CN2349664Y - Modularized miniature circuit break - Google Patents

Abstract

The utility model relates to a modularized miniature circuit breaker which comprises a casing. The casing is composed of a panel and a bottom plate, a handle is pivoted in the casing, the handle is connected with a lever by a connecting rod, and the other end of the lever is pivoted with a bracket and a moving contact. A skipping button, a lock catch, a terminal box and an arc-extinguishing device are respectively installed in casing. An electromagnetic oil damping trip is arranged in the casing, and the electromagnetic oil damping trip is connected with a circuit in series. The utility model has the advantages that the action stability is good, the temperature influence of the environment is small, the internal resistance of the product is small, the power consumption is low, the modularized dimension is realized, the cabinet structure and the beautiful appearance are realized, the convenient installation is realized, etc. The utility model is particularly suitable for an area in which the temperature difference is large. In addition, the utility model is convenient to the design selection of an electrical-design person.

Description

A kind of modularization miniature circuit breaker

The utility model belongs to a kind of low-voltage electrical apparatus that is used for low-voltage distribution system, particularly relates to a kind of modularization miniature circuit breaker that electric wiring, power consumption equipment is played overload, short-circuit protection effect.

In the prior art, overcurrent release device in the type circuit breaker of general modularization emblem adopts thermal tripping mechanism to add the complex triip of electromagnetism tripping mechanism combination usually, by being connected on the bimetal leaf in the circuit and forming delayed release with the push rod of this bimetal leaf interlock etc.Overload current occurs when circuit in this circuit breaker, the bimetal leaf bending of slowly generating heat is when reaching predetermined amount of deflection, drive the pushrod movement certain distance, " pinning " state of cancel system system, moving contact separates rapidly under the spring force effect, and circuit is disconnected.Overload current is big more, and bimetal leaf heating bending is fast more, therefore obtains anti-time limit characteristic, thereby reaches the overload protection purpose.In addition; form moving release of wink by the solenoid and iron core, yoke and the push rod etc. that are connected in the circuit; short circuit current appears in circuit; produce enough big screwed pipe power in the coil, inhale moving iron core immediately, drive push rod; " pinning " state of cancel system again; moving contact separates rapidly under the spring force effect, and circuit is disconnected, and reaches the purpose of moving protection of short circuit wink.The defective of being brought by its structure in this circuit breaker is that the circuit breaker deferred action time is influenced by environmental temperature, ambient temperature is high more, and circuit breaker is short more opening time, and ambient temperature is low more, circuit breaker is long more operate time, thereby has influenced the actual current capacity of circuit breaker.In addition, the repetitive operation less stable of bimetal leaf, relatively poor to the protection effect that protected object rose.Also have, be connected on the bimetal leaf in the circuit, because of its resistance value is bigger, so the crooked energy that consumes of its heating is also just bigger.Have again, if use double-metal sheet type circuit breaker, electrical design personnel's design to select for use calculating loaded down with trivial details.After calculating load current; also need to select different correction factors for use according to different ambient temperatures, different mounting condition (being installed in the fully sheathed case) as intensive; calculate short-circuiting device and allow ampacity; fall and hold the rated current of selecting circuit breaker for use, workload is big and big with the matching error of protected object.

The purpose of this utility model is to overcome existing defective in the prior art, provides a kind of action stability good, and is influenced by ambient temperature little, the modularization miniature circuit breaker that energy consumption is low.

To achieve these goals, the utility model has adopted following technical scheme:

This modularization miniature circuit breaker comprises that one is made of the plastic casing of middle cavity after involutory panel, base plate; Handle is hubbed on panel and the base plate by axle, and handle has spring; One end of handle is connected with a end of lever on being hubbed on panel, base plate by connecting rod, the other end of lever be pivoted a support and a moving contact; Tripping is hubbed on panel, the base plate, and the one end is equipped with a breach for the deduction of support one end, and the other end then deducts in the groove of snap close one end; Snap close is hubbed on panel, the base plate; One is sleeved on the spring on the Handle axis, and its other end phase epitaxy extends in the mounting groove on the snap close; Pass in and out the line junction block, be entrenched on panel, the base plate, also connect a fixed contact on the junction block of the first end of its nearly movable contact; The place also is equipped with the arc-control device that is made of flash barrier and arc control device at nearly dynamic and static contact; Also be equipped with an electromagnetism oil damping formula release in by the middle cavity of the plastic casing that panel, base plate constituted, an end of this release magnetizing coil is connected with junction block by lead, and the other end then is connected with moving contact by lead.

The utility model has adopted electromagnetism oil damping formula release, and it is good that it has an action stability, characteristics such as little influenced by ambient temperature, and the product internal resistance is little, low in energy consumption, has obvious energy-saving effect, and the overall dimension modularization is small and exquisite attractive in appearance, and is easy for installation.Silicone oil in lubricating cup viscosity in-50～200 ℃ of scopes keeps constant substantially, so the overcurrent protection characteristic is not influenced by variation of ambient temperature substantially, and repetitive operation precision height, thereby the scope of application is wider, is particularly suitable for the bigger area of the temperature difference and uses.In addition, also made things convenient for electrical design personnel's design to select for use, the designer just can directly select the release rated current for use, with the matching precision height of protected object as long as go out ampacity according to load calculation.

The utility model will be further described below in conjunction with accompanying drawing and embodiment.

Fig. 1 is the utility model internal structure schematic diagram;

Fig. 2 is the structural representation of electromagnetism oil damping formula release in the utility model;

Fig. 3 is Fig. 5 upward view;

Fig. 4 is Fig. 5 right view;

Fig. 5 is the utility model external structure front view;

Fig. 6 is Fig. 5 left view;

Fig. 7 is Fig. 5 vertical view;

Fig. 8 is Fig. 5 rearview.

With reference to Fig. 1, the utility model comprises that one constitutes the plastic casing of middle cavity, and this plastic casing is made of panel 17, base plate 21, and by rivet 16 that panel 17, base plate 21 is fixedly connected.Overcurrent trip, operating mechanism, contact and arc-control device, turnover line junction block etc. are set in the cavity.

In operating mechanism of the present utility model, handle 7 is hubbed on panel 17 and the base plate 21 by axle 8, and handle 7 has spring 6.

One end of handle 7 is connected with a end of lever 11 on being hubbed on panel 17, base plate 21 by connecting rod 9, the other end of lever 11 be pivoted a support 12 and a moving contact 15.

Tripping 10 is hubbed on panel 17, the base plate 21, and the one end is equipped with a breach for the deduction of support 12 1 ends, and the other end then deducts in the groove of snap close 4 one ends.

Snap close 4 is hubbed on panel 17, the base plate 21.

One is sleeved on the spring 5 on the Handle axis 8, and its other end phase epitaxy extends in the mounting groove on the snap close 4.

Turnover line junction block 1,3 is entrenched on panel 17, the base plate 21, also connects a fixed contact 14 on the junction block 3 of its nearly moving contact 15 1 ends.

Constituted arc-control device by ionic formula grid sheet arc control device 19 that form and the flash barrier 18 that is located at moving contact 15, fixed contact 14 both sides.

Also be equipped with an electromagnetism oil damping formula release 2 in the middle cavity of the plastic casing that is made of panel 17, base plate 21, an end of this release magnetizing coil 25 is connected with junction block 1 by lead, and the other end then is connected with moving contact 15 by lead 13.

With reference to Fig. 2, above-mentioned electromagnetism oil damping formula release 2 comprises a lubricating cup 24, be equipped with unshakable in one's determination 23 in this lubricating cup 24, this iron core 23 is connected with spring 31 unshakable in one's determination, lubricating cup 24 is also filled with silicone oil 30, and through rolling sealing, this lubricating cup 24 is put in magnetizing coil 25 with pole shoe 29 for 24 mouthfuls of lubricating cups, and fixedly connected with yoke 32, armature 28 is contained on the yoke 32.Iron core 23, yoke 32 and armature 28 form a magnetic loop.

With reference to Fig. 1,2, electromagnetism oil damping formula release 2 also comprises a push rod 27, these push rod 27 1 ends can be connected with armature 28, and accept the thrust of armature 28, its other end is facing to the lower end of snap close 4, push rod 27 is put in the pusher bar support 33 on being fixed in panel 17, base plate 21, and back-moving spring 26 is housed.

Operating state and operation principle when the utility model uses are as follows: when closed, pull handle 7 to the right, connecting rod 9 promotes lever 11 and support 12 moves clockwise, support 12 drives moving contact 15 and moves to fixed contact 14 directions, when two contact closure, by mechanical chain, make to keep certain pressure on the contact.At this moment, under the effect of spring 5, tripping 10 deductions form " pinning " state in the groove of snap close 4 one ends.

When the need opening operation, pull handle 7 left, connecting rod 9 is crossed " dead point ", under the effect of spring, dynamic and static contact 15,14 is separated rapidly.

When overcurrent (overload or short circuit) took place, after overcurrent trip 2 actions disconnected circuit breaker, because the effect of spring 5, operating mechanism heavily entered " pinning " state again automatically, can carry out closure, opening operation again.

Under normal circumstances, flow through rated current in the magnetizing coil 25, the screwed pipe power that magnetizing coil 25 produces is less, unshakable in one's determination 23 under the effect of spring 31 unshakable in one's determination, remains on the bottom of lubricating cup 24, and electromagnetic attraction is not enough to inhale moving armature 28, so release is failure to actuate, circuit breaker is not threaded off.

When overcurrent occurring, the screwed pipe power that magnetizing coil 25 is produced strengthens, and unshakable in one's determination 23 overcome the pressure of spring 31 unshakable in one's determination and the resistance of silicone oil 30, move upward gradually, and magnetic resistance reduces gradually, the corresponding increase of the suction of armature 28.When unshakable in one's determination 23 move to certain position, the suction of armature 28 is greater than the counter-force of back-moving spring 31, armature 28 rapid adhesives, promote push rod 27 motions, push rod 27 other ends promote the lower end of snap close 4, and snap close 4 is turned clockwise, throw off with tripping 10, " pinning " state of releasing, dynamic and static contact 15,14 separates rapidly, and circuit breaker is disconnected.Be subjected to damping action when moving upward owing to iron core 23 and produce time-delay, electric current is big more, and 23 motions unshakable in one's determination are fast more, and operate time is also short more, therefore obtains inverse time protection characteristic, reaches the protection purpose of overload.

When in the magnetizing coil 25 during short circuit current flow, produce enough big screwed pipe power in the magnetizing coil 25, even iron core 23 does not move, also armature 28 instantaneous adhesives can be made circuit breaker disconnect in moment, thereby obtain the short-circuit protection purpose.

Bottom of the present utility model also is provided with clamp 20, and circuit breaker can be installed on the international guide rail easily and quickly, and it is also very convenient to change circuit breaker.

Claims (3)

1, a kind of modularization miniature circuit breaker, comprise one by panel (17), the involutory back of base plate (21) constitutes the plastic casing of middle cavity, handle (7) is hubbed on panel (17) and the base plate (21) by axle (8), handle (7) has spring (6), one end of handle (7) is by connecting rod (9) and be hubbed on panel (17), one end of the lever (11) on the base plate (21) is connected, the other end of lever (11) be pivoted a support (12) and a moving contact (15), tripping (10) is hubbed on panel (17), on the base plate (21), the one end is equipped with a breach for the deduction of support (12) one ends, the other end then deducts in the groove of snap close (4) one ends, snap close (4) is hubbed on panel (17), on the base plate (21), one is sleeved on the spring (5) on the Handle axis (8), its other end phase epitaxy extends in the mounting groove on the snap close (4), turnover line junction block (1,3) be entrenched in panel (17), base plate is (on 21, also connect a fixed contact (14) on the junction block (3) of its nearly moving contact (15) one ends, near moving, fixed contact (15,14) locate also to be equipped with the arc-control device that is constituted by flash barrier (18) and arc control device (19), it is characterized in that: by panel (17), also be equipped with an electromagnetism oil damping formula release (2) in the middle cavity of the plastic casing that base plate (21) is constituted, one end of this release magnetizing coil (25) is connected with junction block (1) by lead, and the other end then is connected with moving contact (15) by lead (13).

2, modularization miniature circuit breaker according to claim 1, it is characterized in that: electromagnetism oil damping formula release (2) comprises a lubricating cup (24), be equipped with iron core (23) in this lubricating cup (24), this iron core (23) is connected with spring unshakable in one's determination (31), lubricating cup (24) is also filled with silicone oil (30), and through rolling sealing, put in magnetizing coil (25) by this lubricating cup (24) with pole shoe (29) for lubricating cup (24) mouth, and fixedly connected with yoke (32), armature (28) is contained on the yoke (32).

3, modularization miniature circuit breaker according to claim 1, it is characterized in that: electromagnetism oil damping formula release (2) also comprises a push rod (27), these push rod (27) one ends can be connected with armature (28), and accept the thrust of armature (28), its other end is facing to the lower end of snap close (4), push rod (27) is put in the pusher bar support (33) on being fixed in panel (17), base plate (21), and back-moving spring (26) is housed.

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