CN111048362B - Thermal release adjusting device of molded case circuit breaker - Google Patents
Thermal release adjusting device of molded case circuit breaker Download PDFInfo
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- CN111048362B CN111048362B CN201911384894.8A CN201911384894A CN111048362B CN 111048362 B CN111048362 B CN 111048362B CN 201911384894 A CN201911384894 A CN 201911384894A CN 111048362 B CN111048362 B CN 111048362B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/02—Housings; Casings; Bases; Mountings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/40—Combined electrothermal and electromagnetic mechanisms
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a thermal release regulating device of a molded case circuit breaker, which comprises a mounting assembly, a release stroke tester and a thermal release regulating assembly, wherein the mounting assembly comprises a mounting plate, a fixing screw and a positioning piece; the fixing screw passes first installation draw-in groove will the setting element installation is fixed on the mounting panel, the setting element will thermal release adjusting device installs the location on the circuit breaker that needs the detection, the dropout stroke tester passes through the mounting screw and is in the second installation draw-in groove department of mounting panel, thermal release regulation benchmark board passes through the mounting hole site department of hand screw fixation at the mounting panel with the benchmark board spring. The thermal release adjusting device of the molded case circuit breaker has rich functions and simple structure, and is convenient to disassemble, maintain and repair; the circuit breaker production and verification can be simplified, and the circuit breaker production and verification can be quantized.
Description
Technical Field
The invention relates to the field of detection tools, in particular to a thermal release adjusting device of a molded case circuit breaker.
Background
The molded case circuit breaker is generally applied to power distribution equipment such as factories and buildings, and can be used for frequent line switching and infrequent starting of a motor under normal conditions, and meanwhile, overload, short circuit and undervoltage protection can be provided. And a series of functions such as remote brake opening, alarming, auxiliary contact output and the like can be realized by matching with abundant internal accessories.
The performance of the molded case circuit breaker is related to many factors, such as over travel, opening distance, final pressure, tripping force, etc., and general manufacturers can detect the above parameters, but often neglect the detection of the tripping travel of the circuit breaker.
The tripping stroke of the circuit breaker refers to the stroke required by opening the circuit breaker after the draw bar acts in the closing state of the circuit breaker, and indirectly reflects the size of the re-tripping amount of the circuit breaker. The re-buckling amount of the circuit breaker has great influence on the performance of the circuit breaker, and if the re-buckling amount is too small, the circuit breaker can be buckled in a sliding manner; and the circuit breaker can not be opened due to too large detaining amount. Meanwhile, the tripping force of the circuit breaker is related to the re-tripping amount, the circuit breaker with smaller re-tripping amount is usually smaller in tripping force, and the circuit breaker with larger re-tripping amount is likely to have correspondingly larger tripping force, so that in production, if one parameter is not determined, which party causes the problem is difficult to accurately judge, and the corresponding technical problem cannot be fundamentally solved.
An effective re-buckling amount is determined in the design stage of the circuit breaker, but due to differences of parts and assembly process levels, the same batch of products are often caused, and the re-buckling amount has large differences.
The re-buckling amount of the circuit breaker is different, so that the phenomena of sliding buckling, locking and the like of the circuit breaker can be caused, and the production efficiency of products can be influenced, for example, the same batch of products have no unified operation standard when the thermal/magnetic release is adjusted due to different re-buckling amounts, continuous trial needs to be carried out, and the production efficiency is low; when the circuit breaker leaves a factory in the later period, the circuit breaker is additionally provided with internal accessories (particularly shunt excitation/undervoltage), and the accessories need to be adjusted to be used due to different re-buckling amounts of the circuit breaker; if the customer needs to install the internal accessories by oneself, the customer can not correctly adjust the relevant accessories because the circuit breaker is buckled differently, and in severe cases, the accessories are disabled, so that hidden dangers exist in production equipment and user safety.
In production, the amount of detaining again of circuit breaker is decided by detaining again with parts such as hasp, but the amount of detaining again itself numerical value is little, and the assembly back, and the space is compact between the spare part, uses the physical chi to be difficult to carry out accurate measurement, so need to develop the device of using and control the amount of tripping of circuit breaker (indirect control circuit breaker amount of detaining again), makes it in a reasonable range.
Disclosure of Invention
The invention mainly solves the technical problem of providing the thermal release regulating device of the molded case circuit breaker, which has the advantages of simple operation, convenient installation and good universality and can be widely applied to the production of the molded case circuit breakers with different shell frames.
In order to solve the technical problems, the invention adopts a technical scheme that: the thermal release adjusting device of the molded case circuit breaker comprises an installation assembly, a release stroke tester and a thermal release adjusting assembly, wherein the installation assembly comprises an installation plate, a fixing screw and a positioning piece;
be equipped with first installation slot, second installation slot and installation hole site on the mounting panel, set screw passes first installation slot will the setting element installation is fixed on the mounting panel, the setting element will thermal release adjusting device installation location is on the circuit breaker that needs the detection, the dropout stroke tester passes through the mounting screw and is in the second installation slot department of mounting panel, thermal release regulation benchmark board passes through the installation hole site department of hand screw fixation at the mounting panel with the benchmark board spring.
In a preferred embodiment of the invention, the thermal release adjusting reference plate is provided with a folded edge at the mounting position of the hand screw, and the folded edge is provided with a positioning reference scale along the adjusting direction of the hand screw.
In a preferred embodiment of the present invention, the thermal trip unit adjusting reference plate is provided with a trip stroke tester abdicating groove.
In a preferred embodiment of the present invention, the trip stroke tester of the molded case circuit breaker includes: the locking device comprises a sealing plate, a main spring, a tripping rod, a shell, a positioning sleeve and a tripping button mechanism;
the rear end of the shell is opened, a sliding groove is formed in the right side plate of the shell, and a mounting hole is formed in the top plate of the shell;
the sealing plate is provided with a through hole and is arranged at the opening at the rear end of the shell;
the trip bar comprises a main body of the trip bar, a front end rod piece positioned at the front end of the main body of the trip bar and a rear end rod piece positioned at the rear end of the main body of the trip bar; a travel groove is formed in the main body of the trip rod and comprises a suction hole in the front end and a release groove in the rear end, and the diameter of the suction hole is larger than the width of the release groove; the top end of the front end rod piece is in a step shape and comprises a convex part and a concave part; the trip bar is installed in a cavity of the shell, the rear end bar piece penetrates through a through hole in the sealing plate and extends out of the shell, and the front end bar piece penetrates through a sliding groove in a left side plate of the shell and is positioned outside the shell;
the main spring is sleeved on the rear end rod piece, one end of the main spring is in contact with the inner surface of the sealing plate, and the other end of the main spring is in contact with the side surface of the main body of the trip rod;
the trip button mechanism comprises a mounting pipe of the trip button, the trip button and a spring of the trip button, the mounting pipe penetrates through the mounting hole and is fixed on the shell, the trip button is mounted in the mounting pipe, the spring is positioned between the trip button and the mounting pipe, the lower end of the trip button is positioned in the cavity of the shell and penetrates through the stroke slot, and the upper end of the trip button is positioned outside the shell;
the positioning sleeve is arranged at the lower end of the tripping button;
when the tripping stroke tester is in an attraction state, the tripping button mechanism is positioned in the attraction hole and is fixed in the attraction hole through the positioning sleeve, and the main spring is in a compressed state; and downwards pressing the tripping button mechanism to enable the positioning sleeve to be downwards separated from the suction hole, driving the tripping rod to move forwards under the action of the compression force of the main spring, and enabling the tripping button mechanism to be located in the release groove and the tripping stroke tester to be in a release state.
In a preferred embodiment of the present invention, the trip button mechanism includes a mounting tube of the trip button, and a spring of the trip button, the inner wall of the mounting tube of the trip button is in a step shape with a lower end protruding, the trip button is in a rod shape and includes a head and a rod, the head protrudes beyond the rod, the spring of the trip button is sleeved on the rod of the trip button, the mounting tube of the trip button is further sleeved outside the trip button, one end of the spring of the trip button contacts with a protruding bottom surface of the head, the other end contacts with a protruding plane of the inner wall of the mounting tube of the trip button, and when the trip stroke tester is in a release state, the spring of the trip button is in a tension state.
In a preferred embodiment of the present invention, the positioning sleeve includes an upper portion and a lower portion, the diameter of the lower portion is larger than the diameter of the upper portion, the diameter of the upper portion is smaller than the diameter of the suction hole and larger than the width of the release groove, the diameter of the lower portion is larger than the diameter of the suction hole, and the diameter of the rod portion of the trip button is smaller than the width of the release groove.
In a preferred embodiment of the present invention, the lower end of the trip button is connected with the positioning sleeve by a screw thread.
In a preferred embodiment of the present invention, the mounting tube of the trip button is fixed to the housing by welding.
In a preferred embodiment of the present invention, in the pull-in state, the final compression of the main spring is comparable to the breaker tripping force.
In a preferred embodiment of the present invention, the rear end of the rear rod of the trip bar has a circular hole.
In a preferred embodiment of the present invention, the front rod of the trip bar is a split structure, and includes a front rod connecting portion and a cap, the cap is fitted on the front end of the connecting portion, and the top end of the cap is stepped and includes a convex portion and a concave portion.
In a preferred embodiment of the present invention, the sealing plate and the housing are fixed by means of a mortise and tenon structure.
In a preferred embodiment of the present invention, the housing has protruding connection structures on the left and right sides thereof.
The invention has the beneficial effects that: the thermal release regulating device of the molded case circuit breaker has the following advantages:
1. the multifunctional electric water heater has the advantages of rich functions, simple structure, low manufacturing cost and convenient disassembly, maintenance and repair.
2. The circuit breaker production and calibration can be simplified, the circuit breaker production and calibration can be quantized, the worker experience is not completely relied on, the production efficiency is improved, the product quality management is facilitated, the installation and the debugging work of accessories in the circuit breaker in the later period are facilitated, and the reliability and the safety of the accessories are improved.
3. The circuit breaker fault analysis device is used together with other detection tools, timeliness and accuracy of circuit breaker fault analysis can be improved, the problem of faults is solved fundamentally, and improvement of product quality is facilitated.
Drawings
Fig. 1 is a schematic view of an installation structure of a thermal trip adjusting apparatus of a molded case circuit breaker according to the present invention;
fig. 2 is a schematic perspective view of a thermal trip adjusting apparatus of a molded case circuit breaker according to a preferred embodiment of the present invention;
fig. 3 is an exploded view of a thermal trip regulating apparatus of the molded case circuit breaker of fig. 2;
FIG. 4 is a schematic structural view of the mounting plate shown in FIG. 1;
fig. 5 is a schematic front view of a thermal trip regulating base board shown in fig. 1;
FIG. 6 is a side view schematic of FIG. 5;
fig. 7 is a schematic structural view of the thermal trip adjusting apparatus for a molded case circuit breaker according to the present invention when debugging the molded case circuit breaker;
fig. 8 is a schematic view of the installation positions of the respective parts when the thermal trip adjusting apparatus of the molded case circuit breaker of the present invention performs the debugging work of the molded case circuit breaker;
fig. 9 is a schematic diagram of a trip test performed by the trip travel tester;
FIG. 10 is a schematic diagram of a trip travel tester performing a trip free test;
FIG. 11 is a schematic diagram of the positions of the components of the trip stroke tester during the no-trip test;
fig. 12 is a schematic perspective view of a trip stroke tester of the molded case circuit breaker according to a preferred embodiment;
fig. 13 is an exploded schematic view of a trip stroke tester of the molded case circuit breaker of fig. 12;
FIG. 14 is a schematic structural view of the trip bar shown in FIG. 12;
FIG. 15 is a schematic structural view of the alignment sleeve shown in FIG. 12;
fig. 16 is a schematic cross-sectional elevational view of the pull-in condition of the trip travel tester shown in fig. 12;
fig. 17 is a schematic cross-sectional top view of the pull-in condition of the trip travel tester shown in fig. 16;
fig. 18 is a schematic cross-sectional elevational view of the trip travel tester release state of fig. 12;
fig. 19 is a cross-sectional top view of the trip travel tester of fig. 18 in a released state;
FIG. 20 is a schematic structural view of another preferred embodiment of a trip bar;
the parts in the drawings are numbered as follows: a-a circuit breaker, b-a thermal release adjusting device, 1-a mounting component, 11-a mounting plate, 111-a first mounting slot, 112-a second mounting slot, 12-a fixing screw, 13-a positioning piece, 2-a release stroke tester, 21-a sealing plate, 22-a main spring, 23-a release rod, 231-a rear rod body of the release rod, 2311-a round hole, 232-a main body of the release rod, 2321-a stroke slot, 232-a front rod body of the release rod, 2331-a bulge, 2332-a recess, 2333-a cap, 24-a shell, 25-a positioning sleeve, 26-a release button mechanism, 261-a release button, 262-a spring of the release button, 263-a mounting pipe of the release button, and 3-a thermal release adjusting component, 31-thermal release regulating reference plate, 311-abdicating groove, 32-reference plate spring and 33-hand screw.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
Referring to fig. 1 to 5, an embodiment of the present invention includes:
the thermal release adjusting device of the molded case circuit breaker comprises an installation assembly 1, a trip stroke tester 2 and a thermal release adjusting assembly 3, wherein the installation assembly 1 comprises an installation plate 11, a fixing screw 12 and a positioning piece 13, the trip stroke tester 2 and the thermal release adjusting assembly 3 are installed on the installation plate 11, the fixing screw 12 is used for installing the positioning piece 13 on the installation plate 11, and finally the positioning piece 13 is used for installing and positioning the thermal release adjusting device on a circuit breaker needing to be detected.
Thermal release adjustment assembly 3 includes that thermal release adjusts benchmark board 31, benchmark board spring 32 and hand screw 33, be equipped with first installation draw-in groove 111, second installation draw-in groove 112 and installation hole site on the mounting panel 11, set screw 12 passes first installation draw-in groove 111 will setting element 13 installation is fixed on the mounting panel 11, this embodiment diagram setting element 13 has two, and is corresponding first installation draw-in groove 111 also has two, setting element 13 can remove in first installation draw-in groove 111, passes through as required set screw 12 is fixed in corresponding position to the circuit breaker of adaptation in different shelfs. The trip stroke tester 2 is mounted at the second mounting slot 112 of the mounting plate 11 by screws, the trip stroke tester 2 can move in the second mounting slot 112, and by moving the position of the trip stroke tester 2, a trip test or a no-trip test can be selected. The thermal release adjusting reference plate 31 and the reference plate spring 32 are fixed at the mounting hole position of the mounting plate 11 through a hand screw 33, and the position of the reference plate 31 is adjusted through the hand screw 33 to adapt to different circuit breakers. In order to make the adjustment more accurate, the thermal release adjusting reference plate 31 is provided with a folded edge at the mounting position of the hand screw 33, and the folded edge is provided with a positioning reference scale along the adjusting direction of the hand screw 33. The thermal trip adjusting reference plate 31 is further provided with a trip stroke tester 2 abdicating groove 311.
As shown in fig. 12 to 20, the trip stroke tester of the molded case circuit breaker includes: closing plate 21, main spring 22, trip bar 23, housing 24, positioning sleeve 25, and trip button mechanism 26, said trip button mechanism 26 comprising trip button 261, trip button spring 262, and trip button mounting tube 263.
The rear end of the shell 24 is open, the right side plate of the shell 24 is provided with a sliding groove, and the top plate of the shell 24 is provided with a mounting hole. In order to facilitate the installation and fixation of the trip stroke tester at a desired position, the left and right sides of the housing 24 are respectively provided with a protruding connection structure, which may be a protruding ear-shaped structure in the figure, and the connection structure is provided with a fixing hole for a connecting member such as a bolt to pass through and be fixed on a corresponding component.
The sealing plate 21 is provided with a through hole, and the sealing plate 21 is installed at the rear end opening of the shell 24. Preferably, the closing plate 21 and the housing are fixed by means of a mortise and tenon structure.
The trip bar 23 shown in connection with fig. 3 includes a main body 232 of the trip bar 23, a front end rod 231 located at a front end of the main body 232 of the trip bar 23, and a rear end rod 233 located at a rear end of the main body 232 of the trip bar 23; a round hole 2311 is formed in the tail end of the rear end rod piece 233 of the trip bar 23, a stroke groove 2321 is formed in the main body 232 of the trip bar 23, the stroke groove 2321 comprises a front end suction hole and a rear end release groove, and the diameter of the suction hole is larger than the width of the release groove; the top end of the front rod 231 is stepped and includes a convex portion 2331 and a concave portion 2332. As shown in fig. 9, the front rod 231 of the trip bar 23 is a split structure, and includes a front rod 231 connecting portion and a cap, the cap is sleeved on the front end of the connecting portion, and the top end of the cap is stepped and includes a protruding portion 2331 and a recessed portion 2332. The split structure can ensure that the tripping formation tester can be adapted to different shell frame circuit breakers by only replacing sleeve caps with different sizes.
The trip bar 23 is installed in the cavity of the housing 24, the rear end rod 233 passes through the through hole of the closing plate 21 and extends to the outside of the housing 24, and the front end rod 231 passes through the sliding groove on the left side plate of the housing 24 and is located outside the housing 24. The trip bar 23 can slide back and forth in the slide slot.
The main spring 22 is fitted around the rear rod 233, and has one end contacting the inner surface of the closing plate 21 and the other end contacting the side surface of the main body 232 of the trip lever 23.
The trip button mechanism 26 is cylindrical, the lower end of the trip button mechanism passes through the mounting hole and the stroke slot 2321 and is located in the cavity of the housing 24, and the upper end of the trip button mechanism is located outside the housing 24. Specifically, the trip button mechanism 26 includes a trip button mounting tube 263, a trip button 261 and a trip button spring 262, the inner wall of the mounting tube 263 of the trip button is in a step shape with a convex lower end, the trip button 261 is in a rod shape and comprises a head part and a rod part, the head part is protruded than the rod part, the spring 262 of the trip button is sleeved on the rod part of the trip button 261, the mounting tube 263 of the trip button is sleeved outside the trip button 261, one end of the spring 262 of the trip button is contacted with the convex bottom surface of the head, the other end is contacted with the convex plane of the inner wall of the mounting tube 263 of the trip button, the mounting tube 263 of the trip button is fixed on the housing, the lower end of the trip button is connected with the positioning sleeve 25, when the trip travel tester is in the release state, the spring 262 of the trip button is in the tension state. Preferably, the lower end of the trip button 261 is threadedly coupled to the positioning sleeve 25. The mounting tube 263 of the trip button is fixed to the housing 24 by welding.
The positioning sleeve 25 is mounted on the lower end of the trip button mechanism 26, i.e., the lower end of the shaft of the trip button 261. As shown in fig. 4, the positioning sleeve 25 includes an upper portion and a lower portion, the diameter of the lower portion is larger than that of the upper portion, the diameter of the upper portion is smaller than that of the suction hole and larger than the width of the release groove, the diameter of the lower portion is larger than that of the suction hole, and the diameter of the rod portion of the trip button 261 is smaller than that of the release groove. Such a mechanism is provided that the upper portion of the positioning sleeve 25 can enter the engaging hole, and the lower portion of the positioning sleeve 25 does not pass through the engaging hole and further does not enter the releasing groove, thereby fixing the positioning sleeve 25 in the engaging hole. While the stem of the trip button 261 can slide throughout the travel slot 2321.
As shown in fig. 5 and 6, the pull-in state of the trip stroke tester is shown, when the trip stroke tester is in the pull-in state, the trip button mechanism 26 is located in the pull-in hole and fixed in the pull-in hole through the positioning sleeve 25, the main spring 22 is in the compressed state, and in the pull-in state, after the main spring is finally compressed, the force is equivalent to the trip force of the circuit breaker. The pull-in state working process of the tripping stroke tester comprises the following steps: the tripping rod 23 is pulled to enable the main spring 22 to be in a compressed state, the compression force of the main spring 22 is equal to the tripping force of the circuit breaker (less than or equal to 3N), at the moment, the positioning sleeve 25 fixed with the tripping button 261 is lifted upwards under the action force of the tripping spring and enters a great circle of the stroke slot 2321 to clamp the tripping rod 23, and the tripping stroke tester is enabled to be in a suction state.
As shown in fig. 7 and 8, in the release state of the trip stroke tester, when the trip stroke tester is in the release state, the main spring 22 is restored to the free state, and the rod of the trip button 261 is located in the release groove. The release state working process of the tripping stroke tester comprises the following steps: the tripping button mechanism 26 is pressed downwards, so that the positioning sleeve 25 fixed on the tripping button mechanism is separated from the suction hole downwards, at this time, the tripping rod 23 is out of restraint, moves forwards along the stroke slot 2321 under the action of the compressed main spring 22, finally, the main spring 22 returns to a free state, the two tripping button mechanisms 26 are located in the release slot, and the tripping stroke tester is in a release state.
The invention relates to a thermal release regulating device of a molded case circuit breaker, which comprises the following specific use steps:
1) taking out the assembled thermal release adjusting device of the molded case circuit breaker, adjusting the positions of the corresponding positioning piece and the thermal release adjusting reference plate according to different circuit breakers, and selecting a corresponding trip rod sleeve cap;
2) installing a thermal release adjusting device of a molded case circuit breaker on the circuit breaker, specifically, installing a positioning piece in an installation hole of a circuit breaker outlet end, and enabling the bottom of an installation plate to be in flush contact with the upper plane of a circuit breaker base;
3) pushing the tripping stroke tester to a tripping test position, and pulling the rear end of the tripping rod to suck the tripping stroke tester;
4) closing the breaker, and adjusting a traction rod adjusting screw to enable the traction rod to vertically contact with the protruding part of the trip rod;
5) the tripping button of the tripping stroke tester is pressed, the tripping stroke tester is released, the draw bar is pushed, the circuit breaker is reliably switched off, if the circuit breaker is not switched off,
6) pushing the tripping stroke tester to a non-tripping test position, and attracting the tripping stroke tester according to the method in the step 3);
7) closing the breaker, releasing the tripping stroke tester according to the method in the step 5), wherein the breaker is still at the closing position, and if the breaker is opened, comprehensively analyzing the fault reason of the breaker by matching with the tripping force tester, and repairing the breaker;
8) installing an adjusting screw of the thermal release, wherein the extension of the adjusting screw is based on the contact with an adjusting reference plate of the thermal release;
9) after the parameters of the circuit breaker are measured and recorded, the circuit breaker is sent to a verification room for characteristic verification; the parameters comprise overtravel, opening distance, final pressure, tripping force and the like;
10) in the checking process, the draw bar screw and the thermal release adjusting screw do not need to be adjusted again, checking can be directly carried out, the checking is qualified, and the adjusting screw is screwed and painted; and (5) after the product is unqualified, carrying out fine adjustment and then verifying again until the product is qualified.
The main functions of the invention include plastic shell breaker debugging, tripping test, non-tripping test and breaker failure reason analysis, and the specific working principle is as follows:
as shown in fig. 7 and 8, when the molded case circuit breaker is debugged, the circuit breaker a is in a closed state; the tripping stroke tester 2 is in a suction state and is positioned at the right side of a mounting clamping groove 112 of the tripping stroke tester 2 of the mounting plate, and at the moment, the traction rod a1 is vertically contacted with a front end convex part 2331 of a tripping rod 23 of the tripping stroke tester 2 by adjusting a traction rod adjusting screw a 2; the thermal trip adjusting reference plate 31 is adjusted to a corresponding position according to the tested circuit breaker, and a thermal trip adjusting screw a3 is installed such that its front portion contacts the thermal trip adjusting reference plate 31.
As shown in fig. 14, 16 and 17, the operating principle of the pull-in state of the trip stroke tester 2 is as follows: the tripping rod 23 is pulled to enable the main spring 22 to be in a compressed state, the compression force of the main spring 22 is equal to the tripping force of the circuit breaker (less than or equal to 3N), and at the moment, the positioning sleeve fixed with the tripping button is lifted upwards under the action force of the tripping spring and enters the big circle of the stroke groove 2321 to clamp the tripping rod 23, so that the tripping stroke tester 2 is in a suction state.
As shown in fig. 14, 18 and 19, the release state of the trip stroke tester 2 operates according to the following principle: when the tripping button is pressed, the positioning sleeve fixed with the tripping button moves downwards to be separated from the large circle of the stroke groove 2321, at the moment, the tripping rod 23 loses restraint, moves forwards along the stroke groove 2321 under the action of the main spring 22 in a compressed state, and the front part of the tripping rod 23 pushes against the traction rod a1 to drive the circuit breaker to act.
As shown in fig. 8, 9, 18 and 19, when the trip test is performed, the circuit breaker a is in a closed state, the trip stroke tester 2 is in an attraction state and is located on the right side of the installation slot of the trip stroke tester 2 of the installation plate, when the trip button is pressed, the trip stroke tester 2 performs a release action, at this time, the front end protrusion 2331 of the trip rod 23 pushes the traction rod a1 to act, the trip rod 23 has a stroke equivalent to the trip stroke of the circuit breaker, and at this time, the circuit breaker is opened.
As shown in fig. 10, 11, 18 and 19, when the no-trip test is performed, the circuit breaker a is in a closed state, the trip stroke tester 2 is in a suction state and is located on the left side of the installation slot of the trip stroke tester 2 of the installation plate, when the trip button is pressed, the trip stroke tester 22 performs a release action, at this time, the front end concave part of the trip rod 23 pushes the traction rod a1 to act, the stroke of the trip rod 23 is still equivalent to the trip stroke of the circuit breaker, and when the front end concave part of the trip rod 23 is shortened, the rotation angle of the traction rod a1 is reduced, and the circuit breaker is not enough to be opened, and the circuit breaker is still in a closed state.
In a tripping test/non-tripping test, the circuit breaker is judged to be a qualified product only by ensuring effective tripping of the tripping test and keeping closing in the non-tripping test, and then the circuit breaker can enter the next detection; and if not, the circuit breaker needs to be trimmed.
Analyzing the fault cause of the circuit breaker: the reason that the brake cannot be opened during the tripping test is mainly two: the tripping stroke is greatly changed/the tripping force is overlarge due to the mechanism deformation, and the reason of the problem can be accurately judged by combining a tripping force tester; when the test is not released, the reason of opening the brake is mainly two-sided: the small tripping stroke caused by the mechanism deformation and the small re-tripping amount caused by the over-small tripping force can be combined with a tripping force tester to judge the problem.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. The adjusting device of the thermal release of the molded case circuit breaker is characterized by comprising a mounting assembly, a release stroke tester and a thermal release adjusting assembly, wherein the mounting assembly comprises a mounting plate, a fixing screw and a positioning piece;
the thermal release device comprises a mounting plate, a thermal release adjusting device, a thermal release stroke tester and a thermal release stroke tester, wherein the mounting plate is provided with a first mounting clamping groove, a second mounting clamping groove and a mounting hole site;
the tripping stroke tester of the molded case circuit breaker comprises: the locking device comprises a sealing plate, a main spring, a tripping rod, a shell, a positioning sleeve and a tripping button mechanism;
the rear end of the shell is opened, a sliding groove is formed in the right side plate of the shell, and a mounting hole is formed in the top plate of the shell;
the sealing plate is provided with a through hole and is arranged at the opening at the rear end of the shell;
the trip bar comprises a main body of the trip bar, a front end rod piece positioned at the front end of the main body of the trip bar and a rear end rod piece positioned at the rear end of the main body of the trip bar; a travel groove is formed in the main body of the trip rod and comprises a suction hole in the front end and a release groove in the rear end, and the diameter of the suction hole is larger than the width of the release groove; the top end of the front end rod piece is in a step shape and comprises a convex part and a concave part; the trip bar is installed in a cavity of the shell, the rear end bar piece penetrates through a through hole in the sealing plate and extends out of the shell, and the front end bar piece penetrates through a sliding groove in a left side plate of the shell and is positioned outside the shell;
the main spring is sleeved on the rear end rod piece, one end of the main spring is in contact with the inner surface of the sealing plate, and the other end of the main spring is in contact with the side surface of the main body of the trip rod;
the trip button mechanism comprises a mounting pipe of the trip button, the trip button and a spring of the trip button, the mounting pipe penetrates through the mounting hole and is fixed on the shell, the trip button is mounted in the mounting pipe, the spring is positioned between the trip button and the mounting pipe, the lower end of the trip button is positioned in the cavity of the shell and penetrates through the stroke slot, and the upper end of the trip button is positioned outside the shell;
the positioning sleeve is arranged at the lower end of the tripping button;
when the tripping stroke tester is in an attraction state, the tripping button mechanism is positioned in the attraction hole and is fixed in the attraction hole through the positioning sleeve, and the main spring is in a compressed state; and downwards pressing the tripping button mechanism to enable the positioning sleeve to be downwards separated from the suction hole, driving the tripping rod to move forwards under the action of the compression force of the main spring, and enabling the tripping button mechanism to be located in the release groove and the tripping stroke tester to be in a release state.
2. The thermal release adjusting apparatus of a molded case circuit breaker according to claim 1, wherein the thermal release adjusting reference plate is provided with a flange at the mounting position of the thumb screw, and the flange is provided with a positioning reference scale along the adjustment direction of the thumb screw.
3. The thermal trip adjusting apparatus of the molded case circuit breaker according to claim 1, wherein the thermal trip adjusting reference plate is formed with a trip stroke tester relief groove.
4. The thermal trip adjusting apparatus of a molded case circuit breaker according to claim 1, wherein an inner wall of the mounting tube of the trip button is stepped with a lower end protruding, the trip button is rod-shaped and includes a head portion and a rod portion, the head portion protrudes beyond the rod portion, the spring of the trip button is sleeved on the rod portion of the trip button, the mounting tube of the trip button is further sleeved outside the trip button, one end of the spring of the trip button contacts with a protruding bottom surface of the head portion, the other end contacts with a protruding plane of the inner wall of the mounting tube of the trip button, and when the trip stroke tester is in a release state, the spring of the trip button is in a tension state.
5. The thermal trip unit adjusting apparatus of a molded case circuit breaker according to claim 4, wherein the positioning sleeve includes an upper portion and a lower portion, a diameter of the lower portion is larger than a diameter of the upper portion, a diameter of the upper portion is smaller than a diameter of the suction hole and larger than a width of the release groove, a diameter of the lower portion is larger than a diameter of the suction hole, and a diameter of the rod portion of the trip button is smaller than a width of the release groove.
6. The thermal trip unit adjusting apparatus of a molded case circuit breaker according to claim 4, wherein a lower end of the trip button is threadedly coupled to the positioning sleeve.
7. The thermal trip unit adjusting apparatus of a molded case circuit breaker according to claim 4, wherein the mounting tube of the trip button is fixed to the case by welding.
8. The thermal trip unit adjusting apparatus of a molded case circuit breaker according to claim 1, wherein in the attraction state, a force after the main spring is finally compressed is equivalent to a breaker trip force.
9. The thermal trip adjusting apparatus of a molded case circuit breaker according to claim 1, wherein the front end lever of the trip bar is a split structure including a front end lever connecting portion and a cap fitted over a front end of the connecting portion, and a top end of the cap is stepped and includes a convex portion and a concave portion.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911384894.8A CN111048362B (en) | 2019-12-28 | 2019-12-28 | Thermal release adjusting device of molded case circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911384894.8A CN111048362B (en) | 2019-12-28 | 2019-12-28 | Thermal release adjusting device of molded case circuit breaker |
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| CN111048362A CN111048362A (en) | 2020-04-21 |
| CN111048362B true CN111048362B (en) | 2021-11-26 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040070544A (en) * | 2003-02-04 | 2004-08-11 | 엘지산전 주식회사 | Trip device of circuit braker |
| CN201063323Y (en) * | 2007-05-18 | 2008-05-21 | 苏州中菱电器制造有限公司 | Improvement of thermal power trip structure for pyromagnetic adjustable breaker |
| CN207834232U (en) * | 2018-01-18 | 2018-09-07 | 常熟开关制造有限公司(原常熟开关厂） | A kind of thermal trip adjusting apparatus of breaker of plastic casing |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3007573B1 (en) * | 2013-06-20 | 2015-07-17 | Schneider Electric Ind Sas | TRIGGER AND METHOD FOR MANUFACTURING SUCH TRIGGER |
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2019
- 2019-12-28 CN CN201911384894.8A patent/CN111048362B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040070544A (en) * | 2003-02-04 | 2004-08-11 | 엘지산전 주식회사 | Trip device of circuit braker |
| CN201063323Y (en) * | 2007-05-18 | 2008-05-21 | 苏州中菱电器制造有限公司 | Improvement of thermal power trip structure for pyromagnetic adjustable breaker |
| CN207834232U (en) * | 2018-01-18 | 2018-09-07 | 常熟开关制造有限公司(原常熟开关厂） | A kind of thermal trip adjusting apparatus of breaker of plastic casing |
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| CN111048362A (en) | 2020-04-21 |
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