Filter housing for reversible mounting of a filter element

Abstract

Filter housing (1) for reversibly receiving a filter element (2), wherein the filter housing (1) has a circumferential wall (3) which preferably comprises four filter housing parts or filter housing part areas arranged at right angles to each other, wherein the filter housing (1) has a lateral opening (4) in the wall (3) for inserting or removing the filter element (2), has a circumferential, preferably linear, contact area (7) in its interior, against which the filter element (2) rests in its edge region when inserted, and furthermore an actuating device (8) is provided in the interior of the filter housing (1), by means of which the filter element (2) can be moved between a removal position and a fixing position, wherein the actuating device (8) has at least one effective surface (9) acting on the filter element (2),so that the filter element (2) is pressed tightly against the contact area (7) when the actuating device (8) is in the fixing position, and the filter element (2) can be inserted into the filter housing (1) via the opening (4) in the insertion direction (10) or removed from the filter housing (1) in the opposite direction (10) when the actuating device (8) is in the removal position, characterized in that at least one effective surface (9) of the actuating device (8) acts on a counter surface (13) of at least one transmission element (14), wherein at least one transmission element (14), preferably each transmission element (14), has at least one spring (15) on its side facing away from the at least one effective surface (9), which acts directly or indirectly on the filter element (2) with a partial area facing away from the transmission element (14), and that at least one spring (15) is designed as a coil spring having two ends.wherein each coil spring is in contact with the transmission element (14) at one of its two ends.

Description

[0001] The invention relates to a filter housing for the reversible reception of a filter element, wherein the filter housing has a circumferential wall, which preferably comprises four filter housing parts or filter housing part areas arranged at right angles to one another, wherein the filter housing has a lateral opening in the wall for inserting or removing the filter element, has a circumferential, preferably linear, contact area in its interior, against which the filter element rests in its edge region when inserted, and furthermore provides an actuating device in the interior of the filter housing, by means of which the filter element can be moved between a removal position and a fixing position, wherein the actuating device has at least one working surface acting on the filter element.so that, when the actuating device is in the fixing position, the filter element is pressed tightly against the contact area, and when the actuating device is in the removal position, the filter element can be inserted into the filter housing through the opening in the insertion direction or removed from the filter housing in the opposite direction of insertion.

[0002] A system comprising a filter housing and a reversibly insertable filter element arranged in a filter frame is known in the prior art. On its underside, the filter frame has a flat spring on each of two opposite sides, with one end of each flat spring being fixed to the filter frame, while the other end is movable relative to the filter frame. The actuating device acts directly on the flat spring. A filter element is typically replaced after about 10 years. During this relatively long period, the flat spring is subjected to a quasi-static load and gradually loses its tension. Consequently, for example, after a replacement, it is not always guaranteed that the new filter element will be pressed into the fixed position with sufficient pressure.

[0003] The object of the invention is to avoid the aforementioned disadvantages and to provide a filter housing in which the filter element is pressed into the fixing position with sufficient pressure even after many years.

[0004] This problem is solved by having at least one effective surface of the actuating device act on a counter surface of at least one transmission element, wherein at least one transmission element, preferably each transmission element, has at least one spring on its side facing away from the at least one effective surface, which acts directly or indirectly on the filter element with a partial area facing away from the transmission element, and wherein at least one spring is designed as a coil spring having two ends, with each coil spring being in contact with the transmission element at one of its two ends. Preferably, the general extent of the transmission element is orthogonal to the direction of action of the spring(s). The spring(s) is / are oriented such that its direction of action is parallel to the direction of action of the actuating device. Coil springs can exert a virtually unchanged tension even after many years.This is because the tendency to relax is significantly lower than with a flat spring. Furthermore, coil springs can be designed very precisely. Using coil springs allows for high contact pressure to be maintained for many years to ensure the desired filter performance. Moreover, the contact pressure with which the filter element is pressed tightly against the mounting surface when the actuating device is in the fixed position can be adjusted very precisely. The filter housing has two ends, each typically fitted with a flange. This allows the filter housing to be connected to existing ductwork of a ventilation system. The shape of the filter element is adapted to the shape of the flow cross-section of the filter housing. For example, if the filter housing has a square flow cross-section, the filter element will be square.The filter element can be, for example, a HEPA or ULPA filter. These are high-performance particulate filters. The filter element can also be arranged in a filter frame. In the embodiment according to the invention, the actuating device acts on the transmission device, which then acts directly on the spring(s). If a spring acts directly on the filter element, it is in direct contact with the spring element. If a spring acts indirectly on the filter element, there is another component between the spring and the filter element.

[0005] The actuating device can be elongated, preferably rod-shaped, and can be rotatably mounted about its longitudinal axis for movement between the removal and fixing positions. The actuating device can, for example, be designed as an elongated sheet metal plate. Rotation of the elongated sheet metal plate moves the filter element between its removal and fixing positions.

[0006] The actuating device can preferably be designed as a rod. The rod preferably has a round cross-sectional area. However, other cross-sectional shapes, for example a rectangular cross-sectional shape, are also possible.

[0007] The actuating device can be aligned parallel to the insertion direction. Such a design is particularly suitable, for example, when the filter housing is installed in such a way that only the side of the filter housing containing the opening is accessible. Of course, it is also entirely possible for the actuating device to be aligned perpendicular to the insertion direction.

[0008] The actuating device can have at least one displacement element, preferably designed as a disc arranged eccentrically on the actuating device, the outer surface of which serves at least partially as an effective surface. In the simplest case, the displacement element can be a projection extending laterally relative to the actuating device, which, when the actuating device rotates, causes the filter element to be displaced between its removal position and its fixation position. The front portion of the projection constitutes the effective surface.

[0009] Preferably, the actuating device can have two displacement elements arranged at a distance from each other, the distance between the displacement elements being such that the two displacement elements act directly or indirectly on the edge regions of two opposite sides of the filter element. In such a configuration, the actuating device acts on the filter element on two opposite sides. When the actuating device is in the fixed position, the filter element is pressed tightly against the contact area on both sides.

[0010] The end of the actuating device facing the opening can be designed as a handle or have a handle. If the actuating device is designed as a rod, the end facing the opening can be angled at 90° and thus form a handle.

[0011] The transmission element can have at least one pot-shaped receiving area for fastening at least one coil spring, wherein at least one coil spring is located with one of its two ends in a receiving area, preferably clamping.

[0012] Advantageously, the transmission element can have at least one pot-shaped receiving area on each side of the mating surface. In such a design, the actuating device acts on the filter element on both sides of the actuator, pressing it tightly against the mating area.

[0013] At least one coil spring can protrude partially from the top of its respective pot-shaped receiving area when the actuating device is in the fixed position. This ensures that the transmission element does not come into contact with the filter element, even in the fixed position. Instead, only the coil spring acts on the filter element, even in the fixed position.

[0014] Inside the filter housing, a mounting frame can be provided, on which at least one transmission element, preferably all transmission elements, are provided, the mounting frame being movable towards the contact area by means of the actuating device. The mounting frame serves, among other things, as a support and guide for the filter element or the filter frame when inserting it into or removing it from the filter housing.

[0015] The mounting frame can consist of two parallel profiles, preferably U-shaped, arranged at a distance from each other, and of two angle profiles arranged at right angles to the profiles and also parallel to each other.

[0016] At least the profile facing the opening in the installed state, preferably both profiles, can be U-shaped and at least the profile facing the opening in the installed state, preferably both profiles, can each have a leg facing the contact area, a leg facing away from the contact area and a web connecting the legs.

[0017] The transmission element can be displaced relative to the mounting frame in the direction of the installation area.

[0018] It is advantageous if the transmission element forms a unit with the at least one pot-shaped receiving area and the at least one spring, the unit having an elongated hole that is oriented in the direction of the contact area.

[0019] In this case, at least the filter housing part facing the opening or the filter housing part area of ​​the receiving frame facing the opening can have at least one support element on which the transmission element rests when the actuating device is in the removal position.

[0020] The mounting frame can have at least one of the two profiles, preferably both profiles, each with an elongated hole oriented orthogonally to the longitudinal extent of the respective profile and preferably positioned centrally with respect to the longitudinal extent of the respective profile. The orientation of each elongated hole allows the mounting frame to be moved towards the contact area when the actuating device is moved from the removal position to the fixing position.

[0021] The invention also relates to a system comprising a filter housing according to one of the claims, a filter element having a filter frame, and a closure element, preferably of a flat design, wherein the closure element seals the opening in the filter housing in the fixed position of the filter frame. After the filter element is inserted into the filter housing, the closure element is mounted from the outside in front of the opening, for example by screwing it on, so that the opening in the filter housing is sealed. The closure element can, for example, be a lid attached to the filter housing by means of screws.

[0022] The following section explains exemplary embodiments of the invention illustrated in the drawings. The drawings show: Fig. 1. An oblique top view of both a filter housing with four filter housing parts or filter housing part areas arranged at right angles to each other and a mounting frame located therein, and of a filter element pulled out of the filter housing and arranged in a filter frame, Fig. 2 the filter housing after Fig. 1 without filter element, Fig. 3 the object according to Fig. 1, wherein the filter element and the mounting frame are inserted into the filter housing, Fig. 4. An oblique view of the recording frame in isolation. Fig. 5 the filter housing with the filter element inserted therein, wherein the actuating device is in its removal position, Fig. 6 the detail from Fig. 5, Fig. 7 the filter housing with the filter element inserted therein, wherein the actuating device is in its fixing position, Fig. 8 the detail from Fig. 7, Fig. 9+ Fig. 10 alternative embodiments of the filter housing according to the invention and Fig. 11 the object according to Fig. 3, wherein the opening of the filter housing is closed with a closing element.

[0023] In all figures, identical reference symbols are used for identical or similar components.

[0024] The figures show a filter housing 1 for the reversible installation of a filter element 2. The filter housing 1 has a circumferential wall 3 that comprises four filter housing parts arranged at right angles to each other, the filter housing 1 having a lateral opening 4 in the wall 3 for inserting or removing a filter element 2. The filter housing 1 has two ends, each with a flange 5 provided to allow the filter housing 1 to be connected to existing ducts of a ventilation system.

[0025] Filter element 2 is in Fig. Figure 1 shows the filter element in its extended position. In the illustrated case, the filter element 2 is arranged in a filter frame 6.

[0026] The filter housing 1 contains a mounting frame 20, which will be described in more detail later. Furthermore, the filter housing 1 has a circumferential contact area 7 inside its housing, arranged parallel to and at a distance from the mounting frame 20, against which the filter element 2 rests with its edge when installed.

[0027] Furthermore, an actuating device 8 is provided by means of which the filter element 2 is moved between a removal position located in Fig. 5 is shown, and a fixing position which is in Fig. The actuating device 8, as shown in Figure 7, is movable. The actuating device 8 has two effective surfaces 9 acting on the filter element 2 or the filter frame 6, so that the filter element 2 seals against the contact area 7 when the actuating device 8 is in the fixed position. Fig. 7 and Fig. 8) is pressed down and the filter element 2 is in the removal position with the actuating device 8 ( Fig. 5 and Fig. 6) can be inserted into the filter housing 1 via the side opening 4 in the insertion direction 10, or removed from the filter housing 1 in the opposite direction to the insertion direction 10. When inserted into the filter housing 1, the filter element 2 rests with its surrounding filter frame 6 on the mounting frame 20.

[0028] Fig. Figure 4 shows the mounting frame 20 in isolation and the actuating device 8. The mounting frame 20 also consists of four elements arranged at right angles to each other: two opposing, parallel, U-shaped profiles 22 and two angle profiles 23 arranged at right angles to these, also parallel to each other. Each of the two profiles 22 has a leg 22a facing the contact area 7, a leg 22b facing away from the contact area 7, and a web 22c connecting the legs 22a and b. Each of the two profiles 22 has an elongated hole 24 located centrally with respect to the respective profile 22, oriented orthogonally to the longitudinal extent of the profile 22.

[0029] How the Fig. 1 and Fig. As can be seen from Figure 3, the actuating device 8 is designed as an elongated rod. The actuating device 8 is rotatably mounted about its longitudinal axis in the direction of arrow 11 for movement between the removal position and the fixing position. The rod is aligned parallel to the insertion direction 10 and extends through both elongated holes 24 in the receiving frame 20. The end facing the opening 4 is angled at 90° and thus forms a handle.

[0030] The actuating device 8 has two displacement elements 12. These are each designed as discs arranged eccentrically on the actuating device 8. The outer surface of each disc serves as the effective surface 9. The distance between the two displacement elements 12 is such that, in the illustrated embodiments, the two displacement elements 12 indirectly act on the edge regions of two opposite sides of the filter element 2. Thus, the actuating device 8 indirectly acts on two opposite sides of the filter element 2, namely in the region of its front end, which has the handle, and in the region of the opposite rear end, which, for example, Fig. 2 is shown. With the actuating device 8 in the fixing position, the filter element 2 is pressed tightly against the contact area 7 on both sides.

[0031] The effective surface 9 of each displacement element 12 interacts with a counter surface 13 of a transmission element 14. In the illustrated embodiments, a transmission element 14 is provided on the outer side of each profile 22. The embodiments shown in the figures have two displacement elements 12 and two transmission elements 14. In the embodiment according to the Fig. Each transmission element 14 has two springs 15 designed as spiral springs on its side facing away from the effective surface 9, which act indirectly on the filter element 2 with the end facing away from the transmission element 14.

[0032] In the design according to the Fig. In the configurations 1 to 9, each spring 15 is designed as a coil spring with two ends, with one of its two ends being in contact with the transmission element 14. For fixation, the transmission element 14, in the configurations according to the Fig. 1 to 8 two pot-shaped receiving areas 16, with each of the two coil springs having one of its two ends in a receiving area 16. For example Fig. As can be seen from Figure 6, the transmission element 14 has a pot-shaped receiving area 16 on both sides of the counter surface 13. In this configuration, the actuating device 8 acts on the receiving frame 20 on both sides of the rod and thus indirectly on the filter element 2, pressing it tightly against the contact area 7.

[0033] As the figures show, the general extension of the transmission element 14 is orthogonal to the direction of action 17 of the springs 15. Each spring 15 is oriented such that its direction of action 17 is parallel to the direction of action of the actuating device 8.

[0034] Fig. Figure 8 shows the actuating device 8 in its fixed position. In this position, the filter element 2 is pressed tightly against the contact area 7. Each coil spring, designed as a spring 15, protrudes a portion from the top of its respective pot-shaped receiving area 16, even when the actuating device 8 is in the fixed position. This ensures that the transmission element 14 does not come into contact with the receiving frame 20, even in the fixed position. Rather, only the coil spring acts on the receiving frame 20, even in the fixed position.

[0035] For example Fig. Figure 3 shows that one of the filter frame parts of the filter frame 6 has a handle 26, which, among other things, facilitates the removal of the filter element 2 from the filter housing 1. After the filter element 2 is inserted into the filter housing 1, - as Fig. As can be seen from Figure 11, a sealing element 27 is mounted from the outside by means of screws 28, so that the opening 4 in the filter housing 1 is sealed. In the illustrated embodiment, the sealing element 27 is designed as a cover and is dimensioned such that it completely closes the opening 4 and also covers and seals the 90° angled end of the actuating device 8. For removal, the actuating device 8 is located in the area shown in the Fig. 5 and Fig. The filter element 2, which has a seal 19 on its upper edge, is located at a distance A from the mounting area 7. Therefore, the filter element 2, including the filter frame 6, can be inserted into or pulled out of the opening 4, similar to a drawer.

[0036] As explained above, the mounting frame 20 is provided inside the filter housing 1. The filter element 2 is inserted into this mounting frame 20. When the actuating device 8 is moved from the removal position to the fixing position, the mounting frame 20, and thus also the filter element 2 located on it, is moved in the direction of arrow 21. This causes each spring 15 to act on the mounting frame 20 with the portion facing away from the transmission element 14. The mounting frame 20 can be moved within the filter housing 1 in the direction of arrow 21.

[0037] Once the filter element 2 has been pushed sufficiently far into the opening 4, the actuating device 8 is rotated about its axis of rotation (arrow 11). The two displacement elements 12 are also rotated in the process. Due to the eccentric bearing, the mounting frame 20 and the filter element 2 are raised in the direction of arrow 21 until the filter element 2 seals against the contact area 7. Fig. 7 and Fig. Figure 8 shows this position, namely the fixing position of the actuating device 8. As the Fig. 7 and Fig. As can be seen in Figure 8, even in the fixed position, each coil spring protrudes a portion from the top of its respective pot-shaped receiving area 16. This ensures that the transmission element 14 does not come into contact with the receiving frame 20, even in the fixed position. Instead, only the coil spring acts on the receiving frame 20, maintaining sufficient contact pressure and thus ensuring contact across the entire edge of the contact area 7. By means of the Fig. The opening 4 is closed by the externally attached closure element 27 shown in 11, which is designed, for example, as a lid.

[0038] In the Fig. 9 and Fig. Figure 10 shows two alternative embodiments. In these embodiments, the transmission element 14 is not part of a mounting frame 20 but is attached to the inside of the filter housing 1 in a manner not shown, allowing it to be moved. The springs 15 are in direct contact with the edge region of the filter element 2 and therefore act directly on the filter element 2. The embodiment according to Fig. Figure 9 has two coil springs. In contrast to the previously described embodiment, however, the transmission element 14 does not have pot-shaped receiving areas 16. Rather, one end of each coil spring is guided and thus fixed, for example, by a pin (not shown) or by a sleeve (not shown) provided on the transmission element 14.

[0039] In Fig. Figure 10 shows a variant in which only one spring 15 is provided. This spring is designed as a coil spring. The transmission element 14 has a pot-shaped receiving area 16 for receiving one end of the spring 15. On the side facing away from the spring 15, the receiving area 16 forms the mating surface 13.

[0040] Fig. Figure 9 shows the actuating device 8 in the removal position, while in Fig. Figure 10 shows the actuating device 8 in the fixing position.

[0041] For example, the Fig. 6 and Fig. As can be seen from Figure 8, each receiving frame 20 has two support elements 25 arranged at a distance from each other on its outer side. In the removal position, each transfer element 14 rests on the upper edge of two support elements 25.

[0042] For example Fig. As shown in Figure 4, the transmission element 14, together with the two pot-shaped receiving areas 16 located on either side of the counter surface 13 and the two springs 15, forms a unit that can be displaced relative to the receiving frame 20 in the direction of the contact area 7. For this purpose, each of the two units has an elongated hole that is congruent with the elongated holes 24 in the receiving frame 20. Since in Fig. In section 4 of the unit, the elongated hole in the unit is not visible. The actuating device 8 is guided through the elongated hole.

[0043] When the actuating device 8 is in its removal position, the transmission element 14 rests on the upper edge of the support elements 25. As the Fig. 4 and Fig.As shown in Figure 6, there is a distance B between the leg 22a and the underside of the transmission element 14. The distance B is slightly less than the length of the spring 15 in its uncompressed state. Thus, each spring 15 is slightly pre-tensioned, even when the actuating device 8 is in its removal position.

Claims

[1] Filter housing (1) for reversibly receiving a filter element (2), wherein the filter housing (1) has a circumferential wall (3) which preferably comprises four filter housing parts or filter housing part areas arranged at right angles to each other, wherein the filter housing (1) has a lateral opening (4) in the wall (3) for inserting or removing the filter element (2), has a circumferential, preferably linear, contact area (7) in its interior, against which the filter element (2) rests in its edge region when inserted, and furthermore provides an actuating device (8) in the interior of the filter housing (1), by means of which the filter element (2) can be moved between a removal position and a fixing position, wherein the actuating device (8) has at least one working surface (9) acting on the filter element (2),so that the filter element (2) is pressed tightly against the contact area (7) when the actuating device (8) is in the fixing position, and the filter element (2) can be inserted into the filter housing (1) via the opening (4) in the insertion direction (10) or removed from the filter housing (1) in the opposite direction to the insertion direction (10) when the actuating device (8) is in the removal position. characterized by, that at least one effective surface (9) of the actuating device (8) acts on a counter surface (13) of at least one transmission element (14), wherein at least one transmission element (14), preferably each transmission element (14), has at least one spring (15) on its side facing away from the at least one effective surface (9), which acts indirectly or directly on the filter element (2) with a partial area facing away from the transmission element (14), and that at least one spring (15) is designed as a coil spring having two ends, wherein each coil spring is in contact with the transmission element (14) at one of its two ends. [2] Filter housing (1) according to the preceding claim, characterized by , that the actuating device (8) is elongated, preferably rod-shaped, and that the actuating device (8) is rotatably mounted about its longitudinal axis for displacement between the removal position and the fixing position. [3] Filter housing (1) according to the preceding claim, characterized by , that the actuating device (8) is designed as a rod. [4] Filter housing (1) according to any one of the preceding claims, characterized by that the actuating device (8) is aligned parallel to the insertion direction (10). [5] Filter housing (1) according to any one of claims 2 to 4, characterized by , that the actuating device (8) has at least one displacement element (12), preferably designed as a disk arranged eccentrically on the actuating device (8), the outer surface of which serves at least partially as an effective surface (9). [6] Filter housing (1) according to the preceding claim, characterized by, that the actuating device (8) has two displacement elements (12) arranged at a distance from each other, wherein the distance between the displacement elements (12) is such that the two displacement elements (12) act directly or indirectly on the edge regions of two opposite sides of the filter element (2). [7] Filter housing (1) according to any one of the preceding claims, characterized by , that the end of the actuating device (8) facing the opening (4) is designed as a handle or has a handle. [8] Filter housing (1) according to any one of the preceding claims, characterized by , that the transmission element (14) for fastening at least one coil spring has at least one pot-shaped receiving area (16), wherein at least one coil spring is located with one of its two ends in a receiving area (16), preferably clamping. [9] Filter housing (1) according to the preceding claim, characterized by, that the transmission element (14) has at least one pot-shaped receiving area (16) on both sides of the opposite surface (13). [10] Filter housing (1) according to one of claims 8 or 9, characterized by , that at least one coil spring protrudes from the top of the respective pot-shaped receiving area (16) when the actuating device (8) is in the fixing position. [11] Filter housing (1) according to any of the preceding claims, characterized by , that inside the housing of the filter housing (1) a receiving frame (20) is provided, on which at least one transmission element (14), preferably all transmission elements (14), is provided, wherein the receiving frame (20) can be moved in the direction of the application area (7) by means of the actuating device (8). [12] Filter housing (1) according to the preceding claim, characterized by, that the receiving frame (20) consists of two parallel and preferably U-shaped profiles (22) arranged at a distance from each other and of two angle profiles (23) arranged at right angles to the profiles (22) and also parallel to each other. [13] Filter housing (1) according to the preceding claim, characterized by , that at least the profile (22) facing the opening (4) in the installed state, preferably both profiles (22), is (are) U-shaped and that at least the profile (22) facing the opening (4) in the installed state, preferably both profiles (22), each has a leg (22a) facing the contact area (7), a leg (22b) facing away from the contact area (7) and a web (22c) connecting the legs (22a and b). [14] Filter housing (1) according to any one of claims 11 to 13, characterized by, that the transmission element (14) can be displaced relative to the receiving frame (20) in the direction of the installation area (7). [15] Filter housing (1) according to the preceding claim, insofar as it refers back to claims 8 to 10, characterized by , that the transmission element (14) forms a unit with the at least one pot-shaped receiving area (16) and the at least one spring (15), wherein the unit has an elongated hole which is oriented in the direction of the contact area (7). [16] Filter housing (1) according to any one of claims 11 to 15, characterized by , that at least the filter housing part facing the opening (4) or the filter housing part area of ​​the receiving frame (20) facing the opening (4) has at least one support element (25) on which the transmission element (14) rests when the actuating device (8) is in the removal position. [17] Filter housing (1) according to any one of claims 11 to 16, characterized by , that the receiving frame (20) has at least in one of the two profiles (22), preferably in both profiles (22), an elongated hole (24) which is oriented orthogonally to the longitudinal extent of the respective profile (22) and which is preferably arranged centrally with respect to the longitudinal extent of the respective profile (22). [18] System comprising a filter housing (1) according to one of the preceding claims, a filter element (2) having a filter frame (6) and a closure element (27), preferably of a planar design, wherein the closure element (27) in the fixing position of the filter frame (6) seals the opening (4) in the filter housing (1).

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