US2596907A

US2596907A - Furnace draft regulator

Info

Publication number: US2596907A
Application number: US56691A
Authority: US
Inventors: Harvey W Ward
Original assignee: LUELLA E LUCAS
Current assignee: LUELLA E LUCAS
Priority date: 1948-10-27
Filing date: 1948-10-27
Publication date: 1952-05-13
Anticipated expiration: 1969-05-13

Description

May 13, 1952 E. A. LUCAS FURNACE DRAFT REGULATOR Filed Oct. 27, 1948 w izzai MFAWZS Patented May 13, 1952 FURNACE DRAFT REGULATOR Elmer A. Lucas, Edgewood, It. I.; W. Ward Harvey, Newport, R. I., executor of said Elmer A. Lucas, deceased, assignor to Luella E. Lucas,

Newport, It. I.

Application October 27, 1948, Serial No. 56,691

' 1 Claim. (01. 236-45) This invention relates to a damper for controlling the draft in a furnace flue, particularly to a draft regulator which is responsive to sudden gusts or variations of pressure in the flue. A common way of controlling a draft through a furnace is to provide an opening in the flue near the furnace with a check damper in the opening which opens with any variation of pressure in the flue to by-pass the furnace, that is reduce the pressure variation transmitted to the furnace. However such a damper is not positive in action, that is, it merely reduces the increase in draft rather than eliminating that increase altogether.

- Furthermore such a check damper does not react quickly to sudden drafts so as to prevent their taking some effect in the furnace.

Objects of the present invention are to provide a draft regulator responsive to variations in flue pressure, which is quick and positive in action, and which is simple and efficient in operation.

In one aspect the invention comprises a damper located in the flue which moves from between a position in which it blocks the draft through the flue to a position in which it does not impede the draft, a deflatable chamber which is interconnected with the flue and which expands or deflates in response to variations in the draft in the flue, the chamber beink linked to the damper by suitable means for moving the damper from its operative to inoperative position as the chamber responds to variation in the draft. Preferably the damper is urged towards operative position by any commonly used yielding means while the yielding means are counter-balanced by the movable portion of the chamber so that the damper does not leave inoperative position until the chamber responds to an increase in the draft. The chamber may be connected with the flue either directly or through a duct.

In a specific aspect the chamber includes a transverse movable baflie which divides chamber into two spaces one of which is interconnected with the flue. A change in the draft in the flue will be felt in said space and the baffle will move in response to that change.

For the purpose of illustration a typical em-.

bodiment of the invention is illustrated in the accompanying drawings in which Fig. 1 is a side elevation of the draft regulator shown in connection with a furnace, a flue, and a chimney;

Fig. 2 is an enlarged side elevation of the draft regulator like that shown in Fig. 1; and

Fig. 3 is a side elevation at right angle to the elevation shown in Fig. 2.

As shown in Fig. 1 the draft regulating device D is located adjacent a flue B which runs between a furnace A and a chimney C. The draft regulator comprises a damper l in the flue B, a chamber housing 2, a duct 3 interconnecting the chamber and the flue, a coiled spring G disposed between a yoke l3 and the axle 9 of the damper which urges the damper toward open position, a movable baffle or transverse wall 6 in the chamber suspended by the line 1 from an arm 8 connected to the axle 9 of the damper I so as to counter-balance the spring 4.

The chamber within the housing 2 is divided into two spaces H and I2 by the baffie 6, the upper space ll being connected to and following changes of air pressure in the flue B. The baiile 6 is supported and positioned by a shaft I! which is suspended on the line 1 and extends through the chamber lll2 entering at narrow bore inlets l8 which impede the flow of air therethrough. The baflle 6 normally rests in the lower portion of the chamber Hl2 with its weight counterbalanced by the spring 4 so that it may be moved upwardly by a small force. A yoke I3 supports the bearings I4 of the axle 9 and its supporting post M with the flue 3 and the rod it serve to hold the chamber housing 2 in position.

The draft regulator operates as follows. With a normal flow of air and gases through the furnace A, the flue B and the chimney C, the air pressure in the flue B, the duct 3, the upper chamber space I! and the lower space IE will be the same, and the baffle 6 will remain in rest position thus holding the damper l in open position as shown in Figs. 1 and 2. However, if there is a sudden change in the draft caused by a windy gust above the chimney or other cause the air pressure in the flue 8 will decrease. This decrease in pressure will take effect through the duct 3 on the upper air space I l causing the baffle 6 to rise. As the baflle rises weight on the arm 8 is reduced and the spring A will be allowed to urge the damper I toward a closed position thus preventing the increased draft from taking effect in the furnace.

It has been found that this type of draft regulator assures a quicker and more effective check on sudden changes in furnace flue drafts, and requires little or no attention or adjustment. Also use of this draft regulator obviates the need for providing any opening into the furnace room through which soot or obnoxious gases may escape from the flue.

'It should be understood that the present disclosure is for the purpose of illustration only and that this invention includes all modifications 3 and equivalents which fall Within the scope of the appended claim.

I claim:

A furnace draft regulating system comprising a furnace, a chimney, a flue interconnecting the furnace and the chimney, a collapsible chamber, a draft regulator for a furnace flue comprising a collapsible chamber, a duct providing unimpeded communication between the chamber and the flue, said chamber having a movable wall responsive to variations in the draft through the flue, in the flue between the duct and the furnace a damper movable between an operative and an inoperative position, and means linking-the wall to the damper for moving the latter to an operative position as the wall responds to an increase in the draft, said duct being connected to the flue intermediate the damper and the chimney, whereby sudden changes in atmospheric pressure transmitted through the chimney are prevented from increasing the draft through the furnace.

ELMER A. LUCAS.

REFERENCES CITED The following references are of record in the.

file of this patent:

UNITED STATES PATENTS 'Niimber Name Date 1,313,447 IWright Aug. 19, 1919 1,833,064 'Baumann Nov. 24, 1931 2,164,607 Cole July 4, 1939 2,200,669 Suman et a1 May 14, 1940 2,246,629 Jansen June 24, 1941 2,441,803 Duis et a1 May 18, 1948