US2144129A - Warm air heating system - Google Patents

Description

Jan. 17, 1939. w STEELE 2,144,129

WARM AIR HEATING'SYSTEM v Filed June 22, 1957 I (I 3 3/0 I M I 5: X

. wn-nmfiusie e (Ittomeg Patented Jan. 17, 1939 PATENT OFFICE WARM sin. HEATING SYSTEM William L. Steele, near Seattle, Wash. Application June 22, 1937, Serial No. 149,742

2 Claims. (01.126-116) My invention relates to furnaces, and more particularly to an arrangement of the parts thereof, as thecombustion means, in combination with'a hot air circulating system.

One of the primary objects of this invention is to lessen the number of parts in such a system, by adapting one part to perform the tune, tions heretofore performed by parts now omitted,- thus lessening the cost of the system, rendering it more compact, and simplifying its maintenance, all with no lessening of its eficiency,

but rather with an increase in efficiency. In

part these results are accomplished. by omitting any separate blower for the supply of air for combustion, and by supplying such air by tapping the air circulating system, thereby obtaining air under-pressure, removing from 'the circulating system a certain amount of air and forcing its replacement with fresh air, and effecting circulation ofair through the circulation system immediately upon starting the burner or other combustion means.

With these and other objectsin mind, as will appear hereafter, my invention comprises'the novel parts and the novel combination and relative arrangement thereof, as shown in the accompanying drawing and as will be more particularly described herein and defined by the claims which terminate this specification.-

In the accompanying drawing I have shown my invention embodied in. an. illustrative form, as now preferred by me, it being understood that various changes may be made in the form of the parts, and to some extent in their relative arrangement, without departing'irom' the spirit of my invention.

Figure l is a general horizontal sectional view through the he'atingand air circulating plant,

and Figure 2 is a general vertical section through the same, substantially on the line 2-2 of Fig- The furnace as shown herein consistsof a fur nace body I supported upon the floor or upon a base it, having within it an upright combustion chamber it open at its top and lined with fire brick or similar refractory material. A combustion means, such as the oil burner tip 2, en-

ters the combustion chamber lLthrough an inlet such as the' sleeve ii, the burner tip being suitably supported in this sleeve. The products of combustion, emanating from the combustion chamber it, pass into the upper part of the furvnace body l and then pass downwardly and outwardly through a flue connection l3., Between the upper part of the furnace body I and the flue connection I 3 I prefer to arrange baffling means, such as the ring I4, supported upon the combustion chamber II and spaced slightly at its periphery from the inner wall of. the furnace body i, the-purpose of this being to cons duct the hot gases into intimate contact with the furnace body to heat the latter, and to abstract all possible heat from the hot products of com bustion. The form of this furnace may be other than that described, and its particular formis not it considered a part of the present invention.

Surrounding the furnace l is a casing 3 of appropriate shape, preferably rectangular in plan, and partitioned, as indicated at it, to provide a space it wherein the air is heated by conit; tact with the furnace i, from which leads the hot air conduit it, and a chamber or extension 32, all within the casing 3, to which. chamber 32 the cold'air return pipe it is connected.

Between the chamber 32 and the chamber it, so and preferably within the chamber 312, is disposed a blower ii, arranged to receive air from within the chamber 32 and to discharge it at it through the partition 3% and into the hot air chamber 3i, preferably at the bottomof the lat- 25 ter chamber. This blower, while in operation, efiects positive circulation of the air throughout the system. 7

Usually the oil burner, coal stoker, or other combustion means is a unit, including an oil 30 pump, a blower, and regulating means, and when r it is connected to a furnace it extends outwardly notwithstanding the omission of the usual blower of such a burner.

The oil pump it is preferably located within the extension it of the casing, where it is with in the general plan of the furnace casing. From it extends the pressure pipe ii to the tip 2, and

to it are connected. the supply pipe S and the re turnpipe R, connecting the pump with the storage tank (not shown); The oil supply line 2| may extend between the burner tip 2 and the pump 20 externally of the casing 3, or it may lie within the casing. Preferably it is outside, in w part, at least, for it occupies no appreciable space, and is more accessible when the tip must be cleaned, and there is provided a cut-off or regulating valve 22 adjacent the burner tip. The

sleeve l2 admitting to the burner tip is closed by a removable door l5 through which the oil supply line 2| passes.

Also within the extension 32 is a motor M connected to drive the blower l and the oil pump 20. Such a connection is indicated by the belt B. A box T may also be supported within this chamber '32 for housing a transformer, electrical controls, and connections for ignition points P terminating adjacent the burner tip 2. A filter F may be interposed between the cold air return conduit 33 and the inlet to the blower 4, likewise in the extension 32, and as is usually the case, such filters are arranged for inspectionand replacement. Other devices sometimes employed in such systems, as a humidifier, may be incorporated, but are not shown, as they form no part of the invention.

Air must be supplied to the interior of the furnace, adjacent the burner tip 2, in order to support combustion. Usually this must be supplied under pressure. and the outer end of the sleeve [2 is closed by the door IS, the sole supply of air to the burner is by means of a combustion air supply conduit 5 which taps the pressure side of the air circulating system to receive air from the latter, its end 50 being disposed at the discharge outlet 40 of the blower 4, and this conduit 5 leads thence to a connection to the sleeve l2, whence it issues surrounding the burner tip into the combustion chamber ll. Barring minor leakage, this conduit 5 constitutes the sole air supply for combustion, and this air is supplied under pressure from the air circulating system, but by so doing it eliminates the necessity of a separate blower for the burner: Similarly the employment of a single motor and the location of the oil pump adjacent the blower eliminates a separate motor for the drive of blower and oil pump, and further simplifiesthe system, and enables all parts to be compactly arranged so as to occupy a minimum of floor space.

Objections to the system described have been raised on the ground that it is not desirable to deliver air for combustion from that blower which .efl'ects circulation of air through the circulation system, for the reason that when the furnace is cold operation of the blower will circulate cold air through the house, yet the blower must operate to supply air for combustion. The burner, hence a blower so connected, must operate for some period of time before the furnace becomes heated sufllciently to aifect or'materially raise the temperature of the air in the house, and it has been consideredundesirable to circulate the air before its temperature has been raised somewhat. It hasbeen felt that this would have a tendency to cool the air within the house. For this reason, among others, burners have been supplied with a blower separate from the circulating blower,

Since the furnace is closed and while the, urner blower starts immediately the burner starts, the controls have been arranged to start the circulating blower only after thefurnace has been heated to an appreciable temperature. This reasoning, however, is fallacious, for the air in the house is at a given temperature, and the furnace body is at substantially the same temperature, hence circulation of this air through the house does not cool the house, nor, or .course, does it warm the house, but it does no harm and it brings the circulating air into contact with the furnace body so that the air is warmed as soon as the furnace body becomes heated to any degree, and thus gradually warms the house. Because the temperature of the house closely corresponds to the temperatures of the furnace, overrunning of the burner is less likely, and economy in the use of fuel and more even temperature results. Thus tapping the circulating air for the supply of air for combustion does no harm, and this arrangement effects a considerable economy of parts, economy of operation, lessens the difliculties of maintenance, and cuts down on the floor space of the installation as a whole.

What I claim as my invention is:

1. A hot air heating and circulating system inluding a furnace body having an opening in a side, a casing surrounding the same, and partitioned to define a hot air chamber immediately about the furnace body and a cold air chamber at one side of the hot air chamber, the casing having an opening through a side and registering with the opening in the furnace body, a sleeve joining said two openings, a burner tip received in said sleeve to discharge within the furnace, and accessible for removal or adjustment from without the casing, means within'the cold air chamber to effect air circulation from the cold air chamber to the hot air-chamber, a conduit tapping said air circulating means to conduct a portion of the air to the sleeve, a fuel pump within the cold air chamber, and a conduit connecting at one side of the hot air chamber, the casing r having an opening through its side registering with the opening in the furnace body, a sleeve joining said registering openings, a burner tip received in said sleeve to discharge within the furnace body, and accessible for removal or adjustment from without the casing, a conduit for conducting combustion air to the sleeve, and

' means within the cold air chamber to effect a circulation of air from the cold air chamber to the hot air chamber and a supply of air to the conduit, a fuel pump within the casing, distant from the burner tip, and a conduit connecting the fuel pump to the burner tip.

'WIILIAM L. STEELE.

Images