US1629116A - Heater - Google Patents

Description

May 17 1927 F. P. MUEHLENBECK HEATER l Filed Feb. 11. 1925 s sheets-sheet 1 l 1 I' i zy. L35 Y I l @a I u IF nl l Ff 2 l Q ,39W i o i' i, /0 il l l F lm l I l l @E i i M1? fg N ,Il y g; T

F. P. MUEHLENBECK HEATER May 17, 1927. v 1,629,116

Filed Feb. 11. 1925 5 Sheets-Sheet5 www@ i 20 ried away and Patented May '1927.

UNITED STATES .PATENTOFFICB FEED P. HUEHLENBECK, F CHICAGO, ILLINOIS, ASSIGNOB T0 EUGENE l OF CHICAGO, ILLINOIS.

HEATER.

Application led February 11, 1925. Serial No. 8,475.

This invention relates to improvements in heaters. The invention is here shown as embodied in a heater especially adapted for industrial usesl such as for drying enamels,

paints, lacquersand the like, baking castings, ovens, laundries, can dryers, wire dryers, and so forth. a

My improved heater is especially adapted for producing recirculation thus saving fuel. By the use of my heater it is possible to lproduce recirculation in ovens where japan, paint, lacquer, and varnishlike products are to be dried. Recirculation in such ovens has heretofore been considered impossible 0r quite dangerous due to the fire and the ever-present explosive gases. In dryv ing such products combustible gases are liberated in the process of drying. It has been found that the sooner these vapors are cardrying is effected. My 'improved heater is so deslgned that it may be made an integral part of a vapor utilization system with com-v plete combustion of the gas fuel taking place 25., in the first combustion chamber which is a made of circular baiiie brick. Beyond the -rst combustion chamber there is a second combustion chamber built of rectangular fire brick placed horizontally and vertically.

- 30 The combustible vapors and the excess a r required to burn them are introduced into the heater so that they mingle with the burning gases as they pass from the first combustion chamber to the second. At this point i l the products of combustion of the gas fuel lhave attained substantially their highest temperature. l Thus, the fresh air and the combustible -gases meeting the burning gases, makes it impossible for any dangerous vapors to pass without being instantly consumed. Because of this construction, it will be seen that the heater converts any dangerous combustible gases into productive heat and in addition eliminates 'all danger of fire or explosion within the oven. This follows from the fact that the combustible vapors are consumed substantially as rapidly as they form.

An observation window is provided on the heater in order to observe the degree of combustion at all times,ithus enabling the operator to increase or decrease the air suphazard destroyed, the quicker the ply accurately. The window is placed where combustion should. be entirely completed.

The heater is also equipped with an automatic gas shut-off. 'i

The above mentioned features, and other features and advantages of my invention will -appear more fully and be described more in detail as I ,proceed with my specifil cation.

In that form of device embodying the features of my invention shown in the accompanying drawings, Figure 1 is a view in side elevation of the heater, Fig.'2 is a top plan view of the same, Fig. 3 is a viewin end eleyation, Fig. 4 is an enlarged view showing 1n detall a part of the automatic shut-off, Fig. 5 1s a vertlcal sectional view, Fig. V6 is a lview taken as indicated by the line 6 of Fig.

5., Fig. 7 is a view taken as indicated by the line 7 of Fig. 5, Fig. 8 is a view taken as ind icated by the line 8 of Fig. 5, Fig. 9 is a v1ew taken as indicated by the line 9 of Fig. 5, and F1g. 10 is a view partly in side elevation andv partly in section showing the heater connected toa drying oven.

C. GMELIN.

In that form of device embodyingth'e fea- I turesI of my invention shown inthe accompanylng drawings, tlally rectangular 'casing or shell provided with the spaced inner and outer walls 11 and 12 respectively having between them any suitable non-combustible insulating subtance, as, for example, clay, as indicated In one end of the casing 10 there is provided a smaller axially arranged ractangularly casing 14 made of sheet metal or other suitable material and constituting a first combustion chamber. 4The casing 14 is lined with suitable refractory material, such as fire brick 15 provided with inwardly projecting staggered alternately vertically and horizontally arranged projecting lugs 16. 16 in order to better mix the 'gases to be burned and in order to give the products ofv combustion a tortuous passage therethrough.. 17 indicates a jet or nozzle through which the fuel is admitted such as illuminating i, gas, natural gas, or other inflammable gas. Surrounding the nozzle 17 are a series of air inlets 18 adapted to be opened or closed as desired by the rotatable shutter 19 so that 10 indicates a substan.

the desired. proportion of gas and air can the space 27 around the first combustion be admitted into the first combustion chamber 14. 20 indicates a pipe leading to the nozzle 17 through which the gas to be burned is conducted.

At the discharge end of the heater there is provided a blower or fan 21 which may be of any desired form and adapted to cause a circulation through the heater, so that gases and products of combustion in the heater will be drawn through the same from left to right as viewed in Fig. 1 and Fig. 5. The discharge outlet from the fan 21 is connected to a conduit 22 which leads to the bottom of an oven 23 as shown in Fig. 10.

In Fig. 10, the arrows indicate the travel of the heated gases and products of combustion coming from the heater. `Within the oven l0 there may be provided any suitable means such as the wire mesh shelves 24 for supporting the articles to be dried as indicated by 25. 26 indicates a conduit leading from the top of the oven to the heater 10. As clearly shown in Fig. 5, the conduit 26 enters the. top of the heater 10 above the inner combustionchamber 14 which is made smaller than the shell 11 thus affording a space 27 between the two.

Beyond the end of the first combustion chamber 14 therevis in the heater 10 what may be termed the second combustion chamber as indicated by'28. Within this chamber there are provided staggered alternately arranged vertical and horizontal bafiie bricks 29 in order to better commingle the inflammable gases.

Where the conduit 26 enters the heater there is provided a damper 30 which may be adjusted to regulate the flow of gases therethrough. At the lower side of the heater substantially opposite the point where the conduit 26 enters there is provided a fresh air inlet 31 provided with a regulating damper 32.

In the operation of the device, gas and air are admitted at 17 and 18 in order to give an infiammable mixture which is ignited and burns within the first combustion chamber 14 issuing from the right end thereof (as viewed in Fig. 5). The fan 21 operates to cause a suction of air through the ports 18 and also operates to cause a circulation through the hea-ter as explained before. The products of combustion acting as a drying medium are exhausted from the heater by the'fan 21 and blown into the oven 23 at the bottom whence they pass upwardly through the oven drying the articles 25. In cases where the articles 25 have been painted with lacquer, enamel, paint. or other substances so that during the drying process they give off combustible vapors, the following operation takes place. These combustible vapors are drawn out of theoven at the top through the conduit 26 and enter the heater into chamber. The combustion in this first chamber has heated the outer walls of it and consequently these combustible vapors entering through the conduit 26 into the space 27 become heated. The draft through the lieatercaused by the fan draws these combustible vapors into the second combustion chamber 28 where they become mixed with the burning gases issuing from the first combustion chamber; and thus they are ignited and burned in the second combustion chamber. Any additional fresh air required to aid in combustion is admitted through the fresh air inlet 31 by means of the valve 32. rIhe bafiie bricks 29 in the second combustion chamber 28 cause a thorough mixing of the combustible vapors and gases entering the heater through the conduit 26 with the burning gases issuing from the first combustion chamber 14 so that such combustible gases and vapors coming from the oven are completely burned up and thus all danger of explosion removed. The burning of' these combustible vapors also furnishes additional heat to the drying medium issuing from the heater and consequently aids in the drying process and also effects a saving of fuel.

There is also provided an automatic shutoff for the gas, and the construction and operation of this device will now be explained. Near the discharge end of the heater 10 there is provided a Swingable plate or vane 33 hinged at its upper edge on a mounting member as indicated by 34. This vane, when the heater is not in operation, hangs in a vertical positionas shown in Fig. 5. The vane is light enough, however, so that when the heater is in operation, it will beswung up into the substantially horizontal position at the top of the heater as shown in Fig. 4 by the flow of the gases through `the heater.

-The upper edge of the vane 33 is pivoted by means of a shaft 34 extending through the heater. One end of this shaft out-side of the heater is provided with a short lug 35 which takes a vertical position as shown in Fig. 4 when the vane is swung up against the top of the heater. On the pipe 20 carrying the gas to the heater there is provided a quick acting valve 36 controlled by a lever 37. To the end of the lever 37 there is attached a handle 38 and this lever 37 is also pivoted at 39 to the upper end of a piston rod 40 connected to a plunger in a dash pot41 which may be of any suitable construction. At 39 there is also pivoted a long arm 42 having at one end a notch 43 adapted to be engaged by the lug 35 on the shaft 34. This notch 43 is so spaced that it ywill be thus engaged only when the handle 38 is raised sufficiently to move the lever 37 to open the valve 36. When the lever 37 is down in substantially horizontal position as shown in Fig. 1, the valve 36 is closed. It is obvious that raisving the bananas to lift` the lever at o open.'

Lezama i until 1t is engaged bythe lug 35 as Shown in Fig. 4.

In the operation of the device, the fan is lstarted first. The velocity of the gases through the 'heater swings the damper or vane 3 3'from its vertical position to a horizontal position against the top of the heater. The handle 38 is then raised opening` the quick acting valve 36 and this valve is held open by engagement of the notch 43 with the lug 35. The gas issuing from thevnozzle 17 is then lighted and the proper air adjustment given by regulation of the shutter 19. A window 44 is provided near the discharge end ofthe heater in order to observe the combustion. The damper 32 is regulated to admit any fresh alr as desired in order to make com-plete combustion in the heater. If for any reason the fan should cease, to operate, the damper 33 w1ll fall,

' thus releasing the lug` 35'from the notch 43 allowing the handle 38 to ldescend and close the gas valve 36. The dash pot 41 is pro# vided in order to cushion the downward movement of the handle 348. Y

While Ihave shown and described cer- 1.

tain embodiments of my invention, it isfto 4be understood that it is capable of many modifications. Changes, therefore, in the construction and arrangement may be made without departing from the spirit and scope of .the invention as disclosed in the appended claims, in which it is my intention lto claim all novelty inherent in my. invention 'as broadly as possible in view ofthe prior art. What I claim as new, and desire to secure by Letters Patent, is: 1

1. An apparatus of the character specified having an endless passage therein, a blower for circulation of air 1n said passage, a

tion by thevaction of the blower, a cut-'off valve in said means adapted for manual opening independently of the vane and normally seeking a closed position, anda connectlng means between said' valve and vane to automatically engage the vane through opening movement of the valve to hold the valve -against closing influence.

2. In an apparatus of the character specified, a vane therein held in open position by pressure within the apparatus, a fuel supp'ly pipe for the apparatus having a cut-o valve, means opera le-manually to open the valve independently of the movement of the vane, comprising a lever connected to the valve, an arm member connected to the lever, said vane having a mounting member across which the arm member slides during A said movement, ,one of said members having a lug and the other member having a notch adapted to engage .through said movement to hold the valve against closing iniuence.

3. In an apparatus of the character specitied, a vane therein held in open position by pressure within the apparatusn'a fuel supply pipe for the apparatus having a cut-oli valve, means o erable manually to-open the valve indepen ently of movement of the v ary, 1925.

FRAED P. MUEHLENBECK.

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