US1875394A - Burner tip - Google Patents

Description

p 1932- v M. A. RICHFORD BURNER TIP Filed April 14, 1930 INVENTOR.

WYW

ATTORNEYS.

Patented Sept. 6, 1932 UNITED STATES- IAURICE A. RIOHFORD, OI OAKLAND, CALIFORNIA BURNER TIP- Application aied a i-n 14,

.' This invention relates'to gas burners of the Bunsen type and especially to an auxiliary burner tip whereby the main flame of the Bunsen burner is maintained.

. 5 Atmospheric pressure burners of the Bunsen'type such as used in laboratories and like places usually consist of a burner tube, a gas noz'z'le or tip whereby a mixture of gas and 'air is directed intothe burner tube and a base member supporting the tip and the tube. The nozzle or tipdirects a jet of gas into one end of the burner tube and the jet action of the. gascauses an induction of a sufiicient amount of air to produce a mixture of gas and 16 air which burns with ablue flame'from the opposite end of the burner tube.

Atmospheric burners of the Bunsen type operate vrysatisfactorily where soscalled artificial 6r manufactured gas is used; that 20' is, a gas'havingv acomparatively low E. t. 11. content, usually 400 to 600 B. t. u.s per cubic foot. Y The different kinds of flames, namely, reducing and oxidizing, are easily secured with this type of burner when using manufactured gas. However, when a gas having a high B. t. u. content is encountered, and especially natural gas with a content of, about 1100 B. t. u. per cubic foot, trouble is experienced in keeping the flame lighted. 80 When burning the gas in a sharp or oxidizing condition, the flame has a marked tendency to blow out at the slightest disturbances, such as drafts and movements. The reason for this is that natural gases do not contain free hydrogen, a rapid burning gas which imparts to manufactured gas a high rate of flame propagation. On the contrary, natural gas contains a large percentage of methane, the slowest burning of the commercial gases. The additional air required to yield a sharp flame with natural gas increases the speed of the gas and air mixture equal to or exceeding that of the velocity\of the flame propagation. The flame then becomes unstable and extinguishes or blows out very easily. In fact, an oxidizing flame with a moderately well defined inner cone often cannot be kept lighted even momentarily:

The object of the present invention is to generally improve and simplify the construc- 1930. Serial in. 444,102.

tion and operation of burners of the character described and. particularly to provide a burner which is capable of handling-natural gas without any danger of the flame becoming extinguished; to provide an auxiliary burnertip which is adapted to be/applied to burner tubes such as employed in laboratory burners and the like and which is adapted to 1 be applied in such a position as to supply a small auxiliary or pilot flame whereby combustion 'or burning of the main flame is insured; and further, to provide means where by a small portion of the gas and air mixture passing through the main burner tube is directed to the auxiliary burner tip and the flow of gas therethrough maintained'at low velocity.

The invention is shown by way of illustration in the accompanying drawing, in which: Fig. 1 is a side elevation of a Bunsen burner, showing the application of the auxiliary burner tip and Fig. 2 is a plan view of the main tubeand the auxiliary burner tip applied'thereto.

Referring to the drawing in detail, and especiall Fig. 1, A indicates a base member of suitab e construction, 2 a main burner tube, 3 a yoke whereby the burner tube is secured and supported with relation to the base, 4 a thumb screw engageable with the main burner tube to secure it and to permit vertical adjustment. 5 indicates a tube on the base which is adapted to be connected with a source of gas supply, and 6 a nozzle or gas tip where by gas is directed into the lower end of the main burner tube indicated at 2. The structure so far described is more or less common and illustrates Bunsen burners of the laboratory type. The invention forming the subject matter of the present application is the auxiliary burner tip indicated at 1. The tip is nothin more or lessthan a short sleeve which is rictionally or otherwise secured on the upper end of the main burner tube, the upper inner end of the sleeve is turned out. to form an annular surrounding chamber such as shown at 7, and this chamber is supplied with a mixture of air and gas through perforations 8 formed in the main burner tube. These perforations are preferably I m Wardly into the lower end of the mainburner tube and by its jet action induces a sufficient amount of air to form a mixture of gas and air which burns with a blue flame 1 from the'upper end of the tube. Natural gas contains a large proportion of methane gas,

and this is rather difficult to burn in atmosillustrated. It will, however, readily .burn

' if supported by an auxiliary flame. In the present instance a mixture of gas and air a under a relatively hi h velocity discharges from the upper end of the tube and will under ordinary circumstances not burn as the flame leaves the upper end of the tube. In the i present instance a small portion of the mixture is diverted by the inwardly extending I baffle members 9 and directed through the perforations 8 into the annular chamber 7. Themixture thusv diverted discharges atlow velocity through the upper end of the an-' nular chamber and there unites with the main V flame and insures continuous burning thereof.

The pilot light or flame is ring-shaped, due

to the formation of the annular chamber; and due to the low velocity of the gas passing therethrough the flame will stick tightly to the tip and thus give continuous ignition to the fast moving gas and air mixture leaving the main burner tube.

WVhile certain features of the present invention are more or less specifically described, I wish it understood that various changes may be resorted to within the scope of the appended claims. Similarly, that the materlals and finishes of the several parts employed may be such as the manufacturer may decide, or varying conditions or uses may demand. I Having thus described my invention, what I claim and desire to secure by Letters Pat ent is 1. In a burner of the character described,

N an elongated main burner tube, means adjacent one end of the tube for supplying 'a mixture of gas and air, a sleeve secured to V the opposite end of the tube and forming an annular chamber exterior to the main tube, said main tube having perforations formed therein in communication with the annular chamber, and a plurality 'of halide members interior of the main tubeiwherebya small portion of the gas and air mixture discharging therethrough is diverted through the perforations into the annular chamber.

- 2. In a burner of the character described,

'a m ain elongated burner tube of substantially uniform'diameter throughout its length and having an unobstructed inlet and outlet atphe'ric pressure burners of the type here

Images