US2923797A - High temperature cut-off switch and immersed rod assembly for hot water generating tanks - Google Patents

High temperature cut-off switch and immersed rod assembly for hot water generating tanks Download PDF

Info

Publication number
US2923797A
US2923797A US669229A US66922957A US2923797A US 2923797 A US2923797 A US 2923797A US 669229 A US669229 A US 669229A US 66922957 A US66922957 A US 66922957A US 2923797 A US2923797 A US 2923797A
Authority
US
United States
Prior art keywords
tank
hot water
switch
water generating
threaded
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US669229A
Inventor
Floyd E Thelen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LUXRA Co
Original Assignee
LUXRA Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LUXRA Co filed Critical LUXRA Co
Priority to US669229A priority Critical patent/US2923797A/en
Application granted granted Critical
Publication of US2923797A publication Critical patent/US2923797A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0202—Switches
    • H05B1/0208—Switches actuated by the expansion or evaporation of a gas or liquid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/34—Means for transmitting heat thereto, e.g. capsule remote from contact member

Definitions

  • an improved simple fitting has been provided to extend through the customary and standard threaded opening in the tank for mounting of a temperature responsive switch at one end and a magnesium rod at the other end.
  • This is effected with a double threaded pipe fitting having an exteriorly threaded tank engaging portion and an internally threaded end to threadedly receive and connect an element thereto such as an internally suspended magnesium rod in water immersed relation to a hot water generating tank.
  • the exterior surface of the fitting is provided with a simple and eifective thermally responsive electric switch mounted thereon to quickly respond to temperature changes in the water to insure eflicient operation.
  • One object of the present invention is to provide a simple fitting having threaded portions for mounting of exteriorly and interiorly disposed operating elements in relation to a hot water generating tank.
  • Another object is to provide a cylindrical fitting with intermediate threads for mounting two operating elements in relation to a threaded tank opening serving as a support therefor.
  • Still another object is to provide a hot water generating tank with an externally threaded fitting having a threaded portion for connection thereto and another threaded inside end for mounting of elements in water immersed relation with a tank for mounting of a thermally responsive electric switch in efiective thermal communication with the water therein.
  • a further object is to provide a fitting having an ex- United States Pat ent O ternally threaded portion to serve as an exterior mount for a thermally responsive switch and an internally threaded end portion for suspended mounting of a magnesium rod in effective heat conducting communication between the water in the tank and the thermally responsive electric switch.
  • Still a further object is to provide a unitary fitting having a series of multiple threads to serve as a dual mount for a thremally responsive electric switch and a magnesium rod in immersed water relation to a hot water generating tank whereby the temperature of the contents is in communicating conductance with both the rod and switch.
  • Figure 1 is a front view in elevation of a hot water generating tank of the instantaneous type provided with a tank mount for an electric thermally responsive switch and a magnesium rod suspending portion embodying features of the present inventon, parts thereof being broken away and shown in section to clarify the showing.
  • Figure 2 is a sectional view in elevation of the dual fitting and mount taken substantially along line II-II of Figure 1.
  • Figure 3 is a plan view of the switch and mount viewed substantially from line III-III of Figure 2.
  • Figure 4 is a schematic wiring diagram showing the electrical relationship between the various elements for controlling the temperature of the water in the tank.
  • the present embodiment comprises a cylindrical upright tank 10 of galvanized steel construction or of the glass-lined variety which is disposed within a correspondingly shaped and somewhat enlarged jacket or casing 11 having insulation 12 packed therebetween in the chamber defined by the vertical walls and tops of the respective tank and jacket 10-11.
  • Y tank body 10 has a convex integral top 13 and a concave bottom 14.
  • the tank 10 has its slightly concave bottom 14 disposed immediately above a standard burner such as a gas burner 15 which communicates with a gas supply pipe 16 provided with an adjustable air regulating shutter of the conventional type (not shown).
  • a closure 17 is provided in the tank jacket or casing 11 immediately below the burner 15 for access thereto and to a pilot light (not shown) for hand lighting with a match.
  • a transparent sight 18 may be provided in the tank casing 11 to enable viewing the flame produced by the burner 15 while in operation to enable adjustment by regulating the air intake shutters (not shown) to the burner 15.
  • a cold water inlet pipe 19 threadedly connects with the top and extends downwardly for a considerable distance as at 20 for communication with the bottom interior region of the hot water generating tank 10.
  • a hot water discharge pipe 22 connects with the top of the tank 10 as at 23 for supplying the hot water to the pipe line.
  • a fusible plug 23 within the relief valve 24 connects with the top of the tank 10 as at 25, and normally precludes the flow of water through an overflow pipe 26-27 connected thereto for discharge to a sewer or other drainage point.
  • the heated water 28 within the tank 10 communicates with the fusible plug 23 which will melt and open the passage to the overflow pipe 26--27 in the 3 a, teventgthewater lzssshonld rise to a dangeroustemperttiture.
  • the externally threaded shank .31ris provided with an axial bore SS-which is interiorly threaded to receive the'upperthreaded extremity 34 of -an elongatedrrnagnesium rod-35 that extends downwardly orinwardly belowthetanktop 12 for immersiontinto -thewater 28 forthegreater partof the tank 10.
  • the magnesium rod.35 has.its. externally threaded upper extremity 34 complemental to theinternal .boresthreadt33 ,of-the-tshankfil to enable the threaded engagement of ,thenmagnesium rod 35 therewith for. in-' ternal suspension for most of the water depth .within. the tank 10. It will be apparent, therefore that the elongated magnesium-rod35 will conduct the most elevated temperature of theuppenstrataof'thewater 28 to the .body .of the fitting32, and .the enlarged surface thereof insidethe tank housing or jacket 12 and underneath the ...top insulationlZ will afford the efiective support of a ..thermostatic bellows typeswitch body 36, in this. instance of circular shallow configuration.
  • the switch body 36 is attached to the uppersurface -of the magnesiumrod fitting 32by means. of suitable fasteners 37 which extend through casing earsl38.
  • a ,convexlyleshaped thermallytresponsive bottorn.39 comprisingpart of the switcheasing, touches theffitting3'2 ,and becomesdistorted upwardly when the water temperal' .ture reachesua maximum of 205 degrees'Fahrenheit.which is the safety-limitttherefor.
  • its insulator vinterior lining 40 touches themetal terminal bridging .element'41.
  • thermocouple 46 and a solenoidtoperated thermostatic valve,mechanism-47.
  • the switch 41 opensthe circuit at '205 Fahrenheit to shut off the gas by de-energizing a .solenoid actuated thermostatically responsive valve in a manner well known inthe art.

Description

Feb. 2, 1 960 F. E. THELEN 2,923,797 HIGH TEMPERATURE CUT-OFF SWITCH AND IMMERSED ROD ASSEMBLY FOR HOT WATER GENERATING TANKS Filed July 1, 1957 VALVE. ME HANiM HIGH TEMPERATURE CUT-OFF SWITCH AND IM- MERSED ROD ASSEMBLY FOR HOT WATER GENERATING TANKS Floyd E. Thelen, Atchison, Kans., assignor to Luxra Company, Atchison, Kans., a corporation of Kansas Application July 1, 1957, Serial No. 669,229 3 Claims. (Cl. 200-137) This invention relates to a high temperature cut-ofl for hot water heaters and more particularly to electrical cutoffs therefor for attachment to magnesium rod fittings therefor, although it may be advantageously employed in connection with other fittings on hot water heaters.
tain the water temperature at safe maximum limits under all conditions.
Most every modern quality hot water heater is provided with a safety shut-ofi to insure the safe operation thereof should the gas pilot fail or the burner shut off or terminate the generation of hot water after reaching a pre-set temperature limit. Then, too, quality instantaneous hot water heaters are now equipped with magnesium rods to minimize the corrosion of the water tank and to add to the life thereof. This rod conducts the heat of the water very rapidly to the body of the tank, and particularly to the body top end thereof to provide the most effective temperature indicator response area thereof.
In ':'order to provide the most efiective temperature control of hot water generating tank heaters through the medium of a single opening therein, an improved simple fitting has been provided to extend through the customary and standard threaded opening in the tank for mounting of a temperature responsive switch at one end and a magnesium rod at the other end. This is effected with a double threaded pipe fitting having an exteriorly threaded tank engaging portion and an internally threaded end to threadedly receive and connect an element thereto such as an internally suspended magnesium rod in water immersed relation to a hot water generating tank. The exterior surface of the fitting is provided with a simple and eifective thermally responsive electric switch mounted thereon to quickly respond to temperature changes in the water to insure eflicient operation.
One object of the present invention is to provide a simple fitting having threaded portions for mounting of exteriorly and interiorly disposed operating elements in relation to a hot water generating tank.
Another object is to provide a cylindrical fitting with intermediate threads for mounting two operating elements in relation to a threaded tank opening serving as a support therefor.
Still another object is to provide a hot water generating tank with an externally threaded fitting having a threaded portion for connection thereto and another threaded inside end for mounting of elements in water immersed relation with a tank for mounting of a thermally responsive electric switch in efiective thermal communication with the water therein.
A further object is to provide a fitting having an ex- United States Pat ent O ternally threaded portion to serve as an exterior mount for a thermally responsive switch and an internally threaded end portion for suspended mounting of a magnesium rod in effective heat conducting communication between the water in the tank and the thermally responsive electric switch.
Still a further object is to provide a unitary fitting having a series of multiple threads to serve as a dual mount for a thremally responsive electric switch and a magnesium rod in immersed water relation to a hot water generating tank whereby the temperature of the contents is in communicating conductance with both the rod and switch.
Other objects and advantages will appear from a description of an illustrated embodiment of the present invention.
In the drawing:
Figure 1 is a front view in elevation of a hot water generating tank of the instantaneous type provided with a tank mount for an electric thermally responsive switch and a magnesium rod suspending portion embodying features of the present inventon, parts thereof being broken away and shown in section to clarify the showing.
Figure 2 is a sectional view in elevation of the dual fitting and mount taken substantially along line II-II of Figure 1.
Figure 3 is a plan view of the switch and mount viewed substantially from line III-III of Figure 2.
Figure 4 is a schematic wiring diagram showing the electrical relationship between the various elements for controlling the temperature of the water in the tank.
The structure selected for illustration is not intended to serve as a limitation upon the scope or teachings of the invention, but is merely illustrative thereof. There .may be considerable variations and adaptations of all or part of the teachings depending upon the dictates of commercial practice. The present embodiment comprises a cylindrical upright tank 10 of galvanized steel construction or of the glass-lined variety which is disposed within a correspondingly shaped and somewhat enlarged jacket or casing 11 having insulation 12 packed therebetween in the chamber defined by the vertical walls and tops of the respective tank and jacket 10-11. The
Y tank body 10 has a convex integral top 13 and a concave bottom 14.
The tank 10 has its slightly concave bottom 14 disposed immediately above a standard burner such as a gas burner 15 which communicates with a gas supply pipe 16 provided with an adjustable air regulating shutter of the conventional type (not shown). A closure 17 is provided in the tank jacket or casing 11 immediately below the burner 15 for access thereto and to a pilot light (not shown) for hand lighting with a match. A transparent sight 18 may be provided in the tank casing 11 to enable viewing the flame produced by the burner 15 while in operation to enable adjustment by regulating the air intake shutters (not shown) to the burner 15.
A cold water inlet pipe 19 threadedly connects with the top and extends downwardly for a considerable distance as at 20 for communication with the bottom interior region of the hot water generating tank 10. A hot water discharge pipe 22 connects with the top of the tank 10 as at 23 for supplying the hot water to the pipe line. A fusible plug 23 within the relief valve 24 connects with the top of the tank 10 as at 25, and normally precludes the flow of water through an overflow pipe 26-27 connected thereto for discharge to a sewer or other drainage point. The heated water 28 within the tank 10 communicates with the fusible plug 23 which will melt and open the passage to the overflow pipe 26--27 in the 3 a, teventgthewater lzssshonld rise to a dangeroustemperttiture.
30 provided centrally within the top 13 of the tank 10, areceives .an v externally threaded mounting vfitting D31, 1 in this tinstance havingra reduced exteriorlytthreaded shank :31. terminating in an enlarged hexagonal-flat,surfacehead 1 32: providing for the application of a'wrenchforrtightent ing engagement with the :tank aperture 29' by means of the threaded shank 31. The externally threaded shank .31ris,provided with an axial bore SS-which is interiorly threaded to receive the'upperthreaded extremity 34 of -an elongatedrrnagnesium rod-35 that extends downwardly orinwardly belowthetanktop 12 for immersiontinto -thewater 28 forthegreater partof the tank 10.
g To this end; the magnesium rod.35 has.its. externally threaded upper extremity 34 complemental to theinternal .boresthreadt33 ,of-the-tshankfil to enable the threaded engagement of ,thenmagnesium rod 35 therewith for. in-' ternal suspension for most of the water depth .within. the tank 10. It will be apparent, therefore that the elongated magnesium-rod35 will conduct the most elevated temperature of theuppenstrataof'thewater 28 to the .body .of the fitting32, and .the enlarged surface thereof insidethe tank housing or jacket 12 and underneath the ...top insulationlZ will afford the efiective support of a ..thermostatic bellows typeswitch body 36, in this. instance of circular shallow configuration.
The switch body 36 .is attached to the uppersurface -of the magnesiumrod fitting 32by means. of suitable fasteners 37 which extend through casing earsl38. A ,convexlyleshaped thermallytresponsive bottorn.39 comprisingpart of the switcheasing, touches theffitting3'2 ,and becomesdistorted upwardly when the water temperal' .ture reachesua maximum of 205 degrees'Fahrenheit.which is the safety-limitttherefor. In sotdoing, its insulator vinterior lining 40; touches themetal terminal bridging .element'41. toelevate it into contact with the normally closed--terrninals-4243 connected in series with the vlead wires 4445 (Figure 4) which are in circuit with a thermocouple 46 and a solenoidtoperated thermostatic valve,mechanism-47. The switch 41 opensthe circuit at '205 Fahrenheit to shut off the gas by de-energizing a .solenoid actuated thermostatically responsive valve in a manner well known inthe art.
, While I have illustrated and described a preferred embodiment of this-invention, it must beunderstood that .the invention is.capable of considerable variation and modification vwithout departing from the spirit of 'the invention. '1, therefore, do not wish to be limited to the ,.precise details .of constructionset forth, buttdesire to A central threaded aperture 29 in an upraised boss availmyself or such variations and modifications-weenie within the scope ot'the appended claims.
I claim: 1. -An integral unit fitting for an instantaneous hot water heater tank, comprising a plug member for detachable association with the top end wall of said tank for communication w-ith-the-sinterior thereof, said plug member having a fiat surface exterior for mounting of a heat responsive electrical' switch thereon in conductive relation therewith, a reduced threaded ,shank:i.depending from said flat surface plug member for engagement with a" complemental opening in the 1 topuend wall ofithe' hot water :heater tank, :there :being a bore .in said threaded shankrnemberclosedbysaid plug memberandopen at its bottom en'dforcommunication with the tank interior when in assemblediengagementtherewith, an elongated magnesium rod in anchored attachment at one end thereof with the bore in said threaded shank member of the plug member. for v suspended, support thereof Within the ,hotwatertheater tank'for ,substantiallytthe internal length ,thereof, and-athermally responsive xelectrical switch tmountedionvthetopflat surface ofsaidzplug member, saidiswitchsadaptedto be connected electrically in circuit iwith-anautomaticfuel shut-off valve controlling the fuel 25.supply to the burnerof the tank, said switch being in direct heatconductive connection with said magnesium rod 5 for effectively rendering said thermally responsive ..switchtin anopeniorclosed position depending uponzthe -ternperature ofnthe rod, whereby-an efiective electrical safety shut-off is -provided :asta part .of an integral unit ,fitting. V
2. The combination set forth in claim .1.wherein:1the electrically."responsive zshut-otf switch, is of the. flat; heat .responsive ..bellows type for .mechanically closing or maintaining theswitch open depending upon .the tempera- ,ture ofsaid magnesium-rod. i v
. .3. The, combination set forth .invclaim 2 wherein the thermally: responsive electrical switch, flat surface ,-plug ..member, andmagnesium rod-are fixedly and permanently -.attacheduintlongitudinal axial alignment relat-ive tothe ..latter .for assembly, as a unit with said tank.
RefereucesCited inthe' file of thispatent UNITED STATES PATENTS
US669229A 1957-07-01 1957-07-01 High temperature cut-off switch and immersed rod assembly for hot water generating tanks Expired - Lifetime US2923797A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US669229A US2923797A (en) 1957-07-01 1957-07-01 High temperature cut-off switch and immersed rod assembly for hot water generating tanks

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US669229A US2923797A (en) 1957-07-01 1957-07-01 High temperature cut-off switch and immersed rod assembly for hot water generating tanks

Publications (1)

Publication Number Publication Date
US2923797A true US2923797A (en) 1960-02-02

Family

ID=24685588

Family Applications (1)

Application Number Title Priority Date Filing Date
US669229A Expired - Lifetime US2923797A (en) 1957-07-01 1957-07-01 High temperature cut-off switch and immersed rod assembly for hot water generating tanks

Country Status (1)

Country Link
US (1) US2923797A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4253426A (en) * 1977-10-25 1981-03-03 Mitsubishi Denki Kabushiki Kaisha Reservoir type water heating device
US4385724A (en) * 1981-04-09 1983-05-31 Ramco Manufacturing, Inc. Apparatus for controlling the water temperature of a spa
US4669448A (en) * 1986-08-14 1987-06-02 Bradford-White Corporation Inner door for water heater
US4892064A (en) * 1986-10-27 1990-01-09 Zappia Joseph M Heat transfer and fluid heating device
US5347956A (en) * 1993-05-05 1994-09-20 Aos Holding Company Water heater with integral mixing valve
US5893521A (en) * 1996-11-19 1999-04-13 Bertain; John Paul Hot water safety discharge nozzle
US20130104814A1 (en) * 2011-10-28 2013-05-02 Mark Reyman Hot water heater with self-powered automatic pilot light

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1981299A (en) * 1933-09-01 1934-11-20 Grove W Harris Lighter for gaseous fuel burners
US2141775A (en) * 1935-09-18 1938-12-27 Harry A Richards Thermostatic device
US2312479A (en) * 1941-03-28 1943-03-02 William A Ray Control system
US2459123A (en) * 1946-03-21 1949-01-11 Cleveland Heater Co Water heating device with corrosion protective anode
US2566372A (en) * 1946-05-11 1951-09-04 Gen Controls Co Safety shutoff control system for gas burners
US2707738A (en) * 1952-11-14 1955-05-03 Siemens Ag Midget thermostatic switch

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1981299A (en) * 1933-09-01 1934-11-20 Grove W Harris Lighter for gaseous fuel burners
US2141775A (en) * 1935-09-18 1938-12-27 Harry A Richards Thermostatic device
US2312479A (en) * 1941-03-28 1943-03-02 William A Ray Control system
US2459123A (en) * 1946-03-21 1949-01-11 Cleveland Heater Co Water heating device with corrosion protective anode
US2566372A (en) * 1946-05-11 1951-09-04 Gen Controls Co Safety shutoff control system for gas burners
US2707738A (en) * 1952-11-14 1955-05-03 Siemens Ag Midget thermostatic switch

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4253426A (en) * 1977-10-25 1981-03-03 Mitsubishi Denki Kabushiki Kaisha Reservoir type water heating device
US4385724A (en) * 1981-04-09 1983-05-31 Ramco Manufacturing, Inc. Apparatus for controlling the water temperature of a spa
US4669448A (en) * 1986-08-14 1987-06-02 Bradford-White Corporation Inner door for water heater
US4892064A (en) * 1986-10-27 1990-01-09 Zappia Joseph M Heat transfer and fluid heating device
US5347956A (en) * 1993-05-05 1994-09-20 Aos Holding Company Water heater with integral mixing valve
US5893521A (en) * 1996-11-19 1999-04-13 Bertain; John Paul Hot water safety discharge nozzle
US20130104814A1 (en) * 2011-10-28 2013-05-02 Mark Reyman Hot water heater with self-powered automatic pilot light

Similar Documents

Publication Publication Date Title
US2923797A (en) High temperature cut-off switch and immersed rod assembly for hot water generating tanks
US2432169A (en) Electric immersion heater
US2784291A (en) Water heating device
US2411675A (en) Water heater
US1995846A (en) Automatic gas appliance
US1674369A (en) Electric liquid heater
US1932447A (en) Electric steam boiler
US1837597A (en) Water heater
US2292156A (en) Heat control
US1852261A (en) piatt
US2258696A (en) Storage water heater
US1182688A (en) Electric radiator.
USRE20380E (en) Control device
US3258005A (en) System for controlling degree of stratification in hot water heaters
US2096697A (en) Water heater
US2577694A (en) Heating apparatus
US2098498A (en) Fluid heater
US2099018A (en) Fluid heater
US1874969A (en) Gas controlling device
US2156458A (en) Temperature control for water heaters
US2128809A (en) Electric heater for steam radiators
US2049838A (en) Electric water heater
US2258336A (en) Heating system
US1437384A (en) Electric water heater
US2708231A (en) Electric water heaters