33results about How to "Sufficient creepage distance" patented technology

The invention relates to an on-line temperature measuring method for the cable joints of a high voltage device; three temperature sensors are stuck on the surfaces of three metal conductive bodies; current induction coils are sheathed on the metal conductive bodies; a power circuit, microprocessors and wireless emitters are arranged on the metal conductive bodies and sealed in an insulator by circuit boards; the digital identifying codes of the three output ends of the measured cable joints are written in the microprocessors of each own; three metal conductive bodies sealed by insulating materials are respectively arranged at the three-phase output ends of the cable joints; each current induction coil after inducing that the currents are processed by the power circuit provides a working power for the temperature sensor, the microprocessor and the wireless emitter of each own; the microprocessors emit the monitored temperature signals and corresponding identifying codes by the wireless emitters; a wireless receiver receives the wireless electric signals of each circuit, demodulates the wireless electric signals into digital signals and transmits the digital signals to a display instrument; the display instrument receives and identifies three corresponding cable joints. The on-line temperature measuring method can instantly accurately monitor the temperature of the cable joints of the high voltage device on line.

A stator includes a stator core having slots, a stator coil comprised of three phase windings, phase busbars each electrically connecting a corresponding one of the phase windings to an inverter, and a neutral busbar star-connecting the phase windings to define a neutral point therebetween. In each of the slots of the stator core, there are arranged K in-slot portions of the phase windings of the stator coil in K layers so as to be radially aligned with each other, where K is an even number. The phase and neutral busbars are electrically connected with those in-slot portions of the phase windings of the stator coil which are arranged at the radially outermost layer or the radially innermost layer in the respective slots of the stator core so as to be circumferentially spaced from one another by M slot-pitches or more, where M is a slot multiplier number.

The present invention provides a semiconductor device which has a packaging structure of the improved packaging piece. The substrate packaging piece which is composed of a metal base for heat radiation, an insulation circuit board and a semiconductor chip is assembled with a peripheral resin casing. The L-shaped legs of the external terminals which are arranged on the surrounding wall of the peripheral resin casing are leaded to the inner side of the casing. A joint conducting wire is connected between the leg part and the conductor pattern of the insulation circuit board. In the semiconductor device with the structure, the peripheral resin casing is beforehand punched at the surrounding wall to form a plurality of terminal installing holes, and the necessary external terminals are installed in the terminal installing holes. Hereon, the terminal installing holes are designed and formed with a mode which can be corresponding with the arrangement of all device types and terminals with different standards. When the packaging piece is installed, the terminal installing holes which are selected according to the assigned standard are pressed with external terminals necessary for installation.

The invention relates to a miniature fixed metal-armored switchgear, which comprises an instrument box, a mechanism case, composite apparatuses, current transformers and a grounding switch. A cabinet body comprises an upper cabinet body unit and a lower cabinet body unit. The composite apparatuses are arranged on the upper cabinet body unit. Upper side plates on the upper cabinet body unit are provided with a busbar wall bushing respectively. Isolating switch fixed contacts are poured in corresponding pedestals and positioned on the inner side of a wall body. Three-phase isolating switch moving contacts of the composite apparatuses correspond to the three-phase isolating switch fixed contacts. Three current transformers are overlapped and arranged on the lower cabinet body unit. The grounding switch and an arrester are arranged in the lower cabinet body unit. The composite apparatuses and the three current transformers divide the cabinet body into an upper main cable chamber, a middle vacuum switch chamber and a lower switching cable chamber. The miniature fixed metal-armored switchgear has switching-on, isolating and grounding functions, remarkable isolating fractures and a compact structure, and is convenient to mount; and mounting efficiency can be improved, a cabinet body mounting space can be reduced and cabinet body manufacturing cost can be decreased.

A stator includes a stator core having slots arranged in a circumferential direction thereof at a predetermined pitch and a stator coil comprised of phase windings. Each of the phase windings is configured with an electric conductor and an insulating coat covering the electric conductor. Each of the phase windings includes in-slot portions and turn portions connecting the in-slot portions. The turn portions of the phase windings include a plurality of types of turn portions having different circumferential lengths. For each of the phase windings, apex parts of the turn portions of the phase winding are arranged in pairs over the entire circumferential range of the stator coil. The apex parts of each of the pairs axially overlap each other. Each circumferentially-adjacent pair of the apex parts of the turn portions of all the phase windings are circumferentially offset from each other by a distance greater than the predetermined pitch.

Obtained is a fire alarm system transmitter having an improved insulating property without increasing an entire size of a casing. The fire alarm system transmitter includes: a printed circuit board with a substantially rectangular shape, on which a terminal block including a plurality of terminals aligned along one side of the printed circuit board is disposed; a casing with a substantially rectangular parallelepiped shape, in which the printed circuit board is mounted; and an electric-wire insertion portion provided on a side wall of the casing facing the one side, and extended from the side wall by a predetermined distance toward an outside of the casing, the side wall allowing a plurality of electric wires connected to the plurality of terminals to be inserted through the side wall.

A stator includes a stator core having slots arranged in a circumferential direction thereof at a predetermined pitch and a stator coil comprised of phase windings. Each of the phase windings is configured with an electric conductor and an insulating coat covering the electric conductor. Each of the phase windings includes in-slot portions and turn portions connecting the in-slot portions. The turn portions of the phase windings include a plurality of types of turn portions having different circumferential lengths. For each of the phase windings, apex parts of the turn portions of the phase winding are arranged in pairs over the entire circumferential range of the stator coil. The apex parts of each of the pairs axially overlap each other. Each circumferentially-adjacent pair of the apex parts of the turn portions of all the phase windings are circumferentially offset from each other by a distance greater than the predetermined pitch.

The invention relates to the technical field of welding power supplies, in particular to a three-phase electricity over-voltage, under-voltage and default phase alarm circuit based on peak voltage detection. The alarm circuit comprises a first diode, an over-voltage detection circuit and a rapid-charge and slow-discharge logic comparison circuit, the first diode is connected with any phase of three-phase electricity, one path of an input end of the over-voltage detection circuit is connected with the first diode, the other path of the input end is connected to any phase of the other two phasesof the three-phase electricity, an output end of the over-voltage detection circuit is connected when the voltage exceeds a threshold value, the rapid-charge and slow-discharge logic comparison circuit is connected with an output end of the over-voltage detection circuit and comprises a rapid-charge and slow-discharge circuit and a first logic comparison circuit, an energy storage element of therapid-charge and slow-discharge circuit is charged to generate voltage higher than reference voltage when the output end of the over-voltage detection circuit is connected, the energy storage elementof the rapid-charge and slow-discharge circuit discharges and keeps voltage higher than the reference voltage when the output end of the over-voltage detection circuit is disconnected, an output end of the rapid-charge and slow-discharge circuit is connected with a comparator and compared with the reference voltage, and an output end of the comparator is connected with an alarm device.

The invention discloses a wiring module for a BIPV (building integrated photovoltaic) system, comprising a shell and a cover, wherein the shell is provided with at least one cavity; the cover is used for covering the opening of the at least one cavity; and side walls of the cover are coated on external surfaces of the side walls of the at least one cavity, and form at least one part of external wall of the shell. Compared with the prior art, in the embodiment of the invention, the side walls of the cover are coated on the external surfaces of the side walls of the cavity in stead of being inserted into the cavity and form the external wall of the shell, thus the cover does not occupy the space in the cavity, thus ensuring that an electrical equipment component in the cavity has a sufficient electric clearance and creep distance, thereby improving electric safety of an electrical component in the cavity; and in addition, the size of a wiring box is not required to increase.

Provided is an electric motor in which an imbalance in electromagnetic force is inhibited even when an abnormality has occurred in an electric power system. The motor (1) is connectable to a plurality of electric power systems (D1, D2) and includes: a stator (8) including a plurality of excitation magnetic poles (12) disposed in a circumferential direction and coils (U1, V1, W1 (U2, V2, W2)) provided on the respective poles (12), the coils including, for each of the systems (D1, D2), a set of three or more phase coils, the coils carrying respective currents of three or more phases of the corresponding system (D1, D2); and a rotor (9) rotatable relative to the stator (8). The coils (U1, V1, W1, U2, V2, W2) of the stator (8) are arranged such that coils adjacent to each other in the circumferential direction are different in phase and associated with different systems.

The invention relates to an overvoltage protection device, which comprises a shell,, a moving electrode and a fixed electrode, wherein a metal oxide voltage-dependent resistor which is arranged in the shell is provided with two opposite main body surfaces and four side surfaces, and the area of each main body surface is larger than the area of any side surface; one end of the moving electrode is installed on the shell; and one end of the fixed electrode is connected with the metal oxide voltage-dependent resistor and the other end of the fixed electrode is connected with the other end of the moving electrode through welding. The fixed electrode is arranged relative to the metal oxide voltage-dependent resistor and on the projection formed by the main body surface perpendicular to the metal oxide voltage-dependent resistor. One end of the fixed electrode which is connected with the moving electrode is arranged outside the main body surface. A welded part between the fixed electrode and the moving electrode is not adversely affected by the heating up of a metal oxide varistor (MOV).

A stator includes a stator core having slots, a stator coil comprised of three phase windings, phase busbars each electrically connecting a corresponding one of the phase windings to an inverter, and a neutral busbar star-connecting the phase windings to define a neutral point therebetween. In each of the slots of the stator core, there are arranged K in-slot portions of the phase windings of the stator coil in K layers so as to be radially aligned with each other, where K is an even number. The phase and neutral busbars are electrically connected with those in-slot portions of the phase windings of the stator coil which are arranged at the radially outermost layer or the radially innermost layer in the respective slots of the stator core so as to be circumferentially spaced from one another by M slot-pitches or more, where M is a slot multiplier number.

Structure of improved movable reed of electromagnetic relay is as following: there are two contact pieces, one lead out piece and a junction piece in the relay; located in middle of the two contact pieces, the junction piece connects the two contact pieces; the two contact pieces include two free ends, and another free end is located at low end of the lead out piece; though the junction piece, the two contact pieces are connected to upper end of the lead out piece. Thus, contact ends of movable reed are integrated with the lead out piece. Advantages are: omitting procedure for welding contact piece and lead out piece etc; eliminating cold joint and additional resistance caused by jointed parts; keeping enough creepage distance, and raising stability of driving part, acceptability of products etc.

An electrodeless discharge lamp apparatus is provided which is increased in heat dissipation, making it possible to adapt to an increase in output of the apparatus. The electrodeless discharge lamp apparatus comprises a bulb containing a discharge gas and a coupler accommodated in a cavity formed in the bulb for generating a high frequency electromagnetic field. The coupler has: an induction coil; a core inserted into the coil; a heat conductor for conducting heat generated from the coil and the core; and a bobbin made of resin which accommodates the core and the heat conductor therein, and which has the coil wound therearound. The bobbin is designed to be separated in a radial direction of the coil, so that it is possible to separately mold the respective parts of the bobbin. Thus, it is not necessary to form, in the bobbin, a draft angle which has been necessary in the prior art when molding a tubular-shaped bobbin, and it is possible to make the thickness of the bobbin thin and uniform, so that the proportion of the bobbin in the volume of the cavity can be reduced to increase the proportion of the heat conductor.

The invention relates to an on-line temperature measuring method for the cable joints of a high voltage device; three temperature sensors are stuck on the surfaces of three metal conductive bodies; current induction coils are sheathed on the metal conductive bodies; a power circuit, microprocessors and wireless emitters are arranged on the metal conductive bodies and sealed in an insulator by circuit boards; the digital identifying codes of the three output ends of the measured cable joints are written in the microprocessors of each own; three metal conductive bodies sealed by insulating materials are respectively arranged at the three-phase output ends of the cable joints; each current induction coil after inducing that the currents are processed by the power circuit provides a working power for the temperature sensor, the microprocessor and the wireless emitter of each own; the microprocessors emit the monitored temperature signals and corresponding identifying codes by the wirelessemitters; a wireless receiver receives the wireless electric signals of each circuit, demodulates the wireless electric signals into digital signals and transmits the digital signals to a display instrument; the display instrument receives and identifies three corresponding cable joints. The on-line temperature measuring method can instantly accurately monitor the temperature of the cable joints ofthe high voltage device on line.

Provided is a backlight unit capable of reducing luminance unevenness. The backlight unit includes a plurality of dot light sources and a light guide plate in which a predetermined side surface serves as a light incident surface for introducing light from the plurality of dot light sources. The plurality of dot light sources are classified into a first light source group and a second light source group. A mount point of the first light source group and a mount point of the second light source group are displaced from each other in a thickness direction of the light guide plate. A total luminance of the first light source group is higher than a total luminance of the second light source group.

The invention provides an LED (Light Emitting Diode) bulb. The LED bulb comprises a radiator, a ceramic substrate in contact with the radiator, and an LED light source fixed on the ceramic substrate, wherein the radiator is provided with a boss, the boss is provided with a first connection surface formed in connection with the ceramic substrate, the ceramic substate is provided with a second connection surface formed in connection with the boss, and the area of the first connection surface is smaller than that of the second connection surface.

The invention discloses an over-voltage protection device, comprising a shell, a metal oxide piezoresistor in the shell, a movable electrode and a static electrode, wherein one end of the movable electrode is installed on the shell, one end of the static electrode is connected with the metal oxide piezoresistor, the other end of the static electrode is connected with the other end of the movable electrode by soldering, and the end of the static electrode, connected with the movable electrode, and the movable electrode are soldered in an inclined angle manner so as to realize vertically crosswise soldering. The soldering manner provided by the invention is beneficial to overcoming of the defects of false soldering, air holes and the like caused by face-to-face soldering of the movable and static electrodes of traditional over-voltage protection devices.

The invention discloses an electric arc short circuit prevention electromagnetic relay, which comprises a base, a magnetic circuit part and a contact part, and is characterized in that the base is provided with a first accommodating cavity, a plurality of partition plates are arranged in the first accommodating cavity and divide the first accommodating cavity into a plurality of partition cavities, and the side surface of the first accommodating cavity is provided with a first opening leading to each partition cavity; the contact part comprises a plurality of contact units, each contact unit comprises a movable spring component and a static spring component which are arranged in the corresponding separation cavity, and an armature of the magnetic circuit part is matched with each movable spring component through a pushing card; the device further comprises a first flash barrier, the first flash barrier seals all or part of the first opening, a plurality of first baffles are arranged on the inner side face of the first flash barrier, at least one first baffle is laterally inserted into each partition cavity, and the first baffles are adjacent to or abut against the partition plates of the partition cavities to form at least two arc barrier walls located between the adjacent partition cavities. According to the invention, inter-phase arc short circuit caused by arc generated by breaking of the movable spring component and the static spring component can be avoided.

The invention relates to an overvoltage protection device, which comprises a shell,, a moving electrode and a fixed electrode, wherein a metal oxide voltage-dependent resistor which is arranged in the shell is provided with two opposite main body surfaces and four side surfaces, and the area of each main body surface is larger than the area of any side surface; one end of the moving electrode is installed on the shell; and one end of the fixed electrode is connected with the metal oxide voltage-dependent resistor and the other end of the fixed electrode is connected with the other end of the moving electrode through welding. The fixed electrode is arranged relative to the metal oxide voltage-dependent resistor and on the projection of the main body surface perpendicular to the metal oxide voltage-dependent resistor. One end of the fixed electrode which is connected with the moving electrode is arranged outside the main body surface. A welded part between the fixed electrode and the moving electrode is not adversely affected by the heating up of a metal oxide varistor (MOV).

A transformer includes a magnetic core having an inner space, a coil unit disposed within the magnetic core and including a primary coil and a secondary coil in which layers formed with conductive patterns are laminated, and a base configured to receive the magnetic core and the coil unit. A portion of the base is inserted into and disposed in the coil unit to be interposed between an output terminal coupled to the secondary coil and the magnetic core.

The invention discloses a printed circuit board installation seat, which comprises two side plates (10) arranged oppositely, and two end covers respectively connected to the two ends of the side plates (10) and positioning the side plates (10). (20), the upper inner side of the side plate (10) is provided with a chute (11) for installing the circuit board carrying the electronic module, and the lower inner side of the side plate (10) is provided with an installable bottom plate (30 ) guide slot (12), also includes two ends connected to the pull rod (40) on the two end covers (20) respectively, the bottom plate (30) includes a plurality of plates (32), in each plate (32) The bottom surface is provided with ears (33), and the pull rods (40) pass through the ears (33) of each plate (32) in turn. The present invention has a stable structure and higher strength. When the distance is sufficient, the heat dissipation performance is also improved.

The present invention provides a semiconductor device which has a packaging structure of the improved packaging piece. The substrate packaging piece which is composed of a metal base for heat radiation, an insulation circuit board and a semiconductor chip is assembled with a peripheral resin casing. The L-shaped legs of the external terminals which are arranged on the surrounding wall of the peripheral resin casing are leaded to the inner side of the casing. A joint conducting wire is connected between the leg part and the conductor pattern of the insulation circuit board. In the semiconductor device with the structure, the peripheral resin casing is beforehand punched at the surrounding wall to form a plurality of terminal installing holes, and the necessary external terminals are installed in the terminal installing holes. Hereon, the terminal installing holes are designed and formed with a mode which can be corresponding with the arrangement of all device types and terminals with different standards. When the packaging piece is installed, the terminal installing holes which are selected according to the assigned standard are pressed with external terminals necessary for installation.

The invention relates to the technical field of submarine communication, and provides a submarine optical cable splitter supporting an electric switching function. The splitter comprises a BU body and high-voltage switching units arranged at two ends of the BU body. The BU body comprises a first semi-cylindrical base and a second semi-cylindrical base; one side of the first semi-cylindrical base is rotatably connected with an optical module, and a single plate is attached to the bottom; the high-voltage switching unit comprises a relay, a mounting base, an elastic insulating pad and a protective cover; and the relay is arranged on the mounting base and is connected with the single plate in the BU body through a high-voltage line, and the elastic insulating pad is arranged between the relay and the protective cover. In the actual application process, the two high-voltage switching units are located at the two ends of the BU body respectively, on one hand, the enough high-voltage insulation creepage distance is guaranteed, on the other hand, the unit space in the BU body is saved, and the high-voltage switching function in the BU body is executed through relays in the high-voltage switching units.

The invention discloses an over-voltage protection device, comprising a shell, a metal oxide piezoresistor in the shell, a movable electrode and a static electrode, wherein one end of the movable electrode is installed on the shell, one end of the static electrode is connected with the metal oxide piezoresistor, the other end of the static electrode is connected with the other end of the movable electrode by soldering, and the end of the static electrode, connected with the movable electrode, and the movable electrode are soldered in an inclined angle manner so as to realize vertically crosswise soldering. The soldering manner provided by the invention is beneficial to overcoming of the defects of false soldering, air holes and the like caused by face-to-face soldering of the movable and static electrodes of traditional over-voltage protection devices.