CN103367065A - Current-limiting fuse with overcurrent and short circuit protection - Google Patents
Current-limiting fuse with overcurrent and short circuit protection Download PDFInfo
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- CN103367065A CN103367065A CN2012100969694A CN201210096969A CN103367065A CN 103367065 A CN103367065 A CN 103367065A CN 2012100969694 A CN2012100969694 A CN 2012100969694A CN 201210096969 A CN201210096969 A CN 201210096969A CN 103367065 A CN103367065 A CN 103367065A
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Abstract
The invention discloses a current-limiting fuse, which is used for limiting overcurrent and performing short circuit protection and active control for circuits. The current-limiting fuse comprises an insulating shell, a manual switch, a first electromagnetic circuit, a second electromagnetic circuit, a third electromagnetic circuit and a bridge contact system. The manual switch, the first electromagnetic circuit, the second electromagnetic circuit, the third electromagnetic circuit and the bridge contact system are arranged on the insulating shell, a coil of the first electromagnetic circuit adopts a current coil and can sense, compare and respond to incoming current, the current coil is connected with the bridge contact system, a load and a power supply to form a circuit, the circuit can be rapidly cut off in the case of overcurrent or short circuit to protect the load in the circuit, normal operation of the circuit can be restored after contacts are connected via an active control device on the fuse, that is, the connection or disconnection of the contact system can be controlled via application of pulses by the second electromagnetic circuit or the third electromagnetic circuit or via using the manual switch, the state of connection or disconnection can be maintained, and no energy is needed. Thus, the invention provides a current-limiting fuse with integration of the overcurrent and short circuit safety protection and the active control function.
Description
Affiliated technical field
The present invention relates to a kind of current-limited safety unit.Especially keep the current-limited safety unit of the state that is switched on or switched off as input reference quantity, Non-energy-consumption with interchange or DC current values, furtherly: the function with active or Passive Control can adopt hand-reset.
Background technology
In all kinds of circuit, the disposable elements that the most often uses as overcurrent protection is the current insurance silk that adopts metal wire material fusing mode, is with the overcurrent protective switch of bimetal leaf and the air switch of threading off with heat as the reusable device of overcurrent protection; The principle of these three kinds of overcurrent protective devices is to be utilized thermal effect that electric current produces or realizes defencive function according to the operating chacteristics of I2RT.Wherein: after overcurrent fusing occurs when using the current insurance silk, the current insurance silk that must more renew just can work on, this has increased maintenance cost undoubtedly, not reusable, its manner of execution is passive mode, namely only has when the electric current in the circuit reaches the operating current value of current insurance silk just to fuse; The bimetal leaf overcurrent protective switch is to belong to temporary transient overcurrent protective device, will automatically recover and connect circuit when electric current reduces, if this moment, fault was not got rid of, also may cause circuit to go wrong; The air switch of heat dropout action can be reused, though can not return to voluntarily on-state when electric current reduces, does not have active control function, can only manually recover.
Current-limited safety unit provided by the invention adopts electromagnetic induction principle, by the electric current in the current coil response circuit and then the action of promotion contact, realizes overcurrent protection function.Specify for: when the electric current in the circuit reaches setting (operating value), the electromagnetic system of current drives can (several milliseconds) make the contact action and be converted to off-state is exempted overcurrent or short circuit with other parts in the protective circuit impact within the extremely short time, thereby realize the function (passive manner of execution) of overcurrent and short-circuit protection, and when the electric current in the circuit during less than the electric current setting of protector, but the contact of described current-limited safety unit can be in on-state for a long time and Non-energy-consumption keeps; After circuitry cuts, also need not power consumption and just can also can provide a kind of active control function at dissengaged positions current-limited safety unit provided by the invention by holding contact, namely no matter whether the electric current in the circuit reaches operating value, all can be converted to dissengaged positions by connection manually or by applying little electric current (or pulse) ACTIVE CONTROL contact.This moment, the contact of current-limited safety unit can't automatically restore to conducting state, has realized current limliting insurance function of the present invention when electric current in the circuit during less than setting.
When after fault is excluded, needing to restart, can just can make the contact recover on-state by manual or startup automatic recovery device, the deficiency that circuit just can work again and control and overcome the not re-usable defective of current insurance silk and other current-limiting apparatus.The contact of described current-limited safety unit all need not power consumption during the keeping for a long time of conducting or dissengaged positions, be the bistable state form, so energy-saving and environmental protection.
Therefore the present invention has realized passive overcurrent and short-circuit protection, ACTIVE CONTROL and reusable function, energy-saving and environmental protection.
Summary of the invention
For overcome the not reproducible use of current insurance silk, only have passive manner of execution, the defective of irrecoverable and other types overcurrent protective device after the action; the invention provides a kind of current-limited safety unit, realized reusable, can be initiatively or the function of Passive Control and energy-saving and environmental protection.
The present invention solves the scheme that its technical problem adopts: the electromagnetic system that adopts a kind of electric current induction, the first electromagnetic circuit that described electromagnetic system is provided with coil, iron core, yoke, armature and the extension spring that arranges between yoke and armature consists of is as electric current induction, comparison and the responding device of circuit, and described electromagnetic system also arranges a permanent magnetic circuit that contains permanent magnet; For alternating current circuit, described electromagnetic system also be provided with short-circuited conducting sleeve be used for preventing described armature occur shake exchange the vibrationproof magnet steel with guarantee described armature movement steadily; Described current-limited safety unit adopts the bridging contact system as the switch that switches on and off of circuit, described bridging contact system has and switches on and off two kinds of operating states, when the current value of circuit reaches the operating value of described current-limited safety unit, described the first electromagnetic circuit and permanent magnetic circuit are superimposed upon the suction that produces on the described armature greater than the counter-force of described extension spring, accelerated motion occurs with closed the first electromagnetic circuit in described armature, and promote described bridging contact system by the collets that arrange at described armature and cut off circuit, behind closed the first electromagnetic circuit of described armature by permanent magnet holding contact system in off-state.Overcurrent can make the contact be transformed into on-state after eliminating by the active control device that arranges on the described current-limited safety unit, it is normal that circuit recovers.
The present invention arranges a kind of hand switch, and at any time the manual switch contact is for being switched on or switched off state, i.e. manual positive action mode; When being converted to on-state, the contact is in on-state by described extension spring holding contact.
The present invention arranges another electromagnetic circuit and is called the second electromagnetic circuit, the suction that produces at described armature afterwards with the permanent magnetic circuit stack during described the second electromagnetic circuit energising (or pulse) is greater than the counter-force of described extension spring, accelerated motion occurs with closed magnetic circuit in described armature, and promote the conversion of described bridging contact system by described collets, make the bridging contact system transfer disconnection to by connection, be automatic positive action mode, remain open state by permanent magnetic circuit behind the described armature closed magnetic circuit.
The present invention also arranges another electromagnetic circuit and is called the 3rd electromagnetic circuit, produce the counter-force stack of suction and described extension spring greater than the suction of permanent magnetic circuit at described armature during described the 3rd electromagnetic circuit energising (or pulse), action occurs with closed the 3rd electromagnetic circuit in described armature, and promote described bridging contact system by described collets and be converted to connection by disconnection, be in on-state by described extension spring holding contact behind closed the 3rd electromagnetic circuit of described armature.
The present invention is directed in the alternating current circuit, can in described the first electromagnetic system, produce 2 frequency multiplication pulsating fields, thereby cause described armature that shake and closed unsettled problem occur when action, pole-shoe face at described the first electromagnetic circuit iron core is provided with short-circuit ring structure, particularly also be provided with in closing of contact position and exchange the vibrationproof magnet steel
Overcome armature described in the alternating current circuit shake and closed unsettled problem have occured when action.
The invention has the beneficial effects as follows, can be used as the overcurrent protective device of circuit, described overcurrent protective device can be repeatedly used, and holding contact is being switched on or switched off the position but need not to consume energy just after the action; Can adopt easily the positive action mode to control the state of contact, the positive action mode can be mode manually or automatically.
Description of drawings
The present invention is further described below in conjunction with Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7 and corresponding embodiment.Among the figure: 1. the first electromagnetic circuit coil, 2. the second electromagnetic circuit coil, 3. the first electromagnetic circuit iron core, 4. the first electromagnetic circuit yoke, 5. extension spring, 6. armature, 7. short-circuited conducting sleeve, 8. collets, 9. hand switch, 10. rotating shaft, 11. permanent magnets, 12. right movable contact spring, 13. right moving contacts, 14. left moving contacts, 15. left movable contact spring, 16. left fixed contacts, 17. right fixed contacts, 18. static contact spring piece, 19. the 3rd electromagnetic circuit coils, 20. the 3rd electromagnetic circuit iron cores, 21. the 3rd electromagnetic circuit yoke, 22. shells, 23. exchange vibrationproof magnet, 30. DC power supply, 31. loads, 32. current coil leading foots, 33. connecting line, 34. current coil tops, 35. current coils are terminal, 36. current coil, 37. control coils, 38. control coils are terminal, 39. control coil top, 40. DC iron cores, 41. direct current yokes, 42. direct current armature, 43 rotating insulated mechanisms, 44. spherical insulation push rods, 45. the insulation push jack, 46. movable contact springs, 47. moving contacts, 48. fixed contact, 49. static contact spring pieces, 50. insulation crusts.
Fig. 1 is a kind of embodiments of the invention 1 principle schematic
Fig. 2 is the structural representation that a kind of the present invention can manually control embodiment 1
Fig. 3 is that a kind of the present invention can manual/auto control principle schematic diagram
Fig. 4 is that a kind of the present invention can manual/auto control embodiment 2 structural representations
Fig. 5 is that a kind of the present invention can manual/auto control embodiment 3 structural representations
Fig. 6 is a kind of high direct voltage type embodiment of the present invention 4 on-state theory structure schematic diagrames
Fig. 7 is a kind of high direct voltage type embodiment of the present invention 4 off-state theory structure schematic diagrames
Embodiment
In Fig. 1, circuit is in normal operating conditions lower time, contact system is on-state, electric current flows into an end of the first electromagnetic circuit coil 1 from an end A of power supply, the other end of the first electromagnetic circuit coil 1 is electrically connected on the left movable contact spring 15, and be electrically connected to the end of circuit load C by the bridging contact system that is formed by left movable contact spring 15, left moving contact 14, left fixed contact 16, static contact spring piece 18, right fixed contact 17, right moving contact 13 and right movable contact spring 12, the other end of load C connects the other end B of power supply, forms the loop.
The wire diameter of the first electromagnetic circuit coil 1 and the number of turn are that the cut-off current size of controlling is as required chosen, and the bridging contact system can guarantee the reliability of the large electric current of break-make, and fixed contact adopts the flexible contact device effectively to reduce break-make electric arc.
In Fig. 2, the radial center of the first electromagnetic circuit coil 1 is provided with the first electromagnetic circuit iron core 3, one end of described the first electromagnetic circuit iron core 3 becomes the pole-shoe face of the first electromagnetic circuit iron core 3 along the working face position that extends axially the first electromagnetic circuit armature 6 of the first electromagnetic circuit coil 1, for alternating current circuit, also be provided with short-circuited conducting sleeve 7 on the pole-shoe face of described the first electromagnetic circuit iron core 3, the other end of the first electromagnetic circuit iron core 3 extends axially in the hole that the first electromagnetic circuit yoke 4 arranges and is riveted together along the first electromagnetic circuit coil 1, the first electromagnetic circuit yoke 4 is provided with between the upwardly extending hitch gear that upwardly extending hitch gear and armature 6 arranges extension spring 5 is installed, therefore the one side of armature 6 can be close to one side of the cross section of the first electromagnetic circuit yoke 4, the other end of armature 6 extends through the pole shoe of the first electromagnetic circuit iron core 3 downwards to the pole shoe position of permanent magnet 11, and armature 6 is take one side of the cross section of the first electromagnetic circuit yoke 4 as fulcrum and extension spring 5, the first electromagnetic circuit iron core 3 and the first electromagnetic circuit coil 1 consist of the clapper-type electromagnetic structure; Be provided with collets 8 on the armature 6, on the collets 8 respectively riveting right movable contact spring 12 and left movable contact spring 15 are housed, insulated from each other and while and armature 6 insulation between right movable contact spring 12 and the left movable contact spring 15, collets 8 also are provided with chondritic and are installed in the hand switch 9, hand switch 9 is installed on the relevant position of shell 22 by rotating shaft 10, can center on the spot wobble that the first electromagnetic circuit yoke 4 cross sections consist of on one side with moving armature by collets 8 during hand switch 9 action, thereby drive right movable contact spring 12 and 15 swings of left movable contact spring, the other end of right movable contact spring 12 and left movable contact spring 15 is respectively to downward-extension and arrange porose with the moving right contact 13 of riveting dress and left moving contact 14, the relevant position, opposite of right moving contact 13 and left moving contact 14 is respectively arranged with right fixed contact 17 and left fixed contact 16, right fixed contact 17 and left fixed contact 16 respectively riveting are contained on the static contact spring piece 18, for alternating current circuit, the length direction center of static contact spring piece 18 also is provided with vibrationproof magnet steel 23, vibrationproof magnet steel 23 and all fixed contacts and static contact spring piece mutually insulated; One end of the first electromagnetic circuit coil 1 and an end of right movable contact spring 12 are welded with respectively wire, the other end of wire be arranged on shell 22 on and outward extending leading-out terminal be connected with as the usefulness that is connected with external circuit.Said mechanism is assembled in the relevant position of insulating material housing 22.
In Fig. 3, circuit is in normal operating conditions lower time, contact system is on-state, electric current flows into an end of the first electromagnetic circuit coil 1 from an end A of power supply, the other end of the first electromagnetic circuit coil 1 is electrically connected on the left movable contact spring 15, and be electrically connected to the end of circuit load C by the bridging contact system that is formed by left movable contact spring 15, left moving contact 14, left fixed contact 16, static contact spring piece 18, right fixed contact 17, right moving contact 13 and right movable contact spring 12, the other end of load C connects the other end B of power supply, forms the loop.
In Fig. 3, the second electromagnetic circuit coil 2 also is set on the first electromagnetic circuit iron core 3, described the second electromagnetic circuit coil 2 adopts the voltage-type coil, the second electromagnetic circuit coil 2 and the first electromagnetic circuit iron core 3, the first electromagnetic circuit yoke 4 and armature 6 consist of a closed magnetic circuit, and the second electromagnetic circuit coil 2 can adopt pulsed drive.Opposite at the second electromagnetic circuit coil 2 is provided with the 3rd electromagnetic circuit coil 19, the 3rd electromagnetic circuit iron core 20 and the 3rd electromagnetic circuit yoke 21 and consists of another closed magnetic circuit with armature 6 in the position on the lower; Described the 3rd electromagnetic circuit coil 19 adopts the voltage-type coil, the 3rd electromagnetic circuit coil 19 can adopt pulsed drive, the connection pulse power is drawn respectively at the two ends of the second electromagnetic circuit coil 2 and the 3rd electromagnetic circuit coil 20, bridging contact system open circuit during the second electromagnetic circuit coil 2 plugged, the bridging contact system connects circuit during the 3rd electromagnetic circuit coil 20 plugged, therefore realizes automatic positive action control.
In Fig. 4, the radial center of the first electromagnetic circuit coil 1 is provided with the first electromagnetic circuit iron core 3, one end of described the first electromagnetic circuit iron core 3 becomes the pole-shoe face of the first electromagnetic circuit iron core 3 along the working face position that extends axially the first electromagnetic circuit armature 6 of the first electromagnetic circuit coil 1, for alternating current circuit, also be provided with short-circuited conducting sleeve 7 on the pole-shoe face of described the first electromagnetic circuit iron core 3, the other end of the first electromagnetic circuit iron core 3 extends axially in the hole that the first electromagnetic circuit yoke 4 arranges and is riveted together along the first electromagnetic circuit coil 1, the first electromagnetic circuit yoke 4 is provided with between the upwardly extending hitch gear that upwardly extending hitch gear and armature 6 arranges extension spring 5 is installed, therefore the one side of armature 6 can be close to one side of the cross section of the first electromagnetic circuit yoke 4, the other end of armature 6 extends through the pole shoe of the first electromagnetic circuit iron core 3 downwards to the pole shoe position of permanent magnet 11, and armature 6 is take one side of the cross section of the first electromagnetic circuit yoke 4 as fulcrum and extension spring 5, the first electromagnetic circuit iron core 3 and the first electromagnetic circuit coil 1 consist of the clapper-type electromagnetic structure; Be provided with collets 8 on the armature 6, on the collets 8 respectively riveting right movable contact spring 12 and left movable contact spring 15 are housed, insulated from each other and while and armature 6 insulation between right movable contact spring 12 and the left movable contact spring 15, collets 8 also are provided with chondritic and are installed in the hand switch 9, hand switch 9 is installed on the relevant position of shell 22 by rotating shaft 10, can center on the spot wobble that the first electromagnetic circuit yoke 4 cross sections consist of on one side with moving armature by collets 8 during hand switch 9 action, thereby drive right movable contact spring 12 and 15 swings of left movable contact spring, the other end of right movable contact spring 12 and left movable contact spring 15 is respectively to downward-extension and arrange porose with the moving right contact 13 of riveting dress and left moving contact 14, the relevant position, opposite of right moving contact 13 and left moving contact 14 is respectively arranged with right fixed contact 17 and left fixed contact 16, right fixed contact 17 and left fixed contact 16 respectively riveting are contained on the static contact spring piece 18, for alternating current circuit, the length direction center of static contact spring piece 18 also is provided with vibrationproof magnet steel 23, vibrationproof magnet steel 23 and all fixed contacts and static contact spring piece mutually insulated; One end of the first electromagnetic circuit coil 1 and an end of right movable contact spring 12 are welded with respectively wire, the other end of wire be arranged on shell 22 on and outward extending leading-out terminal be connected with as the usefulness that is connected with external circuit.Said mechanism is assembled in the relevant position of insulating material housing 22.
In Fig. 4, the second electromagnetic circuit coil 2 also is set on the first electromagnetic circuit iron core 3, described the second electromagnetic circuit coil 2 adopts the voltage-type coil, the second electromagnetic circuit coil 2 and the first electromagnetic circuit iron core 3, the first electromagnetic circuit yoke 4 and armature 6 consist of a closed magnetic circuit, and the second electromagnetic circuit coil 2 can adopt pulsed drive.Opposite at the second electromagnetic circuit coil 2 is provided with the 3rd electromagnetic circuit coil 19, the 3rd electromagnetic circuit iron core 20 and the 3rd electromagnetic circuit yoke 21 and consists of another closed magnetic circuit with armature 6 in the position on the lower; The other end of armature 6 extends through the pole shoe of the pole shoe of the first electromagnetic circuit iron core 3 and permanent magnet 11 downwards until the pole shoe position of the 3rd electromagnetic circuit iron core 20, described the 3rd electromagnetic circuit coil 19 adopts the voltage-type coil, the 3rd electromagnetic circuit coil 19 can adopt pulsed drive, the connection pulse power is drawn respectively at the two ends of the second electromagnetic circuit coil 2 and the 3rd electromagnetic circuit coil 20, bridging contact system open circuit during the second electromagnetic circuit coil 2 plugged, the bridging contact system connects circuit during the 3rd electromagnetic circuit coil 20 plugged, therefore realizes automatic positive action control.
In Fig. 5, the radial center of the first electromagnetic circuit coil 1 is provided with the first electromagnetic circuit iron core 3, one end of described the first electromagnetic circuit iron core 3 becomes the pole-shoe face of the first electromagnetic circuit iron core 3 along the working face position that extends axially the first electromagnetic circuit armature 6 of the first electromagnetic circuit coil 1, for alternating current circuit, also be provided with short-circuited conducting sleeve 7 on the pole-shoe face of described the first electromagnetic circuit iron core 3, the other end of the first electromagnetic circuit iron core 3 extends axially in the hole that the first electromagnetic circuit yoke 4 arranges and is riveted together along the first electromagnetic circuit coil 1, the first electromagnetic circuit yoke 4 is provided with between the upwardly extending hitch gear that upwardly extending hitch gear and armature 6 arranges extension spring 5 is installed, therefore the one side of armature 6 can be close to one side of the cross section of the first electromagnetic circuit yoke 4, the other end of armature 6 extends through the pole shoe of the first electromagnetic circuit iron core 3 downwards to the pole shoe position of permanent magnet 11, and armature 6 is take one side of the cross section of the first electromagnetic circuit yoke 4 as fulcrum and extension spring 5, the first electromagnetic circuit iron core 3 and the first electromagnetic circuit coil 1 consist of the clapper-type electromagnetic structure; Be provided with collets 8 on the armature 6, on the collets 8 respectively riveting right movable contact spring 12 and left movable contact spring 15 are housed, insulated from each other and while and armature 6 insulation between right movable contact spring 12 and the left movable contact spring 15, collets 8 also are provided with chondritic and are installed in the hand switch 9, hand switch 9 is installed on the relevant position of shell 22 by rotating shaft 10, can center on the spot wobble that the first electromagnetic circuit yoke 4 cross sections consist of on one side with moving armature by collets 8 during hand switch 9 action, thereby drive right movable contact spring 12 and 15 swings of left movable contact spring, the other end of right movable contact spring 12 and left movable contact spring 15 is respectively to downward-extension and arrange porose with the moving right contact 13 of riveting dress and left moving contact 14, the relevant position, opposite of right moving contact 13 and left moving contact 14 is respectively arranged with right fixed contact 17 and left fixed contact 16, right fixed contact 17 and left fixed contact 16 respectively riveting are contained on the static contact spring piece 18, for alternating current circuit, the length direction center of static contact spring piece 18 also is provided with vibrationproof magnet steel 23, vibrationproof magnet steel 23 and all fixed contacts and static contact spring piece mutually insulated; One end of the first electromagnetic circuit coil 1 and an end of right movable contact spring 12 are welded with respectively wire, the other end of wire be arranged on shell 22 on and outward extending leading-out terminal be connected with as the usefulness that is connected with external circuit.Said mechanism is assembled in the relevant position of insulating material housing 22.
In Fig. 5, be provided with on the first electromagnetic circuit iron core 3 the second electromagnetic circuit coil 2 and and the upwardly extending hitch gear that arranges of the upwardly extending hitch gear that arranges of the upper end of the first electromagnetic circuit iron core 3, the first electromagnetic circuit yoke 4, armature 6 and the first electromagnetic circuit yoke 4 and armature 6 between closed magnetic circuit of extension spring 5 formations of installing.
In Fig. 5, be provided with the 3rd electromagnetic circuit coil 19, the 3rd electromagnetic circuit iron core 20 and the 3rd electromagnetic circuit yoke 21 in the top position of the second electromagnetic circuit coil 2 and consist of another closed magnetic circuit with armature 6.
Fig. 6 is a kind of direct current current-limiting protector embodiment with control coil, in insulation crust 50, be provided with by current coil 36, DC iron core 40, direct current yoke 41, the electromagnetic system that permanent-magnet steel between direct current armature 42 and direct current armature 42 each pole shoe forms, in insulation crust 50, also be provided with for the fixing rotating insulated mechanism 43 of direct current armature 42, rotating insulated mechanism 43 is provided with spherical insulation push rod 44, spherical insulation push rod 44 can promote to insulate push jack 45 move left and right and pass to the movable contact spring 46 that riveting has moving contact 47, contact system is disconnected or connection, the position, opposite of moving contact 47 is provided with the static contact spring piece 49 that riveting has filled fixed contact 48, insulation crust 50 also is provided with control coil 37, the beginning of control coil 37, end can be drawn separately.
In Fig. 6, circuit is in normal operating conditions lower time, electric current in the circuit does not reach the operating value of current coil 36, under the effect of permanent-magnet steel and movable contact spring 46 precompressions, fixedly the insulated rotary mechanism 43 of direct current armature 42 clockwise rotates the adhesive of pole-shoe face on the lower-left of the lower-left pole shoe that makes direct current armature 42 and direct current yoke 41, the adhesive of the upper right pole shoe of direct current armature 42 and the right upper pole boot upper of direct current yoke 41 and by the permanent-magnet steel hold mode, drive simultaneously spherical insulation push rod 44 and move right, the transmission by insulation push jack 45 is connected moving contact 47 and fixed contact 48.At this moment, the positive pole of DC power supply 30 is connected with an end of static contact spring piece 49, the fixed contact 48 of riveting on the other end of static contact spring piece 49 keeps on-state with moving contact 47, the other end of movable contact spring 46 is fixed on the shell 50 and with the top 34 of current coil 36 and is connected, current coil end 35 is connected (connector 33 shown in Figure 6 is the principle signal) by the connector 33 that is arranged on shell 50 inside with an end of current coil leading foot 32, the other end of current coil leading foot 32 is connected with an end of load 31, the other end of load 31 is connected with the negative pole of DC power supply 31, the circuit loop when forming normal operation.
In Fig. 7; when circuit is in overcurrent or short circuit; electric current in the circuit reaches the operating value of current coil 36; the electromagnetic attraction that current coil 36 produces is enough to overcome the counter-force that permanent-magnet steel and movable contact spring 46 precompressions produce; causing fixedly, the insulated rotary mechanism 43 of direct current armature 42 rotates counterclockwise; make the adhesive of the upper left pole-shoe face of the upper left pole shoe of direct current armature 42 and direct current yoke 41; the adhesive of the bottom right pole shoe of direct current armature 42 and the bottom right pole-shoe face of direct current yoke 41 and by the permanent-magnet steel hold mode; driving simultaneously spherical insulation push rod 44 is moved to the left; transmission by insulation push jack 45 also is moved to the left movable contact spring 46 and drives moving contact 47 and disconnects with fixed contact 48; therefore circuit loop is cut off, and plays the impact that overcurrent or short circuit are avoided in protective circuit load 31.The wire diameter of current coil 36 and the number of turn are that the cut-off current size of controlling is as required chosen.
In Fig. 6 and Fig. 7, also be provided with control coil 37, as long as between the top 39 and terminal 38 of control coil 37, apply the small voltage pulse, the electromagnetic attraction that control coil 37 produces just can overcome counter-force make direct current armature 42 is housed insulated rotary mechanism clockwise or be rotated counterclockwise, and it is mobile to the left or to the right to drive spherical insulation push rod 44, transmission by insulation push jack 45 disconnects or connection moving contact 47 and fixed contact 48, by changing control coil top 39 and being connected 38 connection polarity, just controlled braking contact 47 and fixed contact 48 are disconnection or on-state, and by permanent-magnet steel holding contact state.
Claims (18)
1. current-limited safety unit with overcurrent and short-circuit protection; comprise the first electromagnetic circuit coil (1); the bridging contact system is characterized in that the current mode coil (1) that arranges in the described current-limited safety unit and bridging contact system are for being connected in series and being connected with electric power loop with load C.
2. a kind of current-limited safety unit with overcurrent and short-circuit protection according to claim 1; an end that it is characterized in that described the first electromagnetic circuit coil (1) is electrically connected with an end of power supply; the other end of electromagnetic circuit coil (1) is electrically connected with left movable contact spring (15) in the described bridging contact system; and through left moving contact (14); left fixed contact (16); static contact spring piece (18); right fixed contact (17); right moving contact (13) and right movable contact spring (12) are electrically connected on the end of load C, the other end of the other end electric connection of power supply of load C.
3. a kind of current-limited safety unit with overcurrent and short-circuit protection according to claim 2; it is characterized in that: the electromagnetic system that is provided with a current mode; comprise: the first electromagnetic circuit coil (1); the first electromagnetic circuit iron core (3); the first electromagnetic circuit yoke (4); armature (6) and be connected in extension spring (5) between the first electromagnetic circuit yoke (4) and the armature (6); in insulation crust (22), be provided with permanent magnet (11); described current mode electromagnetic system can be responded to according to the current value that flows into the first electromagnetic circuit coil (1); relatively and response, armature when reaching setting (6) action and by permanent magnet (11) hold mode.
4. according to claim 3 a kind of current-limited safety unit with overcurrent and short-circuit protection; it is characterized in that: in alternating current circuit; be provided with short-circuited conducting sleeve (7) on the pole-shoe face of described the first electromagnetic circuit iron core (3); the length direction center of described static contact spring piece (18) is provided with vibrationproof magnet steel (23), vibrationproof magnet steel (23) and all fixed contacts and static contact spring piece mutually insulated.
5. current-limited safety unit according to claim 1 and 2, it is characterized in that: described bridging contact system comprises left movable contact spring (15), left moving contact (14), left fixed contact (16), static contact spring piece (18), right fixed contact (17), right moving contact (13), right movable contact spring (12), collets (8) and armature (6); Armature (6) and collets (8), right movable contact spring (12) and left movable contact spring (15) riveting are fitted together and are insulated from each other, being fitted together with right moving contact (13) and left moving contact (14) riveting respectively of right movable contact spring (12) and left movable contact spring (15), the relevant position, opposite of right moving contact (13) and left moving contact (14) is respectively arranged with right fixed contact (17) and left fixed contact (16), right fixed contact (17) and left fixed contact (16) respectively riveting are contained on the static contact spring piece (18), and described bridging contact system switches on and off two states.
6. according to claim 1 to described a kind of current-limited safety unit with overcurrent and short-circuit protection of one of 5, it is characterized in that: also be provided with hand switch, conversion bridge-type contact system is to being switched on or switched off state.
One kind have overcurrent and a short-circuit protection can be manually and the automatic current-limited safety unit of conversion; comprise: be provided with the first electromagnetic circuit coil (1); one end of the first electromagnetic circuit coil (1) is electrically connected with an end of power supply; the other end of electromagnetic circuit coil (1) is electrically connected with left movable contact spring (15) in the bridging contact system; and through left moving contact (14); left fixed contact (16); static contact spring piece (18); right fixed contact (17); right moving contact (13) and right movable contact spring (12) are electrically connected on the end of load C; the other end of the other end electric connection of power supply of load C is characterized in that: the current mode coil 1 that arranges in the described current-limited safety unit and bridging contact system are for being connected in series and being connected with electric power loop with load C.
According to claim 7 a kind of have overcurrent and a short-circuit protection can be manually and the automatic current-limited safety unit of conversion; it is characterized in that: the electromagnetic system of set current mode; comprise: the first electromagnetic circuit coil (1); the first electromagnetic circuit iron core (3); the first electromagnetic circuit yoke (4); armature (6) and be connected in extension spring (5) between the first electromagnetic circuit yoke (4) and the armature (6); described current mode electromagnetic system is provided with permanent magnet (11); described current mode electromagnetic system is responded to according to the current value that flows into the first electromagnetic circuit coil (1); relatively and response, armature when meeting or exceeding setting (6) action and by permanent magnet (11) hold mode.
9. described according to claim 7 can be manually and the automatic current-limited safety unit of conversion, it is characterized in that: in alternating current circuit, be provided with short-circuited conducting sleeve (7) on the pole-shoe face of described the first electromagnetic circuit iron core (3), the length direction center of described static contact spring piece (18) is provided with vibrationproof magnet steel (23), vibrationproof magnet steel (23) and all fixed contacts and static contact spring piece mutually insulated.
10. described according to claim 7 can be manually and the automatic current-limited safety unit of conversion, it is characterized in that: described bridging contact system comprises left movable contact spring (15), left moving contact (14), left fixed contact (16), static contact spring piece (18), right fixed contact (17), right moving contact (13), right movable contact spring (12), collets (8) and armature (6); Armature (6) and collets (8), right movable contact spring (12) and left movable contact spring (15) riveting are fitted together and are insulated from each other, being fitted together with right moving contact (13) and left moving contact (14) riveting respectively of right movable contact spring (12) and left movable contact spring (15), the relevant position of right moving contact (13) and left moving contact (14) is respectively arranged with right fixed contact (17) and left fixed contact (16), right fixed contact (17) and left fixed contact (16) respectively riveting are contained on the static contact spring piece (18), and described bridging contact system switches on and off two states.
11. according to claim 7 a kind of have overcurrent and a short-circuit protection can be manually and the automatic current-limited safety unit of conversion, it is characterized in that: also be provided with hand switch, manual switch bridging contact system is to being switched on or switched off state.
12. according to claim 7 a kind of have overcurrent and a short-circuit protection can be manually and the automatic current-limited safety unit of conversion; it is characterized in that: on described the first electromagnetic circuit iron core (3), also be provided with the second electromagnetic circuit coil (2); the second electromagnetic circuit coil (2) is used for auto-action and is broken circuit by pulsed drive.
13. according to claim 7 or 12 described a kind of have overcurrent and a short-circuit protection can be manually and the automatic current-limited safety unit of conversion; it is characterized in that: also be provided with the 3rd electromagnetic circuit; comprise: the 3rd electromagnetic circuit coil (19); the 3rd electromagnetic circuit iron core (20) and the 3rd electromagnetic circuit yoke (21); the 3rd electromagnetic circuit coil (19) is used for auto-action and is connected circuit by pulsed drive.
14. according to claim 13 a kind of have overcurrent and a short-circuit protection can be manually and the automatic current-limited safety unit of conversion, it is characterized in that: placement and shared armature (6) are with closed magnetic circuit about described the 3rd electromagnetic circuit and the first electromagnetic circuit.
15. according to claim 13 a kind of have overcurrent and a short-circuit protection can be manually and the automatic current-limited safety unit of conversion, it is characterized in that: described the 3rd electromagnetic circuit and the first electromagnetic circuit place up and down and shared armature (6) with closed magnetic circuit.
16. direct current current-limiting protector with control coil, it is characterized in that: comprise an electromagnetic system, it comprises current coil (36), DC iron core (40), direct current yoke (41), direct current armature (42), the wire diameter of current coil (36) and the number of turn are that the cut-off current size of controlling is as required chosen, also be provided with for the fixing rotating insulated mechanism (43) of direct current armature (42), rotating insulated mechanism (43) is provided with spherical insulation push rod (44), spherical insulation push rod (44) promotes insulation push jack (45) move left and right, to the insulate move left and right of push jack (45) of insulation push jack (45) passes to riveting and has the movable contact spring of moving contact (47) (46), the position, opposite of moving contact (47) to be provided with the static contact spring piece (49) that riveting has filled fixed contact (48); Also be provided with control coil (37), beginning, the end of control coil (37) are drawn separately.
17. a kind of direct current current-limiting protector with control coil according to claim 16, it is characterized in that: the positive pole of DC power supply (30) is connected with an end of static contact spring piece (49), the fixed contact (48) of riveting on the other end of static contact spring piece (49) keeps in touch or remains open with moving contact (47), the other end of movable contact spring (46) is fixed in shell (50) and upward and with the top (34) of current coil (36) is connected, current coil terminal (35) is connected by an end of the current coil leading foot (32) on being arranged on the inner connector (33) of shell (50) and being fixed in shell (50), the other end of current coil leading foot (32) is connected with an end of load (31), the other end of load (31) is connected with the negative pole of DC power supply (31), forms circuit loop.
18. a kind of direct current current-limiting protector with control coil according to claim 16, it is characterized in that: between the top (39) of control coil (37) and terminal (38), apply the small voltage pulse, the electromagnetic attraction that control coil (37) produces just overcome counter-force make direct current armature (42) is housed insulated rotary mechanism clockwise or be rotated counterclockwise, and it is mobile to the left or to the right to drive spherical insulation push rod (44), transmission by insulation push jack (45) disconnects or connection moving contact (47) and fixed contact (48), by changing control coil top (39) and being connected the connection polarity of (38), just controlled braking contact (47) is disconnection or on-state with fixed contact (48), and by permanent-magnet steel holding contact state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100969694A CN103367065A (en) | 2012-04-05 | 2012-04-05 | Current-limiting fuse with overcurrent and short circuit protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100969694A CN103367065A (en) | 2012-04-05 | 2012-04-05 | Current-limiting fuse with overcurrent and short circuit protection |
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| Publication Number | Publication Date |
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| CN103367065A true CN103367065A (en) | 2013-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100969694A Pending CN103367065A (en) | 2012-04-05 | 2012-04-05 | Current-limiting fuse with overcurrent and short circuit protection |
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| CN (1) | CN103367065A (en) |
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| CN104501111A (en) * | 2014-11-20 | 2015-04-08 | 广西大学 | Magnetic type over-current or over-voltage protection table lamp |
| CN106847568A (en) * | 2017-04-07 | 2017-06-13 | 张中尧 | Multi-functional automatic switchover device and the operation/cutting method realized using the switch |
| CN106972472A (en) * | 2017-05-23 | 2017-07-21 | 苏州木山云智能科技有限公司 | A kind of current limiter |
| CN107864683A (en) * | 2015-06-01 | 2018-03-30 | 维纳尔电气***有限公司 | Current interrupter |
| CN109036841A (en) * | 2018-10-15 | 2018-12-18 | 泉州闲克鞋业有限公司 | A kind of protection device for high-voltage capacitor of open air protection against electric shock and breakdown |
| CN110660607A (en) * | 2019-09-30 | 2020-01-07 | 顾天琪 | Bridge type contact load switch and smart electric meter |
| CN110828252A (en) * | 2019-11-21 | 2020-02-21 | 南京普暴教育科技有限公司 | Robot programming device for teaching robot program |
| CN110829360A (en) * | 2019-11-05 | 2020-02-21 | 天津航空机电有限公司 | Method for controlling high-voltage direct-current circuit breaker by hardware integrated circuit |
| CN110942955A (en) * | 2018-09-21 | 2020-03-31 | 贵州振华群英电器有限公司（国营第八九一厂） | Can increase initial suction balance force formula relay magnetic circuit structure |
| CN111968896A (en) * | 2020-08-18 | 2020-11-20 | 刘剑 | Quick response type recoverable fuse |
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| CN110829360B (en) * | 2019-11-05 | 2021-09-14 | 天津航空机电有限公司 | Method for controlling high-voltage direct-current circuit breaker by hardware integrated circuit |
| CN110828252A (en) * | 2019-11-21 | 2020-02-21 | 南京普暴教育科技有限公司 | Robot programming device for teaching robot program |
| CN110828252B (en) * | 2019-11-21 | 2021-09-07 | 南京普暴教育科技有限公司 | Robot programming device for teaching robot program |
| CN111968896A (en) * | 2020-08-18 | 2020-11-20 | 刘剑 | Quick response type recoverable fuse |
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Application publication date: 20131023 |
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