CN212750777U - Thermal tripping mechanism and circuit breaker - Google Patents

Abstract

The utility model discloses a hot tripping device and circuit breaker relates to circuit breaker technical field. The thermal tripping mechanism comprises a thermal deformation piece, a traction rod, a current conducting plate assembly and a plurality of locking assemblies which are electrically connected with the current conducting plate assembly respectively, wherein the plurality of locking assemblies are connected in sequence in a transmission mode, the thermal deformation piece is arranged on the current conducting plate assembly and is electrically connected with the current conducting plate assembly and the plurality of locking assemblies respectively, the traction rod is connected with any one of the thermal deformation piece and the plurality of locking assemblies respectively, and the thermal deformation piece is used for driving the plurality of locking assemblies to trip through the traction rod when thermal deformation occurs. The utility model provides a thermal tripping device can reduce the applied cost of circuit breaker, practice thrift the inner space of circuit breaker to can guarantee the stable work of circuit breaker.

Description

Thermal tripping mechanism and circuit breaker

Technical Field

The utility model relates to a circuit breaker technical field particularly, relates to a thermal tripping device and circuit breaker.

Background

In a thermal tripping mechanism configured for the circuit breaker, each locking assembly corresponds to one thermal deformation piece and one conducting plate to form an independent circuit, and the thermal deformation piece drives the locking assembly to trip when generating thermal deformation.

At present, a plurality of lock catch assemblies need to be configured in parallel for some circuit breakers on the market, a plurality of thermal deformation pieces and a plurality of conductive plates are configured corresponding to a plurality of lock catch assemblies to form a plurality of independent circuits for the circuit breakers, the application cost of the circuit breakers is too high, and the internal space occupies too much. In addition, in the actual working process, because the contact resistances of the plurality of lock catch assemblies are different, the current in each circuit is unbalanced, and the plurality of lock catch assemblies have an early jump phenomenon, so that the stable work of the circuit breaker is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a thermal tripping device, its applied cost and the inner space that can practice thrift the circuit breaker to can guarantee the stable work of circuit breaker.

Another object of the present invention is to provide a circuit breaker, which can save the application cost and the inner space, and can work stably.

The utility model provides a technical scheme:

the utility model provides a thermal tripping mechanism, including thermal deformation piece, traction lever, current conducting plate subassembly and a plurality of respectively with the hasp subassembly that current conducting plate subassembly electricity is connected, it is a plurality of the transmission in proper order of hasp subassembly is connected, thermal deformation piece set up in on the current conducting plate subassembly and respectively with current conducting plate subassembly and a plurality of hasp subassembly electricity is connected, the traction lever respectively with thermal deformation piece and a plurality of arbitrary one in the hasp subassembly is connected, thermal deformation piece is used for when producing thermal deformation, passes through the traction lever drives a plurality ofly hasp subassembly is tripped.

Furthermore, the traction rod includes first branch section and second branch section, the one end of first branch section is connected with a plurality of arbitrary one in the hasp subassembly, the other end of first branch section with the one end of second branch section is connected, the other end of second branch section towards with first branch section is the direction extension of contained angle, thermal deformation spare with second branch section butt.

Furthermore, the locking assembly comprises a moving contact and a locking element, the moving contact is arranged on the locking element, the traction rod is respectively connected with the thermal deformation element and any one of the locking elements, and the moving contacts of the locking elements are respectively electrically connected with the current conducting plate assembly through conducting wires.

Furthermore, the thermal tripping mechanism further comprises a plurality of connecting shafts, and the locking pieces of the two adjacent locking assemblies are connected through the connecting shafts.

Furthermore, a first connecting hole and a second connecting hole are respectively formed in the positions, located at eccentric positions, on two opposite sides of the lock catch piece, the first connecting hole formed in the lock catch piece of one of the two adjacent lock catch assemblies is in clearance fit with one end of the connecting shaft, and the second connecting hole formed in the lock catch piece of the remaining one of the lock catch assemblies is in interference fit with the other end of the connecting shaft.

Further, the first connection hole and the second connection hole are coaxially arranged.

Further, conducting plate subassembly includes first conducting plate and second conducting plate, and is a plurality of the hasp subassembly includes first hasp subassembly and the second hasp subassembly that mutual transmission connects, first hasp subassembly with first conducting plate electricity is connected, second hasp subassembly with second conducting plate electricity is connected, thermal deformation spare with first conducting plate electricity is connected, just thermal deformation spare with first hasp subassembly reaches second hasp subassembly electricity is connected, the traction lever respectively with thermal deformation spare reaches first hasp subassembly is connected.

Furthermore, a support plate is arranged on the first conductive plate, the support plate is connected with the first conductive plate through an adjusting screw, one end of the thermal deformation piece is arranged on the support plate and is electrically connected with the first conductive plate through a lead, and the other end of the thermal deformation piece is connected with the first locking assembly through the traction rod.

Further, the thermal deformation member is a bimetal.

The utility model also provides a circuit breaker, including thermal tripping device, thermal tripping device include thermal deformation spare, traction lever, current conducting plate subassembly and a plurality of respectively with the hasp subassembly that current conducting plate subassembly electricity is connected, it is a plurality of the transmission of hasp subassembly is in proper order is connected, thermal deformation spare respectively with current conducting plate subassembly and a plurality of hasp subassembly electricity is connected, the traction lever respectively with thermal deformation spare and a plurality of arbitrary one in the hasp subassembly is connected, thermal deformation spare is used for when producing thermal deformation, through the traction lever drives a plurality ofly hasp subassembly is tripped.

Compared with the prior art, the utility model provides a thermal tripping mechanism, a plurality of hasp subassemblies are connected with the current conducting plate subassembly electricity respectively, and thermal deformation spare is connected with current conducting plate subassembly and a plurality of hasp subassemblies electricity respectively, a plurality of hasp subassemblies realize electric connection each other through thermal deformation spare promptly, in practical application, the electric current that flows through in the thermal deformation spare is directly proportional with the total current that flows through each hasp subassembly, whether the contact resistance of each hasp subassembly is the same or not, can both have stable electric current to pass through in the thermal deformation spare, do not have the unbalanced problem of electric current, and then a plurality of hasp subassemblies can not take place early jump under the effect of this thermal deformation spare. The thermal tripping mechanism avoids the problem that a plurality of thermal deformation pieces are additionally arranged to form a plurality of independent circuits in the prior art, reduces the application cost of the circuit breaker and the internal occupied space of the circuit breaker on the one hand, and also prevents the problem of early tripping of the circuit breaker on the other hand, thereby ensuring the stable operation of the circuit breaker. Therefore, the utility model provides a thermal tripping device's beneficial effect includes: the application cost of the circuit breaker can be reduced, the internal space of the circuit breaker is saved, and the stable work of the circuit breaker can be ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only certain embodiments of the invention and are therefore not to be considered limiting of its scope. For a person skilled in the art, it is possible to derive other relevant figures from these figures without inventive effort.

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

fig. 2 is a circuit diagram of a thermal trip mechanism of a circuit breaker configuration provided by an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a thermal trip mechanism configured for a circuit breaker according to an embodiment of the present invention at a first view angle.

Icon: 100-thermal trip mechanism; 110-a thermally deformable member; 120-a first patch panel; 130-a drawbar; 131-a first branch section; 133-a second branch section; 140-a second patch panel; 150-a conductive plate assembly; 150 a-a first conductive plate; 150 b-a second conductive plate; 160-a support plate; 170-a latch assembly; 170 a-a first locking assembly; 170 b-a second latch assembly; 171-moving contact; 173-a catch member; 1731-a first connection hole; 1733-second connecting hole; 180-adjusting screws; 190-connecting shaft.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are merely for convenience of description of the present invention and simplifying the description, but do not indicate or imply that the device or element that is referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed" and "connected" are to be interpreted broadly, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The following describes in detail embodiments of the present invention with reference to the accompanying drawings.

Examples

The present embodiment provides a circuit breaker, which is configured with a thermal trip mechanism 100 as shown in fig. 1, the thermal trip mechanism 100 utilizes the principle that a thermal deformation member 110 is deformed by heat, when the current is too large and the duration is long, the thermal deformation member 110 is deformed to a certain extent, and the thermal trip mechanism 100 trips, i.e. the circuit breaker trips, to complete overload protection.

The thermal trip mechanism 100 includes a thermal deformation member 110, a traction rod 130, a conductive plate assembly 150 and a plurality of latch assemblies 170, wherein the plurality of latch assemblies 170 are sequentially connected in a transmission manner, the plurality of latch assemblies 170 are respectively electrically connected with the conductive plate assembly 150 through a conducting wire, and the thermal deformation member 110 is electrically connected with the conductive plate assembly 150 through a conducting wire and is respectively electrically connected with the plurality of latch assemblies 170 through a conducting wire. The draw bar 130 is connected with the thermal deformation member 110 and any one of the plurality of locking assemblies 170, when the thermal deformation member 110 is thermally deformed, the draw bar 130 can drive the locking assembly 170 connected with the draw bar 130 to perform a releasing motion, and then the locking assembly 170 drives the other locking assemblies 170 to perform a releasing motion.

Referring to fig. 2, in practical applications, the plurality of locking elements 170 are electrically connected to each other through the thermal deformation element 110, and the current flowing through the thermal deformation element 110 is proportional to the total current flowing through each locking element 170, so that no matter whether the contact resistance of each locking element 170 is the same or not, stable current can flow through the thermal deformation element 110, and the current imbalance problem does not exist, and further, the plurality of locking elements 170 do not jump early under the action of the thermal deformation element 110.

Therefore, the thermal trip mechanism 100 reduces the application cost of the circuit breaker and the internal space occupied by the circuit breaker, prevents the problem of early tripping of the circuit breaker, and ensures the stable operation of the circuit breaker.

In this embodiment, the latch assembly 170 includes a movable contact 171 and a latch member 173, the movable contact 171 is disposed on the latch member 173, the tripping means that the connection between the latch member 173 and other members on the latch assembly 170 is released, the balance of the force for maintaining the contact between the movable contact 171 and the fixed contact disposed in the circuit breaker is broken, and the movable contact 171 is separated from the fixed contact under the action of the spring, so as to cut off the circuit. The movable contacts 171 of the plurality of latching assemblies 170 are electrically connected with the conductive plate assembly 150 and the thermal deformation member 110 through conductive wires, respectively, the latching members 173 of the plurality of latching assemblies 170 are sequentially in transmission connection, and the latching member 173 of any one of the plurality of latching assemblies 170 is connected with the thermal deformation member 110 through the traction rod 130.

As shown in fig. 1 and fig. 3, the drawbar 130 includes a first branch section 131 and a second branch section 133, one end of the first branch section 131 is connected to the locking element 173 of any one of the locking elements 170, the other end of the first branch section 131 is connected to one end of the second branch section 133, the other end of the second branch section 133 extends in a direction forming an included angle with the first branch section 131, and the thermal deformation element 110 is abutted to the second branch section 133. In practical applications, when the thermal deformation element 110 deforms, the second branch segment 133 is pushed to move, and the second branch segment 133 drives the corresponding locking element 173 to move through the first branch segment 131, so that the movable contact 171 is separated from the stationary contact.

In this embodiment, a hook is disposed at an end of the first branch section 131 away from the second branch section 133, a groove is disposed on the latching member 173, and the hook extends into the groove of the latching member 173 to connect the drawbar 130 and the latching member 173. In other embodiments, the pull rod 130 may have other configurations to transfer the force of the thermal deformation element 110.

In addition, the thermal trip mechanism 100 further includes a plurality of connecting shafts 190, and the latching members 173 of two adjacent latching assemblies 170 are connected by the connecting shafts 190. In this embodiment, the two opposite sides of the locking element 173 are respectively provided with a first connection hole 1731 and a second connection hole 1733, the first connection hole 1731 and the second connection hole 1733 are disposed at eccentric positions on two sides of the locking element 173, and the first connection hole 1731 and the second connection hole 1733 are disposed coaxially. One end of the connecting shaft 190 is inserted into the first connecting hole 1731 formed in the locking element 173 of one of the two adjacent locking assemblies 170 and is in clearance fit with the first connecting hole 1731, and the other end of the connecting shaft 190 is inserted into the second connecting hole 1733 formed in the locking element 173 of the remaining locking assembly 170 and is in interference fit with the second connecting hole 1733.

In practical applications, the center position of each of the latching members 173 of the latching assemblies 170 is rotatably connected to the housing of the circuit breaker, the thermal deformation member 110 is connected to the latching member 173 of any one of the latching assemblies 170 through the pull rod 130, and when the thermal deformation member 110 is deformed, the corresponding latching member 173 is pulled by the pull rod 130 to rotate relative to the housing of the circuit breaker. When the locking member 173 starts to rotate, since the connecting shaft 190 is in clearance fit with the first connecting hole 1731, the inner hole wall of the first connecting hole 1731 gradually approaches the connecting shaft 190, before the inner hole wall of the first connecting hole 1731 contacts the connecting shaft 190, the connecting shaft 190 does not move, and the movable contact 171 corresponding to the locking member 173 has already been separated from the stationary contact.

When the inner hole wall of the first connection hole 1731 contacts the connection shaft 190, the inner hole wall of the first connection hole 1731 pushes the connection shaft 190 to move along with the rotation of the locking element 173, so as to drive the locking element 173 of the adjacent locking assembly 170 to rotate, and further to separate the movable contact 171 of the adjacent locking assembly 170 from the corresponding fixed contact. That is, in the present embodiment, when the thermal deformation element 110 drives the corresponding connected locking assembly 170 to trip, the tripping actions of the other locking assemblies 170 have a certain time delay.

In the thermal trip mechanism 100 of the present embodiment, the conductive plate assembly 150 includes the first conductive plate 150a and the second conductive plate 150b, and in other embodiments, the conductive plate assembly 150 may also be an integral conductive plate. The plurality of locking elements 170 includes a first locking element 170a and a second locking element 170 b. The locking member 173 of the first locking assembly 170a is connected to the locking member 173 of the second locking assembly 170b by a connecting shaft 190, the movable contact 171 of the first locking assembly 170a is electrically connected to the first conductive plate 150a by a conductive wire, and the movable contact 171 of the second locking assembly 170b is electrically connected to the second conductive plate 150b by a conductive wire. The thermal deformation element 110 is fixed on the first conductive plate 150a and electrically connected to the first conductive plate 150a through a conductive wire, and the thermal deformation element 110 is further electrically connected to the movable contact 171 of the first latch assembly 170a and the movable contact 171 of the second latch assembly 170b through conductive wires, respectively. The first leg 131 of the pulling rod 130 is connected to the latching member 173 of the first latching assembly 170a, and the second leg 133 of the pulling rod 130 abuts against the thermal deformation member 110.

In practical applications, the first patch board 120 and the second patch board 140 are connected to the same line row, that is, the same circuit current is introduced into the first conductive plate 150a and the second conductive plate 150 b.

The first conductive plate 150a is provided with a support plate 160, the support plate 160 is connected with the first conductive plate 150a through an adjusting screw 180, the thermal deformation member 110 is clamped between the support plate 160 and the first conductive plate 150a, and the thermal deformation member 110 is fixedly connected with the support plate 160 and connected with the first conductive plate 150a through a flexible connecting wire.

It should be noted that a through hole corresponding to the position of the adjusting screw 180 is formed in the housing of the circuit breaker, and in practical application, the adjusting screw 180 can be adjusted by inserting the screw driver through the through hole, so as to adjust the thermal deformation member 110.

In this embodiment, the thermal deformation element 110 is a rectangular strip-shaped bimetal, one end of the bimetal is fixedly connected to the supporting plate 160 and electrically connected to the first conductive plate 150a through a wire, and the other end of the bimetal is electrically connected to the moving contact 171 of the first latch assembly 170a and the moving contact 171 of the second latch assembly 170b through wires and abutted to the second branch 133 of the drawbar 130.

In the actual working process, because the deformation degree of the active layer of the bimetal is greater than that of the passive layer under the temperature change, the whole bimetal bends towards the direction of the second branch section 133 pressing the traction rod 130, the second branch section 133 is pushed to drive the first branch section 131 and the first locking component 170a to move towards the direction away from the fixed contact, so that after the movable contact 171 of the first locking component 170a is separated from the corresponding fixed contact, the connecting shaft 190 drives the locking component 173 of the second locking component 170b to rotate, the movable contact 171 of the second locking component 170b is separated from the corresponding fixed contact, and the tripping of the first locking component 170a and the second locking component 170b is completed.

In the thermal trip mechanism 100 of the circuit breaker provided by this embodiment, in the actual working process, the circuit formed by the first latch assembly 170a and the first conductive plate 150a is connected in parallel with the circuit formed by the second latch assembly 170b and the second conductive plate 150b through the bimetallic strip, and no matter whether the contact resistances of the first conductive plate 150a and the second conductive plate 150b are the same, stable current can pass through the bimetallic strip, that is, the phenomenon of early trip due to current imbalance is not generated, and the stable working of the circuit breaker is ensured. In addition, the thermal trip mechanism 100 is formed by connecting two trip circuits in parallel through the bimetallic strip, so that the problem that a plurality of thermal deformation pieces 110 are additionally arranged to form a plurality of independent circuits is avoided, and the application cost of the circuit breaker and the internal occupied space of the circuit breaker are reduced.

Therefore, the utility model provides a thermal trip mechanism 100 can reduce the applied cost of circuit breaker, practice thrift the inner space of circuit breaker to can guarantee the stable work of circuit breaker.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a thermal tripping mechanism, its characterized in that, including thermal deformation piece, traction lever, current conducting plate subassembly and a plurality of respectively with the hasp subassembly that current conducting plate subassembly electricity is connected, it is a plurality of the transmission is connected in proper order to the hasp subassembly, the thermal deformation piece set up in on the current conducting plate subassembly and respectively with current conducting plate subassembly and a plurality of hasp subassembly electricity is connected, the traction lever respectively with thermal deformation piece and a plurality of arbitrary one in the hasp subassembly is connected, the thermal deformation piece is used for when producing thermal deformation, through the traction lever drives a plurality ofly hasp subassembly is tripped.

2. The thermal trip mechanism according to claim 1, wherein the drawbar comprises a first leg section and a second leg section, one end of the first leg section is connected to any one of the plurality of latch assemblies, the other end of the first leg section is connected to one end of the second leg section, the other end of the second leg section extends in a direction forming an included angle with the first leg section, and the thermally deformable member abuts against the second leg section.

3. The thermal trip mechanism according to claim 1, wherein the latching assembly comprises a movable contact and a latching member, the movable contact is disposed on the latching member, the drawbar is respectively connected to the thermally deformable member and the latching member of any one of the plurality of latching assemblies, and the movable contacts of the plurality of latching assemblies are respectively electrically connected to the conductive plate assembly through wires.

4. The thermal trip mechanism of claim 3, further comprising a plurality of connecting shafts through which the respective latching members of adjacent two of said latching assemblies are connected.

5. The thermal trip mechanism according to claim 4, wherein a first connection hole and a second connection hole are respectively formed at eccentric positions on opposite sides of the locking member, the first connection hole formed in the locking member of one of the adjacent two locking assemblies is in clearance fit with one end of the connection shaft, and the second connection hole formed in the locking member of the remaining one of the locking assemblies is in interference fit with the other end of the connection shaft.

6. The thermal trip mechanism of claim 5, wherein said first connection hole is coaxially disposed with said second connection hole.

7. The thermal trip mechanism according to claim 1, wherein said conductive plate assembly comprises a first conductive plate and a second conductive plate, and said plurality of locking assemblies comprises a first locking assembly and a second locking assembly in driving connection with each other, said first locking assembly being electrically connected to said first conductive plate, said second locking assembly being electrically connected to said second conductive plate, said thermal deformation member being electrically connected to said first locking assembly and said second locking assembly, and said drawbar being respectively connected to said thermal deformation member and said first locking assembly.

8. The thermal trip mechanism according to claim 7, wherein a support plate is provided on the first conductive plate, the support plate is connected to the first conductive plate by an adjustment screw, one end of the thermal deformation member is provided on the support plate and electrically connected to the first conductive plate by a wire, and the other end of the thermal deformation member is connected to the first latch assembly by the drawbar.

9. The thermal trip mechanism of claim 1, wherein said thermally deformable member is a bimetallic strip.

10. A circuit breaker comprising a thermal trip mechanism according to any of claims 1 to 9.

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