CN210925924U - Interlocking protection mechanism for circuit breaker and circuit breaker - Google Patents

Abstract

The utility model relates to a current switch technical field, concretely relates to interlock protection mechanism and circuit breaker for circuit breaker, this interlock protection mechanism is constructed to make circuit breaker separating brake and prevent its reclosing at the first state that the release breaks away from the circuit breaker, does not interfere the circuit breaker at the second state of release joint circuit breaker, include: a linkage member configured to disengage the trip unit and actuate the operating mechanism to unlock the operating mechanism in a first state, open the circuit breaker and ensure that the operating mechanism is in an unlocked state in the first state, and to be biased by the trip unit to release the actuated operating mechanism in a second state, the operating mechanism maintaining the circuit breaker open or closed; and the resetting piece is configured to be released in a first state so that the linkage piece actuates the operating mechanism, and is subjected to energy recharging and the actuating mechanism is released under the action of the linkage piece in a second state. The interlocking protection mechanism enables the circuit breaker to always keep an opening state when the tripper is separated from the circuit breaker, and reduces the electric shock risk possibly faced by a maintainer.

Description

Interlocking protection mechanism for circuit breaker and circuit breaker

Technical Field

The utility model relates to a current switch technical field especially relates to an interlocking protection mechanism and circuit breaker for circuit breaker.

Background

A circuit breaker generally refers to a switching device capable of closing, carrying, and opening a current under a normal circuit condition and closing, carrying, and opening a current under an abnormal circuit condition for a prescribed time. Common circuit breakers include conventional (frame) circuit breakers (ACBs), Molded Case Circuit Breakers (MCCBs), Miniature Circuit Breakers (MCBs), and Earth Leakage Circuit Breakers (ELCBs). Conventional circuit breakers are usually installed upstream of the distribution system for distributing electrical energy, protecting lines and power supply equipment from overloads, short circuits, etc., and are usually exposed to high voltages (up to 1200V ac and 1500V dc) and high currents. Circuit breakers are often used in conjunction with releases that can provide protection against overloads, opens, leaks, undervoltages, overvoltages, imbalances, and the like.

When the tripper is damaged or reaches the service life, a maintainer generally needs to perform the operation of replacing the tripper when the whole power distribution system is in a power failure state to protect the tripper from electric shock, and the breaker should be in a switching-off state at the moment. However, due to carelessness or improper operation of a maintainer, the trip unit may be replaced in a closing state of the circuit breaker, and such operation does not generally cause an accident considering that the entire power distribution system is in a power-off state. However, if the power distribution system is accidentally powered up due to a malfunction, and the circuit breaker is also in a closed state (no opening operation is performed), the operation of replacing the trip unit in this case may cause accidental electric shock to the maintainer, and even more serious consequences may occur. Therefore, in order to avoid the above situation, it is necessary to maintain the breaker in the open state all the time during the trip replacement, but the existing breaker cannot provide such a safe operation environment.

Based on this, the related art still strives to design an interlock protection mechanism for a circuit breaker and a circuit breaker to ensure that the circuit breaker is always opened when a release is replaced, thereby overcoming the defects of the prior art.

SUMMERY OF THE UTILITY MODEL

It is therefore an object of the present invention to provide an interlock protection mechanism for a circuit breaker and a circuit breaker, whereby the above-mentioned disadvantages of the prior art are overcome.

In order to accomplish the above task, according to an aspect of the present invention, there is provided an interlock protection mechanism for a circuit breaker, wherein the interlock protection mechanism is linked with an operating mechanism and a release of the circuit breaker and is structured such that the release is disengaged from a first state of the circuit breaker to cause the circuit breaker to open and can prevent the circuit breaker to close again, and the release is engaged a second state of the circuit breaker not to interfere with the opening or closing of the circuit breaker, the interlock protection mechanism includes: a linkage structured to disengage from contact with the trip unit and actuate the operating mechanism to unlock the operating mechanism in the first state, thereby opening the circuit breaker and ensuring that the operating mechanism is always in an unlocked state in the first state, and biased by the trip unit to release actuation of the operating mechanism in the second state, the operating mechanism maintaining opening or closing of the circuit breaker; a reset member configured to be released in the first state to cause the linkage to actuate the operating mechanism and ensure the operating mechanism is in an unlocked state, and to be recharged by the linkage in the second state.

Preferably, the linkage includes: a shaft lever; a first push rod connected to one end of the shaft and configured to be released in a first state and biased by the trip unit and rotate the shaft in a second state; a second push rod connected at the other end of the shaft and configured to actuate the operating mechanism to unlock in a first state and disengage the operating mechanism to enable locking in a second state.

Preferably, the shaft is fixed on a mounting plate for mounting the release; the first push rod is positioned on one side of the mounting plate facing a user; the second push rod passes through the mounting plate and is located on the other side of the mounting plate relative to the first push rod.

Preferably, the operating mechanism comprises a switching-off half shaft and a switching-off half shaft link which are associated with each other; the reset piece is configured to actuate the second push rod to move upwards to push the opening half-shaft connecting rod in a first state, and the opening half-shaft connecting rod presses against the opening half shaft to unlock the operating mechanism, so that the circuit breaker is opened.

Preferably, the reset piece is constructed into a tension spring, one end of the tension spring is fixed on a mounting plate for mounting the release, and the other end of the tension spring is fixed on the second push rod. The tension spring can provide effective pulling force to enable the second push rod to be pulled rapidly to actuate the opening half-shaft connecting rod while the release is removed, so that the circuit breaker is opened rapidly.

Preferably, the reset element is configured as a torsion spring, the torsion spring is sleeved at one end of the shaft rod, which is jointed with the second push rod, a first leg of the torsion spring abuts against the second push rod, and a second leg of the torsion spring abuts against a mounting plate for mounting the release and extends into the other side of the mounting plate from one side of the mounting plate, which faces the user. As an alternative embodiment, the torsion spring can also realize the function that the tension spring actuates the second push rod to move upwards to trigger the opening half-shaft connecting rod and finally open the breaker, and the torsion spring is sleeved on the shaft rod of the interlocking protection mechanism, so that the arrangement is more space-saving.

Preferably, the first push rod and the second push rod are configured to be arranged at an angle of 120 degrees to each other. The angle can ensure that the interlocking protection mechanism can effectively actuate the breaker opening half-shaft connecting rod and finally open the breaker.

Preferably, the first push rod is configured in a half moon shape; the second push rod comprises a joint part and an actuating part, the joint part is sleeved on the shaft rod and extends along the radial direction, and the actuating part extends outwards relative to the shaft rod in an angle mode; the first push rod and the second push rod are coupled to the shaft by an interference fit. Therefore, the shaft lever and the two push rods which are matched can realize stable connection, and safe and effective work of the interlocking protection mechanism is guaranteed.

Preferably, a reinforcing rib is disposed on a circumferential surface of the second push rod, and the reinforcing rib extends along the length of the second push rod. The reinforcing rib can enhance the strength of the second push rod to ensure that the second push rod bears enough tension without being damaged when the tension spring pulls the second push rod.

According to the utility model discloses an on the other hand still provides a circuit breaker, the circuit breaker includes aforementioned interlocking protection mechanism, moving contact, static contact, wherein, interlocking protection mechanism actuates when being in the first state operating device so that the moving contact with the static contact divides absolutely, thereby makes circuit breaker separating brake, interlocking protection mechanism removes the actuation when being in the second state operating device is in order to maintain the separating brake or the combined floodgate of circuit breaker.

Due to the interlocking protection mechanism, the circuit breaker can avoid the danger that the accidental electrification of a power distribution system can cause injury to a maintainer replacing a release.

Additional features and advantages of the invention will be set forth in part in the description which follows, and in part will be readily apparent to those skilled in the art from that description or recognized by practicing the invention as described herein, including the detailed description which follows, and the appended drawings.

Drawings

Embodiments of the present invention are described in detail below with reference to the attached drawing figures, wherein:

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

FIG. 2 is an enlarged partial view of FIG. 1;

fig. 3 is a schematic diagram of the circuit breaker of the present invention in a closing state, wherein the release is mounted on the circuit breaker;

FIG. 4 is an enlarged partial view of FIG. 3;

fig. 5 is a schematic diagram of the circuit breaker of the present invention in an open state, wherein the trip unit is removed from the circuit breaker;

FIG. 6 is an enlarged partial view of FIG. 5;

fig. 7 is a front view of a first embodiment of the interlock protection mechanism of the present invention, wherein a tension spring is used as the reset member and the trip is mounted on the circuit breaker;

fig. 8 is a front view of a first embodiment of the interlock protection mechanism of the present invention with the tension spring acting as a reset and the trip removed from the circuit breaker;

fig. 9 is a schematic view of an installation state of the circuit breaker of the present invention;

FIG. 10 is an assembled view of the linkage of the interlock protection mechanism of the present invention;

FIG. 11 is an exploded view of the linkage of the interlock protection mechanism of the present invention;

FIG. 12 is a front view of a linkage of the interlock protection mechanism of the present invention;

FIG. 13 is a side view of a linkage of the interlock protection mechanism of the present invention;

fig. 14 is another partial schematic structure diagram of the circuit breaker of the present invention;

fig. 15 is a side perspective view of a second embodiment of the interlock protection mechanism of the present invention, with a torsion spring as the reset and a trip mounted on the circuit breaker;

fig. 16 is a rear perspective view of a second embodiment of the interlock protection mechanism of the present invention, with a torsion spring as the reset member and the trip mounted on the circuit breaker;

FIG. 17 is an enlarged partial view of FIG. 16;

fig. 18 is a rear perspective view of a second embodiment of the interlock protection mechanism of the present invention with the torsion spring acting as a reset and the trip removed from the circuit breaker;

FIG. 19 is an enlarged partial view of FIG. 18;

fig. 20 is a schematic diagram of the circuit breaker of the present invention in an open position with the trip unit removed from the circuit breaker;

fig. 21 is a schematic diagram of the circuit breaker in the open state, wherein the release is replaced and reinstalled on the circuit breaker.

Detailed Description

Reference is now made to the drawings for describing in detail an interlock protection mechanism for a circuit breaker and an exemplary scheme of the circuit breaker according to the present invention. The drawings are provided to present embodiments of the invention, but the drawings are not necessarily to scale of the specific embodiments, and certain features may be exaggerated, removed, or partially sectioned to better illustrate and explain the disclosure of the present invention. The position of some components in the drawings can be adjusted according to actual requirements on the premise of not influencing the technical effect. The appearances of the phrase "in the drawings" or similar language in the specification are not necessarily referring to all of the drawings or the examples.

Certain directional terms used hereinafter to describe the drawings, such as "inner", "outer", "upper", "lower", and other directional terms, will be understood to have their normal meaning and refer to those directions as they relate to when the drawings are normally viewed. Unless otherwise indicated, the directional terms described herein are generally in accordance with conventional directions as understood by those skilled in the art.

The terms "first," "second," and the like as used herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.

Referring to fig. 1-21, the present invention provides a circuit breaker 1, especially provides an universal circuit breaker 1, and this circuit breaker 1 includes release 4, operating device 3, interlock protection mechanism 2, moving contact and static contact etc. The operating mechanism 3 comprises a switching-off half shaft connecting rod 30, a switching-off half shaft 32, a switching-off buckle piece 34 and the like. As shown in fig. 1, 16 and 20, the circuit breaker 1 further includes an operating mechanism having a frame defining an accommodating space, the frame having a pair of support plates opposed to each other, on which respective components of the operating mechanism can be arranged. The opening half-shaft link 30, the opening half-shaft 32 and the opening buckle piece 34 are mounted on the outer side of one of the support plates of the frame, specifically on the side close to the circuit breaker. The circuit breaker 1 further comprises a mounting plate 5 positioned and mounted on a support plate of the frame, in particular on one side of the support plate on which the opening half shaft 32 is mounted, the mounting plate 5 being used for mounting the trip 4. Referring to fig. 3, 5, 20 and 21, the opening half-shaft link 30 and the opening half-shaft 32 are both rotatable relative to the support plate, and one end of the opening half-shaft link 30 always abuts against the opening half-shaft 32. The opening half shaft 32 rotates under the actuation of the opening half shaft connecting rod 30 to further link an opening buckle piece 34 arranged on the outer side of the other supporting plate, the opening buckle piece 34 can link the connecting rod, and the connecting rod is connected to the movable contact, so that the action of the opening half shaft connecting rod 30 can be transmitted to the movable contact, the breaking and the connection of the movable contact and the fixed contact are directly reflected as the opening and closing of the circuit breaker 1, and a user can control the operating mechanism 3 according to the requirement to enable the circuit breaker 1 to be in the opening or closing state.

As shown in fig. 3, 5, 7-8, 21, the interlock protection mechanism 2 is mounted on a mounting plate 5 for mounting the trip unit 4. The interlock protection mechanism 2 is located partly on the side of the mounting plate 5 facing the maintenance person (user) and partly across the mounting plate 5 on the side facing away from the user, i.e. the side of the mounting plate 5 facing the operating mechanism 3. Referring to fig. 2 and 3, when the release 4 is mounted on the mounting plate 5, the interlock protection mechanism 2 is forced to be in the rest state by the force of the release 4, at this time, no action is generated between the interlock protection mechanism 2 and the operating mechanism 3, and the closing or opening state of the operating mechanism 3 is not affected by the interlock protection mechanism 2. When the release 4 needs to be replaced, referring to fig. 5, 8, 18 and 20, since the release 4 is separated from the mounting plate 5 and releases the interlocking protection mechanism 2, the interlocking protection mechanism 2 acts to force the operating mechanism 3 which is originally in the closing state to be switched to the opening state, so that the situation that a maintainer gets an electric shock or a more serious accident is avoided during the replacement of the release 4 due to the fact that the circuit breaker 1 is in the closing state and the power distribution system is accidentally electrified.

As described above, referring to fig. 1, the interlock protection mechanism 2 is a mechanism provided by the present invention between the operating mechanism 3 and the trip unit 4 of the circuit breaker 1. The interlock protection mechanism 2 is a mechanism capable of performing a function of automatically opening the circuit breaker 1 (e.g., an unexpectedly closed circuit breaker 1) and preventing the circuit breaker 1 from being reclosed in the first state when the tripper 4 is disengaged from the circuit breaker 1, and releasing the opening when the tripper 4 is engaged (reinstalled) with the circuit breaker 1 in the second state, without affecting/interfering with the opening or closing of the circuit breaker 1 when the tripper 4 is engaged with the circuit breaker 1 in the second state. The second state in which the trip unit 4 engages the circuit breaker 1 includes the following two conditions: first, the trip unit 4 is always installed on the circuit breaker 1 without undergoing a replacement operation, and in this case, no matter the circuit breaker 1 is in a closing/opening state (according to a use requirement), the interlock protection mechanism 2 is not actuated, and thus, the state of the circuit breaker 1 is not affected (as shown in fig. 3); secondly, the circuit breaker 1 goes through the process of replacing the release 4, after a new release 4 is installed on the circuit breaker 1, the interlock protection mechanism 2 goes through actuation to make the circuit breaker 1 in the opening state, and after the release 4 is installed and the interlock protection mechanism 2 is reset, the interlock protection mechanism will not affect the circuit breaker 1 in the opening state (as shown in fig. 21). Unless otherwise noted, the second (i.e., reinstallation of the trip unit 4) condition is generally the primary condition in describing the operation of the interlock protection mechanism 2 in the second state.

Referring to fig. 3, 5, 15 and 21, the interlocking mechanism includes a link member 20 and a reset member 22. The linkage 20 is disengaged from the contact release 4 in the first state, and under the releasing action of the reset member 22, the linkage 20 is forced to rotate so as to unlock the operating mechanism 3, so that the circuit breaker 1 is switched from closing to opening and the operating mechanism 3 of the circuit breaker 1 is ensured to be kept in the unlocking state. The linkage 20 contacts the release 4 in the second state, at this time, the linkage 20 is forced by the release 4 to charge the reset 22, the linkage 20 releases the actuation of the operating mechanism 3, but the operating mechanism 3 does not generate new state change, so that the linkage 20 in the second state does not affect the closing or opening of the circuit breaker 1.

As shown in fig. 8 and 10-13, the linkage 20 includes a shaft 200, a first push rod 201 and a second push rod 202. The first push rod 201 and the second push rod 202 are respectively connected to two ends of the shaft rod 200. The shaft 200 is mounted on the mounting plate 5 on which the trip unit 4 is mounted, in particular, the shaft 200 is located on the side of the mounting plate 5 facing the user. As shown in fig. 2 and 7, a cover plate 24 is attached to the surface of the shaft 200, positioning holes are provided at both ends of the cover plate 24, and the shaft 200 is fixed on the mounting plate 5 by the engagement (such as screw fixation, but not limited thereto) of the cover plate 24 and the mounting plate 5. As shown in fig. 2 and 5, the first push rod 201 is mainly located on the side facing the user, the second push rod 202 penetrates the mounting plate 5, and the first push rod 201 and the second push rod 202 are respectively located on the inner side and the outer side of the mounting plate 5. The inner side of the mounting plate 5 refers to one side of the defined inner space. The first push rod 201 is in a free state in a first state (i.e., the release 4 is separated from the circuit breaker 1), and is biased by the release 4 to rotate and interlock the shaft 200 to rotate in a second state. Referring to fig. 5, fig. 20-21, the second push rod 202 is linked by the first push rod 201 in the first state to unlock the actuating mechanism 3 (i.e. trigger the opening operation of the circuit breaker 1), and is reset in the second state to disengage the actuating mechanism 3, and the reset of the interlock protection mechanism 2 does not affect the actuating mechanism 3, i.e. the actuating mechanism 3 remains in the opening state of the circuit breaker 1 unless the user operates the circuit breaker 1 again to close. Under the condition that the circuit breaker 1 is switched on and the release 4 is installed on the circuit breaker 1, a certain distance exists between the interlocking protection mechanism 2, particularly the second push rod 202, and the opening half-shaft connecting rod 30 to ensure that the interlocking protection mechanism 2 cannot cause the circuit breaker 1 to be opened due to accidental vibration. The distance is preferably around 2 mm, which allows a deviation of ± 0.5 mm.

In a preferred embodiment, referring to fig. 13, the first and second pushrods 201 and 202 are arranged with an angle of 120 degrees relative to the shaft 200, which optionally may have a deviation of ± 5 degrees. It should be understood that the angle is only based on the suitable range provided by the existing structure, and is not used for limiting the present invention, and the structural improvement and the suitable adjustment of the angle by the skilled person based on the present invention do not depart from the protection scope of the present invention. As shown in fig. 10, the first push rod 201 and the second push rod 202 are arranged perpendicular to the shaft 200. The first and second push rods 201, 202 may be coupled to the shaft 200 by an interference fit. Referring to fig. 11, in order to make the shaft 200 fit with both more firmly, both ends of the shaft 200 may be provided with knurling 200 a. The design of the knurl 200a may provide a more secure fit of the shaft 200 and the two push rods 201, 202, which may stably maintain the interlock protection mechanism 2 in an active configuration. Of course, the knurls 200a are not limited to be provided only on the shaft 200, and the knurls 200a may be provided in the engaging holes of the first push rod 201 and the second push rod 202 which are sleeved on the shaft 200. Alternatively, the shaft 200 and the first and second push rods 201 and 202 may also cooperate with each other by way of ribs and grooves 202d to limit undesired rotation of the shaft 200 relative to both.

As shown in fig. 11-12, the first push rod 201 has a half-moon shape, and the second push rod 202 has an engaging portion 202a and an actuating portion 202 b. The joint 202a is flange-shaped and has a hollow joint hole, and the joint 202a is sleeved on the shaft rod 200. The actuating portion 202b extends at an angle relative to the engaging portion 202a, e.g., the actuating portion 202b extends perpendicular to the engaging portion 202a and in a direction of engaging the hole, which coincides with the extending direction of the shaft 200. The actuator 202b extends in a stepped manner in this direction, and this design can avoid the second push rod 202 from occupying a large space inside the circuit breaker 1 while achieving effective actuation/contact of the second push rod 202 with the operating mechanism 3 (particularly, the opening half link 30).

As described above, the operating mechanism 3 includes the opening half shaft 32 and the opening half link 30 associated with each other. Unless otherwise stated, the operating mechanism 3 according to the present application can be understood by referring to the structure of the conventional universal circuit breaker 1, and will not be described herein. The reset member 22 mentioned above may interlock the opening half link 30. That is, the reset member 22 actuates the second push rod 202 in the first state to move the second push rod 202 upward (as shown, upward movement can be understood as movement of the second push rod 202 toward the direction approaching the opening half link 30), the stepped front end of the actuating portion 202b of the second push rod 202 abuts against the opening half link 30 with the movement of the second push rod 202 and pushes the opening half link 30 until the engaging portion 202a of the second push rod 202 moves to abut against the mounting plate 5 of the mounting release 4, and the second push rod 202 stops moving due to the spatial limitation of the mounting plate 5. At this time, the joint 202a of the second push rod 202 has reached the final position of pushing the opening half shaft 32 (specifically, one end of the opening half shaft 32) upward, the other end of the opening half shaft 32 moves downward at the same time to press the opening half shaft link 30 to the final position, the opening half shaft link 30 immediately links the opening buckle piece 34, the opening buckle piece 34 actuates the movable contact through the link, and finally the separation of the movable contact and the fixed contact is realized, so as to realize the opening of the circuit breaker 1.

Return member 22 in the first state may move second push rod 202 upward based on the elastic potential energy accumulated once in the second state. The return member 22 may alternatively be a spring, such as a tension spring 220 or a torsion spring 222.

As shown in fig. 2 to 6, when the restoring member 22 is a tension spring 220, one end of the tension spring 220 is hooked on the mounting plate 5 (an opening for fixing the end of the tension spring 220 is provided on the mounting plate 5), and the other end of the tension spring 220 is hooked on the second push rod 202. The second push rod 202 may be provided with a reinforcing rib 202c in a radial direction, the reinforcing rib 202c is a rib extending along a length direction of the second push rod 202, and an opening may be formed in the rib for hooking an end of the tension spring 220. Preferably, the second push rod 202 is further provided with a groove 202d, and the groove 202d is arranged corresponding to the hook part at the end of the tension spring 220 to accommodate and position the tension spring 220, so as to avoid the tension spring 220 from moving relative to the second push rod 202 when the tension spring 220 pulls the second push rod 202. When the release 4 is removed, the tension spring 220 pulls the second push rod 202 to move upwards and actuate the opening half shaft link 30, so that the opening half shaft 32 is linked until the circuit breaker 1 is finally opened. When the tripper 4 is installed, the tripper 4 (specifically, the lug 40 on the side surface of the tripper 4) abuts against the first push rod 201 to force the first push rod 201 to displace, the first push rod 201 links with the shaft rod 200 to rotate and drives the second push rod 202 to move downwards (away from the opening half-shaft connecting rod 30), the second push rod 202 pulls the tension spring 220 to enable the tension spring 220 to be in a stretching state (at the moment, the tension spring 220 accumulates elastic potential energy), the second push rod 202 no longer contacts the opening half-shaft connecting rod 30, and the opening half-shaft connecting rod 30 is kept at the opening position.

As shown in fig. 15-20, when the restoring member 22 is a torsion spring 222, the torsion spring 222 is sleeved on the shaft rod 200 of the interlock protection mechanism 2. Specifically, the torsion spring 222 is sleeved on one end of the shaft rod 200 passing through the joint 202a of the second push rod 202. As shown in fig. 17, 19, and 20, the first leg 222a of the torsion spring 222 abuts against the second push rod 202 (the lower surface of the stepped front end of the actuating portion 202b of the second push rod 202), and the second leg 222b of the torsion spring 222 abuts against the mounting plate 5 on which the trip unit 4 is mounted. The mounting plate 5 is provided with an opening through which the second push rod 202 passes through the mounting plate 5 into the receiving space. The second leg 222b of the torsion spring 222 passes through the opening and abuts the edge of the opening. When the release 4 is removed, the torsion spring 222 pushes the second push rod 202 to move upwards and actuate the opening half-shaft link 30, so that the opening half-shaft 32 is linked until the circuit breaker 1 is finally opened. When the tripper 4 is installed, the tripper 4 pushes the first push rod 201 to displace against the first push rod 201, the first push rod 201 is linked with the shaft rod 200 to rotate and drive the second push rod 202 to move downwards (away from the opening half-shaft connecting rod 30), the first leg 222a of the torsion spring 222 sleeved on the shaft rod 200 is pressed downwards by the second push rod 202 (at the moment, the torsion spring 222 accumulates elastic potential energy), the second push rod 202 no longer contacts the opening half-shaft connecting rod 30, and the opening half-shaft connecting rod 30 is kept at the opening position.

The utility model discloses an above-mentioned interlocking protection mechanism that is used for between operating device of circuit breaker and the release ensures when the release breaks away from the circuit breaker, and the circuit breaker remains the separating brake state throughout to reduce because the maloperation makes the unexpected circular telegram of distribution system and lead to changing the electric shock risk that the maintainer of release probably faces, thereby provide good safe operational environment for the maintainer of circuit breaker.

While the invention has been described in detail in connection with only a limited number of embodiments, it should be readily understood that the invention is not limited to such disclosed embodiments. Rather, the invention can be modified by incorporating any number of variations, alterations, substitutions or equivalent arrangements not heretofore described, but which are commensurate with the spirit and scope of the invention. Additionally, while various embodiments of the invention have been described, it is to be understood that aspects of the invention may include only some of the embodiments. Accordingly, the invention is not to be seen as limited by the foregoing description, but is only limited by the scope of the appended claims.

List of reference numerals

1-breaker 220-extension spring

2-interlock protection 222-torsion spring

20-linkage 222 a-first leg

200-shaft 222 b-second leg

200 a-knurled 24-cover plate

201 first push rod 3 operating mechanism

202-second push rod 30-opening half shaft connecting rod

202 a-joint 32-opening half shaft

202 b-actuating part 34-opening buckle

202 c-Rib 4-Release

202 d-groove 40-bump

22-reset piece 5-mounting plate.

Claims (10)

1. An interlock protection mechanism (2) for a circuit breaker (1), the interlock protection mechanism (2) linking an operating mechanism (3) of the circuit breaker (1) with a release (4) and being structured to trip the circuit breaker (1) and to be able to prevent reclosing of the circuit breaker (1) in a first state in which the release (4) is disengaged from the circuit breaker (1) and not interfere with the tripping or closing of the circuit breaker (1) in a second state in which the release (4) is engaged with the circuit breaker (1), the interlock protection mechanism (2) comprising:

a linkage (20), the linkage (20) being structured to disengage the trip unit (4) and actuate the operating mechanism (3) to unlock the operating mechanism (3) in the first state, thereby opening the circuit breaker (1) and ensuring that the operating mechanism (3) is always in the unlocked state in the first state, and to be biased by the trip unit (4) to release the actuation of the operating mechanism (3) in the second state, the operating mechanism (3) maintaining opening or closing of the circuit breaker (1);

a reset member (22), said reset member (22) being configured to be released in said first state to cause said linkage member (20) to actuate said operating mechanism (3) and to ensure that said operating mechanism (3) is in an unlocked state, and to be recharged by said linkage member (20) in said second state.

2. The interlock protection mechanism (2) of claim 1 wherein said linkage (20) comprises:

a shaft (200);

a first push rod (201), wherein the first push rod (201) is connected to one end of the shaft rod (200) and is structured to be released in a first state and biased by the release (4) and drive the shaft rod (200) to rotate in a second state;

a second push rod (202), the second push rod (202) being connected to the other end of the shaft (200) and configured to actuate the operating mechanism (3) to unlock in a first state and disengage the operating mechanism (3) to enable locking in a second state.

3. The interlock protection mechanism (2) according to claim 2,

the shaft lever (200) is fixed on a mounting plate (5) for mounting the release (4);

the first push rod (201) is positioned on the side of the mounting plate (5) facing the user;

the second push rod (202) passes through the mounting plate (5) and is located on the other side of the mounting plate (5) relative to the first push rod (201).

4. The interlocking protection mechanism (2) according to claim 2, characterized in that the operating mechanism (3) comprises an opening half-shaft (32) and an opening half-shaft link (30) associated with each other; the reset piece (22) is configured to actuate the second push rod (202) to move upwards to push the opening half-shaft connecting rod (30) in a first state, and the opening half-shaft connecting rod (30) presses against the opening half-shaft (32) to unlock the operating mechanism (3), so that the circuit breaker (1) is opened.

5. The interlock protection mechanism (2) according to claim 4, wherein the reset member (22) is configured as a tension spring (220), one end of the tension spring (220) is fixed to a mounting plate (5) on which the trip unit (4) is mounted, and the other end of the tension spring (220) is fixed to the second push rod (202).

6. The interlock protection mechanism (2) of claim 4 wherein said reset member (22) is configured as a torsion spring (222), said torsion spring (222) is sleeved at one end of said shaft (200) engaging said second push rod (202), a first leg (222a) of said torsion spring (222) abuts against said second push rod (202), a second leg (222b) of said torsion spring (222) abuts against a mounting plate (5) mounting said trip unit (4) and extends from a side of said mounting plate (5) facing a user into another side of said mounting plate (5).

7. The interlock protection mechanism (2) according to claim 2, wherein the first push rod (201) and the second push rod (202) are configured to be arranged at an angle of 120 degrees to each other.

8. The interlock protection mechanism (2) according to claim 2,

the first push rod (201) is configured in a half moon shape;

the second push rod (202) comprises an engaging portion (202a) and an actuating portion (202b), the engaging portion (202a) is sleeved on the shaft (200) and extends in the radial direction, and the actuating portion (202b) extends outwards at an angle relative to the shaft (200);

the first push rod (201) and the second push rod (202) are coupled to the shaft (200) by an interference fit.

9. The interlock protection mechanism (2) according to claim 2, wherein a reinforcing rib (202c) is arranged on a circumferential surface of the second push rod (202), the reinforcing rib (202c) extending along a length of the second push rod (202).

10. A circuit breaker (1), characterized in that the circuit breaker (1) comprises an interlocking protection mechanism (2), a movable contact and a fixed contact according to any one of claims 1-9, wherein the interlocking protection mechanism (2) actuates the operating mechanism (3) to break the movable contact and the fixed contact when in a first state, so as to open the circuit breaker (1), and the interlocking protection mechanism (2) deactivates the operating mechanism (3) to maintain the opening or closing of the circuit breaker (1) when in a second state.

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