CN201994251U

CN201994251U - Miniature circuit breaker

Info

Publication number: CN201994251U
Application number: CN2011200440107U
Authority: CN
Inventors: 沈士涛
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-02-21
Filing date: 2011-02-21
Publication date: 2011-09-28
Anticipated expiration: 2021-02-21

Abstract

The utility model relates to a miniature circuit breaker which comprises a shell, a movable terminal and a static terminal, wherein an accommodating zone is formed inside the shell, the movable terminal and the static terminal are fixed in the shell, the outer ends of the movable terminal and the static terminal extend out of the shell, the inner end of the movable terminal is connected with a static contact, the inner end of the static terminal is connected with a bimetallic strip, the bimetallic strip is connected with a movable contact, and the movable contact is directly opposite to the static contact; when the circuit breaker is in on-state, the static contact is in contact with the movable contact; when the circuit breaker is in off-state, the static contact is disengaged from the movable contact; a movable pushbutton penetrates through the shell, the inner end of the pushbutton is propped against a spring, and the other end of the spring is propped against the inner part of the shell; and the inner end of the pushbutton forms a push rod, and the inner end of the push rod is directly opposite the movable contact. In the miniature circuit breaker, by utilizing the elasticity of the thermal bimetallic strip, an upper contact head and a lower contact head are not isolated by insulating material, so that the short-circuit breaking capability of the upper and the lower contact heads of an electric appliance is improved. At the same time, the construction of the overload protection for low current can be realized, and the service life of a mechanical electric appliance is also prolonged.

Description

A kind of miniature circuit breaker

Technical field

The utility model belongs to low-voltage electrical apparatus manufacturing technology field; be specifically related to a kind of miniature circuit breaker; it utilizes the principle of thermo bimetal's characteristic; there is design a little less than the electrical short-circuit breaking capacity at existing overcurrent protection device, on the basis of existing overcurrent protection device, finishes structure and improve and innovation.

Background technology

Present employed overcurrent protection device, its thrermostatic bimetal-plate parallels with two-terminal, uses insulation board to isolate, and improving product useful life, and can guarantee the stability of electric current.There is following defective in existing overcurrent protection device: one, the overload protective device of hand-reset needs one deck insulation board fixed contact and moving contact isolation ability deenergization; because insulation board can produce friction when isolating disjunction; the contact life-span is used in influence; can occur not isolation phenomenon of small probability simultaneously, thereby influence the protective value of product.Two, because the problem of technology and structure has overcurrent protection device breaking capacity difference and action take-off time instability now, service time, no breaking capacity, the protective effect when not having heavy current impact (short circuit) appearred in long meeting.Therefore, be necessary the structure of existing overcurrent protection device is improved and innovated, to overcome above-mentioned defective.

Summary of the invention

The utility model discloses a kind of miniature circuit breaker, it has utilized self elasticity of thermo bimetal to improve the short circuit breaking capacity of electrical equipment, can realize the overcurrent protection ability of little electric current, has improved useful life simultaneously.

The utility model is taked following technical scheme: a kind of miniature circuit breaker, comprise housing, moved end, static terminal, enclosure interior forms holds the district, moved end, static terminal are fixed in housing, stretch out outside the housing outer end of moved end, static terminal, and the inner of moved end connects a fixed contact, and the inner of static terminal connects a bimetal leaf, bimetal leaf connects a moving contact, and moving contact is over against described fixed contact; Described circuit breaker is under the conducting state, and fixed contact touches mutually with moving contact; Described circuit breaker is under the off-state, and fixed contact and moving contact are separated; The housing movable button that stretches through, inner roof pressure one spring of button, the other end of spring peaks at enclosure interior; The inner of button also forms a push rod, and the inner of this push rod is over against moving contact.

Described miniature circuit breaker, a side of housing be to evagination, this protuberance described button that stretches through, and the outer end of button is in outside the protuberance of housing.

Described miniature circuit breaker, housing is formed by connecting by rivet by base and loam cake.

Described miniature circuit breaker, moved end, static terminal are fixed in base by rivet respectively.

Described miniature circuit breaker, moved end and fixed contact riveted joint, static terminal and bimetal leaf riveted joint, bimetal leaf and moving contact riveted joint.

When power source loads during, bimetal leaf temperature distortion, and fixed contact and moving contact are thrown off, play the overcurrent protection effect greater than the rated current of circuit breaker.After the action, when requiring power reset, manually promote button, under the effect of button, promote bimetal leaf and fixed contact is touched mutually with moving contact, fixed contact and moving contact are in closed normality, and meanwhile, button resets to the origin-location under the effect of spring.

Simplify the technology that bimetal leaf is shaped for solving, existing overcurrent protection device adopts insulating material to isolate the method for the power supply of two contacts up and down, has caused the deficiency of overcurrent protection device breaking capacity, can not do the overload protection of little electric current simultaneously.And after after the employing the technical solution of the utility model; it utilizes self elasticity of thrermostatic bimetal-plate; isolate the method for the power supply of two contacts up and down without insulating material; so just improved the electrical equipment short circuit breaking capacity of two contacts up and down; can realize simultaneously making, also can improve mechanical electric apparatus useful life greatly the overload protection of little electric current.

Description of drawings

Fig. 1 is miniature circuit breaker plan structure figure.

Fig. 2 is a miniature circuit breaker side-looking structure chart.

Fig. 3 is the STRUCTURE DECOMPOSITION figure of miniature circuit breaker.

Fig. 4 is a miniature circuit breaker conducting state structural representation.

Fig. 5 is a miniature circuit breaker off-state structural representation.

Embodiment

Below in conjunction with accompanying drawing the utility model embodiment is specified.

Shown in Fig. 1-5, miniature circuit breaker comprises base 1, loam cake 2, button 3, moved end 4, static terminal 5, spring 6, fixed contact 7, moving contact 8, bimetal leaf 9, terminal rivet 10, shell rivet 11, base 1 is connected by three shell rivets 11 with loam cake 2 and forms a housing, this enclosure interior forms holds the district, be used to assemble each parts, and wherein a side to evagination.Moved end 4, static terminal 5 are fixed in base 1 by terminal rivet 10 respectively, stretch out outside the housing outer end of moved end 4, static terminal 5, the inner riveted joint fixed contact 7 of moved end 4, the inner riveted joint bimetal leaf 9 of static terminal 5, riveted joint moving contact 8 on the bimetal leaf 9, moving contact 8 is over against fixed contact 7.Circuit breaker is under the conducting state, and fixed contact 7 touches mutually with moving contact 8, and like this, moved end son 4 and static terminal 5 conductings are referring to Fig. 4.After the circuit breaker action, fixed contact 7 is separated with moving contact 8, and moved end son 4 disconnects with static terminal 5, referring to Fig. 5.

The male part of the housing movable button 3 that stretches through, the outer end of button 3 is in outside the protuberance of housing, inner roof pressure one spring 6, the other end of spring 6 peaks at the inside of base 1; The inner of button 3 also forms a push rod 3-1, and the inner of this push rod is over against moving contact 8.

During assembling, with fixed contact 7 and 4 riveted joints of moved end; Moving contact 8 and bimetal leaf 9 riveted joints with static terminal 5 riveted joints, are put into base 1 respectively more then, adopt 10 riveted joints of terminal rivet; Put into spring 6 and button 3 subsequently, the top of base 1 covers cover plate 2, by shell rivet 11 base 1 and cover plate 2 rivetings is lived at last.

When power source loads during greater than the rated current of circuit breaker, bimetal leaf 9 temperature distortions are thrown off fixed contact 7 and moving contact 8, and open circuit plays the overcurrent protection effect.After the circuit breaker action, when needing power reset, manually promote button 3, under the push rod effect of button 3, promote moving contact 8 on the bimetal leaf 9 and touch mutually with fixed contact 7 and be in closed normality; 3 on button can reset under the effect of spring 6.

To sum up, the utility model provides a kind of simple in structure, easy to operate circuit breaker, and the improvement through structure and bimetal leaf has strengthened its breaking capacity.

Claims

1. miniature circuit breaker, comprise housing, moved end, static terminal, enclosure interior forms holds the district, moved end, static terminal are fixed in housing, stretch out outside the housing outer end of moved end, static terminal, it is characterized in that: the inner of described moved end connects a fixed contact, and the inner of static terminal connects a bimetal leaf, bimetal leaf connects a moving contact, and moving contact is over against described fixed contact; Described circuit breaker is under the conducting state, and fixed contact touches mutually with moving contact; Described circuit breaker is under the off-state, and fixed contact and moving contact are separated; The housing movable button that stretches through, inner roof pressure one spring of button, the other end of spring peaks at enclosure interior; The inner of button also forms a push rod, and the inner of this push rod is over against moving contact.

2. miniature circuit breaker as claimed in claim 1 is characterized in that: a side of described housing is to evagination, this protuberance described button that stretches through, and the outer end of button is in outside the protuberance of housing.

3. miniature circuit breaker as claimed in claim 1 or 2 is characterized in that: described housing is formed by connecting by rivet by base and loam cake.

4. miniature circuit breaker as claimed in claim 3 is characterized in that: described moved end, static terminal are fixed in base by rivet respectively.

5. miniature circuit breaker as claimed in claim 1 is characterized in that: described moved end and fixed contact riveted joint, static terminal and bimetal leaf riveted joint, bimetal leaf and moving contact riveted joint.