WO1983002157A1 - Temperature or pressure sensing element - Google Patents
Temperature or pressure sensing element Download PDFInfo
- Publication number
- WO1983002157A1 WO1983002157A1 PCT/GB1982/000345 GB8200345W WO8302157A1 WO 1983002157 A1 WO1983002157 A1 WO 1983002157A1 GB 8200345 W GB8200345 W GB 8200345W WO 8302157 A1 WO8302157 A1 WO 8302157A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- capillary tube
- capsule
- bellows device
- sensing element
- joint
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G12—INSTRUMENT DETAILS
- G12B—CONSTRUCTIONAL DETAILS OF INSTRUMENTS, OR COMPARABLE DETAILS OF OTHER APPARATUS, NOT OTHERWISE PROVIDED FOR
- G12B1/00—Sensitive elements capable of producing movement or displacement for purposes not limited to measurement; Associated transmission mechanisms therefor
- G12B1/04—Hollow bodies having parts which are deformable or displaceable under pressure, e.g. Bourdon tube, bellows
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/32—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by bellows
Definitions
- Temperature or Pressure Sensing Elemen This invention relates to the manufacture of temperature or-.pressure sensing elements, i particular sensing elements of the type comprising an expansible capsule or bellows device connected to a capillary .tube which is closed at its end remote from the capsule or bellows device to form a hermetically sealed system.
- Fluid filled hermetically sealed temperature sensing elements of the type referred to above are commonly employed in thermostatic controls and the like, the fluid filling of the sealed system comprising a gas, vapour, or liquid/vapour in equilibrium, according to the intended practical application and range of temperatures for which the element is to be used.
- the walls of the expansible capsule or bellows device are commonly made of spring steel and the capillary tube is most commonly made of copper.
- the capsule or bellows device is usually supported by a mild steel support plate in the region where the capsule or bellows device adjoins the capillary tube.
- the joint between the capillary tube and.the capsule or bellows device has to be mechanically strong and hermetically sealed- This joint is, in the known manufacturing technique, formed by soldering.
- the expansible capsule or bellows device is connected to a rigid support plate having an aperture through which the capillary tube passes, this aperture being sealed by the solder joint, which also forms a mechanical bond between the support plate and the adjoining end of the capillary tube.
- OMPI __ IPO alternative materials for the capillary tube attractive.
- the use of aluminium capillary tube in place of copper capillary tube has certain advantages, not least of which is a significantly lower.cost.
- a temper- -ature or pressure sensing element comprising an expansible capsule or bellows device connected to a capillary tube in which the capsule or bellows device is attached to a rigid support plate having an aperture through which the capillary tube passes, the capillary tube being secured to a surrounding part of the support plate and being hermetically sealed to the capsule or bellows device, characterised in that the capillary tube is bonded to the support plate and sealed to the capsule or bellows device by a synthetic resin-bonded joint.
- the capillary tube may be fabricated in, for example, aluminium, stainless steel or brass. Where aluminium is employed the capillary tube is preferably anodised, at least on its external surface.
- Various resins may be employed to form the resin bonded joint. An epoxy resin has proved satisfactory, preferably a single part epoxy resin which is heat-cured. The heat-curing of the resin joint assists the dehydration of the assembly.
- a further incidental advantage of employing resin as the bonding material is that no separate wire brushing step is necessary to remove flux residues.
- the resin bonded joint is preferably reinforced by a metal sleeve which surrounds the end of the capillary tube adjoining the capsule or bellows device and which is embedded at least partly in the resin of the joint.
- the capsule or bellows device may have a rigid base member having a tubular portion which projects through the - aperture in the support plate and which is swaged to attach • the base member to the support plate , the said tubular portion being embedded in the resin joint.
- the resin forming the j oint enters the tubular portion surrounding the end of the capillary tube , and forms an effective seal, between the capillary tube and the rigid base member , as well as sealing the goint between the capillary tube and the rigid support plate .
- the sensing element according to the invention is used for sensing temperature the capillary tube is closed at its end remote from the capsule or bellows device to form a hermetically sealed system.
- the present invention in another aspect provides a method of making a temperature sensing element in which one end of a capillary tube is connected to a support member of a diaphragm or bellows device by the formation of a resin-bonded hermetically sealed joint and the.
- FIG. 1 is a diagrammatic sectional view pf a temperature sensing- element fabricated by a known process according- to the prior art;
- Figure 2 is a diagrammatic sectional view, corresponding to Figure 1, illustrating a -temperature sensing element according to one embodiment of the present invention
- Figures 3 and 4 are diagrammatic sectional views, similar to Figure 2, illustrating alternative embodiments of temperature sensing elements according to the invention
- Figure 5 illustrates diagrammatically the sequence of operations in one method of sealing the end of the capillary tube in a temperature sensing element according to the invention
- Figure 6 illustrates diagrammatically an alternative method of sealing the end of a capillary tube in a temperature sensing element according to the invention.
- the same reference numerals are used to indicate the same or corresponding component parts.
- a flexible-walled expansible capsule or bellows device 1 is connected to a capillary tube 2 which is closed at its end remote from the bellows device 1 , forming a hermetically sealed system containining a gas, vapour or liquid/vapour filling.
- the bellows device 1 comprises two stainless steel diaphragms 3, 4 which are welded together peripherally.
- a rigid mild steel boss 5 is projection welded to a central part of the diaphragm 3 and acts as a force transmitting member for applying an actuating force to a thermostat or other mechanism (not shown) in response to temperature variations in the sealed system.
- a rigid base member 6 of mild steel is projection welded to a central part of the other diaphragm 4, which has a central hole 7 aligned with and slightly smaller in diameter
- the base member 6 is formed with an upstanding tubular portion
- the boss 5 and base member 6 of the bellows device are electroplated with nickel sulphamate to resist corrosion and assist welding.
- the mild steel support plate 9 is copper plated.
- the bellows device 1 is secured to the support plate 9 by swaging of the tubular portion 8, the diameter of the latter being slightly greater than that of the capillary tube 2.
- the capillary tube passes through the tubular portion 8 of the base member 6 and abuts the portion of the diaphragm 4 surrounding the hole 7.
- the capillary tube 2 is formed with a bend so that the end of the capillary tube which is joined to the bellows device 1 is perpendicular to the plane of the bellows device 1 and its support plate 9.
- the capillary tube 2 is anchored to the support plate 9 by means of deformable lugs 10 formed integrally with the support plate 9.
- the sealed end of the •capillary tube. is then swaged, crimped and fused to form a sealed tip 13.
- the completed and sealed temperature sensing element may be electroplated with tin prior to inspection.
- the present invention makes use of an alternative material for the capillary tube 2, in this example
- the aluminium tube 2 is . anodised on its external surface.
- the assembly of the temperature sensing element is similar to'that illustrated in Figure 1, except that the bonding of the capillary tube 2 to the support plate 9 is effected by means of a synthetic resin bonding material 14, in this case a single part epoxy resin.
- a suitable resin for this purpose is ESP 109 resin manu actured byPermabond Adhesives Ltd.
- the resin 14 forms a joint similar to the soldered joint 11 of Figure 1 , hermetically sealing the capillary tube both to the- support plate 9 and to the base member 6 of the bellows device 1. Curing of the resin is effected by heating, for example to 180 C for 20-30 minutes. The heat-curing of the resin also assists dehydration of the bellows device and capillary tube 2, avoiding the need for this as a separate step.
- a weld 16 is formed between the aluminium capillary tube 2 and the crimped end of the tubular, portion 8 of the base plate 6.
- This weld 16 which may alternatively comprise a soldered joint, is carried out before the formation of the resin bonded joint 14, and forms a preliminary seal.
- Figure 4 shows a further variant of the temperature sensing element illustrated in Figure 2 in which the reinforcing sleeve 15 is omitted, the joint 14 being formed with resin only.
- the end of the capillary tube 2 adjoining the bellows device 1 may be strengthened by the provision of a preformed bulge portion 17, as shown diagrammatically.
- the filling of the capillary tube 2 of the temperature sensing element, and its subsequent closure, can be performed in a single cold-forging operation when aluminium is used as the material for the capillary tube.
- One sequence of operations for closure of the capillary tube 2 is illustrated in Figures 5(a) -(d).
- the capillary tube 2 and its associated bellows device 1 is charged with fluid under pressure, in this example, refrigerant gas, from a charging manifold or reservoir 18 ( Figure 5(a)) with which the open end of the capillary tube 2 communicates through a seal 19.
- fluid under pressure in this example, refrigerant gas
- the crimping operation forms a cold-weld and is followed by parting of the capillary tube 2 at the site of the crimp 20.
- the closed end of the capillary tube 2 is then finally sealed by a cold-forging operation in which the end of the capillary tube 2 is inserted in a - die 21 and deformed by a punch 22 which acts axially on the closed end of the capillary tube 2, forming an enlarged sealed end 23 ( Figure 5(d)).
- the resulting sealed end 23 would not necessarily have an enlarged diameter as shown.
- An alternative method of closing and sealing the capillary tube 2 is illustrated in Figure 6, in which the cold-forging of the end of the capillary tube to form the enlarged end 23 is effected in a single operation.
- the end of the open capillary tube 2 is " inserted in the charging manifold 18 through the seal 19, as ⁇ iHustrated ' in Figure 5 (a) and is held firmly in a clamp or jaws.
- a punch 22 moves axially with respect to the end of the capiliary tube 2 and passes- through the charging manifold 18, through a further seal 24.
- the punch 22 cold-forms the enlarged end 23 of the capillary tube 22 in the manifold 18, immediately after the charging operation, forming a finished end 23 similar to that illustrated in Figure 5(d).
- the cold-forged sealed end 23 of the capillary tube 2 is stronger and less vulnerable to damage than the sealed capillary tube ends formed by the traditional method. Moreover, the joint between the capillary tube and the bellows device is stronger and more easily made than the traditional soldered joint.
- capillary tube materials which may be bonded using the method of the present invention are stainless steel, copper, brass and copper plated mild steel. Aluminium is," however, preferred because of its relative cheapness and its greater flexibility, rendering the sensing element easier to install.
- the capillary tube 2 in the temperature sensing element of the present invention is preferably pre- anodised, as stated previously.
- the coating material may be applied either as a precoat to the capillary or may be applied as a coating after the assembly of the sensing element.
- other environmentally compatible plating finishe may be applied to the other component parts of the sensing element according to the intended field of application.
- the finished end of the tube may be coated with solder in a solder-dipping step to seal any micropores in the surface of the capillary tube.
- the resin-bonding technique of the present invention to attach:-.one end of a capillary tube to a capsule or bellows device, the other end of the capillary tube need not necessarily be closed by a cold- forging operation as described.
- a resin bonding agent such as, for example, acrylic resin or the same resin as used to bond the capsule or bellows device to. the capillary tube.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP83500271A JPS58502065A (en) | 1981-12-08 | 1982-12-07 | Temperature or pressure sensing element |
DE823249267T DE3249267T1 (en) | 1981-12-08 | 1982-12-07 | TEMPERATURE OR PRESSURE SENSING ELEMENT |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08136976A GB2112306A (en) | 1981-12-08 | 1981-12-08 | Temperature or pressure sensing element |
GB8136976811208 | 1981-12-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1983002157A1 true WO1983002157A1 (en) | 1983-06-23 |
Family
ID=10526447
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1982/000345 WO1983002157A1 (en) | 1981-12-08 | 1982-12-07 | Temperature or pressure sensing element |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0095494A1 (en) |
JP (1) | JPS58502065A (en) |
DE (1) | DE3249267T1 (en) |
GB (1) | GB2112306A (en) |
IT (1) | IT8268432A0 (en) |
WO (1) | WO1983002157A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0150379A2 (en) * | 1984-01-27 | 1985-08-07 | Ranco Incorporated | Control device with expansible chamber actuator |
US20140091152A1 (en) * | 2012-09-28 | 2014-04-03 | Invensys Appliance Controls South America | Temperature sensor using aluminum capillary |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT245304Y1 (en) * | 1998-03-12 | 2002-03-20 | Ge Procond Elettronica Spa | PERFECTED THERMOSTAT |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2698766A (en) * | 1951-11-19 | 1955-01-04 | Cutler Hammer Inc | Pressure responsive power elements |
US3654578A (en) * | 1970-05-12 | 1972-04-04 | Gen Electric | Condition responsive switch mechanism |
DE2320141A1 (en) * | 1972-06-27 | 1974-01-17 | Springfield Instrument Co | BAROMETER BOX AND METHOD OF MANUFACTURING THE SAME |
DE2414813A1 (en) * | 1974-03-27 | 1975-10-09 | Karl Fischer | Temperature controller for electric appliances - has expansion capsule connected through capillary tube to temperature sensor |
GB2057686A (en) * | 1979-08-29 | 1981-04-01 | Univ Bath | Thermal Actuators |
FR2480938A3 (en) * | 1980-04-22 | 1981-10-23 | Ranco Inc | Capillary based temp. sensors with protective resin coating - pref. of polyester, epoxy or saponified EVA resin |
-
1981
- 1981-12-08 GB GB08136976A patent/GB2112306A/en not_active Withdrawn
-
1982
- 1982-12-07 JP JP83500271A patent/JPS58502065A/en active Pending
- 1982-12-07 IT IT8268432A patent/IT8268432A0/en unknown
- 1982-12-07 EP EP83900200A patent/EP0095494A1/en not_active Withdrawn
- 1982-12-07 DE DE823249267T patent/DE3249267T1/en not_active Withdrawn
- 1982-12-07 WO PCT/GB1982/000345 patent/WO1983002157A1/en not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2698766A (en) * | 1951-11-19 | 1955-01-04 | Cutler Hammer Inc | Pressure responsive power elements |
US3654578A (en) * | 1970-05-12 | 1972-04-04 | Gen Electric | Condition responsive switch mechanism |
DE2320141A1 (en) * | 1972-06-27 | 1974-01-17 | Springfield Instrument Co | BAROMETER BOX AND METHOD OF MANUFACTURING THE SAME |
DE2414813A1 (en) * | 1974-03-27 | 1975-10-09 | Karl Fischer | Temperature controller for electric appliances - has expansion capsule connected through capillary tube to temperature sensor |
GB2057686A (en) * | 1979-08-29 | 1981-04-01 | Univ Bath | Thermal Actuators |
FR2480938A3 (en) * | 1980-04-22 | 1981-10-23 | Ranco Inc | Capillary based temp. sensors with protective resin coating - pref. of polyester, epoxy or saponified EVA resin |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0150379A2 (en) * | 1984-01-27 | 1985-08-07 | Ranco Incorporated | Control device with expansible chamber actuator |
EP0150379A3 (en) * | 1984-01-27 | 1986-06-25 | Ranco Incorporated | Control device with expansible chamber actuator |
US20140091152A1 (en) * | 2012-09-28 | 2014-04-03 | Invensys Appliance Controls South America | Temperature sensor using aluminum capillary |
WO2014047710A3 (en) * | 2012-09-28 | 2014-06-05 | Invensys Appliance Controls South America | Temperature sensor using aluminum capillary |
Also Published As
Publication number | Publication date |
---|---|
EP0095494A1 (en) | 1983-12-07 |
JPS58502065A (en) | 1983-12-01 |
DE3249267T1 (en) | 1984-01-12 |
IT8268432A0 (en) | 1982-12-07 |
GB2112306A (en) | 1983-07-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0147091B1 (en) | Electrolytic capacitor with a hermetic seal | |
US4330924A (en) | Method of forming crimped tube joint | |
US5107095A (en) | Clam shell heater employing high permeability material | |
US4371199A (en) | Crimped tube joint | |
JP2647282B2 (en) | Probe assembly | |
US7130380B2 (en) | Extractor cup on a miniature x-ray tube | |
US4695124A (en) | Plastic optical fiber cable with ferrule | |
CN101341632B (en) | Integral bonding attachment | |
JP5631974B2 (en) | Glass-metal hermetic seal assembly and method for manufacturing glass-metal hermetic seal assembly | |
US5053595A (en) | Heat shrink sleeve with high mu material | |
US4889506A (en) | Solder delivery device | |
US5189271A (en) | Temperature self-regulating induction apparatus | |
EP1475218A1 (en) | Fusion-worked product of resin members and production method therefor and method of fusing resin members | |
WO1983002157A1 (en) | Temperature or pressure sensing element | |
CN108028097A (en) | Electric wire and interconnection module with terminal | |
JPH01310316A (en) | Spherical lens holding section in metal tubule and manufacture thereof | |
US4210479A (en) | Method for bonding a plastic tubing to a metal needle and the needle assembly formed thereby | |
US4186653A (en) | Bellows assembly and method of making the same | |
US2479047A (en) | Control | |
JPS5886428A (en) | Production of temp. sensor sealed in metallic tube | |
JPH0471173A (en) | Method of connecting connector terminal with cable | |
EP0692367A1 (en) | Method of fabricating a tank and method of fabricating a tank connector therefor | |
US20020100792A1 (en) | Process for joining metals | |
JPH05326118A (en) | Rod heater, manufacturing jig therefor, and manufacture of rod heater | |
JPS61156714A (en) | Manufacture of electronic parts |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Designated state(s): DE JP US |
|
AL | Designated countries for regional patents |
Designated state(s): FR |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1983900200 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 1983900200 Country of ref document: EP |
|
RET | De translation (de og part 6b) |
Ref document number: 3249267 Country of ref document: DE Date of ref document: 19840112 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 3249267 Country of ref document: DE |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 1983900200 Country of ref document: EP |