Filter cloth fixing structure of filter

Abstract

The invention provides a filter cloth fixing structure of a filter, and relates to the technical field of filter parts, the filter cloth fixing structure comprises an upper cover, a locking cover and filter cloth, a boss is formed on the upper cover, a containing groove is formed in the boss, a limiting ring is sewn on the top of the filter cloth, the limiting ring is wrapped in the filter cloth, and the limiting ring is arranged in the containing groove in a sleeved mode. The limiting ring is sewn at the end part of the filter cloth, and the limiting ring is limited in the accommodating groove for mounting, so that the filter cloth is limited by limiting the limiting ring, the filter cloth body does not need to be pressed or extruded like the existing technical scheme, the damage to the filter cloth is avoided, the service life of the filter cloth is greatly prolonged, and the production cost is reduced. And the filter cloth can be fixed on the surface of the filter element for working for a longer time.

Description

Technical Field

[0001] The present invention relates to the field of filter parts, and particularly to a filter cloth fixing structure for a filter. Background Art

[0002] For filters, especially pressure filter filters, the filter cloth needs to be pulled tightly against the surface of the filter element to produce a filtering effect. Currently, there are only two fixing methods for the filter cloth of the filter element.

[0003] One method is to lay the filter cloth on the surface of the filter element and then use hoop clamps to fix the filter cloth on the filter element at both ends of the filter element, thereby completing the fixing of the filter element. However, this fixing method has always had problems verified by the market. The most prominent problem is that the position where the hoop clamp presses and fixes the filter cloth often cuts the filter cloth due to excessive pressure at the edge of the hoop clamp, greatly reducing the service life of the filter cloth. Even after many years of improvement on the hoop clamp, there is still no way to completely solve this problem.

[0004] The other method is to lay the filter cloth on the surface of the filter element and then press the filter cloth tightly inside the cover plate through threaded cover plates at both ends of the filter element. However, the cover plate needs to be connected to the filter element through threads, and the filter cloth needs to be fixed inside the cover plate. Therefore, inevitably, the filter cloth will be located at the threaded position. When the cover plate is connected to the filter element, the threads will cut the filter cloth, and the tighter it is pressed, the greater the possibility of cutting, which will also lead to a decrease in the service life of the filter cloth. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: the problem that the filter cloth cannot be stably and permanently fixed on the filter element in the prior art.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a filter cloth fixing structure for a filter, characterized in that: it includes an upper cover, a locking cover and a filter cloth. A boss is formed on the upper cover, and a receiving groove is opened on the boss. A limiting ring is sewn on the top of the filter cloth, the limiting ring is wrapped inside the filter cloth, the limiting ring is sleeved in the receiving groove, the locking cover is sleeved on the upper cover, the inner side surface of the locking cover is close to the outer side surface of the corresponding boss and forms a gap, the width of the gap is greater than or equal to the thickness of the filter cloth and less than the diameter of the limiting ring, and the inner side surface of the locking cover cooperates with the receiving groove to form a space for receiving the limiting ring.

[0007] In the technical solution of the present invention, the end of the filter cloth is sewn with a limiting ring, and the limiting ring is restricted to be installed in the receiving groove. In this way, the filter cloth is restricted by restricting the limiting ring, and there is no need to press or squeeze the filter cloth body as in the existing technical solutions, avoiding damage to the filter cloth, greatly extending the service life of the filter cloth, and enabling the filter cloth to be fixed on the surface of the filter element for a longer time to work.

[0008] Specifically, threads are provided on both the inner ring of the locking cover and the upper cover, and the locking cover is connected to the upper cover through the threads.

[0009] Preferably, a locking nut is further included. Threads are provided on both the inner ring of the locking nut and the upper cover, and the locking nut is connected to the upper cover through the threads.

[0010] Through the arrangement of the threads, it is ensured that the locking nut can be fixedly locked on the upper cover, avoiding the loosening of the filter cloth fixing structure.

[0011] Specifically, a stepped hole is provided on the locking nut, and a threaded hole is provided on the locking cover corresponding to the position of the stepped hole. The locking nut and the locking cover are fixedly connected by bolts.

[0012] Through the arrangement of the stepped hole on the locking nut and the threaded hole on the locking cover, when installing, the bolt is passed through the stepped hole and locked on the threaded hole. Firstly, this can further fix the locking cover and prevent it from moving easily. Secondly, it can relatively fix the locking nut and the locking cover, avoiding the loosening and falling off of a single part.

[0013] Preferably, a groove is provided on the locking nut in the axial direction relative to the stepped hole.

[0014] Through the arrangement of the groove, when using bolts to fix the locking nut and the locking cover, the groove on the locking nut can provide a certain amount of elastic deformation, ensuring that the bolts are locked more firmly.

[0015] Specifically, the receiving groove divides the boss into a first table surface and a second table surface. The first table surface has a smooth transition, the second table surface forms a side arc shape, the highest point on the side of the second table surface has a smooth transition and forms a 5° angle with the vertical direction, and the surface roughness of the side of the second table surface is less than 0.5.

[0016] Through the arrangement of the second table surface, it is avoided that the filter cloth is cut when the filter cloth slides relative to the second table surface on the second table surface, ensuring that the filter cloth is not damaged during operation, especially during the backwashing process, and further improving the service life of the filter cloth. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the drawings and embodiments.

[0018] Figure 1 is the main view full cross-sectional view of a filter cloth fixing structure proposed by the present invention; Figure 2 is the full cross-sectional view of the upper cover; Figure 3 is Figure 2 the partial view at position A in Figure 4 is the full cross-sectional view of the locking cover and the locking nut; Figure 5 Full sectional view of the upper cover, locking cover and filter cloth.

[0019] Legend: 1 Upper cover, 2 Locking cover, 3 Filter cloth, 4 Boss, 5 Receiving groove, 6 Limiting ring, 7 Locking nut, 8 Step hole, 9 Threaded hole, 10 Groove, 41 First table surface, 42 Second table surface. Specific implementation mode

[0020] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only schematically showing the basic structure of the present invention, so they only show the components related to the present invention.

[0021] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0022] The fixing structure of the filter cloth 3 of the filter, characterized in that: it includes an upper cover 1, a locking cover 2 and a filter cloth 3. A boss 4 is formed on the upper cover 1, a receiving groove 5 is opened on the boss 4, a limiting ring 6 is sewn on the top of the filter cloth 3, the limiting ring 6 is wrapped inside the filter cloth 3, the limiting ring 6 is sleeved in the receiving groove 5, the locking cover 2 is sleeved on the upper cover 1, the inner side surface of the locking cover 2 is close to the outer side surface of the boss 4 and a gap is formed, the width of the gap is greater than or equal to the thickness of the filter cloth 3 and less than the diameter of the limiting ring 6, and the inner side surface of the locking cover 2 and the receiving groove 5 cooperate to form a space for receiving the limiting ring 6.

[0023] In the technical solution of the present invention, by sewing the limiting ring 6 at the end of the filter cloth 3 and restricting the limiting ring 6 in the receiving groove 5 for installation, the filter cloth 3 is restricted by restricting the limiting ring 6, so there is no need to press or squeeze the filter cloth 3 body like the existing technical solutions, avoiding damage to the filter cloth 3 and greatly extending the service life of the filter cloth 3, so that the filter cloth 3 can be fixed on the surface of the filter element for a longer time to work. In practice, the limiting ring 6 is an O-ring. The filter cloth 3 sews the O-ring inside both ends of the filter cloth 3 through hemming sewing. The advantage of this is that the entire edge of the filter cloth 3 is stressed simultaneously. It is almost impossible for the stressed edge of a whole circle to cause the sewing of the filter cloth 3 to come off, because the axial tension of the filter cloth 3 itself is not very large during actual use. The maximum situation is when the filter cloth 3 is backflushed, but the backflushing force cannot cause the O-ring to burst open the sewing position of the filter cloth 3. The applicant has also tried clamping, gluing, and heat ironing. Finally, the sewing technical solution is selected, which has high efficiency, extremely low cost, and can be reworked and repaired.

[0024] One possible way is that threads are provided on both the inner ring of the locking cover 2 and the upper cover 1, and the locking cover 2 is connected to the upper cover 1 through the threads.

[0025] Of course, the technical solution actually adopted is that of the locking nut 7. After the locking cover 2 and the upper cover 1 are connected by threads, vibration loosening and reverse rotation may occur, which is not particularly stable. Therefore, the applicant actually adopts the solution that threads are provided on both the inner ring of the locking nut 7 and the upper cover 1, and the locking nut 7 is connected to the upper cover 1 through the threads. Through the setting of the threads, it is ensured that the locking nut 7 can be fixedly locked on the upper cover 1, avoiding the loosening of the fixing structure of the filter cloth 3.

[0026] To further ensure stability, a stepped hole 8 is provided on the locking nut 7, and a threaded hole 9 is provided at the position of the locking cover 2 corresponding to the stepped hole 8. The locking nut 7 and the locking cover 2 are fixedly connected by bolts. Through the setting of the stepped hole 8 on the locking nut 7 and the threaded hole 9 on the locking cover 2, when installing, the bolt is passed through the stepped hole 8 and locked on the threaded hole 9. In this way, firstly, the locking cover 2 can be further fixedly locked so that it will not move easily. Secondly, the locking nut 7 and the locking cover 2 can be relatively fixed to avoid the loosening and falling off of a single part.

[0027] What is most special in this solution is that a groove 10 is provided on the locking nut 7 in the axial direction opposite to the stepped hole 8. Through the setting of the groove 10, when using a bolt to fix the locking nut 7 and the locking cover 2, the groove 10 on the locking nut 7 can provide a certain amount of elastic deformation, ensuring that the bolt is locked more firmly. At the same time, the use of an elastic gasket is avoided. Using an elastic gasket increases the installation process (one more step during installation, and one more inspection process during quality inspection). On the other hand, if the liquid in the filter causes the gasket to crack or loosen, the entire filter needs to be emptied and repaired, which is costly. In this application, the setting of the groove 10 can avoid using an elastic gasket and at the same time achieve the effect of an elastic gasket. On the other hand, it can also reduce the overall weight of the locking nut 7.

[0028] Due to the provision of the receiving groove 5, the receiving groove 5 splits the boss 4 into a first table surface 41 and a second table surface 42. The first table surface 41 has a smooth transition. The first table surface 41 only needs to be in close contact with the locking cover 2 at the top, and a high level of craftsmanship is not required. The second table surface 42 forms a side arc shape. The highest point on the side of the second table surface 42 has a smooth transition and forms an angle of 5° with the vertical direction, and the surface roughness of the side of the second table surface 42 is less than 0.5.

[0029] Through the setting of the second table surface 42, it is avoided that the filter cloth 3 is cut when the filter cloth 3 slides relative to the second table surface 42 on the second table surface 42, ensuring that the filter cloth 3 is not damaged during the operation process, especially during the backwashing process, and further improving the service life of the filter cloth 3.

[0030] With the angle solution determined in this solution, the damage to the filter cloth 3 during actual testing is smaller. Secondly, the smooth 5° downward transition allows the filter cloth 3 to have a larger swing space to cope with the pressure on the filter cloth 3 caused by normal filtration and backwashing.

[0031] The above are only the preferred embodiments of the present invention, and do not limit the present invention in other forms. Any person skilled in the art may use the technical content disclosed above to make changes or equivalent changes to equivalent embodiments and apply them to other fields. However, as long as it does not depart from the technical solution content of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still belong to the protection scope of the technical solution of the present invention. In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

Claims

1. Filter cloth fixing structure of filter, characterized in that: It includes an upper cover, a locking cover and a filter cloth. A boss is formed on the upper cover, and a receiving groove is provided in the boss. A limiting ring is sewn at the top of the filter cloth. The limiting ring is wrapped inside the filter cloth and sleeved in the receiving groove. The locking cover is sleeved on the upper cover. The inner side surface of the locking cover is close to the outer side surface of the boss and forms a gap. The width of the gap is greater than or equal to the thickness of the filter cloth and less than the diameter of the limiting ring. The inner side surface of the locking cover and the receiving groove cooperate to form a space for receiving the limiting ring.

2. The filter cloth fixing structure according to claim 1, wherein, Threads are provided on both the inner ring of the locking cover and the upper cover, and the locking cover is connected to the upper cover through the threads.

3. The filter cloth fixing structure according to claim 1, characterized in that It further includes a locking nut. Threads are provided on both the inner ring of the locking nut and the upper cover, and the locking nut is connected to the upper cover through the threads.

4. The filter cloth fixing structure according to claim 3, characterized in that A stepped hole is provided in the locking nut, and a threaded hole is provided in the locking cover corresponding to the stepped hole. The locking nut is fixedly connected to the locking cover by bolts.

5. The filter cloth fixing structure according to claim 4, characterized in that, A groove is provided in the locking nut in the axial direction opposite to the stepped hole.

6. The filter cloth fixing structure according to claim 1, characterized in that, The receiving groove divides the boss into a first table surface and a second table surface. The first table surface has a smooth transition. The second table surface has a side arc shape. The highest point on the side of the second table surface has a smooth transition and forms an angle of 5° with the vertical direction, and the surface roughness of the side of the second table surface is less than 0.5.

Images