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CN104167329A - High-precision thermorelay - Google Patents

High-precision thermorelay Download PDF

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Publication number
CN104167329A
CN104167329A CN201310185943.1A CN201310185943A CN104167329A CN 104167329 A CN104167329 A CN 104167329A CN 201310185943 A CN201310185943 A CN 201310185943A CN 104167329 A CN104167329 A CN 104167329A
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China
Prior art keywords
pointer
lever
thermorelay
push rod
spacing
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Granted
Application number
CN201310185943.1A
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Chinese (zh)
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CN104167329B (en
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郭永明
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Individual
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Individual
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Publication of CN104167329B publication Critical patent/CN104167329B/en
Expired - Fee Related legal-status Critical Current
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Abstract

A high-precision thermorelay is formed by a metal moving plate, a pointer, a digital calibrated scale, a guide plate, a lever 1, a lever 2, a lever 3, a push rod, a switch, a current setting knob and a test key. The pointer is arranged on the lever 3, the length of the pointer being five times larger than that of the force arm of the lever 3; errors due to zero shift of the metal moving plate enables the lever 2 to rotate, the push rod to rotate and the pointer to rotate through the guide plate, and finally, the interval between the initial position of the lever and the final position (tripping position) of the push rod is allowed to change; interval change is amplified by 10 times by a pointer table formed by the pointer and the digital calibrated scale; an electrician can judge the interval error of the thermorelay according to the figures displayed on the pointer table, so that whether the thermorelay can protect a motor effectively can be judged; and the current setting knob can change the interval to correct the error, and the interval of the thermorelay is allowed to returned to a reasonable range, thereby guaranteeing protective features of the protective feature during using to meet standard completely, preventing the thermorelay having no protaction effect due to large errors to be used for a long time, and greatly reducing the burnout quantity of the motors.

Description

High accuracy thermal relay
Affiliated technical field
The present invention relates to a kind of thermal relay of protecting motor, the especially a kind of high accuracy thermal relay that can survey distance between push rod initial position and push rod final position (dropout position).
Background technology
At present, in industrial and agricultural production, thermal relay is the low-voltage electrical apparatus of the protection motor of output, use amount maximum, accounts for 90%, motor protector (containing computer-shape) less than 10%.The motor amount of burning out of annual thermal relay protection is over 100,000,000.But; the main cause that the motor of people's thermal relay protection burns out in a large number is not all understood: do not know that thermal relay exists " spacing " (distance between push rod initial position and push rod final position) both at home and abroad; do not know to survey the method for spacing, not knowing to use spacing to surpass when zone of reasonableness thermal relay protective feature just can not meet the motor overload of standard, thermal relay protection could burn out in a large number! In fact, spacing not only could directly be surveyed! And cannot see! But objective reality! To be related to that can thermal relay effectively protect the most important technological parameter of motor! Owing to not finding for a long time the method for surveying spacing, the reason that the motor of thermal relay protection burns out is in a large number unclear, and problem can not get solving for a long time! Wrong the saying of the reason that the motor of protecting about thermal relay in various magazines, in textbook, on eelctrical engineering handbook, on the net burns out in a large number be all! Just be stuck in spacing!
The motor of thermal relay protection burns out every year over 100,000,000: wherein 80% (8,000 ten thousand; lose 1,000 hundred million) be to use spacing to surpass zone of reasonableness (this patent is dealt with problems), use protective feature can not meet the thermal relay of standard, all the other account for 20% (insulating barrier is aging, thunderbolt, bimetal leaf are burnt etc.).Conventionally people's mistake think overload, stall, bearing fault, mechanical be the reason that the motor of thermal relay protection burns out in a large number when stuck? this is external cause in fact; use " spacing " at the thermal relay of zone of reasonableness, not to be only the main cause (internal cause) that causes the motor of thermal relay protection to burn out; " spacing " is at zone of reasonableness; protective feature meets standard; overload, stall, bearing fault, mechanical when stuck thermal relay can thread off, motor can not burn out or burn less! Internal cause plays a decisive role! Just as two points distinguish that narrow heart patient is often because of fatigue climbing, exciting etc. outer thereby dead! Internal cause is that two points distinguish narrow! Tired climbing, exciting etc. is external cause, and tired climbing, exciting etc. can not make people dead.As long as find calorimetric relay spacing method, make thermal relay spacing at zone of reasonableness, thermal relay protective feature just could meet standard for a long time, just can greatly reduce motor and burn out quantity! But because spacing changes very little (the 0.2mm order of magnitude), naked eyes could be differentiated, and must amplify 10 times of naked eyes and could differentiate, just with practical value!
Thermal relay uses a Jia after the time, due to alternately changing of high low temperature, alloy moving plate in bimetal leaf all will produce phase transformation, it is alloy microstructure, crystal arrangement changes, cause the line coefficient of dilatation of alloy moving plate to produce sharply variation, internal stress (the thermal stress of alloy moving plate, mechanical stress, residual stress) size, distribution changes, the variation of internal stress makes the modulus of elasticity of alloy moving plate, than physical quantitys such as bendings, change, alloy moving plate produces null offset, be that alloy moving plate can not return to initial condition, due to alloy moving plate, guide plate, lever sequentially connects, the null offset of alloy moving plate finally makes spacing between push rod initial position and push rod final position (dropout position) change, this is irresistible thermodynamic process! the null offset of alloy moving plate makes spacing change (become large).
Spacing function is not measured, shows, amplified to ordinary hot relay, electrician does not know that whether the spacing of thermal relay in use is at zone of reasonableness, whether protective feature meets standard, can only allow spacing not at zone of reasonableness, the thermal relay that protective feature can not meet standard uses for a long time, causes the motor of thermal relay protection to burn out in a large number; Digital type thermal relay (200910104701.9) has pointer gauge, feature is that pointer and push rod are in same lever, can survey spacing, but precision is low, ratio≤5 times of the pointer radius of gyration and the push rod radius of gyration in lever, it is low that spacing is exaggerated multiple, and reason is to be subject to empty, process technology limit in thermal relay, push rod rotates half warp can not be too little, and pointer length can not be oversize.
Summary of the invention
In order to overcome ordinary hot relay, do not measure and show and amplify spacing function, digital type thermal relay (200910104701.9) has pointer gauge, can survey spacing, but precision low (spacing is amplified 3-5 doubly).The invention provides a kind of high accuracy thermal relay; not only can survey spacing; also spacing can be amplified to 10 times; electrician can judge that by pointer gauge whether thermal relay spacing is at zone of reasonableness; judge whether thermal relay protection feature meets standard, and adjustable this spacing, round-off error; prevent that the thermal relay not shielding that error is large from using for a long time, reaches the object of effective protection motor.
The technical solution adopted for the present invention to solve the technical problems is:
The present invention increases a lever 3 in thermal relay, feature is that pointer and push rod are respectively in lever 3 levers 2, lever 3 fulcrums are fixed on vertical sidewall, the arm of force (stress point is to rotating shaft distance) is connected with guide plate, resistance arm is pointer, pointer upwards pierces into and is positioned at the slot that has digital calibration chi on the limit regulating on panel, pointer, digital calibration chi forms pointer gauge, between pointer length and the arm of force than being 5 times, any minor variations of guide plate is all amplified 5 times by pointer, guide plate is also controlled lever 2 simultaneously, lever 2 upper push-rod radiuss of turn and the ratio 1: 2 (being similar to) that is subject to the arm of force radius of turn of guide plate control, push rod displacement is guide plate displacement 1/2 (being similar to), when guide plate moves, pointer rotation on lever 2 upper push-rod rotations, lever 3, obvious pointer rotary distance is 10 times of push rod rotary distance, is 5 times, guide plate.Pointer gauge shows that numeral is to amplify 10 times of distance values, measures like this spacing, amplifies spacing.
Pointer gauge is the metrical instrument of surveying spacing, just available after school zero, demarcation.
School zero: stir test key, switch is threaded off, and pointer gauge is 0.
Demarcate: use qualified thermal relay, the pointer tabular value under survey 0.8,0.9,1.0Ie electric current, obtains electric current and spacing (pointer tabular value) table of comparisons.
It is for changing spacing that electric current regulates knob or electric current adjusting rod: the error of bringing due to the null offset of alloy moving plate rotates lever 2 rotations, push rod by guide plate, the error that the null offset of alloy moving plate brings finally makes spacing change, utilize electric current to regulate the eccentric wheel of knob can make lever 1 rotation, lever 2 rotations, make push rod position change, make spacing to change.Electric current tunes up, and it is large that spacing becomes, and vice versa, with it, revises the error of the null offset generation of alloy moving plate.
Electrician, by the table of comparisons (pointer gauge numeral contrast current value), could judge that whether high accuracy thermal relay spacing is at zone of reasonableness, and the error size of judgement high accuracy electrical equipment, judges whether high accuracy thermal relay protection feature meets standard! Can judgement high accuracy thermal relay effectively be protected motor? prevent that the high accuracy thermal relay that error very much not shields from using for a long time.The motor that high accuracy thermal relay is protected burns out quantity and greatly reduces.
Of the present invention and the following advantage of digital type thermal relay:
In digital type thermal relay, pointer and push rod, on same lever, could only amplify spacing 3-5 doubly, and pointer of the present invention and push rod in lever 3 levers 2, can amplify spacing 10-20 doubly respectively, and precision improves, and technological progress is obvious! Protection better effects if.
The following advantage of the present invention and thermal relay:
With pointer gauge, amplify and show distance values.
Embodiment:
Fig. 1 is the vertical view of first embodiment of the invention.
Fig. 2 is the A--A cutaway view of Fig. 1.
In figure:
1. metal moving plate, 2. guide plate, 3. test key, 4. lever 1, and 5. lever 2, and 6. lever 3,7. pointer, 8. push rod initial position, 9. push rod final position (dropout position), 10. push rod, 11. eccentric wheels, 12. spring leafs, 13. current calibration knobs, 14. switches, 15. digital calibration chis, 16. slots, 17. regulate panel, 18. lever 3 arm of forces
In Fig. 1: regulating panel (17) upper, have digital calibration chi (15), pointer (7), current calibration knob (13), slot (16), test key (3).By pointer (7), digital calibration chi (15), form pointer gauge (19), pointer 0 position is dropout position, pointer gauge numeral is the distance values after 12 expressions are amplified, and expression push rod initial position is (dropout position) required displacement to push rod final position.Pointer-digit is larger, represents that spacing is larger, and vice versa.
In Fig. 2: metal moving plate (1) heating, bending after energising, guide plate (2) is moved to the left, guide plate turns clockwise lever 2 (5) upper push-rods (10), the upper pointer (7) of lever 3 (6) is turned clockwise, between pointer length on lever 3 and the arm of force (18) than being 5 times, lever 2 upper push-rod radiuss of turn and the ratio 1: 2 (being similar to) that is subject to the arm of force radius of turn of guide plate control, pointer rotary distance is 10 times of push rod rotary distance, for 5 times, guide plate, pointer gauge (19) shows that numeral is to amplify 10 times of distance values.The null offset of metal moving plate, is equivalent to metal moving plate (1) and moves right, and guide plate (2) is moved right, and lever 2 (5) upper push-rods (10) are rotated counterclockwise, and makes spacing become large, and null offset stack error can make spacing surpass zone of reasonableness.
Regulate the eccentric wheel (11) on current calibration knob (13) can make lever 1 (4) be rotated counterclockwise, make the push rod on the lever 2 (5) on lever 1 be rotated counterclockwise (moving right), spacing is reduced, vice versa.With current calibration knob, can change spacing, can revise spacing stack error, make spacing return zone of reasonableness, make the protective feature of thermal relay meet standard, protected motor can not burn out mutually because transshipping to break.
Pointer (7) is made of fine wire.
Above-mentioned improvement does not affect former thermal relay mechanical transmission course, can not increase resistance, simple.

Claims (2)

1. a high accuracy thermal relay, by metal moving plate, pointer, digital calibration chi, guide plate, lever 1, lever 2, lever 3, push rod, switch, current calibration knob, test key, formed, it is characterized in that: at the upper pointer (7) of installing of lever 3 (6), pointer (7) upwards pierces into the slot (16) in adjusting range (17), slot side is provided with digital calibration chi (15), pointer and digital calibration chi form pointer gauge, and pointer length is greater than the arm of force (18) length being connected with guide plate.
2. a high accuracy thermal relay as claimed in claim 1, is characterized in that lever 3 fulcrums are fixed on housing.
CN201310185943.1A 2013-05-17 2013-05-17 High-precision electrothermal relay Expired - Fee Related CN104167329B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310185943.1A CN104167329B (en) 2013-05-17 2013-05-17 High-precision electrothermal relay

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310185943.1A CN104167329B (en) 2013-05-17 2013-05-17 High-precision electrothermal relay

Publications (2)

Publication Number Publication Date
CN104167329A true CN104167329A (en) 2014-11-26
CN104167329B CN104167329B (en) 2018-12-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310185943.1A Expired - Fee Related CN104167329B (en) 2013-05-17 2013-05-17 High-precision electrothermal relay

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0467525A (en) * 1990-07-09 1992-03-03 Fuji Electric Co Ltd Thermal overload relay
US5109210A (en) * 1990-04-06 1992-04-28 Telemecanique Thermal relay with remote controlled resetting and testing junctions
CN1173728A (en) * 1996-05-22 1998-02-18 富士电机株式会社 Reversing spring contact switching mechanism and thermal overload relay
CN2279694Y (en) * 1996-10-17 1998-04-22 陈英钟 Double-metal plate thermal relay
CN101510487A (en) * 2008-02-13 2009-08-19 富士电机机器制御株式会社 Thermally operated overload relay
CN102054629A (en) * 2009-11-10 2011-05-11 郭永明 Digital thermorelay
CN102298865A (en) * 2010-06-23 2011-12-28 上海市嘉定区第二中学 Metal thermal expansion and tiny deformation magnify demonstration instrument

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5109210A (en) * 1990-04-06 1992-04-28 Telemecanique Thermal relay with remote controlled resetting and testing junctions
JPH0467525A (en) * 1990-07-09 1992-03-03 Fuji Electric Co Ltd Thermal overload relay
CN1173728A (en) * 1996-05-22 1998-02-18 富士电机株式会社 Reversing spring contact switching mechanism and thermal overload relay
CN2279694Y (en) * 1996-10-17 1998-04-22 陈英钟 Double-metal plate thermal relay
CN101510487A (en) * 2008-02-13 2009-08-19 富士电机机器制御株式会社 Thermally operated overload relay
CN102054629A (en) * 2009-11-10 2011-05-11 郭永明 Digital thermorelay
CN102298865A (en) * 2010-06-23 2011-12-28 上海市嘉定区第二中学 Metal thermal expansion and tiny deformation magnify demonstration instrument

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