US2360167A

US2360167A - Temperature control apparatus

Info

Publication number: US2360167A
Application number: US483118A
Authority: US
Inventors: Alfred F Schumann; Alexander J Turpin
Original assignee: Hauck Manufacturing Inc
Current assignee: Hauck Manufacturing Inc
Priority date: 1943-04-15
Filing date: 1943-04-15
Publication date: 1944-10-10
Anticipated expiration: 1961-10-10

Description

Oct. 10, 1944. A. F. scHuMANN :TAL

TEMPERATURE CONTROL APPARATUS FiledfApril 15, 1943 sheets-sheet 1 IN V EN TORS A 1 FRED E S CHU/144 AWA/va 0t- 10, 1944 y A. F. svcHUMANN ET AL 2,360,167

TEMPERATURE CONTROL APPARATUS Filed April 15, 1943 4 2 sheets-sheet 2 a INVEN T0125 l b ALFRED /Scm/MANNA Nc BY L ExA/vpE/'Qd TURF/N l Il? A Patented Oct. 10, 1944 UNITED STATES PATENT QFFICE TEMPERATURE CONTROL APPARATUS Application April 15, 1943, Serial No. 483,118

1 Claim.

The invention relates to the control of the temperature prevailing within a combustion chamber, more especially to a chamber red by reaches its minimum limit of regulation, a further control is brought into operation by which a cooling medium is automatically applied to reduce the temperature the desired extent.

A further object of the invention is to provide an automatic control means which will effect regulation as well of the burner, the aforesaid cooling medium applying means being maintained ineffective until such time as a burner operating means has attained its minimum limit position.

In carrying out the invention, a suitable burner is provided for discharge into a combustion chamber, said burner being provided with the usual or special means for regulating the volume 'of combustible consumed by the burner between a maximum and a minimum value. In addition, provision is made for cooling as in providing the chamber with an admission opening for a gaseous cooling medium such as air, which opening is designed to be controlled for regulation of the volume of admitted air.

In accordance with the invention, there is associated with the aforesaid burner regulator means and with the means for controlling admission of air or like gaseous medium, a temperature responsive element and motor means controlled thereby, said motor means being designed to operate a pulley system. The latter, in turn, is connected with the operating element of the burner and also with the means for controlling the cooling medium, for example, a closure door or damper for the opening to the chamber. The pulley system to this end includes a movable pulley unit flexibly connected with the motor means for reciprocation thereby, said movable pulley having a cable running thereover, one end of `which is connected over a xed pulley to a p-redetermined mass and the other end over a second fixed pulley to a greater mass, both being suspended from the cable. The first-named connecting portion of the cable also is attached to the burner operating element to cause the same to move angularly in the regulation of the burner in accordance with the reciprocation of the cable portion, while the second-named connecting portion of the cable is attached to regulating means for the cooling medium, for example, to cause said medium to be applied or interrupted in accordance with the reciprocation of said lastnamed cable portion. Due to the relation of the two masses attached to the said respective ends of the cable portion, the lighter mass will be the rst to rise with movement of the movable pulley unit as the motor means operates under.

the influence of the temperature-responsive element in a direction to reduce the volume of combustible from the burner. When this combustible regulation attains a position for minimum supply of combustible, stop means will be engaged which will prevent further movement of the burner operating element in a direction to reduce volume of combustible.

The lesser mass will therefore no longer be elevated and continued pull on the pulley unit by the motor means will cause the heavier mass to rise, thereby operating the means regulating the cooling medium sufficiently to reduce the temperature such that the responsive element actuating the motor means will cause the latter to reverse the direction of movement of the movable pulley unit.

The nature of the invention, however, will best be understood when described in. connection with the accompanying drawings, in which:

Fig. 1 is a fragmentary front elevation of a heating chamber with attached burner and airadmission door, together with the automatically operating means for regulating the operation of said burner and air-admission door.

Fig. 2 is a fragmentary longitudinal section of the heating chamber and air-admission door, with burner shown in elevation and the automatically operating means omitted. 1

Fig. 3 is a perspective View indicating more o less diagrammatically the automatically operating means in position of maximum volume of combustible supply to the burner.

Fig.y 4 is a similar View with the various elements in their respective locations for operation of the burner under minimum supply of lcombustible, while Fig. 5 illustrates similarly the elements in their respective` locations for operation of the burner under minimum supply of combustible and with introduction of a cooling gaseous medium.

Referring to the drawings, more especially Figs. 1 and 2, lil designates a suitable combustion chamber whose temperature it is desired to maintain at a predetermined maximum value or through it the temperature of a mixture or bath I I in a vessel I2 through a pair of communicating pipe coils I3 and I4 respectively in the combustion chamber I6 and the vessel i2. The ccmbustion chamber is heated by discharging thereinto the products of combustion and/or name of a burner I5 of any well-known or special construction designed for variation, between limits, oi the volume of combustible. Such a burner may, for example, be of tltnature of the proportional burner set forth in U. S. Letters Patent Nos.

2,219,119 and 2,290,785 granted applicants assignee. Burners of this nature are operatedior regulation of the volume oi combustible sup-ply usually through the oscillation or" an angularly movable element or arm I6 between two positions as determined by suitable stops or lugs il and I8, respectively, the former being that for vmaximum supply of the combustible and the vlatter that for minimum supply thereof, all of Vwhich is well understood and formsnoparticulai part of the present invention.

Provision is made, however, to further control Y the temperature of the lcombustion chamber and/or the coil I3 therein by the introduction of a cooling medium, in the particular embodiment `atmospheric air, which is introduced through an opening I9 located, for example, below the burner. The location of this opening, however, may be rvaried to suit the particular conditions and various constructions of heating chambers. Nor- .mally, opening I9 is designed to be closed by a door 2li hinged at 2I so as to be capable of swinging outwardly to afford various areas of opening Vfor the introduction of air into the interior of i the chamber I0.

It will be understood that during the normal operationV of the heating chamber, door 2D will remain in its position to close the opening I9 and the regulation of the temperature within the heating chamber I0 will be effected solely by' properly positioning the element IS. f "In accordance with the invention, this is to be Aaccomplished automatically and by the same mechanism whereby further regulation (lowering) of the temperature is attained should the control effected by movement of the element I6 be insumcient to hold the temperature to the `predetermined maximum when element I6 has reached its minimum regulating position. This necessitates, in the rst place, a control system subject to the temperature prevailing within chamber I0, or, in the case of the embodiment hereindescribed, the temperature of the bath I I, which system maycomprisea heat-responsive member as a thermocouple 25. lThe thermocouple in turn being responsive to such temperatureis caused to actuate through a suitable controller means 26, as is well understood, a motor Vmeans f 21 which is connected, as hereinafter set forth, through a pulley system, with the element I 6 and also with a bracket 28 extending outwardly from Ythe door 20.

The pulley system for securing this connection to the two regulating elements for control of the temperature includes a movable pulley unit 3B the other portion 3S of the cable running over a` lixed pulley 40.

The operation of the control system is indicated in the diagrammatic representations, Figs. 3 to 5. Fig. 3 illustrates the location of the various members at normal operation with maximum supply Aof combustible tothe burner I5, the regulating arm I6 thereof being then in its extreme leftvhand position as limited by the lug or stop I l. When Vthe temperature within the vessel I2 attains the desired predetermined value, or the temperature suddenly rises, in the case of an exothermic reaction occurring in connection with the heating of a mixture, the temperature control hereinbefore described will operate in manner well understood to move said arm towardV the minimum position through the cable connections which connect it to the arm 32 of the controller system. Weightr33 is elevated thereby, allowing of this angular movement of arm I 6, but the weight 35, being of greater mass, will retain its position. This continues until arm I6 engages the lug or stop I8, and if this reduction in supply of combustible is insuicient to reduce the inte-v rior temperature of chamber IU to `the required degree, it will be apparent that other means must be provided to effect a reduction as the burner is of the continuously operating type with no shut-01T at minimum regulating positions, Ath'us avoiding the necessity for ignition controls and the like. In Fig. 4 this minimum position of the regulating arm IS-is indicated and it will be noted that the weight 35 still retains itsposition and that the weight 33.has been elevated `aporresponding distance, indicated at' (a), above the position for maximum supplyof combustible.

By the time arm I6 assumes its position of minimum regulation, further operation of ...the controller arm 32,in the direction for reduction of temperature will begin to elevate theweig-ht 35. This results from the fact thatfarmY I6,-in engaging with the stop I8, introducesan innite resistance with respect to the weight'33 whereby the continued pull on'pulley 3takes effect on the portion 36 of the cable and causes weight 35 to rise to the extent'of the travel of saidLpulley 30. The extent of this elevation is indicated at (b), Fig. 5, and the cable portion' 36, being connected with the closure member 20, movesthe same about ther hinge 2| Yto uncover the opening I9 and allow atmospheric air to be introduced therethrough to the interior of chamber I0 and elect the required cooling.

We claim:

The combination with a heating chamber having a burner Vfor' fluid combustible discharging thereinto, said burner being provided with control means for'regulating the volume Ofcombustible and including stops to limit saidmeans between a'maximum andaminimum operating value, the said chamber having also an opening for admission of a cooling medium, together with control means for regulatingk the area -o said opening; Jof means for operating the two 'said control means of the said chamber, comprising a temperature-responsive element and NVmotor means controlled thereby, and akpulley system including a movable pulleyconnected withjthe motor means to be reciprocated thereby, together with a cable running over the movable pulley, one portion thereof passing over a Xed pulley and having suspended from its end a predetermined mass and the other portion passing over a second' xed pulley and having suspended from its end a greater mass, said. rst-named connecting portion of the cable being connected with the burner control means and the second-named connecting portion with the cooling medium ad- 10