CZ2011538A3 - Cam locking device for holding static filtration panels in a filter-holding frame - Google Patents

Abstract

The filter holder assembly includes at least one frame with a peripheral wall (12, 14, 16, 18) and a peripheral edge (20, 22, 24, 26) extending inwardly substantially perpendicular to the peripheral wall and adapted to support the filter (32). At least one cam lock lever (36) is secured to the peripheral wall at a first, predetermined distance from the peripheral edge facing inwardly for compressing the filter in the frame and against the peripheral edge facing inward. The cam lock lever (36) has a grip portion (38) at one end thereof and a cam head with a bag base (42) at its opposite end. The cam lock lever (36) is pivotable to cause the cam foot (42) to move between the open position and the clamping position, where the cam foot (42) exerts a compressive force on the filter (32).

Description

(57)

The filter holder assembly comprises at least one frame with a peripheral wall (12, 14, 16, 18) and an inwardly peripheral edge (20, 22, 24, 26) substantially perpendicular to the peripheral wall and adapted to support the filter (32). The at least one cam lock lever (36) is secured to the peripheral wall at a first, predetermined distance from the peripheral inward facing edge for the filter filter in the frame and against the inward peripheral edge. The cam lock lever (36) has a deflecting portion (38) at one end thereof and a cam head with a cam foot (42) at the opposite end thereof. The cam lock lever (36) is rotatable to cause the cam foot (42) to move between an open position and a clamping position where the cam foot (42) exerts a compressive force on the filter (32).

JUDr. Otakar Švorčík Attorney at Law 120 00 Praha 2, Hálkova 2

Cam locking device for holding static filter panels in the filter holding frame

Technical field

The invention relates to turbine air filter systems and more particularly to a filter holding frame assembly comprising a device for holding one or more filters in an adjacent frame.

BACKGROUND OF THE INVENTION

Gas turbines used to generate energy are often located in industrial areas near other combustion sources where the local atmosphere may contain high levels of small particles such as carbon. Power plants can also be located in deserts and other dry environments where high levels of particles such as sand can also significantly impair turbine performance. Therefore, it is crucial that the intake air filter systems are optimized to minimize the negative impact on turbine performance due to particulate air,

In the past, filters were held in their respective holding frames in different ways. For example, the raising and lowering method is used in cases where the holding frame consists of horizontal profiles, the top profile being deeper than the bottom profile. This allows the filter to be inserted into the top profile and then lowered into the bottom profile. The advantage of this method is the simplicity and absence of staples

93798 (2493798_EN.doc) 2.9. 2011 and / or terminals. But the sealing of the filter and its frame is based on the air flow through the filter, creating a force that compresses the filter seal. As a result, the seal is not 100% effective. Furthermore, this method is not suitable for face panel filters due to the weight of typical pocket filters. A spring clip method is also used, in cases where four (4) spring clips are located at respective corners of each filter to ensure a more reliable compression of the filter seal. However, this method is more complex and costly and the spring clips are not robust. Another technique uses a screw clamp located at each corner of the filter to compress the filter seal. Effective compression of the seals can be achieved but difficult to confirm. With this technique, removing and replacing filters is a time-consuming process due to the length of screws used. The screws also present a potential health and safety risk by protruding from the retaining frame. Furthermore, none of the above methods is suitable for holding and sealing back pocket filters placed in one frame assembly.

SUMMARY OF THE INVENTION

According to a first but non-limiting exemplary embodiment, there is provided a filter holder assembly comprising at least one frame with a peripheral wall and a peripheral edge facing inwardly substantially perpendicular to the peripheral wall and adapted to support the filter, at least one cam lock lever secured to the peripheral wall in a first predetermined distance from the inward peripheral edge to compress the filter in the frame and against the inward peripheral edge, wherein the cam lock lever has a grip portion at one end thereof and a cam head with a heel (2493798_EN.doc) 2.9.2011 end, wherein the cam lock lever is pivotable to cause cam foot movement between the open position and the clamping position, wherein in the cam foot clamping position the compressing force is applied to the filter.

In another aspect, the invention relates to a filter holder assembly comprising a plurality of frames in a grid substantially planar, each of the plurality of frames defined by the peripheral wall comprising two pairs of substantially parallel side walls and a peripheral edge facing inwardly adapted to support the filter. one group of four adjacent frames where the four converging side walls of the four adjacent frames respectively intersect to define four corner quadrants, and wherein each of the four converging side walls is common to two of the four adjacent frames, the peripheral the wall has a height sufficient to support two superimposed filters, each of the four corner quadrants having a first cam lock lever secured by a pivot to one of the four converging side walls at a first predetermined distance from the inward peripheral edge to clamp one of the two filters against the inward peripheral edge i and the second cam lock lever secured by a pivot to one of the adjacent four side walls at a second predetermined distance from the inward peripheral edge for clamping the second of the two filters against the first of the two filters, each cam lock lever comprising a gripping portion at one end thereof and a cam head at the opposite end thereof, wherein the lever is rotatable to cause cam foot movement between the open position and the clamping position wherein the cam head exerts a compressive force on the respective of the filters.

(2493798_EN.doc) 9/2/2011 • · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · «·« · · · · · · · · · · · · · · ·

In another further aspect, the invention relates to a cam lock lever for holding a filter in a filter frame comprising an elongated grip portion at one end and a substantially circular cam head at the opposite end, wherein the cam foot extends laterally away from the substantially circular cam head.

The invention will now be described in conjunction with the drawings below.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a single filter frame in accordance with a non-limiting embodiment of this FIG. 2; FIG. 3; FIG. 4 of the invention;

a bottom view of the filter frame shown in Figure 1;

a cross-section along line 3-3 in Figure 1;

a side view of the frame shown in Figure 1;

Figure 5 is a cross-sectional view taken along line 5-5 of Figure 1 but with the filter fitted and the cam lock lever installed;

(2493798_EN.doc) 02/09/2011 • ·

picture 6 a partial section with the filter frame shown in Figure 5 rotated ninety degrees, showing the cam lock lever in the locked and unlocked (dashed) position; picture 7 a side view of a cam lock lever according to a non-limiting embodiment of the present invention; picture 8 side view of cam lock lever shown in Figure 7; picture 9 a cross-section similar to Figure 5, but showing another exemplary embodiment, wherein the back-to-back cam lock levers are used to clamp adjacent filters within a multiple filter frame assembly; picture 10 a cross-section similar to FIG. 5, but showing another exemplary embodiment, wherein two filters are stacked one behind the other and clamped by a pair of cam lock levers having an angle of ninety degrees therebetween; picture 11 a partial perspective view of the stacked filters arrangement shown in Figure 10;

Figure 12 is a partial cross-sectional view showing an alternative rotatable attachment of the cam lock lever arrangement;

(2493798_EN.doc) 2.9.2011> «Figure 13 a side view showing the tool used for ramming the pivot pin shown in Figure 12 and Figures 14Ά and 14B, and a side view showing a control handle or tool for use with the cam lock lever respectively shown in the various figures.

DETAILED DESCRIPTION OF THE INVENTION Holding Side Shape

Referring first to Figures 1-4, the filter frame 10, in a non-limiting exemplary embodiment, is substantially square with two pairs of substantially parallel walls 12, 14, 16 and 18. Horizontal support flanges 20, 22, 24 and 22 are provided at respective lower edges of the walls. 26 for supporting a substantially filter as described planar and substantially square, both the walls 12 and the slots 30 are realized.

approximately 73 mm are placed The illustrated filter frame of a pair of lock case in the next. Opposite side walls 14 and 18 with a pair of apertures 28, wherein the side realized with a pair of apertures or embodiments are apertures 28 positioned with apertures 30 at the bottom edge of the walls, a single filter or

In the latter, the cam support devices are both

In the example, from the lower edge e of the walls, approximately 43 mm above, it is intended to be stacked.

there are 28 different heights in the holes

22, 24 and 26 as described below.

relative to bearing flanges 20 ₁

The position of the holes may, of course, vary depending on the particular application.

Figure 5 of the filter 32, which illustrates a substantially square portion, has a resilient seal 34 used around the lower peripheral edge of the filter.

The filter is supported on the lower horizontal support flanges 20, 22, and 26 of the filter holding frame 10.

Figure 5 also illustrates a cam lock lever 36 mounted by a pivot pin 35 in one of the holes 30 of the filter holding frame 10. Referring to Figures 7a, the cam lock lever 36 includes an extended grip portion 38 at one end and a substantially circular cam head 40 at the opposite end. The cam head 40 attaches (or is formed by) a longitudinally extending cam heel 42 that is generally aligned with the longitudinal axis of the lever 36. The cam heel 42 is formed to include a lateral extension 44 positioned axially behind the rounded surface of the head 40 the cam by means of a band 45 and is realized at one or both ends with a beveled or upwardly facing edge 46, the purpose of which will be described later. The mounting hole or cutout 50, also aligned with the longitudinal axis of the lever, is located at the center of the cam head 40.

The cutout 50 is adapted as illustrated in Figure 5 to receive the pivot pin 35 by which the cam lock lever 36 is rotatably mounted to the frame 10 via an opening 30.

With particular reference to Figures 5 and 6, it will be appreciated that the positioning of the holes 30 in the side walls 12 and 16 of the holding frame is selected such that the cam lock levers 36 can move between the open and clamping positions. 6, for example, and wherein the cam heel 42 rotated 90 degrees to the clamping position engages the top surface 52 of the filter 32 with a bevelled or upwardly facing edge 46, thereby ensuring smooth engagement with the filter in the rotational direction and then compress the filter 32 and the gasket 34 against the horizontal support flange 20 to clamp and seal one corner of the filter 32 in place in the retaining frame. Je (2493798_EN.doc) 02/09/2011 · * - * - · «« «« «« «-« «« «« 249 249 249 249 249 249 249 249 It should also be noted that the cam lock lever 36 is formed by an offset 48, which can best be seen from Figure 5, and which provides a space between the frame holding side wall 12 and the gripping portion 38 to reduce friction and allow gripping and pivoting of the gripping portion 38. It will be appreciated that the cam lock levers 36 can be installed in each of the four corners of the filter using the four attachment holes 30 as shown in Figures 1-4.

In an alternative arrangement in Figure 9, the filter holding frame assembly includes adjacent filter holding frames 10, 110 formed by a partially conventional double-thickness side wall 112. In this embodiment, the second cam lock lever 136 can be installed with the first lever 36 but at the opposite end of the side wall 112. The extended pivot pin 35 allows a double cam lock lever assembly. Thus, one double cam lock device can be used to separately grip the two adjacent filters 32, 132 and their respective seals 34, 134 on adjacent supporting surfaces 20, 120 in adjacent holding frames 10, 110.

It will be appreciated that the filter holding frame assembly may be enlarged to accommodate, for example, a planar grid that includes one or more groups of four adjacent filter frames where the four side walls converge to intersect, defining four corner quadrants of the respective four adjacent frames. Each of the four intersecting side walls is common to two of the four adjacent frames. If desired, one, two or all four side walls can be secured by a double cam lock lever arrangement as described above near the intersection. This arrangement may be repeated throughout the grid as desired.

(2493798_EN.doc) 2.9.2011

It will be appreciated, however, that the present invention is not limited to any particular holding frame arrangement.

Figure 12 shows an alternative embodiment of a pivot pin particularly useful in the multiple cam lock lever arrangement of Figure 1

9.

The pivot pin 52 includes a first pivot element 54 that is received in the second pivot element 56.

When attaching the lever

36,

136, a pivot assembly from opposite sides of the holding frame wall is installed, and the tool 60 is then used to ram the hollow end of the first pivot element 54 radially outwardly into the locked engagement with the bevelled edge 62 of the second pivot element 56, 36 of the cam lock so as to be permanently attached to the wall of the holding frame.

In another exemplary embodiment, as best seen in Figures 10 and 11, a pair of filters 32, 232 may be stacked, in which case the additional cam lock levers 64, 164 of the single holding frame 10 may be secured through vertically spaced openings 28 on the side walls. 14, 18 holding the frame and use it to clamp the second or stacked filter 232 in substantially the same manner as described above. It will be appreciated that the cam lock levers mounted in the apertures 30 extend substantially 90 degrees relative to the cam lock levers mounted in the apertures 28. Thus, four cam lock levers for clamping the corners of the bottom or downstream filter 32 can be used for the configuration, and four cam lock devices can be used for clamping the corners of the upper or upstream filter 232 but arranged at 90 degrees relative to the cam filter levers.

(2493798_EN.doc) 2.9.2011 • ♦

This arrangement allows the upper or upstream filters 232 to be removed from the filter holding frame, while the lower or downstream filter 32 lying down remains tight and sealed in the holding frame. This is important in that any particles released due to removal / replacement of the upstream filter will not pass through the downstream filter, and keeping the downstream filter clamped and sealed does not release any particles in the downstream filter.

As can be seen from Figure 11, the stacked filters 32, 132 are shown in one of four partially illustrated, mutually perpendicular filter frames. It will be appreciated that dual cam lock lever devices can also be used herein to advantageously lock the filters in respective adjacent frames with a double cam lock lever secured to each of the four intersecting side walls of the holding frames as described above.

Another feature of the invention is that the cam lock levers and the side wall of the holding frame are realized with cooperating protrusions and stops to prevent inadvertent movement of the cam lock levers from either an open or a closed (i.e., clamped) position. More specifically, the stops 66 (Figure 11) are realized in the side walls of the holding frame where they are engaged by protrusions 68 that are punched or otherwise formed in the cam lock levers 32, 232 in both the open and closed (or clamped) positions. Other substantially equivalent means may also be used to perform the hold or lock function.

Figure 13 illustrates the tool rack assembly 70 used to support the tool 60 used for deformation (2493798_EN.doc) 2/9/2011 The pivot pin assembly 52 shown in Figure 12. The tool 60 can be aligned along the vertical and horizontal shafts 72, 74 for positioning. tools 60 as desired. At the same time, the frame 112 is held in a U-shaped support frame 76. In this view, it should be noted that the individual cam lock levers are only partially shown.

Now move the cam to the image

14, a lock or tool with a distal end extended where the control handle lever

8, the cam lock portion 38 can be slidably engaged to allow rotation. The tool 78 a hollow sleeve that comprises a first portion 80 generally coaxial with handle portion 38 and the angular lever interconnect 36 includes a portion 82 which is _f which extends angularly away from the first portion 80. The angled portion 82 provides a gripping surface more favorable to the user, since the cam lock lever is rotated between its open and closed (or clamped) positions.

While the invention has been described in connection with what is now considered to be the most practical and advantageous embodiment, it should be understood that the invention should not be limited to the disclosed embodiment, but on the contrary intends to cover various modifications and equivalent arrangements as included within the spirit and scope of the appended claims.

Claims (7)

PATENT CLAIMS A filter holder assembly comprising at least one frame (10) with a peripheral wall (12), (14), (16), (18) and an inwardly facing periphery (20), (22), (24), (26) substantially perpendicular to the peripheral wall and adapted to support the filter (32), at least one cam lock lever (36) secured to the peripheral wall at a first predetermined distance from the peripheral edge facing inwards to compress the filter in the frame and against the peripheral edge i inwardly, the cam lock lever (36) having a grip portion (38) at one end thereof and a cam head (40) with a cam heel (42) at the opposite end thereof, wherein the cam lock lever (36) is rotatable to cause heel movement (42) a cam between an open position and a clamping position, wherein in the clamping position the cam foot (42) exerts a compressive force on the filter (32). The filter holder assembly of claim 1, wherein the peripheral wall of the frame comprises two pairs of substantially parallel side walls (12), (14) and (16), (18) defining four corners, and wherein opposite ends of each side wall of at least one of two pairs of substantially parallel side walls are realized with one of the cam lock levers (36). The filter holder assembly of claim 1, wherein the cam lock lever (36) is secured to the peripheral wall by a pivot pin comprising first and second pin members (54), (56), wherein the first pin member (54) is deformed into a locked engagement with the pivot. a second pin element (56). 24 93798 (2493798_EN.doc) 02/09/2011 • · 4. Sestava filter holder according to claim 1 where heel (42) has cams at least one awake . rotated edge (46). 5. Sestava filter holder according to claim 1 where heel (42) cams has upside-down edges (46) on their opposite ends. 6. Sestava filter holder according to of claim 1, wherein úchytná the portion (38) is provided with a control tool (78) with a first portion (80) extending across the grip portion and a second portion (82) extending angularly away from the distal end of the grip portion. The filter holder assembly one (110) adjacent the frame (10) includes matched at least holding and wherein the cam lock self-rotatable according to claim 1, wherein at least two adjacent frames of the filter pair (32), (35) support (10), (132) a lever and an additional double end circumferential for the pivot formed by the lever (36) by a lever (136) on the opposite wall, each lever adapted to clamp one of the adjacent filters (32) to the respective of at least two adjacent frames. The filter holder assembly of claim 1, wherein the at least one frame comprises multiple frames in an aligned, substantially planar group (Figure 11) adapted to hold a plurality of identical filters, the group defining at least one corner intersection of four side walls of four different frames and wherein one The dual cam lock levers (32), (232) are supported on at least two of the four side walls, near the at least one corner. (2493798_EN.doc) 9/2/2011 • · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · The filter holder assembly of claim 2, wherein the peripheral wall (12), (14), (16), (18) has a height sufficient to support two superimposed filters (32), (232), and wherein opposite ends of each side the walls of the remaining pair of substantially parallel side walls are realized by one of the cam lock levers (164) (164) secured by pivot pins at a second predetermined distance from the peripheral edge (20), (22), (24), (26) ) directed inwardly greater than the first predetermined distance. The filter holder assembly of claim 1, wherein the gripping portion and the peripheral wall are implemented by means (66), (68) for holding the at least one cam lock lever in the open position and in the clamping position.