US1717421A

US1717421A - Delivering preheated air to combustion chambers

Info

Publication number: US1717421A
Application number: US241582A
Authority: US
Inventors: Gerrit Van Daam
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-12-21
Filing date: 1927-12-21
Publication date: 1929-06-18
Anticipated expiration: 1946-06-18

Description

June 18, 1929. G. VAN DAAM DELIVERING PREHEATED AIR TO COMBUSTION CHAMBERS 2 Sheets-Sheet l I Filed Dec. 21, 1927 .flziorney June 18,1929. G. VAN DAAM DELIVERING PREHEATED AIR TO COMBUSTION CHAMBERS 7 Filed D80. 21, 1927 2 Sheets-Sheet 2 WM vliforneg M67220)": Ger-r12; Min/Deana Patented June 18, 1929.

UNITED (STATES GERRI'I VAN DAAM, OF 'BUFFALO, 'NEW .YORK.

DELIVERING PREHEATED AIR TOCO MBUSTION CHAMBERS.

Application filed December 21, 1927. Serial No. 241,582

My invention relates to delivering preheated air-to combustion chambers, and is especially applicableto the combustion of coal, Where the unburned gasesrise from the fuel bed :and are mixed with the preheated air delivered thereto to facilitate the combustion of said gases. i

:The invention also comprises the control of the flow of air to be preheated and deliv ered to the combustion chamber in order to 'meet the conditions of the fuel bed and the temperature'of the combustion chamber so that when the combustion chamber is relatively'cold the flow of air will be restricted and as the'chamber becomes heated the flow of air will be relatively increased.

Referring to the drawings which illustrate merely 'by way of example, suitable means for effecting the invention Fig. 1 is a central longitudinal section of the air heating element.

Fig. 2 is a similar view showing a modification.

Fig. 3is a cross-section online 3, 3 of Fig. 1.

Fig. 4 is an elevation of the discharge end of the element.

Fig. 5 is an elevation of the inlet end of same.

Fig. 6 is an elevation of the air inlet damper and thermostat control therefor.

Fig. 7 is a side elevation with adjacent parts in section of a modification of thermostat control.

Fig. 7 a is a section on the line 7 7 of Fig. 7.

Similar.numerals refer to similar parts throughout the several views.

The chambered formation is preferably made with double corrugated walls 8 and 9 with struts or posts 10 cast integral therewith for holding the same together in proper spaced relationship and for communicating heat to the space or passageway 11, between said walls.

The annular passageway 11 is in communication with the entrance chamber 12 at one end and with the discharge chamber 13 at the other end of the heating element. The central chamber 14 is the tempering chamber and is also in communication with the entrance chamber 12, but may be closed to chamber 13 by means of the plug 14 as in Fi 1.

The entrance chamber 12 is in communication with the inlet pipe or passage 15 which passes through and is secured to the furnace door 16 and is provided on the end projecting outside the furnace door with the air intake cap or head 19, which is shown threaded onto pipe 15 and forms a clamping means ed to move in the plane of the margin of the opening of passage 15.

In Fig. 7 the thermostat comprises the fiat bi-metallic strip 22 in coil formation secured to one end of therod 23'carrying at its other end the damper or valve '24 adapted to move to and away from the opening of inlet passage 15 at right angles'to the-plane ofsaid opening. W

I This thermostat controlled valve is located withinfthe entrance chamber 12and partakes of the temperature ofthe heating element, 1

In Fig. 2,

screens

25 and 26 ofwire cloth,

or the like, are inserted transverse the longitudinal extension of chamber 14. .In the zones of greater cross-sect on the screens 25 are of annular formation: the central opening of same being closed by a metal disc or baffle 27. In the zones of lesser cross-section the annular pieces or baflles 28 of sheet metal are inserted, with the openings in same closed by the screens 26. With this construction the chamber 14 is open at both ends and forms a passage from chamber 12 to chamber 13. With this construction the chamber 14 ma form, the sole passage from chamber 12 to chamber 13 or it may be effective in cooperation with passage-way 11.

What I elaimis:-

1. In a device of the character described, the combination of an air heating element comprising a chambered formation having double parallel and continuous corrugated walls of annular cross-section forming a central continuous chamber and a passage between said walls from one end to the other, with an air inlet at one end and a chamber provided with discharge vents at the other end.

2. In a device of the character described, the combination of an air heating element comprising a chambered formation having double parallel and corrugated walls of annular cross-section forming a central continuous passage with the inner wall and a passage between said two walls from one end to' the other, with an air inlet at one end and a chamber provided with discharge vents at the other end, and a thermostat controlled valve for the inlet comprising a bi-metal strip in curved formation attached directly to the damper.

3. In a device of the character described, the combination of an air heating element comprising a chambered formation having double parallel and corrugated walls forming a passage'between said walls from one end to the other, with an air inlet at one end and a chamber provided with discharge vents at the other end, and means for clamping the element to a supporting wall including a chambered air inlet head located outside the combustion chamber.

4. In a device of the character described, the combination of an air heating element comprising a chambered formation having double parallel and corrugated walls of annular cross-section with spacing struts between said walls, forming a passage between said walls from one end to the other, with an air inlet at one end and a chamber provided with discharge vents at the other end.

5. In a heating device of the character described, the combination of an air heating element comprising a chambered formation having corrugated walls forming a passage from one end to the other, with an air inlet at one end and discharge vents at the other end, and annular screens inserted transverse the longitudinal extension of the passage in the zones of greater cross-section and sheet metal discs centrally disposed in the openings of said screens.

6. In a heating device of the character described, the combination of an air heating element comprising a chambered formation.

sert-ed transverse the longitudinal extension r of the passage in zones of lesser dimension with screens of wire mesh inserted in the openings of said annular formations.

7. In a device of the character described,

the combination of an air heating element comprising a chambered formation providing a passage of annular cross-section, extending from one end to the other of the heating element, with an air inlet at one end and discharge vents at the other end, an inlet valve between the inlet and the said passage and a thermostat control for said passage comprising a valve and single bent bi-metal strip having one end secured to a stationary support and the other end secured directly to and supporting the valve. 7

8. In a device of the character described, the combination of an air heating element 'con'iprising a chambered formation provid ing a passage of annular cross-section and extending from one end of the heating element to the other with an air inlet at oneend and discharge vents at the other end, an inlet valve between the inlet and the said passage and a thermostat control therefor comprising a single curved bi-metal strip having one end secured to a stationary supportand the other end connected directly to and forming the sole support for the valve.

GERRIT VAN DAAM.