CN107039218A - A kind of protection switch and circuit protection device - Google Patents

Abstract

The invention discloses a kind of protection switch and circuit protection device, belong to electric switch field.The protection switch includes housing, and the first binding post of setting in the housing, second binding post, first bimetal leaf, tripping mechanism, moving contact, static contact and fuse, first binding post is electrically connected with the first bimetal leaf, first bimetal leaf is electrically connected with static contact, moving contact is arranged on tripping mechanism, first bimetal leaf is arranged on the side of tripping mechanism, second binding post is electrically connected with moving contact by fuse, first bimetal leaf bends towards tripping mechanism when circuit overloads cause temperature to raise, tripping mechanism is set to thread off, so as to which moving contact be separated with static contact, so that the connection between the first binding post and the second binding post disconnects, so as to play a part of overload protection, fuse fuses in short circuit, so that the connection between the first binding post and the second binding post disconnects, so as to play a part of short-circuit protection.

Description

A kind of protection switch and circuit protection device

Technical field

The present invention relates to electric switch field, more particularly to a kind of protection switch and circuit protection device.

Background technology

Protection switch is a kind of safety device connected in circuit, primarily to disconnecting electricity in overload or short circuit Road, it is to avoid circuit is damaged.

Conventional protection switch generally comprises bimetal leaf, tripping mechanism, electromagnet, moving contact and static contact at present, takes off Buckle mechanism is used to control contact or separation of the moving contact with static contact, in circuit overloads, can be deformed because bimetal leaf is heated, Tripping mechanism is triggered during bi-metal plate deformed, so that moving contact and static contact separation, reach the purpose of disconnecting circuit, When there is short circuit in circuit, electromagnet absorption motion unshakable in one's determination so that iron core hits tripping mechanism, makes tripping mechanism thread off, so that So that moving contact and static contact separation, make circuit disconnect rapidly.

Due to needing to set electromagnet, therefore it can make it that the volume of protection switch is larger, while in order to avoid producing electric arc, Also need to set arc-control device in protection switch, moving contact and static contact are also required to use and can bear the knot of larger electric arc destruction Structure, this just further increases the volume of protection switch, adds production cost.

The content of the invention

Big in order to solve existing protection switch volume, cost is high, and electric arc occurs when by electromagnet break contact The problem of, the embodiments of the invention provide a kind of protection switch and circuit protection device.The technical scheme is as follows：

On the one hand, the embodiments of the invention provide a kind of protection switch, the protection switch includes housing, and is arranged on The first binding post, the second binding post, the first bimetal leaf, tripping mechanism, moving contact, static contact in the housing and molten Silk, first binding post is electrically connected with first bimetal leaf, and first bimetal leaf is electrically connected with the static contact Connect, the moving contact is arranged on the tripping mechanism, first bimetal leaf is arranged on the side of the tripping mechanism, institute The second binding post is stated to electrically connect by the fuse with the moving contact, when the moving contact and static contact contact, institute State the first binding post and second binding post to electrically connect by the static contact, the moving contact and the fuse, institute State the first bimetal leaf and the tripping mechanism is bent towards when circuit overloads cause temperature to raise, the tripping mechanism is threaded off, from And separate the moving contact with the static contact so that the company between first binding post and second binding post Connect disconnection, the fuse fuses in the short circuit so that first binding post and second binding post it Between connection disconnect.

By setting the first bimetal leaf between the first binding post and static contact so that when circuit overloads, first Bimetal leaf produces deformation because temperature is raised, so as to trigger tripping mechanism so that moving contact and static contact separation, so as to play The effect of overload protection, by setting fuse between the second binding post and moving contact so that when occurring short circuit in circuit, Fuse failure, circuit is disconnected, so that play a part of short-circuit protection, simultaneously because disconnect circuit by the fuse that fuses, and Electromagnet need not be set, therefore arc-control device need not be set, so as to reduce the volume of protection switch, and reduce and be produced into This, usual fuse is that may be used as overload protection to may be used as short-circuit protection again, design fuse when it needs to be determined that fuse melt Disconnected characteristic, including size of current, fusing time length during fusing etc., when fuse is used as overload protection, for operating chacteristics Precise requirements it is higher, cost is of a relatively high, and when fuse be used as short-circuit protection when, for the precise requirements of operating chacteristics Then relatively low, cost is relatively low, and fuse only provides short-circuit protection in the application, therefore can reduce certain cost.

Alternatively, the electric current that fuse can be in circuit fuses when reaching 4~12 times of rated current.

Preferably, fused when the 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, electrically connected between the fuse and second binding post by the second bimetal leaf, described second Bimetal leaf is arranged on the opposite side of the tripping mechanism, 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 so that protection switch can be in the first bimetal leaf and the Any one in two bimetal leafs occurs disconnecting circuit during temperature rise.

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

Further, the U-shaped elastic sheet metal includes bottom and is connected to the two side arms at the two ends of the bottom, institute State and be correspondingly arranged on bulge-structure on the relative two sides of two side arms, can be by the wire in circuit by two bulge-structures It is stuck in U-shaped elastic sheet metal, while electricity can also be made by bending the spacing between two side arms, two bulge-structures of adjustment Wire in road can be preferably stuck in U-shaped elastic sheet metal.

Circuit is caused to disconnect in order to avoid the wire in circuit is deviate from from the first binding post, can be in circuit A binding post is connected on wire, binding post is inserted into the first binding post and is attached, while binding post can be set It is the thick middle thin or thin structure in the thick one end in one end in two ends, the thicker one end of binding post is inserted into the first binding post, Coordinated by bulge-structure and binding post, improve the reliability of connection, the possibility of reduction binding post abjection.

Alternatively, the tripping mechanism includes first connecting rod, second connecting rod, third connecting rod, fourth link and release lever, institute State and be rotatably connected in the middle part of first connecting rod on the housing, the moving contact is arranged on one end of the first connecting rod, described One end of the other end of first connecting rod and the second connecting rod is hinged, the other end of the second connecting rod and the third connecting rod One end is hinged, and the other end end face of the second connecting rod is provided 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 of the fourth link is rotatably connected on the housing, is set in the fourth link Flexible energy-storage travelling wave tube, the elastic energy storage element is 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 set with rotating shaft, and one end of the release lever is provided with the second sealed face being adapted with the described first sealed face, described de- Set and have elastic component on button bar, the flexible member is used to provide the second torque for the release lever, first torque with Second torque it is in opposite direction.

Preferably, the position of the correspondence first connecting rod is additionally provided with limited block on the housing, when the moving contact with During static contact contact, the limited block and the first connecting rod from, when the moving contact is separated with the static contact, The first connecting rod is resisted against on the limited block.

Alternatively, the protection switch also includes resetting-mechanism, and the resetting-mechanism is used to control the tripping mechanism to answer Position, makes the moving contact be resumed contacts with the static contact, in addition, the decrement of flexible member should be controlled, to avoid first Behind sealed face and the second sealed face separation, the angle that release lever is rotated is excessive, and causes when being resetted to tripping mechanism, difficult So that second connecting rod is pressed between first connecting rod and release lever again.

In order to improve the protecting effect of protection switch, the protection switch also includes fuse alarm, the fusing alarm Device is in parallel with the fuse, and the fuse alarm is used to send alarm in the fuse failure, to inform work people in time Member's circuit produces failure, reminds staff to be placed under repair in time to circuit.

Alternatively, the fuse alarm includes light emitting diode, in addition, fuse alarm can also be using other reports Police's formula, for example, combination using buzzer or buzzer and light emitting diode etc., type of alarm is generally with can be at this Allow staff to be known as principle in time in working environment to be selected.

Preferably, a cunning storehouse that can be taken off is provided with the housing, 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 two ends of the fuse respectively with first contact and described Two contacts are electrically connected, and the 3rd contact and the 4th contact, the 3rd contact and second terminals are provided with the housing Son electrical connection, the 4th contact is electrically connected with the moving contact, when the sliding storehouse is placed in the housing, and described first Contact is electrically connected with the 3rd contact, and second contact is electrically connected with the 4th contact so that can take out sliding storehouse Afterwards, the replacing of fuse is carried out.

Further, post rod mechanism is additionally provided with the protection switch, during being removed in the sliding storehouse, 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 on the sliding storehouse Outer push rod, one end of the push rod is towards the sliding storehouse, and the other end is provided with tiltedly on the jacking block towards the release lever Face, during being removed in sliding storehouse, jacking block is moved by slope driving push rod along the length direction of push rod so that push rod is promoted Release lever is rotated, so that tripping mechanism is threaded off.

On the other hand, the embodiment of the present invention additionally provides a kind of circuit protection device, and the circuit protection device is included extremely A protection switch in few two foregoing any protection switch, at least two protection switch is arranged on the main line of circuit On, other protection switch at least two protection switch are separately positioned on the branch road being connected with the main line, are set The rated current of the fuse of protection switch on the main line is more than the fuse for the protection switch being arranged on the branch road Rated current.

In actual applications, due to the difference of circuit structure, the quantity for the protection switch that circuit protection device includes also may be used Can be different, a protection switch can be respectively provided with each branch road, can also only wherein to provide the security of circuit Protection switch is set in the branch road relatively easily broken down, to reduce cost.

Brief description of the drawings

Technical scheme in order to illustrate the embodiments of the present invention more clearly, makes required in being described below to embodiment Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings Accompanying drawing.

Fig. 1 is a kind of structural representation of protection switch provided in an embodiment of the present invention；

Fig. 2 is a kind of connection 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 view 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 representation of another protection switch provided in an embodiment of the present invention；

Fig. 9 is the rear view of the protection 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.

Embodiment

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

Fig. 1 is a kind of structural representation of protection switch provided in an embodiment of the present invention, as shown in figure 1, the protection switch Including housing 10, and set the first binding post 21 in the housing 10, the second binding post 22, the first bimetal leaf 26, Tripping mechanism 25, moving contact 23, static contact 24 and fuse 27, the first binding post 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 first bimetal leaf 26 is arranged on The side of tripping mechanism, the second binding post 22 is electrically connected with moving contact 23 by fuse 27, and moving contact 23 and static contact 24 connect When touching, the first binding post 21 and the second binding post 22 are electrically connected by static contact 24, moving contact 23 and fuse 27, first pair Sheet metal 26 bends towards tripping mechanism 25 when circuit overloads cause temperature to raise, and tripping mechanism 25 is threaded off, so that by moving contact 23 separate with static contact 24, disconnect the connection between the first binding post 21 and the second binding post 22, fuse 27 is in circuit Fused when short-circuit, disconnect the connection between the first binding post 21 and the second binding post 22.

By setting the first bimetal leaf between the first binding post and static contact so that when circuit overloads, first Bimetal leaf produces deformation because temperature is raised, so as to trigger tripping mechanism so that moving contact and static contact separation, so as to play The effect of overload protection, by setting fuse between the second binding post and moving contact so that when occurring short circuit in circuit, Fuse failure, circuit is disconnected, so that play a part of short-circuit protection, simultaneously because disconnect circuit by the fuse that fuses, and Electromagnet need not be set, therefore arc-control device need not be set, while reduce the volume of protection switch, and reduce and be produced into This, usual fuse is that may be used as overload protection to may be used as short-circuit protection again, design fuse when it needs to be determined that fuse melt Disconnected characteristic, including size of current, fusing time length during fusing etc., when fuse is used as overload protection, for operating chacteristics Precise requirements it is higher, cost is of a relatively high, and when fuse be used as short-circuit protection when, for the precise requirements of operating chacteristics Then relatively low, cost is relatively low, and fuse only provides short-circuit protection in the application, therefore can reduce certain cost.

Alternatively, the electric current that fuse can be in circuit fuses when reaching 4~12 times of rated current.

Preferably, fused when the 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 realizing, a pair of fuse holders 31 are also provided with housing 10, the two ends of fuse 27 are fastened on corresponding fuse holder In 31, the two ends of fuse 27 are electrically connected with the binding post 22 of moving contact 23 and second respectively by fuse holder 31, and fuse holder 31 can To facilitate the installation and replacing of fuse 27.

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

As shown in figure 1, being electrically connected between fuse 27 and the second binding post 22 by the second bimetal leaf 28, second pair of gold Category piece 28 is arranged on the opposite side of tripping mechanism 25, and the second bimetal leaf 28 bends towards tripping mechanism 25 when heated, passes through setting When second bimetal leaf 28 can to occur loose contact at the second binding post 22 and cause local electrical resistance increase, second Bimetal leaf 28 produces deformation, tripping mechanism 25 is threaded off, so that moving contact 23 is separated with static contact 24, so as to avoid the Occur constant temperature rise or even situation about burning at two binding posts 22, further increase the security of circuit.

Specifically, bimetal leaf refers to by the sheet metal of the different metal or alloy laminating of two kinds of thermal coefficient of expansions, Because two kinds of thermal expansion metal coefficients for constituting bimetal leaf are different, therefore when the temperature of bimetal leaf changes, double gold Category piece will produce deformation, when realizing, the material for constituting the first bimetal leaf 26 and the material for constituting the second bimetal leaf 28 can With it is identical can also be different.

, can also be it should be noted that bimetal leaf can be deformed upon when residing environment temperature changes Electric current on bimetal leaf is deformed upon when increasing and causing the temperature of bimetal leaf to raise.

Alternatively, when bimetal leaf can increase to the rated current of 2 times of circuits in electric current, tripping mechanism 25 is triggered, To cause moving contact 23 to be disconnected with static contact 24.

When realizing, the first bimetal leaf 26 and the second bimetal leaf 28 are equal between tripping mechanism 25 when not deforming upon Gap is provided with, because gap is bigger, the first bimetal leaf 26 and the second bimetal leaf 28 are accomplished by producing 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, can be by adjusting the size and the second bimetal leaf 28 in the gap between the first bimetal leaf 26 and tripping mechanism 25 with taking off The size in the gap between buckle mechanism 25 each triggers tripping mechanism to adjust the first bimetal leaf 26 and the second bimetal leaf 28 Temperature when 25, the need for adapting to difference.

Preferably, protection switch also includes fuse alarm, and fuse alarm is in parallel with fuse 27, and fuse alarm is used for Alarm is sent when fuse 27 fuses, when fuse 27 does not fuse, because 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 sends alarm, so as to molten in fuse 27 User is reminded to check circuit and change fuse 27 in time when disconnected.

Specifically, fuse alarm can include light emitting diode 32, and the small volume of light emitting diode 32 is easily installed in shell On body 10.

When realizing, light emitting diode 32 can be arranged on the side wall of housing 10, respective leds 32 on housing 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, because light emitting diode 32 has One-way conduction, therefore after the fusing of fuse 27, light emitting diode 32 can constantly flash, it is easier to cause the attention of user, In addition two light emitting diodes 32 can also be connected in reverse parallel in the two ends of fuse 27, so after the fusing of fuse 27, two light Diode 32 can alternately flash, and the frequency of flicker is consistent with the frequency of electric current.

In DC circuit, two light emitting diodes 32 can also be connected in reverse parallel in the two ends of fuse 27, so as to protect Card has a light emitting diode 32 to keep the state of continuous illumination all the time 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, is led to Setting current-limiting resistance 33 is crossed, the electric current in circuit can be reduced, it is to avoid light emitting diode 32 burns with the resistance of increasing circuit.

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

Further, the protection switch also includes setting remote cabling terminal 51 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 connected with remote alarming device, is passed through Remote cabling terminal 51 is connected with remote alarming device can realize the remote monitoring of protection switch.

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

Fig. 2 is a kind of connection diagram of remote alarming device provided in an embodiment of the present invention, is connected with the remote alarms The protection switch of device 52 can be connected in DC circuit, should be as shown in Fig. 2 protection switch 40 is connected to the negative of dc source 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, and 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 First resistor R1 one end electrical connection, the first resistor R1 other end is electrically connected with second resistance R2 one end, second resistance R2 The other end ground connection or be connected with the negative pole of dc source, voltage monitoring can be connected between first resistor R1 and second resistance R2 Module 54, when fuse 27 does not fuse, because the resistance of fuse 27 is small, remote cabling terminal 51 and ground or the negative pole of dc source Between voltage be 0, therefore the magnitude of voltage that monitors of voltage monitoring module 54 is 0, when fuse 27 fuses, remote cabling terminal Voltage between 51 and ground or the negative pole of dc source can increase suddenly so that the magnitude of voltage that voltage monitoring module 54 is monitored is big In 0.Therefore it can judge whether fuse 27 fuses by the change of the monitoring voltage value of voltage monitoring module 54.

Preferably, the first binding post 21 is U-shaped elastic sheet metal or screw connecting terminal, and the second binding post 22 is U Shape elastic sheet metal or screw connecting terminal, can facilitate and access protection switch in circuit.

Specifically, as shown in figure 1, the first binding post 21 can be U-shaped elastic sheet metal, U-shaped elastic sheet metal and the One bimetal leaf 26 is electrically connected, when protection switch is linked into circuit, can be directly by the wire in circuit or wiring Post is inserted into U-shaped elastic sheet metal, is easy to connection.

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

It can be provided for installing when realizing, on housing 10 on the mounting groove of first binding post 21, the side wall of housing 10 Then it is provided with the opening being inserted into for the wire or binding post in the road that powers in the first binding post 21.

In the present embodiment, the second binding post 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, with reference to Fig. 1 and Fig. 3, the second binding post 22 can include junction block 221 and fixing screws 222, the screw being adapted with fixing screws 222 is provided with junction block 221, and junction block 221 can include base 221a, fixation Conducting block 221b on the base 221a and pressing plate 221c, conducting block 221b and being rotatably arranged on base 221a Two bimetal leafs 28 are electrically connected, and pressing plate 221c is oppositely arranged with conducting block 221b, and pressing plate 221c is in first position and the second place Between rotate, spacing of the pressing plate 221c at first position between conducting block 221b is more than at the second place 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, which is turned in the second place, Fig. 3, to be shown second after fixing screws 222 are back-outed The state of binding post 22, now pressing plate 221c to the side of fixing screws 222 rotate, increase pressing plate 221c and conducting block 221b Between spacing, take out the wire of insertion, Fig. 4 is that the screw after fixing screws provided in an embodiment of the present invention are screwed into connects The view of line terminals, as shown in figure 4, when fixing screws 222 are tightened into junction block 221, fixing screws 222 can lead to Cross side wall and push pressing plate 221c so that the hypotelorism between pressing plate 221c and conducting block 221b, so as to leading insertion Line is pressed on conducting block 221b.

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

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

In addition, foregoing 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 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 It is rotatably connected on housing 10, moving contact 23 is arranged on one end of first connecting rod 251, the other end of first connecting rod 251 and second 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 provided 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 of connecting rod 254 is rotatably connected on housing 10, and elastic energy storage element 256, elastic energy storage are provided with fourth link 254 Element 256 is used to provide the first torque, first connecting rod 251, second connecting rod 252, third connecting rod 253 and for fourth link 254 The rotational plane of double leval jib 254 is parallel to each other, and release lever 255 is set with first connecting rod 251 with rotating shaft, one end of release lever 255 Have elastic component 257, elasticity are set provided with the second sealed face 2551 being adapted with the first sealed face 2521, on release lever 255 Element 257 is used to provide the second torque for release lever 255, the first torque and the second torque it is in opposite direction.

When realizing, housing 10 can include the bottom plate for being used to install tripping mechanism 25, first connecting rod 251 and release lever 255 It can be rotatably connected on by the first straight pin 25a being vertically fixed on bottom plate on bottom plate, first connecting rod 251 and second connecting rod 252 can be by the second straight pin 25b connections, and fourth link 254 can be by the 3rd 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 connecting rods 253 can include always bar portion 2531 and with two connecting portion 2532 connected vertically of straight-bar portion 2531, two connecting portions 2532 parallel intervals are set, and two connecting portions 2532 are plugged in the circular hole being adapted in second connecting rod 252 and fourth link 254 respectively In, and the first straight pin 25a, the second straight pin 25b, connecting portion 2532, the 3rd straight pin 25c are mutually parallel.

Specifically, the first pushing part for promoting release lever 255 to be rotated to same direction can be provided 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 Both sides, the first pushing part 255a promotes release lever 255 to rotate in the presence of the deformation of the first bimetal leaf 26, the second pushing part 255b promotes release lever 255 to be rotated to identical direction in the presence of the deformation of the second bimetal leaf 28.

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 is provided, the tripping mechanism 25 that Fig. 7 is shown, which is in, makes moving contact 23 and static contact The state of 24 separation, the dropout process of tripping mechanism provided in an embodiment of the present invention is briefly described with reference to Fig. 5 and Fig. 7：

Reference picture 5, release lever 255 is in the presence of the second torque that flexible member 257 is provided, to first connecting rod 251 Direction (in Fig. 5 counterclockwise) is rotated so that the second sealed face 2551 is pressed on the first sealed face 2521, so as to pass through the Two connecting rods 252 promote first connecting rod 251 to turn to moving contact 23 and contacted with static contact 24, simultaneously because now elastic energy storage element 256 elastic force is not enough to pull second connecting rod 252 to make the first sealed face 2551 in sealed face 2521 and second by third connecting rod 253 Separation, therefore moving contact 23 and static contact 24 can keep the state of contact, when the first bimetal leaf 26 or the second bimetal leaf When any one in 28 deforms upon and promotes release lever 255,28 pair first of the first bimetal leaf 26 or the second bimetal leaf The torque of the thrust of connecting rod 251 and the second torque are in opposite direction so that the pressure in the second sealed sealed face 2521 in 2551 pair first of face Clamp force reduces, when reducing to a certain extent, and 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 Rotate, moving contact 23 is separated with static contact 24, tripping mechanism 25 moves to the 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 Apply in example, the tripping mechanism of other structures can also be used, the present invention is not limited thereto.

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

Alternatively, support column 25d is additionally provided with housing 10, flexible member 257 can be torsion spring, and one end of torsion spring is fixed It is connected on release lever 255, the other end is connected on support column 25d, is easily installed and changes.

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

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

Preferably, the position of correspondence first connecting rod 251 is additionally provided with limited block 11 on housing 10, when moving contact 23 and stationary contact During first 24 contact, limited block 11 is with first connecting rod 251 from when moving contact 23 is separated with static contact 24, first connecting rod 251 is supported Lean against on limited block 11, so as to avoid the rotational angle of first connecting rod 251 excessive.

Further, protection switch also includes resetting-mechanism 29, and resetting-mechanism 29 is used to control tripping mechanism 25 to reset, made Moving contact 23 resumes contacts with static contact 24, so as to facilitate the reset of tripping mechanism 25, protection switch is made repeatedly With.

Specifically, resetting-mechanism 29 can include being correspondingly arranged on reseting handle 291, housing 10 for installing again 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 housing 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 are separated, and passes through reseting handle 291 and promotes fourth link 254 rotate, so as to promote third connecting rod 253, then promote second connecting rod 252 by third connecting rod 253 so that second connecting rod 252 is pushed away Dynamic first connecting rod 251 turns to moving contact 23 and contacted with static contact 24, and causes second connecting rod 252 to be stuck in the He of first connecting rod 251 Between second connecting rod 252, the second sealed face 2551 is pressed on the first sealed face 2521, so as 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, so that Both by pressing reseting handle 291 tripping mechanism 25 can be controlled to reset, again can be by pulling reseting handle 291 manually will Moving contact 23 and static contact 24 are separated, and are disconnected circuit when changing fuse 27 with facilitating, when protection switch is arranged on circuit When in branch road, 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 of all continuing normal work with other branch roads, change the fuse in the branch road or the branch road is repaired.

Fig. 8 is the structural representation of another protection switch provided in an embodiment of the present invention, and Fig. 9 is the guarantor shown in Fig. 8 The rear view of switch is protected, partial shell has been concealed in the internal structure of protection switch, Fig. 9 in order to show, shown in Fig. 8 and Fig. 9 Protection switch and foregoing protection switch it is essentially identical, difference is, in the protection switch shown in Fig. 8, housing 10 A cunning storehouse 12 that can be taken off inside is provided with, fuse 27 is arranged in sliding storehouse 12, the first contact is provided with the lateral wall in sliding storehouse 12 121 and second contact 122, the two ends of fuse 27 electrically connect with the first contact 121 and the second contact 122, set on housing 10 respectively Be equipped with the 3rd contact 131 and the 4th contact 141, the 3rd contact 131 is electrically connected with the second binding post 22, the 4th contact 141 with Moving contact 23 is electrically connected, and when sliding storehouse 12 is placed in housing 10, the first contact 121 is electrically connected with the 3rd contact 131, and second touches Point 122 is electrically connected with the 4th contact 141, so as to when needing to change fuse 27, can also set the overall taking-up in sliding storehouse 12 Multiple sliding storehouses 12 are put, fuse 27 is provided with each sliding storehouse 12, so as to by changing sliding storehouse 12, reach that quick-replaceable melts The purpose of silk 27.

Further, post rod mechanism is additionally provided with protection switch, during being removed in sliding storehouse 12, makes dropout Mechanism 25 threads off, so that moving contact 23 be separated with static contact 24, when being removed in sliding storehouse 12, is triggered and threaded off by post rod mechanism Mechanism 25 is threaded off, and moving contact 23 is separated with static contact 24, it is ensured that the safety of operating personnel, and sliding storehouse 12 is being put back into housing 10 After interior, then it can reset tripping mechanism 25 by resetting-mechanism 29, to cause moving contact 23 to be resumed contacts with static contact 24.

The first support base 13 of the 3rd contact 131 can be provided for installing when realizing, on housing 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 the 3rd contact 131 and the 4th contact 141, it is to avoid after being put into sliding storehouse 12 in housing 10, the first contact 121 and the 3rd There is the situation of loose contact between contact 131 or between the second contact 122 and the 4th contact 141.

It is contemplated that when fuse 27 is installed by fuse holder 31, fuse holder 31 is arranged in sliding storehouse 12.

In addition, fuse alarm can also be arranged 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 its specific connected mode is identical with the protection switch shown in Fig. 1, is no longer described in detail herein.

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

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

Further, back-moving spring 51 is additionally provided with push rod 50, one end of back-moving spring 51 is connected with push rod 50, resetted The other end of spring 51 is connected with push rod support 15, and when sliding storehouse 12 is positioned over 10 inside of housing, back-moving spring 51 is in stretching State, by setting back-moving spring 51 to contact lateral wall of the push rod 50 all the time with sliding storehouse 12, so as to ensure taking out cunning During storehouse 12, jacking block 123 can promote push rod 50 to move.

Alternatively, removal handle 124 is provided with sliding storehouse 12, removal handle 124 is arranged on the lateral wall in sliding storehouse 12, torn open Unload handle 124 and can facilitate and pull out in sliding storehouse 12 from one end of housing 10.

The embodiment of the present invention additionally provides a kind of circuit protection device, and the circuit protection device includes at least two foregoing A protection switch in a kind of protection switch, at least two protection switch is arranged on the main line of circuit, at least two protections Other protection switch in switch are separately positioned on the branch road being connected with the main line, the protection switch being arranged on main line it is molten The rated current of silk is more than the rated current of the fuse for the protection switch being arranged on branch road, so as to be broken down in branch road When, this branch road is disconnected by the protection switch being arranged on branch road, and other branch roads 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 can include three foregoing protection switch (see the first protection switch 41, the second protection switch in Figure 10 42nd, the 3rd protection switch 43), wherein, the first protection switch 41 is arranged on main line, and the second protection switch 42 and the 3rd protection are opened 43 are closed to be separately positioned on two different branch roads.

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

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

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

The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and Within principle, any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.

Claims (13)

1. a kind of protection switch, it is characterised in that the protection switch includes housing (10), and is arranged on the housing (10) In the first binding post (21), the second binding post (22), the first bimetal leaf (26), tripping mechanism (25), moving contact (23), static contact (24) and fuse (27), first binding post (21) electrically connect with first bimetal leaf (26), institute State the first bimetal leaf (26) to electrically connect with the static contact (24), the moving contact (23) is arranged on the tripping mechanism (25) On, first bimetal leaf (26) is arranged on the side of the tripping mechanism (25), second binding post (22) and institute Moving contact (23) is stated to electrically connect by the fuse (27), it is described when the moving contact (23) and the static contact (24) contact First binding post (21) and second binding post (22) pass through the static contact (24), the moving contact (23) and described Fuse (27) is electrically connected, and first bimetal leaf (26) bends towards the tripping mechanism when circuit overloads cause temperature to raise (25) tripping mechanism (25), is made to thread off, so that the moving contact (23) be separated with the static contact (24) so that described Connection between first binding post (21) and second binding post (22) disconnects, and the fuse (27) is short in the circuit Fused during road so that the connection between first binding post (21) and second binding post (22) disconnects.

2. protection switch according to claim 1, it is characterised in that the fuse (27) and second binding post (22) electrically connected between by the second bimetal leaf (28), second bimetal leaf (28) is arranged on the tripping mechanism (25) Opposite side, second bimetal leaf (28) bends towards the tripping mechanism (25) when heated.

3. protection switch according to claim 1, it is characterised in that first binding post (21) is U-shaped elasticity gold Belong to piece or screw connecting terminal, second binding post (22) is U-shaped elastic sheet metal or screw connecting terminal.

4. protection switch according to claim 3, it is characterised in that the U-shaped elastic sheet metal includes bottom and connection Bulge-structure (211) is correspondingly arranged on two side arms at the two ends of the bottom, the relative two sides of the two side arms.

5. protection switch according to claim 1, it is characterised in that the protection switch also includes being arranged on the housing (10) the remote cabling terminal (51) on, one end and one end of the fuse (27) of the remote cabling terminal (51) are electrically connected Connect.

6. the protection switch according to claim any one of 1-5, it is characterised 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 housing (10), the moving contact (23) is arranged on 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 end face of the second connecting rod (252) is provided 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 housing (10), and elastic energy storage element is provided with 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 put down OK, the release lever (255) is set with the first connecting rod (251) with rotating shaft, and one end of the release lever (255) is provided with and institute State to set on the second sealed face (2551) that the first sealed face (2521) is adapted, the release lever (255) and have elastic component (257), the flexible member (257) is used to provide the second torque, first torque and described for the release lever (255) Two torques it is in opposite direction.

7. protection switch according to claim 6, it is characterised in that the correspondence first connecting rod on the housing (10) (251) position is additionally provided with limited block (11), described spacing when the moving contact (23) is contacted with the static contact (24) Block (11) and the first connecting rod (251) 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. the protection switch according to claim any one of 1-5, it is characterised in that the protection switch also includes being used to control Make the resetting-mechanism (29) of the tripping mechanism (25) reset.

9. the protection switch according to claim any one of 1-5, it is characterised in that the protection switch also 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) fuses Send alarm.

10. the protection switch according to claim any one of 1-5, it is characterised in that be provided with one in the housing (10) The cunning storehouse (12) that can be taken off, the fuse (27) is arranged in the sliding storehouse (12), is set on the lateral wall of the sliding storehouse (12) Have the first contact (121) and the second contact (122), the two ends of the fuse (27) respectively with first contact (121) and institute The second contact (122) electrical connection is stated, the 3rd contact (131) and the 4th contact (141) is provided with the housing (10), described the Three contacts (131) are electrically connected with second binding post (22), and the 4th contact (141) is electrically connected with the moving contact (23) Connect, when the sliding storehouse (12) be placed on the housing (10) it is interior when, first contact (121) and the 3rd contact (131) Electrical connection, second contact (122) electrically connects with the 4th contact (141).

11. protection switch according to claim 10, it is characterised in that push rod machine is additionally provided with the protection switch Structure, during being removed in the sliding storehouse (12), makes the tripping mechanism (25) thread off, so that by the moving contact (23) separated with the static contact (24).

12. a kind of circuit protection device, it is characterised in that the circuit protection device includes at least two claims 1~11 A protection switch in protection switch described in any one, at least two protection switch is arranged on the main line of circuit, Other protection switch at least two protection switch are separately positioned on the branch road being connected with the main line, are arranged on institute The rated current for stating the fuse of the protection switch on main line is more than the specified of the fuse that is arranged on protection switch on the branch road Electric current.

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