US3265058A

US3265058A - Air heater using volatile fuels

Info

Publication number: US3265058A
Application number: US426959A
Authority: US
Inventors: Schmitt Manfred Carlhors Linus
Original assignee: Bahco AB
Current assignee: SNA Europe Industries AB
Priority date: 1964-01-24
Filing date: 1965-01-21
Publication date: 1966-08-09
Anticipated expiration: 1983-08-09
Also published as: DE6604583U

Description

9, 1966 M. c. L. SCHMITT AIR HEATER USING VOLATILE FUELS Filed Jan. 21. 1965 INVEN TOR AmRNExs United States Patent 3,265,058 AIR HEATER USING VOLATILE FUELS Manfred Carlhorst Linus Schmitt, Kelheim (Danube), Germany, assignor to Aktiebolaget Bahco, Stockholm, Sweden, a corporation of Sweden Filed Jan. 21, 1965, Ser. No. 426,959 Claims priority, applicgaiio/izgweden, Jan. 24, 1964,

4 Claims. (Cl. 126-110) The present invention relates to a heater for volatile fuels and especially intended for motor vehicles and comprising a substantially horizontal combustion chamber surrounded by one or more jackets concentric therewith to form one or more channels for air to be heated, a volatilization chamber directly connected to the combustion chamber, a fuel supply means, a starting device including a heating wire and a fan for supplying air for the combustion and heating, the fan and the combustion chamber being arranged parallel to each other. As an example of such a heater reference is hereby made to the Swedish Patent 176,718.

A problem in such known heaters is the exchange of defective and worn parts. Those parts which are most exposed in these respects and most often must be replaced are the fuel supply means with its electric control means and the starting device with the heating wire. The disadvantage with the present types of heaters is the fact that these means are situated between the fan and the combustion chamber which has the elfect that the exchange of these means is very complicated.

This problem is solved according to the present invention, in that the front portion of the combustion chamber, as seen in the direction of flow, the volatilization chamber, the starting device and the fuel supply means are arranged in an end portion of the heater which portion is detachably connected to the remainder of the heater.

The invention is by way of an example shown on the attached drawing in which FIGURE 1 shows the heater in longitudinal section and FIGURE 2 shows the same in longitudinal section with its front portion separated from the remaining portion.

The heater according to the present invention comprises a substantially horizontal combustion chamber 1 surrounded by a jacket 2, which together with the wall of the combustion chamber forms an annular channel 3 around the combustion chamber for the air to be heated. At some distance from the front end of the combustion chamber there is provided a clearance 5 for the supply of secondary air. In front of and partly surrounding the adjacent part of the combustion chamber there is formed a volatilization chamber 6 into which projects a heating wire 7 of a starting device. A nozzle forming a part of the fuel supply device 8 is provided above said heating Wire 7. A fan 9 to supply combustion air as well as air to be heated is arranged at the side of the combustion chamber and parallel to the same. Fan 9 comprises first blades 9 which deliver air to the volatilization chamber 6 and the combustion chamber 1. Specifically, blades 9' force air through opening 12, a part of which enters chamber 4 through opening 13 and a part of which enters chamber 4 via openings 14. A further part of this air enters chamber 1 through clear- See ance 5 as secondary air. A larger blade unit 9" mounted at the right of fan 9 supplies the air to be heated to channel 3 through a tangential duct (hidden in the figure) arranged at the left end of channel 3. Bafile 15 serves as a mount for fan 9 and a boundary between spaces effected by blades 9' and 9". The exhaust gas outlet is designated 10 and the hot air outlet '11.

The various means described above are combined into two separate units easily detachable from each other, i.e. a smaller unit 12 comprising the front portion of the combustion chamber, the volatilization chamber, the starting device and the fuel supply device and a greater unit 13 comprising the remainder of the combustion chamber with connecting ducts and outlets etc. and the fan.

Thus, by this invention it is obtained that those parts which according to experience are most subjected to damage and wear can be easily detached as a separate unit from the remaining portion of the heater and thus form an exchange-unit.

Iclaim:

1. A liquid fuel heater for automobiles and the like comprising a first unit having a housing with an open end facing the rear of the heater, a fuel supply mounted on the inside of said housing, a volatilization chamber and a heater means supported below said fuel supply and within said housing, a front combustion chamber having a front end supported adjacent to and communicating with said volatilization chamber; a second unit comprising a jacket, a fan supported within said jacket, said jacket defining an air intake port contiguous said fan for enabling air to enter said jacket in response to the drawing of said fan, an elongated rear combustion chamber supported below said fan, said jacket being spaced from and defining with the outer walls of said rear combustion chamber a channel for enabling the air therein to be heated by the walls of the rear combustion chamber, a heated air exhaust communicating with said channel and the space to be heated, an exhaust for products of combustion communicating with said rear combustion chamber and the ambient, said first unit being detachably fitted to said second unit so that the rear :of said housing releasably engages the forward end of said jacket and the rear of said forward combustion chamber detachably communicates with the front of said rear combustion chamber.

2. A heater as set forth in claim 1 wherein the front and rear combustion chambers are coaxial and are parallel to the axis of said fan, said fan adapted to draw air in an opposite direction to the direction of air movement Within said channel and combustion chambers.

3 A heater as set forth in claim 2 wherein the rear of its forward combustion chamber comprises a tubular portion which penetrates the front of said rear comlbustion chamber.

4. A heater as set forth releasable securing means engagement.

in claim 3 further comprising maintaining said units in fitted References Cited by the Examiner UNITED STATES PATENTS JAMES W. WESTHAVER, Primary Examiner.

Claims

1. A LIQUID FUEL HEATER FOR AUTOMOBILES AND THE LIKE COMPRISING A FIRST UNIT HAVING A HOUSING WITH AN OPEN END FACING THE REAR OF THE HEATER, A FUEL SUPPLY MOUNTED ON THE INSIDE OF SAID HOUSING, A VOLATILIZATION CHAMBER AND A HEATER MEANS SUPPORTED BELOW SAID FUEL SUPPLY AND WITHIN SAID HOUSING, A FRONT COMBUSTION CHAMBER HAVING A FRONT END SUPPORTED ADJACENT TO AND COMMUNICATING WITH SAID VOLATILIZATION CHAMBER; A SECOND UNIT COMPRISING A JACKET, A FAN SUPPORTED WITHIN SAID JACKET, SAID JACKET DEFINING AN AIR INTAKE PORT CONTIGUOUS SAID FAN FOR ENABLING AIR TO ENTER SAID JACKET IN RESPONSE TO THE DRAWING OF SAID FAN, AN ELONGATED REAR COMBUSTION CHAMBER SUPPORTED BELOW SAID FAN, SAID JACKET BEING SPACED FROM AND DEFINING WITH THE OUTER WALLS OF SAID REAR COMBUSTION CHAMBER A CHANNEL FOR ENABLING THE AIR THEREIN TO BE HEATED BY THE WALLS OF THE REAR COMBUSTION CHAMBER, A HEATED AIR EXHAUST COMMUNICATING WITH SAID CHANNEL AND THE SPACE TO BE HEATED, AN EXHAUST FOR PRODUCTS OF COMBUSTION COMMUNICATING WITH SAID REAR COMBUSTION CHAMBER AND THE AMBIENT, SAID FIRST UNIT BEING DETACHABLY FITTED TO SAID SECOND UNIT SO THAT THE REAR OF SAID HOUSING RELEASABLY ENGAGES THE FORWARD END OF SAID JACKET AND THE REAR OF SAID FORWARD COMBUSTION CHAMBER DETACHABLY COMMUNICATES WITH THE FRONT OF SAID REAR COMBUSTION CHAMBER.