A large-flow filter element

Abstract

The present invention relates to a large flow filter element, comprising a filter element body, a filter element top cover arranged on the top of the filter element body and a filter element bottom cover arranged on the bottom of the filter element body, the filter element body is wrapped with a circle of cylindrical filter screen cylinder, the filter screen cylinder is a woven structure, and comprises a plurality of vertical support bars and transverse support bars, any two adjacent vertical support bars are wound through the transverse support bars to form a woven unit and form a accommodating space; the ends of the vertical support bars are bent to form an insertion section inserted into the accommodating space; the bending part of the vertical support bars forms an arc-shaped protrusion; the ends of the transverse support bars are inserted into the accommodating space. The purpose to be achieved by the present invention is to provide a large flow filter element with a simple structure, reliable strength and no damage to the filter membrane during the assembly of the filter screen cylinder.

Description

Technical Field

[0001] The present invention relates to a filter element for filtration, in particular to a large-flow filter element. Background Art

[0002] In the prior art, a filtration device is required during fluid filtration, and the core component that plays a filtration role in the filtration device is the filter element. The filter element generally includes a filter element body, a filter element top cover provided at the top of the filter element body, and a filter element bottom cover provided at the bottom of the filter element body. A filter membrane for filtration is provided on the filter element body. The filter element as a whole is arranged in a hollow cylindrical shape, with one end of the top cover or the bottom cover open and the other end closed. The fluid to be filtered can penetrate the filter membrane from the outer surface of the filter element body to the middle of the filter element body, and then flow out from the open top cover or bottom cover (i.e., in from the outside and out from the inside) to complete filtration; it can also flow in from the open top cover or bottom cover of the filter element and flow out from the outer surface of the filter element body through the filter membrane (i.e., in from the inside and out from the outside) to complete filtration.

[0003] In actual applications, it is necessary to select the filtration method of in from the inside and out from the outside or in from the outside and out from the inside according to different filtration pressures, different filtration flows, etc. Since in large-flow filtration, the flow rate and pressure of the fluid are large. If the filtration method of in from the outside and out from the inside is selected, the fluid is likely to cause a large impact on the filter membrane when passing through the surface of the filter membrane. Especially at the beginning of filtration, it is easy to damage the surface structure of the filter membrane, affecting the filtration effect and the overall service life of the filter element. Therefore, in the actual application of large-flow filtration, the filtration method of in from the inside and out from the outside is often adopted. At the same time, in order to prevent the fluid from taking out the filter membrane or damaging the structure of the filter membrane when rushing out of the outer surface of the filter element body due to excessive pressure and flow rate, a cylindrical filter screen tube is further provided outside the filter element body. The setting of the filter screen tube here can, to a certain extent, limit and protect the filter membrane on the filter element body, protecting it from being damaged in structure by the impact of large-flow and high-pressure fluid.

[0004] In the actual process of manufacturing and assembling the filter element, the filter mesh cylinder needs to be sleeved outside the filter element body. During the sleeving process, it is inevitable that the top of the filter mesh cylinder will touch and rub the filter membrane on the outer surface of the filter element body. Also, in the existing technology, the filter mesh cylinder is only a simple mesh structure and there is no special setting at its end. Therefore, there will be some relatively abrupt ends. The existence of these ends makes it easy to scratch the surface of the filter membrane when installing the filter mesh cylinder, damaging its structure and affecting the use effect and service life of the overall filter element. At the same time, in the existing technology, the ends of the filter mesh cylinder are either hot-melted or simply ligated, or no setting is made for the abrupt ends. This obviously cannot avoid damaging the filter membrane during the installation of the filter mesh cylinder. At the same time, if hot-melting is used, it will increase the complexity of the process during the production of the filter mesh cylinder, increase costs and time, and cannot solve the above problems well; if ligation is performed at the ends, the abrupt part formed after ligation cannot be eliminated to damage the filter membrane during assembly either. Summary of the Invention

[0005] The object to be achieved by the present invention is to provide a large-flow filter element with a simple structure, reliable strength and that will not damage the filter membrane during the assembly process of the filter mesh cylinder.

[0006] To achieve the above object, the present invention adopts the following technical solution: A large-flow filter element includes a filter element body, a filter element top cover provided at the top of the filter element body, and a filter element bottom cover provided at the bottom of the filter element body. A cylindrical filter mesh cylinder is wrapped around the outside of the filter element body. The filter mesh cylinder has a woven structure and includes a plurality of vertical support bars and horizontal support bars. Any two adjacent vertical support bars are wound by the horizontal support bars to form a weaving unit and form an accommodation space; the end of the vertical support bar is bent to form an insertion section and inserted into the accommodation space; an arc-shaped protrusion is formed at the bending part of the vertical support bar; the end of the horizontal support bar is inserted into the accommodation space.

[0007] Further, the end of the horizontal support bar is bent.

[0008] Further, the insertion depth of the insertion section of the vertical support bar is set between 0.5 cm and 10 cm, and the insertion depth of the end of the horizontal support bar into the accommodation space is set between 0.5 cm and 10 cm.

[0009] Further, the horizontal support bar is wound in an O shape or an 8 shape or a mixed winding of O shape and 8 shape.

[0010] Further, for the horizontal support bar closest to the end of the vertical support bar, the side where it is wound and attached to the vertical support bar is the bending direction of the end of the vertical support bar.

[0011] Further, the adjacent weaving units share a vertical support bar, and the horizontal support bars of the adjacent weaving units are arranged alternately on the shared vertical support bar.

[0012] Further, the adjacent horizontal support bars wound around the vertical support bar are closely attached to each other.

[0013] Further, the ratio between the diameter d1 of the vertical support bar and the diameter d2 of the horizontal support bar satisfies: 0.5 < d1:d2 < 2.

[0014] Further, the ratio between the width L of the single weaving unit and the diameter d1 of the vertical support bar satisfies: 2 < L:d1 < 10.

[0015] Further, the angle α between the horizontal support bar and the horizontal plane is set between 0° - 30°.

[0016] The solution in the present invention has the following advantages compared with the prior art: 1. During the installation process, it reduces or even does not damage the surface of the filter membrane. 2. The filter screen cylinder can ensure a certain support strength and is applicable to usage scenarios with greater pressure and greater flow rate. 3. During the production process of the filter screen cylinder, the process is simple without adding extra steps and without increasing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings:

[0018] Figure 1 It is a schematic structural diagram of a large-flow filter element of the present invention;

[0019] Figure 2 It is a schematic diagram of the end parts of the horizontal support bar and the vertical support bar;

[0020] Figure 3 It is a front view schematic diagram of the end O-shaped winding structure of the filter screen cylinder in the present invention;

[0021] Figure 4 It is a top view schematic diagram of the end O-shaped winding structure of the filter screen cylinder in the present invention;

[0022] Figure 5 It is a top view schematic diagram of the filter screen cylinder in an 8-shaped winding structure;

[0023] Figure 6 It is a schematic diagram of the winding of the filter screen cylinder Figure 1 ;

[0024] Figure 7 It is a schematic diagram of the winding of the filter screen cylinder Figure 2 ;

[0025] Figure 8 It is a schematic diagram of the winding of the filter screen cylinderFigure 3 ;

[0026] Figure 9 Schematic of the winding of the filter screen cylinder Figure 4 .

[0027] In the figure: 1. Filter element top cover; 11. Handle; 12. Through hole; 2. Filter element bottom cover; 3. Filter screen cylinder; 31. Vertical support bar; 311. Arc-shaped protrusion; 312. Insertion section; 32. Horizontal support bar; 33. Accommodating space. Specific implementation manners

[0028] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0029] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0030] As Figure 1 , Figure 3 and Figure 4 shown, a large-flow filter element includes a filter element main body, a filter element top cover 1 provided at the top of the filter element main body, and a filter element bottom cover 2 provided at the bottom of the filter element main body. The filter element bottom cover 2 is a sealing cover to prevent the fluid from flowing out from the hollow bottom of the filter element main body; a through hole 12 is provided in the middle of the filter element top cover 1 to facilitate the introduction of the fluid into the hollow part of the filter element, so that the fluid to be filtered penetrates the filter membrane of the filter element from the inside to the outside under the action of pressure to the outer surface of the filter element main body, thereby realizing the filtering function; a handle 11 is further provided on the outer surface of the top of the filter element top cover 1 to facilitate the installation and disassembly of the filter element. A cylindrical and woven filter screen cylinder 3 is wrapped around the outer surface of the filter element main body to ensure that when the filtrate with large flow and large pressure rushes out from the outer surface of the filter element main body from the inside to the outside during the filtering process, it will not incidentally impact the filter membrane and cause damage, playing a role in limiting and protecting the filter membrane. In the accompanying drawings, since the position of the filter screen cylinder 3 blocks the filter element main body and the filter membrane on the filter element main body, there is no related schematic of the filter element main body and the filter membrane in the accompanying drawings.

[0031] In this embodiment, the specific weaving structure of the filter screen cylinder 3 is as Figure 3 and Figure 4As shown in the figure. The entire filter screen cylinder 3 includes a number of vertical support bars 31 and a number of horizontal support bars 32. Between two adjacent vertical support bars 31, a horizontal support bar 32 is wound in a bottom-up or top-down direction to form a weaving unit, and an accommodation space 33 is formed between the two adjacent vertical support bars 31 and the horizontal support bar 32. Specifically, the winding method of the horizontal support bar 32 is selected as the O-shaped winding, but it is not limited to the O-shaped winding. It can also be the 8-shaped winding or the mixed winding of the O-shaped and 8-shaped. The 8-shaped winding specifically means that the horizontal support bar 32 is wound in a way that has a certain intersection between two adjacent vertical support bars 31. From a top-down view, the distribution of the horizontal support bar 32 presents an 8-shaped, as Figure 4 shown. The mixed winding of the O-shaped and 8-shaped means that some of the horizontal support bars 32 are wound in the O-shaped, and some of the horizontal support bars 32 are wound in the 8-shaped. It can be clearly seen from the figure that at the ends of the filter screen cylinder 3 close to the filter element top cover 1 and the filter screen cylinder 3 close to the filter element bottom cover 2, the vertical support bars 31 are bent and an insertion section 312 is formed to insert into the accommodation space 33. At the same time, an arc-shaped protrusion 311 is formed at the bent part. At both ends of the horizontal support bar 32, they are also bent and inserted into the accommodation space 33 to prevent the top or bottom of the filter screen cylinder 3 from forming a protruding tip outward, which may damage the filter membrane structure on the filter element body during the installation of the filter screen cylinder 3. Further, a certain limitation is made on the way the horizontal support bar 32 is inserted into the accommodation space 33. The horizontal support bar 32 is wound around the surface of the insertion section 312 of the vertical support bar 31 and inserted into the accommodation space 33. This increases the friction between the horizontal support bar 32 and the vertical support bar 31, and to a certain extent, it plays a role similar to tying a knot, so that the integrally woven filter screen cylinder 3 will not easily come apart and can also ensure the strength during use. Of course, the setting method of the horizontal support bar 32 and the vertical support bar 31 here can also be as Figure 2 shown, inserting their ends into the accommodation space 33 and bending them to increase the friction, also achieving the effect that the horizontal support bar 32 and the vertical support bar 31 are not easily separated.

[0032] Since there is a receiving space 33 on both the left and right sides of the same vertical support bar 31, relevant restrictions are made on whether the vertical support bar 31 is inserted into the receiving space 33 on its left or right side when it is bent and inserted. Specifically, when inserting, the insertion position is selected as follows: for the transverse support bar 32 closest to the end of the vertical support bar 31, the side that is wound and attached to the vertical support bar 31 is the bending direction of this end of the vertical support bar 31. If it is not set like this, when the transverse support bar 32 closest to the end of the vertical support bar 31 is tightened, it is easy to slip off from the arc-shaped protrusion 311 of the vertical support bar 31, resulting in the entire filter cartridge 3 starting to come apart from this end position; while in this embodiment, such a setting can withstand a greater force when the transverse support bar 32 is tightened without the end of the filter cartridge 3 coming apart, thereby increasing the structural strength of the overall filter cartridge 3 and enabling it to adapt to operating conditions with greater pressure or flow rate. Further, the insertion depth of the vertical support bar 31 is set between 0.5 cm and 10 cm, preferably 5 cm, so as to ensure that under normal operating pressure and flow rate conditions, the vertical support bar 31 will not easily fall out of the receiving space 33, while saving the material of the filter cartridge 3 and reducing costs.

[0033] From Figure 2It is not difficult to find that adjacent weaving units share a vertical support bar 31. Regarding the specific winding method of the two horizontal support bars 32 of adjacent weaving units wound around this vertical support bar 31, we have also made relevant restrictions, that is: the horizontal support bars 32 of adjacent weaving units are arranged alternately on the shared vertical support bar 31. Intuitively speaking, for any vertical support bar 31, when observed from bottom to top or from top to bottom, the horizontal support bar 32 on its surface first winds around one circle of the horizontal support bar 32 of the left weaving unit, then winds around one circle of the horizontal support bar 32 of the right weaving unit, then winds around one circle of the horizontal support bar 32 of the left weaving unit, and then winds around one circle of the horizontal support bar 32 of the right weaving unit... and so on in an alternating cycle. Further, it is limited that the two horizontal support bars 32 of adjacent weaving units after winding are not only alternately distributed on the surface of their shared vertical support bar 31, but also are sequentially attached to each other from top to bottom or from bottom to top. (In the attached drawings, they are not drawn. Since the horizontal support bars 32 and the vertical support bars 31 are distributed densely, in order to more clearly show their winding method, the attachment method is not drawn in the attached drawings). The attachment setting method can increase the contact area between the horizontal support bars 32 and increase their friction force, thereby improving the overall pressure resistance and structural strength of the filter screen cylinder 3. Of course, when the pressure or flow rate is not particularly large, for cost-saving considerations, the attachment method can also be not used for weaving. Of course, the horizontal support bars 32 on the surface of the vertical support bar 31 can also be that the horizontal support bar 32 of the left weaving unit winds around n circles, and then the horizontal support bar 32 of the right weaving unit winds around m circles, and so on in a cycle, where n and m are both positive integers, and n and m can be the same. That is, as shown in Figure 5 , Figure 6 , Figure 7 and Figure 8 . (Since the lines are relatively dense, the single horizontal support bar 32 is simplified to a single line in the figure to make the attached drawings clearer and more intuitive). Among them, Figure 5 is a schematic structural diagram of the O-shaped winding method when n and m are 2 and 2 respectively; Figure 6 is a schematic structural diagram of the O-shaped winding method when n and m are 1 and 2 respectively; Figure 7 is a schematic structural diagram of the O-shaped winding method when n and m are 1 and 3 respectively; Figure 8 is a schematic structural diagram of the O-shaped winding method when n and m are 2 and 3 respectively. In other embodiments, the horizontal support bar 32 within the same weaving unit can be wound singly or in multiple strands. If it is wound in multiple strands, the winding directions can be the same or opposite, and can be arbitrarily selected. As shown in Figure 4As shown, within a single weaving unit, two transverse support bars 32 are wound in an "O" shape, and the winding directions of the two transverse support bars 32 are opposite. Further, in other embodiments, the winding manner of the transverse support bars 32 on the weaving unit can be an "O" shape winding, an "8" shape winding, or a mixed winding of "O" shape and "8" shape, which is also reflected in the relevant drawings.

[0034] In this embodiment, we further define the thickness relationship between the transverse support bar 32 and the vertical support bar 31. Denote the diameter of the vertical support bar 31 as d1 and the diameter of the transverse support bar 32 as d2. d1 and d2 satisfy: 0.5 < d1:d2 < 2. That is, the maximum diameter of the transverse support bar 32 does not exceed twice the diameter of the vertical support bar 31, and its minimum diameter is not less than half of the diameter of the vertical support bar 31. Such a setting can ensure that the pressures that the filter cartridge 3 can withstand in the horizontal and vertical directions are relatively uniform and stable. If the vertical support bar 31 is too thin, the vertical support bar 31 is likely to break. If the transverse support bar 32 is too thin, the transverse support bar 32 is likely to break. Within the range of 0.5 < d1:d2 < 2 is the best preferred range, and further preferably d1:d2 = 1. In this way, during the manufacturing process, it is more convenient, and only support bars of the same thickness need to be prepared as the transverse support bar 32 or the vertical support bar 31 for weaving. To prove the relationship between d1 and d2, we conducted the following experiment. Select several filter cartridges 3 with d1:d2 < 0.5, several filter cartridges 3 with 0.5 < d1:d2 < 2, and several filter cartridges 3 with d1:d2 > 2, and conduct destructive experiments under the same conditions, and record their service lives. The specific same conditions here refer to: the transverse support bars 32 are all wound in an "O" shape, and are alternately attached to the shared vertical support bar 31, the vertical support bar 31 and the transverse support bar 32 are bent and inserted to the same depth, and under the same working pressure, flow rate, temperature, filtering the same fluid. The specific results are shown in Table 1:

[0035] Table 1:

[0036]

[0037]

[0038] In this embodiment, we denote the width of a single weaving unit as L, and further define the relationship between L and the diameter d1 of the vertical support bar 31 as follows: 2<L:d1<10. The advantage of this arrangement is that there is a certain spacing distance between adjacent vertical support bars 31, which can ensure sufficient accommodation space 33, so that the ends of the transverse support bars 32 and the vertical support bars 31 can be bent and inserted therein; at the same time, the distance between adjacent vertical support bars 31 should not be too large, so that the shape of the filter cylinder 3 can be closer to a cylindrical shape. If the ratio of L:d1 is too large, the accommodation space 33 generated will be very large, and the vertical support bar and the transverse support bar 32 will be easily dislodged after being bent and inserted into the inside thereof and subjected to force, causing the filter cylinder 3 to fall apart. More specifically, we define the width L of a single weaving unit as the spacing between the center positions of adjacent vertical support bars 31. Similarly, we set up products with different ratios of L:d1 for testing, and recorded the difficulty of bending the horizontal support strip 32 and the vertical support strip 31 to insert into the accommodation space 33 under different ratios, as well as the service life of the filter cartridge 3 (i.e., the service time of the filter cartridge 3 from the beginning of use to the end of the filter cartridge 3 under the working conditions of large flow and high pressure). The specific results are shown in Table 2. The relevant conditions not given in Table 2 are all selected as the same conditions.

[0039] Table 2:

[0040]

[0041]

[0042] In this embodiment, the angle α between the transverse support bar 32 and the horizontal plane is further limited, and the angle is set between 0°-30°. If the angle is greater than 30°, the number of windings of the transverse support bar 32 in the same weaving unit becomes smaller, so that the structural strength of the entire filter cylinder 3 decreases. In addition, the larger the angle, the smaller the angle between the transverse support bar 32 and the vertical support bar 31, which makes the filter cylinder 3 more likely to deform and fail. The easy deformation and failure here specifically refers to the situation that when the pressure and flow rate are constant during use, the larger the angle α, the easier it is for the filter cylinder 3 to fall apart. Similarly, we have also conducted relevant experiments on this and recorded them, see Table 3 for details:

[0043] Table 3:

[0044]

[0045]

[0046] Furthermore, in this embodiment, the depth of the vertical support bar 31 inserted into the accommodation space 33 is also limited to between 0.5 cm and 10 cm; the depth of the horizontal support bar 32 inserted into the accommodation space 33 is also limited to between 0.5 cm and 10 cm. Such a depth range can ensure that the inserted section 312 of the vertical support bar 31 will not easily come out after insertion, and a certain length is left for the horizontal support bar 32 to wind around its surface to increase friction.

[0047] The preferred embodiments of the present invention have been described in detail above. However, it should be understood that after reading the above teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention. These equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. A large flow filter element, comprising a filter element body, a filter element top cover arranged on the top of the filter element body and a filter element bottom cover arranged on the bottom of the filter element body, characterized in that: The filter element body is wrapped with a circle of cylindrical filter cylinder, and the filter cylinder is a woven structure and includes a plurality of vertical support bars and transverse support bars. Any two adjacent vertical support bars are wound into a woven unit through the transverse support bars to form a accommodating space; the ends of the vertical support bars are bent to form an insertion section inserted into the accommodating space; the bending parts of the vertical support bars form an arc-shaped protrusion; the ends of the transverse support bars are inserted into the accommodating space.

2. The large flow filter element according to claim 1, characterized in that: The ends of the transverse support strips are bent.

3. The large flow filter element according to claim 1, characterized in that: The insertion depth of the insertion section of the vertical support bar is set to be between 0.5cm and 10cm, and the insertion depth of the end of the horizontal support bar into the accommodating space is set to be between 0.5cm and 10cm.

4. The large flow filter element according to claim 1, characterized in that: The transverse support strip is wound in an O-shape or an 8-shape or a mixed winding of the O-shape and the 8-shape.

5. The large flow filter element according to claim 4, characterized in that: The side of the transverse support bar closest to the end of the vertical support bar that is rolled up and fits the vertical support bar is the bending direction of the end of the vertical support bar.

6. The large flow filter element according to claim 1, characterized in that: The adjacent weaving units share a vertical support bar, and the transverse support bars of the adjacent weaving units are arranged alternately on the shared vertical support bar.

7. The large flow filter element according to claim 1, characterized in that: The adjacent transverse support strips wound on the vertical support strips are tightly fitted to each other.

8. The large flow filter element according to claim 1, characterized in that: The ratio between the diameter d1 of the vertical support bar and the diameter d2 of the horizontal support bar satisfies: 0.5<d1:d2<2.

9. The large flow filter element according to claim 1, characterized in that: The ratio between the width L of the single weaving unit and the diameter d1 of the vertical support bar satisfies: 2<L:d1<10.

10. The large flow filter element according to claim 1, characterized in that: The included angle α of the transverse support strip and the horizontal plane is set between 0° and 30°.

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