US2489915A - Loewenheim - Google Patents

Description

E. LOEWENHEIM HINGED TYPE FLUE DAMVPER WITH AUXILIARY CLOSURE Filed June 12, 1945 3 Sheets-Sheet 2 Nov. 29, 1949 E. LOEWENHEIM HINGED TYPE FLUE DAMPER WITH AUXILIARY CLOSURE 3 Sheets-Sheet C5 Filed June 12, 1945 l" L0 @merz/he mf WMVA/Q Patented Nov. 29, 1949 orf-ICE HINGED TYPE liLUE 'DAMPER WITH AUX-ILIARY CLOSR Ernst Loewenheim, London, England Application June1`2, 1945, Seral No.l 599,091 In yGreatBritain June 2, 1944 1 Claim. (C1. 126-2815) This invention relates to dampersfof the swivel ling type. t

Dampers of this, type are much affected in `their operation vas the result of the deposit of flue dust in their vicinity and particularly -at thekbottom of the flues and on stops, guides Vand the like provided therein and in association with such dampers.

lThus, ue dust may accumulate against the lower edge of the hinged damper when the, damper is enclosed and in consequence opposer or prevent altogether its opening. t

In other casesdeposits of iiue dust may accumulate when the damper is open and provide resistance to its closing. i

Such difficulties do not usually arise in connection with darnpers of the sliding type, not only because of their vertical instead of circular movement, but also for the reason that when thel aperture between the lower edge of the slide and the flue bottom is very small the velocity of the flue gases passing through the aperture which is in the form of a slit increases greatly thereby sweeping away any flue dust which may have accumulated. With hinged dampers just before 'they have reached the closed position or shortly after opening, the gases are free to pass around all edges o'f the damper, or if the damper is of the louvred formation, around all edges of the damper ele-` ments. The result is that in a nearly closed louvre damper the velocity of the gases at the bottomof the ue is hardly greater than at other parts of the damper and the ue dust deposits are not automatically removed.

In dampers of this kind, when there is an accumulation oi flue dust, the damper has to remain partly opened untilV the ue `dust has been removed by other means, and if it shouldv be attempted to close the damper by force the dust ismerely consolidated. If in the case of a louvred n damper al1 of the pivoted damper elements are operated by the same operating gear, as is usually the case, none of the elements can be brought into the fully closed position if any one ofthein; is prevented from closing.

These difficulties are common with hinged dampers and have increased during recent years` the same advantages as are possessed bysiidn'g 55j?A and rollerviblind dempers of the rigid or flexible type.

in association with the damperata-.position ada'e cent to where the accumulation of ue dust would be likely to interfere withl the 'closure ofthe nue' bythe hinged ydamper elements of an auxiliary elementadapted to be moved independently of.

opened and closed while the' damper' is in"` it'sclosed position.

The result of moving the-auxiliary element' into its open position while tnedaiper is closed is; that the flue gases can 'only iiow through. the opening, thereby greatiylincreasing their velocity.. In yconsequenee this part is swept clear of any `-fiiii'e Where of the rigid type it i'riay'` also comprise resilient elements or iilexibllments to assist in eieeting a seal'.

The auxiliary element may be applied at the bottom' of' the; flue oi' any other position, lfor instance at the sides of horizontal or vertical iiue's`Y inl order to keep the stops or` abutments for the dampen element freel fr'oii" accumulations of flue dust'.

Y The auxiliary element may' be operated by anV operating gears opera-ted from outside independently from the damper operating' gear. ItV may alternatively be' coupled with the latter in such a? way that the auxiliaiyeleinentf' is moved into" the open position just before-and durin'gthe closing and before and during thel opening of' the damper; H t t I Where the auxiliary eiement isI of the hinged' typey it may be" secured to a shaft pivotail'y mounted and having secured to it an operating' lever, the element' beingjpr'ovided optionally with a resilient pad which wiilir'est 'against'tne bottom frame when the damperis'- cis'ed.

where tneauxiiiary eiemfent is' of the siiding" type; it may-beanfangedin guides' on the frame with whichthedar'npe is associated and 'secured- The invention consists, broadly, lin the. provision to means whereby it may be raised and lowered.

Where the auxiliary element is of the flexible type, it may be secured at its lower extremity to a roller, the upper extremity of the element being xed.

The roller is provided at one or both ends with an extension to which one end of a tape or like flexible element is secured, the other end being connected with a segment connected to a shaft adapted to be rotated by a central gear, the connection of the tape or band and the flexible auxiliary element to the roller being such that by the rotation of the segment the tape or band is unwound from the roller which is in consequence K caused to rotate thereby causing the flexible element to be wound about it.

This construction will enable the flexible mag terial to be moved with a minimum of friction between it and the framework of the damper.

The invention will be :described further in detail and by way of example with reference to the accompanying drawings in which:

Figure 1 is a view of a damper and its associated frame positioned in a flue;

Figure 2 is a sectional plan view of the construction in question on a major scale;

Figures 3 and 4 are views in elevation illustrating more clearly the mode of construction and operation of the auxiliary element shown in Figures 1 and 2;

v Figure 5 is a view in section of a construction of louvered damper;

Figure 6 is a fragmentary view on an enlarged scale also in section of this construction;

Figure '1 is a view in elevation thereof;

Figure 8 is a fragmentary view in section of a construction of a damper with the auxiliary element in the closed position;

Figure 9 is a corresponding view with the auxiliary element in the open position;

Figure 10 is a fragmentary view in elevation;

Figure 11 is a View in plan, and

Figure 12 is a View in section of a further construction of a damper in accordance with the invention.

Referring to Figures 1-4, I is the damper blade secured by arms 2 one of which is shown inv Figure 2 and to a shaft 3 arranged in a bearing 4 and its upper end in a bearing 5 for rotation by means of the lever 6 secured to it.

The bearing 5 is provided in a cover plate 1 furnished with a lifting eye 8 in forming part of the frame 9 of the damper.

To this frame there are secured flaps of flexible material Ei) associated with guards lIl to which their outer edges are secured at intervals byV tapes I2 designed to limit the degree of motion which may be imparted to the flaps under the action of the draught.

This frame is shown in Figure 2 associated with flexible flaps I3 by which a gastight joint is made between it and the channel element I4 secured in the walls I5 of the flue. v

In brackets I6 extending from the lower end of the frame there is mounted a spindle I1 secured to the auxiliary member I8 which is in the form of a flap and is furnished with a counterweight I9 adapted to constrain it into the position shown in Figure 4.

On each of the frame members there are provided abutments against which this flap will bear when in the closed position and to the spindle there is connected an arm 2| furnished with a roller 22 adapted to co-operate with a rampl 23 so as to cause the auxiliary member I 8 tomove from the position shown in Figure 4 to the position shown in Figure 3 when the hinged damper is closed.

` In opening the damper as will be appreciated the roller 22 descending the damper will permit the auxiliary member to move into the position shown in Figure 4 under the action of the counterweight I9.

Figure 5 illustrates a damper comprising two members 24 pivoted about the axis of the rods 25.

These members are associated with a frame, the upper element 26 and the lower element 21 of which can be seen from the drawings and with the upper member of the frame there is provided a flap 28 of flexible material, a ap 29 of similar material being secured to the lower of the two damper elements.

On the lower element 21 of the frame there is also provided a ap 3D adapted to co-operate with the lower of the two damper members 24 and to its lower frame member there is connected an auxiliary member 3| furnished with a pad 32 and pivoted on a spindle 33 to which is connected a lever 34 in turn connected with a link 35 oscillated by any suitable means so that motion imparted to the lever in the initial opening of the damper will raise the auxiliary member into the position shown in full lines in Figure 6 thereby allowing gases to pass through the lower frame member through the space 36 provided between it and the base 31 of the flue.

In t'he case of the construction shown in Figures 8 and 9, the auxiliary member indicated by the reference 38 is arranged so that it may be raised vertically under the action of a rod 39 oscillated by any suitable means.

This member is likewise connected with the frame of the flue and the damper itself is arranged to pivot in a manner similar to the lower damper element in the case of the construction shown in Figures 5-7.

Referring to Figures l0-l2, 4i] is a channel member arranged in the wall of the flue providing an air duct in which the mechanism for operating the damper element and the auxiliary means is located.

AThe damper element 4I is secured to a shaft 42 supported in bearings, one of which 43 is shown and provided with a gear wheel or the like 44 by which it may be rotated.

On the side member 45 of the damper frame there is secured a member 46 of flexible material,

the member 45 being provided with extensions 41 which are connected at each end with a band 5I with a segment 52 mounted upon a shaft 53 to which is secured a lever 54, the outer end of which is secured to a rod 55 oscillated by any suitable` means.

By moving this lever about the axis of the shaft 53 the segment may be rotated and such rotational motion will impart rotational motion to the shaft 53, thereby operating to raise and lower the bottom portion of the flexible element 4S or in other words roll the lower portion of this element on or unroll it from the roller in question, thereby in the one case providing an opening 56 through which flue gases may pass.

Adjacent to the lower end of the damper frame there are provided guards 51 which also provide a rest for the roller 49 when it is in its lowered v position.

I claim:

In a damper construction located in a conduit, the combination of a hinged main damper element; means operable externally of the conduit for moving said element from a fully open position into a substantially fully closed position in which a restricted opening is left between the lower edge of said element and the base of the conduct; and an auxiliary damper element mounted on said main element and operating means for moving the auxiliary damper element into a position to close said restricted opening, when the main element has been moved into its said substantially closed position, and for moving the auxiliary damper `from the position in which it closes the restricted opening, before the main element is moved in the reverse direction.

ERNST LOEWENHEIIVI.

6 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTs Great Britain May 12, 1948

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