CN112151318A - Circuit breaker - Google Patents

Abstract

The invention relates to the field of low-voltage electrical appliances, in particular to a circuit breaker, which comprises a shell and a circuit breaker pole circuit arranged in the shell, wherein the circuit breaker pole circuit comprises a button mechanism, an electric operating device, an operating mechanism and a contact mechanism; the shell comprises a base and an upper cover, the contact mechanism comprises a moving contact and a fixed contact which are matched with each other, and the electric operating device comprises a motor and a gear set; the button mechanism is in driving connection with the operating mechanism, the motor is in driving fit with the operating mechanism through a gear set, and the operating mechanism is in driving connection with the moving contact; the circuit breaker also comprises a first control circuit board and a second control circuit board which are arranged in a stacked mode, the motor and the first control circuit board are respectively arranged on the base, the second control circuit board is located between the first control circuit board and the upper cover, and the gear set is arranged between the second control circuit board and the upper cover; the circuit breaker has reasonable internal layout and compact structure.

Description

Circuit breaker

Technical Field

The invention relates to the field of low-voltage electrical appliances, in particular to a circuit breaker.

Background

The existing circuit breaker mostly has the following problems:

firstly, due to the fact that the layout of components inside the circuit breaker is unreasonable, the circuit breaker is large in specification and cannot meet the installation requirement of a small space;

secondly, the temperature rise of the short-circuit protection mechanism of the existing circuit breaker is large, and the production cost of a wire assembly is high;

thirdly, when the overload protection mechanism of the existing circuit breaker passes large current, the temperature rise is too large;

fourthly, the installation space of the control circuit board of the existing circuit breaker is insufficient, which is not beneficial to the installation and design of the control circuit board;

fifth, the existing circuit breaker has no reliable working state detection means.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a circuit breaker which is reasonable in internal layout and compact in structure.

In order to achieve the purpose, the invention adopts the following technical scheme:

a circuit breaker comprises a shell and a circuit breaker pole circuit arranged in the shell, wherein the circuit breaker pole circuit comprises a button mechanism 2a, an electric operating device 3a, an operating mechanism 4a and a contact mechanism; the shell comprises a base 1-1a and an upper cover 1-4a, the contact mechanism comprises a moving contact 8-1a and a static contact 8-2a which are matched with each other, and the electric operating device 3a comprises a motor 3-1a and a gear set 3-2 a; the button mechanism 2a is in driving connection with the operating mechanism 4a, the motor 3-1a is in driving fit with the operating mechanism 4a through the gear set 3-2a, and the operating mechanism 4a is in driving connection with the moving contact 8-1 a; the circuit breaker further comprises a first control circuit board 5-1b and a second control circuit board 5-2b which are arranged in a stacked mode, the motor 3-1a and the first control circuit board 5-1b are arranged on the base 1-1a respectively, the second control circuit board 5-2b is located between the first control circuit board 5-1b and the upper cover 1-4a, and the gear set 3-2a is arranged between the second control circuit board 5-2b and the upper cover 1-4 a.

Preferably, the first control circuit board 5-1b comprises a motor avoiding opening arranged at one end thereof, and the motor 3-1a is arranged at one side of the first control circuit board 5-1b and is positioned in the motor avoiding opening; the second control circuit board 5-2b is located between the motor 3-1a and the upper cover 1-4 a.

Preferably, in the gear set, the rotating shafts of the gears respectively penetrate through the second control circuit board 5-2b and then are fixed on the base 1-1 a.

Preferably, the circuit breaker further comprises a first detecting member 6-1b and a second detecting member 6-2b respectively arranged on the second control circuit board 5-2b and respectively matched with the button mechanism 2a and the gear set 3-2 a.

Preferably, the first detecting member 6-1b and the second detecting member 6-2b are both microswitches, and the first detecting member 6-1a is perpendicular to the arrangement direction of the second detecting member 6-2 a.

Preferably, the gear set 3-2a includes a final driving gear 3-20a in driving engagement with the operating mechanism 4a, and a gear driving boss is provided on one side of the final driving gear 3-20 to be in driving engagement with the second detecting member 6-2 a.

Preferably, the shell further comprises a first partition board 1-2a arranged between the base 1-1a and the upper cover 1-4a, and the first control circuit board 5-1b is arranged between the base 1-1a and the first partition board 1-2 a; the operating mechanism 4a and the contact mechanism are both arranged on the second partition board 1-2a and positioned between the second partition board 1-2a and the upper cover 1-4 a.

Preferably, the first control circuit board 5-1b comprises a first sampling element 7-1b and a second sampling element 7-2 b; the circuit breaker also comprises a through pole circuit arranged in the shell, wherein the through pole circuit comprises a through pole wiring board 1 b; the first sampling element 7-1b is connected with the static contact 8-2a, and the second sampling element 7-2b is connected with the through pole wiring board 1 b.

Preferably, the circuit breaker pole further comprises an overload protection mechanism 7a, and the overload protection mechanism 7a comprises a bimetallic strip 7-1a connected with a static contact 8-2 a.

Preferably, the first control circuit board 5-1b further comprises a motor connecting plug 7-5b, and the motor 3a is connected with the motor connecting plug 7-5b through a connecting wire.

According to the circuit breaker, the first control circuit board 5-1b and the second control circuit board 5-2b are arranged in a stacked mode, the motor 3-1a is arranged between the second control circuit board 5-2b and the base 1-1a, and the gear set 3-2a is arranged between the second control circuit board 5-2b and the upper cover 1-4a, so that the layout is reasonable and compact, the internal space of the shell can be saved, and the overall size of the circuit breaker can be reduced. In addition, the first detecting member 6-1b realizes the detection of the position of the button mechanism 2a, and the second detecting member 6-2b realizes the detection of the position of the gear in the gear set, so that the operating state (including the closing state, the opening state and the tripping state) of the circuit breaker can be judged from the output signals of the first detecting member 6-1b and the second detecting member 6-2 b.

Drawings

Fig. 1 is a schematic view of the structure of the circuit breaker of the present invention;

figure 2 is a schematic diagram of an exploded structure of the circuit breaker of the present invention;

FIG. 3 is a schematic view of the configuration of the base and control circuit board assembly of the present invention;

FIG. 4 is a schematic diagram of the construction of a first separator and breaker pole circuit of the present invention;

FIG. 5 is a schematic view of the second separator plate, breaker pole terminal block, and overload protection mechanism of the present invention;

FIG. 6 is a schematic view of the structure of a second separator according to the present invention;

FIG. 7 is a schematic view of the structure of a first separator according to the present invention;

FIG. 8 is a schematic view of the connection of the short circuit protection mechanism, breaker conductive plate and second breaker terminal of the present invention;

FIG. 9 is a schematic structural view of the short circuit protection mechanism of the present invention;

FIG. 10 is a schematic view of the construction of the coil of the present invention;

FIG. 11 is a schematic view of the base of the present invention;

fig. 12 is a schematic structural view of the upper cover of the present invention.

Detailed Description

The following description will further describe embodiments of the circuit breaker of the present invention with reference to the embodiments shown in fig. 1 to 12. The circuit breaker of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1-4 and 12, the circuit breaker of the present invention, preferably a plug-in circuit breaker, includes a housing and a breaker pole circuit disposed in the housing, the housing includes a base 1-1a and an upper cover 1-4a, the breaker pole circuit includes a button mechanism 2a, an operating mechanism 4a and a contact mechanism, the contact mechanism includes a moving contact 8-1a and a static contact 8-2a, the button mechanism 2a is inserted into one end of the housing and is drivingly connected to the operating mechanism 4a, and the operating mechanism 4a is drivingly connected to the moving contact 8-1 a; and the button mechanism 2a is pressed/pulled, and the moving contact 8-1a and the static contact 8-2a are driven to be closed/opened through the operating mechanism 4a, so that the circuit breaker is switched on/off.

Preferably, as shown in fig. 1 to 4, the circuit breaker of the present invention further includes a through pole circuit disposed in the case, the through pole circuit including a through pole terminal block 1b and first and second through pole terminals 4-1b and 4-2b connected to both ends of the through pole terminal block 1b, respectively. That is, the terminals at the two ends of the straight-through pole circuit are directly connected through a wire without a break point.

Preferably, as shown in fig. 1 to 3, the breaker pole circuit further includes an electric operating device 3a, the electric operating device 3a includes a motor 3-1a and a gear set 3-2a, the motor 3-1a is in driving fit with the operating mechanism 4a through the gear set 3-2a, and the electric operating device 3a drives the moving contact 8-1a and the fixed contact 8-2a to be closed through the operating mechanism 4a, so as to close the breaker. Furthermore, the electric operating device 3a drives the breaker to open through the operating mechanism 4a, or the electric operating device 3a drives the operating mechanism 4a to operate through the button mechanism 2a, so that the breaker is opened.

Preferably, as shown in fig. 1-4, the circuit breaker further comprises a short-circuit protection mechanism 5a, an overload protection mechanism 7a and an arc extinguishing chamber 6 a; the short-circuit protection mechanism 5a and the overload protection mechanism 7a are respectively matched with the operating mechanism 4a in a driving way, and when the breaker is in short-circuit or overload fault, the breaker is driven to be opened or tripped through the operating mechanism 4 a; the arc extinguish chamber 6a is matched with the contact mechanism to extinguish electric arcs generated when the moving contact 8-1a and the static contact 8-2a are closed/disconnected. At a cost, one or more of the short-circuit protection means 5a, the overload protection means 7a and the arc extinguishing chamber 6a can be eliminated, depending on the actual requirements.

Preferably, as shown in fig. 1 to 4, the breaker pole circuit further comprises a first breaker pole terminal 3-1b and a second breaker pole terminal 3-2b, and the contact mechanism, the overload protection mechanism 7a and the short-circuit protection mechanism 5a are connected in series between the first breaker pole terminal 3-1b and the second breaker pole terminal 3-2 b. Further, as shown in fig. 1, the first breaker terminal 3-1b, the overload protection mechanism 7a, the contact mechanism, the short-circuit protection mechanism 5a and the second breaker terminal 3-2b are connected in series in sequence.

Preferably, as shown in fig. 1, the first breaker terminal 3-1b and the button mechanism 2a are arranged side by side at one end of the housing, and the second breaker terminal 3-2b is arranged at the other end of the housing; the operating mechanism 4a and the overload protection mechanism 7a are arranged in the middle of the shell; the short-circuit protection mechanism 5a and the arc extinguish chamber 6a are arranged side by side; the button mechanism 2a and the short-circuit protection mechanism 5a are respectively positioned at two sides of the operating mechanism 4a, and the first breaker terminal 3-1b and the arc extinguish chamber 6a are positioned at two sides of the overload protection mechanism 7 a; the short-circuit protection means 5a is located between the second breaker terminal 3-2b and the operating means 4 a. It is noted that the positions of the overload protection 7a and the short-circuit protection 5a can be interchanged. Further, as shown in fig. 2 to 4, the first through-pole terminal 4-1b and the first disconnection-pole terminal 3-1b are disposed at one end of the housing; the second through pole terminal 4-2b and the second breaker pole terminal 3-2b are arranged at the other end of the shell side by side at intervals.

The main improvement points of the circuit breaker are as follows:

preferably, as shown in fig. 1, 2 and 4, the housing further comprises a second partition plate 1-3a arranged between the base 1-1a and the upper cover 1-4a, and the second partition plate 1-3a is arranged side by side with the button mechanism 2 a; the circuit breaker pole circuit also comprises a circuit breaker pole wiring board 2b connected in series in the circuit breaker pole circuit, the motor 3-1a is arranged on the base 1-1a and positioned between the base 1-1a and the second partition board 1-3a, and the circuit breaker pole wiring board 2b is arranged on the second partition board 1-3a and positioned between the second partition board 1-3a and the upper cover 1-4 a. The position layout of the circuit breaker pole wiring board 2b, the second partition boards 1-3a and the motor 3-a and the position layout of the second partition boards 1-3a and the button mechanism 2a realize the full utilization of the inner space of the shell, make the inner structure of the circuit breaker more compact and contribute to the miniaturization development trend of the circuit breaker. Further, as shown in fig. 2, 4 and 5, the second partition board 1-3a includes a second partition board outer section 1-30a and a second partition board inner section 1-31a connected in sequence, two sides of the second partition board outer section 1-30a are respectively provided with a terminal assembling groove, a first breaker terminal 3-1b and a first through terminal 4-1b are respectively arranged in the terminal assembling groove, and the motor 3-1a and the breaker terminal board 2b are respectively located at two sides of the second partition board inner section 1-31 a. The second partition board 1-3a not only realizes the stacking arrangement of the first breaker pole terminal 3-1b and the first through pole terminal 4-1b, but also ensures the insulativity between the two, thereby not only making the internal layout of the circuit breaker more compact, but also ensuring the insulating property of the circuit breaker.

Preferably, as shown in fig. 1 to 4, the breaker pole terminal block 2b is connected in series between the first breaker pole terminal 3-1b and the overload protection mechanism 7 a.

Preferably, as shown in fig. 2 and 3, the circuit breaker of the present invention further includes a control circuit board group disposed in the housing, the control circuit board group including a first control circuit board 5-1 b; as shown in fig. 2-4, the housing further includes a first partition plate 1-2a disposed between the base 1-1a and the upper cover 1-4 a; the operating mechanism 4a, the contact mechanism, the short-circuit protection mechanism 5a, the overload protection mechanism 7a and the arc extinguish chamber 6a are respectively arranged on the first partition plate 1-2a and are respectively positioned between the first partition plate 1-2a and the upper cover 1-4a, and the first control circuit board 5-1b is arranged on the base 1-1a and is positioned between the base 1-1a and the first partition plate 1-2 a. The first partition plate 1-2a and the base 1-1a are matched to provide a larger assembly space for the first control circuit board 5-1b, so that the first control circuit board 5-1b is assembled conveniently, the first control circuit board 5-1b is designed conveniently, and the third partition plate 1-2a separates the first control circuit board 5-1b from the contact mechanism and the arc extinguish chamber 6a, so that the influence of electric arc on the first control circuit board 5-1b is reduced to the minimum, the stable work of the first control circuit board 5-1b is ensured, and the service life of the first control circuit board 5-1b is prolonged. Furthermore, the first partition board 1-2a and the second partition board 1-3a are matched, so that the first control circuit board 5-1b and the circuit of the breaker are isolated, and the stability and the service life of the first control circuit board 5-1b are further improved.

Preferably, as shown in fig. 1, 2 and 4, the first partition board 1-2a further includes an arc ignition channel 9a cooperating with the arc extinguishing chamber 6a, an inlet of the arc extinguishing chamber 6a cooperating with the contact mechanism toward the operating mechanism 4a, and an outlet of the arc extinguishing chamber 6a cooperating opposite to the arc ignition channel 9 a. The cooperation of striking passageway 9a and explosion chamber 6a has avoided the ionized gas or the residual arc of getting rid of from explosion chamber 6a to cause the harm to other components and parts in the circuit breaker, is favorable to guaranteeing the stable work of circuit breaker and prolongs the life of circuit breaker. Further, as shown in fig. 1, a plurality of vertical separating ribs 9-1a and a plurality of transverse separating ribs 9-2a are arranged in the arc striking channel 9a, the plurality of vertical separating ribs 91-a are arranged at one end of the arc striking channel 9a close to the arc extinguishing chamber 6a side by side at intervals, and the plurality of transverse separating ribs 9-2a are arranged at the other end of the arc striking channel 9a in a staggered manner along the extending direction of the arc striking channel 9 a; the extending direction of the vertical separating ribs 9-1a is consistent with the extending direction of the arc striking channel 9a, and the extending direction of the transverse separating ribs 9-2a is crossed with the extending direction of the arc striking channel 9 a. The vertical spacing ribs 9-1a and the horizontal spacing ribs 9-2a realize effective cutting of electric arcs, arc extinguishing efficiency and arc extinguishing effect are improved, and arc extinguishing performance of the circuit breaker is improved.

Preferably, as shown in fig. 2 and 3, the control circuit board group further includes a second control circuit board 5-2b stacked on the first control circuit board 5-1b, and the gear group 3-2a is disposed on the second control circuit board 5-2b between the second control circuit board 5-2b and the upper cover 1-4 a. Further, as shown in fig. 2 and 3, the circuit breaker of the present invention further includes a first detecting member 6-1b and a second detecting member 6-2b provided on the second control circuit board 5-2b, respectively, to be engaged with the button mechanism 2a and the gear train 3-2a, respectively. Further, as shown in fig. 2 and 3, the first detecting member 6-1b and the second detecting member 6-2b are both micro switches. The first detecting member 6-1b detects the position of the button mechanism 2a, and the second detecting member 6-2b detects the position of a gear in the gear set, so that the working state (including a closing state, an opening state and a tripping state) of the circuit breaker can be judged from the output signals of the first detecting member 6-1b and the second detecting member 6-2 b.

Preferably, as shown in fig. 8 and 9, the short-circuit protection mechanism 5a includes a framework 5-4a, an iron core assembly, a mandrel 5-1a, a coil 5-2a and a magnetic yoke 5-3a, wherein the iron core assembly and the mandrel 5-1a are arranged in the middle of the framework 5-4a, the coil 5-2a is sleeved on the framework 5-4a, and the magnetic yoke 5-3a is wrapped outside the coil 5-2 a; the coil 5-2a is of a U-shaped structure and is connected with the contact mechanism in series. The short-circuit protection mechanism 5a is simple in structure, convenient to assemble and beneficial to improving the assembly efficiency of the circuit breaker. Further, the coil 5-2a comprises a coil main body 5-20a, and a first welding pin 5-21a and a second welding pin 5-22a which are respectively connected with two ends of the coil main body 5-20a, wherein the first welding pin 5-21a and the second welding pin 5-22a are arranged in a relatively staggered manner, so that the connection of the coil 5-2a is facilitated.

The circuit breaker of the present invention will be further described with reference to the drawings and the specific embodiments.

As shown in fig. 1-4 and 12, an embodiment of the circuit breaker of the present invention is shown.

As shown in fig. 1-4 and 12, the circuit breaker of the present invention, preferably a plug-in circuit breaker, includes a housing and a breaker pole circuit and a through pole circuit respectively disposed in the housing.

As shown in fig. 1-4, the breaker pole circuit comprises a button mechanism 2a, an electric operating device 3a, an operating mechanism 4a, a contact mechanism, a short-circuit protection mechanism 5a, an overload protection mechanism 7a, an arc extinguishing chamber 6a, a first breaker pole terminal 3b-1 and a second breaker pole terminal 3 b-2; the electric operating device 3a comprises an electric motor 3-1a and a gear set 3-2a, and the contact mechanism comprises a moving contact 8-1a and a static contact 8-2a which are matched with each other; the first breaker pole terminal 3-1b, the overload protection mechanism 7a, the contact mechanism, the short-circuit protection mechanism 5a and the second breaker pole terminal 3-2b are sequentially connected in series; the short-circuit protection mechanism 5a and the overload protection mechanism 7a are respectively in driving fit with the operating mechanism 4a, and when the breaker has a short-circuit fault or an overload fault, the short-circuit protection mechanism 5a or the overload protection mechanism 7a enables the breaker to be opened (or tripped) through the operating mechanism 4 a; the arc extinguish chamber 6a is matched with the contact mechanism and is used for extinguishing electric arcs generated when the moving contact 8-1a and the static contact 8-2a are closed/opened; the button mechanism 2a is inserted at one end of the shell and is connected with the operating mechanism 4a in a driving mode, the motor 3-1a is matched with the operating mechanism 4a in a driving mode through the gear set 3-2a, and the operating mechanism 4a is connected with the movable contact 8-1a in a driving mode. Further, as shown in fig. 1, pressing/pulling the button mechanism 2a can drive the moving contact 8-1a and the static contact 8-2a to be closed/opened through the operating mechanism 4a, so as to close/open the circuit breaker; the electric operating device 3a drives the moving contact 8-1a and the static contact 8-2a to be closed/opened through the operating mechanism 4a, and the electric operating device 3a drives the moving contact 8-1a and the static contact 8-2a to be closed/opened through the button mechanism 2a and the operating mechanism 4 a.

Specifically, as shown in fig. 1, the gear set 3-2a of the electric operating device 3a is directly in driving fit with the operating mechanism 4a (the transmission member 4-1a of the operating mechanism 4a) to drive the circuit breaker to close; a drive boss is arranged on one gear in the gear set 3-2a of the electric operating device 3a, and when the circuit breaker is in a closed state, the drive boss is in drive fit with the button mechanism 2a, so that the button mechanism 2a moves (the moving direction is the same as the direction when the button mechanism 2a is pulled) and the circuit breaker is switched off through the operating mechanism 4 a; the electric operating device 3a drives the opening/closing process of the breaker, and the motor 3-1a always rotates towards the same direction. Of course, it should be noted that the electric operating device 3a may be directly in driving cooperation with the operating mechanism 4a to switch on/off the circuit breaker, the motor 3-1a rotates in a first direction to drive the circuit breaker to switch on, and rotates in a second direction to drive the circuit breaker to switch off, the first direction and the second direction are opposite to each other, and the principle is the same as that of the electric operating device driving the circuit breaker to switch on/off in the prior art, and is not described herein again.

Preferably, as shown in fig. 1, 2 and 4, the breaker pole circuit further comprises a breaker pole terminal block 2b, which is connected in series between the first breaker pole terminal 3-1b and the overload protection mechanism 7 a.

Preferably, as shown in fig. 1, 2, 4 and 8, the breaker pole circuit further comprises a breaker pole conductive plate 8b connected in series between the short-circuit protection mechanism 5a and the second breaker pole terminal 3-2 b. Further, the breaker electrode conductive plate 8b is a manganin shunt.

As shown in fig. 4, the through pole circuit includes a through pole terminal plate 1b, and a first through pole terminal 4-1b and a second through pole terminal 4-2b provided at both ends of the through pole terminal plate 1b, respectively.

Preferably, as shown in fig. 1-4, the first breaker terminal 3-1b, the first through terminal 4-1b and the button mechanism 2a are located at the same end of the housing, and the second breaker terminal 3-2b and the second through terminal 4-2b are arranged at intervals side by side at the other end of the housing; the operating mechanism 4a and the overload protection mechanism 7a are arranged in the middle of the shell side by side, the arc extinguish chamber 6a and the short-circuit protection mechanism 5a are arranged in side by side, the electric operating device 3a and the button mechanism 2a are arranged in side by side and are positioned between the first breaker terminal 3-1b and the overload protection mechanism 4-2b, the gear set 3-2a is positioned between the motor 3-1a and the button mechanism 2a, the arc extinguish chamber 6a is positioned between the overload protection mechanism 7a and the second direct-current terminal 4-2b, the short-circuit protection mechanism 5a is positioned between the operating mechanism 4a and the second breaker terminal 3-2b, and the button mechanism 2a and the short-circuit protection mechanism 5a are respectively positioned on two sides of the operating mechanism 4 a.

As shown in fig. 1, 2, 4, 5, an embodiment of the breaker pole terminal block 2b is shown: the circuit breaking pole wiring board 2b comprises an external wiring board 2-5b, an external transition plate 2-2b, a main body plate 2-1b, an internal transition plate 2-3b and an internal wiring board 2-4b which are sequentially connected, the external transition plate 2-2b, the main body plate 2-1b and the internal transition plate 2-3b are integrally in a shape-like structure, the external wiring board 2-5b and the internal wiring board 2-4b respectively extend towards the directions of two ends of the circuit breaking pole wiring board, the external wiring board 2-5a is connected with the first circuit breaking pole wiring board 3-1b, and the internal wiring board 2-4b is connected with an overload protection mechanism 7 a. Further, as shown in fig. 5, the breaker pole terminal plate 2b includes two first stopper pins protruding from one side thereof at a distance. Further, as shown in fig. 5, the breaker pole terminal plate 2b is an integral structure, and is formed by punching and bending a metal plate.

Preferably, as shown in fig. 2 and 3, the circuit breaker of the present invention further comprises a control circuit board group, wherein the control circuit board group comprises a first control circuit board 5-1b and a second control circuit board 5-2b which are respectively arranged in the housing. Further, as shown in fig. 2 and 3, the second control circuit board 5-2b and the first control circuit board 5-1b are stacked, the first control circuit board 5-1b is respectively disposed on the base 1-1a, and the second control circuit board 5-2b is located between the first control circuit board 5-1b and the upper cover 1-4 a.

Preferably, as shown in fig. 2 and 3, the first control circuit board 5-1b includes a first sampling element 7-1b and a second sampling element 7-2b, the first sampling element 7-1b is connected to the fixed contact 8-2a, and the second sampling element 7-2b is connected to the through-pole wiring board 1 b. Further, as shown in fig. 1 and 7, the first partition board 1-2a includes a partition board avoiding hole for avoiding the first sampling element 7-1b and located on the peripheral side wall of the arc striking channel 9a of the first partition board 1-2a, and the first sampling element 7-1b is located in the partition board avoiding hole; the second sampling element 7-2b is located between the side wall of the base 1-1a and the side wall of the first partition 1-2 a.

Preferably, as shown in fig. 2 and 3, the first control wiring board 5-1b further includes a conductive plate connection plug 7-3b, and the disconnection electrode conductive plate 8b is connected to the conductive plate connection plug 7-3b by a connection wire.

Preferably, as shown in fig. 3, the first control circuit board 5-1b further comprises a motor connecting plug 7-5b, and the motor 3-1a is connected with the motor connecting plug 7-5b through a connecting wire.

Preferably, as shown in fig. 2 and 3, the first control circuit board 5-1b further comprises an output signal terminal 7-4b, and the output signal terminal 7-4b is arranged at one end of the first control circuit board 5-1b far away from the operating mechanism 4 a. Furthermore, the output signal terminal 7-4b is a square column structure, and a pair of side walls thereof are respectively provided with a positioning boss.

Preferably, the first control circuit board 5-1b includes a protection circuit and a control circuit of a circuit breaker, and can be used for automatic switching control, current and voltage sampling monitoring, external communication and the like.

Specifically, as shown in the direction of fig. 2, the first sampling element 7-1b, the second sampling element 7-2b, and the conductive plate connection plug 7-3b are disposed at the lower end of the first control circuit board 5-1b, the first sampling element 7-1b and the second sampling element 7-2b are located on the left side of the lower end of the first control circuit board 5-1b, and the conductive plate connection plug 7-3b is located on the right side of the lower end of the first control circuit board 5-1 b; the motor connecting plug 7-5b is arranged at the upper end of the first control circuit board 5-1 b; the output signal terminal 7-4a is arranged in the middle of the lower end of one side of the first control circuit board 5-1 b.

Preferably, as shown in fig. 3, the gear set 3-2a is disposed between the second control circuit board 5-2b and the upper cover 1-4 a. Further, as shown in fig. 3, in the gear set 3-2a, the rotating shafts of the gears respectively pass through the second control circuit board 5-2b and then are fixed on the base 1-1 a.

Preferably, as shown in fig. 2 and 3, the circuit breaker of the present invention further comprises a first detecting member 6-1b and a second detecting member 6-2b provided on the second control circuit board 5-2b, respectively, to be engaged with the push button mechanism 2a and the gear train 3-2a, respectively. Further, as shown in fig. 2 and 3, the first detecting element 6-1b and the second detecting element 6-2b are both microswitches, and the arrangement direction of the first detecting element 6-1b and the second detecting element is vertical. It should be noted that the arrangement directions of the first detecting element 6-1b and the second detecting element 6-2b are perpendicular, so that the swinging plane of the driving rod of the first detecting element 6-1b is perpendicular to the second control circuit board 5-2b, and the swinging plane of the driving rod of the second detecting element 6-2b is parallel to the second control circuit board 5-2b, so that the two better cooperate with the button mechanism 2a and the gear set 3-2a respectively.

Preferably, as shown in fig. 3, the gear set 3-a includes a final driving gear 3-20a which is in driving engagement with the operating mechanism 4a, and a gear driving boss is provided on one side of the final driving gear 3-20a to be in driving engagement with the second detecting member 6-2 a.

Specifically, as shown in fig. 2 and 3, when the button mechanism 2a is pressed to close the circuit breaker through the operating mechanism 4a, the button mechanism 2a presses against the driving rod of the first detecting element 6-1b to trigger the first detecting element 6-1b, and when the button mechanism 2a is pulled to open the circuit breaker through the operating mechanism 4a, the button mechanism 2a is separated from the driving rod of the first detecting element 6-1 a; when the electric operating device 3a drives the breaker to switch on through the operating mechanism 4a, the gear driving boss is pressed against the driving rod of the second detection element 6-2b, the second detection element 6-2b is triggered, and when the electric operating device 3a drives the breaker to switch off through the button mechanism 2a and the operating mechanism 4a, the gear driving boss releases the driving rod of the second detection element 6-1 b.

Preferably, as shown in fig. 1-4, 6-7, 11-12, is one embodiment of the housing: the shell comprises a base 1-1a, an upper cover 1-4a, and a first partition plate 1-2a and a second partition plate 1-3a which are respectively arranged between the base 1-1a and the upper cover 1-4 a.

Preferably, as shown in fig. 1, 2, 4 and 7, the operating mechanism 4a, the overload protection mechanism 7a, the short-circuit protection mechanism 5a and the arc-extinguishing chamber 6a are respectively arranged on the first partition board 1-2a and between the first partition board 1-2a and the upper cover 1-4a, and the first control circuit board 5-1b is arranged on the base 1-1a and between the base 1-1a and the first partition board 1-2 a; the second partition board 1-3a is arranged side by side with the button mechanism 2a, the motor 3-1a is arranged on the base 1-1a and positioned between the second partition boards 1-3a, and the breaker pole terminal board 2b is arranged on the second partition board 1-3a and positioned between the second partition board 1-3a and the upper cover 1-4 a. Further, as shown in fig. 1, 4 and 5, the first breaker terminal 3-1b is disposed on one side of the second partition plate 1-3a and between the second partition plate 1-3a and the base 1-1a, the first straight-through terminal 4-1b is disposed on the other side of the second partition plate 1-3a and between the second partition plate 1-3a and the upper cover 1-4a, and the first straight-through terminal 4-1b and the first breaker terminal 3-1b are stacked in the thickness direction of the case and on both sides of the second partition plate 1-3 a.

Preferably, as shown in fig. 11, the base 1-1a includes a motor mounting chamber 1-10a provided on a bottom wall thereof, and the motor 3-1a is disposed in the motor mounting chamber 1-10 a. The motor 3-1a is reliably limited between the second partition plate 1-3a and the base 1-1a, so that the motor 3-1a is prevented from moving, and the size of the circuit breaker is reduced.

Preferably, as shown in fig. 6, 7 and 11, one side of the through pole terminal board 1b is in limit fit with the first partition board 1-2a and the second partition board 1-3a respectively, and the other side of the through pole terminal board 1b is in limit fit with the base 1-1 a. Further, as shown in fig. 7, the first partition board 1-2a includes a third limiting slot 1-22a, as shown in fig. 6, the second partition board 1-3a includes a second limiting slot 1-33a, as shown in fig. 11, the base 1-1a includes a base limiting slot 1-12a, one side of the through pole wiring board 1b is in insertion limiting fit with the second limiting slot 1-33a and the third limiting slot 1-22a, respectively, and the other side of the through pole wiring board 1b is in insertion limiting fit with the base limiting slot 1-12 a. Specifically, as shown in fig. 11, the base limiting slot 1-12a is disposed on a side wall of the base 1-1a, as shown in fig. 6, the second limiting slot 1-33a is disposed on a side edge of the second partition plate 1-3a facing the base 1-1a, as shown in fig. 7, and the third limiting slot 1-22a is disposed on a side edge of the first partition plate 1-2a facing the base 1-1 a.

Preferably, as shown in fig. 5, the breaker pole terminal plate 2b includes two first limiting pins protruding from one side of the breaker pole terminal plate and spaced apart from each other, and the second partition plate 1-2a includes two first limiting slots 1-32a spaced apart from each other, and the two first limiting pins are inserted into the two first limiting slots 1-32a, respectively.

Preferably, as shown in fig. 1, 2 and 4, the first partition board 1-2a further comprises an arc striking channel 9a cooperating with the arc extinguishing chamber 6 a; the inlet of the arc extinguishing chamber 6a is fitted with a contact arrangement towards the operating mechanism 4a, the contacts of the arc extinguishing chamber 6a being fitted opposite the ignition channel 9 a. Further, as shown in fig. 1, a plurality of vertical separating ribs 9-1a and a plurality of transverse separating ribs 9-2a are arranged in the arc striking channel 9a, the plurality of vertical separating ribs 9-1a are arranged at one end of the arc striking channel 9a close to the arc extinguishing chamber 6a side by side at intervals, and the plurality of transverse separating ribs 9-2a are arranged at the other end of the arc striking channel 9a and are arranged in a staggered and side by side manner along the extending direction of the arc striking channel 9 a; the extending direction of the vertical spacing ribs 9-1a is consistent with the extending direction of the arc striking channel 9a, and the extending direction of the transverse spacing ribs 9-2a is crossed (for example, vertical) with the extending direction of the arc striking channel 9 a.

Preferably, as shown in fig. 3, 7 and 11, the base 1-1a includes a signal terminal fitting groove 1-13a, the first partition board 1-2a includes a signal terminal position limiting table 1-23a disposed at an end portion of a side thereof facing the base 1-1a, and the output signal terminal 7-4b is disposed in the signal terminal fitting groove 1-13a and is limited between the base 1-1a and the signal terminal position limiting table 1-23 a.

Preferably, as shown in fig. 1, 3, 11 and 12, the housing further includes first and second mounting guide ribs 1-11a and 1-40a disposed at one side thereof in spaced apart side-by-side relation, respectively on the side wall of the base 1-1a and the side wall of the upper cover 1-4 a. Further, as shown in fig. 11 and 12, the first mounting guide rib 1-11a and the second mounting guide rib 1-40a each extend in the length direction of the housing. When the circuit breaker is assembled to the installation cabinet or the power distribution cabinet, the first installation guide ribs 1-11a and the second installation guide ribs 1-40a are respectively in limit fit with the cabinet body, so that the circuit breaker is prevented from deviating from a correct position and/or being inclined, and the normal work of the circuit breaker is prevented from being influenced.

As shown in fig. 4 to 6, is an embodiment of the second separator 1 to 3 a: the second partition board 1-3a comprises a second partition board outer section 1-30a and a second partition board inner section 1-31a which are sequentially connected, two sides of the second partition board outer section 1-30a are respectively provided with a terminal assembly groove, a first straight-through pole terminal 4-1b and a first breaker pole terminal 3-1b are respectively arranged in the two terminal assembly grooves, a breaker pole terminal board 2b is arranged on the second partition board inner section 1-31a and is positioned between the second partition board inner section 1-31a and an upper cover 1-4a, and a motor 3-1a is arranged on the base 1-1a and is positioned between the base 1-1a and the second partition board inner section 1-31 a.

Preferably, as shown in fig. 4 to 6, the second partition inner section 1 to 31a includes a first transverse wall 1 to 310a and a first vertical wall 1 to 311a, the first transverse wall 1 to 310a is disposed in the middle of the first vertical wall 1 to 311a, the breaker pole terminal block 2b and the motor 3 to 1a are disposed on both sides of the first transverse wall 1 to 310a, respectively, and a second limit slot 1 to 33a is disposed on a side of the first vertical wall 1 to 311a facing the base 1 to 1 a. Further, as shown in fig. 6, a partition motor limiting groove is formed in one side of the first transverse wall 1-310a facing the base 1-1 a.

Preferably, as shown in fig. 5, the second partition board 2b further includes two first spacing slots 1-32a arranged at intervals. Specifically, as shown in fig. 5, two first limiting slots 1 to 32a are respectively located at two ends of the second partition plate inner sections 1 to 31 a.

As shown in fig. 1, is an embodiment of the button mechanism 2 a: the button mechanism 2a comprises a button part 2-1a, a first connecting rod 2-2a, a connecting part 2-3a and a second connecting rod 2-4a which are connected in sequence, the button part 2-1a is arranged on the shell in a sliding mode, and the second connecting rod 2-4a is connected with a rotating plate 4-4a of the operating mechanism 4a in a driving mode. It should be noted that the push button 2-1a, the first link 2-2a and the connecting member 2-3a can be provided as an integral member, but for better cooperation with the electric operating device 3a (e.g., the electric operating device 3a is in driving cooperation with the connecting member 2-3, and the circuit breaker is opened by the operating mechanism 4a) and for facilitating the setting of a locking mechanism (e.g., a locking mechanism for preventing the circuit breaker from being installed in a mounting cabinet or a power distribution cabinet in a closed state or preventing the circuit breaker from being pulled out of the mounting cabinet or the power distribution cabinet in the closed state), the circuit breaker of the present invention preferably employs the above-mentioned split push button 2 a.

As shown in fig. 1, an embodiment of the operating mechanism 4a is: the operating mechanism 4a comprises a transmission piece 4-1a, a third connecting rod 4-2a, a lock catch piece 4-3a, a rotating plate 4-4a and a trip piece 4-5a, the transmission piece 4-1a and the rotating plate 4-4a are respectively arranged on the first partition board 1-2a in a pivoting mode, the lock catch piece 4-3a and the trip piece 4-5a are respectively arranged on the rotating plate 4-4a in a pivoting mode, the transmission piece 4-1a is connected with the lock catch piece 4-3a through the third connecting rod 4-2a, the rotating plate 4-4a is connected with the moving contact 8-1a in a driving mode, and the overload protection mechanism 7a and the short-circuit protection mechanism 5a are respectively matched with the trip piece 4-1a in a driving mode.

As shown in fig. 1, 2, 4 and 5, an embodiment of the overload protection mechanism 7a is: the overload protection mechanism 7a comprises a bimetallic strip 7-1a and a driving connecting rod 7-2a, one end of the bimetallic strip 7-1a is connected with the static contact 8-2a, and the other end of the bimetallic strip is in driving connection with the tripping piece 4-5a of the operating mechanism 4a through the driving connecting rod 7-2 a. Further, as shown in fig. 1, the first partition board 1-2a includes a guide rail structure 1-21a, one end of the driving link 7-1a is drivingly connected to the trip unit 4-5a, and the other end of the driving link is engaged with the guide rail structure 1-21a, so as to limit and guide the motion path of the driving link 7-1a, thereby ensuring the delayed trip characteristic of the circuit breaker. Further, as shown in fig. 1, the guide rail structure 1-21a is a guide groove provided on the first partition board 1-21 a.

Preferably, as shown in fig. 5, one end of the breaker pole terminal board 2b is connected to the first breaker pole terminal board 3-1b, and the other end is connected to the middle of the bimetallic strip 7-1a and the static contact bridge 8-21a of the static contact 8-2a through the first flexible connection 9-1b and the second flexible connection 9-2b, so that the overall temperature rise of the circuit breaker can be reduced by the shunting manner.

As shown in fig. 8-10, an embodiment of the short-circuit protection mechanism 5a is: the short-circuit protection mechanism 5a comprises a framework 5-4a, an iron core assembly, an ejector rod 5-1a, a coil 5-2a and a magnetic yoke 5-3a, wherein the iron core assembly 5-0a, a spring and the ejector rod 5-1a are respectively arranged in the middle of the framework 5-4a, the coil 5-2a is sleeved on the framework 5-4a, the magnetic yoke 5-3a is wrapped outside the coil 5-2a, and the coil 5-2a is of a U-shaped structure. The coil 5-2a is simple in structure, instantaneous tripping characteristics of the short-circuit protection mechanism 5a are met, heat production can be remarkably reduced, heat dissipation performance is good, and reliability of the short-circuit protection mechanism 5a is guaranteed. And further, the iron core assembly 5-0a comprises a static iron core and a movable iron core, the spring is arranged between the static iron core and the movable iron core, and the ejector rod 5-1a is linked with the movable iron core.

Preferably, as shown in fig. 10, the coil 5-2a comprises a coil body 5-20a and a first welding foot 5-21a and a second welding foot 5-22a connected to two ends of the coil body 5-20a, respectively, wherein the first welding foot 5-21a and the second welding foot 5-22a are arranged in a relative offset manner; the first welding feet 5-21a are connected with the magnetic yoke 5-3a in a welding way and connected with the movable contact 8-1a through welding flexible wires, and the second welding feet 5-22a are connected with one end of the breaker electrode conducting plate 8b in a welding way. The first welding pins 5-21a and the second welding pins 5-22a are respectively welded with the magnetic yoke 5-3a and the open-circuit pole conducting plate 8b, so that the coil 5-2a is reliably positioned, and the integral installation of the short-circuit protection mechanism 5a is facilitated.

Preferably, as shown in fig. 1, 2 and 9, the magnetic yoke 5-3a is a U-shaped structure, the opening of the U-shaped structure of the coil 5-2a faces the side wall of the base 1-1a, the opening of the U-shaped structure of the coil 5-2a faces the first partition board 1-2a, and the opening direction of the U-shaped structure of the magnetic yoke 5-3a is perpendicular to the opening direction of the U-shaped structure of the coil 5-2, which is beneficial to reducing the assembly space occupied by the short-circuit protection mechanism 5 a.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (10)

1. A circuit breaker comprises a shell and a circuit breaker pole circuit arranged in the shell, wherein the circuit breaker pole circuit comprises a button mechanism (2a), an electric operating device (3a), an operating mechanism (4a) and a contact mechanism; the shell comprises a base (1-1a) and an upper cover (1-4a), the contact mechanism comprises a moving contact (8-1a) and a static contact (8-2a) which are matched with each other, and the electric operating device (3a) comprises a motor (3-1a) and a gear set (3-2 a); the button mechanism (2a) is in driving connection with the operating mechanism (4a), the motor (3-1a) is in driving fit with the operating mechanism (4a) through the gear set (3-2a), and the operating mechanism (4a) is in driving connection with the moving contact (8-1 a); the method is characterized in that: the circuit breaker further comprises a first control circuit board (5-1b) and a second control circuit board (5-2b) which are arranged in a stacked mode, the motor (3-1a) and the first control circuit board (5-1b) are arranged on the base (1-1a) respectively, the second control circuit board (5-2b) is located between the first control circuit board (5-1b) and the upper cover (1-4a), and the gear set (3-2a) is arranged between the second control circuit board (5-2b) and the upper cover (1-4).

2. The circuit breaker of claim 1, wherein: the first control circuit board (5-1b) comprises a motor avoiding opening arranged at one end of the first control circuit board, and the motor (3-1a) is arranged at one side of the first control circuit board (5-1b) and is positioned in the motor avoiding opening; the second control circuit board (5-2b) is positioned between the motor (3-1a) and the upper cover (1-4 a).

3. The circuit breaker according to claim 1 or 2, characterized in that: in the gear set, rotating shafts of the gears respectively penetrate through the second control circuit board (5-2b) and then are fixed on the base (1-1 a).

4. The circuit breaker of claim 1, wherein: the circuit breaker further comprises a first detection piece (6-1b) and a second detection piece (6-2b) which are respectively arranged on the second control circuit board (5-2b) and are respectively matched with the button mechanism (2a) and the gear set (3-2 a).

5. The circuit breaker of claim 4, wherein: the first detection piece (6-1b) and the second detection piece (6-2b) are both microswitches, and the arrangement direction of the first detection piece (6-1a) and the arrangement direction of the second detection piece (6-2a) are perpendicular.

6. The circuit breaker of claim 5, wherein: the gear set (3-2a) comprises a final-stage driving gear (3-20a) in driving fit with the operating mechanism (4a), and a gear driving boss is arranged on one side of the final-stage driving gear (3-20) and is in driving fit with the second detection piece (6-2 a).

7. The circuit breaker of claim 1, wherein: the shell further comprises a first partition plate (1-2a) arranged between the base (1-1a) and the upper cover (1-4a), and a first control circuit board (5-1b) is arranged between the base (1-1a) and the first partition plate (1-2 a); the operating mechanism (4a) and the contact mechanism are both arranged on the second partition plate (1-2a) and positioned between the second partition plate (1-2a) and the upper cover (1-4 a).

8. The circuit breaker of claim 7, wherein: the first control circuit board (5-1b) comprises a first sampling element (7-1b) and a second sampling element (7-2 b); the circuit breaker also comprises a through pole circuit arranged in the shell, wherein the through pole circuit comprises a through pole wiring board (1 b); the first sampling element (7-1b) is connected with the static contact (8-2a), and the second sampling element (7-2b) is connected with the through pole wiring board (1 b).

9. The circuit breaker of claim 8, wherein: the circuit of the breaker pole also comprises an overload protection mechanism (7a), wherein the overload protection mechanism (7a) comprises a bimetallic strip (7-1a) connected with a static contact (8-2 a).

10. The circuit breaker of claim 1, wherein: the first control circuit board (5-1b) further comprises a motor connecting plug (7-5b), and the motor (3a) is connected with the motor connecting plug (7-5b) through a connecting wire.

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