CN107039218B - A kind of protective switch and circuit protection device - Google Patents

Abstract

The invention discloses a kind of protective switch and circuit protection devices, belong to electric switch field.The protective switch includes shell, and the first connecting terminal of setting in the housing, second connecting terminal, first bimetal leaf, tripping mechanism, moving contact, static contact and fuse, first connecting terminal is electrically connected with the first bimetal leaf, first bimetal leaf is electrically connected with static contact, moving contact is arranged on tripping mechanism, the side of tripping mechanism is arranged in first bimetal leaf, second connecting terminal is electrically connected with moving contact by fuse, first bimetal leaf bends towards tripping mechanism when circuit overloads cause temperature to increase, tripping mechanism is set to thread off, to which moving contact be separated with static contact, so that the connection between the first connecting terminal and the second connecting terminal disconnects, to play the role of overload protection, fuse fuses in short circuit, so that the connection between the first connecting terminal and the second connecting terminal disconnects, to play short-circuit guarantor The effect of shield.

Description

A kind of protective switch and circuit protection device

Technical field

The present invention relates to electric switch field, in particular to a kind of protective switch and circuit protection device.

Background technique

Protective switch is a kind of safety device connected in circuit, primarily to disconnecting electricity in overload or short circuit Road avoids circuit from damaging.

Currently used protective switch generally comprises bimetal leaf, tripping mechanism, electromagnet, moving contact and static contact, takes off Buckle mechanism is for controlling contact or separation of the moving contact with static contact, in circuit overloads, can deform since bimetal leaf is heated, Tripping mechanism is triggered during bi-metal plate deformed, so that moving contact and static contact separation, achieve the purpose that disconnecting circuit, When short circuit occurs in circuit, electromagnet adsorbs iron core movement makes tripping mechanism thread off so that iron core hits tripping mechanism, thus So that moving contact and static contact separation, disconnect circuit rapidly.

Due to needing that electromagnet is arranged, the volume of protective switch can be made larger, while in order to avoid generating electric arc, Also need to be arranged in protective switch arc-control device, moving contact and static contact are also required to the knot destroyed using that can bear larger electric arc Structure, this just further increases the volume of protective switch, increases production cost.

Summary of the invention

It is big in order to solve existing protective switch volume, it is at high cost, and will appear electric arc when through electromagnet break contact The problem of, the embodiment of the invention provides a kind of protective switch and circuit protection devices.The technical solution is as follows:

On the one hand, the embodiment of the invention provides a kind of protective switch, the protective switch includes shell, and setting exists The first connecting terminal, the second connecting terminal, the first bimetal leaf, tripping mechanism, moving contact, static contact in the shell and molten Silk, first connecting terminal are electrically connected with first bimetal leaf, and first bimetal leaf is electrically connected with the static contact It connects, the moving contact is arranged on the tripping mechanism, and the side of the tripping mechanism, institute is arranged in first bimetal leaf It states the second connecting terminal and is electrically connected with the moving contact by the fuse, when the moving contact and the static contact contact, institute It states the first connecting terminal and second connecting terminal and passes through the static contact, the moving contact and fuse electrical connection, institute It states the first bimetal leaf and bends towards the tripping mechanism when circuit overloads cause temperature to increase, the tripping mechanism is made to thread off, from And separate the moving contact with the static contact, so that the company between first connecting terminal and second connecting terminal Connect disconnection, the fuse fuses in the short circuit so that first connecting terminal and second connecting terminal it Between connection disconnect.

By the way that the first bimetal leaf is arranged between the first connecting terminal and static contact, so that when circuit overloads, first Bimetal leaf generates deformation because temperature increases, so that tripping mechanism is triggered, so that moving contact and static contact separation, to play The effect of overload protection, by the way that fuse is arranged between the second connecting terminal and moving contact, so that when occurring short circuit in circuit, Fuse failure disconnects circuit, thus play the role of short-circuit protection, simultaneously because circuit is disconnected by the fuse that fuses, and No setting is required electromagnet, therefore setting arc-control device is not needed, to reduce the volume of protective switch, and reduces and be produced into This, usual fuse can be used as overload protection may be used as short-circuit protection again, when designing fuse it needs to be determined that fuse melts Disconnected characteristic, size of current, fusing time length etc. when including fusing, when fuse is used as overload protection, for operating chacteristics Precise requirements it is higher, the cost is relatively high, and when fuse be used as short-circuit protection when, for the precise requirements of operating chacteristics Then lower, cost is relatively low, and fuse only provides short-circuit protection in the application, therefore can reduce certain cost.

Optionally, fuse can fusing when reaching 4~12 times of rated current of electric current in circuit.

Preferably, the fusing when electric current of fuse in circuit reaches 5~8 times of rated current, specifically can be according to reality Circuit needs to select suitable fuse, it is ensured that fuse fuses when short circuit occurs in circuit.

Preferably, it is electrically connected between the fuse and second connecting terminal by the second bimetal leaf, described second The other side of the tripping mechanism is arranged in bimetal leaf, and second bimetal leaf bends towards the tripping mechanism when heated, So that tripping mechanism is threaded off, moving contact is separated with static contact, allows protective switch in the first bimetal leaf and the Any one in two bimetal leafs occurs disconnecting circuit when temperature raising.

Further, first connecting terminal is U-shaped elastic sheet metal or screw connecting terminal, second terminals Son is that U-shaped elastic sheet metal or screw connecting terminal can select metallic copper or aluminium as U-shaped bullet in general circuit The making material of property sheet metal.

Further, the U-shaped elastic sheet metal includes the two side arms of bottom with the both ends for being connected to the bottom, institute It states and is correspondingly arranged on bulge-structure on the opposite two sides of two side arms, it can be by the conducting wire in circuit by two bulge-structures It is stuck in U-shaped elastic sheet metal, while can also adjust the spacing between two bulge-structures by being bent two side arms, make electricity Conducting wire in road can be preferably stuck in U-shaped elastic sheet metal.

Circuit is caused to disconnect in order to avoid the conducting wire in circuit is deviate from from the first connecting terminal, it can in circuit A binding post is connected on conducting wire, and binding post is inserted into the first connecting terminal and is attached, while binding post can be set It is thick intermediate thin or thin the thick one end in one end structure in both ends, the thicker one end of binding post is inserted into the first connecting terminal, A possibility that being cooperated by bulge-structure and binding post, improve the reliability of connection, reducing binding post abjection.

Optionally, the tripping mechanism includes first connecting rod, second connecting rod, third connecting rod, fourth link and release lever, institute The middle part for stating first connecting rod is rotatablely connected on the housing, and one end of the first connecting rod is arranged in the moving contact, described The other end of first connecting rod and one end of the second connecting rod are hinged, the other end of the second connecting rod and the third connecting rod One end is hinged, and the other end face of the second connecting rod is equipped with the first sealed face, one end of the third connecting rod and described the One end of double leval jib is hinged, and the other end rotation connection of the fourth link on the housing, is arranged in the fourth link Flexible energy-storage travelling wave tube, the elastic energy storage element are used to provide the first torque, the first connecting rod, institute for the fourth link The rotational plane for stating second connecting rod, the third connecting rod and the fourth link is parallel to each other, the release lever and described first Connecting rod is arranged with shaft, and one end of the release lever is equipped with the second sealed face compatible with the described first sealed face, described de- Setting has elastic component on button bar, and the elastic element is used to provide the second torque for the release lever, first torque with Second torque it is contrary.

Preferably, the position for the first connecting rod being corresponded on the shell is additionally provided with limited block, when the moving contact with When the static contact contacts, the limited block and first connecting rod phase from, when the moving contact is separated with the static contact, The first connecting rod is resisted against on the limited block.

Optionally, the protective switch further includes resetting-mechanism, and the resetting-mechanism is multiple for controlling the tripping mechanism Position, makes the moving contact resume contacts with the static contact, in addition, the decrement of elastic element should be controlled, to avoid first Behind sealed face and the second sealed face separation, the angle of release lever rotation is excessive, and makes when resetting to tripping mechanism, difficult Second connecting rod to be pressed between first connecting rod and release lever again.

In order to improve the protecting effect of protective switch, the protective switch further includes fuse alarm, the fusing alarm Device is in parallel with the fuse, and the fuse alarm in the fuse failure for sounding an alarm, to inform work people in time Member's circuit generates failure, and staff is reminded to place under repair in time to circuit.

Optionally, the fuse alarm includes light emitting diode, in addition, fuse alarm can also be using other reports Police's formula, for example, using buzzer or the combination of buzzer and light emitting diode etc., type of alarm is usually with can be at this It is that principle selects that staff's timely learning is allowed in working environment.

Preferably, a cunning storehouse that can be taken off is provided in the shell, the fuse is arranged in the sliding storehouse, the cunning Be provided with the first contact and the second contact on the lateral wall in storehouse, the both ends of the fuse respectively with first contact and described Two contacts are electrically connected, and third contact and the 4th contact, the third contact and second terminals are provided on the shell Son electrical connection, the 4th contact is electrically connected with the moving contact, when the sliding storehouse is placed in the shell, described first Contact is electrically connected with the third contact, and second contact is electrically connected with the 4th contact, allows to taking out sliding storehouse Afterwards, the replacement of fuse is carried out.

Further, it is additionally provided with post rod mechanism in the protective switch, for during the sliding storehouse is removed, The tripping mechanism is set to thread off, so that the moving contact be separated with the static contact.

Specifically, the post rod mechanism includes the jacking block being arranged on the lateral wall in the sliding storehouse and is arranged in the sliding storehouse Outer mandril, towards the sliding storehouse, the other end is provided with tiltedly towards the release lever on the jacking block for one end of the mandril Face, during sliding storehouse is removed, length direction of the jacking block by slope driving mandril along mandril is moved, so that mandril pushes Release lever rotation, so that tripping mechanism be made to thread off.

On the other hand, the embodiment of the invention also provides a kind of circuit protection device, the circuit protection device includes extremely Lack two aforementioned any protective switchs, the main line of circuit is arranged in a protective switch at least two protective switch On, other protective switchs at least two protective switch are separately positioned on the branch road connecting with the main line, setting It is greater than the fuse for the protective switch being arranged on the branch road in the rated current of the fuse of the protective switch on the main line Rated current.

In practical applications, due to the difference of circuit structure, the quantity for the protective switch that circuit protection device includes can also Can be different, a protective switch can be respectively provided in each branch, it, can also only wherein to provide the safety of circuit Protective switch is set in the branch relatively easily to break down, to reduce cost.

Detailed description of the invention

To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other Attached drawing.

Fig. 1 is a kind of structural schematic diagram of protective switch provided in an embodiment of the present invention；

Fig. 2 is a kind of connection schematic diagram of remote alarming device provided in an embodiment of the present invention；

Fig. 3 is a kind of structure chart of screw connecting terminal provided in an embodiment of the present invention；

Fig. 4 is the status diagram of the screw connecting terminal after fixing screws provided in an embodiment of the present invention are screwed into；

Fig. 5 is a kind of structure chart of tripping mechanism provided in an embodiment of the present invention；

Fig. 6 is a kind of structure chart of third connecting rod provided in an embodiment of the present invention；

Fig. 7 is the schematic diagram of another state of tripping mechanism provided in an embodiment of the present invention；

Fig. 8 is the structural schematic diagram of another protective switch provided in an embodiment of the present invention；

Fig. 9 is the rear view of protective switch shown in fig. 8；

Figure 10 is a kind of structure chart of circuit protection device provided in an embodiment of the present invention.

Specific embodiment

To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention Formula is described in further detail.

Fig. 1 is a kind of structural schematic diagram of protective switch provided in an embodiment of the present invention, as shown in Figure 1, the protective switch Including shell 10, and setting the first connecting terminal 21 in the housing 10, the second connecting terminal 22, the first bimetal leaf 26, Tripping mechanism 25, moving contact 23, static contact 24 and fuse 27, the first connecting terminal 21 are electrically connected with the first bimetal leaf 26, the One bimetal leaf 26 is electrically connected with static contact 24, and moving contact 23 is arranged on tripping mechanism 25, and the setting of the first bimetal leaf 26 exists The side of tripping mechanism, the second connecting terminal 22 are electrically connected with moving contact 23 by fuse 27, and moving contact 23 and static contact 24 connect When touching, the first connecting terminal 21 and the second connecting terminal 22 are electrically connected by static contact 24, moving contact 23 and fuse 27, and first pair Sheet metal 26 bends towards tripping mechanism 25 when circuit overloads cause temperature to increase, and so that tripping mechanism 25 is threaded off, thus by moving contact 23 separate with static contact 24, disconnect the connection between the first connecting terminal 21 and the second connecting terminal 22, fuse 27 is in circuit It fuses when short-circuit, disconnects the connection between the first connecting terminal 21 and the second connecting terminal 22.

By the way that the first bimetal leaf is arranged between the first connecting terminal and static contact, so that when circuit overloads, first Bimetal leaf generates deformation because temperature increases, so that tripping mechanism is triggered, so that moving contact and static contact separation, to play The effect of overload protection, by the way that fuse is arranged between the second connecting terminal and moving contact, so that when occurring short circuit in circuit, Fuse failure disconnects circuit, thus play the role of short-circuit protection, simultaneously because circuit is disconnected by the fuse that fuses, and No setting is required electromagnet, therefore setting arc-control device is not needed, while reducing the volume of protective switch, and reduce and be produced into This, usual fuse can be used as overload protection may be used as short-circuit protection again, when designing fuse it needs to be determined that fuse melts Disconnected characteristic, size of current, fusing time length etc. when including fusing, when fuse is used as overload protection, for operating chacteristics Precise requirements it is higher, the cost is relatively high, and when fuse be used as short-circuit protection when, for the precise requirements of operating chacteristics Then lower, cost is relatively low, and fuse only provides short-circuit protection in the application, therefore can reduce certain cost.

Optionally, fuse can fusing when reaching 4~12 times of rated current of electric current in circuit.

Preferably, the fusing when electric current of fuse in circuit reaches 5~8 times of rated current, specifically can be according to reality Circuit needs to select suitable fuse, it is ensured that fuse fuses when short circuit occurs in circuit.

When realization, a pair of of fuse holder 31 is also provided on shell 10, the both ends of fuse 27 are fastened on corresponding fuse holder In 31, the both ends of fuse 27 are electrically connected with moving contact 23 and the second connecting terminal 22 respectively by fuse holder 31, and fuse holder 31 can To facilitate the installation and replacement of fuse 27.

It should be noted that can be connected by conducting wire 30 flexible between moving contact 23 and fuse holder 31, it is dynamic to facilitate The movement of contact 23.

As shown in Figure 1, being electrically connected between fuse 27 and the second connecting terminal 22 by the second bimetal leaf 28, second pair of gold Belong to the other side that tripping mechanism 25 is arranged in piece 28, the second bimetal leaf 28 bends towards tripping mechanism 25 when heated, passes through setting When second bimetal leaf 28 can to occur poor contact at the second connecting terminal 22 and local electrical resistance is increased, second Bimetal leaf 28 generates deformation, and tripping mechanism 25 is made to thread off, so that moving contact 23 be made to separate with static contact 24, so as to avoid the Occur constant temperature at two connecting terminals 22 and increase the case where even burning, further improves the safety of circuit.

Specifically, bimetal leaf refers to the sheet metal as made of the different metal or alloy fitting of two kinds of thermal expansion coefficients, Since two kinds of thermal expansion metal coefficients for constituting bimetal leaf are different, when the temperature of bimetal leaf changes, double gold Deformation will be generated by belonging to piece, and when realization, the material for constituting the first bimetal leaf 26 and the material for constituting the second bimetal leaf 28 can It can also be different with identical.

It, can also be it should be noted that bimetal leaf can deformation occurs when locating environment temperature changes Deformation occurs when electric current on bimetal leaf increases and the temperature of bimetal leaf is caused to increase.

Optionally, bimetal leaf can trigger tripping mechanism 25 when electric current increases to the rated current of 2 times of circuits, So that moving contact 23 and static contact 24 disconnect.

When realization, the first bimetal leaf 26 and the second bimetal leaf 28 are equal between tripping mechanism 25 when deformation occurs It is provided with gap, since gap is bigger, the first bimetal leaf 26 and the second bimetal leaf 28 just need to generate bigger deformation Tripping mechanism 25 can be triggered, and temperature is higher, the deformation of the first bimetal leaf 26 and the second bimetal leaf 28 is also bigger, because This, by adjusting the size in the gap between the first bimetal leaf 26 and tripping mechanism 25 and the second bimetal leaf 28 and can take off The size in the gap between buckle mechanism 25 respectively triggers tripping mechanism to adjust the first bimetal leaf 26 and the second bimetal leaf 28 Temperature when 25, to adapt to different needs.

Preferably, protective switch further includes fuse alarm, and fuse alarm is in parallel with fuse 27, and fuse alarm is used for It is sounded an alarm when fuse 27 fuses, when fuse 27 does not fuse, since fuse alarm is in parallel with fuse 27, fusing alarm Device is in short circuit state, and when fuse 27 fuses, fuse alarm is switched on, and is sounded an alarm, so as to molten in fuse 27 It reminds user to check circuit when disconnected in time and replaces fuse 27.

Specifically, fuse alarm may include light emitting diode 32, and light emitting diode 32 is small in size, be easily installed in shell On body 10.

When realization, light emitting diode 32 be can be set on the side wall of shell 10, respective leds 32 on shell 10 Position one mounting hole is set, the luminous component of light emitting diode 32 is plugged in mounting hole.

Further, in alternating current circuit, a light emitting diode 32 can be only set, since light emitting diode 32 has One-way conduction, thus fuse 27 fusing after, light emitting diode 32 can constantly flash, it is easier to cause user's note that Furthermore two light emitting diodes 32 can also be connected in reverse parallel in 27 both ends of fuse, in this way after the fusing of fuse 27, two shine Diode 32 can alternately flash, and the frequency of flashing and the frequency of electric current are consistent.

In DC circuit, two light emitting diodes 32 can also be connected in reverse parallel in 27 both ends of fuse, so as to protect Card has a light emitting diode 32 to keep the state of continuous illumination always in fuse failure.

Preferably, fuse alarm can also include current-limiting resistance 33, and current-limiting resistance 33 is connected with light emitting diode 32, lead to Setting current-limiting resistance 33 is crossed, the electric current in circuit can be reduced with the resistance of increasing circuit, light emitting diode 32 is avoided to burn.

Certainly, fuse alarm can also using other type of alarms, for example, using buzzer or buzzer with The combination etc. of light emitting diode.

Further, which further includes the remote cabling terminal 51 of setting on the housing 10, remote cabling terminal 51 one end is electrically connected with one end of fuse 27, and the other end of remote cabling terminal 51 is then connect with remote alarming device, is passed through Remote cabling terminal 51 connect the long-range monitoring that protective switch may be implemented with remote alarming device.

Specifically, one end of remote cabling terminal 51 can be electrically connected with a fuse holder 31 by sheet metal or metal wire It connects.

Fig. 2 is a kind of connection schematic diagram of remote alarming device provided in an embodiment of the present invention, is connected with the remote alarms The protective switch of device 52 can connect in DC circuit, should be as shown in Fig. 2, protective switch 40 is connected to the negative of DC power supply Between pole and electrical appliance 53, one end of remote cabling terminal 51 is electrically connected with fuse 27 close to one end of electrical appliance 53, this is long-range Warning device 52 include first resistor R1, second resistance R2 and voltage monitoring module 54, the other end of remote cabling terminal 51 with One end of first resistor R1 is electrically connected, and the other end of first resistor R1 is electrically connected with one end of second resistance R2, second resistance R2 The other end ground connection or connect with the cathode of DC power supply, can connect voltage monitoring between first resistor R1 and second resistance R2 Module 54, when fuse 27 does not fuse, since 27 resistance of fuse is small, the cathode of remote cabling terminal 51 and ground or DC power supply Between voltage be 0, therefore the voltage value that monitors of voltage monitoring module 54 is 0, when fuse 27 fuses, remote cabling terminal Voltage between 51 and ground or the cathode of DC power supply can increase suddenly, so that the voltage value that voltage monitoring module 54 monitors is big In 0.Therefore it can judge whether fuse 27 fuses by the variation of 54 monitoring voltage value of voltage monitoring module.

Preferably, the first connecting terminal 21 is U-shaped elastic sheet metal or screw connecting terminal, and the second connecting terminal 22 is U Shape elastic sheet metal or screw connecting terminal can be convenient and access protective switch in circuit.

Specifically, as shown in Figure 1, the first connecting terminal 21 can be U-shaped elastic sheet metal, U-shaped elastic sheet metal and the One bimetal leaf 26 electrical connection, when protective switch is linked into circuit, can directly by circuit conducting wire or wiring Column is inserted into U-shaped elastic sheet metal, convenient for connection.

Specifically, U-shaped elastic sheet metal include bottom and be connected to bottom both ends two side arms, two side arms it is opposite Bulge-structure 211 is correspondingly arranged on two sides, conducting wire or binding post can be stuck in U-shaped elastic metallic by bulge-structure 211 In piece, so as to avoid conducting wire or binding post from deviating from from the first connecting terminal 21.

When realization, the mounting groove for installing the first connecting terminal 21 can be set on shell 10, on the side wall of shell 10 Then be provided with for in circuit conducting wire or binding post be inserted into opening in the first connecting terminal 21.

In the present embodiment, the second connecting terminal 22 is screw connecting terminal, and Fig. 3 is one kind provided in an embodiment of the present invention The structure chart of screw connecting terminal, in conjunction with Fig. 1 and Fig. 3, the second connecting terminal 22 may include junction block 221 and fixing screws 222, screw hole compatible with fixing screws 222 is provided on junction block 221, and junction block 221 may include pedestal 221a, fixation In the conducting block 221b on pedestal 221a and the pressing plate 221c being rotatably arranged on pedestal 221a, conducting block 221b and The electrical connection of two bimetal leafs 28, pressing plate 221c are oppositely arranged with conducting block 221b, and pressing plate 221c is in first position and the second position Between rotate, spacing of the pressing plate 221c at first position between conducting block 221b is greater than at the second position and conducting block Spacing between 221b, when fixing screws 222 back-out junction block 221, pressing plate 221c turns to first position, works as fixing screws 222 when being screwed into junction block 221, and pressing plate 221c turns to the second position, is shown second after fixing screws 222 are back-outed in Fig. 3 The state of connecting terminal 22, pressing plate 221c is rotated to 222 side of fixing screws at this time, increases pressing plate 221c and conducting block 221b Between spacing, allow insertion conducting wire take out, Fig. 4 is that the screw after fixing screws provided in an embodiment of the present invention are screwed into connects The status diagram of line terminals, as shown in figure 4, fixing screws 222 can lead to when fixing screws 222 are tightened into junction block 221 It crosses side wall and pushes pressing plate 221c, so that the hypotelorism between pressing plate 221c and conducting block 221b, leads so as to what will be inserted into Line is pressed on conducting block 221b.

It should be noted that, although used in the embodiment of the present invention is the screw connecting terminal in Fig. 3, but in other realities The screw connecting terminal that other structures can also be used in example is applied, the present invention is not limited thereto.

It should be noted that, although the structure of the first connecting terminal 21 and the second connecting terminal 22 in the embodiment of the present invention Difference, but in other embodiments, the structure of the first connecting terminal 21 and the second connecting terminal 22 can be identical, and first connects Line terminals 21 and the second connecting terminal 22 can be all made of the structure or the second wiring of the first connecting terminal 21 in the present embodiment The structure of terminal 22, the present invention is not limited thereto.

In addition, aforementioned remote cabling terminal 51 can also use U-shaped elastic sheet metal or screw connecting terminal, it is preferred to use U-shaped elastic sheet metal, in order to the connection of conducting wire.

Fig. 5 is a kind of structure chart of tripping mechanism provided in an embodiment of the present invention, as shown in figure 5, the tripping mechanism includes First connecting rod 251, second connecting rod 252, third connecting rod 253, fourth link 254 and release lever 255, the middle part of first connecting rod 251 On the housing 10, one end of first connecting rod 251, the other end of first connecting rod 251 and second is arranged in moving contact 23 for rotation connection One end of connecting rod 252 is hinged, and one end of the other end and third connecting rod 253 of second connecting rod 252 is hinged, second connecting rod 252 it is another One end end face is equipped with the first sealed face 2521, and the other end of third connecting rod 253 and one end of fourth link 254 are hinged, and the 4th The other end rotation connection of connecting rod 254 on the housing 10, is provided with elastic energy storage element 256, elastic energy storage in fourth link 254 Element 256 is used to provide the first torque for fourth link 254, first connecting rod 251, second connecting rod 252, third connecting rod 253 and the The rotational plane of double leval jib 254 is parallel to each other, and release lever 255 and first connecting rod 251 are arranged with shaft, one end of release lever 255 Equipped with second sealed face 2551 compatible with the first sealed face 2521, setting has elastic component 257 on release lever 255, elasticity Element 257 is used to provide the second torque for release lever 255, the first torque and the second torque it is contrary.

When realization, shell 10 may include the bottom plate for installing tripping mechanism 25, first connecting rod 251 and release lever 255 It can be rotatably connected on bottom plate by the first straight pin 25a being vertically fixed on bottom plate, first connecting rod 251 and second connecting rod 252 can be by the second straight pin 25b connection, and fourth link 254 can be by the third straight pin that is vertically fixed on bottom plate 25c is rotatably connected on bottom plate, and Fig. 6 is a kind of structure chart of third connecting rod provided in an embodiment of the present invention, as shown in fig. 6, the Three-link 253 may include always bar portion 2531 and with two interconnecting piece 2532 connected vertically of straight-bar portion 2531, two interconnecting pieces The setting of 2532 parallel intervals, two interconnecting pieces 2532 are plugged in compatible circular hole in second connecting rod 252 and fourth link 254 respectively In, and the first straight pin 25a, the second straight pin 25b, interconnecting piece 2532, third straight pin 25c are mutually parallel.

Specifically, the first pushing part for pushing release lever 255 to rotate to same direction can be set on release lever 255 255a and the second pushing part 255b, the first bimetal leaf 26 and the second bimetal leaf 28 can be separately positioned on release lever 255 Two sides, the first pushing part 255a push release lever 255 to rotate under the action of the first 26 deformation of bimetal leaf, the second pushing part 255b pushes release lever 255 to rotate to identical direction under the action of the second 28 deformation of bimetal leaf.

The tripping mechanism 25 that Fig. 5 is shown is in the state for contacting moving contact 23 and static contact 24, and Fig. 7 is implementation of the present invention The schematic diagram of another state for the tripping mechanism that example provides, the tripping mechanism 25 that Fig. 7 is shown, which is in, makes moving contact 23 and static contact 24 isolated states briefly describe the tripping process of tripping mechanism provided in an embodiment of the present invention below with reference to Fig. 5 and Fig. 7:

Referring to Fig. 5, release lever 255 is under the action of the second torque that elastic element 257 provides, to first connecting rod 251 Direction (in Fig. 5 counterclockwise) rotation, so that the second sealed face 2551 is pressed on the first sealed face 2521, to pass through the Two connecting rods 252 push first connecting rod 251 to turn to moving contact 23 and contact with static contact 24, simultaneously because elastic energy storage element at this time 256 elastic force is not enough to pull second connecting rod 252 to make the first sealed face 2521 and the second sealed face 2551 by third connecting rod 253 Separation, therefore the state that moving contact 23 and static contact 24 can be kept in contact, when the first bimetal leaf 26 or the second bimetal leaf Any one in 28 deformation occurs and when pushing release lever 255, the first bimetal leaf 26 or the second bimetal leaf 28 are to first The torque of the thrust of connecting rod 251 is contrary with the second torque, so that pressure of the second sealed face 2551 to the first sealed face 2521 Clamp force reduces, and when reducing to a certain extent, the elastic force of elastic energy storage element 256 is enough to pull second by third connecting rod 253 Connecting rod 252, so that the first sealed face 2521 is separated with the second sealed face 2551, second connecting rod 252 pulls first connecting rod 251 Rotation, separates moving contact 23 with static contact 24, tripping mechanism 25 moves to state shown in fig. 7.

It should be noted that Fig. 5 and Fig. 7 is merely to realize a kind of tripping mechanism of the present invention and use, in other realities It applies in example, the tripping mechanism of other structures can also be used, the present invention is not limited thereto.

Optionally, elastic energy storage element 256 can be torsional spring, and one end of torsional spring is fixedly connected in fourth link 254, separately One end is fixedly connected on the housing 10, is easily installed and is replaced.

Optionally, support column 25d is additionally provided on shell 10, elastic element 257 can be torsional spring, and one end of torsional spring is fixed It is connected on release lever 255, the other end is connected on support column 25d, is easily installed and is replaced.

It should be noted that elastic energy storage element 256 and elastic element 257 can also be other elastic components, such as clockwork spring Spring etc., system that the present invention is not limited thereto.

It is contemplated that when elastic energy storage element 256 and elastic element 257 are using other elastic components, different elasticity The mounting means of part may also be different, such as when elastic element 257 is clockwork spring, one end of clockwork spring can the company of fixation It connects on release lever 255, the other end of clockwork spring can be fixedly connected on the first straight pin 25a.

Preferably, the position for first connecting rod 251 being corresponded on shell 10 is additionally provided with limited block 11, when moving contact 23 and stationary contact When first 24 contact, limited block 11 is with 251 phase of first connecting rod from when moving contact 23 is separated with static contact 24, first connecting rod 251 is supported It leans against on limited block 11, so as to avoid 251 rotational angle of first connecting rod excessive.

Further, protective switch further includes resetting-mechanism 29, and resetting-mechanism 29 makes for controlling the reset of tripping mechanism 25 Moving contact 23 resumes contacts with static contact 24, so as to facilitate the reset of tripping mechanism 25, protective switch is enable to make repeatedly With.

Specifically, resetting-mechanism 29 may include reseting handle 291, can be correspondingly arranged on shell 10 multiple for installing The mounting groove of position handle 291, reseting handle 291 can be slidably arranged in mounting groove along mounting groove, one end of reseting handle 291 It can stretch out outside shell 10, be operated with facilitating.

In one implementation, the other end of reseting handle 291 can be hinged on third connecting rod with fourth link 254 One end on 253 is in contact setting, after moving contact 23 and static contact 24 separate, passes through reseting handle 291 and pushes fourth link 254 rotations to push third connecting rod 253, then push second connecting rod 252 by third connecting rod 253, so that second connecting rod 252 pushes away Dynamic first connecting rod 251 turns to moving contact 23 and contacts with static contact 24, and second connecting rod 252 is made to be stuck in 251 He of first connecting rod Between second connecting rod 252, the second sealed face 2551 is pressed on the first sealed face 2521, to realize that tripping mechanism 25 resets.

In another implementation, the other end of reseting handle 291 can be articulated and connected with fourth link 254, thus Not only tripping mechanism 25 can have been controlled by pressing reseting handle 291 to reset, but also can be by pulling reseting handle 291 manually will Moving contact 23 and static contact 24 separate, and are disconnected circuit when replacing fuse 27 with facilitating, when circuit is arranged in protective switch When in branch, moving contact 23 and static contact 24 can be separated manually by reseting handle 291, so as on the main line of circuit In the case where all continuing normal work with other branches, replaces the fuse in the branch or the branch is repaired.

Fig. 8 is the structural schematic diagram of another protective switch provided in an embodiment of the present invention, and Fig. 9 is guarantor shown in fig. 8 The rear view of switch is protected, in order to show the internal structure of protective switch, has concealed partial shell in Fig. 9, shown in Fig. 8 and Fig. 9 Protective switch and protective switch above-mentioned it is essentially identical, the difference is that, in protective switch shown in Fig. 8, shell 10 It is inside provided with a cunning storehouse 12 that can be taken off, the setting of fuse 27 is provided with the first contact on the lateral wall in sliding storehouse 12 in sliding storehouse 12 121 and second contact 122, the both ends of fuse 27 are electrically connected with the first contact 121 and the second contact 122 respectively, set on shell 10 Be equipped with third contact 131 and the 4th contact 141, third contact 131 is electrically connected with the second connecting terminal 22, the 4th contact 141 with Moving contact 23 is electrically connected, and when sliding storehouse 12 is placed in shell 10, the first contact 121 is electrically connected with third contact 131, the second touching Point 122 is electrically connected with the 4th contact 141, to can also set the whole taking-up in sliding storehouse 12 when needing replacing fuse 27 Multiple sliding storehouses 12 are set, are provided with fuse 27 in each sliding storehouse 12, so as to which it is molten to reach quick-replaceable by replacing sliding storehouse 12 The purpose of silk 27.

Further, it is additionally provided with post rod mechanism in protective switch, for making to thread off during sliding storehouse 12 is removed Mechanism 25 threads off, so that moving contact 23 be separated with static contact 24, when sliding storehouse 12 is removed, is triggered and is threaded off by post rod mechanism Mechanism 25 threads off, and separates moving contact 23 with static contact 24, it is ensured that the safety of operator puts back to shell 10 that will slide storehouse 12 After interior, then tripping mechanism 25 can be made to reset by resetting-mechanism 29, so that moving contact 23 resumes contacts with static contact 24.

When realization, the first support base 13 for installing third contact 131 can be set on shell 10 and for installing the Second support base 14 of four contacts 141.

Preferably, the first contact 121 and the second contact 122 can be elastic conducting strip, two elastic conducting strip difference It is convex to third contact 131 and the 4th contact 141, is avoided after sliding storehouse 12 is put into shell 10, the first contact 121 and third There is the case where poor contact between contact 131 or between the second contact 122 and the 4th contact 141.

It is contemplated that the setting of fuse holder 31 is in sliding storehouse 12 when fuse 27 is installed by fuse holder 31.

In addition, fuse alarm also can be set in sliding storehouse 12, as shown in figure 8, light emitting diode 32 and current-limiting resistance 33 are arranged on sliding storehouse 12, and specific connection type is identical as protective switch shown in FIG. 1, and and will not be described here in detail.

Specifically, post rod mechanism includes the jacking block 123 being arranged on the lateral wall in sliding storehouse 12 and is arranged in outside sliding storehouse 12 Mandril 50, towards sliding storehouse 12, the other end is provided with inclined-plane on jacking block 123 towards release lever 255 for one end of mandril 50.

As shown in figure 9, being provided with mandril bracket 15 on shell 10, mandril 50 can be movably mounted to mandril along its length On bracket 15, convex block 2552 is provided on release lever 255, during sliding storehouse 12 is removed, jacking block 123 passes through slope driving Mandril 50 is moved along the length direction of mandril 50, so that mandril 50 pushes convex block 2552, rotates release lever 255, to realize Tripping mechanism 25 is threaded off.

Further, reset spring 51 is additionally provided on mandril 50, one end of reset spring 51 is connect with mandril 50, is resetted The other end of spring 51 is connect with mandril bracket 15, and when sliding storehouse 12 is placed in 10 inside of shell, reset spring 51, which is in, to be stretched State can be such that mandril 50 contacts always with the lateral wall in sliding storehouse 12, to guarantee taking out cunning by the way that reset spring 51 is arranged During storehouse 12, jacking block 123 can push mandril 50 mobile.

Optionally, removal handle 124 is provided on sliding storehouse 12, removal handle 124 is arranged on the lateral wall in sliding storehouse 12, tears open It unloads handle 124 and can be convenient and pull out in sliding storehouse 12 from one end of shell 10.

The embodiment of the invention also provides a kind of circuit protection device, which includes at least two aforementioned A kind of protective switch, a protective switch at least two protective switchs are arranged on the main line of circuit, at least two protections Other protective switchs in switch are separately positioned on the branch road connecting with the main line, and the molten of the protective switch on main line is arranged in The rated current of silk is greater than the rated current of the fuse for the protective switch being arranged on branch road, so as to break down in branch When, this branch is disconnected by the protective switch being arranged on branch road, and other branches and main line can still work on.

Specifically, Figure 10 is a kind of structure chart of circuit protection device provided in an embodiment of the present invention, as shown in Figure 10, should Circuit protection device may include three protective switchs above-mentioned (see the first protective switch 41, the second protective switch in Figure 10 42, third protective switch 43), wherein the first protective switch 41 is arranged on main line, and the second protective switch 42 and third protection are opened It closes 43 and is separately positioned on two different branch roads.

It should be noted that in other embodiments, according to the difference of the quantity of branch, can be set more or fewer Protective switch, and a protective switch can be respectively set on each branch road, it can also respectively be set on partial branch wherein Protective switch is set, the present invention is not limited thereto.

Specifically, the rated current of the fuse for the protective switch being arranged in branch and the protective switch being arranged in main line Fuse rated current between ratio can be 1.6~2, thus make the circuit protection device can be adapted for it is most of often The circuit seen.

It is envisioned that for different circuits, above-mentioned ratio be can also be different, in same circuit in different branch Ratio between the rated current of the fuse of protective switch in the rated current and main line of the fuse of protective switch can not also Together.

The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.

Claims (13)

1. a kind of protective switch, the protective switch includes shell (10), and first be arranged in the shell (10) connects Line terminals (21), the second connecting terminal (22), the first bimetal leaf (26), tripping mechanism (25), moving contact (23), static contact (24), which is characterized in that the protection organ further includes fuse (27), first connecting terminal (21) and first pair of gold Belong to piece (26) electrical connection, first bimetal leaf (26) is electrically connected with the static contact (24), moving contact (23) setting On the tripping mechanism (25), first bimetal leaf (26) setting is in the side of the tripping mechanism (25), and described the Two connecting terminals (22) are electrically connected with the moving contact (23) by the fuse (27), the moving contact (23) and the stationary contact When head (24) contact, first connecting terminal (21) and second connecting terminal (22) pass through the static contact (24), institute Moving contact (23) and the fuse (27) electrical connection are stated, first bimetal leaf (26) is when circuit overloads cause temperature to increase The tripping mechanism (25) are bent towards, so that the tripping mechanism (25) is threaded off, thus by the moving contact (23) and the static contact (24) it separates, so that the connection between first connecting terminal (21) and second connecting terminal (22) disconnects, it is described molten Silk (27) fuses in the short circuit, so that between first connecting terminal (21) and second connecting terminal (22) Connection disconnect.

2. protective switch according to claim 1, which is characterized in that the fuse (27) and second connecting terminal (22) it is electrically connected between by the second bimetal leaf (28), second bimetal leaf (28) is arranged in the tripping mechanism (25) The other side, second bimetal leaf (28) bends towards the tripping mechanism (25) when heated.

3. protective switch according to claim 1, which is characterized in that first connecting terminal (21) is U-shaped elasticity gold Belong to piece or screw connecting terminal, second connecting terminal (22) is U-shaped elastic sheet metal or screw connecting terminal.

4. protective switch according to claim 3, which is characterized in that the U-shaped elastic sheet metal includes bottom and connection Two side arms at the both ends of the bottom are correspondingly arranged on bulge-structure (211) on the opposite two sides of the two side arms.

5. protective switch according to claim 1, which is characterized in that the protective switch further includes being arranged in the shell (10) the remote cabling terminal (51) on, one end of the remote cabling terminal (51) and one end of the fuse (27) are electrically connected It connects.

6. protective switch according to claim 1-5, which is characterized in that the tripping mechanism (25) includes first Connecting rod (251), second connecting rod (252), third connecting rod (253), fourth link (254) and release lever (255), the first connecting rod (251) it is rotatably connected in the middle part of on the shell (10), the moving contact (23) is arranged the one of the first connecting rod (251) End, one end of the other end and the second connecting rod (252) of the first connecting rod (251) is hinged, the second connecting rod (252) The other end and the one end of the third connecting rod (253) are hinged, and the other end face of the second connecting rod (252) is equipped with the first lock Conjunction face (2521), the other end of the third connecting rod (253) and one end of the fourth link (254) are hinged, and the described 4th connects The other end of bar (254) is rotatably connected on the shell (10), is provided with elastic energy storage element on the fourth link (254) (256), the elastic energy storage element (256) is used to provide the first torque, the first connecting rod for the fourth link (254) (251), the rotational plane of the second connecting rod (252), the third connecting rod (253) and the fourth link (254) is mutually flat Row, the release lever (255) and the first connecting rod (251) are arranged with shaft, and one end of the release lever (255) is equipped with and institute The compatible second sealed face (2551) of the first sealed face (2521) is stated, is arranged on the release lever (255) and has elastic component (257), the elastic element (257) is used to provide the second torque, first torque and described for the release lever (255) Two torques it is contrary.

7. protective switch according to claim 6, which is characterized in that correspond to the first connecting rod on the shell (10) (251) position is additionally provided with limited block (11), when the moving contact (23) and the static contact (24) contact, the limit Block (11) and the first connecting rod (251) mutually from, when the moving contact (23) is separated with the static contact (24), described first Connecting rod (251) is resisted against on the limited block (11).

8. protective switch according to claim 1-5, which is characterized in that the protective switch further includes for controlling Make the resetting-mechanism (29) of the tripping mechanism (25) reset.

9. protective switch according to claim 1-5, which is characterized in that the protective switch further includes fusing report Alert device, the fuse alarm is in parallel with the fuse (27), and the fuse alarm is used for when the fuse (27) fuse It sounds an alarm.

10. protective switch according to claim 1-5, which is characterized in that be provided with one in the shell (10) The cunning storehouse (12) that can be taken off, fuse (27) setting are arranged on the lateral wall of the sliding storehouse (12) in the sliding storehouse (12) Have the first contact (121) and the second contact (122), the both ends of the fuse (27) respectively with first contact (121) and institute The second contact (122) electrical connection is stated, is provided with third contact (131) and the 4th contact (141) on the shell (10), described the Three contacts (131) are electrically connected with second connecting terminal (22), and the 4th contact (141) is electrically connected with the moving contact (23) Connect, when the sliding storehouse (12) be placed on the shell (10) it is interior when, first contact (121) and the third contact (131) Electrical connection, second contact (122) are electrically connected with the 4th contact (141).

11. protective switch according to claim 10, which is characterized in that be additionally provided with mandril machine in the protective switch Structure, for during the sliding storehouse (12) is removed, making the tripping mechanism (25) to thread off, thus by the moving contact (23) it is separated with the static contact (24).

12. a kind of circuit protection device, which is characterized in that the circuit protection device includes at least two claims 1~11 Described in any item protective switchs, a protective switch at least two protective switch are arranged on the main line of circuit, Other protective switchs at least two protective switch are separately positioned on the branch road connecting with the main line, are arranged in institute The rated current for stating the fuse of the protective switch on main line is specified greater than the fuse for the protective switch being arranged on the branch road Electric current.

13. circuit protection device according to claim 12, which is characterized in that the protective switch on the main line is arranged in The rated current of fuse and the ratio of the rated current for the fuse of protective switch being arranged on the branch road be 1.6~2.0.