FR2700123A1 - Mounting of filters for air distribution units - Google Patents

Abstract

A sealed mounting for filters placed at air extraction or distribution points of rooms or areas comprises a frame (1) supporting a filtration section (2) and a protective grill (3).The frame (1) is mounted and fixed to a second frame (4) which is rendered mobile by screws (5) connected directly or indirectly to the tightening plane (6) allowing advance or retraction of the frames (1,4) from the unit.

Description

The present invention relates to the design of a sealed filter mounting device.

Certain filters must be placed at the diffusion or at the extraction of air for the particulate and biological control of clean rooms or volumes.

The air indeed contains a large quantity of particles and microorganisms which can constitute contamination by their undesirable presence in a surface or in a protected space. These particles and these microorganisms can cause a qualitative or quantitative disturbance of a precise operation in which the surface or con tamined space intervenes. This disturbance can reveal itself immediately or reveal itself thereafter.

In the electronics industry, particles can enter the production cycle and affect the proper functioning of micro components. In the hospital, microorganisms can reach patients at high risk of infection.

Controlling contamination in an industrial environment as in the health sector, involves the elimination of particles present in the air to form clean rooms or volumes.

To ensure the elimination of these particles or these microorganisms, filters are generally used which act in successive stages and according to the size of the particles. These filters are most often presented in panels to be placed either in an air network, or on openings arranged in the walls and connected to a network.

It is this latter arrangement which is generally adopted for rooms or volumes subjected to a particulate or biological air control: the filters placed on a pressure network and on the air diffusion on the one hand and on a network in depression and air extraction on the other hand. The first make it possible to eliminate ultra fine particles of the order of a micro meter during blowing and to ensure clean or so-called "sterile" air in the space concerned; the second make it possible to avoid entrainment in the circuits, particles coming from the activity of this space
In fact, the efficiency of the system in general and of filtration in particular, can only be ensured if the mounting of these filters is sealed.

Furthermore, because of their positions, these filters must be protected against shocks and this protection must also have a role of air distributor. As part of the operation of the installation, these filters are subject to frequent disassembly for replacement as soon as the particle load is high. If the sealing of the filtration panels is not constantly ensured, in particular with the diffusion of air, there is a risk of contamination and operational insecurity.

The device according to the invention makes it possible on the one hand to ensure the tightness of the mounting of the filters placed at the diffusion or at the extraction of air for clean rooms or volumes, on the other hand a protection of the filtration plan and an improvement in the use of filters.

According to FIG. 1, it in fact comprises a profiled frame (1) serving to support both the filter panel (2) and a protective grid (3) which may have the structure of a mesh. This frame is mounted and fixed on another profiled frame (4) and provided with bolts (5) inserted into the material (6) by a tapping or by a nut (7) constituting the opening communicating with the air network.

The rotation of the bolts (5) causes the mobility of the two frames and the tightening and loosening of the filter panel (2). The support frame of the filter panel (1) can be mounted and screwed on the mobile frame (4) or better be mounted on a hinge (8) allowing its opening for faster replacement of the filter panel (2).

Figure 1 shows in partial section the device according to the invention.

Figure 2 shows in section the whole device with representations of the mobility and articulation of the frame (4)
Figure 3 shows in section the device integrated into a square or rectangular section duct according to one of its possible applications.

Figure 4 shows in section the device integrated into a triangular section conduit according to one of its possible applications.

FIG. 5 shows in section, the device integrated into a trapezoidal section duct according to one of its possible applications.

FIG. 6 represents the front face of the device integrated into a conduit according to one of its possible applications.

The device shown in Figure 1 comprises a frame (1) whose profile has the shape of a tee with unequal wings provided on its foot and inwardly of the frame of a lug. The part of the frame (1) formed by the foot of the tee allows to fit and support a filter panel (2), the part of the frame (1) formed by the lug and the small wing of the tee can optionally receive a grid structured in mesh (3).

This frame (1) is supported by the large wing of the tee and on its exterior, on another frame (4) whose profile may have a preferential rectangular section or, alternatively, square or "U" shaped. Bolts (5) pass through the frame (4) provided with retaining clips (9) and pivot in a nut (7) inserted on the body or the connection of an air duct (6).

 The frame (1) and the frame (4) are linked by fixings arranged on the large wing of the frame (1). Access to the head of the bolts (5) is provided by holes (10) arranged on the large wing of the frame (I). The rotation of the bolt (5) makes it possible to tighten or loosen the filter panel (2) comprising a seal (11) and housed in the frame (1).

In the embodiment of the device according to Figure 2, the frame (1) can be mounted on hinges.

The device according to the invention is particularly intended for mounting filters for rooms and volumes under particulate and biological air controls.

Claims (4)

1) A sealed assembly device for filters placed at the diffusion or at the extraction of air from clean rooms or volumes characterized in that it comprises a frame '(1) making it possible to receive a filtering panel (2) and a protective grid (3), this frame being mounted and fixed in another frame (4) made mobile by screws (5) connected directly or indirectly to the clamping plane (6) and allowing the advancement or retreat of the set of 2 frames (1) and (4).  2) Device according to claim 1 characterized 'in that the frame (1) comprising the filter panel can receive a grid structured in mesh (3). 3) Device according to claim 1 characterized in that the mobility of the frame (4) is ensured by screws (5) held therein by clips (9) 4) Device according to claim (1) and or any one of the preceding claims, characterized in that the frame (1) can be mounted on hinges on the frame (4).