CN217606032U - Leakage test circuit of circuit breaker and circuit breaker - Google Patents

Abstract

The utility model relates to the field of low-voltage electricity, in particular to a leakage test circuit of a circuit breaker, which comprises a matching conductive structure, a switch elastic member and an intermediate conductive structure sequentially connected in series between a phase-pole circuit and an N-pole circuit of the circuit breaker, and The test button; the middle conductive structure is a moving contact spring; the cooperating conductive structure includes a cooperating arm, and the switch elastic part includes a switching arm and a contact arm; when the circuit breaker is in the closed state, the contact arm and the cooperating arm are in contact and electrically connected, and the circuit breaker switches to In the open state, the operating mechanism of the circuit breaker drives the contact arm to disconnect from the matching arm; the switch arm and the intermediate conductive structure remain in a normally open state, and when the circuit breaker is in the closed state, press the test button to drive the switch arm to contact the intermediate conductive structure Conduction; the leakage test circuit has simple structure, reliable action and good safety. The utility model also relates to a circuit breaker including the leakage test circuit, which has simple internal structure, good safety and can perform leakage simulation test.

Description

Circuit breaker leakage test circuit and circuit breaker

technical field

The utility model relates to the low-voltage electrical field, in particular to a leakage test circuit of a circuit breaker and a circuit breaker including the leakage test circuit.

Background technique

During the normal use of the residual current circuit breaker, it is required to perform a leakage simulation test operation at regular intervals. After pressing the test button, the product can simulate the leakage action and cut off the circuit to ensure the normal use of the leakage protection function of the product; For the above functions of the current-operated circuit breaker, it is necessary to set up a leakage test circuit in the circuit breaker.

Utility model content

The purpose of the utility model is to overcome the defects of the prior art, and to provide a leakage test circuit of a circuit breaker, which is simple in structure, reliable in operation and good in safety; and also provides a circuit breaker including the leakage test circuit, which has an internal leakage test circuit. The structure is simple, the safety is good, and the leakage simulation test can be carried out.

To achieve the above object, the utility model adopts the following technical solutions:

A leakage test circuit of a circuit breaker, the leakage test circuit comprises a matching conductive structure, a switch elastic member, an intermediate conductive structure, and a test button, which are sequentially connected in series between a phase-pole circuit and an N-pole circuit of the circuit breaker; The conductive structure is a movable contact spring that provides overtravel force to the movable contact of the circuit breaker and is in contact with the movable contact; the cooperating conductive structure includes a cooperating arm, and the switch elastic member includes a switching arm and a contact arm;

When the circuit breaker is in the closed state, the contact arm and the matching arm are in contact and electrically connected, and when the circuit breaker is switched to the open state, the operating mechanism of the circuit breaker drives the contact arm to disconnect from the matching arm;

The switch arm and the intermediate conductive structure are kept in a normally open state, and when the circuit breaker is in a closed state, the test button is pressed to drive the switch arm to be in contact with the intermediate conductive structure.

Preferably, the operating mechanism includes a rotatably arranged lever, and the movable contact is rotatably arranged on the lever; the movable contact spring is a torsion spring, which is arranged coaxially with the movable contact, and one end of the torsion spring is in contact with the movable contact, The other end mates with the switch arm.

Preferably, the switch elastic member is a switch torsion spring, the two ends of the switch torsion spring are a switch arm and a contact arm respectively, and the switch arm comprises a first section of the switch arm, a second section of the switch arm, and the first section of the switch arm that are connected in sequence by bending The third section and the fourth section of the switch arm, the two ends of the fourth section of the switch arm are respectively connected with the switch torsion coil and the third section of the switch arm, the first section of the switch arm is matched with the middle conductive structure, and the third section of the switch arm is matched with the test button .

Preferably, the switch elastic member is a switch torsion spring, the two ends of the switch torsion spring are a switch arm and a contact arm respectively, and the contact arm includes a first section of the contact arm, a second section of the contact arm, and a first section of the contact arm that are connected in sequence. Three sections, both ends of the third section of the contact arm are respectively connected with the second section of the contact arm and the switch torsion coil, and the first section of the contact arm is driven and matched with the operating mechanism.

Preferably, when the circuit breaker is switched from the closed state to the open state, the lever of the operating mechanism drives the movable contact and the stationary contact to disconnect, and simultaneously the driven contact arm and the matching arm are disconnected.

Preferably, the operating mechanism includes a handle, a second link, a third link, a jumper, a lock and a lever. The jumper is provided with a waist-shaped hole of the jumper, one end of the second link is rotatably connected to the handle, the other end is rotatably connected to one end of the third link, and is inserted into the waist-shaped hole of the jumper, and the third link is rotatably connected to one end of the third link. The other end of the rod is connected to the lever rotation, one end of the jumping fastener is set in rotation, and the other end is engaged with the locking fastener. . When the third connecting rod driving lever rotates to realize the opening or closing operation, one end of the second connecting rod and the third connecting rod inserted into the waist-shaped hole of the jumper moves along the waist-shaped hole of the jumper.

Preferably, the cooperating conductive structure is a torsion spring, the torsion spring is a cooperating torsion spring, the cooperating torsion spring includes a cooperating torsion spring coil, one of the two ends of the cooperating torsion spring connected to the cooperating torsion spring coil is fixedly arranged, and the other is a cooperating torsion spring. for the cooperating arm.

Preferably, the matching arm includes a first section of the matching arm and a second section of the matching arm, both ends of the second section of the matching arm are respectively connected with the matching torsion spring coil and the first section of the matching arm, and the first section of the matching arm is connected to the contact arm. The first segment of the contact arm is mated and the first segment of the engagement arm is spatially intersected with the first segment of the contact arm.

Preferably, the leakage test circuit further includes a current limiting resistor and a zero-sequence current induction coil, the current limiting resistor is connected in series between the matching conductive structure and the N-pole terminal of the circuit breaker, and the zero-sequence current induction coil is connected in series between the intermediate conductive structure and the N-pole terminal of the circuit breaker. Between the phase-pole terminals of the circuit breaker, the N-pole terminal and the phase-pole terminal are the same as the incoming terminal or outgoing terminal.

Preferably, the leakage test circuit is located on one side of the operating mechanism as a whole, the switch elastic member is a switch torsion spring, and the axes of the switch torsion spring and the matching torsion spring are arranged in parallel and spaced apart and side by side along the thickness direction of the circuit breaker.

A circuit breaker includes the leakage test circuit.

Preferably, the circuit breaker further includes a housing and a partition, and the operating mechanism, the leakage test circuit and the partition are all arranged in the housing; the switch elastic member and the matching conductive structure are respectively arranged on both sides of the partition, and the switch elastic member In order to switch the torsion spring, the switch torsion spring is sleeved on the torsion spring shaft of the partition plate.

The leakage test circuit of the circuit breaker of the utility model has a simple structure, adopts a mechanical transmission mode, and has reliable action; and when the circuit breaker is in an open state, two circuits are formed between the contact arm and the matching arm, and between the switch arm and the middle conductive structure. It has higher safety and greatly reduces the possibility of conduction of the leakage test circuit under unexpected conditions (such as operator's misoperation, etc.); and the intermediate conductive structure is realized by the moving contact spring, which can The contact spring also plays the function of installing the moving contact to realize overtravel and an electrical breakpoint of the leakage test circuit, which is beneficial to simplify the structure of the leakage test circuit and reduce the number of parts of the circuit breaker.

The circuit breaker of the utility model includes the leakage test circuit, the internal structure is simple, and the leakage simulation test can be performed.

Description of drawings

1 is a schematic view of the projected structure of the circuit breaker of the present invention in an open state;

Fig. 2 is the three-dimensional structure schematic diagram of the circuit breaker of the present utility model in the open state;

3 is a schematic view of the projected structure of the leakage test circuit of the circuit breaker of the present utility model in an open state, the contact arm is disconnected from the matching arm, and the switch arm is disconnected from the intermediate conductive structure;

Fig. 4 is the enlarged structural representation of part A of Fig. 3 of the present utility model;

5 is a schematic three-dimensional structure diagram of the leakage test circuit of the circuit breaker of the present invention in an open state, the contact arm is disconnected from the matching arm, and the switch arm is disconnected from the intermediate conductive structure;

Fig. 6 is the enlarged structural representation of B part of Fig. 5 of the present utility model;

Figure 7 is a schematic view of the projected structure of the circuit breaker of the present invention in a closed state, and the test button of the leakage test circuit is not pressed;

8 is a schematic diagram of the projected structure of the leakage test circuit of the circuit breaker of the present invention in the closed state, the test button is not pressed, the contact arm and the matching arm are in contact and conduct, and the switch arm is disconnected from the intermediate conductive structure;

Fig. 9 is the enlarged structural representation of the C part of Fig. 8 of the present utility model;

10 is a three-dimensional schematic diagram of the leakage test circuit of the circuit breaker of the present utility model in the closed state, the test button is not pressed, the contact arm and the matching arm are in contact and conduct, and the switch arm is disconnected from the middle conductive structure;

Fig. 11 is the enlarged structural schematic diagram of part D of Fig. 10 of the present utility model;

12 is a schematic view of the projected structure of the circuit breaker of the present invention in a closed state, and the test button of the leakage test circuit is pressed;

13 is a three-dimensional schematic diagram of the circuit breaker of the present utility model in the closed state, and the test button of the leakage test circuit is pressed;

14 is a schematic view of the projected structure of the leakage test circuit of the circuit breaker of the present invention in the closed state, the test button is pressed, the contact arm and the matching arm are in contact and conduction, and the switch arm and the intermediate conductive structure are in contact and conduction;

Fig. 15 is the enlarged structural schematic diagram of the E part of Fig. 14 of the present utility model;

16 is a schematic three-dimensional structure diagram of the leakage test circuit of the circuit breaker of the present invention in the closed state, the test button is pressed, the contact arm and the matching arm are in contact and conduction, and the switch arm and the middle conductive structure are in contact and conduction;

Fig. 17 is the enlarged structural schematic diagram of the F part of Fig. 16 of the present utility model;

Fig. 18 is the structural representation of the test button of the present utility model;

Fig. 19 is the structural representation of the intermediate conductive structure of the present utility model;

Fig. 20 is the structural schematic diagram of the switch elastic member of the present invention;

FIG. 21 is a schematic structural diagram of the matching conductive structure of the present invention.

Detailed ways

The specific embodiments of the circuit breaker of the present invention will be further described below with reference to the embodiments given in the accompanying drawings 1-21. The circuit breaker of the present invention is not limited to the description of the following embodiments.

As shown in Figures 1, 2, 7, and 13, the circuit breaker of the present invention includes a housing h0, an operating mechanism and a contact system arranged in the housing h0, and the contact system includes a movable contact 1 and a static contact that are used together. The operating mechanism is drivingly connected with the moving contact 1 to drive the moving contact 1 to be closed or disconnected from the static contact, so as to close or open the circuit breaker. Further, the circuit breaker of the present invention includes an N-pole circuit and at least one phase-pole circuit, the N-pole circuit is electrically connected to the neutral line of the power supply, the phase-pole circuit is electrically connected to the phase line of the power supply, and both the N-pole circuit and the phase-pole circuit are electrically connected. There is a contact system, or only a contact system is set in the phase-pole circuit and the N-pole circuit is a through-pole circuit (that is, no breakpoint is set in the N-pole circuit). Mechanism drive is connected.

As shown in Figure 1-17, the circuit breaker further includes a leakage test circuit arranged in the casing h0, and the leakage test circuit includes a matching conductive structure 3, The switch elastic member 4, the intermediate conductive structure 2, and the test button 5; the intermediate conductive structure 2 is a movable contact spring that provides an overtravel force to the movable contact 1 of the circuit breaker and is in contact with the movable contact 1; The matching conductive structure 3 includes matching arms 31-32, and the switch elastic member 4 includes a switching arm 41 and a contact arm 42; when the circuit breaker is in the closed state, the contact arm 42 is in electrical contact with the matching arms 31-32, and the circuit breaker is in electrical contact with the matching arms 31-32. When switched to the open state, the operating mechanism of the circuit breaker drives the contact arm 42 to swing to disconnect it from the matching arms 31-32; the switch arm 41 and the intermediate conductive structure 2 are kept in a normally open state, and the circuit breaker is in the closed state. , press the test button 5 to drive the switch arm 41 to swing so that it is in contact with the movable contact spring as the intermediate conductive structure 2 and conducts. Further, the moving contact 1 may be either the phase-pole moving contact of the circuit breaker or the N-pole moving contact of the circuit breaker.

The leakage test circuit has a simple structure, adopts a mechanical transmission mode, and has reliable action; and when the circuit breaker is in an open state, between the contact arm 42 and the matching arms 31-32, between the switch arm 41 and the intermediate conductive structure 2 Two electrical breakpoints are formed, which is safer and greatly reduces the possibility of conducting the leakage test circuit under unexpected conditions (such as operator's misoperation, etc.); Realization, the moving contact spring also plays the function of the installation of the moving contact 1 to realize overtravel and an electrical breakpoint of the leakage test circuit, which is beneficial to simplify the structure of the leakage test circuit and reduce the number of parts of the circuit breaker.

Specifically, as shown in Figures 1-2, 7, and 12-13, the circuit breaker of the present invention is preferably a two-phase circuit breaker. The matching conductive structure 3, the switch elastic member 4 and the intermediate conductive structure 2 are connected in series to the circuit breaker in sequence. Between the L-pole circuit and the N-pole circuit, the moving contact 1 is the L-pole moving contact of the circuit breaker.

As other embodiments, the circuit breaker of the present invention can also be a multi-phase circuit breaker, such as 3-phase, 4-phase or more phases, which includes an N-pole circuit and a plurality of phase-pole circuits, and the matching conductive structure 3 of the leakage test circuit. , The switch elastic member 4 and the intermediate conductive structure 2 are sequentially connected in series between the N-pole circuit and any one of the phase-pole circuits.

3-6 and 8-11, when the circuit breaker is switched from the closed state to the open state, the operating mechanism drives the contact arm 42 of the switch elastic member 4 to disconnect from the matching arms 31-32. Further, when the circuit breaker is switched from the closed state to the open state, the operating mechanism drives the contact arm 42 to swing to disconnect it from the cooperating arms 31-32; when the circuit breaker is switched from the open state to the closed state , the contact arm 42 of the switch elastic member 4 is automatically reset to be in contact with the matching arms 31-32.

With reference to Figures 8-11 and 14-17, when the circuit breaker is in the closed state, press the test button 5 to drive the switch arm 41 of the switch elastic member 4 to be in contact with the moving contact spring as the intermediate conductive structure 2. . Further, in the closed state of the circuit breaker, the test button 5 is pressed to drive the switch arm 41 to swing so that it is in contact with the moving contact spring as the intermediate conductive structure 2; when the test button 5 is released, the switch arm 41 is automatically reset to disconnect from the moving contact spring as the intermediate conductive structure 2 . Of course, in the open state of the circuit breaker, pressing the test button 5 can also drive the switch arm 41 of the switch elastic member 4 to contact the moving contact spring as the intermediate conductive structure 2, but in this case, due to the operation The mechanism drives the contact arm 42 to disconnect from the mating arms 31-32, so the leakage test circuit is still in an open state as a whole.

Specifically, as shown in FIGS. 1-17 and 20, the switch elastic member 4 is a switch torsion spring, the switch torsion spring includes a switch torsion coil 40, and the two ends of the switch torsion spring connected to the switch torsion coil 40 are respectively Switch arm 41 and contact arm 42 .

As shown in Figures 3-6, 8-11, 14-17, and 20, the switch elastic member 4 is a switch torsion spring, and its switch arm 41 includes a switch arm first segment 41-0, a switch arm, and a switch arm that are connected in sequence. The second segment 41-1, the third segment 41-2 of the switch arm and the fourth segment 41-3 of the switch arm, the fourth segment 41-3 of the switch arm are respectively connected to the switch torsion coil 40 and the third segment 41-2 of the switch arm , the first segment 41-0 of the switch arm is matched with the middle conductive structure 2, and the third segment 41-2 of the switch arm is matched with the test button 5. Further, the third section 41-2 of the switch arm is parallel to the axial direction of the switch torsion spring and perpendicular to the moving direction of the test button 5; the first section 41-0 of the switch arm is parallel to the third section 41-0 of the switch arm. 2. The first section 41-0 of the switch arm, the second section 41-1 of the switch arm and the third section 41-2 of the switch arm are in a U-shaped structure as a whole.

As shown in Figures 3-6, 8-11, 14-17 and 20, the switch elastic member 4 is a switch torsion spring, and its contact arm 42 includes a contact arm first segment 42-0, a contact arm and a contact arm that are connected in sequence by bending. The second section 42-1 and the third section 42-2 of the contact arm are respectively connected to the second section 42-1 of the contact arm and the switch torsion coil 40 at both ends, and the first section 42 of the contact arm -0 cooperates with the operating mechanism drive. Further, the first section 42-0 of the contact arm is parallel to the axial direction of the switch torsion spring; the third section 42-2 of the contact arm is in contact with the matching arm 31-32 in conduction.

As shown in FIG. 18, it is an embodiment of the test button 5: the test button 5 includes a button operation part 50 and a button installation part 51, the button operation part 50 protrudes outside the casing h0, the button installation part 51 is inserted Placed in the housing h0, the button mounting part 51 includes a pair of mounting hooks 51-0 arranged oppositely, and the mounting hooks 51-0 cooperate with the inner surface of the housing h0 to prevent the test button 5 from coming out of the housing h0. A button driving surface 51-00 is provided between the mounting hooks 51-0, and both ends of the button driving surface 51-00 are connected to the two mounting hooks 51-0 and are connected to the third section 41-2 of the switch arm 41 of the switch arm 41. Abut.

As shown in FIG. 18 , the connection between the button operation part 50 and the button installation part 51 is provided with a button limit table 50-51, which cooperates with the housing h0 to limit the position. When the test button 5 is pressed, the test button 5 is limited to the housing h0. distance moved within.

As shown in Figures 1-2 and 7, the operating mechanism further includes a rotating lever 14, the lever 14 is drivingly connected with the moving contact 1, and the lever 14 rotates to drive the moving contact 1 to rotate to close or close the stationary contact. Disconnect; when the circuit breaker is switched from the closed state to the open state, the lever 14 drives the movable contact 1 to disconnect from the static contact, and drives the contact arm 42 of the switch elastic member 4 to move to make it connect with the matching arm 31 at the same time. -32 disconnect.

As shown in FIGS. 6 and 11 , the lever 14 includes a lever driving side. When the circuit breaker is switched from the closed state to the open state, the lever driving side presses the contact arm first section 42 of the contact arm 42 of the switch elastic member 4 -0 swings the contact arm 42 to disconnect from the mating arms 31-32.

It should be pointed out that the contact arm 42 can also be driven by other components of the operating mechanism (such as the handle of the operating mechanism, the connecting rod, etc.), which are used to drive the components of the contact arm 42 of the switch elastic member 4. When the state of the circuit breaker changes (that is, when the circuit breaker switches between the closed state and the open state), a change in position occurs to drive the contact arm 42 to act.

The switch arm 41 and the contact arm 42 of the switch elastic member 4 and the action process of the test button 5 will be described below:

In the directions shown in Figures 3-4 and 8-9, when the circuit breaker is switched from the closed state to the open state, the lever 14 rotates counterclockwise to press the first section 42 of the contact arm 42 against the contact arm 42 through the lever drive side. -0, the contact arm 42 swings counterclockwise, thereby disconnecting from the first section 31 of the cooperating arms 31-32; when the circuit breaker is switched from the open state to the closed state, the contact arm 42 is automatically reset to prevent Press on the first segment 31 of the fitting arm, so that the two are in contact and conduct.

As shown in Figures 8-9 and 14-15, press the test button 5, and the test button 5 presses the third section 41-2 of the switch arm of the switch arm 41, so that the switch arm 41 rotates clockwise, so that the switch arm The first section 41-0 of the switch arm of 41 is in contact with the intermediate conductive structure 2; after releasing the test button 5, the switch arm 41 is automatically reset, thereby disconnecting the first section 41-0 of the switch arm from the intermediate conductive structure 2 .

As shown in Figures 1-3, 5, 7-8, 10, 12-14, and 16, the moving contact spring, that is, the middle conductive structure 2, is a torsion spring, and one end is in contact with the moving contact 1 to limit the position And it is turned on, and the other end is matched with the switch arm 41 of the switch elastic member 4 . Further, the movable contact 1 is rotatably arranged on the lever 14, the movable contact spring is sleeved on the rotating shaft of the movable contact 1, and the movable contact spring first arm 21 (FIG. 16) of the movable contact spring is connected to the movable contact spring. The contact 1 contacts the limit and conducts, and the second arm of the movable contact spring cooperates with the lever 14 in limit. Further, the lever 14 further includes a lever limiting portion 14-0, which is cooperating with the second arm of the movable contact spring.

As shown in FIG. 19, it is an embodiment of the moving contact spring: the moving contact spring includes a moving contact spring coil 20 and a moving contact spring first arm 21 and The second arm of the movable contact spring; the first arm 21 of the movable contact spring includes a first segment 21-0 of the first arm and a second segment 21-1 of the first arm, and both ends of the second segment 21-1 of the first arm They are respectively connected to one end of the movable contact spring coil 20 and the first section 21-0 of the first arm. The first section 21-0 of the first arm is parallel to the axial direction of the movable contact spring coil 20 and is in contact with the movable contact 1 to limit the position. The second arm of the movable contact spring includes the first segment 22 of the second arm, the second segment 23-1 of the second arm and the third segment 23-0 of the second arm, which are connected in sequence. The two ends of the segment 22 are respectively connected with the second segment 23-1 of the second arm and the spring coil 20 of the movable contact, and the first segment 22 of the second arm and the lever limiting portion 14-0 of the lever 14 are in position-limiting cooperation. The three sections 23 - 0 are matched with the contact arm 42 of the switch elastic member 4 , and the third section 23 - 0 of the second arm and the first section 42 - 0 of the contact arm of the contact arm 42 intersect in space.

As shown in Figures 3-6, 8-11, 14-17 and 21, the matching conductive structure 3 is a torsion spring, which is a matching torsion spring, and the matching torsion spring includes a matching torsion coil 30, Of the two ends connected to the mating torsion spring coil 30, one is fixedly arranged, and the other is connected to the mating arms 31-32.

As shown in Figures 5-6, 10-12, 16-17, and 21, the matching arms 31-32 include a first section 31 of the matching arm and a second section 32 of the matching arm. The two ends of the second section 32 of the matching arm are respectively connected with The matching torsion spring coil 30 and the first section 31 of the matching arm are connected, the first section 31 of the matching arm is parallel to the axial direction of the matching torsion spring, and the first section 31 of the matching arm is matched with the first section 42-0 of the contacting arm 42 and The two intersect in space.

As shown in Figure 1-17, the leakage test circuit is located on one side of the operating mechanism as a whole, and the switch elastic member 4 is a switch torsion spring. The switch torsion spring and the axis of the matching torsion spring are arranged in parallel and spaced apart along the thickness direction of the circuit breaker. Set side by side.

As shown in Fig. 1-17, the matching conductive structure 3 is electrically connected to the N-pole circuit of the circuit breaker, and the intermediate conductive structure 2 is electrically connected to the phase-pole circuit of the circuit breaker.

As shown in Figure 1-17, the leakage test circuit also includes a current limiting resistor 6 and a zero-sequence current induction coil 10. The current limiting resistor 6 is connected in series between the matching conductive structure 3 and the N-pole terminal 12 of the circuit breaker. The sequence current induction coil 10 is connected in series between the intermediate conductive structure 2 and the phase-pole terminal 13 of the circuit breaker, and the N-pole terminal 12 and the phase-pole terminal 13 are both incoming or outgoing terminals. Further, as shown in Figures 12-14 and 16, the circuit breaker of the present invention also includes a soft connection 7, a bimetallic sheet 8 and a conductive support 9, an intermediate conductive structure 2, and a phase-pole moving contact 1 of the circuit breaker, The soft connection 7, the bimetal 8, the conductive support 9, the zero-sequence current induction coil 10 and the phase-pole terminal 13 are connected in series in sequence, and the bimetal 8 is fixed on the housing h0 through the conductive support 9, and is matched with the conductive structure 3, The current limiting resistor 6 and the N-pole terminal 12 of the circuit breaker are connected in series in sequence.

Specifically, the circuit breaker of the present invention is a two-phase circuit breaker, and the phase-pole connection terminal 13 is also the L-pole connection terminal of the circuit breaker.

As shown in Figures 1-2, 7, and 12-13, the circuit breaker of the present invention further includes a partition h1 arranged in the casing h0, and the matching conductive structure 3 and the switch elastic member 4 of the leakage test circuit are respectively arranged on the partition On both sides of h1, the switch elastic member 4 is a switch torsion spring, and the switch torsion spring is sleeved on the torsion spring shaft h10 on the partition h1.

In the circuit breaker of the present invention, the operating mechanism of the circuit breaker can be realized by the existing technology, and at least the operating mechanism of the following two structures can be adopted:

Structure 1: The operating mechanism is a traditional four-link mechanism, which includes a handle, a first link, a jumper, a lock, and a lever 14. The handle and the lever 14 are respectively rotated and arranged on the housing h0, and the jumper The locking piece and the locking piece are snap-fitted and are respectively rotated and arranged on the lever 14. The handle is driven and connected to the jumping piece through the first connecting rod. Thus tripping the operating mechanism.

Structure 2: The operating mechanism adopts a cam-five-link mechanism, which includes a handle, a second link, a third link, a jumper, a lock and a lever 14. The handle, jumper, lock and The levers 14 are respectively rotatably arranged on the housing h0, the middle of the jumper is provided with an elongated waist-shaped hole of the jumper, one end of the second link is rotatably connected with the handle, and the other end is rotatably connected with one end of the third link and is inserted into the middle of the jumper. The other end of the third connecting rod is connected to the lever 14 in rotation, one end of the jumper is set in rotation, and the other end is engaged with the locking piece, and the locking piece is driven by external force. When the handle is rotated through the second link and the third link to drive the lever 14 to realize the opening or closing operation, the second link and the The end of the third link inserted into the waist-shaped hole of the jumper moves along the waist-shaped hole of the jumper. The tripping component composed of the jumper and the lock of this operating mechanism is connected with the second link and the third link. The transmission component composed of the lever 14 is relatively independent, and the jumping fastener and the locking fastener do not rotate when they are snap-fitted, so that the transmission stability is high.

It should be pointed out that the external force for driving the locking member may come from a short-circuit protection mechanism, an overload protection mechanism or a shunt release.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be considered that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deductions or substitutions can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims (12)

1. A leakage test circuit of a circuit breaker, characterized in that: the leakage test circuit comprises a matching conductive structure (3), a switch elastic member (4) that are sequentially connected in series between the phase-pole circuit and the N-pole circuit of the circuit breaker and an intermediate conductive structure (2), and a test button (5); the intermediate conductive structure (2) provides an overtravel force to the movable contact (1) of the circuit breaker and is in contact with the movable contact (1) for conduction. A moving contact spring; the mating conductive structure (3) includes mating arms (31-32), and the switch elastic member (4) includes a switch arm (41) and a contact arm (42); In the closed state of the circuit breaker, the contact arm (42) and the matching arms (31-32) are in contact and electrically connected, and when the circuit breaker is switched to the open state, the operating mechanism of the circuit breaker drives the contact arm (42) and the matching arm (31-32) Disconnect; The switch arm (41) and the intermediate conductive structure (2) are kept in a normally open state, and when the circuit breaker is in the closed state, the test button (5) is pressed to drive the switch arm (41) to contact the intermediate conductive structure (2) for conduction. . 2. The leakage test circuit of a circuit breaker according to claim 1, characterized in that: the operating mechanism comprises a lever (14) arranged in rotation, and the moving contact (1) is arranged in rotation on the lever (14); the The moving contact spring is a torsion spring, which is arranged coaxially with the moving contact (1). One end of the torsion spring is in contact with the moving contact, and the other end is matched with the switch arm (41). 3. The leakage test circuit of a circuit breaker according to claim 1, wherein the switch elastic member (4) is a switch torsion spring, and the two ends of the switch torsion spring are respectively a switch arm (41) and a contact arm ( 42), the switch arm (41) comprises a first segment (41-0) of the switch arm, a second segment (41-1) of the switch arm, a third segment (41-2) of the switch arm, and the first segment (41-2) of the switch arm and the Four sections (41-3), both ends of the fourth section (41-3) of the switch arm are respectively connected with the switch torsion coil (40) and the third section (41-2) of the switch arm, and the first section of the switch arm (41- 0) Cooperate with the middle conductive structure (2), and the third section (41-2) of the switch arm cooperates with the test button (5). 4. The leakage test circuit of a circuit breaker according to claim 1, wherein the switch elastic member (4) is a switch torsion spring, and the two ends of the switch torsion spring are respectively a switch arm (41) and a contact arm ( 42), the contact arm (42) includes a first segment (42-0) of the contact arm, a second segment (42-1) of the contact arm and a third segment (42-2) of the contact arm, which are connected in turn by bending. Both ends of the three segments (42-2) are respectively connected with the second segment (42-1) of the contact arm and the switch torsion coil (40), and the first segment (42-0) of the contact arm is driven and matched with the operating mechanism. 5. The leakage test circuit of the circuit breaker according to claim 1, characterized in that: when the circuit breaker is switched from the closed state to the open state, the lever (14) of the operating mechanism drives the movable contact (1) to connect to the open state. The static contact is disconnected, and the driven contact arm (42) is disconnected from the mating arms (31-32). 6. The leakage test circuit of a circuit breaker according to claim 5, wherein the operating mechanism comprises a handle, a second link, a third link, a jumper, a lock and a lever (14), The handle, the jumper, the lock and the lever (14) are respectively rotatably arranged on the housing (h0), the jumper is provided with a waist-shaped hole of the jumper, one end of the second connecting rod is connected with the handle in rotation, and the other end is connected with the handle. One end of the third link is rotatably connected and inserted into the waist-shaped hole of the jumper, the other end of the third link is rotatably connected with the lever (14), one end of the jumper is rotatably arranged, and the other end is connected with the lock The snap fit, the locking piece is driven by an external force to rotate to release the snap fit with the tripping piece, and when the handle is rotated through the second link and the third link to drive the lever (14) to realize the opening or closing operation, the first One end of the second link and the third link inserted into the waist-shaped hole of the jumping fastener moves along the waist-shaped hole of the jumping fastener. 7. The leakage test circuit of a circuit breaker according to claim 1, wherein the matching conductive structure (3) is a torsion spring, the torsion spring is a matching torsion spring, and the matching torsion spring comprises a matching torsion coil (30). ), one of the two ends of the mating torsion spring connected to the mating torsion spring coil is fixedly arranged, and the other is the mating arm (31-32). 8 . The leakage test circuit of the circuit breaker according to claim 7 , wherein the matching arms ( 31 - 32 ) comprise a first section ( 31 ) of the matching arm and a second section ( 32 ) of the matching arm, and the matching arm Both ends of the second section (32) are respectively connected with the mating torsion spring coil (30) and the first section (31) of the mating arm, and the first section (31) of the mating arm and the first section (42) of the contact arm of the contact arm (42) -0) mating and the mating arm first segment (31) spatially intersects the contact arm first segment (42-0). 9. The leakage test circuit of a circuit breaker according to claim 1, wherein the leakage test circuit further comprises a current limiting resistor (6) and a zero-sequence current induction coil (10), and the current limiting resistor (6) is connected in series Between the matching conductive structure (3) and the N-pole terminal (12) of the circuit breaker, the zero-sequence current induction coil (10) is connected in series between the intermediate conductive structure (2) and the phase-pole terminal (13) of the circuit breaker , the N-pole terminal (12) and the phase-pole terminal (13) are both incoming terminals or outgoing terminals. 10. The leakage test circuit of a circuit breaker according to claim 7, characterized in that: the leakage test circuit is located on one side of the operating mechanism as a whole, the switch elastic member (4) is a switch torsion spring, the switch torsion spring and the matching torsion spring The axes of the circuit breakers are arranged in parallel and spaced apart and side by side along the thickness direction of the circuit breaker. 11. A circuit breaker, characterized in that it comprises the leakage test circuit according to any one of claims 1-10. 12. The circuit breaker according to claim 11, characterized in that: the circuit breaker further comprises a casing (h0) and a partition (h1), and the operating mechanism, the leakage test circuit and the partition (h1) are all arranged in the casing inside the body (h0); the switch elastic member (4) and the matching conductive structure (3) are respectively arranged on both sides of the partition plate (h1), the switch elastic member (4) is a switch torsion spring, and the switch torsion spring is sleeved on the partition plate (h1). on the torsion spring shaft (h10) of the plate (h1).

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