CN216749787U - Residual current operated circuit breaker and tripping rod and tripping force amplifying mechanism thereof - Google Patents
Residual current operated circuit breaker and tripping rod and tripping force amplifying mechanism thereof Download PDFInfo
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- CN216749787U CN216749787U CN202123255836.0U CN202123255836U CN216749787U CN 216749787 U CN216749787 U CN 216749787U CN 202123255836 U CN202123255836 U CN 202123255836U CN 216749787 U CN216749787 U CN 216749787U
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Abstract
The utility model discloses a residual current operated circuit breaker and trip bar and tripping force mechanism of enlargiing thereof. A trip bar includes an end portion, two arms, and a contact portion. The end portion is intended to be rotatably connected to a base of a residual current operated circuit breaker, the two arms extending from the end portion in two different directions on a plane perpendicular to an axis of rotation defined by the rotation of the end portion with respect to the base, the contact portion being intended to come into contact with a resilient element in the residual current operated circuit breaker. A trip force amplifying mechanism including the trip bar and a residual current operated circuit breaker including the trip force amplifying mechanism are also disclosed. According to the utility model discloses a residual current operated circuit breaker and subassembly simple structure is enlargied to tripping force thereof, easily manufacturing and maintenance, low cost to can enlarge the tripping force that produces by the release.
Description
Technical Field
The utility model relates to an electrical apparatus safety field generally to concretely relates to residual current operated circuit breaker field.
Background
In order to ensure the safety of power utilization and avoid casualties and equipment damage caused by electric leakage in the power utilization process, an electronic residual current operated circuit breaker (RCBO) is often used. When there is residual current in the circuit (i.e. which may correspond to a person's contact), the transformer of the residual current operated circuit breaker detects the residual current signal and transmits it to the PCBA so that the trip is actuated to produce a tripping force which, via transmission, pushes the earth leakage protection mechanism to trip the residual current operated circuit breaker to break down, thereby achieving person protection. Since a trip generated by a trip unit of a residual current operated circuit breaker is easily influenced by an environment and is unstable, it is necessary to increase a value of a trip force generated by the trip unit in order to secure a trip force actually applied to a trip operation, thereby improving safety of a product.
Fig. 1 shows a commercially available, conventional push-button residual current operated circuit breaker 100, which includes a trip unit 110, a latch 120, a push button 130, and a Miniature Circuit Breaker (MCB) connector 140. In use, in response to actuation of the trip unit 110, a tripping force 192 is applied to one end of the latch 120 (the left end in fig. 1) and is transmitted through the latch 120 and to the miniature circuit breaker connector 140 at the other end of the latch 120 (the right end in fig. 1) to trigger the tripping action of the residual current operated circuit breaker 100. The residual current operated circuit breaker 100 is simple in construction and easy to manufacture, but the actual tripping force 194 applied to the tripping action (i.e., to the miniature circuit breaker connector 140) is substantially equal to the tripping force 192 generated by the trip unit 110 (typically, all about 3N), which does not amplify the tripping force generated by the trip unit 110, requiring the trip unit 110 to generate a large tripping force.
Some residual current operated circuit breakers incorporate an amplification mechanism for the tripping force generated by the trip unit, but are complex in structure and use many parts, resulting in high manufacturing and maintenance costs. For example, fig. 2 shows a residual current operated circuit breaker 200 with a tripping force amplifying mechanism, which is complicated in structure and uses many parts. Fig. 3 shows a residual current operated circuit breaker 300 with a tripping force amplifying mechanism in chinese patent application publication CN 110676131 a. As shown, it transmits and amplifies the trip force generated by the push rod 310 through a lever 330, a main torsion spring 340, a sub torsion spring 350, a first torsion arm 360, a second torsion arm 370, etc., which are engaged with each other between the push rod 310 and the button 320 of the trip. The method needs to manufacture parts with complex structures, and the parts are complex to assemble, high in manufacturing cost and low in yield. A
Accordingly, there is a need for a residual current operated circuit breaker and assembly thereof having a trip force amplifying mechanism, which is simple in structure, easy to manufacture and maintain, and low in cost.
SUMMERY OF THE UTILITY MODEL
In order to provide a residual current operated circuit breaker and subassembly thereof that have amplification mechanism, simple structure, easily make and maintain and low cost, provide the utility model discloses.
According to an aspect of the utility model, a trip bar for residual current operated circuit breaker is provided, it includes: an end portion for rotatably connecting with a base of a residual current operated circuit breaker; two arms extending from the end portion in two different directions on a plane perpendicular to an axis of rotation defined by rotation of the end portion relative to the base; and a contact portion for contacting with an elastic member in the residual current operated circuit breaker.
In the trip lever as described above, the end portion includes a through hole or a blind hole extending along the rotation axis.
In a trip bar as claimed in any one of the preceding claims, the contact portion comprises a cylinder projecting from a surface of the trip bar in the direction of the axis of rotation.
According to the utility model discloses an on the other hand provides a residual current operated circuit breaker's tripping force mechanism of amplifying, and it includes: a trip bar as claimed in any preceding claim, wherein one arm of the trip bar is arranged to receive a trip force generated by a trip unit of a residual current operated circuit breaker; a latch for rotatably connecting with a base of the residual current operated circuit breaker and for contacting with a button of the residual current operated circuit breaker; at least one part of the locking elastic element is used for limiting the base and applying elastic force to the tripping rod and the lock catch; and a trip resilient member, at least a portion of which is adapted to be retained by the base and to exert a resilient force on a portion of the base and the button, wherein the trip resilient member is further adapted to trigger a trip action of the residual current operated circuit breaker in response to the latch disengaging the button.
In the above-mentioned tripping force amplifying mechanism, the tripping elastic element is used for applying an elastic force to the miniature circuit breaker connector of the residual current operated circuit breaker in response to the latch release button, so as to trigger the tripping action of the residual current operated circuit breaker.
In the above-described release-force amplifying mechanism, the lock comprises: an end portion for rotatably connecting with a base of a residual current operated circuit breaker; a first arm and a second arm extending from the end of the latch in two different directions on a plane perpendicular to an axis of rotation defined by the rotation of the end of the latch relative to the base, and for engaging the other arm of the trip bar and the push button, respectively; and a contact portion for contacting the latch elastic member.
In the above-described trip force amplifying mechanism, the latch further includes a third arm extending from the end of the latch to a different direction from the first and second arms on a plane perpendicular to a rotation axis defined by the rotation of the end of the latch with respect to the base, wherein a trip resilient member is connected to the third arm to apply a resilient force to the third arm in response to the latch release button to actuate the third arm to drive the miniature circuit breaker connector of the residual current operated circuit breaker to trigger the trip action of the residual current operated circuit breaker.
In the above-described tripping force amplifying mechanism, the micro breaker connector of the residual current operated circuit breaker is formed integrally with the micro breaker of the residual current operated circuit breaker, or formed integrally with the latch.
The release-force amplifying mechanism according to any one of the above, wherein the contact portion of the lock catch comprises a cylinder protruding from a surface of the lock catch in a direction of a rotation axis defined by rotation of an end of the lock catch relative to the base.
The release force amplifying mechanism according to any one of the above claims, the latch resilient member comprising a latch torsion spring comprising: the lock catch winding coil is used for limiting the position of the lock catch on the base; and two lock catch torsion arms which extend towards two different directions at two ends of the lock catch winding coil respectively and are used for applying elastic force to the tripping rod and the lock catch respectively.
The trip force amplifying mechanism according to any one of the above claims, the trip resilient member comprising a trip torsion spring including: the tripping winding coil is used for limiting the position of the base; and a first trip torsion arm and a second trip torsion arm extending in two different directions at two ends of the trip winding coil, respectively, wherein the first trip torsion arm is used for applying an elastic force to a part of a base of the residual current operated circuit breaker, and the second trip torsion arm is used for applying an elastic force to the button and for applying an elastic force to trigger a trip action of the residual current operated circuit breaker in response to the latch disengaging the button.
According to another aspect of the present invention, there is provided a residual current operated circuit breaker, comprising: a base; a housing defining an interior space with a base; an electric leakage detection mechanism in the internal space; a release within the interior space and electrically coupled to the leakage detection mechanism for generating a release force in response to receiving a leakage indication signal from the leakage detection mechanism; a release force amplification mechanism as claimed in any one of the preceding claims for receiving a release force and generating an amplified release force; a button, at least a portion of which is within the interior space, wherein the button snaps with the trip force amplification mechanism in a depressed position and disengages the trip force amplification mechanism in an ejected position; and a miniature circuit breaker connector for being actuated in response to the button being disengaged from the tripping force amplifying mechanism so as to trigger a tripping action of the residual current operated circuit breaker.
As described above, in the residual current operated circuit breaker, one arm of the trip lever of the trip force amplifying mechanism is in contact with the trip force applying portion of the trip, one end of the button in the inner space is caught and or disengaged with one arm of the latch of the trip force amplifying mechanism, the trip elastic member is for applying an elastic force to the miniature circuit breaker connector in response to the button being disengaged from the trip force amplifying mechanism to directly trigger the trip action of the residual current operated circuit breaker, or for applying an elastic force to the trip force amplifying mechanism in response to the button being disengaged from the trip force amplifying mechanism to actuate the trip force amplifying mechanism to trigger the trip action of the residual current operated circuit breaker, and the miniature circuit breaker connector is integrally formed with the miniature circuit breaker of the residual current operated circuit breaker, or is integrally formed with the latch.
According to the utility model discloses a residual current operated circuit breaker and subassembly simple structure is enlargied to tripping force thereof, easily manufacturing and maintenance, low cost to can enlarge the tripping force that produces by the release.
Drawings
Various advantages of the embodiments will become apparent to those skilled in the art upon reading the following specification and by referring to the following drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts.
Fig. 1 shows a commercially available, conventional push-button residual current operated circuit breaker.
Fig. 2 shows a prior art residual current operated circuit breaker with a tripping force amplifying mechanism.
Fig. 3 shows another prior art residual current operated circuit breaker with a tripping force amplifying mechanism.
Fig. 4 shows a trip bar for a residual current operated circuit breaker according to an embodiment of the present invention.
Fig. 5 shows the base of the residual current operated circuit breaker when no components have been installed.
Fig. 6 shows a trip force amplifying mechanism and a residual current operated circuit breaker including the same according to an embodiment of the present invention.
Fig. 7 shows a trip unit usable with a residual current operated circuit breaker according to an embodiment of the present invention.
Fig. 8 shows an operation process of the tripping force amplifying mechanism of the residual current operated circuit breaker according to the embodiment of the present invention when the button is in the pressed state and the bounce state.
Fig. 9 shows a force diagram of the tripping force amplifying assembly in the residual current operated circuit breaker according to the embodiment of the present invention.
Detailed Description
Non-limiting examples of the invention are described below in connection with the examples.
As used in this application, the phrase "for" means that the element so described is capable of performing the action or is in the state so described, but not necessarily that the action is being performed or is in the state. For example, elements or components may be manufactured or sold separately, and available for incorporation (e.g., assembly) into a larger system; but which elements or components do not perform operations associated with, nor are they in a state associated with, the larger system (or components thereof) prior to being incorporated into the larger system.
According to an aspect of the present invention, there is provided a trip bar for a residual current operated circuit breaker.
Fig. 4 shows a trip bar 400 for a residual current operated circuit breaker according to an embodiment of the present invention.
The arms 420 and 430 may extend in two different directions from the end portion 410 in a plane perpendicular to an axis of rotation defined by rotation of the end portion 410 relative to the base of the residual current operated circuit breaker.
The trip bar 400 may further comprise a contact portion 440 for contacting a resilient member of a cooperating residual current operated circuit breaker. In some embodiments, contact 440 may comprise a post protruding from a surface of trip bar 400. In some embodiments, as shown in fig. 4, the contact 440 may comprise a cylinder (e.g., a circular cylinder) that protrudes from the surface of the trip bar 400 in a direction perpendicular to the plane of the paper (thus, the contact 440 is shown in phantom in fig. 4). In some embodiments, the contact portion 440 may comprise a cylinder that protrudes from the surface of the trip bar 400 in a direction perpendicular to the plane of the paper. In some embodiments, as shown in fig. 4, contact 440 may be located on the connection portion of trip bar 400 between end 410, arm 420, and arm 430. In other embodiments, the contact 440 may also be located on the end 410 or on one of the arms 420 or 430.
According to the utility model discloses a trip bar 400 simple structure, easily make and maintain and low cost to can amplify the tripping force that the release produced when using with other dropout actuating element cooperation of residual current operated circuit breaker. This will be further reflected by the examples described below.
According to another aspect of the present invention, there is provided a trip force amplifying mechanism for a residual current operated circuit breaker and a residual current operated circuit breaker including the same.
Fig. 5 shows a base 500 of a residual current operated circuit breaker when no components have been installed. A tripping force amplification mechanism according to an embodiment of the present invention may be mounted or housed on this base 500. Base 500 may include a region 510 for mounting a trip unit, a region 520 for mounting a button. The chassis 500 may further include an interface 530 for connection with a trip bar, an interface 540 for connection with a latch, an interface 550 for connection with a trip resilient element and a latch resilient element, and a structure 560 for limiting the trip resilient element (the trip bar, the latch, the trip resilient element, and the latch resilient element are elements that constitute a trip force amplifying mechanism according to an embodiment of the present invention, which will be described in further detail below in conjunction with fig. 6). As shown in fig. 5, the interface 530 may include a cylinder protruding from a surface of the base 500. However, depending on the particular configuration of the trip bar with which it is mated, the interface 530 may also be a hollow structure such as that shown by interface 540. As shown in fig. 5, the interface 540 may include a hollow structure extending from a surface of the base 500. However, depending on the particular configuration of the latch with which it is mated, the interface 540 may also be a raised cylinder like the interface 530. As shown in fig. 5, the interface 550 may include a cylinder protruding from a surface of the base 500. The base 500 also includes an arcuate through slot 570 for passage of the miniature circuit breaker connector and constraining its path of movement.
Fig. 6 illustrates a trip force amplifying mechanism and a residual current operated circuit breaker 600 incorporating the same according to embodiments of the present invention. The various components of the residual current operated circuit breaker 600 of figure 6 may be mounted or housed on the base 500 shown in figure 5. For clarity, only reference numerals of the base 500 are shown in fig. 6 and reference numerals of other components of the base 500 are not shown.
The residual current operated circuit breaker 600 may comprise a base 500 and a housing (not shown), the base 500 and the housing together defining an interior space of the residual current operated circuit breaker 600 for mounting or accommodating various components of the residual current operated circuit breaker 600. The residual current operated circuit breaker 600 may include an electrical leakage detection mechanism (not shown) located in the interior space, a trip 610, a trip force amplification mechanism, a button 620 and a miniature circuit breaker connector 630.
The leakage detection mechanism is used to detect a leakage event in a loop to which the residual current operated circuit breaker 600 is connected. In some embodiments, the leakage detection mechanism may include a zero sequence current transformer for detecting phase-to-phase imbalance of current in the loop and outputting a signal indicative of the occurrence of a leakage event in response to detecting phase-to-phase current imbalance greater than a threshold.
The trip unit 610 may be electrically coupled to a leakage detection mechanism for generating a tripping force in response to receiving a signal indicative of a leakage event from the leakage detection mechanism. In the embodiment shown in fig. 5, trip 610 generates a trip force with its jack to the right in response to receiving a signal indicative of a leakage event. The structure and operation of the trip unit 610 will be further described below in conjunction with fig. 7.
The button 620 is used to indicate the operational state of the residual current operated circuit breaker 600 and to reset the residual current operated circuit breaker 600 after the residual current operated circuit breaker 600 is actuated in response to the detection of a leakage event. Specifically, the button 620 is in a depressed state (i.e., the state shown in fig. 6) when the residual current operated circuit breaker 600 is operating normally. At this time, since the button 620 is engaged with the element of the trip force amplifying mechanism at one end of the internal space of the residual current operated circuit breaker 600, the trip force generated from the trip unit 610 can be transmitted to trigger the trip operation. When the trip unit 610 generates a trip force in response to detecting an electrical leakage event, the trip force is transmitted through a trip force amplification mechanism to act on the button 620 to cause the button 620 to pop out to an eject position. At this time, the button 620 is disengaged from the element of the tripping force amplifying mechanism at one end of the internal space of the residual current operated circuit breaker 600, so that even if the tripping force is generated again by the tripper 610, a sufficient force cannot be transmitted to trigger the tripping operation, and thus the button 620 must be pressed first to reset the residual current operated circuit breaker 600 to ensure the normal operation thereof.
The miniature circuit breaker connector 630 may be used to receive a trip force transmitted or amplified by the trip force amplifying mechanism to trigger a trip action of the residual current operated circuit breaker 600. In some embodiments, the miniature circuit breaker connector 630 may be integrally formed with (i.e., be an integral part of) the miniature circuit breaker of the residual current operated circuit breaker 600. In other embodiments, the miniature circuit breaker connector 630 may also be integrally formed with (i.e., be an integral part of) the latch 650 of the trip-force amplifying mechanism 500.
The trip force amplification mechanism may be placed on the base 500 through corresponding interfaces and structures (see also fig. 5) on the base 500 and in contact with the trip unit 610, the button 620, and the miniature circuit breaker connector 630. The trip force amplification mechanism may receive the trip force generated by the trip unit 610 and transmit the trip force through interaction between its components and with other components of the residual current operated circuit breaker 600 and generate an amplified trip force at the miniature circuit breaker connector 630.
The trip force amplifying mechanism may include a trip bar 640, a latch 650, a latch resilient member 660, and a trip resilient member 670.
The trip bar 640 may be similar to the trip bar 400 described above in connection with fig. 4. Trip lever 640 may include an end 641 and arms 642 and 643. The end 641 may be adapted to be rotatably coupled to a base 500 of a cooperating residual current operated circuit breaker 600. In some embodiments, the end 641 may be a through hole in a direction perpendicular to the base 500 of the residual current operated circuit breaker 600, through which a raised cylindrical structure on the base 500 of the residual current operated circuit breaker 600 may pass, such that the end 641 may rotate about an axis defined by the cylindrical structure. In some embodiments, the end 641 may be a blind hole in a direction perpendicular to the base 500 of the residual current operated circuit breaker 600, into which a raised cylindrical structure on the base 500 of the residual current operated circuit breaker 600 may extend, such that the end 641 may rotate about an axis defined by the cylindrical structure. Alternatively, in this embodiment, the configurations on the end 641 and on the base 500 of the residual current operated circuit breaker 600 may be interchanged, i.e. the end 641 comprises a cylinder convex in the direction of said axis, while the base 500 of the residual current operated circuit breaker 600 may comprise a hollow structure able to cooperate with it. Other implementations of the rotatable connection of the two may also be realized by those skilled in the art.
The arms 642 and 643 may extend from the end 641 in two different directions on a plane perpendicular to an axis of rotation defined by the rotation of the end 641 with respect to the base 500 of the residual current operated circuit breaker 600. Arm 642 can be used to contact an element of trip force output of trip unit 610 (e.g., a jack) for receiving the trip force generated by trip unit 610.
The trip lever 640 may further comprise a contact portion (not shown, see also fig. 4) for contacting a latch resilient element 660 of a cooperatively used residual current operated circuit breaker 600. In some embodiments, the contact portion may comprise a post protruding from a surface of the trip bar 640. In some embodiments, the contact portion may comprise a cylinder (e.g., a cylinder) projecting from the surface of the trip bar 640 in a direction perpendicular to the plane of the paper. In some embodiments, the contact portion may comprise a post projecting from the surface of the trip bar 640 in a direction perpendicular to the plane of the paper. In some embodiments, a contact portion may be located on the connecting portion of trip lever 640 between end 641, arm 642, and arm 643. In other embodiments, the contact portion may also be located on the end 641 or on one of the arms 642 or 643.
In the embodiment shown in fig. 6, latch 650 may include end 651 and arms 652, 653, 654. In other embodiments, the latch 651 can include arms 652, 653 (i.e., no third arm is included). The end portion 651 may be adapted to be rotatably connected to the base 500 of a cooperating residual current operated circuit breaker 600. The structure of the end portion 651 and the particular manner of connection thereof to the base 500 of the residual current operated circuit breaker 600 may be similar to that described above for the end portion 641.
In the embodiment shown in fig. 6, the arms 652, 653, 654 may extend in three different directions from the end 651 on a plane perpendicular to an axis of rotation defined by the rotation of the end 651 relative to the base 500 of the residual current circuit breaker 600. The arm 652 may be in contact with an arm 643 of the trip lever 640 for receiving a trip force transmitted by the trip lever 640. The arm 653 may engage the end of the button 620 that is within the interior of the residual current operated circuit breaker 600 when the button 620 is in the depressed state and disengage the end of the button 620 that is within the interior of the residual current operated circuit breaker 600 when the button 620 is in the sprung state. The arm 654 may contact the miniature circuit breaker connector 630 to transfer the received tripping force to the miniature circuit breaker connector 630 to trigger a trip action. In embodiments where the latch 650 includes only the arms 652, 653, the trip force amplification mechanism may not be in contact with the miniature circuit breaker connector 630. The latch 650 may further comprise a contact portion 655 for contacting a latch resilient element 660 of the residual current operated circuit breaker 600 in use. In some embodiments, the contact portion may comprise a post protruding from a surface of the trip bar 640. In some embodiments, the contact portion may comprise a cylinder (e.g., a cylinder) projecting from the surface of the trip bar 640 in a direction perpendicular to the plane of the paper. In some embodiments, the contact portion may comprise a post projecting from the surface of the trip bar 640 in a direction perpendicular to the plane of the paper. Although in the embodiment shown in fig. 6, contact 655 is located on arm 653, in alternative embodiments, contact 655 may be located on other portions of latch 650, for example, arm 652, arm 654, or end 651.
At least a portion of the latch resilient element 660 may be retained on the base 500 of the residual current operated circuit breaker 600 and may exert a resilient force on the trip lever 640 and the latch 650. In one embodiment, the latch resilient element 660 may comprise a latch torsion spring. The shackle torsion spring may include a shackle winding coil and two shackle torsion arms extending to two different defensive lines at both ends of the shackle winding coil, respectively. The latch winding coil may be configured to be retained to the base 500 of the residual current operated circuit breaker 600. For example, as shown in fig. 6, the hollow portion of the latching winding coil may be sleeved on a raised cylinder on the base 500 of the residual current operated circuit breaker 600 (refer to fig. 5). Two latch torsion arms are used to apply a spring force to the trip bar 640 and the latch 650, respectively. In the embodiment shown in fig. 5, two latch torsion arms may contact the contact portion of the trip bar 640 and the contact portion 655 of the latch 650, respectively. Thus, when the arm 642 of the trip lever 640 rotates clockwise upon receiving a trip force from the trip unit 610, the contact portion of the trip lever 640 presses against the left latch torsion arm of the latch elastic member 660 to accumulate elastic potential energy in the latch elastic member 660, and transmits the elastic force to the contact portion 655 of the latch 650 through the right latch torsion arm by the accumulated elastic potential energy. As such, the latch 650 receives a resilient force transmitted by the latch resilient element 660 through the contact portion 655 in addition to receiving a trip force at the arm 652 from the arm 643 of the trip lever 640. In alternative embodiments, the latch resilient element 660 may take other forms. For example, an elastic sheet bent at an angle may be used.
In the embodiment shown in fig. 6, latch 650 includes arms 652, 653, and 654. At least a portion of the trip resilient member 670 may be retained on the base 500 of the residual current operated circuit breaker 600, and may apply a resilient force to a portion of the base 500 of the residual current operated circuit breaker 600, the button 620, and the latch 650. In embodiments where the latch 650 includes only the arms 652, 653, the trip resilient element 670 does not apply a resilient force to the trip force amplifying mechanism, but rather may apply a resilient force directly to the miniature circuit breaker connector 630. In one embodiment, the trip resilient member 670 may comprise a trip torsion spring. The tripping torsion spring can comprise a tripping winding coil and two tripping torsion arms which respectively extend to two different defense lines at two ends of the tripping winding coil. The trip winding coil may be used to restrain the base 500 of the residual current operated circuit breaker 600. For example, as shown in fig. 6, the hollow portion of the trip winding coil may be sleeved on a raised cylinder on the base 500 of the residual current operated circuit breaker 600 (refer to fig. 5). In the embodiment shown in fig. 6, the trip winding coil and the latch winding coil may be used for the same structure retained on the base 500 of the residual current operated circuit breaker 600, but in alternative embodiments, the two may be used for different structures retained on the base 500 of the residual current operated circuit breaker 600. In the embodiment shown in fig. 6, the left trip torsion arm is in contact with a structure on the base 500 of the residual current operated circuit breaker 600, while the right trip torsion arm is used to exert a spring force on the button 620 and latch 650. In the embodiment shown in fig. 5, the right trip twist arm may contact and pass through button 620 and connect at the right end with arm 654 of latch 650. As such, when the button 620 is in the pressed state, the trip elastic element 670 stores elastic potential energy; when the tripping force generated by the trip unit 610 is transmitted through the tripping force amplifying mechanism to make the button 620 disengage from the arm 653 of the latch 650 at one end of the internal space of the residual current operated circuit breaker 600, the elastic potential energy stored in the tripping elastic element 670 is released, on one hand, the released elastic force is ejected by the right arm driving button 620 of the tripping elastic element 670, on the other hand, the released elastic force is further applied to the arm 654 of the latch 650 through the right arm of the tripping elastic element 670, so that the arm 654 of the latch 650 obtains additional elastic force to trigger the tripping operation of the residual current operated circuit breaker 600. In embodiments where the latch 650 includes only the arms 652, 653, in response, the right arm of the trip resilient element 670 applies a resilient force directly to the miniature circuit breaker connector 630 to trigger a trip action of the residual current operated circuit breaker 600. In alternative embodiments, the trip resilient member 670 may take other forms of resilient members. For example, an elastic sheet bent at an angle may be used.
According to the utility model discloses a tripping force amplifying assembly is suitable for as residual current operated circuit breaker's component and residual current operated circuit breaker to make together and sell. In addition, due to the simple structure, good adaptability and easy installation, the tripping force amplifying assembly can be manufactured and sold separately and used for modifying or replacing corresponding assemblies in the existing commercial residual current operated circuit breaker.
According to the utility model discloses a subassembly is enlargied to tripping force and contains the residual current operated circuit breaker of this subassembly is enlargied to tripping force adopts simple structure, easily makes and maintains and low cost's component, exerts extra elastic force through tripping action in-process elastic element, compares the tripping force who produces from the release, has carried out the amplification to the actual trip action's of being used for that receives at miniature circuit breaker connector department tripping force.
Fig. 7 illustrates a trip unit 700 that may be used with a residual current operated circuit breaker according to an embodiment of the present invention. The trip unit 700 may be the trip unit 610 used in the residual current operated circuit breaker 600 shown in fig. 6.
The trip unit 700 may include a bobbin 710, an enamel wire 720, and a yoke 730. The enamel wire 720 may be wound outside the bobbin 710, and the yoke 730 may be disposed around the outer circumference of the enamel wire 720. The trip unit 700 may further include a stationary core 740, a movable core 750, a push rod 760, and a spring 770 positioned in the inner space defined by the bobbin 710. The stationary core 740 may be fixed to the bobbin 710. The plunger 760 may have one end connected to the plunger 750 and the other end extended to the outside of the bobbin 710 through the stationary core 740 and the bobbin 710. The spring 770 may be disposed between one end of the movable core 750 connected to the top bar 760 and an opposite end of the stationary core 740, and the spring 770 is in a compressed state such that the elastic force of the spring 770 urges the movable core 750 against the bobbin 710. In use, when the trip unit 700 detects a signal indicating an electrical leakage event from the electrical leakage detection mechanism, the movable iron core 750 and the stationary iron core 740 are rapidly magnetized to generate a magnetic attraction therebetween, which can counteract the elastic force of the spring 770, so that the movable iron core 750 is rapidly moved toward the stationary iron core 740, and the push rod 760 is rapidly driven to move toward the outside of the bobbin 710 to generate a trip force.
Fig. 8 shows an operation process of the tripping force amplifying mechanism of the residual current operated circuit breaker according to the embodiment of the present invention when the button is in the pressed state and the bounce state.
The schematic illustration 800 shows the situation when the button is in the pressed state. As described above in connection with fig. 6, when the release generates a tripping force, the latch is subjected to the tripping force transmitted by one arm of the trip bar, the elastic force exerted by the latch elastic member, and the elastic force exerted by the trip elastic member, so that only a small tripping force generated by the release is sufficient for the latch to actuate the miniature circuit breaker connector to trigger a tripping action.
In contrast, the schematic illustration 850 shows the situation when the button is in the sprung state. Since one end of the button in the interior space of the residual current operated circuit breaker disengages the corresponding arm of the latch (as shown at 851), at this time, when the trip release generates a trip force (as shown at 852), the trip force cannot be further transmitted through the trip force amplifying assembly to further trigger the trip action. To restore the normal operating condition, the button needs to be manually depressed so that its end in the interior space of the residual current operated circuit breaker engages the corresponding arm of the latch, i.e. is reset to the condition shown in the schematic diagram 800.
Fig. 9 shows a force diagram of the tripping force amplifying assembly in the residual current operated circuit breaker according to the embodiment of the present invention. The residual current operated circuit breaker shown in fig. 9 is the same as that shown in fig. 6, but for the sake of clarity only the relevant forces are marked in fig. 9, no reference numerals indicating the various elements are marked anymore.
As described above in connection with fig. 6, when the trip force is generated by the trip unit, the left arm of the trip bar may receive the trip force, as shown at 910, which may typically be about 0.7N in magnitude. The trip lever is driven to rotate clockwise by the trip force and presses with its right arm against the corresponding arm of the latch, thereby applying a force 920 to the latch, the force 920 being substantially the same magnitude as the force 910, and typically also being about 0.7N. The end of the button in the interior space of the residual current operated circuit breaker receives a supporting force 930 with a corresponding one of the arm catches of the latch, which force may typically be of the order of 5N. Meanwhile, the two clamps also receive friction force. The coefficient of friction may generally be about 0.1-0.15, and the friction force may typically be about 0.7N. That is, the latch 920 is driven by a force sufficient to overcome the above-mentioned friction force and to disengage one end of the button in the internal space of the residual current operated circuit breaker from a corresponding arm of the latch, so that the tripping elastic element releases the elastic potential energy to further apply the elastic force. In some embodiments, the tripping elastic element is in contact with the tripping force amplifying mechanism, and the tripping elastic element drives the tripping force amplifying mechanism to drive the miniature circuit breaker connector so as to trigger the tripping action of the residual current operated circuit breaker. In other embodiments, the trip resilient member is not in contact with the trip force amplifying mechanism, and therefore the trip resilient member directly applies a resilient force to the miniature circuit breaker connector to trigger a trip action of the residual current operated circuit breaker. Regardless of the configuration and manner of applying the spring force, ultimately, the force 940 applied to the miniature circuit breaker connector may typically be about 3N, which is sufficient to drive the trip action. It can be seen that with the trip force amplification mechanism according to embodiments of the present invention, the trip force generated by the trip unit can be amplified by a factor of 4-5, thereby reliably triggering a trip action when the trip force is generated in response to an electrical leakage event.
The embodiments of the present invention have been described in connection with the accompanying drawings, however, it will be appreciated by those skilled in the art that the descriptions herein are illustrative and not restrictive, and that the scope of the invention is defined by the appended claims.
Claims (13)
1. A trip bar for a residual current operated circuit breaker, comprising:
an end portion for rotatably connecting with a base of the residual current operated circuit breaker;
two arms extending from the end portion in two different directions on a plane perpendicular to an axis of rotation defined by rotation of the end portion relative to the base; and
a contact portion for contacting with a resilient element in the residual current operated circuit breaker.
2. Trip bar as claimed in claim 1, characterized in that the end portion comprises a through-hole or a blind hole extending along the axis of rotation.
3. The trip bar of claim 1, wherein the contact portion comprises a post projecting from a surface of the trip bar in the direction of the axis of rotation.
4. A trip force amplifying mechanism for a residual current operated circuit breaker comprising:
a trip bar as claimed in any one of claims 1 to 3, wherein one arm of the trip bar is arranged to receive a trip force generated by a trip unit of the residual current operated circuit breaker;
a latch for rotatably connecting with a base of the residual current operated circuit breaker and for contacting with a button of the residual current operated circuit breaker;
at least one part of the locking elastic element is used for limiting the base and applying elastic force to the tripping rod and the lock catch; and
a trip resilient element, at least a portion of the trip resilient element being adapted to be retained by the base and to exert a resilient force on a portion of the base and the button, wherein the trip resilient element is further adapted to trigger a trip action of the residual current operated circuit breaker in response to the catch disengaging the button.
5. The trip force amplifying mechanism according to claim 4, wherein said trip resilient member is adapted to apply a resilient force to a miniature circuit breaker connector of said residual current operated circuit breaker in response to disengagement of said latch from said button, thereby triggering a trip action of said residual current operated circuit breaker.
6. The release-force amplifying mechanism of claim 4, wherein the lock comprises:
an end portion for rotatably connecting with a base of the residual current operated circuit breaker;
a first arm and a second arm extending from an end of the latch in two different directions on a plane perpendicular to an axis of rotation defined by rotation of the end of the latch relative to the base, and for contacting the other arm of the trip bar and the button, respectively; and
a contact portion for contacting the latch elastic member.
7. The release-force amplifying mechanism of claim 6, wherein the latch further comprises a third arm extending from the end of the latch in a different direction than the first arm and the second arm on a plane perpendicular to an axis of rotation defined by rotation of the end of the latch relative to the base,
wherein the trip resilient element is coupled to the third arm to apply a resilient force to the third arm in response to the latch disengaging the button to actuate the third arm to drive the miniature circuit breaker connector of the residual current operated circuit breaker to trigger the trip action of the residual current operated circuit breaker.
8. The trip force amplifying mechanism according to any one of claims 5 to 7, wherein a miniature circuit breaker connector of the residual current operated circuit breaker is integrally formed with the miniature circuit breaker of the residual current operated circuit breaker or is integrally formed with the latch.
9. The release-force amplifying mechanism of claim 6, wherein the contact portion of the lock catch includes a post projecting from a surface of the lock catch in a direction of an axis of rotation defined by rotation of an end of the lock catch relative to the base.
10. The trip force amplifying mechanism according to claim 4,
the hasp elastic element includes the hasp torsional spring, the hasp torsional spring includes:
the lock catch winding coil is used for limiting the position of the lock catch winding coil on the base; and
and the two lock catch torsion arms extend towards two different directions respectively at two ends of the lock catch winding coil, and are used for applying elastic force to the tripping rod and the lock catch respectively.
11. The trip force amplifying mechanism according to claim 4,
the trip resilient member includes a trip torsion spring, the trip torsion spring including:
the tripping winding coil is used for limiting the base; and
and the two ends of the tripping winding coil respectively extend towards two different directions, wherein the first tripping torsion arm is used for applying elastic force to the part of the base of the residual current operated circuit breaker, and the second tripping torsion arm is used for applying elastic force to the button and responding to the lock catch separating from the button to apply elastic force so as to trigger the tripping action of the residual current operated circuit breaker.
12. A residual current operated circuit breaker, comprising:
a base;
a housing defining an interior space with the base;
an electric leakage detection mechanism in the internal space;
a release within the interior space and electrically coupled to the electrical leakage detection mechanism for generating a release force in response to receiving an electrical leakage indication signal from the electrical leakage detection mechanism;
a release force amplification mechanism according to any one of claims 4 to 11 for receiving the release force and generating an amplified release force;
a button, at least a portion of the button being within the interior space, wherein the button is engaged with the trip force amplification mechanism in a depressed position and disengaged from the trip force amplification mechanism in an ejected position; and
a miniature circuit breaker connector for being actuated in response to disengagement of said button from said trip force amplifying mechanism to trigger a trip action of said residual current operated circuit breaker.
13. The residual current operated circuit breaker according to claim 12,
one arm of the trip bar of the trip-force amplifying mechanism is in contact with a portion of the trip applying the trip force,
one end of the button in the inner space is engaged with or disengaged from one arm of the latch of the trip force amplifying mechanism,
the tripping elastic element is used for applying an elastic force to the miniature circuit breaker connector to directly trigger the tripping action of the residual current operated circuit breaker in response to the button being disengaged from the tripping force amplifying mechanism or applying an elastic force to the tripping force amplifying mechanism to drive the tripping force amplifying mechanism to trigger the tripping action of the residual current operated circuit breaker in response to the button being disengaged from the tripping force amplifying mechanism, and
the miniature circuit breaker connector is integrally formed with a miniature circuit breaker of the residual current operated circuit breaker, or integrally formed with the latch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123255836.0U CN216749787U (en) | 2021-12-21 | 2021-12-21 | Residual current operated circuit breaker and tripping rod and tripping force amplifying mechanism thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123255836.0U CN216749787U (en) | 2021-12-21 | 2021-12-21 | Residual current operated circuit breaker and tripping rod and tripping force amplifying mechanism thereof |
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| Publication Number | Publication Date |
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| CN216749787U true CN216749787U (en) | 2022-06-14 |
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| CN202123255836.0U Active CN216749787U (en) | 2021-12-21 | 2021-12-21 | Residual current operated circuit breaker and tripping rod and tripping force amplifying mechanism thereof |
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| CN (1) | CN216749787U (en) |
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