US1943135A

US1943135A - Thermostatic pilot buflner

Info

Publication number: US1943135A
Authority: US
Publication date: 1934-01-09
Anticipated expiration: 1951-01-09

Description

Patented flan. Q, 3934 THERMOSTATHC PKLQT BURNER,

Clarence H. Morrow, (lleveland, Ohio, assignor to The Hotstream Heater Company, Cleveland, 1 01:10, a corporation cl Ohio Application June 22,1932. Serial No. 61%,832

3 Claims.

This invention relates to thermostatic pilot burners, its object being to provide a pilot burner which is of very'simple form, which can be made and sold at low cost, which is so constructed as to provide a hot and eflicient flame which is not easily blown out and whose gas consumption is low, and particularly to provide a pilot burner which is so formed as to rapidly and efficiently communicate heat to the thermostatic element or elements with which it is associated for more rapid and accurate response to temperature changes, as will appear.

In the drawing Fig. 1 represents a side elevation, partly in section, on the line 1-1, Fig. 2, through one form of thermostatic pilot burner embodying the invention; Fig. 2 is a plan view, partly broken out and in section, on the line 2--2, Fig. 1, thereof; and Fig. 3 is-a broken out sectional perspective view of the burner.

While the burner forming the subject matter of the present invention may be used in connection with various forms of thermostatic elements, for convenience and in no sense of limitation it is shown assembled with thermostatic valve mechanism of the same form described, illustrated and claimed in my prior application for Thermostatic gas valve. filed February 3, 1932, Serial 'No. 590,572, to which reference may be had for a more complete description of the thermostatic 30 valve mechanism, if desired.

For the purposes of the present application. it is sufiicient to say that the valve mechanism comprises a valve casing 1, the chamber of which is provided with a ported cross wall 2, gas flow through the opening in which is controlled by a valve 3 moved toward its seat by a spring 4 and normally held open, when gas flow or supply is desired, by an adjustable slide 5 actuated by a spring 6, which tends to move the slide upwardly 49 in Fig. 1 or to the valve closing position. 7 and 8 represent the gas supply and discharge pipes.

Associated with said valve mechanism are suitable thermostatic elements, including a relatively expansible member 10, which may be made of copper, brass or other materials with a high coefilcient of expansion under heat, and a second member 11 which may be made of a material of relatively low coemclent of expansion, such as steel, iron or the like. Member 11 is of tubular form screwed into a part of the valve casing and surrounding member 10, which is of rod form and is provided on its inner end with a reduced extension 12 sliding in a plug 13 with its inner end extending into the gas chamber and forming an obstacle to movement of a latch member 14 (Cl. ESQ-113) tached, as will appear. 59

The burner, shown in detail in Fig. 3, comprises one, or at most, 'two members. It has a body portion 16 threaded at 17 for connection to the end of rod 10, the body portion being provided with a minute port or passage 18, the outer end of which opens into a through recess 19 of the body lying between a plurality, two being shown,

of longitudinal side arms 20 connecting the body to an end disc or plate 21 which is spaced some distance beyond the end or the port 18. The outer end of the rod 10 is also providedwith a longitudinal passage 22 communicating with a cross port 23 by which the jet port 18 is made to communicate with the chamber 24 within the tube 11 and surrounding therod 10, said chamber communicating with a gas supply pipe 25.

With this arrangement, the supply of gas being turned on through the pipe 25, gas flows by way of the cross port 23 and passage 22 to the jet port 18, issuing therefrom under pressure in the 39 form of along thread-like stream which impinges on the center of the disc or plate 21, being there mixedwith the air in the chamber 19, so that the gas mixture flows outwardly toward the edges of the plate 21. When the burner is ignited the flame is produced at the plate 21 and shoots out in all directions from its center toward its edges and even slightly beyond the same, the flame being blue and hot and very quickly and efiiciently heating the plate. Because the entire burner, including the plate 21, bars 20 and base 16, is one solid piece of metal which may be made of highly heat conductive material, such as copper or brass, the heat of the flame is very rapidly communicated directly to the end of the thermostatic element 10 to which the burner is threaded, as a result or which variations in temperature caused by presence or absence of the pilot flame are rapidly communicated to the thermostatic elements with a quick response at the valve mecha- 10o nism controlled thereby.

For more efficient operation, the burner may also be supplied with means for directing the air supply into the chamber 19 and the flow of products of combustion therefrom. The means shown for this purpose is a washer-like member 26, which is sleeved over the burner arms with a tight connection thereon, such as by being a driving fit, and which occupies the position shown in the drawing midway between the ends of said chamher. As a consequence, air enters the chamber in the burner through the openings thereto at the left of the washer 26 in Fig. 1, and flame and products of combustion issue from said chamber 5 through the two openings thereto at the right of the washer in Fig. 1. This arrangement produces a sort of injector action which insures and guides or directs the air flow and maintains the burner operating under all conditions.

What I claim is:

1. Thermostatic mechanism of the class described, comprising two cooperating thermostatic elements, one of which is formed of relatively expansible and the other of relatively non- -expansible material, the expanslble element hav- 2. A burner, comprising a body portion provided with a minute passage terminating in a jet orifice and with arms extending forwardly and provided with a plate at their outer ends lying directly opposite said orifice and spaced therefrom to form a chamber, whereby the gas stream issuing from said orifice produces a flame impinging upon said plate, and an air guiding member of annular form surrounding said arms and providing therewith inlet and outlet openings to said chamber.

3. A burner, comprising a body portion provided with a minute passage terminating in a jet orifice and with arms extending forwardly and provided with a plate at their outer ends lying directly opposite said orifice and spaced therefrom toform a chamber, whereby the gas stream issuing from said orifice produces a flame impinging upon said plate, and an air guiding member of annular form surrounding said arms and providing therewith inlet and outlet openings to said chamber, said annular member being of washer form with its general plane transverse to the length of the gas stream.

CLARENCE H. MORROW.