Filter comprising a v-shaped arrangement of media packs and protective grids
The protective grid, designed with a centered splice structure, solves the problems of filter stability and pressure loss, achieves more uniform stress distribution and material savings, and improves the filter's stability and resistance to breakage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CARL FREUDENBERG KG
- Filing Date
- 2023-07-13
- Publication Date
- 2026-08-04
AI Technical Summary
In the existing technology, the protective grid of the filter is not stable enough in construction and has a large pressure loss, making it difficult to achieve a balance between high stability and low pressure loss with a simple construction.
The protective grid, designed with a fixed-center splice structure, includes concentric annular or spiral curves and radial connectors, forming a spider web-like grid structure to evenly distribute the force and guide it into the frame, avoiding the formation of straight tie rods.
It achieves a more uniform stress distribution under the same function, reduces material usage, improves the stability and crack resistance of the grid, and reduces pressure loss.
Smart Images
Figure CN117398777B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a filter comprising: a plurality of filter media packs, wherein every two filter media packs are arranged in a V-shape and the filter media packs are permeated by gas flowing from the unpurified gas side of the filter to the purified gas side of the filter for purification; a frame for receiving the filter media packs; and a protective grille, wherein one protective grille is disposed on the purified gas side of the respective filter media pack. Background Technology
[0002] Various types of filters, such as cartridge filters, are used in gas turbines, compressors, air conditioning and ventilation equipment to purify incoming airflow.
[0003] EP 3 831 461 A1 discloses a filter comprising multiple filter media packets, wherein every two filter media packets are arranged in a V-shape and the filter media packets are permeated by gas flowing from the unpurified gas side of the filter to the purified gas side of the filter for purification. Such a filter is also called a V-unit (Zellen) filter or, in English, a V-Bank-Filter. The filter has a frame for receiving the filter media packets, the frame including protective grilles for the filter media, wherein one protective grille is disposed on the respective filter media packet on the purified gas side. Such protective grilles are also called rupture protection grilles. Through the protective grilles, the filter media can be held in its position and protected against the effects and damage, especially during assembly and operation. The protective grilles prevent portions of the filter media from detaching and reaching downstream equipment, where they could cause damage, for example, in a gas turbine. The construction of the grilles should be optimized according to the prior art regarding stability and material requirements, for which a considerable torque is required. Summary of the Invention
[0004] Task proposal
[0005] The objective of this invention is to provide a filter comprising a particularly stable and technologically advantageous protective grid, while simultaneously achieving a simple construction and low pressure loss.
[0006] Technical solutions
[0007] This task is addressed by the cartridge filter described below and required for protection.
[0008] According to the present invention, it is advantageous to use a protective grille comprising a centrally oriented, for example concentric or spirally arranged patch structure surrounding a center.
[0009] This invention relates to a cartridge filter comprising: a plurality of filter media packs, wherein every two filter media packs are always arranged in a V-shape in pairs, referred to as a so-called V-unit filter or, in English, a V-Bank filter. The filter media packs are permeated by gas flowing through the filter from the unpurified gas side to the purified gas side for purification. The filter further has a frame for receiving the filter media packs and protective grilles, wherein one protective grille is disposed on the respective filter media pack on the purified gas side.
[0010] According to the invention, the protective grille has a grille structure comprising a plurality of substantially closed curves of different sizes, such as concentric annular or spiral curves, arranged around at least one center of the protective grille, and having a plurality of connectors radially oriented relative to the center of the protective grille, the connectors connecting the closed curves to each other. Not only the curves but also the connectors constitute tabs of the protective grille. The protective grille thereby has a spiderweb-like grille structure.
[0011] In an advantageous manner, the forces acting on the protective grid can be well and evenly distributed through this grid structure and subsequently directed into the frame of the cartridge filter. In other words, the more uniform force distribution occurring on all four sides of the frame due to the design of the protective grid according to the invention results in a more uniform stress distribution in the protective grid and thus enables, for example, a narrower structure of the tabs to achieve the same functionality.
[0012] The essentially closed curve here refers to a curve that may have small breaks at some points. That is, the curve is not mathematically continuous or continuous, but rather the following tabs that constitute the grid structure are characterized by a closed extension around the center of the protective grid.
[0013] Calculations have shown that individual interruptions in a closed curve do not adversely affect the stability of the protective grid.
[0014] In a first embodiment of the filter, the closed curve is formed as a concentric ring or egg shape, which may also be called an egg-shaped curve or egg-shaped line, especially as a circle or ellipse.
[0015] In a second embodiment of the filter, the closed curve is formed as a concentric polygon, particularly including at least six corners, for example as an equilateral hexagon.
[0016] In a third embodiment of the filter, the closed curve is formed as a central spiral, for example, as an Archimedean spiral.
[0017] In a particularly advantageous and therefore preferred further configuration of the filter according to the invention, the connectors between a first closed curve and a second closed curve further away from the center are arranged radially offset relative to the connectors between the second closed curve and the next closed curve further away from the center, such that no struts are formed that guide a straight line from the center of the protective grille to its edge. Nor are there struts that guide a straight line from the first edge of the protective grille to the other edge. This design has the advantage that multiple connectors are used for the distribution of forces acting on the protective grille, and that these forces are evenly distributed. This allows the cross-sections of the closed curves and connectors to be kept small, thus saving material.
[0018] In a further configuration of the filter, the closed curve is formed by portions of the curve in the edge region of the protective grille, for example, by portions of the curve in the four corner regions of the protective grille in the case of circular curves and rectangular protective grilles. In this way, the central structure can continue into the edge region. This is particularly important in the case of a rectangular outer contour of the protective grille.
[0019] In the filter, the closed curve may have at least some, especially in the edge region of the protective grid, various interruptions.
[0020] In different variations of the filter, the closed curves can be arranged centered around one, two, three, or four centers. This allows for an advantageous configuration of force flow within the protective grid. Two, three, or four centers are particularly preferred when the protective grid has a large planar (by area) extension and / or the protective grid has unequal (length-width) edge length ratios and / or the grid structure should be constructed with particularly small cross-sections of the tabs (i.e., closed curves and connectors).
[0021] In a further configuration of the filter, the corresponding protective grille is surrounded by edge braces, which can be interrupted. The edge braces improve the stability of the protective grille, and the interruption of the edge braces allows for material savings where they are not required.
[0022] In one possible design of the filter, the corresponding protective grille is constructed as a single piece, particularly as an injection-molded part, and thus is particularly advantageous in terms of manufacturing technology: the protective grille is especially well-suited as an injection-molded part due to its centered implementation, as it can be filled from the center by a so-called casting mesh. This reduces the number of seams, resulting in higher strength for the protective grille.
[0023] Furthermore, by reducing stress in the protective grid through filling from the center, this advantageously results in high breaking strength and low warpage (Verzug) of the protective grid.
[0024] In a further configuration of the filter, the protective grille is locked to the frame material, for example, by adhesive bonding or casting. This achieves a particularly reliable and durable connection. If the corresponding protective grille has edge braces, a material-locking connection can exist in the area of the edge braces.
[0025] The present invention and its advantageous further embodiments also combine with each other—provided that this is technically appropriate—to constitute advantageous further embodiments of the present invention.
[0026] Other advantages of the invention and its structural and functional advantages are described in the embodiments with reference to the accompanying drawings. Attached Figure Description
[0027] The invention should be explained in more detail with the aid of the exemplary accompanying drawings. Corresponding elements and components are given the same reference numerals in the drawings. For the sake of better clarity of the drawings, a faithful representation to scale has been omitted.
[0028] As shown in the diagram:
[0029] Figure 1a and 1b Two views of the filter according to the invention are shown;
[0030] Figure 2 An exploded view of the filter according to the invention is shown;
[0031] Figure 3 A detailed view of a first embodiment of the protective grille is shown;
[0032] Figure 4a , 4b Figures 4c and 4d show schematic diagrams of alternative implementations of the protective grille. Detailed Implementation
[0033] Figure 1a b and b show the filter 100 according to the invention in two perspective views.
[0034] The cartridge filter 100 has eight filter media packs 2, which can be formed from pleated filter media. Every two filter media packs 2 are always arranged in a V-shape. The filter media packs 2 are used to allow gas to flow through the filter 100 from the unpurified gas side A to the purified gas side B along the flow direction L for purification.
[0035] Figure 1a From the unpurified gas side A and Figure 1b Filter 100 is shown from the clean gas side B.
[0036] Frame 1 is provided to accommodate filter media package 2. Further by... Figure 2 The structure 1 of the frame is thus derived. A protective grille 40 is disposed on the corresponding filter media package 2 on the clean gas side (A). Further... Figure 3 The structure of the protective grille 40 is thus derived. Through the protective grille 40, the filter media of the filter media package 2 is held in its position, protected from influence, and downstream equipment is protected from damage.
[0037] In the illustrated embodiment, the corresponding protective grille 40 is formed as a single injection-molded part and is material-locked to the frame 1, for example, by casting, in the area of the edge tie rod 45 on its surrounding edge.
[0038] Figure 2 An exploded view of a cartridge filter 100 according to the invention and the construction of its frame 1 are shown. The frame 1 has a head plate 10 including a plurality of crossbars, a foot plate 20 arranged parallel thereto including a plurality of crossbars, and a side plate 30 disposed between them. A filter media pack 2 is disposed between the head plate 10, the foot plate 20, and the side plate 30. In the illustrated embodiment, the head plate 10, the foot plate 20, and the side plate 30 are each segmented and constructed in multiple pieces. In an alternative embodiment (not shown), the plates 10, 20, and 30 may also be designed as a single piece.
[0039] The filter 100 can be pushed into the rectangular drawer compartments (not shown) of the filter receiving part in a drawer-like manner. The filter 100 then rests against the filter receiving part with the support surface of the head plate 10 and can be connected to the filter receiving part, for example, by screwing. Alternatively, the filter receiving part may have multiple compartments so as to receive multiple corresponding filters 100, which are then arranged in an array and form a so-called filter wall.
[0040] Figure 3 A detailed view of a first embodiment of the protective grille 40 is shown.
[0041] The protective grille 40 has a grille structure comprising circular, substantially closed curves 42 of varying sizes arranged concentrically around a center 41 of the protective grille 40. The diameter of the circular, closed curves 42 increases with increasing distance from the center 41 of the protective grille.
[0042] The grid structure of the protective grid 40 also has a plurality of connectors 44 radially oriented relative to the center 41 of the protective grid 40, which connect closed curves 42 to each other.
[0043] The connector 44 is relatively short and is radially offset between the connector 44 between the closed first curve and the closed second curve 42, respectively, so as not to form a pull rod that guides in a straight line from the center 41 of the protective grille 40 toward the edge of the protective grille 40.
[0044] In the edge region of the protective grille 40, the closed curve 42 is formed through a portion 47 of the curve 42, i.e., through a partial circle. That is, the concentric pattern of the closed curve 42 continues into the edge region.
[0045] The closed curve 42 may have at least some of the various interruptions 43, especially in the edge region of the protective grille 40, and is still referred to as the closed curve 42.
[0046] The protective grille 40 is surrounded by edge tie rods 45, which form the outer contour of the protective grille 40 at right angles. The edge tie rods 45 may also have an interruption 46.
[0047] Material can be saved by using the interruption parts 43 and 46, and as long as only a small number of interruption parts 43 and 46 are provided, the stability and anti-breakage effect of the protective grille 40 will not be significantly reduced.
[0048] Figure 4a , 4b Figures 4c and 4d show schematic diagrams of alternative embodiments of the protective grille 40. The connector 44 of the grille structure is omitted for better clarity.
[0049] according to Figure 4a The closed curve 42 is formed as an egg shape.
[0050] according to Figure 4b The closed curve 42 is formed as a polygon.
[0051] according to Figure 4c The closed curve 42 is arranged concentrically around the two centers 41.
[0052] according to Figure 4d The closed curve 42 is arranged in a spiral around the center.
[0053] Other features of the protective grille 40 can be similar to those in Figure 3 The protective grille 40 shown in the figure is implemented.
Claims
1. A cartridge filter (100) comprising: Multiple filter media packs (2), wherein every two filter media packs (2) are arranged in a V-shape and the filter media packs (2) are through which gas flows from the unpurified gas side (A) of the filter (100) to the purified gas side (B) of the filter (100) for purification; a frame (1) for receiving the filter media packs (2); and a protective grille (40), wherein each protective grille (40) is disposed on the purified gas side (A) of the corresponding filter media pack (2), characterized in that the protective grille (40) has a grille structure comprising different sizes disposed centrally around at least one center (41) of the protective grille (40). Small, essentially closed curves (42) and multiple connectors (44) radially oriented relative to the center (41) of the protective grille (40), the connectors connecting the closed curves (42) to each other, the closed curves (42) being configured as concentric egg shapes, the connectors (44) between each of the first closed curve and the second closed curve (42) being radially offset relative to the connectors (44) between the second closed curve and the next closed curve (42), such that no tie rods are formed that guide a straight line from the center of the protective grille to the edge of the protective grille, nor are there any tie rods that guide a straight line from the first edge of the protective grille to the other edge.
2. The cartridge filter of claim 1, wherein The closed curve (42) is formed in the edge region of the protective grid through a portion (47) of the curve (42).
3. The cartridge filter according to claim 1 or 2, characterized in that The closed curve (42) has at least some of the various interruptions (43).
4. The cartridge filter according to claim 1 or 2, characterized in that, The closed curve (42) is set around one, two, three or four centers (41) with a fixed center.
5. The cartridge filter according to claim 1 or 2, characterized in that, The corresponding protective grille (40) is surrounded by interrupted edge tie rods (45).
6. The cartridge filter according to claim 1 or 2, characterized in that, The corresponding protective grille (40) is constructed as a single piece.
7. The cartridge filter according to claim 1 or 2, characterized in that, The protective grille (40) is materially locked to the frame (1).
8. The cartridge filter according to claim 1, characterized in that, The closed curve (42) is formed as a circle or an ellipse.
9. The cartridge filter according to claim 3, characterized in that, The closed curve (42) has at least partially interrupted portions (43) in the edge region of the protective grille (40).
10. The cartridge filter according to claim 6, characterized in that, The corresponding protective grille (40) is formed as an injection molded part.