CN109427515B - Air switch with surge protection function - Google Patents
Air switch with surge protection function Download PDFInfo
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- CN109427515B CN109427515B CN201710725036.XA CN201710725036A CN109427515B CN 109427515 B CN109427515 B CN 109427515B CN 201710725036 A CN201710725036 A CN 201710725036A CN 109427515 B CN109427515 B CN 109427515B
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- spring
- air switch
- circuit
- hook
- surge protection
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- 230000001012 protector Effects 0.000 claims abstract description 20
- 208000025274 Lightning injury Diseases 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/40—Combined electrothermal and electromagnetic mechanisms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/10—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess voltage, e.g. for lightning protection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
- H01H9/0271—Bases, casings, or covers structurally combining a switch and an electronic component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
Abstract
The invention discloses an air switch with an inrush protection function, which comprises: the air switch body is electrically connected with the input interface and the output interface respectively and is used for disconnecting the circuit when overload or short-circuit fault occurs to the circuit; and the surge protector is respectively and electrically connected with the air switch body and the output interface and is used for shunting overvoltage to the ground to protect a load when the circuit has lightning stroke or high-voltage heavy current. The invention has the functions of both an air switch and a surge protection.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to an air switch with an inrush protection function.
Background
An air switch, also known as an air circuit breaker, is a switch that automatically opens whenever the current in the circuit exceeds the rated current. Air switches are a very important type of appliance in low voltage distribution networks and in electric traction systems. The surge protector is an indispensable device in lightning protection of electronic equipment, and has the function of limiting the instantaneous overvoltage of a power line and a signal transmission line to a voltage range which can be born by equipment or a system, or discharging strong lightning current into the ground to protect the protected equipment or the system from being damaged by impact.
The air switch and the surge protector in the prior art are two mutually independent electrical equipment, namely the existing air switch does not have a surge protection function, so that lightning stroke or high-voltage heavy current easily damages electric equipment.
Disclosure of Invention
The embodiment of the invention provides an air switch with an inrush protection function, which can have the functions of the air switch and the surge protection function.
The embodiment of the invention provides an air switch with an inrush protection function, which comprises:
the air switch body is electrically connected with the input interface and the output interface respectively and is used for disconnecting the circuit when overload or short-circuit fault occurs to the circuit; the method comprises the steps of,
and the surge protector is respectively and electrically connected with the air switch body and the output interface and is used for shunting overvoltage to the ground to protect a load when the circuit has lightning stroke or high-voltage high current.
Further, the air switch body includes a first air switch assembly, a second air switch assembly, and a third air switch assembly; the surge protector comprises a first surge protection assembly, a second surge protection assembly and a third surge protection assembly;
one end of the first air switch assembly is electrically connected with the first wiring end of the input interface, the other end of the first air switch assembly is respectively electrically connected with one end of the first surge protection assembly and the first wiring end of the output interface, and the other end of the first surge protection assembly is grounded;
one end of the second air switch assembly is electrically connected with a second wiring terminal of the input interface, the other end of the second air switch assembly is respectively electrically connected with one end of the second surge protection assembly and a second wiring terminal of the output interface, and the other end of the second surge protection assembly is grounded;
one end of the third air switch assembly is electrically connected with the third wiring end of the input interface, the other end of the third air switch assembly is respectively electrically connected with one end of the third surge protection assembly and the third wiring end of the output interface, and the other end of the third surge protection assembly is grounded.
Further, each air switch assembly comprises a first spring, a main contact, a first tripping mechanism, an electromagnetic tripping device, a bimetallic strip and a heating element;
one end of the first spring is fixed, the other end of the first spring is fixedly connected with the first tripping mechanism, and the switch of the main contact is fixedly connected with the first tripping mechanism; one end of the main contact is electrically connected with a wiring end of a corresponding input interface, the other end of the main contact is electrically connected with one end of the electromagnetic release, the other end of the electromagnetic release is electrically connected with one end of the heating element, and the other end of the heating element is respectively electrically connected with a corresponding surge protection assembly and a wiring end of an output interface; the bimetallic strip is arranged close to the heating element so as to be matched with the heating element; the first tripping mechanism is arranged close to the electromagnetic tripping device and the bimetallic strip so as to be matched with the electromagnetic tripping device and the bimetallic strip;
when the circuit is in a normal condition, the first tripping mechanism is clamped, the main contact is closed, and the first spring is in a stretching state;
when the circuit is in general overload, the heating element generates heat to enable the bimetallic strip to be heated and bent, so that the first tripping mechanism is pushed to be disconnected, and the main contact is disconnected under the action of the elastic force of the first spring;
when the circuit is short-circuited or severely overloaded, an armature in the electromagnetic release is attracted to strike the first release mechanism, and the first release mechanism is released, so that the main contact is disconnected under the action of the elastic force of the first spring.
Further, the first tripping mechanism comprises a first lock catch, a first hook, a lever and a shaft; the lever comprises a cross bar and a vertical bar;
one end of the cross rod is fixedly connected with the vertical rod, and the other end of the cross rod is arranged close to an armature in the electromagnetic release; one end of the vertical rod is fixedly connected with the first hook, and the other end of the vertical rod is arranged close to the bimetallic strip; one end of the first hook is fixed through the shaft, the other end of the first hook is matched with one end of the first lock catch so as to be clamped, and the other end of the first lock catch is fixedly connected with the first spring; the switch of the main contact is fixedly connected with the first lock catch;
when the circuit is in a normal condition, the first lock catch is clamped with the first hook, the main contact is closed, and the first spring is in a stretching state;
when the circuit is in general overload, the heating element generates heat, so that the bimetallic strip is heated and bent to push the vertical rod and drive the first hook to rotate around the shaft, the first hook is separated from the first lock catch, and the first lock catch moves under the action of the elasticity of the first spring so as to disconnect the main contact;
when the circuit is short-circuited or severely overloaded, an armature in the electromagnetic release is attracted to strike the cross rod, and the vertical rod drives the first hook to rotate around the shaft, so that the first hook is separated from the first lock catch, and the first lock catch moves under the action of the elastic force of the first spring to disconnect the main contact.
Further, each surge protection assembly includes a varistor;
one end of each piezoresistor is electrically connected with the corresponding air switch assembly and the wiring end of the output interface, and the other end of each piezoresistor is grounded;
when the circuit has lightning stroke or high voltage and large current, the piezoresistor is short-circuited, and the overvoltage is shunted to the ground, so that the voltage on the circuit is controlled within a certain range to protect a load.
Further, each of the surge protection assemblies further includes a heat sensitive plate, a second trip mechanism, a display lever, a second spring, and a third spring;
one end of each piezoresistor is electrically connected with the corresponding air switch assembly and the wiring end of the output interface through the thermosensitive piece; one end of the second spring is fixed, and the other end of the second spring is fixedly connected with the second tripping mechanism; one end of the third spring is fixed, and the other end of the third spring is fixedly connected with the display lever; the second tripping mechanism is arranged close to the thermosensitive plate and the display lever;
when the piezoresistor is normally used, the second tripping mechanism is clamped, the second spring is in a compressed state, and the display lever is green;
when the piezoresistor is damaged, the high current generated by the circuit causes the thermal sensitive sheet to be deformed and bent by heating, pushes the second tripping mechanism to be disconnected, pushes the display lever to rotate reversely by 90 degrees under the action of the elastic force of the second spring, and displays red color so as to remind a user of the damage of the piezoresistor.
Further, the second tripping mechanism comprises a second lock catch and a second hook;
one end of the second hook is provided with a bulge, the bulge is close to the thermosensitive sheet, and the other end of the second hook is matched with one end of the second lock catch so as to be clamped; one end of the second lock catch, which is close to the second hook, is fixedly connected with the second spring, and the other end of the second lock catch is close to the display lever;
when the piezoresistor is normally used, the second lock catch is clamped with the second hook, the second spring is in a compressed state, and the display lever is green;
when the piezoresistor is damaged, the high current generated by the circuit enables the heat-sensitive sheet to be deformed and bent by heating, pushes the second hook, enables the second lock catch and the second hook to be separated, and enables the second lock catch to push the display lever to rotate reversely by 90 degrees under the elastic action of the second spring, and the display lever is red to remind a user of the damage of the piezoresistor.
Further, the piezoresistor is an electronic chip which is connected in the circuit in a pluggable way.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention can combine the two components of the air switch and the surge protector into one component, thereby having the functions of the air switch and the surge protection, improving the use economy, reducing the equipment fault points, bringing great convenience to the operation and maintenance and increasing the safety and the reliability; the piezoresistor is adopted, so that the volume is small, the installation is convenient, and the air switch space is not influenced; the piezoresistors are connected in a circuit in a pluggable manner, so that the piezoresistors do not need to be rewired and powered off when being replaced or maintained.
Drawings
FIG. 1 is a schematic diagram of one embodiment of an air switch with surge protection function provided by the present invention;
fig. 2 is a schematic diagram of a specific structure of an embodiment of an air switch with surge protection function according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a schematic structural diagram of an embodiment of an air switch with surge protection function according to the present invention includes:
the air switch body 1 is electrically connected with the input interface 3 and the output interface 4 respectively and is used for disconnecting the circuit when overload or short-circuit fault occurs to the circuit; the method comprises the steps of,
and the surge protector 2 is respectively and electrically connected with the air switch body 1 and the output interface 4 and is used for shunting overvoltage to the ground to protect a load when the circuit has lightning stroke or high-voltage heavy current.
The input interface is used for inputting a power supply, and the output interface is used for connecting loads such as electric equipment and the like. The circuit of the whole air switch adopts an integrated design, and the air switch body and the surge protector are integrated inside, so that the air switch has the air switch function and the surge protection function. In addition, the air switch and the surge protector are combined into one, and two electrical connection points are changed into one electrical connection point in theory and practice, so that the equipment fault point is reduced.
Further, the air switch body 1 includes a first air switch assembly 11, a second air switch assembly 12, and a third air switch assembly 13; the surge protector comprises a first surge protection assembly 21, a second surge protection assembly 22 and a third surge protection assembly 23;
one end of the first air switch assembly 11 is electrically connected to a first terminal l1_in of the input interface, the other end of the first air switch assembly 11 is electrically connected to one end of the first surge protection assembly 21 and a first terminal l1_out of the output interface, respectively, and the other end of the first surge protection assembly 21 is grounded;
one end of the second air switch assembly 12 is electrically connected to the second terminal l2_in of the input interface, the other end of the second air switch assembly 12 is electrically connected to one end of the second surge protection assembly 22 and the second terminal l2_out of the output interface, respectively, and the other end of the second surge protection assembly 22 is grounded;
one end of the third air switch assembly 13 is electrically connected to the third terminal l3_in of the input interface, the other end of the third air switch assembly 13 is electrically connected to one end of the third surge protection assembly 23 and the third terminal l3_out of the output interface, respectively, and the other end of the third surge protection assembly 23 is grounded.
It should be noted that, the input interface and the output interface have three terminals respectively, and three terminals correspond one by one, constitute three sets of terminals, and each set of terminals corresponds to an air switch assembly and a surge protection assembly.
Further, each air switch assembly comprises a first spring K1, a main contact S, a first tripping mechanism, an electromagnetic tripping device T, a bimetallic strip M and a heating element N1;
one end of the first spring K1 is fixed, the other end of the first spring K1 is fixedly connected with the first tripping mechanism, and the switch of the main contact S is fixedly connected with the first tripping mechanism; one end of the main contact S is electrically connected with a wiring end of a corresponding input interface, the other end of the main contact S is electrically connected with one end of the electromagnetic release T, the other end of the electromagnetic release T is electrically connected with one end of the heating element N1, and the other end of the heating element N1 is respectively electrically connected with a corresponding surge protection assembly and a wiring end of an output interface; the bimetallic strip M is arranged close to the heating element N1 so as to be matched with the heating element N1; the first tripping mechanism is closely arranged with the electromagnetic tripping device T and the bimetallic strip M so as to be matched with the electromagnetic tripping device T and the bimetallic strip M;
when the circuit is in a normal condition, the first tripping mechanism is clamped, the main contact S is closed, and the first spring K1 is in a stretching state;
when the circuit is in general overload, the heating element N1 generates heat, so that the bimetallic strip M is heated and bent to push the first tripping mechanism to be disconnected, and the main contact S is disconnected under the action of the elastic force of the first spring K1;
when the circuit is short-circuited or severely overloaded, the armature in the electromagnetic release T is attracted to strike the first release mechanism, and the first release mechanism is released, so that the main contact S is disconnected under the action of the elastic force of the first spring K1.
IN the first air switch assembly 11, one end of the main contact S is electrically connected to the first terminal l1_in of the input interface, and one end of the heating element N1 is electrically connected to the first surge protection assembly 21; IN the second air switching assembly 12, one end of the main contact S is electrically connected to the second terminal l2_in of the input interface, and one end of the heating element N1 is electrically connected to the second surge protection assembly 22; IN the third air switching assembly 13, one end of the main contact S is electrically connected to the third terminal l3_in of the input interface, and one end of the heating element N1 is electrically connected to the third surge protection assembly 23.
Further, the first tripping mechanism comprises a first lock catch L1, a first hook L2, a lever and an axis Z; the lever comprises a cross bar L3 and a vertical bar L4;
one end of the cross rod L3 is fixedly connected with the vertical rod L4, and the other end of the cross rod L3 is arranged close to an armature in the electromagnetic release T; one end of the vertical rod L4 is fixedly connected with the first hook L2, and the other end of the vertical rod L4 is arranged close to the bimetallic strip M; one end of the first hook L2 is fixed through the shaft Z, the other end of the first hook L2 is matched with one end of the first lock catch L1 so as to be clamped, and the other end of the first lock catch L1 is fixedly connected with the first spring K1; the switch of the main contact S is fixedly connected with the first lock catch L1;
under the normal condition of the circuit, the first lock catch L1 is clamped with the first hook L2, the main contact S is closed, and the first spring K1 is in a stretching state;
when the circuit is in general overload, the heating element N1 generates heat, so that the bimetallic strip M is heated and bent, the vertical rod L4 is pushed, the first hook L2 is driven to rotate around the shaft Z, the first hook L2 is separated from the first lock catch L1, and the first lock catch L1 moves under the action of the elastic force of the first spring K1 to disconnect the main contact S;
when the circuit is short-circuited or severely overloaded, the armature in the electromagnetic release T is attracted to strike the cross bar L3, and drives the first hook L2 to rotate around the shaft through the vertical bar L4, so that the first hook is disengaged from the first lock catch L1, and the first lock catch L1 moves under the action of the elastic force of the first spring K1, so as to disconnect the main contact S.
The heating element N1 is disposed close to the bimetal M, so that the bimetal M can be bent by the heat generated from the heating element N1. The bimetallic strip M is arranged close to one end of the vertical rod L4, so that the bimetallic strip M can push the vertical rod L4 after being heated and bent. The armature in the electromagnetic release T is arranged close to the cross rod L3, so that the armature in the electromagnetic release T can strike the cross rod L3 when attracted.
The first trip mechanism is a set of linkage arrangements. When the main contact is closed by the operating mechanism, the main contact is locked at the closing position by the lock hook. When the circuit is in general overload, the overload current can not enable the electromagnetic release to act, but can enable the heating element to generate certain heat to enable the bimetallic strip to be heated and bent upwards, and push the lever to enable the first hook to be separated from the first lock catch, so that the main contact is disconnected, and the power supply is cut off. If short circuit or serious overload current occurs, the electromagnetic release is used for disengaging the latch hook in the first release mechanism, so that the main contact is rapidly broken under the action of the release spring.
According to different protection actions, the electromagnetic trip devices can be divided into an overcurrent trip device and an undervoltage trip device. When the electromagnetic release is an overcurrent release, the armature of the electromagnetic release is released under the normal condition of the circuit, when the circuit is in short circuit or serious overload current, the short circuit current exceeds the instantaneous release setting current value, the coil of the electromagnetic release generates enough electromagnetic attraction force, the armature in the electromagnetic release is attracted and impacts the lever, the first hook rotates upwards around the shaft to be separated from the first lock catch, the first lock catch breaks the main contact under the action of the counter-force spring, and the power supply is cut off. When the electromagnetic release is an under-voltage release, the armature inside the electromagnetic release is attracted under the normal condition of the circuit, the main contact is closed, when the circuit is in short circuit or serious overload current, the armature is released to open the main contact, and when the power supply voltage is recovered to be normal, the circuit can work after being switched on again, so that the voltage-loss protection is realized.
Further, each surge protection assembly includes a varistor RE;
one end of the piezoresistor RE is electrically connected with the corresponding air switch assembly and the wiring end of the output interface, and the other end of the piezoresistor RE is grounded;
when the circuit has lightning stroke or high voltage and large current, the piezoresistor is short-circuited, and the overvoltage is shunted to the ground, so that the voltage on the circuit is controlled within a certain range to protect a load.
It should be noted that, the technical principle of the surge protector is that the surge protector presents a high-resistance open-circuit state at low voltage and presents a low-resistance short-circuit state at high voltage.
When the electric circuit connected to the switch has lightning stroke and high voltage and high current, the overvoltage protective piezoresistor presents short circuit immediately and shunts the overvoltage to the ground, so that the voltage on the electric circuit is controlled within a certain range, and the electric equipment is protected.
Further, as shown in fig. 2, each of the surge protection assemblies further includes a thermal sensitive plate N2, a second trip mechanism, a display lever C, a second spring K2, and a third spring K3;
one end of the piezoresistor RE is electrically connected with the corresponding air switch component and the wiring end of the output interface through the thermosensitive piece N2; one end of the second spring K2 is fixed, and the other end of the second spring K2 is fixedly connected with the second tripping mechanism; one end of the third spring K3 is fixed, and the other end of the third spring K3 is fixedly connected with the display lever C; the second tripping mechanism is arranged close to the thermosensitive plate N2 and the display lever C;
when the piezoresistor RE is normally used, the second tripping mechanism is clamped, the second spring K2 is in a compressed state, and the display lever C is green;
when the piezoresistor RE is damaged, the high current generated by the circuit causes the thermal sensitive plate N2 to be deformed and bent by heating, pushes the second tripping mechanism to be disconnected, pushes the display lever C to rotate reversely by 90 degrees under the elastic force of the second spring K2, and displays the display lever C as red so as to remind a user of the damage of the piezoresistor RE.
In the first surge protection assembly 21, one end of the varistor RE is connected to one end of the heating element N1 in the first air switch assembly 11 and the first terminal l1_out of the output interface via the thermal sensitive plate N2, respectively; in the second surge protection assembly 22, one end of the piezoresistor RE is connected to one end of the heating element N1 in the second air switch assembly 12 and the second terminal l2_out of the output interface through the thermal sensitive plate N2, respectively; in the third surge protection assembly 23, one end of the varistor RE is connected to one end of the heating element N1 in the third air switching assembly 13 and the third terminal l3_out of the output interface via the thermal sensitive plate N2, respectively.
Further, the second tripping mechanism comprises a second lock catch L5 and a second hook L6;
a protrusion B is arranged at one end of the second hook L6, the protrusion B is arranged close to the thermosensitive plate N2, and the other end of the second hook L6 is matched with one end of the second lock catch L5 to be engaged; one end of the second lock catch L5, which is close to the second hook L6, is fixedly connected with the second spring K2, and the other end of the second lock catch L5 is close to the display lever C;
when the piezoresistor RE is normally used, the second lock catch L5 and the second hook L6 are clamped, the second spring K2 is in a compressed state, and the display lever C is green;
when the piezoresistor RE is damaged, the high current generated by the circuit causes the heat sensitive sheet N2 to be deformed and bent by heating, pushes the second hook L6, enables the second lock catch L5 and the second hook L6 to be separated, and enables the second lock catch L5 to push the display lever C to rotate reversely by 90 degrees under the action of the elastic force of the second spring K2, and the display lever C is red to remind a user of the damage of the piezoresistor RE.
The display lever C is green and red. When the piezoresistor RE is in normal use, the green face of the display lever C is located at the display window. When the piezoresistor RE is damaged, the heat sensitive sheet N2 is heated and bent to push the second hook L6 to be separated from the second lock catch L5, and the compressed second spring K2 pushes the second lock catch L5 to move upwards, so that the second lock catch L5 upwards pushes the display lever C, the display lever C is reversed by 90 degrees, and a red surface is displayed at the display window.
Further, the piezoresistor is an electronic chip which is connected in the circuit in a pluggable way.
It should be noted that, the piezoresistor is designed as a movable pluggable type, if damaged, the piezoresistor can be pulled out for replacement, and the display lever C is manually pushed back after the piezoresistor is replaced, so that the green surface of the display lever C is positioned at the display window.
It should be noted that, the air switch plays a very important role in the low-voltage distribution system, and is an indispensable distribution device, and the current distribution system only has the lightning protection function when the surge protector is added to the air switch, and if the air switch product with the lightning protection function is integrated, the safety of the distribution system can be greatly improved, so that a large number of applications of the lightning protection switch will become the market of new products, and the market prospect is very large.
According to the embodiment of the invention, after the two components of the air switch and the surge protector are combined into one component, only one component is required to be installed, and the electric circuit of one component is distributed; the surge protector is replaced or maintained, the rewiring is not needed, the power is not needed, and the surge protector can be replaced in a hot plug mode; the piezoresistor is adopted, so that the volume is small, the installation is convenient, and the air switch space is not influenced; the whole design circuit adopts an integrated design, and an air switch and a surge protector are integrated inside; the air switch can be used as an air switch and a surge protector, so that the use economy is improved, great convenience is brought to operation and maintenance, and the safety and reliability are improved; the protection of the line-ground is realized, and the overvoltage between the electric line and the ground is eliminated.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (3)
1. An air switch with surge protection function, comprising:
the air switch body is electrically connected with the input interface and the output interface respectively and is used for disconnecting the circuit when overload or short-circuit fault occurs to the circuit; the method comprises the steps of,
the surge protector is respectively and electrically connected with the air switch body and the output interface and is used for shunting overvoltage to the ground to protect a load when the circuit has lightning stroke or high-voltage high current;
the air switch body comprises a first air switch assembly, a second air switch assembly and a third air switch assembly; the surge protector comprises a first surge protection assembly, a second surge protection assembly and a third surge protection assembly;
one end of the first air switch assembly is electrically connected with the first wiring end of the input interface, the other end of the first air switch assembly is respectively electrically connected with one end of the first surge protection assembly and the first wiring end of the output interface, and the other end of the first surge protection assembly is grounded;
one end of the second air switch assembly is electrically connected with a second wiring terminal of the input interface, the other end of the second air switch assembly is respectively electrically connected with one end of the second surge protection assembly and a second wiring terminal of the output interface, and the other end of the second surge protection assembly is grounded;
one end of the third air switch assembly is electrically connected with a third wiring terminal of the input interface, the other end of the third air switch assembly is respectively electrically connected with one end of the third surge protection assembly and a third wiring terminal of the output interface, and the other end of the third surge protection assembly is grounded;
each surge protection assembly comprises a piezoresistor which is an electronic chip connected in the circuit in a pluggable manner; one end of each piezoresistor is electrically connected with the corresponding air switch assembly and the wiring end of the output interface, and the other end of each piezoresistor is grounded; when the circuit has lightning stroke or high-voltage high current, the piezoresistor is short-circuited, and the overvoltage is shunted to the ground, so that the voltage on the circuit is controlled within a certain range to protect a load;
each air switch assembly comprises a first spring, a main contact, a first tripping mechanism, an electromagnetic tripping device, a bimetallic strip and a heating element;
one end of the first spring is fixed, the other end of the first spring is fixedly connected with the first tripping mechanism, and the switch of the main contact is fixedly connected with the first tripping mechanism; one end of the main contact is electrically connected with a wiring end of a corresponding input interface, the other end of the main contact is electrically connected with one end of the electromagnetic release, the other end of the electromagnetic release is electrically connected with one end of the heating element, and the other end of the heating element is respectively electrically connected with a corresponding surge protection assembly and a wiring end of an output interface; the bimetallic strip is arranged close to the heating element so as to be matched with the heating element; the first tripping mechanism is arranged close to the electromagnetic tripping device and the bimetallic strip so as to be matched with the electromagnetic tripping device and the bimetallic strip;
when the circuit is in a normal condition, the first tripping mechanism is clamped, the main contact is closed, and the first spring is in a stretching state;
when the circuit is in general overload, the heating element generates heat to enable the bimetallic strip to be heated and bent, so that the first tripping mechanism is pushed to be disconnected, and the main contact is disconnected under the action of the elastic force of the first spring;
when the circuit is short-circuited or severely overloaded, an armature in the electromagnetic release is attracted to strike the first release mechanism, and the first release mechanism is released, so that the main contact is disconnected under the action of the elastic force of the first spring;
each surge protection assembly further comprises a heat sensitive plate, a second tripping mechanism, a display lever, a second spring and a third spring;
one end of each piezoresistor is electrically connected with the corresponding air switch assembly and the wiring end of the output interface through the thermosensitive piece; one end of the second spring is fixed, and the other end of the second spring is fixedly connected with the second tripping mechanism; one end of the third spring is fixed, and the other end of the third spring is fixedly connected with the display lever; the second tripping mechanism is arranged close to the thermosensitive plate and the display lever;
when the piezoresistor is normally used, the second tripping mechanism is clamped, the second spring is in a compressed state, and the display lever is green;
when the piezoresistor is damaged, the high current generated by the circuit causes the thermal sensitive sheet to be deformed and bent by heating, pushes the second tripping mechanism to be disconnected, pushes the display lever to rotate reversely by 90 degrees under the action of the elastic force of the second spring, and displays red color so as to remind a user of the damage of the piezoresistor.
2. The air switch with surge protection function of claim 1, wherein the first trip mechanism comprises a first latch, a first catch, a lever, and a shaft; the lever comprises a cross bar and a vertical bar;
one end of the cross rod is fixedly connected with the vertical rod, and the other end of the cross rod is arranged close to an armature in the electromagnetic release; one end of the vertical rod is fixedly connected with the first hook, and the other end of the vertical rod is arranged close to the bimetallic strip; one end of the first hook is fixed through the shaft, the other end of the first hook is matched with one end of the first lock catch so as to be clamped, and the other end of the first lock catch is fixedly connected with the first spring; the switch of the main contact is fixedly connected with the first lock catch;
when the circuit is in a normal condition, the first lock catch is clamped with the first hook, the main contact is closed, and the first spring is in a stretching state;
when the circuit is in general overload, the heating element generates heat, so that the bimetallic strip is heated and bent to push the vertical rod and drive the first hook to rotate around the shaft, the first hook is separated from the first lock catch, and the first lock catch moves under the action of the elasticity of the first spring so as to disconnect the main contact;
when the circuit is short-circuited or severely overloaded, an armature in the electromagnetic release is attracted to strike the cross rod, and the vertical rod drives the first hook to rotate around the shaft, so that the first hook is separated from the first lock catch, and the first lock catch moves under the action of the elastic force of the first spring to disconnect the main contact.
3. The air switch with surge protection function of claim 1, wherein the second trip mechanism comprises a second latch and a second catch;
one end of the second hook is provided with a bulge, the bulge is close to the thermosensitive sheet, and the other end of the second hook is matched with one end of the second lock catch so as to be clamped; one end of the second lock catch, which is close to the second hook, is fixedly connected with the second spring, and the other end of the second lock catch is close to the display lever;
when the piezoresistor is normally used, the second lock catch is clamped with the second hook, the second spring is in a compressed state, and the display lever is green;
when the piezoresistor is damaged, the high current generated by the circuit enables the heat-sensitive sheet to be deformed and bent by heating, pushes the second hook, enables the second lock catch and the second hook to be separated, and enables the second lock catch to push the display lever to rotate reversely by 90 degrees under the elastic action of the second spring, and the display lever is red to remind a user of the damage of the piezoresistor.
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| CN201710725036.XA CN109427515B (en) | 2017-08-22 | 2017-08-22 | Air switch with surge protection function |
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| CN201710725036.XA CN109427515B (en) | 2017-08-22 | 2017-08-22 | Air switch with surge protection function |
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| CN109427515B true CN109427515B (en) | 2024-04-09 |
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| CN109427515A (en) | 2019-03-05 |
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