US1668537A - Matthias xiurxxn - Google Patents

Description

M. LURKEN May 1, 1928.

AIR HEATER Filed April 24, 1925 Patented May 1, 1928.

UNITED STATES PATENT OFFICE.

ILT'I'EIAS rum, DESSAU, GERMANY, ASSIGNOB TO HUGO. JUNKEBS, 0]

DESSAU, GERMANY. i

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Application fled April 24,1925, Serial lilo. 25,723, and in Germany May 1, 1924.

My invention relates to air heaters and more especially to a heater of the'circulation type in which a heating element fed with steam or other heating medium, as an 6 electric current, extends across a chamber through which air is drawn or forced by means of a fan or the like, this air being as a rule taken from the room to be heated and, after its temperature has been raised by the heater, being returned into the room.

In heaters of this type difiiculties were encountered on account of their considerable weight and of the necessity to provide strong bearings for the moving parts, such as the is fan and its drive.

According to my invention, I provide a very simple and self-contained unit of great strength by utilizing the walls of the caslng, which connects the heater and the fan, as

supports for these parts. To this end, 1 se cure them to a supporting frame or wall bracket in such manner that they form the only connection between the frame and the other parts. a

A particularly useful construction is obtained by arranging the heating element in horizontal position in the bottom portion of the air chamber, an air inlet being formed in one of the walls of the chamber and the fan being arranged in this opening. The

roof portion of the casing enclosing the chamber is preferably arched so as to strengthen it and to enable it to support the motor. Preferably the arched roof projects 5 beyond the wall in which the fan is ar- I ranged, and a frame supporting the fan is suspended from this projection. If the fan is directly driven by a motor, the motor will also be suspended from the projecting 4o roof and will be surrounded by the air discharged by the fan. The danger of the motor being overheated is overcome by providing the fan with a boss of large diameter, thereby preventing the hot air from imping- 5 ing directly on the motor. The motor may further be surrounded by a nozzle which extends into the vicinity of the circumference of the boss of the fan and conducts cooling air through the motor by suction.

In the drawings aflixed to this specification and forming part thereof, a device embodyinfi my invention is illustrated diagrammatica y by way of example.

In the drawings, 7 55 Fig. 1 is a cross section, and

Fig. 2 is a front end elevation.

Referring to the drawings, 1 is a ribbed heating element or radiator, 2 is the air chamber, 3 is the fan and 4 its motor. 5 is a strong frame or bracket serving to secure the heater to the wall. The bracket 5 is preferably made of angle iron in the shape of an inverted U. U, 6 are bolts or the like which hold the bracket on the wall.

The lateral walls of the casing enclosing the chamber 2 are secured to the frame 5. The arched top portion or roof surrounds the fan 3. 8 is the fiat front wall in which a'circular opening for the fan is provided. The arched roof 20 projects beyond the front wall at 9 and carries a frame 10 supporting the motor 4 which is directly coupled with the fan 3. The arching of the roof and its projection 9 enable the latter to carry the weight of the motor and fan without requiring any separate bracing means.

The heating element or radiator 1 is secured to the side walls of the duct 2 by means of flanges 12 so as to be supported by the walls.

Arrows a indicate the direction of flow of the air through the heater.

In order to prevent excessive heating of the motor 4 by the hot air, the motor is surrounded by .a cylindrical envelope 15 the inner end 16 of which extends into the immediate vicinity of the circumference of the boss 17 of the fan. The air flowing through the fan causes suction at this point so that cool air from outside is drawn into the envelope 15 and past the motor 4 as indicated by the arrows b and at the same time the hot air is deflected to the outside and away from the motor.

If desired, conduits for drawing in cooling air from more remote points may be provided.

I wish it to be understood that I do not desire to be limited to the exact details of construction shown and described, for obvious modifications will occur to a person skilled in the art.

I claim 1. An air heater comprising a frame adapted to be fixed to a Wall, a casin fixed to and projecting from said frame an open at the bottom to allow the inflow of air and a substantially circular air outlet in the top part of its front wall opposite said frame,

the roof portion of said casing being arched and to act as bracing member for said casing, a heating element in the bottom-open ing of the casing, a fanin said air outlet,

a motor in front ofsaid fan outside of said casing and motor supporting means suspended from'said bracing member. A

2. An air heater comprising a frame adapted to befixed to a- WalL' a casing fixed toand projecting from said frame and open at the bottom to allow the inflow of air and asubs'tantiallyjcircnlar'air outlet in the top part of its front Wall opposite said frame,

the roof portion of said casingbqi to 'matchthe curvature ofsaid Ii! outlet and to act as bracing member for said casing, said roof portion project beyond said front wall to form anarc ed penthouse-like extension, a heatin element in thebottom opening of the casmg, a, fan in said air'outlet, a motor in front of said fan outside of said casing and: motbr mpporting means suspended from said extension.

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