CN210897173U

CN210897173U - Improved structure of ground fault circuit breaker

Info

Publication number: CN210897173U
Application number: CN201921937317.2U
Authority: CN
Inventors: 严华; 陈彬; 蔡苏丰
Original assignee: Jiangsu General Protecht Co Ltd
Current assignee: Jiangsu General Protecht Co Ltd
Priority date: 2019-11-11
Filing date: 2019-11-11
Publication date: 2020-06-30
Anticipated expiration: 2029-11-11

Abstract

The utility model provides an improved structure of a ground fault circuit breaker, which is mainly characterized in that a lock catch arm is also arranged in the ground fault circuit breaker, a stop surface is arranged on the lock catch arm, and a support body fixedly connected with a soft magnet is provided with a stop part which can interfere with the stop surface moving downwards; the lock catch arm is also connected with an elastic element, and under a normal state, the elastic element enables the stop surface on the lock catch arm to move downwards to interfere with the stop part on the support body so as to prevent the soft magnet from moving towards the direction of the permanent magnet; the lock catch arm can be pressed and driven by the reset key to enable the stopping surface to move upwards, so that the stopping portion and the stopping surface are not interfered any more. The utility model discloses an increase backstop structure, avoid load circuit accidental switch-on under the uncontrolled condition, avoid producing the secondary damage.

Description

Improved structure of ground fault circuit breaker

Technical Field

The utility model relates to a structure of Ground Fault Circuit Interrupter (GFCI).

Background

A Ground Fault Circuit Interrupter (GFCI) is capable of keeping a current contact on in a normal state, and capable of breaking the current contact by a magnetic force of an electromagnetic coil when a ground fault occurs, thereby effectively preventing accidents or disasters such as personal electric shock and electrical equipment disconnection.

A more typical Ground Fault Circuit Interrupter (GFCI), such as CN815664A, is described in detail with respect to its structure.

However, the existing ground fault circuit interrupter still has some defects in use.

For example, when a ground fault occurs, the conventional ground fault circuit interrupter can open the conductive contacts by the magnetic force of the electromagnetic coil; however, if an external force acts on the electrical contact, the electrical contact may be restored to the on state, which may cause secondary accidents or disasters such as personal electric shock and electrical equipment disconnection, and thus, there is a potential safety hazard.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides an improved structure of a ground fault circuit interrupter to avoid the occurrence of an uncontrolled make-up of the energized contacts.

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

the utility model provides an earth fault circuit breaker's improvement structure, the inside earth leakage protection operating mechanism that is equipped with of earth fault circuit breaker, earth leakage protection operating mechanism includes the sleeve, fixes the permanent magnet of sleeve one end position, can be in the sleeve gliding soft magnet, connect the elasticity mechanism between soft magnet and sleeve and arrange the action coil outside the sleeve, still is equipped with the button that resets that can trigger action coil on the earth fault circuit breaker, its characterized in that:

a lock catch arm is further arranged in the ground fault circuit breaker, a stop surface is arranged on the lock catch arm, and a stop part capable of interfering with the stop surface moving downwards is arranged on the support body fixedly connected with the soft magnet;

the lock catch arm is also connected with an elastic element, and under a normal state, the elastic element enables the stop surface on the lock catch arm to move downwards to interfere with the stop part on the support body so as to prevent the soft magnet from moving towards the direction of the permanent magnet;

the lock catch arm can be pressed and driven by the reset key to enable the stopping surface to move upwards, so that the stopping portion and the stopping surface are not interfered any more.

The improved structure of the ground fault circuit interrupter, wherein: the middle part of the lock catch arm is fixed through a torsion beam, and the torsion beam forms the elastic element.

The improved structure of the ground fault circuit interrupter, wherein: a conversion arm which can be pushed by the reset key is arranged below the reset key, and a lug is arranged at one end of the conversion arm downwards; the latch arm is arranged below the conversion arm, one end of the latch arm can be in contact with the convex block of the conversion arm, and the other end of the latch arm protrudes downwards to form the stop surface.

The improved structure of the ground fault circuit interrupter, wherein: the back side of the stopping surface is provided with a slope surface, and/or the stopping portion is provided with a slope surface at a position connected with the back side of the stopping surface.

The improved structure of the ground fault circuit interrupter, wherein: the movable contact piece is connected to the bracket body and can be contacted with the fixed static contact piece to connect the load circuit of the ground fault circuit breaker;

the support body fixedly connected with the soft magnet is provided with a pair of accommodating grooves which are arranged in parallel at intervals, a spring is arranged in each accommodating groove, two ends of each movable contact are respectively and fixedly provided with a movable contact, one side of each movable contact is abutted to the outer extending end of one spring, the other side of each movable contact is provided with a fixed contact, and the fixed contact is fixed in position and is connected with the load circuit.

The improved structure of the ground fault circuit interrupter, wherein: the inboard at each vice power socket of ground fault circuit breaker all is equipped with the emergency exit, the emergency exit includes baffle, support and elastomeric element, wherein:

the baffle is provided with a front inclined plane and a rear inclined plane which have the same inclination direction and are arranged at intervals front and back, the lower end of the front inclined plane is free from blocking, and the lower end of the rear inclined plane is open and can be penetrated by the positive and negative electrode inserting pieces simultaneously; the baffle is provided with a pair of sliding blocks on the left and right sides between the front inclined plane and the rear inclined plane;

the bracket is provided with a front through hole and a rear through hole which are arranged at intervals in front and back and respectively correspond to the front inclined plane and the rear inclined plane in position; a pair of slide ways is arranged on the left side and the right side of the bracket;

the baffle is arranged on the bracket, the slide block is connected with the slide way, so that the baffle can slide relative to the bracket, and meanwhile, the contact position of the slide block and the slide way also forms a pair of fulcrums, so that the baffle can perform seesaw type movement on the bracket;

the elastic component is abutted against the baffle plate, so that the sliding block of the baffle plate is subjected to the elastic force of resetting to a high position when being positioned on the slide way.

The improved structure of the ground fault circuit interrupter, wherein: the inclination direction of the bottom surface of the sliding block is opposite to that of the front inclined surface.

The improved structure of the ground fault circuit interrupter, wherein: a stop hook extends downwards from the front end of the baffle, a retaining wall is arranged at the front end of the bracket, and the stop hook is driven by the sinking of the front inclined surface to interfere with the retaining wall of the bracket, so that the baffle cannot move backwards;

a pair of supporting wings are arranged at the rear end of the baffle, a blocking groove is formed in the rear end of the support, and the supporting wings can interfere with the blocking groove of the support under the driving of the sinking of the front inclined surface.

The improved structure of the ground fault circuit interrupter, wherein: an auxiliary slideway also extends behind the baffle groove, and the supporting wings can slide in the auxiliary slideway, so that the baffle plate can stably slide relative to the bracket.

The utility model has the advantages that: under the condition that the button resets not pushed down, the conversion arm can not take place the contact with the hasp arm, the hasp arm keeps the horizontality under torsion beam (accessible support and sleeve formation are fixed) initial positioning effect, and make backstop face and backstop portion on the stake body take place to interfere, at this moment, if soft magnet meets with external force, perhaps because the circuit is in disorder, lead to soft magnet uncontrolled ground to the removal of permanent magnet direction, because the effect of blockking of backstop face, soft magnet can not take place to remove, can not produce the secondary damage of unexpected switch on power.

Drawings

Fig. 1 is an exploded perspective view of a ground fault circuit interrupter provided by the present invention;

fig. 2 and 3 are schematic structural views of the earth leakage protection operating mechanism in the on and off states of the load circuit, respectively;

fig. 4 and 5 are cross-sectional structural diagrams of the ground fault circuit interrupter provided by the present invention before and after the reset button is pressed (compared with fig. 1, an iron sheet for grounding installation is added);

fig. 6 and 7 are schematic diagrams of the action of the movable contact piece and the static contact piece of the ground fault circuit breaker provided by the present invention;

fig. 8 and 9 are respectively an exploded structure schematic view and a combined structure schematic view of the safety door;

FIGS. 10 and 11 are schematic views respectively showing the safety door being inserted by iron wires for safety protection;

figure 12 is a schematic view of the operation of the security door when the plug is inserted.

Description of reference numerals: a bottom case 1; a middle shell 2; a top cover 3; a power jack 31; a reset button 32; a test key 33; a retaining wall 34; a power supply plug bush 4; a safety door 5; an earth leakage protection operation mechanism 6; a reset contact 601; a mutual inductor 61; a sleeve 62; a permanent magnet 63; a soft-magnetic body 64; an elastic mechanism 65; an action coil 66; a support body 67; a stopper portion 671; a receiving groove 672; a spring 673; a movable contact piece 68; a moving contact 681; stationary contact 691; a switching arm 71; a bump 711; latch arm 72; a torsion beam 73; a stop surface 74; a slope 741; a baffle plate 8; a front bevel 81; a rear bevel 82; a slider 83; the support wings 84; a catch hook 85; a bracket 9; a front perforation 91; a rear perforation 92; a slideway 93; catch arm 931; an auxiliary runner 94; a retaining wall 95; the catch groove 96; an elastic member 99.

Detailed Description

Some specific embodiments of the invention will be described in detail below, by way of example and not by way of limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale.

As shown in fig. 1, the ground fault circuit interrupter has a frame formed by sequentially assembling a bottom case 1, a middle case 2, and a top cover 3, a power plug bush 4 is fixed to the middle case 2, a power jack 31 is provided on the top cover 3, a safety door 5 for preventing accidental electric shock is provided between the power jack 31 and the power plug bush 4, an earth leakage protection operating mechanism 6 is fixed between the middle case 2 and the bottom case 1, the earth leakage protection operating mechanism 6 penetrates through the middle case 2 to form a reset contact 601, a reset button 32 and a test button 33 are provided on the top cover 3, and when the reset button 32 is pressed, the reset contact 601 can be turned on.

As shown in fig. 2 and 3, the earth leakage protection operating mechanism 6 includes a sleeve 62, a permanent magnet 63 fixed to an end of the sleeve 62, a soft magnet 64 slidable in the sleeve 62, an elastic mechanism 65 connected between the soft magnet 64 and the sleeve 62, and an operating coil 66 disposed outside the sleeve 62.

As shown in fig. 2-6, when the moving coil 66 is energized, the soft magnet 64 overcomes the resistance of the elastic mechanism 65 under the action of magnetic force, and is attracted to the permanent magnet 63, and at this time, the moving contact 681 on the moving contact 68 on the bracket body 67 fixedly connected with the soft magnet 64 contacts the stationary contact 691 on the stationary contact with a fixed position, so that the ground fault interrupter can output power outwards.

When the load end has a fault, the mutual inductor 61 collects a fault signal to cut off the power of the acting coil 66, and the soft magnet 64 is separated from the permanent magnet 63 under the action of the elastic mechanism 65, so that the movable contact 681 on the movable contact 68 on the bracket body 67 is separated from the fixed contact 691 on the fixed position fixed contact, and the ground fault circuit breaker does not output power outwards any more.

In a fault state, if the soft magnet 64 is subjected to an external force or the soft magnet 64 moves toward the permanent magnet 63 in an uncontrolled manner due to a circuit disorder and contacts the same, so that the fault interrupter resumes the outward output of power, secondary damage may be caused to a fault point.

In order to avoid the situation of secondary injury, the utility model is provided with a conversion arm 71 below the reset key 32, the conversion arm 71 is arranged on the middle shell 2 and can be pushed by the reset key 32, and a lug 711 is arranged at one end of the conversion arm 71 downwards; a latch arm 72 is arranged below the conversion arm 71, the middle part of the latch arm 72 is fixed by a torsion beam 73, one end of the latch arm 72 can be contacted with a convex block 711 of the conversion arm 71, and the other end of the latch arm is downwards protruded to form a stop surface 74; a stopping part 671 capable of interfering with the stopping surface 74 is arranged on the bracket body 67 fixedly connected with the soft magnet 64; the torsion beam 73 normally extends the stop surface 74 of the latch arm 72 downwardly to the stop position. The torsion beam 73 may be replaced with other elastic members.

Under the condition that the reset key 32 is not pressed, the switching arm 71 does not contact with the latch arm 72, the latch arm 72 is kept in a horizontal state under the initial positioning action of the torsion beam 73 (which can be fixed on the sleeve 62), so that the stop surface 74 interferes with the stop portion 671 on the bracket body 67, at this time, if the soft magnet 64 is subjected to an external force or a circuit is disordered, the soft magnet 64 moves towards the permanent magnet 63 uncontrollably, and due to the blocking action of the stop surface 74, the soft magnet 64 cannot move, and secondary damage of accidentally turning on a power supply cannot be caused.

When the operator confirms that the fault is cleared, the operator can press the reset key 32 to press the switching arm 71 down by the reset key 32, the bump 711 of the switching arm 71 presses down one end of the latch arm 72, and the other end (i.e., the end provided with the stop surface 74) of the latch arm 72 tilts up to no longer block the support body 67, so that the soft magnetic body 64 can smoothly contact with the permanent magnet 63.

Upon release of the reset button 32, the stop surface 74 of the latch arm 72 returns to the stop position under the influence of the torsion beam 73; when a fault occurs, when the soft magnet 64 drives the support body 67 to move away from the permanent magnet 63, because the back side of the stop surface 74 has a slope surface 741 (the position on the stop portion 671, which is connected to the back side of the stop surface 74, may also be provided with a slope surface), the support body 67 can slide along the slope surface 741 to jack up and pass through one end of the latch arm 72, which has the stop surface 74; after the passage of the holder body 67, the stop face 74 of the latch arm 72 returns to the stop position again; the operation is repeated in a circulating way.

Additionally, the utility model discloses still improve ground fault circuit breaker's movable contact 68's structure, make it can form balanced atress with the static contact.

As shown in fig. 6 and 7, a pair of accommodating grooves 672 arranged in parallel at intervals are provided on the support body 67 fixedly connected with the soft magnet 64, a spring 673 is arranged in each accommodating groove 672, two ends of the movable contact 68 are respectively fixed with a movable contact 681, one side of each movable contact 681 is abutted against an outer extension end of one spring 673, the other side of each movable contact 681 is arranged with a fixed contact 691, and the fixed contact 691 is fixed in position and is connected with a load circuit.

The support body 67 can reciprocate along with the soft magnet 64, when two movable contacts 681 approach the fixed contacts 691, if one movable contact 681 contacts one of the fixed contacts 691 first due to deflection (as shown in fig. 4), during the process that the support body 67 continues to approach, the spring 673 abutted by the movable contact 681 which contacts first will be compressed until the other movable contact 681 contacts the other fixed contact 691 (as shown in fig. 5), and the support body 67 can also continue to approach until both springs 673 are compressed.

In this process, due to the presence of the spring 673, the balance of the movable contact 68 can be maintained, damage or failure of each contact due to forced pressing can be avoided, and the movable contact 681 and the stationary contact 691 can be bonded more closely, so that a gap is not easily generated to cause electric fire.

In order to prevent children, children from inserting the power sockets by holding conductive objects such as iron wires and the like, and to lead to accidental electric shock, the utility model discloses the safety door is all equipped with in the inboard of each vice power socket.

As shown in fig. 8 and 9, which are respectively an exploded structural schematic view and a combined structural schematic view of the safety door, the safety door includes a blocking plate 8 and a bracket 9, wherein:

the baffle 8 is provided with a front inclined surface 81 and a rear inclined surface 82 which have the same inclination direction and are arranged at intervals front and back, the lower end of the front inclined surface 81 is free from baffle, and the lower end of the rear inclined surface 82 is open and can be used for a positive electrode insert and a negative electrode insert on a plug to pass through smoothly; the left side and the right side of the baffle plate 8 are provided with sliding blocks 83 between the front inclined surface 81 and the rear inclined surface 82, and the bottom surface of each sliding block 83 is preferably an inclined surface with the inclined direction opposite to that of the front inclined surface 81 and the rear inclined surface 82;

the bracket 9 is provided with a front perforation 91 and a rear perforation 92 which are arranged at intervals in front and back and respectively correspond to the positions of the front inclined surface 81 and the rear inclined surface 82; the left side and the right side of the bracket 9 are respectively provided with a slide way 93 with the opposite inclination direction to the front inclined plane 81 and the rear inclined plane 82 at intervals in the front and back direction;

the baffle 8 is arranged on the support 9, the sliding block 83 is connected with the sliding way 93, so that the baffle 8 can slide relative to the support 9, and meanwhile, the contact position of the sliding block 83 and the sliding way 93 also forms a pair of supporting points, so that the baffle 8 can perform seesaw type movement on the support 9;

the baffle 8 is further abutted with an elastic member 99 (e.g., a spring plate), and the elastic member 99 makes the slider 83 of the baffle 8 receive an elastic force of returning to the high position when being positioned on the slide way 93.

As shown in fig. 8-11, the safety door is installed in the top cover 3, the bracket 9 is fixed on the top cover 3, the baffle 8 is clamped between the upper side of the bracket 9 and the lower side of the top cover 3, and the elastic sheet is fixed on the inner side of the top cover 3 and is abutted against the rear end of the baffle 8, so that the baffle 8 has a moving tendency of moving forward; and a baffle wall 34 is arranged in the top cover 3 and used for limiting the front limit position of the baffle plate 8; at the lower part of the slide 93, a stop arm 931 projecting upwards is provided, which on the one hand defines the lowest position to which the slider 83 can slide, i.e. the rear limit position of the flap 8, and on the other hand provides a sufficient height space between the bracket 9 and the top cover 3 for the flap 8 to move in the height space;

as shown in fig. 10, when an electrically conductive object such as an iron wire is inserted into the front jack of the power socket by a hand of a child or a child, since only the front inclined plane 81 is pressed, the baffle 8 performs seesaw-type motion, the front inclined plane 81 sinks, the rear inclined plane 82 tilts upwards, since the front end of the baffle 8 extends downwards to form the blocking hook 85, the front end of the bracket 9 is provided with the retaining wall 95, and the blocking hook 85 is driven by the sinking of the front inclined plane 81 to interfere with the retaining wall 95 of the bracket 9, so that the baffle 8 cannot move backwards, thereby playing a role of safety protection;

as shown in fig. 11, when a child or a child inserts a rear jack of a power socket by holding a conductive object such as an iron wire, the baffle 8 performs a seesaw movement due to the pressure of only the rear inclined surface 82, the rear inclined surface 82 sinks, the front inclined surface 81 tilts up, the pair of support wings 96 are disposed on both sides of the rear end of the baffle 8, the blocking groove 96 is disposed on the rear end of the bracket 9, and the support wings 84 are driven by the sinking of the front inclined surface 81 to interfere with the blocking groove 96 of the bracket 9, so that the baffle 8 cannot move backwards, thereby achieving a safety protection effect. In addition, an auxiliary slide way 94 extends behind the baffle groove 96, and the support wings 84 can slide in the auxiliary slide way 94, so that the baffle plate 8 can slide smoothly relative to the bracket 9.

As shown in fig. 12, which is a schematic diagram of the safety door when the plug is normally inserted into the safety door, the seesaw keeps balance due to the pressure on the front inclined surface 81 and the rear inclined surface 82, the baffle 8 slides relative to the bracket 9, so that the plug passes through the front through hole 91 and the rear through hole 92, and the power-taking operation is completed.

The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. The utility model provides an earth fault circuit breaker's improvement structure, the inside earth leakage protection operating mechanism that is equipped with of earth fault circuit breaker, earth leakage protection operating mechanism includes the sleeve, fixes the permanent magnet of sleeve one end position, can be in the sleeve gliding soft magnet, connect the elasticity mechanism between soft magnet and sleeve and arrange the action coil outside the sleeve, still is equipped with the button that resets that can trigger action coil on the earth fault circuit breaker, its characterized in that:

2. The improved structure of a ground fault circuit interrupter as defined in claim 1, wherein: the middle part of the lock catch arm is fixed through a torsion beam, and the torsion beam forms the elastic element.

3. The improved structure of a ground fault circuit interrupter as defined in claim 2, wherein: a conversion arm which can be pushed by the reset key is arranged below the reset key, and a lug is arranged at one end of the conversion arm downwards; the latch arm is arranged below the conversion arm, one end of the latch arm can be in contact with the convex block of the conversion arm, and the other end of the latch arm protrudes downwards to form the stop surface.

4. The improved structure of a ground fault circuit interrupter as defined in claim 1, wherein: the back side of the stopping surface is provided with a slope surface, and/or the stopping portion is provided with a slope surface at a position connected with the back side of the stopping surface.

5. The improved structure of a ground fault circuit interrupter as defined in claim 1, wherein: the movable contact piece is connected to the bracket body and can be contacted with the fixed static contact piece to connect the load circuit of the ground fault circuit breaker;

6. The improved structure of a ground fault circuit interrupter as defined in claim 1, wherein: the inboard at each vice power socket of ground fault circuit breaker all is equipped with the emergency exit, the emergency exit includes baffle, support and elastomeric element, wherein:

7. The improved structure of a ground fault circuit interrupter as defined in claim 6, wherein: the inclination direction of the bottom surface of the sliding block is opposite to that of the front inclined surface.

8. The improved structure of a ground fault circuit interrupter as defined in claim 6, wherein: a stop hook extends downwards from the front end of the baffle, a retaining wall is arranged at the front end of the bracket, and the stop hook is driven by the sinking of the front inclined surface to interfere with the retaining wall of the bracket, so that the baffle cannot move backwards;

a pair of supporting wings are arranged at the rear end of the baffle, a pair of blocking grooves are formed in the rear end of the support, and the supporting wings can interfere with the blocking grooves of the support under the driving of the sinking of the front inclined surface.

9. The improved structure of a ground fault circuit interrupter as defined in claim 8, wherein: an auxiliary slideway also extends behind the baffle groove, and the supporting wings can slide in the auxiliary slideway, so that the baffle plate can stably slide relative to the bracket.