CN1134807C - Improvements relating to thermal controls for electric heating elements - Google Patents
Improvements relating to thermal controls for electric heating elements Download PDFInfo
- Publication number
- CN1134807C CN1134807C CNB998069116A CN99806911A CN1134807C CN 1134807 C CN1134807 C CN 1134807C CN B998069116 A CNB998069116 A CN B998069116A CN 99806911 A CN99806911 A CN 99806911A CN 1134807 C CN1134807 C CN 1134807C
- Authority
- CN
- China
- Prior art keywords
- heat sensor
- transducer
- fusible material
- push rod
- contact
- 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 - Fee Related
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/002—Thermally-actuated switches combined with protective means
Landscapes
- Thermally Actuated Switches (AREA)
Abstract
A contactstat thermal sensor comprises a snap acting disk bimetal housed under a thermally conductive end cap fitted to a sensor body and operating a set of primary switch contacts via a push rod. For providing secondary protection, operable in the event that the primary protection afforded by the bimetal fails to operate, the moving contact of the primary switch contacts is provided at one end of a spring metal beam and the other end of the beam is held down, against its spring bias, in electrical contact with a terminal part of the sensor by means of a fusible rod arranged to melt and release the spring metal beam, thereby disrupting the electrical path through the sensor, in the event that the fusible rod is subjected to a temperature above the normal operating temperature of the bimetal.
Description
Technical field
The present invention relates to the improvement of the thermal control of electric heating element, special (but not exclusive ground) relates to the improvement of our disclosed device in UK Patent Application No.9717144.1 (1997,8,12 submit to) and No.9724382.8 (1997,11,18 submit to).
Background technology
In above-mentioned the applicant's UK Patent Application No.9717144.1, described being applicable to and being installed to the plane heating element particularly on the thick-film heating element, and on selected diverse location, be provided with the various base or the bearing of a plurality of heat sensors with it combinedly.Wherein said embodiment comprises the equipment entrance connector of going into opening connector based on the Otter Controls CPT of current manufacturing, this is a kind of not connector of the equipment of rich electric wire that is used for, it can make this equipment be set on any two rotation directions by its base, but have a collection of limb shape spare complete at grade according to different directions from then on connector stretch out, each limb shape spare all is used for one or more heat sensor is mounted thereon the diverse location place.The basic principle of this invention of UK Patent Application No.9717144.1 is to locate on the plane heating part for transducer flexibility is provided, especially in order to adapt to the different requirements of distinct device manufacturer.
The heat sensor that proposes to adopt a kind of simple contact devices type in UK Patent Application No.9717144.1 is as the transducer that is installed on the limb shape spare, and it is well suited in the typical contact devices type heat sensor of this purpose then to have described a kind of energy in the applicant's UK Patent Application No.9724382.8.Just as described therein, this contact heat sensor comprises the bi-metal plate of dish, it just moves between two relative dish-shaped configurations with quick acting when the temperature that detects rises on the intended level, and the motion of this bi-metal plate is passed to the pair of switches contact by push rod.
The described contact heat sensor of UK Patent Application No.9724382.8 only provides the protection of first order heat; also promptly when first order protection inefficacy (even unlikely); for example because this bi-metal plate or switch contact welded together when damaging, there is no the protection that the second level or reserve level may be provided.
Summary of the invention
Main purpose of the present invention is to provide a kind of like this heat sensor of contact-type, it comprises a bimetallic actuator that can move with snap action that is dish shape bi-metal plate form in two opposite dish shape configurations, this bimetallic actuator is arranged in one group of switch contact of operation in the operate as normal of this transducer, when being subjected to the temperature of the normal working temperature that is higher than this bi-metal plate, this fusible material simultaneously can disconnect this circuit and wherein parts that comprise fusible material are arranged to lose efficacy by this transducer when the first order protection that this bimetallic actuator and switch contact provide, it is characterized in that, this group switch contact is arranged to and can be operated by a push rod, the periphery that this push rod responds described bi-metal plate coils in the motion during quick acting between two opposite dish-shaped configuration at this, one end collaborative work of this push rod and the slender spring piece that on a bearing, extends, this bearing is used for to the pressurization of this spring part, the other end of this spring part then with above-mentioned fusible material parts cooperating to determine the state of aforementioned circuit; Described bearing is between an end and the other end of described slender spring piece.
According to of the present invention will be in the exemplary embodiments that describes in detail later, described first order switch contact comprises the moving contact of a fixed contact and on spring metal plate one end, the bar that the other end of this plate is formed by meltable thermoplastic material keeps the electric terminals portion of contact heat sensor therewith to become to electrically contact, and this metallic plate is closed into an end of this plate and its other end just is pressed onto on the bearing when contacting with above-mentioned electric terminals portion when this first switch contact.When described bi-metal plate actuator is worked, above-mentioned push rod allows an aforementioned end of described plate to rebound from the fixed contact of this device, do not remain closed in the contact at the above end place of this plate if this situation occurs, then the temperature of Sheng Gaoing will make the thermoplastic material bar soften and can allow the aforementioned other end of plate rebound from electric terminals portion.
The detailed description of doing referring to accompanying drawing below the research can be understood above-mentioned advantage with other of the present invention better.
Description of drawings
Fig. 1 is the exploded perspective illustration that embodies contact heat sensor of the present invention;
Fig. 2 is the cross-sectional figure that shows the contact heat sensor of understanding the Fig. 1 under the assembled configurations.
Embodiment
Referring to Fig. 1, contact heat sensor shown in it comprises dish-shaped bi-metal plate 1, push rod 2 and pair of switches contact 3 and 4 of self-return, contact 3 constitutes the moving contact of this switch contact and leans against on the pressed metal terminal part 6 of this transducer, contact 4 constitutes the fixed contact of switch, and is fixed on the pressed metal terminal part 6 of device.
The body 7 of this transducer is formed by the plastics or the ceramic material of heatproof, and a hole 8 that is used for installing push rod 2 is arranged.Bi-metal plate 1 is installed on the top of above-mentioned body 7 in the cover 9 of pressed metal, and it for example is to be formed by copper or aluminium, is fit to be attached to the upper end of body 7.As shown in Figure 2, bi-metal plate 1 is positioned under the cover 9, is set on push rod 2 upper ends on the one side and it is radially on the kick 10 on the opposite side with its edge.The dimple 11 that covers 9 central authorities has formed and the adjacent surface that coils 1, and can the operation of adjustment disk 1 by the deformation adjustment of cover.
One second body 12 of this heat sensor is fit to and aforementioned first body 7 is fitted together so that plate 5, terminal part 6 and another terminal part 13 are remained between this two body portion.These two terminal parts 6 and 13 have part 14 and 15 respectively, they when body 7 just extend to when 12 fit together outside the transducer body and with thick-film heating element on set terminal pad become Elastic Contact, the temperature of this heating element is then by this heat sensor control.
Cover 9 have one radially extension 16 be designed to hold for example upper end of thermoplastic material bar 17 of fusible material, in body 7, form simultaneously a hole 18 and enter the inner room that when body 7 and 12 fits together, defines with the lower end that allows bar 17.As shown in Figure 2, what the lower end abutment of bar 17 spring metal plate 5 is loaded with the relative end of that end of movable switch contact 3 with it, plate 5 turns in these relevant 19 places, end, locatees reliably with relevant plate end 19 to guarantee bar 17, guarantees to have only responsive to axial force on bar 17 simultaneously.
Be provided with positioning tab 20 on the long edge of plate 5, they cooperate with set form part 21 on body 7 and 12, when this heat sensor of assembling plate 5 are located with closing.Body 12 is provided with a riser 22,, adds the position that the described other end compares more near end 19 with the motion contact 3 that is loaded with this switch and apply thrust upwards on plate 5 at (later described) appropriate time with table.
As shown in Figure 2, what wherein show is the situation of this heat sensor under the normal state of cooling, cause under not pressured state shown in Figure 1, being straight plate 5 when assembling this heat sensor, between its moving contact bearing end (at this because dish 1 remain under the state of the closing of contact) and its other end 19 (at this because its upper end contact cover 9 is that fusible material bar 17 keeps down), keep down, and extend on the setting formation part 23 on the pressed metal terminal part 13 and also contact with it with effect of push rod 2.Under this state of heat sensor, between two terminal parts 14 and 15, can there be electric current to flow.
Crossing under the thermal environment, for example causing bi-metal plate 1 Fast transforms under its opposite dish-shaped configuration, this motion of dish 1 will make moving contact 3 leave from fixed contact 4 bullets usually, and contacting between the formation part 23 on the other end 19 that does not disconnect plate 5 and the terminal part 13.If but this situation do not occur, for example, arrive relevant heating member, just and the temperature of this electric heating element can continue to rise because dish 1 ftractures because switch contact 3,4 prickers close, and then electric current will continue to flow through heat sensor.Meltable bar 17 is named a person for a particular job softening or fusing at some; the end 19 that causes plate 5 will electrically contact with formation part 23 disengagings that are located on the terminal part 13; like this, this meltable bar 17 just provides the protection of the second level or reserve level, and this protective device can work when the first order protection that is provided by dish 1 is lost efficacy.
On above-mentioned lower body 12, be provided with and form part 24, can make the bearing described in heat sensor and the aforementioned UK Patent Application No.9717144.1 combined.
Aforesaid riser is in the heat sensor that is under the cooling condition shown in Figure 2, can or can not contact with plate 5, because with this understanding, the conflict of the effect of the end 19 of 17 pairs of plates 5 of meltable bar and plate 5 and the formation part of holding up from terminal part 13 23, will be pressurized to plate 5 is enough to guarantee that switch contact 3,4 normally works.But when bar 17 softens under the protected mode of the second level of this heat sensor or melts; plate 5 just begins to spring back to its common straightened condition; thereby just disconnected the end 19 of plate 5 and formed electrically contacting between the part 23; only be that plate 5 will produce a vitality with contacting just of riser 22, cause plate 5 to continue resiliences and the electric slit of between plate 5 and terminal part 13, opening a safety.If this riser 22 does not contact with plate 5 under the state of cooling of heat sensor, the end 19 of plate 5 and the power between the formation part 23 on the terminal part 13 will optimizations, thus for make these parts can electrically contact better silver-plated way become unnecessary.
Described and illustrated in the geometry of device made at heat sensor in the state of cooling following time have very strong masterpiece to be used on the meltable bar 17 and have more weak masterpiece to be used on the push rod 2, from bi-metal plate, can reflect lower actuation force.The advantage of this structure is can be that plate 5 causes that in the very high power of part acquisition that forms between part 23 and the plate end 19 meltable bar 17 is out of shape from short stiffness spring spare under suitable temperature.In case distortion beginning, riser 22 just from long and to have more flexible spring be that the part of plate 5 between formation part 22 and plate end 19 provides lower power, are out of shape bar 17, to open a safe slit between terminal part 13 upper plates 5 and drip molding 23 fully.
Although with reference to a specific embodiment the present invention has been described in the above, but should be fully recognized that described embodiment is exemplary at it aspect all, and the one skilled in the art is not deviating from the present invention in spirit and scope that the appended claim book outlines, can make all improvement and change form.For example, though meltable bar 17 preferably forms by the thermoplastic material of insulation because it will contact with the plate 5 of electrical current carriers, it also can in be provided with the suitable eutectic alloy material formation of insulating barrier.In addition, meltable bar 17 can be arranged to make the upper end of this bar directly to touch mutually with electric heating element rather than keep or be captured in radially within the extension 16 in the use of heat sensor.In this case, plate 5 is under the separate state of this heat sensor that is the effect that did not stress before it is coupled on the electric heating element, and just think just can be under the effect of power when this heat sensor is assembled to electric heating element, this assembly will impel bar 17 to be driven into vertically within this heat sensor, and make the end 19 of plate 5 crooked on the riser on the terminal part 13 23.
Claims (9)
1. a contact heat sensor, it comprises a bimetallic actuator that can move with snap action that is dish shape bi-metal plate form in two opposite dish shape configurations, this bimetallic actuator is arranged in one group of switch contact of operation in the operate as normal of this transducer, when being subjected to the temperature of the normal working temperature that is higher than this bi-metal plate, this fusible material simultaneously can disconnect this circuit and wherein parts that comprise fusible material are arranged to lose efficacy by this transducer when the first order protection that this bimetallic actuator and switch contact provide, it is characterized in that, this group switch contact is arranged to and can be operated by a push rod, the periphery that this push rod responds described bi-metal plate coils in the motion during quick acting between two opposite dish-shaped configuration at this, one end collaborative work of this push rod and the slender spring piece that on a bearing, extends, this bearing is used for to the pressurization of this spring part, the other end of this spring part then with above-mentioned fusible material parts cooperating to determine the state of aforementioned circuit; Described bearing is between an end and the other end of described slender spring piece.
2. the described contact heat sensor of claim 1, wherein said transducer comprises that one is provided with the transducer body of heat-conducting metal cover, this bi-metal plate then remains between this cover and the body, described cover portion is shaped as and can determines a seat part, and this seat part then limits the position at this bimetallic center.
3. the described contact heat sensor of claim 2, wherein said cover can be out of shape the position of regulating this bearing.
4. the described contact heat sensor of claim 1, the wherein said parts of fusible material that comprise comprise a push rod, whether this push rod matches with the described other end of above-mentioned slender spring piece, electrically contact to determine to have formed between this slender spring piece and this conductor.
5. the described contact heat sensor of claim 4, wherein said fusible material push rod make described spring part crooked on a standing portion of aforementioned conductor.
6. the described contact heat sensor of claim 5, the standing portion of wherein said conductor with respect to the described end of above-mentioned spring part more near its described other end.
7. the described contact heat sensor of claim 5 wherein is provided with riser in the body of described transducer, and this riser is used as and the interactional bearing of described spring part in disconnecting foregoing circuit.
8. the described contact heat sensor of claim 1, wherein said fusible material parts are arranged at outside the above-mentioned bi-metal plate periphery.
9. the described contact heat sensor of claim 8, wherein said fusible material parts so are provided with, its use has the transducer of heater block, one end parts of described fusible material parts is in abutting connection with described heater block, described transducer and described heater block are arranged in juxtaposition so that described fusible material parts are driven among the described transducer, thereby described elongated spring members is compressed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9807924.7 | 1998-04-14 | ||
| GB9807924A GB2338110B (en) | 1998-04-14 | 1998-04-14 | Improvements relating to thermal controls for electric heating elements |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1304539A CN1304539A (en) | 2001-07-18 |
| CN1134807C true CN1134807C (en) | 2004-01-14 |
Family
ID=10830322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB998069116A Expired - Fee Related CN1134807C (en) | 1998-04-14 | 1999-04-14 | Improvements relating to thermal controls for electric heating elements |
Country Status (7)
| Country | Link |
|---|---|
| EP (2) | EP1072048B1 (en) |
| CN (1) | CN1134807C (en) |
| AU (1) | AU3435499A (en) |
| DE (2) | DE69928517T2 (en) |
| GB (2) | GB2373926B (en) |
| HK (1) | HK1038829A1 (en) |
| WO (1) | WO1999053513A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2504753Y (en) * | 2001-10-25 | 2002-08-07 | 邵志成 | Socket with improved temp induction control structure |
| GB2382465B (en) * | 2001-11-14 | 2005-07-13 | Otter Controls Ltd | Improvements relating to thermally-responsive switches |
| CN1186703C (en) * | 2002-01-14 | 2005-01-26 | 邵志成 | Temp controller, electric connector and electric water heater |
| CN100356652C (en) * | 2005-09-26 | 2007-12-19 | 常熟市天银机电有限公司 | Overload protector of single-phase AC motor |
| DE102007017366B3 (en) * | 2007-04-12 | 2008-09-18 | Cherry Gmbh | Electric switch |
| CN102969199B (en) * | 2012-11-26 | 2015-01-28 | 佛山市天朋温控器有限公司 | Snap-type thermostat |
| CN103367035A (en) * | 2013-05-24 | 2013-10-23 | 亮群电子（常熟）有限公司 | Open temperature controller and production process thereof |
| CN103824727B (en) * | 2014-01-14 | 2015-12-23 | 佛山市天朋温控器有限公司 | A kind of Kick type temperature controller and method for packing thereof |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2339674C2 (en) * | 1973-08-04 | 1989-09-21 | Thermostat-und Schaltgerätebau GmbH & Co KG, 8730 Bad Kissingen | Temperature regulator with fusible metal fuse |
| US3943480A (en) * | 1974-12-18 | 1976-03-09 | Therm-O-Disc Incorporated | Thermostat |
| DE2826205C2 (en) * | 1978-06-15 | 1986-11-20 | Inter Control Hermann Köhler Elektrik GmbH & Co KG, 8500 Nürnberg | Thermal fuse for electrical devices |
| IT1110797B (en) * | 1979-01-29 | 1986-01-06 | Eaton Spa | THERMOSTAT, PARTICULARLY BIMETAL, WITH SAFETY SWITCH |
| US4472705A (en) * | 1983-01-03 | 1984-09-18 | Elmwood Sensors, Inc. | Thermostatic switch with thermal override |
| EP0271345A3 (en) * | 1986-12-12 | 1988-09-07 | Texas Instruments Incorporated | Miniature adjustable thermostat with integral over-temperature protection |
| DE3735334A1 (en) * | 1987-10-19 | 1989-04-27 | Thermostat & Schaltgeraetebau | THERMALLY CONTROLLED ELECTRICAL SWITCHING DEVICE |
| GB8807563D0 (en) * | 1988-03-30 | 1988-05-05 | Strix Ltd | Electric immersion heaters |
| FR2656952B1 (en) * | 1990-01-05 | 1995-04-14 | Seb Sa | CIRCUIT BREAKER INTEGRATED WITH A THERMOSTAT FOR ELECTRICAL APPLIANCE. |
| GB9105111D0 (en) * | 1991-03-11 | 1991-04-24 | Otter Controls Ltd | Improvements relating to thermally-responsive switches |
-
1998
- 1998-04-14 GB GB0216281A patent/GB2373926B/en not_active Expired - Fee Related
- 1998-04-14 GB GB9807924A patent/GB2338110B/en not_active Expired - Fee Related
-
1999
- 1999-04-14 EP EP99915934A patent/EP1072048B1/en not_active Expired - Lifetime
- 1999-04-14 AU AU34354/99A patent/AU3435499A/en not_active Abandoned
- 1999-04-14 DE DE69928517T patent/DE69928517T2/en not_active Expired - Fee Related
- 1999-04-14 WO PCT/GB1999/001132 patent/WO1999053513A1/en active IP Right Grant
- 1999-04-14 DE DE69934338T patent/DE69934338T2/en not_active Expired - Fee Related
- 1999-04-14 CN CNB998069116A patent/CN1134807C/en not_active Expired - Fee Related
- 1999-04-14 EP EP04028228A patent/EP1517346B1/en not_active Expired - Lifetime
-
2002
- 2002-01-15 HK HK02100305.8A patent/HK1038829A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE69928517D1 (en) | 2005-12-29 |
| GB0216281D0 (en) | 2002-08-21 |
| EP1072048B1 (en) | 2005-11-23 |
| WO1999053513A1 (en) | 1999-10-21 |
| EP1517346A1 (en) | 2005-03-23 |
| AU3435499A (en) | 1999-11-01 |
| GB9807924D0 (en) | 1998-06-10 |
| EP1072048A1 (en) | 2001-01-31 |
| DE69928517T2 (en) | 2006-08-10 |
| GB2338110A (en) | 1999-12-08 |
| EP1517346B1 (en) | 2006-12-06 |
| GB2373926B (en) | 2002-11-13 |
| CN1304539A (en) | 2001-07-18 |
| DE69934338T2 (en) | 2007-06-28 |
| GB2373926A (en) | 2002-10-02 |
| DE69934338D1 (en) | 2007-01-18 |
| HK1038829A1 (en) | 2002-03-28 |
| GB2338110B (en) | 2002-08-28 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
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| ASS | Succession or assignment of patent right |
Owner name: AOTAI THERMOSTAT (SHENZHEN) CO., LTD. Free format text: FORMER OWNER: OTTER CONTROLS LIMITED Effective date: 20110914 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; TO: 518108 SHENZHEN, GUANGDONG PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20110914 Address after: 518108, Shenzhen Baoan District Shiyan street Tong Tong Community Sanlian Industrial Zone, the same high company building 1 Patentee after: Ferro Techniek Holding B V Address before: Derby County Patentee before: Otter Controls Limited |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20040114 Termination date: 20120414 |