US3307403A - Thermal power element - Google Patents

Thermal power element Download PDF

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Publication number
US3307403A
US3307403A US521254A US52125466A US3307403A US 3307403 A US3307403 A US 3307403A US 521254 A US521254 A US 521254A US 52125466 A US52125466 A US 52125466A US 3307403 A US3307403 A US 3307403A
Authority
US
United States
Prior art keywords
boot
power member
guide
base cup
member guide
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
US521254A
Other languages
English (en)
Inventor
Thomas B Bernett
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.)
Dole Valve Co
Original Assignee
Dole Valve 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 Dole Valve Co filed Critical Dole Valve Co
Priority to US521254A priority Critical patent/US3307403A/en
Priority to GB58395/66A priority patent/GB1166280A/en
Priority to FR90750A priority patent/FR1507791A/fr
Application granted granted Critical
Publication of US3307403A publication Critical patent/US3307403A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K5/00—Measuring temperature based on the expansion or contraction of a material
    • G01K5/32—Measuring temperature based on the expansion or contraction of a material the material being a fluid contained in a hollow body having parts which are deformable or displaceable
    • G01K5/44—Measuring temperature based on the expansion or contraction of a material the material being a fluid contained in a hollow body having parts which are deformable or displaceable the body being a cylinder and piston
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/01—Control of temperature without auxiliary power
    • G05D23/02—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature
    • G05D23/021—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature the sensing element being a non-metallic solid, e.g. elastomer, paste

Definitions

  • This invention relates to a temperature responsive force transmitting device of the type having .a diaphragm or power member boot which is seated within the casing and more particularly relates to a novel means for sealing the boot about the power member and for preventing the entry of water or foreign materials into the casing through the power member guide.
  • Temperature responsive force transmitting devices of the type referred to in this invention generally employ a diaphragm or power member boot which has a peripheral bead compressed between a power member guide portion and a base cup of the casing.
  • a cavity containing a thermally expansible material is provided beneath the boot in the base cup and increases in ambient temperature result in an upward pressure on the boot for actuating a power member within the power member guide.
  • the thermally expansible material is sufiiciently expanded for causing the boot to occupy the entireregion within the power member guide.
  • tempera- "ture -l evels significantly below the operating range the thermally expansible material is sufiiciently expanded for causing the boot to occupy the entireregion within the power member guide.
  • thermally expansible material contracts below the volume :required to maintain pressure on the boot in the region of the power member guide.
  • the result has been the forming of a cavity within the guide and the entering of water and other foreign materials past the power memher and into the cavity.
  • the presence of foreign substances within the casing changes the effective expansion volume of the casing and thereby alters the start to open temperature of the device.
  • the result is a non-uniform operating characteristic.
  • FIG. 1 is a sectional view of a temperature responsive force transmitting device according to the present invention showing the orientation of a brace ring as disposed between outturned flanges of the casing half sections; and
  • FIG. 2 is an exploded view of the temperature responsive force transmitting device of FIGURE 1 for-more clearly illustrating the inter-relationship of the various components.
  • the temperature responsive force transmitting device of this invention comprises generally a casing assembled in two sections and a resilient power member boot having a peripheral bead sandwiched between those two sections and providing thereby a means for operating a power member.
  • the power member is slida-bly received within the upper or guide section of the casing and is also received internally of the resilient boot.
  • a thermally expansible material, such as expansible Wax, is contained within the lower half section of the casing beneath the resilient boot and expansion of the wax exerts a force on the boot for actuating the power member.
  • the thermal element of this invention is of the squeezepush type. This means that the power 'member is moved upwardly within its guide due to a compression of the resilient boot in response to an expansion of the thermally expansible wax contained within the lower half section of the casing. Since the resilient boot is not required to deflect upwardly along with the upward movement of the power member, no deflection space is needed within the power member guide and the boot structure can be caused to occupy the entire upper portion of the casing. In fact, by causing the boot to fill the entire upper section of the casing, an improved squeezing action is achieved in response to expansion of the temperature sensitive wax.-
  • a temperature responsive force transmitting device 10 is shown in FIGURES 1 and 2 as comprising a lower half casing or base cup 11 and an upper half casing or powermember guide 12.
  • a power member 13 is disposed within the guide and received internally within a resilient boot 14 which is positioned Within the casing defined by the cup 11 and the guide 12.
  • the cup 11 is filled with a thermally expansible wax 15 and is itself formed of a thermally conductive material.
  • the wax 15 may take the form of a pellet having a depression 19 which conforms essentially to the outer configuration of the base portion 20 of the resilient boot 14.
  • rises in temperature ambient the cup 11 will cause the wax 15 to expand. This expansion of the wax will be felt through the boot 14 for forcing the power member 13 to move extensively from the guide 12.
  • the power member 13 can be returned to a seated position within the boot 14 by a spring means or the like.
  • the base cup 11 has an outturned annular flange 16 and a vertical annular wall 17 having an inwardly chamfered lip 18.
  • the outturned flange 16 and the wall 17 cooperate to form the assembled device of FIGURE 1.
  • the flange 16 has a set of V-shaped concentric continuous grooves 21 positioned radially outwardly thereon.
  • the flange 16 is provided with a larger groove 22, which is formed radially inwardly of the grooves 21.
  • a bead 23 of the resilient boot 14 is disposed to overlie the V-shaped concentric grooves 21, and a brace ring 24 is provided with a flange 25 for being seated within the larger groove 22.
  • the brace ring 24- has a contoured face 26, which is cooperable with a complementarily contoured surface 27 of the boot 14.
  • the ring 24 therefore is fitted snugly about the boot 14 as shown in FIGURE 1 and the flange 25 is sandwiched between the flange 16 and the head 23, while the base portion Ztl of the boot is seated within the depression 19 of the thermally expansible pellet 15.
  • the base portion 20 of the boot 14 is maintained in spaced relation with the inner side wall 47 and the lower wall 4-8 of the base cup 11. This spaced orientation allows the flow of expansible wax about the entire lower surface of the boot to produce the necessary squeezing action for actuating the power member 13.
  • the configuration of the brace ring 24 is such as to maintain this spacing within the base cup 11, as well as to cause the boot 14 to occupy the entire internal volume of the power member guide 12 as shown in FIGURE 1.
  • the power member guide 12 has an outturned flange 28 and a rim or annular wall 29.
  • the flange 28 has a series of V-shaped concentric continuous grooves 319 formed radially outwardly thereon.
  • the side wall 31 of the outturned flange 28 is fitted within the annular wall 17 at the inner surface 32.
  • the V-shaped concentric grooves are radially displaced relative to the grooves 21. This displacement of the V-shaped grooves within the opposing flanges 16 and 28 aids in rigidly positioning the boot 14 within the casing by providing an improved grip at the head 23.
  • the power member guide 12 has a tapered wall section 33 which is received about a conforming tapered wall section 34 of the resilient boot 14. Likewise, the guide 12 has a cylindrical wall section 35 which is received about a cooperable cylindrical section 36 of the boot 14. Therefore, the interior of the power member guide 12 is provided to be substantially cooperable with the upper or neck portion 37 of the rubber boot 14 for assuring that the entire volume of the guide cavity will be occupied by the boot.
  • the power guide 12 has an additional sealing means in the form of additional V-shaped concentric grooves 38 which are formed within the cylindrical section 35. Also a space 39 is provided above the V-shaped grooves 38 for an anti-chafe ring 40 which is disposed between an end wall 41 of the guide 12 and the end Wall 42 of the boot 14.
  • the power member guide 12 has a bore 43 for receiving the cylindrically shaped power member 13 therethrough, and the resilient boot 14 has a well 44 for receiving the lower stern of the power member 13.
  • the power member 13 has a conical end portion 45, and the well 44 of the boot 14 has a spade shaped end section 46.
  • the end configurations 45 and 46 aid in initiating the squeezing action necessary to actuate the power member 13.
  • the bead 23 of the boot 14 is sandwiched between the outturned flanges 16 and 28 of the base cup 11 and the power member guide 12 for being extruded into the V-shaped grooves 21 and 28 as shown in FIGURE 1.
  • the diameter of the cylindrical section 36 of the boot 14 is substantially larger than the diameter of the cylindrical section 35 of the guide 12, and, therefore, the fitting of the guide 12 about the neck 37 of the boot 14 causes the boot material in the region of the cylindrical section 36 to be extruded into the V- :shaped grooves 38. Therefore, an effective seal is provided between the flanges 16 and 28 and between the boot 14 and the inner surface of the power member guide 12.
  • water or other foreign substances can enter the interior of the power guide 12 via the bore 43 along the surface of the power member 13.
  • the resilient boot 14 recedes from the end wall 41 at the interior of the power guide 12 and partly sags into the base cup 11, a cavity will be formed within the power guide 12 where the entering water or other substances can collect to interfere with further action of the device.
  • the presence of water in the power guide 12 can affect the operating temperature of the power member 13 by changing the effective volume of the interior of the device.
  • a constant volume at the interior of the device is required, as a calibrated quantity of wax 15 has been disposed within the base cup 11 to exert a given pressure on the resilient boot 14 at a given temperature. If the volume is affected, the pressure calibration will likewise be affected, and the device will operate unpredictably.
  • the brace ring 24 has been disposed within the groove 22.
  • a minimum force is exerted on the resilient boot 14 both in the direction of the power member 13 and in the direction of the end wall 41. Therefore, the wax pellet 15 has been transformed from a supporting means and a pressurizing means to a pressurizing means only, and extreme declines in ambient temperature do not encourage the entry of water into the guide 12.
  • a temperature responsive force transmitting device comprising:
  • a housing having a base cup portion and a power mem ber guide, said base cup portion containing a thermally expansible material and said power member guide having a guide opening formed therein;
  • said boot having a neck portion extending within said power member guide
  • a brace ring mounted within said housing and urging said neck portion of said boot against the wall of said power member guide forming said guide opening, whereby a seal is provided about said power member at said guide opening for preventing the entry of fluid and foreign substances into said power member guide.
  • a temperature responsive device as described in claim 1 wherein said brace ring is disposed about a periphery of said resilient boot and wherein said boot depends through said ring for contacting said thermally expansible material within said base cup of said housing.
  • a temperature responsive ring as described in claim 1 wherein said boot has a base portion depending with in said base cup and said power member extends internally of said boot into said base portion thereof wherein said brace ring is disposed tightly about said base portion of said boot and mounted within said housing for compressing said boot within said power member guide.
  • a temperature responsive force transmitting device comprising:
  • a base cup containing a thermally expansible material and having an outturned flange
  • a power member guide having an outturned flange mounted at said outturned flange of said base cup;
  • a power member mounted for rectilinear movement within said guide opening and disposed within said boot for being actuated by said thermally expansible material;
  • said boot being of the squeeze-push type and having a wall portion depending into the base cup and having a neck portion extending into the power member guide, said wall portion being tapered from a larger diameter in the vicinity of the flanges to a smaller diameter at points below the flanges;
  • brace ring mounted interiorly of said base cup and operably secured about said foot for biasing said boot into said power member guide, whereby said resilient boot is prevented from receding from said power member guide during conditions of low thermal expansion of said wax, and said brace ring having an arcuate profile depending from said flange into said base cup and lifting said resilient boot away from said thermally expansible material at low temperatures and urging said boot toward said power member and into said power member guide.
  • a temperature responsive force transmitting device constructed in accordance with claim 4 wherein a groove is formed within the bead engaging face of one of said flanges and said brace ring is fitted within said groove and compressed together with said bead between said flanges.
  • a temperature responsive force transmitting device as described in claim 5 wherein said brace ring has an outer edge supported within said groove and an inner edge spaced radially inwardly of the inner surface of said base cup for supporting said resilient boot in spaced relation with said base cup while biasing said boot into said power member guide.
  • a temperature responsive force transmitting device comprising:
  • a base cup formed of a heat exchange material and containing a thermally expansible material and having an outturned flange;
  • said resilient boot having a base portion depending into said base cup and a neck portion extending upwardly therefrom;
  • brace ring disposed Within said groove of said base cup flange and having an arcuate profile fitted snugly about said base portion of said boot;
  • a power member guide fitted tightly about said neck portion of said boot and having an outturned flange connected to said flange of said base cup for compressing said annular beadof said boot and said brace ring between said flanges;

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Temperature-Responsive Valves (AREA)
  • Sealing Devices (AREA)
US521254A 1966-01-18 1966-01-18 Thermal power element Expired - Lifetime US3307403A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US521254A US3307403A (en) 1966-01-18 1966-01-18 Thermal power element
GB58395/66A GB1166280A (en) 1966-01-18 1966-12-30 Improvements in or relating to Thermal Power Elements.
FR90750A FR1507791A (fr) 1966-01-18 1967-01-11 Dispositif de transmission de force sensible à la température

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US521254A US3307403A (en) 1966-01-18 1966-01-18 Thermal power element

Publications (1)

Publication Number Publication Date
US3307403A true US3307403A (en) 1967-03-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
US521254A Expired - Lifetime US3307403A (en) 1966-01-18 1966-01-18 Thermal power element

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US (1) US3307403A (fr)
FR (1) FR1507791A (fr)
GB (1) GB1166280A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3719085A (en) * 1970-11-23 1973-03-06 Robertshaw Controls Co Thermal power element
US4227412A (en) * 1979-04-16 1980-10-14 Eaton Corporation Temperature responsive actuator
US4644847A (en) * 1983-05-16 1987-02-24 Fluitron, Inc. Reduction of failure incidence of metallic diaphragms for compressors
US20110286494A1 (en) * 2008-10-27 2011-11-24 Sc2N Temperature sensor, manufacturing process and corresponding method of assembly
US11549596B2 (en) * 2017-01-19 2023-01-10 Neoperl Gmbh Diaphragm valve

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5505849B1 (ja) * 2013-10-31 2014-05-28 Ｓｍｃ株式会社 サーモエレメント及びサーモエレメントを組み込むサーモバルブ

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2507466A (en) * 1948-07-29 1950-05-09 Crane Co Unit providing mechanical movement responsive to temperature changes
US2797873A (en) * 1952-02-12 1957-07-02 Standard Thomson Corp Resilient telescoping diaphragm
US3016747A (en) * 1956-11-28 1962-01-16 Antioch College Squeeze-push power element
US3046787A (en) * 1958-10-06 1962-07-31 Robertshaw Fulton Controls Co Fusion type thermal element

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2507466A (en) * 1948-07-29 1950-05-09 Crane Co Unit providing mechanical movement responsive to temperature changes
US2797873A (en) * 1952-02-12 1957-07-02 Standard Thomson Corp Resilient telescoping diaphragm
US3016747A (en) * 1956-11-28 1962-01-16 Antioch College Squeeze-push power element
US3046787A (en) * 1958-10-06 1962-07-31 Robertshaw Fulton Controls Co Fusion type thermal element

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3719085A (en) * 1970-11-23 1973-03-06 Robertshaw Controls Co Thermal power element
US4227412A (en) * 1979-04-16 1980-10-14 Eaton Corporation Temperature responsive actuator
US4644847A (en) * 1983-05-16 1987-02-24 Fluitron, Inc. Reduction of failure incidence of metallic diaphragms for compressors
US20110286494A1 (en) * 2008-10-27 2011-11-24 Sc2N Temperature sensor, manufacturing process and corresponding method of assembly
US9039277B2 (en) * 2008-10-27 2015-05-26 Sc2N Temperature sensor, manufacturing process and corresponding method of assembly
US11549596B2 (en) * 2017-01-19 2023-01-10 Neoperl Gmbh Diaphragm valve

Also Published As

Publication number Publication date
FR1507791A (fr) 1967-12-29
GB1166280A (en) 1969-10-08

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