Return guide device

Abstract

Return guide device (1) for a filter element (2), such as a filter cartridge or a bag filter, for cleaning air from a machining and / or processing machine, in particular from the machining area of ​​a machine tool, and for filtering out particles, such as dust, chips or the like, from the air by means of filter material, with the function of discharging warm air from the filter element (2) and the additional function of discharging a compressed air wave in the event of an explosion in the filter element (2) wherein the return guide device (1) is designed to direct the air flowing from the filter element in an airflow (S) with an airflow direction (r), wherein the return guide device (1) has at least one steering module (3), wherein the steering module (3) is designed as a hollow body, wherein the steering module (3) is designed to deflect air (L) from a first airflow direction (r1) into a second airflow direction (r2), wherein the second airflow direction (r2) is pivoted by 90° relative to the first airflow direction (r1), characterized in that the steering module (3) has at least two deflection points (4), wherein the steering module (3) is configured to deflect the airflow direction (r) at at least two deflection points (4) of the steering module (3) through which the airflow (S) passes, by a deflection angle (α) greater than 0° and less than 90°.

Description

[0001] The invention relates to a return device for a filter element, such as a filter cartridge or a bag filter, for cleaning air from a machining and / or processing machine, in particular from the machining area of ​​a machine tool, and for filtering out particles, such as dust, chips or the like, from the air by means of filter material according to the preamble of claim 1. State of the art

[0002] During the processing and finishing of wood, paper, or plastics, dust, chips, or other particles are generated. These particles are typically extracted from the processing machines that generate them and pneumatically transported away using an air stream, for example, to a filter system. Air return devices, such as piping systems or hose systems, are typically used to transport the dust, chips, and other particles to the filter and to further direct the return air downstream of the filter system.

[0003] At the same time, the air return devices serve to remove warm air from the filter element and, in the event of an explosion in the filter element, to remove a compressed air wave from the filter element.

[0004] In practice, these air return devices are often implemented using box-shaped hollow modules, as these can be installed in a space-saving and easy manner despite the large flow volume. Object and advantages of the invention

[0005] The object of the invention is to propose a return device that can be operated more efficiently and at the same time more safely.

[0006] This object is achieved by the features of claim 1, starting from a return device of the type mentioned in the introduction. Advantageous embodiments and further developments of the invention are possible by the measures mentioned in the subclaims.

[0007] Accordingly, a return device according to the invention is characterized in that the steering module has at least two deflection points, wherein the steering module is designed to deflect the air flow direction at at least two deflection points of the steering module, which the air flow passes, by a deflection angle greater than 0° and less than 90°.

[0008] The air return device according to the invention serves, as already described, to discharge warm air from the filter element and, in the event of an explosion in the filter element, to discharge a compressed air wave from the filter element.

[0009] The advantage of this is that less turbulence is created within the air flow and less energy is required to transport the air flow through the return device.

[0010] In this way, direct pressure decoupling can also be achieved, thus increasing the safety aspect of the system.

[0011] The steering module and / or the return device can, for example, be made entirely or at least predominantly of metal or sheet metal. This can offer the advantage that the steering module or the return device can be designed to withstand the pressure and temperature of the air being guided.

[0012] For example, the steering module and / or the return device are part of a return air or exhaust air duct. It is also conceivable that the steering module and / or the return device form the return air or exhaust air duct.

[0013] Preferably, the deflection points are designed with obtuse angles, so that the air flow is deflected only by a small angle. This way, the air is deflected only slightly at each deflection point, so that flow resistance is low and major turbulence and thus flow drops can be avoided. A greater deflection can be achieved by connecting several such deflection points in series or continuously via a rounded section.

[0014] It is conceivable that two or more deflection points are present within a certain area or distance along a steering module. In one possible embodiment, the two or more deflection points are arranged such that one corner of the steering module is flattened. For example, two or more deflection points form a corner of the steering module. For example, the air flow can be deflected by a total of 90° at two or more deflection points instead of at a single 90° corner of the steering module, in order to reduce turbulence in the air flow.

[0015] Preferably, the consecutively arranged deflection points or the continuous deflection within a steering module result in a 90° deflection of the airflow. This allows multiple steering modules to be easily mounted one behind the other, either directly or indirectly in series, and the airflow can be guided through these steering modules. The 90° deflection of the airflow allows the return device to be installed in a space-saving and compact manner.

[0016] A design of the return device is conceivable in which at least one steering module is rounded in the direction of the airflow between two of the deflection points. This rounded shape redirects the airflow less abruptly, but more continuously, thus further reducing turbulence. A design in which a round shape is approximated by several small deflections is also conceivable. This can be achieved by using several deflection points with obtuse angles and thus small deflection angles. A design in which the curve is oval is also conceivable.

[0017] It is conceivable that the at least one steering module is designed in cross-section as a ring sector or a circular sector. For example, the sector is present as a quarter of a circle or a ring. For example, the sector angle of the ring sector or the circular sector is 90°. It is also conceivable that the inner arc and / or the outer arc of the ring sector or the circular arc of the circular sector is oval, or that an approximately round shape is present through several deflection points with obtuse angles and small deflections and straight sections between the deflection points.

[0018] For example, the at least one steering module has an inlet side and an outlet side, wherein the air flow can be directed into the steering module through the inlet side and out of the steering module through the outlet side, wherein the inlet side and / or the outlet side have an opening with a round and / or polygonal opening area. For example, the inlet side and / or the outlet side have an opening with a circular, oval, or rectangular base area. However, different shapes on the inlet side and outlet side are also possible.

[0019] Preferably, a bursting element is provided on the return device to reduce pressure in the event of excess pressure in the return device. For example, the bursting element is designed as a bursting disc. It is conceivable that the bursting element is provided on the steering module. It is conceivable that the bursting element is provided on the outside of the steering module, in particular in the region of one or more deflection points, for example, on a rounded side of the steering module.

[0020] For example, the bursting element is located on a rounded surface on the steering module. It is conceivable, for example, that the bursting element itself is also rounded, in particular, that it is equally rounded as the rounded surface on which the bursting element is located. In this way, the bursting element forms a homogeneous wall with the steering module to guide the air flow.

[0021] Ideally, the return air system comprises at least two deflection modules. This allows for a double 90° deflection, for example, which can achieve direct pressure decoupling of the return air ducts. This design thus increases the safety aspect of the system.

[0022] Preferably, the at least two steering modules are connected in series. Thus, the at least two steering modules can be arranged directly or indirectly one behind the other as a channel. For example, a spacer module can be arranged between two steering modules. The at least two steering modules can be arranged such that the air flow is guided through both steering modules.

[0023] In a preferred embodiment, the at least two steering modules are connected in series and arranged such that the air flow after the second steering module is in the same direction as the first air flow direction, but continues to flow offset from the original air flow. For example, the at least two steering modules are arranged such that the air flow direction at the outlet from the steering modules is parallel to the original direction of the air flow upon entry into the steering modules. An arrangement of the steering modules is also conceivable in which the air flow direction at the outlet from the steering modules is in the same direction as the original direction of the air flow upon entry into the steering modules, but the flow direction is opposite.

[0024] A possible design is one in which two steering modules are formed as a single piece. This reduces installation effort, allowing the return device to be constructed more efficiently. Character description

[0025] An embodiment of the invention is shown in the drawing and is explained in more detail below with reference to the figures.

[0026] In detail: Fig. 1 an exploded view of a return device according to the invention with a filter element, Fig. 2 schematically shows a possible design of a steering module with two deflection points, Fig. 3 schematically shows a possible design of a steering module with two deflection points and a rounded side between the deflection points, Fig. 4 another possible design of a steering module with two deflection points and a rounded side between the deflection points and Fig. 5 a schematic perspective view of a return device with a filter element according to Fig. 1.

[0027] In Fig. Figure 1 shows an exploded view of a return device 1 according to the invention with a filter element 2. The exhaust air is guided in the form of an air stream S from the filter element 2 through an opening 7 into the return device 1. The return device 1 shown comprises two steering modules 3, each of which has a bursting element 8 arranged on it.

[0028] Fig. Figure 2 schematically shows a possible embodiment of a steering module 3 with two deflection points 4, wherein the wall region of the steering module 3 between the two deflection points 4 is formed as a straight surface. The steering module 3 is designed such that an air flow S is guided into the steering module 3 through an opening 7 on the inlet side 5 with a first air flow direction r1 and is deflected at a deflection point 4, which has an angle β, by a deflection angle α into an air flow direction r.

[0029] The angles β or deflection angle α can be different at the different deflection points 4; in the embodiment shown, the deflection angles α of all deflection points 4 add up to 90°, so that the air flow S is present at the outlet side 6 in a second air flow direction r2 perpendicular to the first air flow direction r1.

[0030] In Fig. Figure 3 schematically shows a possible embodiment of a steering module 3 with two deflection points 4, in which the side surface between the deflection points 4 is rounded. In this way, the air flow S is deflected at many deflection points 4 with very small deflection angles α on the rounded side surface or continuously within the curve.

[0031] At Fig. 4, the deflection points 4 are located virtually directly in the area of ​​the inlet side 5 and the outlet side 6 of the deflection module 3, while the side surface in between is rounded. The deflection module 3 is designed here as a type of ring sector, with the inner arc in the illustrated embodiment not being round, but rather angular. In a possible embodiment not shown, the inner arc could also be rounded. In a shape also not shown, the inner arc and the outer arc of the circular sector could be angular.

[0032] Fig. 5 shows schematically a perspective exploded view of a return device 1 with a filter element 2 according to Fig. 1, in which the bursting elements 8 are arranged directly on the steering modules 3. List of reference symbols 1 return device 2 filter element 3 Steering module 4 Deflection point 5 Entrance side 6 Exit side 7 Opening 8 Bursting element S Airflow r airflow direction r1 first airflow direction r2 second airflow direction α deflection angle β angle

Claims

[1] Return device (1) for a filter element (2), such as a filter cartridge or a bag filter, for cleaning air from a machining and / or processing machine, in particular from the machining area of ​​a machine tool, and for filtering out particles, such as dust, chips or the like, from the air by means of filter material, with the function of discharging warm air from the filter element (2) and the additional function of discharging a compressed air wave in the event of an explosion in the filter element (2) wherein the return device (1) is designed to guide the air flowing out of the filter element in an air flow (S) with an air flow direction (r), wherein the return device (1) has at least one steering module (3), wherein the steering module (3) is designed as a hollow body, wherein the steering module (3) is designed to deflect air (L) from a first air flow direction (r1) into a second air flow direction (r2), wherein the second air flow direction (r2) is pivoted by 90° relative to the first air flow direction (r1), characterized by in that the steering module (3) has at least two deflection points (4), wherein the steering module (3) is designed to deflect the air flow direction (r) at at least two deflection points (4) of the steering module (3), through which the air flow (S) passes, by a deflection angle (α) greater than 0° and less than 90°. [2] Return device (1) according to claim 1, characterized by that the sum of the deflection angles (α) of all deflection points (4) of a steering module (3) is 90°. [3] Return device (1) according to one of the preceding claims, characterized bythat the at least one steering module (3) is rounded in the air flow direction (r) between two of the deflection points (4). [4] Return device (1) according to one of the preceding claims, characterized by that the at least one steering module (3) is designed in cross section as a ring sector or circular sector. [5] Return device (1) according to one of the preceding claims, characterized by in that the one steering module (3) has an inlet side (5) and an outlet side (6), wherein the air flow (S) can be guided through the inlet side (5) into the steering module (3) and through the outlet side (6) out of the steering module (3), wherein the inlet side (5) and / or the outlet side (6) have an opening (7) with a round and / or polygonal base area. [6] Return device (1) according to one of the preceding claims, characterized bythat a bursting element (8) is provided on the return device (r) to reduce the pressure in the event of excess pressure in the return device (1). [7] Return device (1) according to one of the preceding claims, characterized by that the bursting element (8) is present on a rounded surface of the steering module (3). [8] Return device (1) according to one of the preceding claims, characterized by that the return device (1) comprises at least two steering modules (3). [9] Return device (1) according to claim 8, characterized by that the at least two steering modules (3) are connected in series. [10] Return device (1) according to claim 8 or 9, characterized by that the two steering modules (3) are connected in series and arranged so that the air flow (S) after the second steering module (3) is in the same orientation as the first air flow direction (r), but continues to flow offset from the original air flow (S). [11] Return device (1) according to one of claims 8 to 10, characterized by that the two steering modules (3) are formed in one piece.

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