CN211578663U

CN211578663U - Circuit breaker

Info

Publication number: CN211578663U
Application number: CN201922068349.XU
Authority: CN
Inventors: 涂兵; 朱俊; 李罗斌
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2019-11-26
Filing date: 2019-11-26
Publication date: 2020-09-25
Anticipated expiration: 2029-11-26

Abstract

A circuit breaker comprises a shell assembly, a contact system, an electric leakage protection mechanism and an electric leakage test mechanism, wherein the contact system, the electric leakage protection mechanism and the electric leakage test mechanism are arranged in the shell assembly, the contact system comprises a handle, a contact mechanism and an operating mechanism, the operating mechanism is driven by the handle to close or open the contact mechanism when the circuit breaker is switched on or switched off, the electric leakage test mechanism comprises an electric leakage test button and an electric leakage test loop matched with a zero sequence current transformer of the electric leakage protection mechanism, the electric leakage test loop comprises a first test contact matched with the electric leakage test button and a second test contact matched with the contact system, the second test contact is kept closed, and the contact system opens the second test contact when the circuit breaker is switched off; the contact system avoids the second test contact when the breaker is switched on, so that the second test contact is reset and kept closed, the contact parameters of the contact mechanism cannot be influenced, and the contact pressure of the contact mechanism during switching on is ensured.

Description

Circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus field especially relates to a circuit breaker.

Background

The circuit breaker that has earth leakage protection in the existing market, especially integral type electromagnetic type residual current operated circuit breaker, in order to test whether the earth leakage protection function of circuit breaker is inefficacy, need insert the circuit with the circuit breaker and with the circuit breaker switching-on earlier, press the test button closed earth leakage test circuit's contact again, through electric leakage test circuit simulation leakage signal, can break off the circuit according to the circuit breaker and judge whether the earth leakage protection function is inefficacy.

However, if the circuit breaker is not closed, that is, the circuit breaker is in an open state, if the test button is pressed to close the contact of the leakage test loop, voltage is generated at the outlet end of the circuit breaker, and a serious potential safety hazard is left. Due to the trend of miniaturization of low-voltage electrical appliances, the volume of the circuit breaker is generally smaller, the internal structure is more compact, if the number of contacts of the leakage test loop is increased, the volume of the circuit breaker is easily increased, and the performance of the circuit breaker is easily reduced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's defect, provide a simple structure, circuit breaker that contact mechanism contact reliability is high.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a circuit breaker comprises a shell assembly, a contact system, an electric leakage protection mechanism and an electric leakage test mechanism, wherein the contact system, the electric leakage protection mechanism and the electric leakage test mechanism are arranged in the shell assembly; the contact system avoids the second test contact when the breaker is switched on, so that the second test contact is reset and kept closed, the test button is used for driving the first test contact to be closed, and the leakage test loop is conducted when the first test contact and the second test contact are both closed.

Preferably, the electric leakage test circuit comprises an intermediate connecting piece, and a first elastic piece and a second elastic piece which are respectively matched with two ends of the intermediate connecting piece, wherein a first test contact forming the electric leakage test circuit is arranged at an interval between the first elastic piece and one end of the intermediate connecting piece, and the first test contact is closed by driving the first elastic piece to be in contact with the intermediate connecting piece by pressing an electric leakage test button; the second elastic piece is in contact fit with the other end of the intermediate connecting piece to form a second testing contact of the electric leakage testing loop, the contact system is not in contact with the second testing contact when the breaker is switched on to enable the second testing contact to be kept closed, and the contact system drives the second elastic piece and the intermediate connecting piece to be separated to disconnect the second testing contact when the breaker is switched off.

Preferably, the contact mechanism comprises a fixed contact and a movable contact which are respectively connected to the circuit; the operating mechanism can drive the static contact to be in contact with and separate from the moving contact; the moving contact comprises a contact support which is pivotally arranged in the shell component and matched with the operating mechanism, and a moving contact plate which is arranged on the contact support, wherein a moving contact matched with the fixed contact is arranged on the moving contact plate; the second test contact is matched with the contact support of the movable contact, and the contact support drives the movable contact to be separated from the fixed contact when the breaker is opened and drives the second elastic piece to be separated from the middle connecting piece; the contact support drives the movable contact to be in contact with the fixed contact when the circuit breaker is switched on, and meanwhile, the contact support is far away from the second elastic piece to enable the second elastic piece to reset.

Preferably, the circuit breaker unit comprises a plurality of circuit breaker units arranged side by side, the circuit breaker units respectively comprise a contact system, at least one circuit breaker unit comprises an electric leakage protection mechanism, a first elastic piece and a second elastic piece of the electric leakage test mechanism are respectively arranged in two different circuit breaker units, the first elastic piece and the second elastic piece are respectively connected with the contact systems of the two circuit breaker units, the middle part of an intermediate connecting piece of the electric leakage test mechanism penetrates through the shell assembly, and two ends of the intermediate connecting piece of the electric leakage test mechanism extend into the circuit breaker units respectively corresponding to the first elastic piece and the second elastic piece.

Preferably, the contact system comprises a handle, a contact mechanism, an operating mechanism, a wiring mechanism, a short-circuit protection mechanism and an overload protection mechanism, the wiring mechanism comprises a left wiring terminal and a right wiring terminal which are respectively arranged at two ends of the circuit breaker unit, the left wiring terminal is connected with the fixed contact through the short-circuit protection mechanism, and the right wiring terminal is connected with the movable contact plate of the movable contact through the overload protection mechanism; a second lead connected between the left wiring terminal of each breaker unit and the short-circuit protection mechanism penetrates through the zero-sequence current transformer; one end of the second elastic piece, which is not matched with the middle connecting piece, is connected with a second lead of the circuit breaker unit provided with the second elastic piece; the first elastic piece is connected with a right wiring terminal of the circuit breaker unit provided with the first elastic piece through the test resistor.

Preferably, the second elastic member includes a second spiral portion pivotally mounted on the housing assembly, and a second contact arm and a second connecting arm respectively disposed at two ends of the second spiral portion, the second spiral portion of the second elastic member and the contact support of the movable contact are disposed at two sides of the middle connecting member, the middle portion of the second contact arm passes through the lower portion of the middle connecting member and then cooperates with the contact support, the contact support drives the movable contact to separate from the fixed contact, pushes the second contact arm to separate from the middle connecting member to disconnect the second test contact, and the contact support drives the movable contact to contact with the fixed contact, and resets the second contact arm and contacts with the middle connecting member to close the second test contact.

Preferably, the second contact arm is in a U-shaped structure, a contact boss is arranged on the contact support, one end of the middle connecting piece is located on the inner side of the second contact arm, one end of the second contact arm is connected with the second spiral part, and a second pushing arm matched with the contact boss is arranged at the other end of the second contact arm.

Preferably, a conducting strip is arranged in the shell assembly, the second elastic piece is clamped on the conducting strip, a clamping groove in limiting fit with the second connecting arm is formed in one end of the conducting strip, and a lower extending piece used for wiring is arranged at the other end of the conducting strip.

Preferably, the contact system still includes short-circuit protection mechanism, the top that contact support one side was kept away from in the intermediate junction spare to the setting of second spiral portion, the conducting strip sets up in one side of handle, is located short-circuit protection mechanism's top, the conducting strip includes the vertical piece and the horizontal piece that one end links to each other to and the slide that links to each other with the horizontal piece other end, indulge the piece setting in second spiral portion horizontally one side, be equipped with on the side of indulging the piece with the spacing complex draw-in groove of second linking arm, the one end of horizontal piece is connected with the bottom of indulging the piece, the other end of horizontal piece is connected with the top of the slide that the slope set up, and short-circuit protection mechanism's top is stretched to the bottom of slide, is equipped.

Preferably, the leakage testing mechanism is arranged between the leakage protection unit and the circuit breaker protection unit, the leakage protection unit and the circuit breaker protection unit respectively comprise contact systems, the contact systems of the leakage protection unit and the circuit breaker protection unit penetrate through a zero sequence current transformer of the leakage testing mechanism, a first elastic piece of the leakage testing mechanism and a leakage testing button of the leakage testing mechanism are arranged in the leakage protection unit, a second elastic piece of the leakage testing mechanism is arranged in the circuit breaker protection unit and is matched with an operating mechanism of the circuit breaker protection unit, a middle partition plate is correspondingly arranged between the leakage protection unit and the circuit breaker protection unit of the shell assembly, a middle connecting piece of the leakage testing mechanism penetrates through the middle partition plate, one end of the middle connecting piece extends into the leakage protection unit and is matched with the first elastic piece, the other end of the middle connecting piece extends into the circuit breaker protection unit and is matched with the second elastic piece.

Preferably, the contact system of the leakage protection unit and the contact system of the circuit breaker protection unit have the same structure, and the contact systems of the leakage protection unit and the circuit breaker protection unit respectively comprise a handle, a contact mechanism, an operating mechanism, a wiring mechanism, a short-circuit protection mechanism and an overload protection mechanism; the contact mechanism comprises a fixed contact and a movable contact which are arranged oppositely, the movable contact comprises a contact support which is pivotally arranged in the shell assembly and matched with the operating mechanism, and a movable contact plate which is arranged on the contact support, a movable contact matched with the fixed contact is arranged on the movable contact plate, the wiring mechanism comprises a left wiring terminal and a right wiring terminal which are respectively arranged at two ends of the circuit breaker unit, the left wiring terminal is connected with the fixed contact through a short-circuit protection mechanism, and the right wiring terminal is connected with the movable contact plate of the movable contact through an overload protection mechanism; the second wire of connection between the left binding post of circuit breaker protection unit and short-circuit protection mechanism passes zero sequence current transformer, the second elastic component of electric leakage test circuit is connected with the second wire of connection between the left binding post of circuit breaker protection unit and short-circuit protection mechanism, and the first elastic component of electric leakage test circuit is connected with the right binding post of electric leakage protection unit through test resistance.

Preferably, the shell assembly is provided with a middle partition plate between the circuit breaker protection unit and the electric leakage protection unit, the middle partition plate is provided with a protruding structure at one side close to the electric leakage protection unit, and a space for accommodating a short-circuit protection mechanism of a contact system in the circuit breaker protection unit is formed at one side of the protruding structure close to the circuit breaker protection unit; the middle connecting piece and the end matched with the second elastic piece are arranged above the short-circuit protection mechanism in the circuit breaker protection unit, and the end matched with the first elastic piece penetrates through the middle partition plate to extend to the top side of the protruding structure to be matched.

Preferably, the intermediate junction spare is the zigzag structure, and the intermediate junction spare includes the connecting plate and respectively with first contact board and the second contact board that the connecting plate both ends are connected, and connecting plate and second contact board set up the one side that is close to circuit breaker protection unit at intermediate bottom, are equipped with the hole of dodging first contact board on the intermediate bottom, and are equipped with the spacing groove that is used for fixed intermediate junction spare on the intermediate bottom, and the side of connecting plate is equipped with the spacing complex limiting plate in outside arch and the spacing groove, be equipped with in the spacing groove with the spacing muscle of limiting plate side spacing complex.

Preferably, the first elastic element comprises a first spiral part which is pivotally mounted on the housing assembly, and a first contact arm and a first connecting arm which are respectively arranged at two ends of the first spiral part, the first contact arm extends between the middle connecting piece and the earth leakage test button, and the first connecting arm is connected with the right terminal of the earth leakage protection unit through the test resistor.

Preferably, the first spiral part is arranged below the electric leakage test button, the first contact arm is of a zigzag structure and comprises a lower cross arm, an upper cross arm and a longitudinal arm connected between the lower cross arm and one end of the upper cross arm, one end of the lower cross arm is connected with the first spiral part, one end of the lower cross arm connected with the longitudinal arm is inclined upwards and then matched with the bottom of the electric leakage test button, the longitudinal arm extends towards the upper part of the middle connecting piece and then is connected with one end of the upper cross arm, the other end of the upper cross arm extends towards the direction close to the middle connecting piece and then is connected with the bending arm, the bending arm is located above one end of the middle connecting piece and bends towards one side far away from the middle connecting piece, and the electric leakage test button can push the lower curved surface at the outer side of the cross arm to be contacted with one end.

The utility model discloses a circuit breaker, electric leakage test circuit has two contacts of first test contact and second test contact, the second test contact keeps closed when the circuit breaker closes a floodgate, contact system drive second test contact disconnection when the circuit breaker separating brake, not only can effectively avoid the danger that the electric leakage test button brought when the circuit breaker separates a floodgate, the second test contact does not contact with contact system when the circuit breaker closes a floodgate in addition, can not influence contact mechanism's contact parameter, the contact pressure of contact mechanism when closing a floodgate has been guaranteed.

In addition, both ends through intermediate junction spare respectively with first elastic component and second elastic component cooperation, not only can effectively utilize limited space in the circuit breaker, avoid increasing the volume of circuit breaker, the second elastic component keeps contacting through self elasticity and intermediate junction spare moreover and forms normally closed contact structure, has simple structure and characteristics with low costs.

Drawings

Fig. 1 is a schematic structural diagram of a circuit breaker according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a circuit breaker unit according to an embodiment of the present invention;

fig. 3 is a cross-sectional view of a circuit breaker according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an electric leakage test circuit according to an embodiment of the present invention;

fig. 5 is a top view of the leakage test circuit according to the embodiment of the present invention;

fig. 6 is a schematic structural diagram of a side of the circuit breaker protection unit away from the earth leakage protection unit according to the embodiment of the present invention;

fig. 7 is a schematic structural diagram of a circuit breaker protection unit near one side of an earth leakage protection unit according to an embodiment of the present invention;

fig. 8 is a partial enlarged view of fig. 6 according to the embodiment of the present invention;

fig. 9 is a schematic structural diagram of a side of the earth leakage protection unit away from the circuit breaker protection unit according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of the leakage protection unit near one side of the circuit breaker protection unit according to the embodiment of the present invention.

Detailed Description

The following describes the circuit breaker according to the present invention with reference to the embodiments shown in fig. 1 to 10. The circuit breaker of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1-2 and 6, the utility model discloses a circuit breaker includes housing assembly to and contact system, earth leakage protection mechanism and the leakage test mechanism of setting in housing assembly, contact system includes handle 21, contact mechanism, operating device 23, wiring mechanism, and contact mechanism is including the static contact 221 and the moving contact 222 that insert the circuit respectively, closes or breaks off contact mechanism through handle 21 drive operating device 23 during circuit breaker combined floodgate and separating brake.

The leakage protection mechanism comprises a zero sequence current transformer 41, when the zero sequence current transformer 41 detects that a leakage fault occurs in the line, the leakage protection mechanism triggers the operating mechanism 23 to trip, and after the operating mechanism 23 loses balance, the operating mechanism drives the fixed contact 221 and the movable contact 222 to be separated to disconnect the line.

As shown in fig. 4-5, the leakage testing mechanism includes a leakage testing button 50 and a leakage testing loop cooperating with the zero sequence current transformer 41 of the leakage protection mechanism, the leakage testing loop includes a first testing contact T1 cooperating with the leakage testing button 50, and a second testing contact T2 cooperating with the contact system, the second testing contact T2 normally remains closed (which may be understood as a normally closed contact), and the contact system opens the second testing contact T2 when the circuit breaker is opened; the contact system dodges the second test contact T2 when the circuit breaker closes, makes second test contact T2 reset and keep closed, test button 50 is used for driving first test contact T1 to close, when first test contact T1 and second test contact T2 are all closed the electric leakage test return circuit switches on and produces the electric leakage fault signal, if the circuit breaker can trip at this moment with the circuit disconnection, then the earth leakage protection of circuit breaker can be effective, otherwise the earth leakage protection function of circuit breaker is invalid.

The utility model discloses a circuit breaker, the electric leakage test circuit has two contacts of first test contact T1 and second test contact T2, second test contact T2 keeps closed when the circuit breaker closes a floodgate, contact system drive second test contact T2 disconnection when the circuit breaker separating brake, not only can effectively avoid the danger that the electric leakage test button 50 brought when the circuit breaker separates a floodgate, second test contact T2 does not contact with contact system when the circuit breaker closes a floodgate, can not influence contact mechanism's contact parameter, the contact pressure of contact mechanism when closing a floodgate has been guaranteed.

As shown in fig. 4-5, the leakage testing circuit of the present invention includes an intermediate connecting member 53, and a first elastic member 51 and a second elastic member 52 respectively engaged with two ends of the intermediate connecting member, wherein the first elastic member 51 and one end of the intermediate connecting member 53 are spaced to form a first testing contact T1 of the leakage testing circuit, and when the leakage testing button 50 is pressed, the first elastic member 51 and the intermediate connecting member 53 are driven to contact to close the first testing contact T1; the second elastic piece 52 is in contact fit with the other end of the intermediate connecting piece 53 to form a second test contact T2 of the leakage test loop, the contact system is not in contact with the second test contact T2 when the circuit breaker is switched on so that the second test contact T2 is kept closed, and the contact system drives the second elastic piece 52 to be separated from the intermediate connecting piece 53 when the circuit breaker is switched off so that the second test contact T2 is disconnected. Both ends through intermediate junction spare 53 cooperate with first elastic component 51 and second elastic component 52 respectively, not only can effectively utilize limited space in the circuit breaker, avoid increasing the volume of circuit breaker, and second elastic component 52 keeps in touch formation normally closed contact structure through self elasticity and intermediate junction spare 53 moreover, has simple structure and characteristics with low costs. Obviously, two independent connecting pieces can be adopted to cooperate with the first elastic piece 51 and the second elastic piece 52 respectively, and both connecting pieces are connected into the electric leakage testing loop. Moreover, the first elastic member 51 and the second elastic member 52 may be two independent elastic members, or may be two elastic structures of the same elastic member, for example, the first elastic member 51 and the second elastic member 52 are two ends of a torsion spring, which all fall within the protection scope of the present invention.

Further, the second test contact T2 cooperates with the contact mechanism of the contact system, by means of which the second test contact T2 is opened and cleared. The contact mechanism comprises a fixed contact 221 and a movable contact 222 which are respectively connected with a line; the operating mechanism 23 can drive the fixed contact 221 to contact with and separate from the movable contact 222; the movable contact 222 comprises a contact support 223 pivotally installed in the housing assembly and matched with the operating mechanism 23, and a movable contact plate 224 arranged on the contact support 223, and a movable contact 225 matched with the fixed contact 221 is arranged on the movable contact plate 224; the second test contact T2 is matched with the contact support 223 of the movable contact 222, and the contact support 223 drives the movable contact 225 to be separated from the fixed contact 221 when the circuit breaker is opened, and drives the second elastic element 52 to be separated from the intermediate connecting element 53; the contact supporter 223 drives the moving contact 225 to contact with the fixed contact 221 when the circuit breaker is closed, and simultaneously moves away from the second elastic member 52 to reset the second elastic member 52. Of course, the second test contact T2 may also be engaged with the handle 21 or the operating mechanism 23 or the movable contact plate 224 of the contact system, which falls within the scope of the present invention.

As shown in fig. 1-3, the utility model discloses a circuit breaker includes a plurality of circuit breaker units that set up side by side, a plurality of circuit breaker units include contact system respectively, and at least one circuit breaker unit includes earth leakage protection mechanism, the first elastic component 51 and the second elastic component 52 of earth leakage test mechanism set up respectively in the circuit breaker unit of two differences, and first elastic component 51 and second elastic component 52 are connected with the contact system of two circuit breaker units respectively, shell assembly passes from casing assembly at the middle part of the intermediate junction spare 53 of earth leakage test mechanism, the both ends of the intermediate junction spare 53 of earth leakage test mechanism are stretched to respectively in the circuit breaker unit that corresponds with first elastic component 51 and second elastic component 52. The first elastic member 51 and the second elastic member 52 of the present embodiment are respectively connected to the contact systems of the two circuit breaker units, and when the first elastic member 51 and the second elastic member 52 are respectively in contact with both ends of the intermediate connection member 53, a path can be formed between the two lines and a leakage fault signal can be simulated, which has a characteristic of simple structure.

As shown in fig. 6 and 9, the contact system includes a handle 21, a contact mechanism, an operating mechanism 23, a wiring mechanism, a short-circuit protection mechanism 24 and an overload protection mechanism 25, the wiring mechanism includes a left wiring terminal 261 and a right wiring terminal 262 respectively disposed at two ends of the circuit breaker unit, the left wiring terminal 261 is connected to the stationary contact 221 via the short-circuit protection mechanism 24, and the right wiring terminal 262 is connected to the movable contact plate 224 of the movable contact 222 via the overload protection mechanism 25; the second wire 242 connected between the left connection terminal 261 of each breaker unit and the short-circuit protection mechanism 24 passes through the zero-sequence current transformer 41; one end of the second elastic member 52 not engaged with the intermediate connecting member 53 is connected to the second wire 242 of the circuit breaker unit provided with the second elastic member 52; the first elastic member 51 is connected to a right connection terminal 262 of the circuit breaker unit provided with the first elastic member 51 through a test resistor 54. Preferably, an elastic piece 524 is disposed in the housing assembly, and the second elastic element 52 is connected to the second wire 242 through the elastic piece 524. The second elastic member 52 is clipped on the elastic piece 524, and the other end of the elastic piece 524 is connected to the second wire 242 through the test wire 525.

As shown in fig. 6-10, the circuit breaker of the present invention includes two circuit breaker units disposed side by side, the two circuit breaker units are an earth leakage protection unit a and a circuit breaker protection unit B, the contact systems of the earth leakage protection unit a and the circuit breaker protection unit B both pass through the zero sequence current transformer 41 of the earth leakage test mechanism, the earth leakage protection mechanism, the first elastic member 51 of the earth leakage test mechanism and the earth leakage test button 50 of the earth leakage test mechanism are disposed in the earth leakage protection unit a, the second elastic member 52 of the earth leakage test mechanism is disposed in the circuit breaker protection unit B and cooperates with the operating mechanism 23 of the circuit breaker protection unit B, the housing assembly is provided with an intermediate partition 11 between the earth leakage protection unit a and the circuit breaker protection unit B, the middle portion of the intermediate connection member 53 of the earth leakage test mechanism passes through the intermediate partition 11, one end of the intermediate connector 53 extends into the earth leakage protection unit a to be engaged with the first elastic member 51, and the other end of the intermediate connector 53 extends into the breaker protection unit B to be engaged with the second elastic member 52. Usually, the first elastic member 51 and the second elastic member 52 of two breakpoints of the leakage test mechanism are both arranged in the leakage protection unit a, but the newly-added breakpoints are linked with the operating mechanism of the leakage protection unit a, so that certain risks exist, because the manual disconnection of the main current loop only needs to open the handle of the breaker protection unit B, and at the moment, the leakage protection unit a is not opened, so that the second test contact T2 still keeps closed.

As shown in fig. 5 and 8, the contact system of the earth leakage protection unit a and the contact system of the circuit breaker protection unit B in this embodiment have the same structure, and the contact systems of the earth leakage protection unit a and the circuit breaker protection unit B respectively include a handle 21, a contact mechanism, an operating mechanism 23, a wiring mechanism, a short-circuit protection mechanism 24, and an overload protection mechanism 25;

the contact mechanism comprises a fixed contact 221 and a movable contact 222 which are arranged oppositely, the movable contact 222 comprises a contact support 223 which is pivotally arranged in the shell assembly and matched with the operating mechanism 23, and a movable contact plate 224 which is arranged on the contact support 223, a movable contact 225 which is matched with the fixed contact 221 is arranged on the movable contact plate 224, the wiring mechanism comprises a left wiring terminal 261 and a right wiring terminal 262 which are respectively arranged at two ends of the breaker unit, the left wiring terminal 261 is connected with the fixed contact 221 through a short-circuit protection mechanism 24, and the right wiring terminal 262 is connected with the movable contact plate 224 of the movable contact 222 through an overload protection mechanism 25;

second wire 242 of connection between left binding post 261 of circuit breaker protection unit B and short-circuit protection mechanism 24 to and the first wire 241 of connection between left binding post 261 of earth leakage protection unit A and short-circuit protection mechanism 24 all pass zero sequence current transformer 41, the second elastic component 52 of electric leakage test return circuit is connected with the second wire 242 of connection between left binding post 261 of circuit breaker protection unit B and short-circuit protection mechanism 24, and first elastic component 51 of electric leakage test return circuit is connected with right binding post 262 of earth leakage protection unit A through test resistance 54.

As shown in fig. 10, the leakage protection mechanism includes a zero sequence current transformer 41, a leakage operating mechanism 42, a leakage release 43, a circuit board 44 and a leakage handle 45, the leakage operating mechanism 42 is similar to the operating mechanism 23 of the contact system in working principle, and the leakage handle 45 is connected with the handle 21 of the circuit breaker unit, but the leakage operating mechanism 42 is not connected with the movable contact 222;

the operating mechanism 23 and the leakage operating mechanism 42 respectively comprise a rocker arm which is pivotally arranged in the shell assembly, an energy storage part connected with the rocker arm, and a jump buckle and a lock catch which are respectively pivotally arranged on the rocker arm, the jump buckle and the lock catch are mutually matched in a hasp manner, and an unlocking rod 10 is arranged between the operating mechanism 23 and the leakage operating mechanism 42;

the handle 21 is connected with the leakage handle 45, and the handle 21 and the leakage handle 45 can respectively compress respective energy storage pieces and drive respective jump buckles to be locked with the buckle buckles when rotating;

the short-circuit protection mechanism 24 and the overload protection mechanism 25 respectively unlock the trip and the lock of the operating mechanism 23 when the short circuit and the overload occur on the circuit, the leakage operating mechanism 42 is unlocked by the leakage protecting mechanism when the leakage occurs on the circuit, the trip and the lock of the operating mechanism 23 are driven to unlock by the unlocking rod 10 when the trip and the lock of the leakage operating mechanism 42 are unlocked, and the trip and the lock of the operating mechanism 23 are unlocked by the unlocking rod 10.

When a plurality of circuit breaker units are arranged, the tripping and locking of the leakage operating mechanism 42 are unlocked, the tripping and locking of the operating mechanisms 23 of all the circuit breaker units are driven by the unlocking rod 10, and when the tripping and locking of the operating mechanism 23 of any circuit breaker unit are unlocked, the tripping and locking of the operating mechanisms 23 of other circuit breaker units and the tripping and locking of the leakage operating mechanism 42 are driven by the unlocking rod 10 to unlock all the circuits.

As shown in fig. 6-7, the housing assembly is provided with a middle partition 11 between the circuit breaker protection unit B and the earth leakage protection unit a, the middle partition 11 is provided with a protrusion 111 at a side close to the earth leakage protection unit a, and a space for accommodating the short-circuit protection mechanism 24 of the contact system in the circuit breaker protection unit B is formed at a side of the protrusion 111 close to the circuit breaker protection unit B;

the end of the intermediate connecting member 53 engaged with the second elastic member 52 is disposed above the short-circuit protection mechanism 24 in the circuit breaker protection unit B, and the end of the intermediate connecting member 53 engaged with the first elastic member 51 extends through the intermediate partition 11 to the top side of the protrusion structure 111. The end of the middle connecting piece 53, which is engaged with the first elastic piece 51, extends to the top side of the protruding structure 111 for engagement, and when the first elastic piece 51 is contacted with the middle connecting piece 53, the top side of the protruding structure 111 provides support for the middle connecting piece 53, so as to avoid deforming the middle connecting piece 53. Preferably, the length of the middle connection member 53 is increased, so that the end of the middle connection member 53, which is engaged with the first elastic member 51, extends out of the protrusion structure 111 and is suspended.

As shown in fig. 3-5 and 8, the specific structure of the intermediate connecting member 53 is shown, the intermediate connecting member 53 is of a zigzag structure, the intermediate connecting member 53 includes a connecting plate 533 and a first contact plate 531 and a second contact plate 532 respectively connected to two ends of the connecting plate 533, the connecting plate 533 and the second contact plate 532 are disposed on one side of the intermediate partition plate 11 close to the circuit breaker protection unit B, the intermediate partition plate 11 is provided with an avoiding hole avoiding the first contact plate 531, the intermediate partition plate 11 is provided with a limiting groove 112 for limiting the intermediate connecting member 53, and a side edge of the connecting plate 533 is provided with a limiting plate 534 protruding outward and matching with the limiting groove 112 in a limiting manner.

Further, a limiting rib 113 which is in limiting fit with the side surface of the limiting plate 534 is arranged in the limiting groove 112.

As shown in fig. 3-5 and 8, the second elastic member 52 includes a second spiral part 521 pivotally mounted on the housing assembly, and a second contact arm 522 and a second connection arm 523 respectively disposed at two ends of the second spiral part 521, the second spiral part 521 of the second elastic member 52 and the contact support 223 of the movable contact 222 are disposed at two sides of the middle connection part 53, a middle portion of the second contact arm 522 passes through the lower portion of the middle connection part 53 and then is engaged with the contact support 223, the contact support 223 pushes the second contact arm 522 to be separated from the middle connection part 53 to disconnect the second test contact T2 when driving the movable contact 225 to be separated from the fixed contact 221, and the contact support 223 resets the second contact arm 522 to be contacted with the middle connection part 53 to close the second test contact T2 when driving the movable contact 225 to be contacted with the fixed contact 221.

Further, the second contact arm 522 is in a U-shaped structure, the contact support 223 is provided with a contact boss 226, one end of the intermediate connecting member 53 is located inside the second contact arm 522, one end of the second contact arm 522 is connected to the second spiral portion 521, and the other end of the second contact arm 522 is provided with a second pushing arm 227 which is engaged with the contact boss 226.

Referring to fig. 6, when the contact support 223 drives the moving contact 225 to separate from the fixed contact 221, the contact support 223 rotates counterclockwise to drive the moving contact 225 to move rightward, and meanwhile, the contact boss 226 moves downward to push the second contact arm 522 to separate from the middle contact 53; when the contact support 223 drives the moving contact 225 to contact with the fixed contact 221, the contact support 223 rotates clockwise to drive the moving contact 225 to move leftward, meanwhile, the contact boss 226 moves upward to avoid the second contact arm 522, and the second contact arm 522 contacts with the middle contact member 53 under the action of the elastic force of the second contact arm 522. Of course, the second contact arm 522 may also be disposed between the intermediate connecting member 53 and the contact support 223, and when the contact support 223 drives the moving contact 225 to contact with the fixed contact 221, the contact boss 226 pushes the second contact arm 522 to contact with the intermediate connecting member 53, which all belong to the protection scope of the present invention.

Further, the second connecting arm 523 is connected to one end of the elastic piece 524, the other end of the elastic piece 524 is connected to the second conducting wire 242 penetrating through the zero sequence current transformer 41 through the testing conducting wire 525, one end of the elastic piece 524 is provided with a clamping groove 5230 in limit fit with the second connecting arm 523, and the other end of the elastic piece 524 is provided with a lower extension piece 5250 connected to the testing conducting wire 525.

Further, the second spiral part 521 is provided above the side of the intermediate link 53 away from the contact support 223, the elastic piece 524 is disposed at one side of the handle 21, above the short-circuit protection mechanism 24, the elastic piece 524 includes a longitudinal piece 5241 and a transverse piece 5242 connected at one end, and an inclined piece 5243 connected to the other end of the lateral piece 5242, the longitudinal piece 5241 being disposed on the horizontal side of the second screw part 521, a clamping groove 5230 which is in limit fit with the second connecting arm 523 is arranged on the side edge of the longitudinal piece 5241, one end of the transverse piece 5242 is connected with the bottom end of the longitudinal piece 5241, the other end of the transverse piece 5242 is connected with the top end of an inclined piece 5243 which is obliquely arranged, the bottom end of the inclined piece 5243 extends to the upper part of the short-circuit protection mechanism 24 of the circuit breaker protection unit B, a lower extension piece 5250 connected to a test wire 525 is provided on the inclined piece 5243, and the test wire 525 extends from the side of the short-circuit protection mechanism 24 of the breaker protection unit B to one end of the short-circuit protection mechanism 24 through.

As shown in fig. 3-5 and 10, the first elastic member 51 has a specific structure, the first elastic member 51 includes a first spiral part 511 pivotally mounted on the housing assembly, and a first contact arm 512 and a first connecting arm 513 respectively disposed at two ends of the first spiral part 511, the first contact arm 512 extends between the middle connecting part 53 and the earth leakage test button 50, and the first connecting arm 513 is connected to the right connection terminal 262 of the earth leakage protection unit a through the test resistor 54; the first screw portion 511 is disposed under the leakage test button 50, the first contact arm 512 has a zigzag structure, the first contact arm 512 includes a lower arm 5121 and an upper arm 5123, and a vertical arm 5122 connected between the lower horizontal arm 5121 and one end of the upper horizontal arm 5123, wherein one end of the lower horizontal arm 5121 is connected with the first spiral part 511, one end of the lower horizontal arm 5121 connected with the vertical arm 5122 is inclined upwards and then matched with the bottom of the leakage test button 50, the vertical arm 5122 extends upwards from the middle connecting piece 53 and then is connected with one end of the upper horizontal arm 5123, the other end of the upper horizontal arm 5123 extends towards the direction close to the middle connecting piece 53 and then is connected with the bending arm 5114, the bending arm 5114 is positioned above one end of the middle connecting piece 53, the bending arm 5114 bends towards one side far away from the middle connecting piece 53, and the leakage test button 50 can push the lower horizontal arm 5121 to drive the curved surface on the outer side of the bending arm 5114 to be contacted.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. A circuit breaker, characterized by: the circuit breaker comprises a shell assembly, and a contact system, a leakage protection mechanism and a leakage test mechanism which are arranged in the shell assembly, wherein the contact system comprises a handle (21), a contact mechanism and an operating mechanism (23), the circuit breaker drives the operating mechanism (23) to close or open the contact mechanism through the handle (21), the leakage test mechanism comprises a leakage test button (50) and a leakage test loop, the leakage test loop comprises a first test contact (T1) matched with the leakage test button (50) and a second test contact (T2) matched with the contact system, and the contact system drives the second test contact (T2) to be opened when the circuit breaker is opened; the contact system avoids the second test contact (T2) when the breaker is switched on, the second test contact (T2) is reset and kept closed, the test button (50) is used for driving the first test contact (T1) to be closed, and when the first test contact (T1) and the second test contact (T2) are both closed, the leakage test loop is conducted.

2. The circuit breaker of claim 1, wherein: the electric leakage test circuit comprises a middle connecting piece (53), a first elastic piece (51) and a second elastic piece (52) which are respectively matched with the two ends of the middle connecting piece, wherein a first test contact (T1) which forms the electric leakage test circuit is arranged at one end of the first elastic piece (51) and one end of the middle connecting piece (53) at intervals, and the first test contact (T1) can be closed by driving the first elastic piece (51) to be contacted with the middle connecting piece (53) by pressing an electric leakage test button (50); the second elastic piece (52) is in contact fit with the other end of the intermediate connecting piece (53) to form a second testing contact (T2) of the electric leakage testing loop, the contact system is not in contact with the second testing contact (T2) when the circuit breaker is switched on so that the second testing contact (T2) is kept closed, and the contact system drives the second elastic piece (52) to be separated from the intermediate connecting piece (53) when the circuit breaker is switched off so that the second testing contact (T2) is disconnected.

3. The circuit breaker of claim 2, wherein: the contact mechanism comprises a fixed contact (221) and a movable contact (222) which are respectively connected with a line; the operating mechanism (23) can drive the static contact (221) to be in contact with and separate from the moving contact (222); the moving contact (222) comprises a contact support (223) which is pivotally arranged in the shell component and is matched with the operating mechanism (23), and a moving contact plate (224) arranged on the contact support (223), wherein a moving contact (225) matched with the fixed contact (221) is arranged on the moving contact plate (224); the second test contact (T2) is matched with a contact support (223) of the movable contact (222), and the contact support (223) drives the movable contact (225) to be separated from the fixed contact (221) when the breaker is opened, and simultaneously drives the second elastic piece (52) to be separated from the middle connecting piece (53); the contact support (223) drives the movable contact (225) to be in contact with the fixed contact (221) when the circuit breaker is closed, and meanwhile, the second elastic piece (52) is reset by being far away from the second elastic piece (52).

4. The circuit breaker of claim 2, wherein: including a plurality of circuit breaker units that set up side by side, a plurality of circuit breaker units include contact system respectively, and at least one circuit breaker unit includes earth leakage protection mechanism, first elastic component (51) and second elastic component (52) of earth leakage test mechanism set up respectively in two different circuit breaker units, and first elastic component (51) and second elastic component (52) are connected with the contact system of two circuit breaker units respectively, the middle part of middle connecting piece (53) of earth leakage mechanism passes from housing assembly, the both ends of middle connecting piece (53) of earth leakage test mechanism stretch to respectively in the circuit breaker unit who corresponds with first elastic component (51) and second elastic component (52).

5. The circuit breaker of claim 4, wherein: the contact system comprises a handle (21), a contact mechanism, an operating mechanism (23), a wiring mechanism, a short-circuit protection mechanism (24) and an overload protection mechanism (25), wherein the wiring mechanism comprises a left wiring terminal (261) and a right wiring terminal (262) which are respectively arranged at two ends of a circuit breaker unit, the left wiring terminal (261) is connected with a static contact (221) through the short-circuit protection mechanism (24), and the right wiring terminal (262) is connected with a movable contact plate (224) of a movable contact (222) through the overload protection mechanism (25); a second conductor (242) connected between the left connection terminal (261) of each breaker unit and the short-circuit protection mechanism (24) passes through the zero-sequence current transformer (41); one end of the second elastic piece (52), which is not matched with the middle connecting piece (53), is connected with a second lead (242) of the breaker unit provided with the second elastic piece (52); the first elastic member (51) is connected to a right connection terminal (262) of the circuit breaker unit provided with the first elastic member (51) through a test resistor (54).

6. The circuit breaker of claim 2, wherein: the second elastic member (52) includes a second spiral part (521) pivotally mounted on the housing assembly, and a second contact arm (522) and a second connection arm (523) which are respectively arranged at two ends of the second spiral part (521), the second spiral part (521) of the second elastic part (52) and a contact support (223) of the movable contact (222) are oppositely arranged at two sides of the middle connecting part (53), the middle part of the second contact arm (522) penetrates through the lower part of the middle connecting part (53) and then is matched with the contact support (223), the contact support (223) pushes the second contact arm (522) to be separated from the middle connecting part (53) to disconnect the second test contact (T2) when driving the movable contact (225) to be separated from the fixed contact (221), and the contact support (223) drives the movable contact (225) to be contacted with the fixed contact (221) to reset the second contact arm (522) and contact with the middle connecting part (53) to close the second test contact (T2).

7. The circuit breaker of claim 6, wherein: the second contact arm (522) is of a U-shaped structure, a contact boss (226) is arranged on the contact support (223), one end of the middle connecting piece (53) is located on the inner side of the second contact arm (522), one end of the second contact arm (522) is connected with the second spiral part (521), and the other end of the second contact arm (522) is provided with a second pushing arm (227) matched with the contact boss (226).

8. The circuit breaker of claim 6, wherein: be equipped with conducting strip (524) in the casing subassembly, second elastic component (52) clamp on conducting strip (524), the one end of conducting strip (524) be equipped with spacing complex draw-in groove (5230) of second linking arm (523), the other end of conducting strip (524) is equipped with lower extension piece (5250) that are used for the wiring.

9. The circuit breaker of claim 8, wherein: the contact system further comprises a short-circuit protection mechanism (24), the second spiral part (521) is arranged above one side, far away from the contact support (223), of the middle connecting piece (53), the conducting strip (524) is arranged on one side of the handle (21) and located above the short-circuit protection mechanism (24), the conducting strip (524) comprises a longitudinal piece (5241) and a transverse piece (5242) which are connected at one end and an oblique piece (5243) which is connected with the other end of the transverse piece (5242), the longitudinal piece (5241) is arranged on one horizontal side of the second spiral part (521), a clamping groove (5230) which is in limit fit with the second connecting arm (523) is arranged on the side edge of the longitudinal piece (5241), one end of the transverse piece (5242) is connected with the bottom end of the longitudinal piece (5241), the other end of the transverse piece (5242) is connected with the top end of the oblique piece (5243) which is obliquely arranged, and the bottom end of the oblique piece (5243) extends to the upper part of the short-circuit, the inclined piece (5243) is provided with a lower extension piece (5250).

10. The circuit breaker of claim 2, wherein: comprises an electric leakage protection unit (A) and a circuit breaker protection unit (B) which are arranged side by side, an electric leakage testing mechanism is arranged between the electric leakage protection unit (A) and the circuit breaker protection unit (B), the electric leakage protection unit (A) and the circuit breaker protection unit (B) respectively comprise a contact system, the contact systems of the electric leakage protection unit (A) and the circuit breaker protection unit (B) respectively pass through a zero sequence current transformer (41) of the electric leakage testing mechanism, the electric leakage protection mechanism, a first elastic piece (51) of the electric leakage testing mechanism and an electric leakage testing button (50) of the electric leakage testing mechanism are arranged in the electric leakage protection unit (A), a second elastic piece (52) of the electric leakage testing mechanism is arranged in the circuit breaker protection unit (B) and is matched with an operating mechanism (23) of the circuit breaker protection unit (B), a middle partition plate (11) is arranged between the electric leakage protection unit (A) and the circuit breaker protection unit (B) corresponding to a shell assembly, an intermediate connecting piece (53) of the leakage test mechanism penetrates through the middle partition plate (11), one end of the intermediate connecting piece (53) extends into the leakage protection unit (A) to be matched with the first elastic piece (51), and the other end of the intermediate connecting piece (53) extends into the circuit breaker protection unit (B) to be matched with the second elastic piece (52).

11. The circuit breaker of claim 10, wherein: the contact system of the leakage protection unit (A) is the same as that of the circuit breaker protection unit (B) in structure, and the contact systems of the leakage protection unit (A) and the circuit breaker protection unit (B) respectively comprise a handle (21), a contact mechanism, an operating mechanism (23), a wiring mechanism, a short-circuit protection mechanism (24) and an overload protection mechanism (25); the contact mechanism comprises a fixed contact (221) and a movable contact (222) which are arranged oppositely, the movable contact (222) comprises a contact support (223) which is pivotally arranged in the shell assembly and matched with the operating mechanism (23), and a movable contact plate (224) which is arranged on the contact support (223), a movable contact (225) which is matched with the fixed contact (221) is arranged on the movable contact plate (224), the wiring mechanism comprises a left wiring terminal (261) and a right wiring terminal (262) which are respectively arranged at two ends of the breaker unit, the left wiring terminal (261) is connected with the fixed contact (221) through a short-circuit protection mechanism (24), and the right wiring terminal (262) is connected with the movable contact (224) of the movable contact (222) through an overload protection mechanism (25); second wire (242) of connection between left binding post (261) of circuit breaker protection unit (B) and short-circuit protection mechanism (24) pass zero sequence current transformer (41), second elastic component (52) of electric leakage test return circuit are connected with second wire (242) of connection between left binding post (261) of circuit breaker protection unit (B) and short-circuit protection mechanism (24), and first elastic component (51) of electric leakage test return circuit are connected with right binding post (262) of electric leakage protection unit (A) through test resistance (54).

12. The circuit breaker of claim 10, wherein: the shell assembly is provided with a middle partition plate (11) between the circuit breaker protection unit (B) and the electric leakage protection unit (A), the middle partition plate (11) is provided with a convex structure (111) at one side close to the electric leakage protection unit (A), and a space for accommodating a short-circuit protection mechanism (24) of a contact system in the circuit breaker protection unit (B) is formed at one side of the convex structure (111) close to the circuit breaker protection unit (B); one end of the middle connecting piece (53) matched with the second elastic piece (52) is arranged above the short-circuit protection mechanism (24) in the circuit breaker protection unit (B), and one end of the middle connecting piece (53) matched with the first elastic piece (51) penetrates through the middle partition plate (11) to extend to the top side of the protruding structure (111) to be matched.

13. The circuit breaker of claim 12, wherein: intermediate junction spare (53) are the zigzag structure, intermediate junction spare (53) include connecting plate (533) and respectively with first contact board (531) and second contact board (532) that connecting plate (533) both ends are connected, connecting plate (533) and second contact board (532) set up the one side that is close to circuit breaker protection unit (B) at intermediate bottom (11), be equipped with the hole of dodging first contact board (531) on intermediate bottom (11), and be equipped with spacing groove (112) that are used for fixed intermediate junction spare (53) on intermediate bottom (11), the side of connecting plate (533) is equipped with outside protruding and spacing groove (112) spacing complex limiting plate (534), be equipped with in spacing groove (112) with spacing rib (113) of limiting plate (534) side spacing complex.

14. The circuit breaker of claim 10, wherein: the first elastic piece (51) comprises a first spiral part (511) which is pivotally installed on the shell assembly, and a first contact arm (512) and a first connecting arm (513) which are respectively arranged at two ends of the first spiral part (511), wherein the first contact arm (512) extends to a position between the middle connecting piece (53) and the electric leakage test button (50), and the first connecting arm (513) is connected with a right connecting terminal (262) of the electric leakage protection unit (A) through a test resistor (54).

15. The circuit breaker of claim 14, wherein: the first spiral part (511) is arranged below the leakage test button (50), the first contact arm (512) is of a Z-shaped structure, the first contact arm (512) comprises a lower cross arm (5121), an upper cross arm (5123) and a longitudinal arm (5122) connected between the lower cross arm (5121) and one end of the upper cross arm (5123), one end of the lower cross arm (5121) is connected with the first spiral part (511), one end, connected with the longitudinal arm (5122), of the lower cross arm (5121) is inclined upwards and then matched with the bottom of the leakage test button (50), the longitudinal arm (5122) extends towards the upper part of the middle connecting piece (53) and then is connected with one end of the upper cross arm (5123), the other end of the upper cross arm (5123) extends towards the middle connecting piece (53) and then is connected with the bending arm (5114), the bending arm (5114) is positioned above one end of the middle connecting piece (53) and the bending arm (5114) bends towards the side far away from the middle connecting piece (53), the leakage test button (50) can push the lower cross arm (5121) to drive the curved surface on the outer side of the bending arm (5114) to be in contact with one end of the middle connecting piece (53).