest end of the first slope is connected with the outer side wall of the framework, and the highest end of the first slope is connected with the inner side wall of the framework.

[0012] Optionally, the inner side wall of the tooth is provided with a second slope, the lowest end of the second slope is connected with the inner side wall of the framework, and the highest end of the first slope is connected with the outer side wall of the framework.

[0013] Optionally, the outer side wall of the tooth is provided with a first slope, and the inner side wall is provided with a second slope, the highest end of the first slope and the highest end of the second slope are connected to the top end of the tooth, the lowest end of the first slope is connected to the outer side wall of the framework, and the lowest end of the second slope is connected to the inner side wall of the framework.

[0014] Another purpose of the utility model is to provide a filter core framework and end cover welding quality detection structure, according to the filter core framework and end cover welding structure, the welding quality detection structure includes water impermeable film, the water impermeable film is laminated with non-woven fabric and is wound on the end of the framework, one end of the water impermeable film near the end cover is stretched out of the end of non-woven fabric and is hot melt connected on the framework, one end of the water impermeable film away from the end cover is extended to the position that does not affect the water permeability of the filter core, and the water impermeable film is used for water isolation when the framework is inserted into water to detect whether the welding position is inwardly water permeable.

[0015] The technical scheme of the utility model has the following advantages:

[0016] 1. A tooth shape is made at the contact part of the framework and the end cover, and the soft material melted by the framework and the end cover enters the gap between the adjacent teeth under the action of extrusion force and solidifies, thereby reducing the amount of soft material extruded to the edge and avoiding that the soft material is cooled to low-temperature soft material far from the hot plate to participate in welding.

[0017] 2. The contact part of the framework and the end cover is made into a slope shape, compared with the tooth without slope, the slope makes the amount of soft material formed after the tooth tip is melted to be less, and the amount of soft material gradually increases as gradually melting to the tooth root, thereby further reducing the overflow amount of soft material.

[0018] 3. The water impermeable film is wrapped together with non-woven fabric at the end part of the framework, the water impermeable film seals a section of non-woven fabric and a section of framework of the filter core to make them unable to permeate water, the filter core is inserted into water and the water level is lower than the water impermeable film, and if water is observed in the filter core after a period of time, it is determined that the framework and the end cover welding position leaks, that is, the welding quality is unqualified. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as the limitation to the scope, and for the ordinary skilled person in the art, other related drawings can also be obtained according to these drawings without the creative labor.

[0020] Figure 1 It is the structure schematic view of the framework and the end cover in the embodiment.

[0021] Figure 2 It is the first form of slope structure schematic view in the embodiment.

[0022] Figure 3 is a schematic view of a ramp structure in a second form of embodiment.

[0023] Figure 4 is a schematic view of a ramp structure in a third form of embodiment.

[0024] Figure 5 is a schematic view of a filter core framework and end cap welding quality detection structure in an embodiment.

[0025] Figure 6 is a top view of non-woven fabric and water-impermeable film during unwinding in an embodiment.

[0026] In the figure: framework 1, notch 11, tooth 12, first ramp 121, second ramp 122, end cap 2, water-impermeable film 3, non-woven fabric 4, water tank 5. DETAILED DESCRIPTION

[0027] The specific embodiments of the present application will be described below in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the description of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0028] Unless otherwise explicitly specified and limited, the terms "arranged", "mounted", "connected" and the like should be interpreted in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium. Those of ordinary skill in the art can understand the specific meanings of the above terms according to the specific circumstances.

[0029] The terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, and are only for the convenience of description and simplification of description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0030] The terms "first", "second", "third" and the like are only used to distinguish similar attributes of elements, and do not indicate or imply relative importance or a specific order.

[0031] The terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, in addition to including the listed elements, other elements not explicitly listed can also be included.

[0032] With reference to Figure 1 The utility model embodiment provides a filter core framework and end cover welding structure, including multiple notches 11 of being located in the framework 1 length direction both ends, the notch 11 of each end of framework 1 along the uniform distribution of framework 1 periphery interval, adjacent notch 11 surrounds tooth 12. Framework 1 and end cover 2 weld, framework hot plate will tooth 12 hot melt and form soft material, end cover hot plate will the end face hot melt of end cover 2 and form soft material, then the tooth 12 of one circle of framework 1 end is pressed on the end face of end cover 2, the hot melt soft material of both of framework 1 and end cover 2 mutually adheres, realizes the tooth 12 inbedding of framework 1 after cooling into end cover 2, namely completes welding. Because adjacent tooth 12 between has the notch 11 for hot melt soft material overflow filling, thus reduced the soft material amount of overflow to edge ( away from hot plate place), numerous notches 11 also reduced the amount of hot melt of framework 1, namely reduced the soft material amount of formation, also can reduce soft material overflow amount.

[0033] The utility model embodiment makes a circle of tooth shape at the place where the framework 1 and the end cover 2 contact, and the soft material melted by the framework 1 and the end cover 2 enters the notch 11 between the adjacent teeth 12 under the action of extrusion force and solidifies, so that the amount of soft material extruded to the edge is reduced, and the soft material far away from the hot plate is prevented from cooling to become low-temperature soft material to participate in welding, thereby avoiding the decline of welding quality.

[0034] Further, the shape of the tooth 12 can be sawtooth-shaped, rectangular, trapezoidal or arc-shaped; the teeth 12 at both ends of the framework 1 can be of the same tooth shape, for example, all sawtooth-shaped; the teeth 12 at both ends of the framework 1 can be of different tooth shapes, for example, the teeth 12 at one end of the framework 1 are all sawtooth-shaped, and the teeth 12 at the other end are all rectangular; the teeth 12 at the same end of the framework 1 can be of different tooth shapes, for example, among the teeth 12 at the same end of the framework 1, some teeth 12 are sawtooth-shaped, and some teeth 12 are trapezoidal, and the types of tooth shapes are at least two. In the embodiment, the teeth 12 at both ends of the framework 1 are preferably all sawtooth-shaped, and the sawtooth-shaped teeth 12 can increase the amount of soft material in a nearly linear manner during the uniform movement of the framework 1 being pressed toward the end cover 2, so that the moving speed of the framework 1 can be slowed down when it is observed that the soft material has a tendency to overflow at a high speed, thereby avoiding a large amount of soft material from overflowing.

[0035] Further, the thickness of the tooth 12 gradually decreases from the tooth root to the tooth tip. By making the place where the framework 1 and the end cover 2 contact into a slope shape, compared with the tooth 12 without a slope, the slope makes the amount of soft material formed after the tooth tip melts less, and the amount of soft material gradually increases as it gradually melts to the tooth root, thereby further reducing the amount of soft material overflow. With reference to Figure 2 Specifically, in the embodiment, the outer side wall of the tooth 12 is provided with a first slope 121, the lowest end of the first slope 121 is connected with the outer side wall of the framework 1, and the highest end of the first slope 121 is connected with the inner side wall of the framework 1.

[0036] With reference toFigure 3 In other embodiments, the form of the gradually thinning thickness of the tooth 12 from the tooth root to the tooth tip is that the inner side wall of the tooth 12 is provided with a second slope 122, the lowest end of the second slope 122 is connected to the inner side wall of the framework 1, and the highest end of the second slope 122 is connected to the outer side wall of the framework 1.

[0037] In other embodiments, the form of the gradually thinning thickness of the tooth 12 from the tooth root to the tooth tip is that the inner side wall of the tooth 12 is provided with a second slope 122, the lowest end of the second slope 122 is connected to the inner side wall of the framework 1, and the highest end of the second slope 122 is connected to the outer side wall of the framework 1.

[0038] In addition, in terms of process, when the framework 1 continuously extrudes the tooth 12 into the soft material of the end cover 2, the heating is stopped when the bottom of the tooth 12 is reached, achieving that the bottom of the tooth 12 is both heated and does not overflow, so that the bottom of the tooth maintains a good melting degree and structure, which is beneficial to welding.

[0039] In addition, based on the above-mentioned filter core framework and end cover welding structure, the present embodiment also relates to a filter core framework and end cover welding quality detection structure. The welding quality detection structure comprises a water-impermeable film 3, which is wound on the end of the framework 1 after being laminated with the non-woven fabric. The end of the water-impermeable film 3 close to the end cover 2 extends out of the end of the non-woven fabric and is hot-melt connected to the framework 1. The end of the water-impermeable film 3 away from the end cover 2 extends to a position that does not affect the water permeability of the filter core (the height along the axis of the framework 1 is generally about 5 cm, and it is required that it cannot cover a large area of holes on the framework 1). The water-impermeable film 3 is used to prevent water from penetrating in when the framework 1 is inserted into water to detect whether the welding position leaks.

[0040] Please refer to Figure 5 The water-impermeable film 3 is wrapped on the end of the framework 1 together with the non-woven fabric 4 by clamping. The water-impermeable film 3 seals a section of the non-woven fabric 4 and a section of the framework 1 to make them impermeable to water. The filter core is inserted into a water tank 5 with the water level being lower than the water-impermeable film 3 and higher than the welding position. After a period of time, if water is observed to enter the filter core, it is determined that the welding position of the framework 1 and the end cover 2 leaks, that is, the welding quality is unqualified.

[0041] The framework 1 has many holes, which ensure that after the non-woven fabric 4 is wound on the framework 1, liquid can pass through the non-woven fabric 4 and the holes on the framework 1 into the interior of the framework 1. The porous structure of the framework 1, combined with the good air permeability of the non-woven fabric 4, makes it impossible to detect the bonding condition of the end of the framework 1 and the end cover 2 by gas method. There are other methods for detection, but they are time-consuming and laborious. The water-impermeable film 3 is wrapped on the two ends of the framework 1 by clamping with the non-woven fabric 4, which is fast in detection speed and low in cost.

[0042] Please refer toFigure 6 When the filter core is produced, in the process of winding the non-woven fabric 4, one water-impermeable film 3 is attached to each end of the non-woven fabric 4 in the width direction, the length of the water-impermeable film 3 extends along the length direction of the non-woven fabric 4, and the water-impermeable film 3 has the same number of winding turns on the skeleton 1 as the non-woven fabric 4; the side end of the water-impermeable film 3 slightly extends from the side end of the non-woven fabric 4 by a certain distance, and the effect of winding on the skeleton 1 is as follows: please refer to Figure 5 The one end of the water-impermeable film 3 close to the end cover 2 extends from the non-woven fabric 4, the extended end of the water-impermeable film 3 is heated to make the multiple films adhere to each other and be fixed on the side wall of the skeleton 1, and the sealed connection of the water-impermeable film 3 and the skeleton 1 is realized.

[0043] In the embodiment, the thickness of the water-impermeable film 3 is 0.1-0.5mm, the height along the axial direction of the skeleton 1 is 3-5cm, and the end cover 2, the skeleton 1 and the water-impermeable film 3 preferably adopt the same material.

[0044] In summary, the technical scheme of the utility model has the following advantages:

[0045] 1. The overflow (glue refers to molten soft material) during the welding of the skeleton 1 and the end cover 2 is reduced, and even no overflow can be realized, the flash formed by the overflow is avoided to protrude to the peripheral side wall of the end cover 2, the installation of the sealing ring on the peripheral side wall of the end cover 2 is affected, and the normal insertion of the filter core into the cup seat of the equipment is affected;

[0046] 2. The gap 11 between the adjacent teeth 12 and the slope on the tooth 12 make the molten material be less extruded, so that the fusion of the skeleton 1 and the end cover 2 is better realized;

[0047] 3. The water-impermeable film 3 is used for bottoming, the molten soft material of the film after heating can not only adhere to the non-woven fabric 4 but also be fixed on the wall of the skeleton 1, and the firm adhesion of multiple materials is realized;

[0048] 4. The water-impermeable film 3 is used for bottoming, and the quality of the welding is facilitated to be inspected.

[0049] The above is only a specific implementation manner of the utility model, but the protection scope of the utility model is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A filter element frame and end cap welded structure, characterized in that, It includes multiple notches located at the ends of the skeleton and distributed circumferentially along the skeleton. Adjacent notches form teeth, which are used to bond with the end cap after hot melting. The notches are suitable for hot-melt soft material to overflow and fill.

2. The filter element frame and end cap welding structure according to claim 1, characterized in that, The teeth are serrated.

3. The filter element frame and end cap welding structure according to claim 1, characterized in that, The teeth are rectangular.

4. The filter element frame and end cap welding structure according to claim 1, characterized in that, The teeth are trapezoidal.

5. The filter element frame and end cap welding structure according to claim 1, characterized in that, The teeth are arc-shaped.

6. The filter element frame and end cap welding structure according to any one of claims 2-5, characterized in that, The thickness of the tooth gradually decreases from the root to the tip.

7. The filter element frame and end cap welding structure according to claim 6, characterized in that, The outer wall of the tooth is provided with a first slope, the lowest end of the first slope is connected to the outer wall of the skeleton, and the highest end of the first slope is connected to the inner wall of the skeleton.

8. The filter element frame and end cap welding structure according to claim 7, characterized in that, The inner wall of the tooth is provided with a second slope, the lowest end of the second slope is connected to the inner wall of the skeleton, and the highest end of the first slope is connected to the outer wall of the skeleton.

9. The filter element frame and end cap welding structure according to claim 6, characterized in that, The tooth has a first slope on its outer side wall and a second slope on its inner side wall. The highest point of the first slope and the highest point of the second slope are connected to the top of the tooth. The lowest point of the first slope is connected to the outer side wall of the skeleton, and the lowest point of the second slope is connected to the inner side wall of the skeleton.

10. A welding quality inspection structure for the filter element frame and end cap, as described in any one of claims 1-9, characterized in that, The welding quality inspection structure includes a waterproof membrane, which is layered with non-woven fabric and then wound around the end of the frame. One end of the waterproof membrane near the end cap extends out of the end of the non-woven fabric and is heat-fused to the frame. The other end of the waterproof membrane away from the end cap extends to a position that does not affect the water permeability of the filter element. The waterproof membrane is used to block water when the frame is inserted into water to detect whether the weld is leaking inward.

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