Filter comprising v-shaped filter media pack and frame

Abstract

The invention relates to a filter comprising a v-shaped filter media pack and a frame. The invention relates to a cassette filter for filtering an air flow, comprising a plurality of filter medium packs (2), a pair of which is arranged in a v-shape, and comprising a frame (1) for receiving the filter medium packs (2), the frame (1) having an inflow-side head frame (10), two side plates (30) and a plurality of outflow-side floor crossbeams (20), a floor beam (20) is associated with a respective pair of v-shaped filter media packs (2), and the filter additionally has guards (40), each of which is associated with a respective filter media pack on the clean gas side. According to the invention, the guards (40) associated with a respective pair of filter media packs (2) and the floor cross member (20) form a structural unit (24). Such a frame advantageously has a simple and manufacturing-advantageous construction.

Description

Technical Field

[0001] The present invention relates to a cassette filter comprising a plurality of filter medium packs, wherein two filter medium packs are arranged in a V-shape, and the cassette filter comprises a frame for receiving the filter medium packs. Background Art

[0002] In gas turbines, compressors, air conditioning and ventilation systems, various filters, such as cassette filters, are used for cleaning the intake air flow.

[0003] EP 3 831 461 A1 discloses a cassette filter comprising a plurality of filter media packs, wherein two filter media packs are arranged in a V-shape and gas flows through the filter media packs for purification from the raw gas side of the filter to the clean gas side of the filter. Such filters are also known as V-cell filters or V-Bank filters. The filter has a frame for accommodating the filter media packs, including protective grilles for the filter media, wherein a protective grille is provided on the clean gas side of each filter media pack.

[0004] Such a protective screen is also called an anti-split screen. It holds the filter medium in place and protects it from impacts and damage, particularly during assembly and operation. It prevents parts of the filter medium from becoming detached and entering downstream equipment, where they could cause damage, such as in a gas turbine.

[0005] A disadvantage of this filter is the complex assembly of multiple parts and the resulting challenges in configuring the force flow through these components.

[0006] US 2014 096493 A1 and US 9 737 838 B2 show filters having a similar construction.

[0007] Such filters can be inserted into the rectangular drawer compartment of the filter receptacle in a drawer-like manner. Using the support surface of the head frame, the filter then rests against the filter receptacle and can be connected thereto, for example, by screwing. Typically, the filter receptacle has multiple compartments to accommodate a corresponding number of filters, which are then arranged in an array and form a so-called filter wall.

[0008] During operation, the forces acting on the filter's components are transferred via the head frame to the filter receptacle, which includes the drawer compartments and the support structure. The forces acting on the filter's elements themselves require that they be well connected to one another, for example, by adhesive bonding. A disadvantage of these known filters is the design of the connection between the frame elements and the protective grille, and the resulting space-consuming construction. Particularly during operation of cassette filters, high forces act on the joint seams formed by the casting material. In particular, the protective grille must be well secured to ensure that it performs its function. Large amounts of casting material are often used for this purpose. Disadvantageously, a certain instability or lack of strength remains in the filter. Deformation or breakage can lead to leaks during operation. Summary of the Invention

[0009] The object of the present invention is to provide a filter cassette whose frame has a simple, stable and production-friendly design.

[0010] Another object is to provide a cassette filter comprising a frame which has optimized connection security.

[0011] Technical Solutions

[0012] These objects are achieved by a filter cassette as described and claimed below.

[0013] According to the invention, it is considered advantageous to form a cassette filter from only a few elements which can be easily connected to one another during assembly of the filter, which provide a good force flow through the filter and ensure a high stability of the filter.

[0014] The present invention relates to a cassette filter comprising a plurality of filter media packs, wherein two filter media packs are arranged in pairs in a V-shape at an acute angle to one another, and the cassette filter comprises a frame for accommodating the filter media packs. Such filters are also known as V-cell filters or, in English, V-Bank filters. Gas, in particular air, flows through the filter media packs for purification, from the raw gas side of the filter to the clean gas side of the filter in a main flow direction (for short: flow direction).

[0015] The frame comprises an inflow-side head frame, two side panels, and a plurality of outflow-side floor crossmembers, wherein a floor crossmember is assigned to each pair of V-shaped filter media packs. The filter also comprises a protective grille to securely hold the filter media packs in their position during operation of the cassette filter, wherein a protective grille is assigned to each filter media pack on the clean gas side. The filter media packs can, for example, comprise bellows composed of pleated filter media.

[0016] According to the invention, the protective grilles assigned to a respective pair of filter medium packs and the associated floor cross member form a structural unit.

[0017] A protective grille is a support structure comprising at least one strut extending in its longitudinal direction and at least one strut extending in its transverse direction. This support structure prevents components of the filter medium pack from becoming detached during operation and potentially causing damage in the system downstream of the filter cassette on the clean gas side. Such a protective grille can be designed, for example, in the form of a rake, comb, net, in particular a spider web, fence, or grid.

[0018] The term "unit" does not necessarily mean that the two protective grilles and the floor cross member of a unit are also made of one piece and made of the same material. The functions of the two protective grilles and the floor cross member are each integrated into a unit. However, the two protective grilles and the floor cross member of a unit are connected to each other in such a way that they can be combined as a single component with other elements to form a frame when manufacturing the frame of the cassette filter.

[0019] Such a frame advantageously has a simple and manufacturing-friendly design. Since the protective grille does not need to be glued to the floor crossbeam, as is customary in the prior art, the floor crossbeam can be designed to be narrow. This has a favorable effect on the flow resistance of the cassette filter.

[0020] Since the guard grille and the floor cross member form a structural unit, the corresponding transition from the guard grille to the floor cross member can be designed with a uniform material, so that - in contrast to the prior art - it no longer constitutes a weak point but rather optimizes the flow of force. As a result, a higher bending stiffness is achieved in the region of the transition.

[0021] It is also advantageous that the amount of casting material required when manufacturing the cassette filter can be reduced because the protective grille does not need to be cast together with the part of the frame that receives it. The casting material used only has the task of connecting the filter medium pack to the frame.

[0022] No structural space for receiving the protective grille is required on the frame, so that—with the same cassette filter dimensions—the height of the filter medium pack can be increased, thereby improving filtration. In the case of a filter medium pack comprising pleated filter medium, the fold height can be increased, thereby increasing the effective filter area.

[0023] In a particularly advantageous design of the cassette filter, the corresponding structural unit comprises two components. These components are easier to manufacture than a one-piece design of the structural unit. The two components are designed so that they can be easily connected to form the structural unit.

[0024] In an alternative embodiment, the structural unit is designed as a single piece and of a uniform material.

[0025] In one possible embodiment, the two components of a corresponding structural unit are connected to one another in a form-fitting manner. This is advantageous because it can further reduce the need for casting material and provide a particularly stable connection.

[0026] In one possible embodiment, the respective components of the respective structural unit have an L-shaped cross-section with two legs, and each of the respective components has two surfaces arranged at an angle to one another. The two L-shaped components of a structural unit together form a U-shaped configuration, that is, the structural unit has a U-shaped configuration. The structural unit thus has the shape of a groove and can accommodate the casting material. The casting material, which primarily connects, i.e., bonds, the filter medium pack to the structural unit, can also provide a material-locking connection between the two components of the respective structural unit.

[0027] In a further embodiment, the shorter legs of the two components together form a floor cross member, and the longer legs each form a protective screen. This special design discloses an embodiment in which the transition from the protective screen to the floor cross member is made of uniform material without any joints, thereby optimizing the force flow.

[0028] In a further embodiment, the components of the respective structural units butt against each other with their shorter legs at their butt edges, and the butt edges are shaped complementary to each other and are provided with a profile along the butt edges in the longitudinal direction. The two complementary butt edges allow a form-fitting connection of the two components to be achieved in a particularly elegant manner in terms of production technology.

[0029] The abutment edge can be designed in a labyrinthine manner and form a labyrinth seal, thereby forming a sealed groove suitable for casting.

[0030] Additionally or alternatively, latching projections and latching grooves or latching tabs can be formed in the region of the abutting edge. The latching projections and latching grooves or latching tabs are designed as a clip-on connection with a latching mechanism, so that the two components can be locked together and connected in this manner particularly easily, precisely, and quickly.

[0031] In one possible embodiment, the two components of the respective structural unit are designed as identical parts. This allows for particularly cost-effective production of the structural unit. In the case of a complementary design of the contours of the abutting edges, the abutting edges are point-symmetrical, with the center of symmetry being in the center of the floor cross member.

[0032] In a further embodiment of the cassette filter, the floor cross member is provided with a reinforcement element that extends from one protective grille of the structural unit to the other protective grille of the structural unit. For example, the material of the structural unit can have a greater thickness in the region of the reinforcement element. During operation of the cassette filter, the floor cross member is subjected to bending stresses due to forces acting on the protective grilles. The reinforcement element advantageously suppresses bending of the structural unit.

[0033] In a particularly advantageous further development, the protective grille has a lattice structure comprising a plurality of closed curves of different sizes, for example concentric annular curves, arranged centrally around at least one center of the protective grille, and the protective grille has a plurality of connecting elements oriented radially relative to the center of the protective grille, which connect the closed curves to one another. Both the curves and the connecting elements form webs of the protective grille. The protective grille thus has a lattice structure in the form of a textile mesh.

[0034] Advantageously, the forces acting on the protective grille via these lattice structures can be distributed well and evenly and subsequently directed into the frame of the filter cassette. In other words, this design of the protective grille results in a relatively even distribution of forces on all four sides of the frame, which leads to a relatively even distribution of stresses in the protective grille and thus enables, for example, a narrower design of the tabs while maintaining the same functionality.

[0035] A closed curve here means that the curve may have small interruptions at some locations. Therefore, the curve is not continuous or coherent in the mathematical sense, but nevertheless forms a web of a lattice structure that is characterized by a closed extension around the center of the protective grille.

[0036] Calculations have shown that individual interruptions in the closed curve, in particular also in the edge region of the guard grille, do not negatively affect the stability of the guard grille. For details and further details, reference is made to the entire content of DE 10 2022 117 649.

[0037] The invention described and the advantageous further developments of the invention described also constitute advantageous further developments of the invention in combination with one another—as far as this is technically advantageous.

[0038] With regard to further advantages and advantageous structural and functional configurations of the invention, reference is made to the dependent claims and to the description of exemplary embodiments with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Example

[0040] The invention will be explained in more detail with the aid of the accompanying exemplary drawings. Corresponding elements and components are provided with the same reference numerals in the drawings. For the sake of better clarity of the drawings, a true-to-scale representation is omitted.

[0041] The schematic diagram shows:

[0042] Figure 1a and 1b Two views of the filter are shown;

[0043] Figure 2 An exploded view of the filter is shown;

[0044] Figures 3a-3c Shows a structural unit consisting of two parts

[0045] Figure 4 Shows a structural unit consisting of only one part;

[0046] Figure 5 Show Figures 3a-3c Variations of the structural units. DETAILED DESCRIPTION

[0047] Figure 1a and 1b Two perspective views of a filter cassette 100 according to the invention are shown.

[0048] The cassette filter 100 has eight filter media packs 2, which can be formed from pleated filter media. Two filter media packs 2 are always arranged in pairs in a V-shape at an acute angle to one another. Gas flows through the filter media packs 2 for purification, from the raw gas side A of the filter 100 to the clean gas side B of the filter 100, in a flow direction L.

[0049] Figure 1a From the crude gas side A and Figure 1b The filter 100 is shown from the clean gas side B.

[0050] A frame 1 is provided for receiving the filter media pack 2. The frame 1 is further constructed by Figure 2 Draw. Figure 1a 1 and 2 show the plane 16 in which the head frame is located and the plane 31 in which the side panels 30 (at the top in the figure) are located.

[0051] A protective screen 40 is attached to each filter medium pack 2 on the clean gas side (A). The protective screens 40 hold the filter medium of the filter medium pack 2 in place, protect it from impacts, and protect downstream equipment from damage. In the embodiment described, two protective screens 40 together with the floor cross member 20 form a structural unit 24. This structural unit can be a one-piece or multi-part injection-molded part.

[0052] Figure 2 An exploded view of a filter cassette 100 according to a possible embodiment of the present invention and the structure of the frame 1 are shown. The frame 1 comprises a head frame 10 with a plurality of crossbars, a base crossbar 20 arranged parallel to the head frame, and side panels 30 arranged between and perpendicular to the head frame. The filter media pack 2 is arranged between the head frame 10, the base crossbar 20, and the side panels 30, protected on the clean gas side by a protective grille 40, and accommodated in the frame 1. The two protective grilles 40 assigned to a pair of filter media packs 2, together with the associated base crossbar 20, form a structural unit 24. The filter media pack 2 can be integrally connected to the structural unit 24 by means of a casting compound 50.

[0053] The filter 100 can be inserted into a rectangular drawer (not shown) of the filter receptacle in a drawer-like manner. Using the contact surface of the head frame 10 on the shoulder 32, the filter 100 rests against the filter receptacle and can be connected thereto, for example, by screwing. It is also possible for the filter receptacle to have multiple compartments in order to accommodate a corresponding number of filters 100, which are then arranged in an array and form a so-called filter wall.

[0054] Figures 3a-3c A structural unit 24 is shown which is composed of two components 22 , 23 , wherein the two components 22 , 23 are connected to one another in a form-fitting manner. Figure 3a Shown is a structural unit 24, Figure 3b One of the two components 22, 23 is shown and Figure 3c It is shown how the two components 22 , 23 are assembled to form the structural unit 24 .

[0055] The respective components 22, 23 have an L-shaped cross section with two legs 21, 41, and each of the components 22, 23 has two faces arranged at an angle to one another. The shorter legs 21 of the two components 22, 23 together form the floor cross member 20, and the longer legs 41 each form a protective grille 40.

[0056] The components 22 , 23 abut one another with their abutment edges 42 of the shorter leg 21 , and the abutment edges 42 are shaped complementary to one another.

[0057] Here, the abutment edge has a complementary shaped latching projection 43 and a latching groove 44, which latches when the two parts are pushed together (cf. Figure 3c ) are locked into each other.

[0058] The abutment edge 42 is additionally designed in a labyrinthine manner and forms a labyrinth seal. Such labyrinth seals are generally known to those skilled in the art from sealing technology, so a more detailed description is omitted here.

[0059] It can be seen that the two components 22, 23 are designed as a common part. The contour of the abutment edge 42 is point-symmetrical with respect to a center of symmetry 46 located in the center of the floor cross member.

[0060] Figure 5 A variant of the previously described structural unit 24 is shown.

[0061] However, the floor cross member 20 is provided here with a reinforcement element 45 which extends from one protection grid 40 of the structural unit 24 to the other protection grid 40 of the structural unit 24 .

[0062] Figure 4 A structural unit 24 consisting of only one component is shown.

[0063] Reference Signs List

[0064] 1 Framework

[0065] 2 filter media packs

[0066] 10-head frame

[0067] 16-head frame flat surface

[0068] 20 Bottom plate beam

[0069] 21 Shorter legs

[0070] 22 First Component

[0071] 23 Second component

[0072] 24 structural units

[0073] 30 Side Panel

[0074] 31 Side panel plane

[0075] 32 shoulder

[0076] 40 guardrail

[0077] 41 Longer legs

[0078] 42 Butt edge

[0079] 43 Locking protrusion

[0080] 44 Locking groove

[0081] 45 reinforcement elements

[0082] 46 Center of symmetry of the profile of the butt edge

[0083] 50 Position of casting material

[0084] 100 cassette filters

[0085] A Raw gas side

[0086] B Net gas side

[0087] L Flow direction

Claims

1. A cassette filter (100) for filtering an air flow, said cassette filter comprising a plurality of filter media packs (2), wherein: A pair of filter media packs (2) are arranged in a V-shape, and the cassette filter comprises a frame (1) for receiving the filter media packs (2). The frame (1) comprises an inflow-side head frame (10), two side panels (30) and a plurality of outflow-side floor cross members (20), wherein a floor cross member (20) is assigned to each pair of filter medium packs (2) arranged in a V-shape, wherein the filter additionally comprises a protective grille (40), wherein a protective grille (40) is assigned to each filter medium pack (2) on the clean gas side. It is characterized in that The protective grilles (40) assigned to the respective pair of filter medium packs (2) and the floor crossbeam (20) form a structural unit (24).

2. The cassette filter according to claim 1, characterized in that The structural unit (24) comprises two components (22, 23).

3. The cassette filter according to claim 2, characterized in that The two components (22, 23) are connected to each other in a form-fitting manner.

4. The cassette filter according to any one of claims 2 to 3, characterized in that The respective components (22, 23) have an L-shape in their cross section with two legs (21, 41), and the components (22, 23) each have two faces arranged at an angle to one another.

5. The cassette filter according to claim 4, characterized in that The shorter legs (21) of the two components (22, 23) together form a floor cross member (20), and the longer legs (41) each form a protective grille (40).

6. The filter cassette according to any one of claims 4 to 5, characterized in that The components (22, 23) abut one another with their abutment edges (42) of the shorter legs (21), and the abutment edges (42) are shaped complementary to one another.

7. The cassette filter according to claim 6, characterized in that The abutment edge (42) is designed in a labyrinthine manner.

8. The cassette filter according to claim 6 or 7, characterized in that: In the region of the abutment edge (42), a latching projection (43) and a latching groove (44) or a latching web are formed.

9. The filter cassette according to any one of claims 2 to 8, characterized in that The two components (22, 23) are designed as identical parts.

10. The filter cassette according to any one of the preceding claims, characterized in that The floor cross member (20) is provided with a reinforcement element (45) which extends from one guard grille (40) of the structural unit (24) to another guard grille (40) of the structural unit (24).

11. The filter cassette according to any one of the preceding claims, characterized in that The guard grille (40) has a lattice structure comprising closed curves of different sizes arranged centrally around at least one center of the guard grille (40) and comprising a plurality of connecting elements oriented radially relative to the center of the guard grille (40) and connecting the closed curves to each other.

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