CN102097258A - Switching device having a contact welding indicator - Google Patents

Abstract

A switching device in the invention has movable main contacts (47, 48) supported by contact arms (203, 204), a tripping mechanism (51), a manually-resetting device (40), a tripping device (41) acting on the contact arms via the tripping mechanism, and a mechanism for instructing welding of the contacts, the switching device is characterized in that, the instruction mechanism comprises a locking bar (231) coupled to the contact arms to locate a locking position of the locking bar when the contacts close, the locking bar (231) is provided with a hook (243) disposed to fix the manually-resetting device (40) in a middle position when the locking bar is at the locking position and after tripping of the switching device.

Description

Switching device with contact melting welding indicating device

Technical field

The present invention relates to be used for electric equipment, generally is the protective device field of low-voltage equipment.These devices generally are used for being installed in the electric terminal distribution board.

Especially, the present invention relates to switching device, this switching device comprises:

Movable main contact, it is supported by contact arm and cooperates with static main contact in make position,

Tripping mechanism, it acts on the described contact arm,

Manual reseting device, it acts on the described contact arm via described tripping mechanism and can occupy the position and the position of representing described device to thread off of the setting of the described device of representative,

Trip gear, it acts on the described contact arm via described tripping mechanism, and

Be used to indicate the mechanism of described main contact melting welding, it acts on the described manual reseting device and has described main contact melting welding so that described manual reseting device occupies the centre position to show.

Background technology

French patent application FR2649826 describes a kind of circuit breaker that is provided with controlling organization, comprise the handle that resets that can activate between limit closure and open position, the melting welding that is provided with the tripping mechanism of the release lever on the contact that acts on described circuit breaker and shows the described contact that cooperates with described release lever is to stop at handle the indicating device in centre position when being in closed melting welding state when contact.

A shortcoming of such circuit breaker is, is used to indicate the indicating device of the closed melting welding state of contact to actuate by the tripping mechanism that is positioned at the described contact certain distance of distance.

French patent application FR2,829,869 describe a kind of electric switch equipment, comprise movable contact conductive arm, contact pressure spring and be used for improving by the contact pressure spring be applied on the described arm power or according to the magnetic device that minimizes this power in described arm value of current flowing.

A shortcoming of a kind of electric switch equipment like this is that magnetic device comprises two magnetic circuits, and one of them is movable, so they implement complicated.

Summary of the invention

The objective of the invention is by proposing the shortcoming that a kind of switching device remedies the switching device of prior art, this switching device comprises:

Movable main contact, it is supported by contact arm and cooperates with static main contact in make position;

Tripping mechanism, it acts on the described contact arm;

Manual reseting device, it acts on the described contact arm via described tripping mechanism and can occupy the position and the position of representing described device to thread off of the setting of the described device of representative;

Trip gear, it acts on the described contact arm via described tripping mechanism; And

Be used to indicate the mechanism of the melting welding of described main contact, it acts on the described manual reseting device so that described manual reseting device occupies the centre position to show the melting welding that has described main contact.

It is characterized in that of described device, described indicating mechanism comprises locking-bar, this locking-bar is provided with the movable part that acts on the described contact arm when described main contact is closed described locking-bar is positioned at the snap close position, described locking-bar is provided with lock catch arm, this lock catch arm has hook, and this hook is arranged as so that after described device is threaded off manual reseting device is fixed on described centre position when described locking-bar is in described snap close position.

Described tripping mechanism preferably acts on the movable main contact via the control actuator with electromagnet, and this activity main contact is by the movable part coupling of contact holder and described control actuator.

The movable part of snap close joystick is preferably by contact holder and contact arm coupling.

According to an embodiment, the movable part of locking-bar is second arm.Contact holder is in fact preferably formed by anchor clamps, and second knee-joint of contact arm and locking-bar is combined in these anchor clamps.Second arm of locking-bar preferably includes when main contact is closed by the portion that only stops on the piece of only stopping that is pressed in contact holder.

According to an embodiment, manual reseting device comprises the hanging locking device that is used for cooperating with the padlock annex with the described switching device of snap close, and described hanging locking device is can not be approaching when described manual reseting device mediates.Hanging locking device preferably includes the opening of the hasp that is used to receive padlock.

According to a feature, switching device comprises: by the movable contact arm that electric conducting material is made, its support activity main contact is to open or closed described movable main contact; The contact pressure spring, it acts on the described contact arm to apply contact pressure between described movable main contact and static main contact; And the magnetic with opening of U-shaped profile is strengthened the loop, it is associated with described contact arm, described magnetic is strengthened the loop and is formed by ferromagnetic material, and be arranged as so that at least a portion in the length of described contact arm covers this contact arm when described movable main contact is closed, so that described contact pressure is strengthened when short-circuit current flows in described contact arm, this switching device is characterised in that, described magnetic is strengthened the loop and is fixedly mounted in the described switching device about described static main contact, and it is arranged as with respect to described contact arm so that described contact arm is strengthened the predetermined overshoot distance of loop overshoot from magnetic when described movable main contact is closed.

According to another feature, the overshoot range averaging gets up to be the 0.1-2 millimeter on the described length part of the contact arm of being strengthened the loop covering by magnetic.

According to another feature, the overshoot range averaging gets up between 0.5 and 1 millimeter on the length part of the contact arm of being strengthened the loop covering by magnetic.

According to another feature, magnetic is strengthened the loop and is had the yardstick between 20 and 35 millimeters of being included in that is being parallel to that the contact arm length direction limits.

According to another feature, magnetic is strengthened the loop and is had what the direction perpendicular to the length of contact arm limited and be included in yardstick between 4 and 7 millimeters.

According to another feature, contact arm is formed by blade, and this blade is arranged as so that two branches of the U that its two maximum surperficial profiles of facing the magnetic reinforcement loop that is associated with described contact arm basically form.

According to another feature, the overshoot distance is formed on the wearing clearance of contact pads wherein more than or equal to main contact.

According to another feature, magnetic strengthen the loop directly with contact arm that it is associated on interact, to strengthen the contact pressure when short-circuit current is mobile in described contact arm.

Description of drawings

Other advantage and feature will only provide with the purpose of indefiniteness example and the description of specific embodiment illustrated in the accompanying drawings and become clearer of the present invention from following.

Figure 1A and 1B are the perspective views according to switching device of the present invention.

Fig. 2 is the explanatory view that the critical piece of switching device is shown.

Fig. 3 A and 3B are the perspective views of heat and magnetic trip gear.

Fig. 4 is the perspective view that is illustrated in control actuator, tripping mechanism and trip gear in the housing especially.

Fig. 5 is the cross sectional view according to switching device of the present invention.

Fig. 6 A and 6B are the perspective views that trip gear, tripping mechanism and control actuator are shown.

Fig. 7 A and 7B are the perspective views that the part of reset button and tripping mechanism is shown.

Fig. 8 is the fragmentary, perspective view of actuating unit.

Fig. 9 A and 9B illustrate the electric control circuit according to the control actuator of different embodiment.

Figure 10 A, 10B and 10C are the perspective views that comprises the actuating unit of control actuator and base portion thereof.

Figure 11 A and 11B are schematically illustrated to strengthen the loop in the contact arm of the open position of the make position of main contact and main contact and the magnetic that is associated with contact arm respectively.

Figure 12 is illustrated in and does not have contact arm to strengthen with respect to described magnetic under two kinds of situations of overshoot (overshoot) in loop strengthening the powerful variation of opening distance with respect to the main contact on X-axis that adds that the loop applies by magnetic on the Y-axis.

Figure 13 A, 13B and 13C are the perspective views that the switching device of (set), dropout and snap close is set in main contact welding back.

Figure 14 illustrates the power distribution equipment according to switching device of the present invention that comprises the feedline circuit load-side that is placed in current limiting device.

Embodiment

With reference to Figure 1A and 1B, switching device 1 is contained in the housing, and this housing is provided with two flange plates 11 and 12, and these two flange plates 11 and 12 support the main panel 14,15 of described device.Can be with these two flange plates respectively as housing and lid.Main panel 14,15 is parallel to each other basically.Switching device 1 comprises the rear portion that is provided with device 17A and 17B, and this device 17A and 17B are used for fixing described switching device on the supporting rail of electrical panel.Such several electric switchgears can be previous and side by side stationary device 17A and 17B are fixed to the identical support portion of identical panel via their main panel 14,15 by a back adjacency by being used for these several electric switchgears.

In the embodiment shown, the range normalization between the main panel 14,15, and be substantially equal to number of electrodes and multiply by 9 millimeters standardized electrode distance, just, the distance between the panel 14,15 is substantially equal to or is slightly less than 18 millimeters.Such switching device has standardized profile, and it makes them can be fixed to the support portion with identical standard.Thereby standardization distance and profile give switching device 1 module attribute.

As can finding out from Figure 1A, 1B and 2, switching device 1 comprises and is provided with the connection panel 21,22,23 of permission near the opening 25,26,27,28 of splicing ear.Switching device 1 is two electrodes, and comprises the phase input terminal 31 and the phase output terminals 32 of power or circuitry phase, and the neutral input end of neutral circuit 34 and neutral lead-out terminal 35. Terminal 31,32 is contained in opening 25,26 back respectively, and terminal 34,35 is contained in opening 27,28 back respectively.Make it possible to arrive connection panel 21,22, away from device near the outside opening of opening 25-28 of these terminals.This device also is provided with two control terminals 37,38, and this control terminal 37,38 can be approaching to the opening 29,30 that connects on the panel 23 via outside opening.Circuitry phase separates by different central divider 39 with neutral circuit, and described central divider 39 is independent of two flange plates 11,12 of housing and is fixedly mounted on the described flange plate.As finding out from Figure 1A and 1B, switching device 1 also comprises the anterior part that is equipped with reset button 40.Switching device also comprises the second manual trip push button 42.When switching device was installed in the electrical panel, the user can be near these two buttons 40 and 42.In other embodiment that does not illustrate, these two buttons can be substituted by handle, and this handle makes the user to carry out simultaneously to reset and the hand tripping function.To show whether switching device is set up, in this case, if the indicator for displaying red color is perhaps switching device dropout, the green color of indicator for displaying in this case by reset button 40 for indicating device 44.

With reference to Fig. 2, the circuitry phase of switching device 1 extends between phase input terminal 31 and phase output terminals 32.The neutral circuit that is used for this part extends between neutral input end 34 of neutral circuit and neutral lead-out terminal 35.Circuitry phase comprises the trip gear 41 that is electrically connected to phase input terminal 31 and illustrates in greater detail in Fig. 3.In other embodiments, trip gear can be electrically connected to phase output terminals 32.These trip gears comprise thermal release device 43 and the magnetic trip gear 45 that is connected in series on the circuitry phase.These trip gears 41 act on respectively on the movable main contact 47,48 of circuitry phase and neutral circuit indirectly.Opening by the dropout chain of these contacts realize, this dropout chain comprises the tripping mechanism 51 of trip free, by the control actuator 53 of rectifying device 55 power supplies with act on second mechanism 57 on the movable contact 47,48.Used free tripping mechanism is meant and can be independent of operating means in the switching device of the prior art, is reset button in this application, and the mechanism that activated.Therefore such mechanism can be threaded off and make main contact open, even under the situation that keeps depressing in reset button.

As can finding out in Fig. 2, tripping mechanism 51 can also be via button 40 and via 42 actions of second button, and described button 40 makes switching device to be reset, and described second button 42 can make the switching device hand tripping.This tripping mechanism 51 cooperates with control actuator 53 via switching device switch inside 59,169.The term internal switch is represented the switching device of any kind, no matter switch motion still is that electronic unit is carried out by mechanical part.Advantageously, internal switch 59,169 comprises movable control contact 59, for example movable contact bridge or the flexible blade of describing in the back.Like this, when carrying out hand tripping when taking place to thread off or by second button when in electric fault, control contact 59 is opened to open movable contact 47,48 indirectly.Resetting of switching device carried out by reset button 40, and the closed control of this reset button contact 59 is with closed movable contact 47,48, and wherein said control contact makes it possible to control by apply suitable voltage between terminal 37 and 38.If do not have voltage between control terminal 37 and 38, movable contact remains on open position.

As can in Fig. 2, finding out, for the input of the rectifying device 55 of control actuator 53 power supplies is connected to unshowned alternating-current voltage source via two control terminals 37,38.In other embodiment that does not illustrate, this power supply of rectifying device 55 can be by directly providing in switching device inside with being connected of neutral circuit with circuitry phase.In this case, switching device will not comprise any control terminal, and the control of described device, especially control the control of actuator 53, will carry out via the communication interface that be associated with the control electronic devices and components that are placed in described device inside.This communication interface can be hard wire or the soft cloth line, for example radio type or nearly magnetic field coupling type.

Switching device as shown in Figure 2 is particularly suitable for being installed in the load-side of current limiting device.Control actuator 53 is placed in the fact in the dropout chain and has been implemented in electric fault in automatic mode for example short circuit or overload the time are opened main contact and switched described main contact by local or remote control command.More accurately, control actuator 53 is placed between movable main contact 47,48 and the trip gear 41 so that after short circuit or overload back or accompany or follow the described movable contact 47,48 of control command and open via this control actuator necessity ground generation.Compare with the switching device of mainly carrying out by free tripping mechanism and the possible striker (striker) that is placed on the magnetic trip gear of wherein threading off, the response time of opening movable main contact 47,48 can be controlled, perhaps even increase.Used free tripping mechanism is meant and can be independent of operating means just reset button and the mechanism that activated in the switching device of prior art.Therefore such mechanism can be threaded off and cause main contact to be opened, even under the situation that keeps depressing in reset button.Control actuator 53 is installed in makes the opening delay and can be able to controlled and/or regulate of movable main contact 47,48 in the dropout chain of switching device.When switching device was placed in the load-side of short-circuit current limiting device, opening of described switching device postpone to make and can wait to the line side restraint device to limit before opening movable main contact 47,48 always, perhaps even elimination, and short circuit current.This causes when short circuit takes place, and wherein the thermal stress and the electronic stress that initiatively participate in by opening early when the high electric current in traditional device of interrupting short circuit of main contact 47,48 is much lower by the thermal stress of main contact 47,48 experience and electronic stress ratio.Therefore, be appreciated that under relevant situation that when short circuit took place, main contact aging was very low owing to open that main contact occurs being delayed with respect to the circuit peak value according to the switching device with line side restraint device of the present invention.Therefore the short-circuit protection function of switching device is simplified.For example, in this switching device, no longer need to force the existence of arc control device.And, do not exist direct link to produce between movable main contact 47,48 and the tripping mechanism 51 and simplify and more flexible dropout chain.Especially, be different from circuit breaker of the prior art, tripping mechanism 51 does not experience fracture strength, and this has reduced the restriction of elasticity, impact strength and heat projection endurance aspect for mechanism components greatly.At last, the actuating of main movable contact only can by the control actuator carry out rather than by one be used for that short circuit disconnects and one be used for the fact that two different mechanisms that rated current switches carry out and make the complexity of device reduce.In fact, no longer need to manage on the one hand between the movable main contact and the complicated mechanical handing-over between tripping mechanism and the control actuator on the other hand.This simplification further makes the performance of handoffs under rated current obviously to improve, and does not influence the relevant disconnection performance that is formed by line side according to the present invention restraint device and load side switch device.

With reference to Fig. 3 A and 3B, thermal release device 43 forms by bimetal strip in fact, just, and the different metal by having the different coefficients of expansion or two blades of alloy.Bimetal strip comprises the free end 61 that is electrically connected to movable contact 47 by conductive braided fabric thing 62 (Fig. 4).The overload current that flows in the bimetal strip 43 causes the heat of this free end 61 to rise and deflection.This deflection of bimetal strip 43 is by arrow 63 expressions.When this overload current was higher than predetermined heat dropout threshold value, this deflection of the free end 61 of bimetal strip came the opening of movable main contact 47,48 of actuation switch device by tripping mechanism 51.The stiff end 65 of bimetal strip 43 is electrically connected to magnetic trip gear 45.Thereby making, the just substantial bonding jumper 43 of thermal release device when the slow relatively electric fault that has moderate strength is for example transshipped, can thread off.

As finding out in Fig. 3 A and 3B, magnetic trip gear 45 comprises around the coil 71 that is placed in the plunger core in the sheath 73, when electric current described plunger core when described coil midstream is moving moves.Trip gear comprises that also ferromagnetic shell 79 is to optimize the magnetic flux that is flowed and produced by the electric current in the coil.One end 75 of coil is welded direct to ferromagnetic shell 79 so that the moving electric current of coil midstream flows equally in the part of described shell.Thereby this end 75 of coil 71 is electrically connected to the stiff end 65 of bimetal strip 43 by means of the part of the ferromagnetic shell 79 of the support portion that is formed for bimetal strip 76.In particularly advantageous mode, the support portion of bimetal strip 76 becomes the single integral part of being made by ferromagnetic material with hull shape.Two functions are advantageously realized in the bimetal strip support portion, and just, function that the restriction of bimetal strip 43 is supported and elimination are by the function of the magnetic flux of coil 71 generations.Advantageously, therefore bimetal strip 43, bimetal strip support portion and coil 71 directly are connected in series in the current circuit.

The other end 77 of coil 71 is connected to phase input terminal 31 (Fig. 4).Plunger core is placed in its sheath 73 with in the translational motion between (rest) position and the extended position of not working.Plunger core is passed through ferromagnetic shell 79 via opening 81 on a side.One end of plunger core comprises that the snap close ring 83 that cooperates with tripping mechanism is to control opening of contact 59 actuating activity main contacts 47,48 by activity when the electric current that flows in the coil 71 surpasses magnetic dropout threshold value.When the circuit in the coil 71 was lower than the dropout threshold value, regulating spring 85 made plunger core can remain on the inoperative position.This regulating spring 85 is calibrated with as long as electric current is lower than magnetic dropout threshold value and just keeps plunger core in its inoperative position.Regulating spring 85 is acting on the side by only stopping in the portion that the snap close ring 83 on the free end that is placed in plunger core forms, on the edge of the opening 81 that acts on ferromagnetic shell 79 on the opposite side.Magnetic trip gear 45 therefore make exist high-intensity fast or moment electric fault for example surpass 10 times of rated current, can thread off during for example pure short circuit.

More accurately, in the embodiment shown in Fig. 3 A and 3B, the ferromagnetic shell 79 of magnetic trip gear 45 is formed in the folding bonding jumper 86.The first 87 of bar 86 is around coil 71 and make magnetic flux to flow.This first 87 has C shape profile.The second portion 89 of bar 86 is used for by welding the fixedly stiff end of bimetal strip 43.Thereby this second portion 89 of bar makes that not only the stiff end of bimetal strip can be supported, and makes electric current to flow between the coil 61 of described bimetal strip 43 and magnetic trip gear 45.Thereby the structure of trip gear is simplified.

Thermal release device 43 comprises that adjustment screw 88 is used to regulate the heat dropout threshold value of bimetal strip.In particularly advantageous mode, this adjustment screw is directly installed on the folding bonding jumper 86 so that it is clamped by the elbow 90 of folding bonding jumper 86 towards stiff end 65 formation of bimetal strip when tightening.In this way, screw tighten towards or move the free end of bimetal strip away from tripping mechanism.Directly on heat dropout sub-component and the housing assembling adjustment screw 88 that is independent of switchgear device be particularly advantageous because it has improved degree of regulation and drift is regulated in restriction in real time.

In the embodiment shown in Fig. 3 A and 3B, trip gear comprises thermal release device 43 and magnetic trip gear 45, forms single independent sub-component, and this sub-component can be assembled in the switching device as commercial unit independently.In other words, thermal release device 43 and magnetic trip gear 45 form the same trip unit of switching device.This configuration of sub-component or detachable trip unit form helps the assembling of switching device.

As can be as can be seen from Figure 4, thermal release device 43 and magnetic trip gear 45 be placed in the housing side by side in being roughly parallel to the same level that is connected panel 21-23.In other words, thermal release device 43 and magnetic trip gear 45 are placed in the housing so that there is at least one plane, and this plane parallel is in connecting panel 21-23, thus cutting thermal release device 43 and magnetic trip gear 45 the two.

More accurately, as finding out in Fig. 3 A, 3B and 4, the stiff end 65 of bimetal strip 43 is fixed to the stiff end of coil 71 by the second portion 89 of the bar of the ferromagnetic shell 79 of formation magnetic trip gear 45.The part of the free end 61 of bimetal strip 43 is placed between the two ends 75,77 of coil 71 of magnetic trip gear.In other words, extend between two plane P 1 of the connection panel 21-23 of bimetal strip in the restrictions that is parallel to the magnetic trip gear, the P2.And the deflection of bimetal strip 43 occurs in the plane that is parallel to the plunger core motion and is being approximately perpendicular to the travel direction of plunger core.By this arrangement, the volume that is occupied by the trip gear 41 in the plane of the main panel 14,15 that is parallel to switching device is restricted.This configuration of trip gear 43,45 obviously reduces the space that trip gear occupies in the housing.This arrangement makes trip gear 43,45, tripping mechanism 51 and control actuator 53 can be positioned in the identical plane of the main panel 14,15 that is roughly parallel to switching device equally.Thereby be restricted at the volume perpendicular to the switching device in the plane of main panel 14,15, it makes between the described main panel that must note can guarantee 18 mm distance.The deflection that should be noted that bimetal strip 43 also occurs in the plane that is parallel to main panel 14,15 and in the direction of the direction of motion of the plunger core 73 that is approximately perpendicular to magnetic trip gear 45.

This compact Layout mode of trip gear 41 becomes possibility by the translation of direction of actuation that the tripping mechanism 51 that is associated with described trip gear mainly act as at the described tripping mechanism 51 of the direction of actuation that is roughly parallel to the control actuator.Tripping mechanism 51 therefore can be by control actuator 53 location to act directly on the internal switch that comprises movable control contact 59 and static control contact 169, shown in Fig. 9 A and 9B, wherein movable control contact 59 can be closed, and described static control contact 169 is supported by the base portion 159 of described control actuator.

Advantageously, tripping mechanism 51, trip gear 41 and control actuator 53 are installed on the central divider 39, and separating part 39 physically separates circuitry phase and constitute from neutral circuit the removable unit of the flange plate 11,12 that is independent of housing.This makes that the assembling of product is easy especially, in case because tripping mechanism 51, trip gear 41 and control actuator 53 have been installed on the central divider 39, two flange plates 11,12 of housing only need on each side of described separating part closed again.

With reference to Fig. 6 A and 6B, tripping mechanism 51 is included in the snap close 101 that acts on the contact stem 103 between trip gear 41 and internal switch 59,169.According to first alternate embodiment shown in Fig. 6 A and 6B, contact stem 103 support activities control contact 59.Snap close 101 be installed as around be placed in central divider 39 in the pivotal pin that cooperates of housing 104 rotate, and comprise first actuator arm 105, this actuator arm 105 drives by the deflection of bimetal strip 43.Snap close 101 comprises second actuator arm 107, and this second actuator arm 107 is driven by magnetic trip gear 45 concerning this part.Second actuator arm 107 perhaps drives by the bar that is firmly adhered to described button more precisely also by hand tripping button 42.The free end of second actuator arm comprises side bolt 109, and it is inserted in the snap close ring 83 of plunger core of magnetic trip gear 45.According to another unshowned alternate embodiment, bar can be directly by on the snap close ring 83 that is pressed in plunger core, and is that the snap close ring of plunger core drives second actuator arm by the side bolt then.Snap close 101 also comprises and is used for snap close contact stem 103 and keeps contact stem 103 at snap close or the hook 111 of position is set, at described snap close or movable control contact 59 and main contact 47,48 closures in the position are set.Be placed in maintenance spring 113 between second actuator arm 107 and the housing and snap close 101 remained on its snap close position.

Contact stem 103 is installed as for this part around pivotal pin 115 rotations that realized by bolt 126, and described bolt is installed as in the groove of unshowned housing and slides.In the embodiment shown, contact stem 103 is rack forms.On the side about pivotal pin 115, contact stem 103 comprises lock catch arm 117, is used for hook 111 lockings with snap close 101 to keep described bar by snap close or setting.On the opposite side about pivotal pin 115, contact stem 103 comprises actuating arm 119, and movable control contact 59 is placed on this actuating arm 119.According to unshowned another alternate embodiment, movable control contact 59 is formed by the elastic blade of the flexibility that comprises the fixed arm on the base portion that is installed in the control actuator, and the position is set and actuating arm 119 free end of this flexible resilient blade when being pressed on the flexible resilient blade closes on the static control contact 169 when tripping mechanism is in.When contact stem 103 locked or when being provided with by snap close 101, internal switch 59,169 closures.

As finding out in Fig. 7 A and 7B, tripping mechanism 51 further is included in the drive rod 121 that the one end is firmly adhered to reset button 40.This drive rod 121 makes contact stem 103 translation to drive between tip position and bottom position by pushing reset button 40 or discharging described button.Therefore drive rod 121 is installed as on the sliding part of unshowned housing and slides.More accurately, drive rod 121 is firmly adhered to buttonhole 133 at its other end, and its snap close function will further be described.The side direction part of this buttonhole 133 is engaged in the sliding part 108 that slides in the same grooves of housing wherein at the bolt 126 of contact stem 103.Drive rod 121 comprises on the top section that is placed in sliding part 108 and in order to push the portion that only stops 129 on the piece 127 of only stopping of contact stem 103.Back-moving spring 131 shown in Fig. 6 A and 6B is placed between the fixing point (Fig. 4) and reset button 40 of housing, to promote drive rod 121 when contact stem 103 releases and to be firmly adhered to the described button of described bar to tip position.When contact stem 103 was passed through snap close 101 snap closes, back-moving spring 131 also promoted drive rod 121 to tip position, thereby made contact stem 103 turn to the make position of control contact 59.In one situation of back, what contact stem 103 was pressed in the portion that only stops 129 on the sliding part 108 of drive rod 121 of being placed in only stops piece 127, and it makes described bar can turn to its snap close position, is in its make position at this snap close position movable control contact 59.Thereby movable control contact 59 is obtained by the pressure on the lock catch arm 117 that is applied to contact stem 103 by snap close 101 and by be applied to the counter-pressure of only stopping the portion that only stops 129 on the piece 127 by spring 131 to the rotation of its make position.The buttonhole 133 of Miao Shuing is fixed to the end of drive rod 121 by lock catch part 125 in front.This lock catch part 125 not only pin buttonhole 133 arrives drive rod 121, and locking is firmly adhered to the bolt 110 of the actuating arm 119 of contact stem 103.Bolt 110 is arranged as so that can be by lock catch part 125 lockings when contact stem 103 forwards its unlocked position to.The inclined-plane 112 that is firmly adhered to housing cooperates with the top section of contact stem 103 so that described bar forwards its unlocked position to when reset button 40 and the drive rod 121 that is firmly adhered to described button are positioned at tip position.By by being pressed on the reset button 40, therefore contact stem 103 and the control contact 59 that is firmly adhered to this contact stem are driven to bottom position, thereby keep forwarding to the described contact stem of its unlocked position.When contact stem 103 and drive rod 121 were in bottom position, lock catch arm 117 had moved through the hook 111 of snap close 101.After button 40 had discharged, contact stem 103 was driven into tip position up to lock catch arm 117 locking hooks 111 by back-moving spring 131.This bolt 110 that causes being firmly adhered to contact stem 103 moves the position that is positioned at the centre position up to it from lock catch part 125 disengagings and drive rod 121, in described centre position, what contact stem 103 was pressed in the portion that only stops 129 on the sliding part 108 of being placed in only stops piece 127.

Above-described tripping mechanism 51 is operated in the following manner.When taking place to thread off along with electricity overload, instant heating is threaded off, and the free end 61 of bimetal strip 43 rotates to drive snap close 101 by the power that is pressed on first actuator arm 105 and offset spring 113.In an identical manner, when threading off along with short circuit, promptly magnetic is threaded off, and the plunger core of magnetic trip gear 45 is offset spring 113 by snap close ring 83 and bolt 109 power moves second actuator arm 107 to drive snap close 101 rotations.Again in the same manner, by pushing on hand tripping button 42, second actuator arm 107 moves by bar, thereby the power of offsetting spring 113 is rotated to drive snap close 101.In three kinds of all situations, the rotating drive hook 111 of snap close 101 is to the position that discharges contact stem 103.This causes contact stem 103 to turn to unlocked position, moves to its open position thereby cause controlling contact 59.Simultaneously, contact stem 103 moves to its tip position by drive rod 121 and back-moving spring 131 translations.When having been isolated by opening of main contact 47,48 for the electric fault of dropout cause, plunger core or bimetal strip and snap close 101 are returned to their initial position.This initial position makes contact stem 103 to reset the back by snap close in contact stem 103.Reset is to move to bottom position and carried out to drive contact stem 103 by pushing reset button 40.When resetting beginning, the inclined-plane 112 that is firmly adhered to housing makes contact stem 103 can remain on its unlocked position.In this obliquity of contact stem 103, the bolt 110 of actuating arm 119 can be by by being pressed on the reset button 40 by lock catch part 125 lockings that are firmly adhered to drive rod 121.By pushing reset button 40, contact stem 103 and be firmly adhered to described contact stem and therefore be driven to bottom position.After button 40 had been released, contact stem 103 was driven to tip position by back-moving spring 131 and is latched on the hook 111 of snap close 101 up to lock catch arm 117.Contact stem 103 is then owing to by hook 111 with only stop portion 129 and be applied to the position that power on the contact stem 103 turns to closed movable control contact 59.

As finding out in Fig. 7 A, according to previously described first alternate embodiment, movable control contact 59 is the forms with the contact bridge that is installed in two contact pads 141 on the spring blade 143.Between two contact pads 141, contact stem 103 comprises by the portion that only stops 145 on the piece of only stopping that is pressed in control actuator 53, and is as described below.

With reference to Fig. 8, control actuator 53 is electromagnets, the coil 153 that roughly comprise ferromagnetic shell 151, twines around the coil support portion of being made by insulating material 155 and in the plunger core 157 of described coil support portion slides within.Ferromagnetic shell 151 is formed by two folding bars 158, and each bar has two branches and has the U-shaped profile.When carrying out the installation of control actuator 53, on the major part of the width at them terminal fixed to one another of two branches of the bar 158 that each is folding with the assurance magnetic flux flows.More accurately, the end of Zhe Die bar 158 is bonded in the base portion 159 and the sheath in the coil support portion 155 160,162 that is formed at the control actuator.Actuator 53 and its base portion 159 form thus and can be attached to the removable actuating unit that switching device is assembled separately before particularly on the central divider 39.Thisly be mounted with the assembling that is beneficial to switching device.Plunger core 157 comprises in order to extension that drives movable main contact 47,48 or bar 161.When exciting current flowed in coil 153, plunger core 157 and bar 161 extended to keep movable main contact 47,48 in make position.In the situation that does not have electric current to flow in coil 153, plunger core 157 and bar 161 withdrawals are to keep movable main contact 47,48 at open position.Therefore control actuator 53 is the monostable type, and just it only comprises a settling position when it no longer is supplied electric power.This settling position of actuator is corresponding to the open position of main contact 47,48, and it guarantees safety operation.Under the situation of the power cut-off on the control actuator 53, control actuator 53 spontaneously turns back to its stable open position.

With reference to Fig. 9 A and 9B, the control circuit of control actuator 53, label is 164,166 respectively, comprises two Alternating Current Power Supply terminals 163. Visible control terminal 37,38 in these terminal corresponding diagram 2.In an illustrated embodiment, control actuator 53 is by the external power source that is connected to power supply terminal 163 by remote control switch 165.In unshowned other embodiment, power supply can be by being connected acquisition with the circuitry phase of switching device inside and neutral circuit in housing, and in this case, switching device will comprise communication interface, but not power supply terminal 163.

Further comprising rectifying device 167 at the control circuit shown in Fig. 9 A and the 9B 164,166, is diode bridge in this case, and it is connected to power supply terminal 163.Rectifying device makes the voltage after the alternating voltage on the power supply terminal 163 can be converted to rectification.In unshowned other embodiment, rectifying device can be placed in the switching device outside, if perhaps control voltage be direct current or unidirectional attribute could not have rectifying device.

Further be included in previously described movable control contact 59 and static control contact 169 at the control circuit shown in Fig. 9 A and the 9B 164,166, movable control contact 59 can close on this static control contact 169.Coil 153 is connected to static control contact 169, and comprises that first pours in the coil 171 and second hold-in winding 173.First pour in coil 171 be used for plunger core 157 it retracted position and its extended position between move.Second hold-in winding 173 is used to keep the extended position of plunger core 157 at it for this part, in described extended position main contact closure.Control circuit comprises that equally movable stroke stops contact 175, and it makes the heating of coil windings be restricted by reducing to consume energy when movable main contact remains closed.Static stroke termination contact 177 away from control circuit 164,166 when more accurately, visible movable stroke stops contact 175 and drives the position of extending fully with the closure that is in corresponding main contact when plunger core by bar 161 in Fig. 8 moves.Stroke stops contact 177 and be placed in the exciting current that flows when movable stroke termination contact 175 is opened with restriction in the control circuit 164,166 in coil 171,173 one or both of.

First pours in coil 171 has the yardstick littler than second hold-in winding 173, and has littler impedance.Second hold-in winding 173 is fit to can store maintenance activity main contact 47,48 closed required electric power this part its yardstick.Second hold-in winding 173 has high resistance with in order to remain closed the minimization exciting current at main contact and to limit power consumption.This exciting current for the electric arc that when generation activity control contact 59 is opened after threading off in hand tripping or when electric fault is arranged, produces enough a little less than and be low-energy.This helps and promotes the Lock-out of electric current, thereby minimizes the damage of movable contact 59 and aging.

In the embodiment of Fig. 9 A, first pours in coil 171 and second hold-in winding 173 is connected in series, and stroke stops contact 175,177 and the 173 parallel installations of second hold-in winding.When plunger core 157 was in its extended position of corresponding main contact closure, stroke stopped that contact 175,177 is opened and exciting current flows through two coils 171,173.Therefore this exciting current is subjected to having the restriction of second hold-in winding of high impedance.

In the embodiment of Fig. 9 B, first pours in coil 171 and second hold-in winding 173 is parallel is connected, and stroke termination contact 175,177 and first pours in coil 171 and is connected in series.When plunger core 157 was in its extended position of corresponding main contact closure, stroke stopped contact 175,177 and opens, and exciting current only flows through second hold-in winding 173.Therefore this exciting current is subjected to having the restriction of second hold-in winding 173 of high impedance.

As finding out in Figure 10 A, 10B and 10C, static control contact 169 is positioned on the base portion 159.Static or rather control contact 169 has two blades or voltage contact area 181,183, in normal running, is not just having under the electric fault in tripping mechanism is provided with, and the pad 141 of movable control contact 59 is pressed on this blade or the voltage contact area.Only stop piece 184 and be placed between two contact blades 181,183, this two contact blades 181,183 are pressed in the portion that only stops 145 of the contact stem 103 of support activity control contact 59.In second alternate embodiment of unshowned movable control contact 59, just in the flexible resilient blade, static control contact has single voltage contact area, and the pad that is installed in the activity control contact on the flexible blade is pressed against on this single voltage contact area.Static stroke stops contact 177 and is positioned at equally on the base portion 159 concerning this part.As for regard to movable stroke stops contact 175, this contact 175 and plunger core 157 couplings.Wherein movable control contact 59 and stroke stop contact 175,177 and are placed in the assembling that this structure on the actuating unit helps switching device.In the embodiment shown, rectifying device 167 equally directly is placed on the base portion 159 of actuating unit.Thereby even further help the assembling of switching device.

The control actuator 53 of Miao Shuing is operated in the following manner in the above.The open and close of movable main contact 47,48 is controlled via the remote control switch outside switching device 165.When remote control switch 165 was closed, control actuator 53 was supplied to electric power and movable main contact 47,48 remains closed by plunger core 157 and the bar 161 that is in extended position.When remote control switch 165 was opened, actuator no longer was powered and movable main contact 47,48 stays open by plunger core 157 and the bar 161 that is in retracted position.In one situation of back, remote control switch 165 is positioned at the line side of rectifying device 167, the electric current that in coil, flows when via rectifying device 167 by the time not elimination immediately but reduce gradually.The low-down power consumption of actuator makes electric current to reduce gradually.Only when electric current reached decline (drop-out) current value, plunger core 157 just moved to retracted position.The number of turn of considering hold-in winding is very many, and the level of drop-out current is very low.This advantageously gives device to the short time better bearing strength of the outage of a few tens of milliseconds just that cuts off the power supply, and does not need for example any other power supply source of capacity type.Like this, under the situation that the line side of rectifying device 157 short time voltage falls, control actuator 53 does not move to its settling position immediately, but remains on make position, thereby guarantees that main contact remains on make position.

In switching device is placed in situation in the load-side feedline circuit of current limiting device, it can be that load-side short circuit by another switching device causes that the control circuit of control actuator 53 provides good bearing strength to about tens of milliseconds short supply interruption, described short supply interruption.Therefore this short supply interruption bearing strength makes the service continuity on feeder line improve, and does not worry losing efficacy.Opening by activity control contact 59 of movable main contact 47,48 realized after the electric fault or the described main contact closure in back that resetting.Movable control contact 59 is placed in the load-side of rectifying device 167, and main contact 47,48 opens and open described contact by remote control switch 165 and compare quicker after electric fault.Take place between effectively the opening of the moment and main contact in fault, the time of opening of main contact for example is included between the 6-15 millisecond then less than 20 milliseconds.This operator scheme for fault is used to guarantee that main contact enough opens fast, is used to weaken short circuit current, and typically less than 30 times of rated current, for this reason, the line side restraint device is not initiatively for it, and switching device outage electric current on one's own account.

As finding out in Figure 4 and 5, movable main contact 47,48 is placed in respectively on two movable contact arms 203,204, and described movable contact arm 203,204 is installed as the pivotal pin 201 that centers on first end of described arm and rotates.Contact arm the 203, the 204th has the form of a blade of two first type surfaces that are installed as the main panel 14,15 that is roughly parallel to housing.Movable main contact 47,48 is fixed on the edge or thickness of contact arm 203,204, and on its principal dimensions, towards second end of described contact arm.Contact arm 203,204 is coupled to the bar 161 of plunger core 157 by anchor clamps or contact support portion 205, and described knee-joint is combined in described anchor clamps or the contact support portion 205.Anchor clamps 205 self are firmly adhered to the end of bar 161.The contact pressure spring 208 that acts on each contact arm 203,204 makes enough pressure can remain between movable main contact 47,48 and their the corresponding static main contacts 206,207.More accurately, this contact pressure spring 208 is placed between the end of the element of anchor clamps 205 and support activity main contact 47,48 contact arm 203,204.When plunger core 157 was extended, therefore contact pressure spring 208 made pressure can remain between the main contact 47,48,206,207.

In the embodiment shown in Figure 4 and 5, when electric fault, thread off the back or opening or close commands after, the motion of movable main contact 47,48 is that its plunger core 157 travel directions take place via identical control actuator 53 and in roughly identical with the direction of actuation of described actuator direction.And this direction of actuation is extended perpendicular to the front panel of switching device and in the direction that is parallel to tripping mechanism 51, this means that the compactedness of switching device improves.

In the embodiment shown in Figure 4 and 5, tripping mechanism 51 is in the translation direction operation of the direction of actuation that is roughly parallel to control actuator 53.In other words, the direction of motion of the contact stem 103 of drive rod 121 and tripping mechanism 51 is roughly parallel to the direction of motion of the plunger core 157 of control actuator 53.

Movable contact arm the 203, the 204th is made by electric conducting material.The magnetic reinforcement loop 210,211 that directly cooperates with each movable contact arm 203,204 makes the pressure between the main contact 47,48,206,207 strengthen, particularly when the electric current that flows in the movable contact arm 203,204 during apparently higher than the rated current of device, for example than magnetic dropout threshold value height, even high a lot, when for example high tens times short circuit current flows.More accurately, each magnetic is strengthened loop 210,211 and is roughly had the element of being made by the ferromagnetic material with U-shaped cross section (Fig. 5), and described element is installed as securely attached in the housing and partly around each contact arm 203,204.In particularly advantageous mode, open in magnetic reinforcement loop, just, bears the effective air gap that adds brute force and form by the airborne distance between two branches of U.Especially, this is different from the magnetic loop that is called the closed-loop path, and to this, another closed magnetic circuit of ferromagnetic part that is generally activity is to reduce air gap.Contact arm 203,204 advantageously by nonferromagnetic material for example copper or brass make, when mobile, not change effective air gap.Magnetic is strengthened loop 210,211 and is therefore fixed about static main contact 206,207.Each contact arm 203,204 comprise be roughly parallel to magnetic strengthen loop 210,211 the U-shaped section branch the surface or be parallel to two side surfaces that described magnetic is strengthened the edge in loop so that described magnetic strengthen the magnetic flux that flows in the U-shaped section in loop 210,211 via its side surface by described contact arm.The magnetic force maximization that the air gap that the movable contact arm makes magnetic strengthen the loop about (on-the-edge) arrangement form on this edge of U-shaped section minimizes and produces.

In the illustrated embodiment, movable contact arm 203,204 is installed as and can rotates.In other unshowned embodiment, the movable contact arm can move in translation.

Magnetic strengthen loop 210,211 preferably by comprise iron and silicon for example the alloy of 2% silicon make.Such component make at least when for example the being short-circuited electric current in contact arm 203,204 have the rising front of precipitous gradient the time obtain contact pressure and strengthen faster.

When electric current flowed in one of contact arm 203,204, the magnetic contact pressure was strengthened flux and is produced, and it strengthens flowing in the loop 210,211 and by described contact arm at magnetic.This magnetic flux is tending towards attracting contact arm 203,204 downwards and the movable main contact 47,48 of described contact arm is pressed on the static main contact 206,207.Magnetic is strengthened loop 210,211 thereby is minimized in the risk that forms electric arc between movable main contact 47,48 and the fixed contact separately 206,207, and electric arc generally can be observed after the repulsion at contact on traditional unit.Thereby the erosion of main contact minimizes widely.And the risk of main contact welding reduces greatly.

In switching device according to the present invention therein and the situation that the line side current limiting device is associated, magnetic is strengthened loop 210,211 and is had the function that keeps the main contact closure in the whole process by line side restraint device restriction electric current equally.Like this, guarantee main contact only since the cause fault current of current limiting device reduce greatly, perhaps even just open when eliminating.Switching device according to the present invention has two kinds of different manifestations, and it depends on that short circuit is still weak by force to moderate strength.For strong short circuit, 30 times of rated current that just surpass the load side switch device, for example about 90 times rated current, line side current limiting device are carried out the restriction of fault current so that just show as Closing Switch as long as electric current surpasses predetermined threshold load side switch device.In this case, magnetic reinforcement loop must guarantee that main contact remains on make position.For weak situation to medium short circuit, just less than 30 times of the rated current of load side switch device, for example the 10-30 of the rated current of load side switch device times, the interruption of line side current limiting device and inoperation and fault must be carried out alone by the load side switch device.In this case, add brute force and needn't prevent that main contact from opening by what magnetic strengthened that the loop produces.Therefore, must find a kind of trading off in ability that switching device under the strong short circuit condition remains closed with between the weak ability that switching device is opened easily under the medium situation of short circuit.Should be compromise strengthening loop 210,211 by each magnetic obtains about the specific arrangements mode as described below of the movable contact arm 203,204 that is associated with it.

With reference to Figure 12, have been found that when strong short circuit current flows in contact arm by magnetic adding of strengthening that the loop applies and powerful 301 be tending towards contact arm therein and extend between the position 302 of strengthening the loop just over described magnetic in the position of the contact arm that covers by accentuator fully at least a portion of its length and wherein said contact arm and increase.Surpass wherein contact back one described position of overshoot a little, this adds powerful 301 and is tending towards reducing.Being applied to contact arm therefore is not optimum with this value that adds brute force 301 that keeps the contact arm closure.,, just be tending towards slowly reducing under the situation of medium short circuit current weak by the such magnetic reinforcement brute force 303 that adds that the loop applied that when contact arm is closed, at least a portion of the length of contact arm, covers described arm fully as long as described contact arm opens.Add powerful this and slowly reduce to be tending towards slowing down opening of main contact.

Have been found that, by strengthening loop 210,211 so that described contact arm overshoot accentuator is scheduled to the overshoot distance when movable main contact is closed about described contact arm 203,204 arrangement magnetic, the brute force that adds that is applied on the described contact arm is optimized to keeping the main contact closure during the high-intensity short circuit and open described main contact more quickly during low intensive short circuit.As can in Figure 12, finding out, because the such arrangement of magnetic circuit, particularly for overshoot, add powerful 305 and maximize in high strength short circuit process, to keep main contact closed and in low-intensity short circuit process, add powerful 307 and reduce quickly to open main contact quickly owing to overshoot.Curve 301,303 correspondences add powerful with respect in the variation that does not have the open position of main contact under the situation of overshoot.

With reference to Figure 11 A and 11B, each magnetic reinforcement loop 210,211 is arranged as about the contact arm 203,204 that is associated with it so that when movable main contact is closed (Figure 11 A), the overshoot distance 221 that described contact arm overshoot accentuator is predetermined.This overshoot distance is on the length part of the contact arm of being strengthened the loop covering by magnetic, on average between the 0.5-1 millimeter.Label shown in Figure 11 A is 221 the overshoot ultimate range not average apart from correspondence.In the embodiment of suggestion, maximum not average overshoot distance greater than or be substantially equal to wearing clearance.For the rated current of 10-40 ampere, this wearing clearance for example equals 1 millimeter between the 0.5-3 millimeter.Contact arm 203,204 and magnetic separately thereof are strengthened loop 210,211 and are operated in the following manner.When contact arm 203,204 is in the make position of contact (Figure 11 A), the base portion that described contact arm is strengthened loop 210,211 about magnetic tilts a little, and the top of described contact arm is about the top overshoot a little of the branch of the U in described magnetic reinforcement loop.This overshoot that contact arm 203,204 is strengthened loop 210,211 about magnetic makes that its maximized the brute force that adds that is applied on the described contact arm when 30 times the electric current that just surpasses the rated current of switching device when strong short circuit current flowed in described contact arm.Under the situation that has such electric current, the restriction of this electric current generally can be carried out by the current limiting device that is connected the line side, and be applied on the contact arm 203,204 to add powerful 305 (Figure 12) maximum basically, it makes the main contact 47,48,206,207 of switching device remain closed.Weak under the situation of medium short circuit current, just under the situation that in contact arm 203,204, flows less than 30 times electric current of the rated current of switching device, be applied on the described contact arm add powerful 307 less.Under the situation that has such electric current, the restriction of this electric current generally can not carried out by the current limiting device that is connected the line side, because this will bring optionally loss, and the powerful quick decline that adds of opening by being applied on the contact arm of main contact 47,48,206,207 is promoted.When main contact 47,48,206,207 began to open, electric arc formed and electric current continues to flow in contact arm 203,204.As finding out in Figure 12, the brute force 307 that adds that is applied on the contact arm 203,204 has overswing ratio not have overshoot to reduce (303) more quickly, and it makes main contact to open and the disappearance of this electric arc can be quickened.

As finding out in Figure 4 and 5 that switching device comprises the shut-off mechanism that resets, its activity when main contact 47,48,206,207 welding the time.As explaining below, this mechanism can also be defined as contact welding indicating mechanism.This welding of contact can be for example by causing by the existence that the electric arc that electric fault produced takes place when the aging and switching device end-of-life of contact pads.The shut-off mechanism that resets comprises locking-bar or bar 231, and described bar is installed as on housing and rotates around pivotal pin 233.The end of the first arm 235 of locking-bar 231 is bonded in the anchor clamps 205, and contact arm 203,204 also is bonded in the anchor clamps 205.Therefore this first arm 235 of locking-bar 231 is directly coupled to main contact, and its feasible shut-off mechanism that resets can directly activate according to the position of these contacts.This first arm 235 of locking-bar 231 comprises the portion that only stops 245, when main contact closure or welding, just the plunger core on being firmly adhered to described anchor clamps 157 is by control actuator 53 or because the welding of main contact when remaining on its extended position, and this only stops portion 245 and is pressed in only stopping on the piece 247 of anchor clamps 205.Back-moving spring 238 is installed in the sweep 239 of locking-bar 231 and is firmly adhered to only the stopping between the portion so that apply reset force to unlocked position on described locking-bar of housing.This reset force also when no longer being supplied to electric power and contact when control actuator 53 and not welding the plunger core of bias voltage control actuator 53 arrive the purpose of its retracted position.At the opposite side about pivotal pin 233, locking-bar 231 is included in the hook 243 on second arm, 244 ends, and described hook 243 is used for being bonded on the buttonhole 133 of the end of drive rod 121.Locking-bar 231 be arranged as so that the joint of this hook 243 in buttonhole 133 occur on the one hand ought be in fact because the welding of main contact, when described locking-bar 231 is maintained at the snap close position of make position of corresponding contact arm 203,204 by the first arm 235 and anchor clamps 205, and on the other hand when drive rod 121 since electric fault is threaded off or hand tripping after when moving to the dropout position.When locking-bar 231 was in the snap close position, the hook 243 of described locking-bar in fact was positioned at the direction of drive rod 121 translations, so that the buttonhole 133 of described drive rod is latched on the described hook when described drive rod moves to its dropout position.The shut-off mechanism that resets further comprise being placed in be arranged in the opening 249 (Figure 13 B) of drive rod 121 about the reset button 40 on the end relatively of buttonhole 133).This opening is used to receive the hasp of padlock to prevent resetting after contact is opened after the electric fault or after deliberately threading off by button 42.Or rather, this opening 249 is placed in the reset button 40 so that be in its dropout position and the snap close 243 of locking-bar 231 when being bonded in the described buttonhole (Figure 13 C) when drive rod, perhaps when switching device is in the close position and does not have the welding of contact (Figure 13 A), the indentation at least in part of this opening is in this case for being fully retracted.Like this, when when normally closed instruction back main contact passes through external contacts 165 welding or normally closed, resetting of switching device can not be by padlock.The shut-off mechanism that resets is operated by following mode.When main contact 47,48,206,207 welding, opening of remote control switch 165 do not make plunger core 157 withdrawals and contact arm 203,204 remain on their make position.Therefore inaccessible extension or closed contact position and the locking-bar 231 snap close position that therefore is in it at it of anchor clamps 205.In the dropout that causes by electric fault or after by the dropout due to pushing on hand tripping button 42, snap close 101 moves to its unlocked position and discharges contact stem 103.This identical contact stem 103 is translational motion under the pressure of the spring 123 of opening contact 59, and the drive rod 121 that its installs place is owing to the pressure of spring 131 translational motion that makes progress.When this motion of drive rod 121 takes place, be latched at the buttonhole on the end of described bar 133 on the hook 243 of locking-bar 231 of the unlocked position that is in it.Therefore the upwards translational motion of drive rod 121 stopped before its mobile end.This reset button 40 that causes being firmly adhered to drive rod 121 is held in place and is in the centre position between the position of being provided with that the dropout position of tip position and wherein said button are in bottom position in wherein said button.This centre position of reset button 40 makes that the welding of main contact is shown.In this way, locking-bar 231 has the function of the welding of indication contact equally.

Reset and cut off or an advantage of contact welding indicating mechanism is, the contact welding detects and the indication chain is gone up in fact by locking-bar 231 and drive rod 121 and formed.Therefore simple mechanism comprises several mechanical parts, and this has improved reliability.

With reference to Figure 13 A, 13B, 13C, the switching device of Jie Shaoing is operated in the following manner in front.

The switching device when being set up just in the normal running is illustrated among Figure 13 A.In normal running, snap close 101 is in the snap close position, and wherein hook 111 fixed contact bars 103 are in the snap close position.In this position of contact stem 103, the contact pads 141 that is placed in the activity control contact 59 on the described bar under the pressure of blade spring 143 by the contact blade 181,183 that is pressed in static control contact 169 on.And the reset button 40 that is firmly adhered to drive rod 121 is in retracted position, and just, the top section of button 40 is in the level identical with the indicating device 44 that shows red color.The closure of movable control contact 59 is given the control circuit power supply of control actuator 53, and the plunger core 157 of described actuator remains on its extended position.The anchor clamps 205 that are firmly adhered to plunger core 157 make contact arm 203,204 can remain on the make position of main contact 47,48,206,207 by bar 161.Contact pressure spring 208 arrives for this part and by being pressed on the contact arm 203,204 to guarantee flowing of rated current.

The device that is in the dropout position is illustrated among Figure 13 B.The dropout of device can be the result of thermoelectric gas fault, magnetoelectricity gas fault or the hand tripping undertaken by hand tripping button 42.In these three kinds of situations, snap close 101 has moved to its unlocked position by trip gear 41 or hand tripping button 42, and contact stem 103 motion of the hook 111 by snap close 101 and release.After its release, the drive rod 121 at place is installed owing to the power that spring 131 applies moves in contact stem 103 and it.Therefore movable control contact 59 is positioned at open position.And the reset button 40 that is firmly adhered to drive rod 121 is in complete off-position and indicating device 44 shows green color, opening 249 be can be approaching and padlock become possibility.Opening of movable control contact 59 no longer makes the control circuit of control actuator 53 to be powered, and the plunger core 157 of described actuator is pushed to its stable retracted position by back-moving spring 238.Contact arm 203,204 is in the open position of main contact 47,48,206,207 owing to the anchor clamps 205 that are firmly adhered to plunger core 157.

When main contact 47,48,206,207 welding, install a state that state is identical that is in then with as shown in FIG. 13A.When the dropout of device produced by fault current or by hand tripping button 42, switching device was in the new state shown in Figure 13 C then.In the releasing process of contact stem 103, described contact stem moves by spring 123, and this spring 123 drive rod 121 mounted thereto is owing to the power that spring 131 applies moves, and movable control contact 59 has moved to open position.This causes no longer supplying the actuation circuit that electric power is given the control actuator.Although actuation circuit is not supplied to electric power, contact arm 203,204 still remains on the make position of main contact 47,48,206,207 and the extended position that anchor clamps 205 remain on it.Thereby locking-bar 231 remains fixed in the snap close position, and the translational motion of drive rod 121 in the moment releasing process stop by buttonhole 133, and wherein said buttonhole 133 snaps into the hook 243 of locking-bar 231.Be firmly adhered to the reset button 40 of drive rod 121 so the centre position between depressing position when switching device is set up and the off-position when switching device is threaded off.This centre position of reset button makes it show that to the user main contact 47,48,206,207 welds and switching device can not be worked.

As finding out in Figure 14, the switching device 1 of Miao Shuing can be used for the load-side feedline circuit of current limiting device 401 in front.Except electric current restriction, device 401 can also be used for opening input circuit very apace under the situation of short circuit current appears in one of feedline circuit.In this way, in described feedline circuit before switching device 1 is opened, input current is restricted equally.

Claims (12)

1. switching device comprises:

Movable main contact (47,48), it is supported by contact arm (203,204) and cooperates in make position and static main contact (206,207),

Tripping mechanism (51), it acts on the described contact arm,

Manual reseting device (40), the position that it acts on the described contact arm via described tripping mechanism and can occupy the position of the setting of representing described switching device and represent the dropout of described switching device,

Trip gear (41), it acts on the described contact arm via described tripping mechanism, and

Be used to indicate the mechanism of the melting welding of described main contact (47,48,206,207), this mechanism acts on the described manual reseting device so that described manual reseting device occupies the centre position showing the melting welding that has described main contact,

It is characterized in that, described indicating mechanism comprises locking-bar (231), this locking-bar is provided with the movable part (235) that acts on the described contact arm when described main contact is closed described locking-bar is positioned at the snap close position, described locking-bar (231) is provided with lock catch arm (244), this lock catch arm has hook (243), described hook is arranged as so that after described switching device is threaded off described manual reseting device (40) is fixed on described centre position when described locking-bar is in the described snap close position, and, the movable part of described locking-bar (244) is second arm, and this second arm of described locking-bar (231) comprises when described main contact is closed by the portion that only stops (245) on the piece (247) of only stopping that is pressed in described contact holder, and be used to indicate the drive rod (121) of mechanism by tripping mechanism (51) of the melting welding of described main contact to act on described manual reseting device, and described manual reseting device (40) is fixedly mounted on the end of described drive rod (121), described drive rod (121) the other end comprise be used for threading off after by the buttonhole (133) of described hook (243) locking of described locking-bar (231), and described tripping mechanism (51) acts on described movable main contact (47 via the control actuator (53) with electromagnet, 48) on, described movable main contact is by movable part (157) coupling of contact holder and described control actuator, described tripping mechanism (51) is via described switching device switch inside (59,169) cooperate with described control actuator (53), described switching device comprises movable control contact (59), described control contact (59) is opened to open described movable contact (47 indirectly when taking place to thread off, 48), resetting of described switching device carried out by manual reseting device, described manual reseting device is reset button (40) and closed described control contact (59), so that can control with the described movable contact of closure (47,48).

2. device as claimed in claim 1 is characterized in that, the described movable part (235) of described locking-bar (231) is by described contact holder and described contact arm (203,204) coupling.

3. device as claimed in claim 1 or 2 is characterized in that, described contact holder is formed by anchor clamps (205) in fact, and described second arm (235) of wherein said locking-bar (231) and described contact arm (203,204) engage.

4. each described device in the claim as described above, it is characterized in that, described manual reseting device (40) comprises the hanging locking device that is used for cooperating with the padlock annex with the described switching device of locking, and this hanging locking device is can not be approaching when described manual reseting device is in described centre position.

5. each described switching device in the claim as described above comprises:

By the movable contact arm (203-204) that electric conducting material is made, its support activity main contact (47,48) to be opening or closed described movable main contact,

Contact pressure spring (208), it acts on the described contact arm applying contact pressure between described movable main contact and static main contact (206,207), and

Opening magnetic with U-shaped profile is strengthened loop (210,211), it is associated with described contact arm, described magnetic is strengthened loop (210,211) form by ferromagnetic material, and be arranged as so that when described movable main contact is closed, at least a portion of the length of described contact arm, cover this contact arm, so that when short-circuit current is mobile in described contact arm, strengthen described contact pressure

It is characterized in that, described magnetic is strengthened the loop about described static main contact (206,207) be securely fixed in the described switching device, and it is arranged as about described contact arm so that described contact arm is strengthened the predetermined overshoot distance (221) of loop overshoot from described magnetic when described movable main contact is closed.

6. device as claimed in claim 5 is characterized in that, at the above overshoot distance (221) average out to 0.1-2 millimeter of described length part of the contact arm of being strengthened the loop covering by described magnetic.

7. device as claimed in claim 6 is characterized in that, at the above overshoot distance (221) average out to 0.5-1 millimeter of described length part of the contact arm of being strengthened the loop covering by described magnetic.

8. as each described device among the claim 5-7, it is characterized in that described magnetic is strengthened the loop and had what the direction that is parallel to described contact arm length limited and be included in yardstick between the 20-35 millimeter.

9. as each described device among the claim 5-8, it is characterized in that described magnetic is strengthened the loop and had what the direction perpendicular to the length of described contact arm limited and be included in yardstick between the 4-7 millimeter.

10. as each described device among the claim 5-9, it is characterized in that, described contact arm (203,204) formed by blade, this blade is arranged as so that two branches of the U-shaped that its two largest face roughly form in the face of the profile of being strengthened the loop by the described magnetic that is associated with described contact arm.

11., it is characterized in that described overshoot distance is greater than or equal to the wearing clearance that described main contact (47,48,206,207) is formed on contact pads wherein as each described device among the claim 5-10.

12., it is characterized in that described magnetic is strengthened loop (210,211) and directly interacted on the described contact arm that is associated with it to strengthen contact pressure when short-circuit current flows in described contact arm as each described device among the claim 5-11.

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