CN110931322A - Miniature circuit breaker with electric switching-on and switching-off device - Google Patents
Miniature circuit breaker with electric switching-on and switching-off device Download PDFInfo
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- CN110931322A CN110931322A CN201911200091.2A CN201911200091A CN110931322A CN 110931322 A CN110931322 A CN 110931322A CN 201911200091 A CN201911200091 A CN 201911200091A CN 110931322 A CN110931322 A CN 110931322A
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- switching
- circuit breaker
- closing
- temperature
- expansion body
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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
- H01H71/14—Electrothermal mechanisms
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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
- H01H71/42—Induction-motor, induced-current, or electrodynamic release mechanisms
- H01H71/43—Electrodynamic release mechanisms
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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
- H01H71/66—Power reset mechanisms
- H01H71/70—Power reset mechanisms actuated by electric motor
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Abstract
The invention provides a miniature circuit breaker with an electric switching-on and switching-off device, which comprises a motor, a motion mechanism, a controller, a motor driving circuit and a switching-on and switching-off detection mechanism, wherein the motion mechanism is used for driving a switching-on and switching-off handle to move to perform switching-on and switching-off operations, the switching-on and switching-off detection mechanism comprises a support plate, an expansion body, a transmission rod, a first induction switch and a second induction switch, the expansion body pushes the transmission rod to move and trigger the first induction switch when the expansion body is at a first temperature, the first induction switch feeds back a switching-on locking signal, the expansion body pushes the transmission rod to move and trigger the second induction switch when the expansion body is at a second temperature, the second induction switch feeds back a switching-on unlocking signal, the controller receives the switching-on locking signal and locks the. According to the invention, through setting the reasonable first temperature and the second temperature, automatic over-temperature protection can be provided for the miniature circuit breaker, and the circuit breaker is prevented from being damaged and burnt out due to overhigh temperature.
Description
Technical Field
The invention relates to the field of circuit breakers, in particular to a miniature circuit breaker with an electric switching-on and switching-off device.
Background
The circuit breaker is a switching device capable of closing, carrying, and opening/closing a current under a normal circuit condition and a current under an abnormal circuit condition for a predetermined time. The existing small circuit breaker with the electric switching-on and switching-off function in the market mostly does not have the high-temperature automatic locking and switching-on function, so that the circuit breaker is easy to damage and burn out due to high temperature.
A large number of typical prior arts are found through retrieval, for example, a patent with the application number of 201310335538.3 discloses a miniature circuit breaker which comprises a miniature circuit breaker body and an electric switching-on and switching-off device. And if the patent with the application number of 201310334210.0 discloses an electric opening and closing type miniature circuit breaker, the invention can realize remote intelligent control, so that the circuit breaker can be used in a smart power grid, and the manufacturing cost is effectively reduced. And if the patent with the application number of 201310335556.1 discloses a miniature circuit breaker, which comprises a miniature circuit breaker body and an electric switching-on and switching-off device, wherein the electric switching-on and switching-off device is provided with an insulating shell, a shifting handle and an electric mechanism.
Therefore, for a small circuit breaker with an electric switching function, many practical problems (high-temperature automatic locking and switching function, simplified structure and the like) to be dealt with urgently in practical application still have unreported concrete solutions.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a miniature circuit breaker with an electric switching-on and switching-off device, which has the following specific technical scheme:
a miniature circuit breaker with an electric switching-on and switching-off device comprises a motor, a motion mechanism, a controller, a motor driving circuit and a switching-on and switching-off detection mechanism;
one end of the motion mechanism is connected with the motor, and the other end of the motion mechanism is connected with the opening and closing handle of the miniature circuit breaker and drives the opening and closing handle to move to perform opening and closing operation;
the opening and closing detection mechanism comprises a support plate, an expansion body, a transmission rod, a first induction switch and a second induction switch, wherein the expansion body, the first induction switch and the second induction switch are all arranged on the support plate, the transmission rod is connected with the expansion body, the expansion body expands under heat to generate volume-displacement change to push the transmission rod to move, the expansion body pushes the transmission rod to move and trigger the first induction switch at a first temperature, the first induction switch feeds a closing locking signal back to the controller, the expansion body pushes the transmission rod to move and trigger the second induction switch at a second temperature, and the second induction switch feeds a closing unlocking signal back to the controller;
the controller receives a closing locking signal and locks a motor driving circuit, so that the motor cannot drive the movement mechanism to move to perform closing operation of the circuit breaker;
the controller receives a closing unlocking signal and unlocks a motor driving circuit, so that the motor can drive the movement mechanism to move to perform the opening and closing operation of the circuit breaker;
wherein the first temperature is greater than the second temperature.
It is optional, motion includes output gear, mounting panel, drive gear and thumb wheel, the output shaft of output gear and motor, output gear and drive gear meshing, drive gear and thumb wheel rotationally set up on the mounting panel, be equipped with the groove of dialling that runs through the thumb wheel along thumb wheel the central axis direction on the periphery wall of thumb wheel, dial the inslot and be equipped with the driving lever portion that passes the mounting panel, the other end and the circuit breaker divide-shut brake handle of dialing the pole portion are connected, the thumb wheel drives the reciprocal rotation of thumb wheel portion and drives circuit breaker divide-shut brake handle and divide-shut brake action in reciprocating motion, be equipped with the dialling tooth that is less than the semicircle on the thumb wheel, dialling tooth and drive gear meshing, the angle of dialling tooth place circumference is greater than the required turned angle of circuit breaker divide-shut brake.
Optionally, the expansion body is a casing including a sealed cavity, the transfer rod is a push rod piston, a push rod through hole is formed in the top end face of the casing, the push rod piston is movably arranged in the push rod through hole, the push rod piston is connected with the casing in a sealing mode, a fluid medium, a phase change expansion substance and an isolation diaphragm are installed in the sealed cavity, the isolation diaphragm is arranged between the fluid substance and the phase change expansion substance, one end of the push rod piston penetrates through the push rod through hole and is connected with the sliding plate, and the other end of the push rod piston is inserted into the fluid medium.
Optionally, a protrusion is arranged on the ejector rod piston, the first inductive switch and the second inductive switch are located on one side of the protrusion of the ejector rod piston, the expansion body pushes the ejector rod piston to move at a first temperature, the roller of the first inductive switch is compressed by the protrusion and feeds back a closing locking signal, the expansion body pushes the ejector rod piston to move at a second temperature, and the roller of the second inductive switch is compressed by the protrusion and feeds back a closing unlocking signal.
Optionally, a sealing element is arranged between the ejector rod piston and the shell, and the sealing element is an O-shaped sealing ring, a sealing gasket or an annular sealing sleeve.
Optionally, the phase change expanding substance is paraffin, and the fluid medium is liquid lubricating oil, lubricating grease or sealing grease.
Optionally, the first inductive switch and the second inductive switch are both microswitches.
The beneficial effects obtained by the invention comprise: through setting up reasonable first temperature and second temperature value, can provide automatic overtemperature protection for miniature circuit breaker, prevent that the circuit breaker from because the high temperature from destroying and burning out.
Drawings
The present invention will be further understood from the following description taken in conjunction with the accompanying drawings, the emphasis instead being placed upon illustrating the principles of the embodiments.
Fig. 1 is a schematic structural diagram of a miniature circuit breaker with a switching-closing device according to one embodiment of the present invention;
FIG. 2 is a schematic view of the overall structure of a motion mechanism according to one embodiment of the present invention;
fig. 3 is a first schematic structural diagram of a switching detection mechanism according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a switching-on/switching-off detection mechanism according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a switching detection mechanism in one embodiment of the present invention;
fig. 6 is a schematic structural diagram of a switching detection mechanism according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to embodiments thereof; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Other systems, methods, and/or features of the present embodiments will become apparent to those skilled in the art upon review of the following detailed description. It is intended that all such additional systems, methods, features and advantages be included within this description, be within the scope of the invention, and be protected by the accompanying claims. Additional features of the disclosed embodiments are described in, and will be apparent from, the detailed description that follows.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms described above will be understood by those of ordinary skill in the art according to the specific circumstances.
The invention relates to a miniature circuit breaker with an electric opening and closing function, which explains the following embodiments according to the attached drawings:
the first embodiment is as follows:
as shown in fig. 1, a miniature circuit breaker with an electric switching device includes a motor, a movement mechanism, a controller, a motor drive circuit, and a switching detection mechanism.
One end of the motion mechanism is connected with the motor, and the other end of the motion mechanism is connected with the opening and closing handle of the miniature circuit breaker and drives the opening and closing handle to move to perform opening and closing operation. The motor is used for driving the movement mechanism to move, and then the opening and closing handle is driven to act so as to complete the opening and closing operation.
As shown in fig. 2, the motion mechanism preferably includes an output gear 20, a mounting plate 21, a transmission gear 22 and a thumb wheel 23, wherein the output gear 20 is connected with an output shaft of the motor. The output gear 20 is engaged with a transmission gear 22, and the transmission gear 22 and a thumb wheel 23 are rotatably arranged on the mounting plate 21. The motor may be disposed on the other side (not shown) of the mounting plate 21, and an output shaft thereof may be rotatably connected to the output gear 20 after passing through the mounting plate 21. Be equipped with on the periphery wall of thumb wheel 23 along the thumb wheel 23 the central axis direction run through the groove 24 of dialling of thumb wheel 23, be equipped with the driving lever portion 25 that passes mounting panel 21 in the groove 24 of dialling, the other end and the circuit breaker divide-shut brake handle of thumb lever portion 25 are connected, thumb wheel 23 drives the reciprocal rotation of thumb lever portion 25 and drives the circuit breaker divide-shut brake handle and carry out the divide-shut brake action in reciprocating motion, be equipped with the group tooth 26 that is less than the semicircle on the thumb wheel 23, dial tooth 26 and the meshing of drive gear 22, the angle of the circumference of group tooth 26 place is greater than the required turned angle of circuit breaker divide-shut brake operation. When the motor rotates, the output gear 20 drives the transmission gear 22 to move, and then the dial wheel 23 is driven to reciprocate and drives the dial rod part 25 to rotate and the breaker opening and closing handle to act so as to complete the breaker opening and closing operation.
As shown in fig. 3, the switching-on/off detection mechanism includes a support plate 30, an expansion body 31, a transmission rod 32, a first inductive switch 33, and a second inductive switch 34, where the expansion body 31, the first inductive switch 33, and the second inductive switch 34 are all mounted on the support plate 30, the transmission rod 32 is connected to the expansion body 31, the expansion body 31 is expanded by heat to generate a volume-displacement change to push the transmission rod 32 to move, the expansion body 31 pushes the transmission rod 32 to move and trigger the first inductive switch 33 at a first temperature, the first inductive switch 33 feeds back a switching-on locking signal to the controller, the expansion body 31 pushes the transmission rod 32 to move and trigger the second inductive switch 34 at a second temperature, and the second inductive switch 34 feeds back a switching-on unlocking signal to the controller. In this embodiment, the first inductive switch 33 and the second inductive switch 34 are micro switches.
As shown in fig. 3, as a preferable scheme, the expansion body 31 is a housing 310 including a sealed cavity, the transmission rod 32 is a push rod piston, a push rod through hole is formed on a top end surface of the housing 310, the push rod piston is movably disposed in the push rod through hole, the push rod piston is hermetically connected with the housing 310, a fluid medium 313, a phase change expansion substance 311 and an isolation diaphragm 312 are installed in the sealed cavity, the isolation diaphragm 312 is disposed between the fluid substance and the phase change expansion substance 311, one end of the push rod piston passes through the push rod through hole and is connected with the sliding plate, and the other end of the push rod piston is inserted into the fluid medium 313. The phase change expansion substance 311 expands when heated, and the volume of the phase change expansion substance increases, so that the push rod piston is pushed to move. The expansion body 31 pushes the ejector rod piston to move at a first temperature, the roller of the first induction switch 33 is compressed by the bulge 35 and feeds back a closing locking signal, the expansion body 31 pushes the ejector rod piston to move at a second temperature, and the roller of the second induction switch 34 is compressed by the bulge 35 and feeds back a closing unlocking signal.
The phase change expansion substance 311 pushes the ejector rod piston to move and trigger the first inductive switch 33 at a first temperature, the first inductive switch 33 feeds back a closing locking signal to the controller, the phase change expansion substance 311 pushes the ejector rod piston to move and trigger the second inductive switch 34 at a second temperature, and the second inductive switch 34 feeds back a closing unlocking signal to the controller. The controller receives a closing locking signal, and when the temperature of the circuit breaker is judged to exceed a preset threshold value, the motor driving circuit is locked after the circuit breaker is subjected to opening operation, so that the motor cannot rotate, namely, the circuit breaker is limited on an opening position, and the circuit breaker cannot be subjected to closing operation through the driving motion mechanism. And after the controller receives a closing unlocking signal and judges that the temperature of the circuit breaker is recovered to the normal condition, unlocking the motor driving circuit to enable the motor to rotate freely and drive the motion mechanism to perform normal opening and closing operation.
Here, the first temperature is greater than the second temperature, and the temperature values of the first temperature and the second temperature can be adjusted and set according to actual needs, for example, by setting a relative position distance between the first inductive switch 33 and the second inductive switch 34, or setting a volume ratio of the plunger piston to the phase change expanding material 311, and the like, which is not described herein again.
Preferably, the phase change expanding material 311 is paraffin, and the fluid medium 313 is liquid lubricant, grease or sealing grease. A sealing element 314 is arranged between the ejector rod piston and the shell 310, and the sealing element 314 adopts an O-shaped sealing ring, a sealing gasket or an annular sealing sleeve.
Through setting up reasonable first temperature and second temperature value, can provide the excess temperature protection for miniature circuit breaker, prevent that the circuit breaker from because the high temperature from destroying and burning out.
Example two:
as shown in fig. 1, a miniature circuit breaker with an electric switching device includes a motor, a movement mechanism, a controller, a motor drive circuit, and a switching detection mechanism.
One end of the motion mechanism is connected with the motor, and the other end of the motion mechanism is connected with the opening and closing handle of the miniature circuit breaker and drives the opening and closing handle to move to perform opening and closing operation. The motor is used for driving the movement mechanism to move, and then the opening and closing handle is driven to act so as to complete the opening and closing operation.
As shown in fig. 2, the motion mechanism preferably includes an output gear 20, a mounting plate 21, a transmission gear 22 and a thumb wheel 23, wherein the output gear 20 is connected with an output shaft of the motor. The output gear 20 is engaged with a transmission gear 22, and the transmission gear 22 and a thumb wheel 23 are rotatably arranged on the mounting plate 21. The motor may be disposed on the other side of the mounting plate 21, and an output shaft thereof may be rotatably coupled to the output gear 20 after passing through the mounting plate 21. Be equipped with on the periphery wall of thumb wheel 23 along the thumb wheel 23 the central axis direction run through the groove 24 of dialling of thumb wheel 23, be equipped with the driving lever portion 25 that passes mounting panel 21 in the groove 24 of dialling, the other end and the circuit breaker divide-shut brake handle of thumb lever portion 25 are connected, thumb wheel 23 drives the reciprocal rotation of thumb lever portion 25 and drives the circuit breaker divide-shut brake handle and carry out the divide-shut brake action in reciprocating motion, be equipped with the group tooth 26 that is less than the semicircle on the thumb wheel 23, dial tooth 26 and the meshing of drive gear 22, the angle of the circumference of group tooth 26 place is greater than the required turned angle of circuit breaker divide-shut brake operation. When the motor rotates, the output gear 20 drives the transmission gear 22 to move, and then the dial wheel 23 is driven to reciprocate and drives the dial rod part 25 to rotate and the breaker opening and closing handle to act so as to complete the breaker opening and closing operation.
As shown in fig. 4, the switching-on/off detection mechanism includes a support plate 30, an expansion body 31, a transmission rod 32, a first inductive switch 33, and a second inductive switch 34, where the expansion body 31, the first inductive switch 33, and the second inductive switch 34 are all mounted on the support plate 30, the transmission rod 32 is connected to the expansion body 31, the expansion body 31 is expanded by heat to generate a volume-displacement change to push the transmission rod 32 to move, the expansion body 31 pushes the transmission rod 32 to move and trigger the first inductive switch 33 at a first temperature, the first inductive switch 33 feeds back a switching-on locking signal to the controller, the expansion body 31 pushes the transmission rod 32 to move and trigger the second inductive switch 34 at a second temperature, and the second inductive switch 34 feeds back a switching-on unlocking signal to the controller. In this embodiment, the first inductive switch 33 and the second inductive switch 34 are micro switches.
As shown in fig. 4, as a preferable scheme, the expansion body 31 is a housing 310 including a sealed cavity, the transmission rod 32 is a push rod piston, a push rod through hole is formed on a top end surface of the housing 310, the push rod piston is movably disposed in the push rod through hole, the push rod piston is hermetically connected with the housing 310, a fluid medium 313, a phase change expansion substance 311 and an isolation diaphragm 312 are installed in the sealed cavity, the isolation diaphragm 312 is disposed between the fluid substance and the phase change expansion substance 311, one end of the push rod piston passes through the push rod through hole and is connected with the sliding plate, and the other end of the push rod piston is inserted into the fluid medium 313. The phase change expansion substance 311 expands when heated, and the volume of the phase change expansion substance increases, so that the push rod piston is pushed to move. The expansion body 31 pushes the ejector rod piston to move at a first temperature, the roller of the first induction switch 33 is compressed by the bulge 35 and feeds back a closing locking signal, the expansion body 31 pushes the ejector rod piston to move at a second temperature, and the roller of the second induction switch 34 is compressed by the bulge 35 and feeds back a closing unlocking signal.
As shown in fig. 4, a coil spring 36 is also provided between the ram piston and the housing 310. When the temperature of expansion body 31 decreases, the ram piston can be better pushed back into the sealed cavity within housing 310 by coil spring 36.
The phase change expansion substance 311 pushes the ejector rod piston to move and trigger the first inductive switch 33 at a first temperature, the first inductive switch 33 feeds back a closing locking signal to the controller, the phase change expansion substance 311 pushes the ejector rod piston to move and trigger the second inductive switch 34 at a second temperature, and the second inductive switch 34 feeds back a closing unlocking signal to the controller. The controller receives a closing locking signal, and when the temperature of the circuit breaker is judged to exceed a preset threshold value, the motor driving circuit is locked after the circuit breaker is subjected to opening operation, so that the motor cannot rotate, namely, the circuit breaker is limited on an opening position, and the circuit breaker cannot be subjected to closing operation through the driving motion mechanism. And after the controller receives a closing unlocking signal and judges that the temperature of the circuit breaker is recovered to the normal condition, unlocking the motor driving circuit to enable the motor to rotate freely and drive the motion mechanism to perform normal opening and closing operation.
Here, the first temperature is greater than the second temperature, and the temperature values of the first temperature and the second temperature can be adjusted and set according to actual needs, for example, by setting a relative position distance between the first inductive switch 33 and the second inductive switch 34, or setting a volume ratio of the plunger piston to the phase change expanding material 311, and the like, which is not described herein again.
Preferably, the phase change expanding material 311 is paraffin, and the fluid medium 313 is liquid lubricant, grease or sealing grease. A sealing element 314 is arranged between the ejector rod piston and the shell 310, and the sealing element 314 adopts an O-shaped sealing ring, a sealing gasket or an annular sealing sleeve.
Through setting up reasonable first temperature and second temperature value, can provide the excess temperature protection for miniature circuit breaker, prevent that the circuit breaker from because the high temperature from destroying and burning out.
Example three:
as shown in fig. 1, a miniature circuit breaker with an electric switching device includes a motor, a movement mechanism, a controller, a motor drive circuit, and a switching detection mechanism.
One end of the motion mechanism is connected with the motor, and the other end of the motion mechanism is connected with the opening and closing handle of the miniature circuit breaker and drives the opening and closing handle to move to perform opening and closing operation. The motor is used for driving the movement mechanism to move, and then the opening and closing handle is driven to act so as to complete the opening and closing operation.
As shown in fig. 2, the motion mechanism preferably includes an output gear 20, a mounting plate 21, a transmission gear 22 and a thumb wheel 23, wherein the output gear 20 is connected with an output shaft of the motor. The output gear 20 is engaged with a transmission gear 22, and the transmission gear 22 and a thumb wheel 23 are rotatably arranged on the mounting plate 21. The motor may be disposed on the other side of the mounting plate 21, and an output shaft thereof may be rotatably coupled to the output gear 20 after passing through the mounting plate 21. Be equipped with on the periphery wall of thumb wheel 23 along the thumb wheel 23 the central axis direction run through the groove 24 of dialling of thumb wheel 23, be equipped with the driving lever portion 25 that passes mounting panel 21 in the groove 24 of dialling, the other end and the circuit breaker divide-shut brake handle of thumb lever portion 25 are connected, thumb wheel 23 drives the reciprocal rotation of thumb lever portion 25 and drives the circuit breaker divide-shut brake handle and carry out the divide-shut brake action in reciprocating motion, be equipped with the group tooth 26 that is less than the semicircle on the thumb wheel 23, dial tooth 26 and the meshing of drive gear 22, the angle of the circumference of group tooth 26 place is greater than the required turned angle of circuit breaker divide-shut brake operation. When the motor rotates, the output gear 20 drives the transmission gear 22 to move, and then the dial wheel 23 is driven to reciprocate and drives the dial rod part 25 to rotate and the breaker opening and closing handle to act so as to complete the breaker opening and closing operation.
As shown in fig. 5, the switching-on/off detection mechanism includes a support plate 30, an expansion body 31, a transmission rod 32, a first inductive switch 33, and a second inductive switch 34, where the expansion body 31, the first inductive switch 33, and the second inductive switch 34 are all mounted on the support plate 30, the transmission rod 32 is connected to the expansion body 31, the expansion body 31 is expanded by heat to generate a volume-displacement change to push the transmission rod 32 to move, the expansion body 31 pushes the transmission rod 32 to move and trigger the first inductive switch 33 at a first temperature, the first inductive switch 33 feeds back a switching-on locking signal to the controller, the expansion body 31 pushes the transmission rod 32 to move and trigger the second inductive switch 34 at a second temperature, and the second inductive switch 34 feeds back a switching-on unlocking signal to the controller. In this embodiment, the first inductive switch 33 and the second inductive switch 34 are micro switches.
As shown in fig. 5, as a preferable scheme, the expansion body 31 is a housing 310 including a sealed cavity, the transmission rod 32 is a push rod piston, a push rod through hole is formed on a top end surface of the housing 310, the push rod piston is movably disposed in the push rod through hole, the push rod piston is hermetically connected with the housing 310, a fluid medium 313, a phase change expansion substance 311 and an isolation diaphragm 312 are installed in the sealed cavity, the isolation diaphragm 312 is disposed between the fluid substance and the phase change expansion substance 311, one end of the push rod piston passes through the push rod through hole and is connected with the sliding plate, and the other end of the push rod piston is inserted into the fluid medium 313. The phase change expansion substance 311 expands when heated, and the volume of the phase change expansion substance increases, so that the push rod piston is pushed to move. The tail end of the ejector rod piston is provided with a spring, a protrusion 35 is arranged on the ejector rod piston, the second inductive switch 34 is located on one side of the protrusion 35 of the ejector rod piston, and the first inductive switch 33 is located on the right side of the tail end of the ejector rod piston. The expansion body 31 pushes the ejector rod piston to move at a first temperature, the roller of the first inductive switch 33 is compressed by the spring and feeds back a closing locking signal, the expansion body 31 pushes the ejector rod piston to move at a second temperature, and the roller of the second inductive switch 34 is compressed by the protrusion 35 and feeds back a closing unlocking signal.
The inner diameter of the spring is slightly smaller than the roller diameter of the first inductive switch 33 so that the spring can better compress the roller of the first inductive switch 33 at the first temperature.
As shown in fig. 5, a coil spring 36 is also provided between the ram piston and the housing 310. When the temperature of expansion body 31 decreases, the ram piston can be better pushed back into the sealed cavity within housing 310 by coil spring 36.
The phase change expansion substance 311 pushes the ejector rod piston to move and trigger the first inductive switch 33 at a first temperature, the first inductive switch 33 feeds back a closing locking signal to the controller, the phase change expansion substance 311 pushes the ejector rod piston to move and trigger the second inductive switch 34 at a second temperature, and the second inductive switch 34 feeds back a closing unlocking signal to the controller. The controller receives a closing locking signal, and when the temperature of the circuit breaker is judged to exceed a preset threshold value, the motor driving circuit is locked after the circuit breaker is subjected to opening operation, so that the motor cannot rotate, namely, the circuit breaker is limited on an opening position, and the circuit breaker cannot be subjected to closing operation through the driving motion mechanism. And after the controller receives a closing unlocking signal and judges that the temperature of the circuit breaker is recovered to the normal condition, unlocking the motor driving circuit to enable the motor to rotate freely and drive the motion mechanism to perform normal opening and closing operation.
Here, the first temperature is greater than the second temperature, and the temperature values of the first temperature and the second temperature can be adjusted and set according to actual needs, for example, by setting a relative position distance between the first inductive switch 33 and the second inductive switch 34, or setting a volume ratio of the plunger piston to the phase change expanding material 311, and the like, which is not described herein again.
Preferably, the phase change expanding material 311 is paraffin, and the fluid medium 313 is liquid lubricant, grease or sealing grease. A sealing element 314 is arranged between the ejector rod piston and the shell 310, and the sealing element 314 adopts an O-shaped sealing ring, a sealing gasket or an annular sealing sleeve.
Through setting up reasonable first temperature and second temperature value, can provide the excess temperature protection for miniature circuit breaker, prevent that the circuit breaker from because the high temperature from destroying and burning out.
Example four:
the present embodiment is substantially the same as the previous three embodiments, except that as shown in fig. 6, the opening and closing detection mechanism includes a support plate 30, an expansion body 31, a transmission rod 32, a first inductive switch 33, and a second inductive switch 34, where the expansion body 31, the first inductive switch 33, and the second inductive switch 34 are all mounted on the support plate 30, the transmission rod 32 is connected to the expansion body 31, the expansion body 31 is expanded by heat to generate a volume-displacement change to push the transmission rod 32 to move, the expansion body 31 pushes the transmission rod 32 to move and trigger the first inductive switch 33 at a first temperature, the first inductive switch 33 feeds back a closing locking signal to the controller, the expansion body 31 pushes the transmission rod 32 to move and trigger the second inductive switch 34 at a second temperature, and the second inductive switch 34 feeds back a closing unlocking signal to the controller.
As shown in fig. 6, the expansion body 31 is a housing 310 including a sealed cavity, the transmission rod 32 is a push rod piston, a push rod through hole is formed in the top end surface of the housing 310, the push rod piston is movably disposed in the push rod through hole, the push rod piston is hermetically connected with the housing 310, a fluid medium 313, a phase change expansion substance 311 and an isolation diaphragm 312 are mounted in the sealed cavity, the isolation diaphragm 312 is disposed between the fluid substance and the phase change expansion substance 311, one end of the push rod piston passes through the push rod through hole and is connected with the sliding plate, and the other end of the push rod piston is inserted into the fluid medium 313. The phase change expansion substance 311 expands when heated, and the volume of the phase change expansion substance increases, so that the push rod piston is pushed to move.
The opening and closing detection mechanism further comprises a first connecting rod 37 and a second connecting rod 38, one end of the first connecting rod 37 is hinged to one end of the ejector rod piston, the other end of the first connecting rod 37 is hinged to one end of the second connecting rod 38, the second connecting rod 38 is pivoted with the support plate 30 through a pin shaft, and the second connecting rod 38 can rotate circumferentially by taking the pin shaft as an axis. The first inductive switch 33 and the second inductive switch 34 are located on an arc line of the other end of the second link 38.
The ram piston drives the second link 38 via the first link 37. The expansion body 31 pushes the ram piston to move at a first temperature, the roller of the first inductive switch 33 is compressed by the other end of the second connecting rod 38 and feeds back a closing locking signal, the expansion body 31 pushes the ram piston to move at a second temperature, and the roller of the second inductive switch 34 is compressed by the other end of the second connecting rod 38 and feeds back a closing unlocking signal.
In summary, the miniature circuit breaker with the electric switching on/off device disclosed by the invention has the following beneficial technical effects: through setting up reasonable first temperature and second temperature value, can provide automatic overtemperature protection for miniature circuit breaker, prevent that the circuit breaker from because the high temperature from destroying and burning out.
Although the invention has been described above with reference to various embodiments, it should be understood that many changes and modifications may be made without departing from the scope of the invention. That is, the methods, systems, and devices discussed above are examples, and various configurations may omit, replace, or add various processes or components as appropriate. For example, in alternative configurations, the methods may be performed in an order different than that described and/or various components may be added, omitted, and/or combined. Moreover, features described with respect to certain configurations may be combined in various other configurations, as different aspects and elements of the configurations may be combined in a similar manner. Further, elements therein may be updated as technology evolves, i.e., many of the elements are examples and do not limit the scope of the disclosure or claims.
Specific details are given in the description to provide a thorough understanding of the exemplary configurations including implementations. However, configurations may be practiced without these specific details, such as well-known circuits, processes, algorithms, structures, and techniques, which have been shown without unnecessary detail in order to avoid obscuring the configurations. This description provides example configurations only, and does not limit the scope, applicability, or configuration of the claims. Rather, the foregoing description of the configurations will provide those skilled in the art with an enabling description for implementing the described techniques. Various changes may be made in the function and arrangement of elements without departing from the spirit or scope of the disclosure.
It is intended that the foregoing detailed description be regarded as illustrative rather than limiting, and that it be understood that it is the following claims, including all equivalents, that are intended to define the spirit and scope of this invention. The above examples are to be construed as merely illustrative and not limitative of the remainder of the disclosure. After reading the description of the invention, the skilled person can make various changes or modifications to the invention, and these equivalent changes and modifications also fall into the scope of the invention defined by the claims.
Claims (7)
1. A miniature circuit breaker with an electric switching-on/off device is characterized by comprising a motor, a motion mechanism, a controller, a motor driving circuit and a switching-on/off detection mechanism;
one end of the motion mechanism is connected with the motor, and the other end of the motion mechanism is connected with the opening and closing handle of the miniature circuit breaker and drives the opening and closing handle to move to perform opening and closing operation;
the opening and closing detection mechanism comprises a support plate, an expansion body, a transmission rod, a first induction switch and a second induction switch, wherein the expansion body, the first induction switch and the second induction switch are all arranged on the support plate, the transmission rod is connected with the expansion body, the expansion body expands under heat to generate volume-displacement change to push the transmission rod to move, the expansion body pushes the transmission rod to move and trigger the first induction switch at a first temperature, the first induction switch feeds a closing locking signal back to the controller, the expansion body pushes the transmission rod to move and trigger the second induction switch at a second temperature, and the second induction switch feeds a closing unlocking signal back to the controller;
the controller receives a closing locking signal and locks a motor driving circuit, so that the motor cannot drive the movement mechanism to move to perform closing operation of the circuit breaker;
the controller receives a closing unlocking signal and unlocks a motor driving circuit, so that the motor can drive the movement mechanism to move to perform the opening and closing operation of the circuit breaker;
wherein the first temperature is greater than the second temperature.
2. A miniature circuit breaker having an electric switching-on/off device according to claim 1, the motion mechanism comprises an output gear, a mounting plate, a transmission gear and a shifting wheel, the output gear is connected with an output shaft of the motor, the output gear is meshed with the transmission gear, the transmission gear and the shifting wheel are rotatably arranged on the mounting plate, a poking groove which penetrates through the poking wheel along the central axis direction of the poking wheel is arranged on the peripheral wall of the poking wheel, a poking rod part which penetrates through the mounting plate is arranged in the poking groove, the other end of the poking rod part is connected with a breaker opening and closing handle, the poking wheel drives the poking rod part to rotate in a reciprocating mode and drives the breaker opening and closing handle to perform opening and closing actions, the shifting wheel is provided with a shifting tooth smaller than half of the circumference, the shifting tooth is meshed with the transmission gear, and the angle of the circumference where the shifting tooth is located is larger than the rotating angle required by the opening and closing operation of the circuit breaker.
3. The miniature circuit breaker with electric switching on/off device as claimed in claim 2, wherein said expansion body is a housing comprising a sealed cavity, said transmission rod is a push rod piston, said housing has a push rod through hole on its top end face, said push rod piston is movably disposed in the push rod through hole, said push rod piston is hermetically connected with the housing, said sealed cavity is internally installed with a fluid medium, a phase change expanding substance and an isolation diaphragm, said isolation diaphragm is disposed between the fluid substance and the phase change expanding substance, one end of said push rod piston passes through the push rod through hole and is connected with the slide plate, and the other end of said push rod piston is inserted into the fluid medium.
4. A miniature circuit breaker having an electrical divide-shut brake device according to claim 3 wherein said first inductive switch and said second inductive switch are microswitches.
5. The miniature circuit breaker with electric switching on/off device as claimed in claim 4, wherein said plunger piston is provided with a protrusion, said first and second inductive switches are located on one side of the protrusion of the plunger piston, said expansion body pushes the plunger piston to move at a first temperature, the roller of the first inductive switch is compressed by the protrusion and feeds back the switching on locking signal, said expansion body pushes the plunger piston to move at a second temperature, and the roller of the second inductive switch is compressed by the protrusion and feeds back the switching on unlocking signal.
6. The miniature circuit breaker with electric switching on/off device of claim 5, wherein a sealing member is provided between said plunger piston and the housing, said sealing member being an O-ring, a gasket or a ring-shaped sealing sleeve.
7. A miniature circuit breaker having an electrically operated opening and closing device as set forth in claim 6, wherein said phase change expanding substance is paraffin and said fluid medium is liquid lubricating oil, grease or sealing grease.
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| CN201911200091.2A CN110931322B (en) | 2019-11-29 | 2019-11-29 | Miniature circuit breaker with electric switching-on and switching-off device |
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| CN201911200091.2A CN110931322B (en) | 2019-11-29 | 2019-11-29 | Miniature circuit breaker with electric switching-on and switching-off device |
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| CN110931322B CN110931322B (en) | 2022-11-22 |
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| CN110931322B (en) | 2022-11-22 |
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