CN2231450Y

CN2231450Y - Phase interruption protective device for circuit breaker

Info

Publication number: CN2231450Y
Application number: CN 95244339
Authority: CN
Inventors: 顾文华
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-07-04
Filing date: 1995-07-04
Publication date: 1996-07-17
Anticipated expiration: 2005-07-04

Abstract

The utility model relates to a phase interruption protective device for a circuit breaker, comprising a main bimetal strip (1) fixed with a heating element (20), a main guide plate (2) positioned at the right of the main bimetal strip (1), and a tripping mechanism. The phase interruption protective device for a circuit breaker is characterized in that the phase interruption protective device for a circuit breaker also comprises a differential guide plate (3) and a lever (21) which are arranged at the left of the main bimetallic strip (1). The main guide plate (2) and the differential guide plate (3) are respectively movably connected with the lever (21). When a three phase power supply appears phase interruption, the utility model cuts off the power supply of a motor to protect the motor from burning out.

Description

The open phase protection of circuit breaker

The utility model relates to a kind of circuit breaker.

In the prior art, the plastic shell current limiting circuit breaker is applicable to and exchanges in 660 volts following, circuit that electric current 0.1 to 40 is pacified, as the overload short-circuit protection of distribution, motor, illuminating line.In the like product; the 3VE1 type circuit breaker that machine tool ﹠ electrical appliances factory, Beijing introduces Siemens technique production is typical overload protection circuit breaker; but this circuit breaker does not have the open phase protection effect, when providing three phase mains for motor, often causes burning of motor because of the phase failure.

The purpose of this utility model is to provide a kind of open phase protection of circuit breaker, in order to cooperate to finish phase failure protection function with circuit breaker.

The technical solution of the utility model is: comprise the main bimetal leaf that is fixed with heater element, leading plate, the tripping mechanism that is positioned at main bimetal leaf right side; It also comprises differential guide plate and the lever that main bimetal leaf left side is provided with, and described leading plate and differential guide plate flexibly connect with lever respectively.

The utility model compared with prior art has following advantage:

(1). when three-phase passes to overload current, owing to the bimetal leaf heated bending, make leading plate and differential guide plate promote the trigger end of leverage in release simultaneously, circuit breaker trip is not so setting of the present utility model influences the thermal overload protection of circuit breaker.

(2). when one mutually the outage after; the main bimetal leaf cooling of this phase resiles left; the differential guide plate in main bimetal leaf left side is moved to the left; and two-phase passes to 1.15 times of setting currents in addition; it is crooked to the right that this two-phase master bimetal leaf is heated; the leading plate on main bimetal leaf right side is moved right; thereby driving lever reverses; because lever has mobile amplification; so the protection of the dropout after phase failure action is very fast; only need phase failure a few minutes can make circuit breaker trip, thereby can protect motor to make it not to be subjected to burn.

The utility model will be further described below in conjunction with drawings and Examples:

Accompanying drawing 1 is the structural front view of this circuit breaker;

Accompanying drawing 2 is the vertical view of the open phase protection of accompanying drawing 1; Wherein:

[1]. main bimetal leaf; [2]. leading plate; [3]. differential guide plate; [4]. button; [5]. moving iron core; [6]. screw; [7]. tension disc; [9]. solenoid; [10]. flexible cord; [11]. touch bridge; [12]. support; [13]. fixed contact; [14]. moving contact; [15]. arc extinguishing grid pieces; [16]. conducting rod; [17]. terminal block; [18]. pressing line frame; [19]. screw; [20]. heater element; [21]. lever; [22]. the electric current pointer; [23]. auxilliary bimetal leaf; [24]. micrometer adjusting screw;

Embodiment: comprise the main bimetal leaf [1] that is fixed with heater element [20], leading plate [2], the tripping mechanism that is positioned at main bimetal leaf [1] right side; It also comprises differential guide plate [3] and the lever [21] that main bimetal leaf [1] left side is provided with, and described leading plate [2] and differential guide plate [3] flexibly connect with lever [21] respectively.So-called main bimetal leaf [1] right side refers to main bimetal leaf crooked direction one side in back of being heated, and the left side is restorable direction one side in main bimetal leaf cooling back.Extension pin on the leading plate [2] is arranged at the right side of every mutually main bimetal leaf [1] respectively, and same, the extension pin on the differential guide plate [3] is arranged at the left side of every mutually main bimetal leaf [1] respectively.Described leading plate [2] and differential guide plate [3] are provided with rotating shaft, and after two holes on the lever [21] were passed in described two rotating shafts, leading plate [2], differential guide plate [3] formed respectively with lever [21] and be rotationally connected.Like this when three-phase passes to electric current simultaneously; main bimetal leaf [1] is heated crooked to the right; driving leading plate [2] moves to right; driving differential guide plate [3] again by lever [21] also moves right; if the electric current of three-phase is excessive, the amplitude that then main bimetal leaf [1] is crooked to the right is big, is enough to promote lever [21] and promotes auxilliary bimetal leaf [23] to the right; make the tripping mechanism action, play the effect of overload protection.When one cuts off the power supply mutually, this mutually main bimetal leaf [1] cooling resiles left, driving differential guide plate [3] is moved to the left, and there have electric two-phase master's bimetal leaf [1] to be heated in addition to be crooked to the right, driving leading plate [2] moves right, because leading plate [2], differential guide plate [3] is connected to two rotating shafts place of lever [21], so lever [21] is that rotate in the center of circle with the junction of leading plate [2] and lever [21], differential guide plate [3] rotates counterclockwise with the junction of lever [21], since described lever [21] from leading plate [2], the junction of differential guide plate [3] extends to form trigger end to the right, so this trigger end moves right (seeing accompanying drawing 2).The right side of described lever [21] is provided with auxilliary bimetal leaf [23], and this auxilliary bimetal leaf [23] is near the trigger end of lever [21], and the right side of described auxilliary bimetal leaf [23] is provided with the trigger end of tripping mechanism.When the trigger end of lever [21] touches auxilliary bimetal leaf [23], the release action, deenergization plays the described auxilliary bimetal leaf of open phase protection effect [23] and is provided with the micrometer adjusting screw [24] that is used to regulate distance between auxilliary bimetal leaf [23] and the lever [21].Can use the distance between micrometer adjusting screw [24] adjustment (adjusting) lever [21] and the auxilliary bimetal leaf [23] before the product export, in order to the operating value that opens circuit of adjust this circuit breaker overload current and broken phase current.

Claims

1. the open phase protection of a circuit breaker comprises the main bimetal leaf [1] that is fixed with heater element [20], leading plate [2], the tripping mechanism that is positioned at main bimetal leaf [1] right side; It is characterized in that: it also comprises differential guide plate [3] and the lever [21] that main bimetal leaf [1] left side is provided with, and described leading plate [2] and differential guide plate [3] flexibly connect with lever [21] respectively.

2. the open phase protection of circuit breaker according to claim 1; it is characterized in that: described leading plate [2] and differential guide plate [3] are provided with rotating shaft; after two holes on the lever [21] were passed in described two rotating shafts, leading plate [2], differential guide plate [3] formed respectively with lever [21] and are rotationally connected.

3. the open phase protection of circuit breaker according to claim 1 is characterized in that: described lever [21] extends to form trigger end to the right from the junction with leading plate [2], differential guide plate [3].

4. according to the open phase protection of claim 1 or 3 described circuit breakers; it is characterized in that: the right side of described lever [21] is provided with auxilliary bimetal leaf [23]; should assist the trigger end of bimetal leaf [23] near thick stick sheet [21], the right side of described auxilliary bimetal leaf [23] is provided with the trigger end of tripping mechanism.

5. the open phase protection of circuit breaker according to claim 4, it is characterized in that: described auxilliary bimetal leaf [23] is provided with the micrometer adjusting screw [24] that is used to regulate distance between auxilliary bimetal leaf [23] and the lever [21].