CN113097025B - Leakage protector for power supply converter - Google Patents

Leakage protector for power supply converter Download PDF

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Publication number
CN113097025B
CN113097025B CN202110377807.7A CN202110377807A CN113097025B CN 113097025 B CN113097025 B CN 113097025B CN 202110377807 A CN202110377807 A CN 202110377807A CN 113097025 B CN113097025 B CN 113097025B
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China
Prior art keywords
contact
base
fixed contact
push rod
cavity
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CN202110377807.7A
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Chinese (zh)
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CN113097025A (en
Inventor
马文斌
刘建花
杨兰玉
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Changshu Institute of Technology
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Changshu Institute of Technology
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Priority to CN202110377807.7A priority Critical patent/CN113097025B/en
Publication of CN113097025A publication Critical patent/CN113097025A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/04—Contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H7/00—Devices for introducing a predetermined time delay between the initiation of the switching operation and the opening or closing of the contacts
    • H01H7/08—Devices for introducing a predetermined time delay between the initiation of the switching operation and the opening or closing of the contacts with timing by mechanical speed-control devices
    • H01H7/10—Devices for introducing a predetermined time delay between the initiation of the switching operation and the opening or closing of the contacts with timing by mechanical speed-control devices by escapement
    • H01H7/12—Devices for introducing a predetermined time delay between the initiation of the switching operation and the opening or closing of the contacts with timing by mechanical speed-control devices by escapement mechanical
    • 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
    • H01H71/08—Terminals; Connections
    • 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
    • H01H71/123—Automatic release mechanisms with or without manual release using a solid-state trip unit
    • H01H71/125—Automatic release mechanisms with or without manual release using a solid-state trip unit characterised by sensing elements, e.g. current transformers
    • 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
    • H01H71/128—Manual release or trip mechanisms, e.g. for test purposes
    • 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
    • H01H71/24—Electromagnetic mechanisms
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Switch Cases, Indication, And Locking (AREA)

Abstract

A power converter leakage protection device comprises a base; a base supported within the base cavity; the circuit board is fixed with the base at a position corresponding to the upper part of the base, and the push rod actuating mechanism is arranged at the left end of the base cavity and extends into the push rod actuating mechanism abdicating cavity; the upper cover is fixed with the base, a reset button and a test button are arranged on the upper cover, the reset button corresponds to the top of the push rod, the test button corresponds to a test button switch on the circuit board, and a push rod return spring is sleeved on the push rod; the moving contact mechanism comprises a first moving contact, a second moving contact, a first wire outlet terminal and a second wire outlet terminal; the static contact mechanism comprises a first static contact and a second static contact; and the cross arm frame is arranged in the base cavity at a position corresponding to the right side of the push rod actuating mechanism, and when the electric leakage condition occurs, the circuit board responds to the induced current generated by the zero-sequence current transformer and enables the push rod actuating mechanism to be electrified to act. The structure is simplified; the manufacture and the assembly are convenient; no jamming or the like occurs.

Description

Leakage protector for power supply converter
Technical Field
The invention belongs to the technical field of low-voltage electrical safety devices, and particularly relates to a power converter leakage protection device.
Background
A typical example of the above-mentioned power converter is a power supply terminal board (also referred to as "power supply terminal board"). As known in the art, in order to ensure the safety of electricity utilization, various earth leakage protection devices are usually provided on the power converter, i.e. the power strip, such as "a waterproof earth leakage protection plug" recommended by CN203326256U, "an earth leakage protection plug capable of switching between three poles and two poles" provided by CN103887660B, "an earth leakage protection device capable of being tripped forcibly" introduced by CN104934926A, and "an earth leakage protection device structure suitable for automatic assembly" disclosed by CN106057591a, etc. The leakage protection mechanism is arranged in the power supply extension board, namely is arranged in a shell of the power supply extension board, and has the function of leakage protection on electric appliances which are plugged and matched with the power supply extension board through a plug, such as CN201369305Y (a leakage protection structure), CN203103249U (a leakage protection socket tripping device) and CN203721662U (a tripping device structure used in a leakage protector), and the like.
From a reading of the above patent documents, in combination with common general knowledge: the earth leakage protection plug has the characteristic of strong pertinence, the earth leakage protection socket can protect a plurality of electrical appliances which are inserted and matched with the earth leakage protection socket, and as long as the earth leakage protection socket cuts off the circuit due to earth leakage, the power supply of all the electrical appliances which are inserted and matched with the earth leakage protection socket through the plug is cut off. The leakage protection device has the following functions: under normal conditions, current flows from a live wire to a zero line to form a loop, the ground wire has no current, the currents of the live wire and the zero line are equal, and magnetic fields generated by the two equal currents are mutually offset on a zero sequence current transformer of a structural system of the leakage protection device, so that no induced current is generated by a secondary coil of the zero sequence current transformer; when the electric leakage occurs, part of current flows away through the ground wire, so that the current of the live wire is larger than that of the zero line, the secondary coil of the zero sequence current transformer generates induction current, the current responds quickly after passing through an amplifying circuit of the circuit board and cuts off the power supply, and the purpose of preventing electric shock is achieved.
The "tripping mechanism of an electrical leakage breaker" recommended by chinese patent No. CN2528101Y can be disposed in an electrical component such as the aforementioned power strip in the category of power converters, and can objectively bring out the technical effects described in the technical effect column of the specification thereof, but has the following disadvantages: firstly, the push rod acts on the cross arm frame through the lock catch, namely the push rod does not directly act on the cross arm frame, so that the acting force transmission links are more, and the stability and the reliability of the action are influenced; secondly, because the pair of incoming line terminals and the pair of outgoing line terminals are respectively arranged at the two ends of the base, the volume of the base is increased, and the installation is relatively troublesome; thirdly, because the separation of the movable contact at the free ends of the pair of movable contacts and the fixed contact of the pair of fixed contacts is realized by the elasticity of the pair of movable contacts under the action of no external force, once the fatigue condition occurs due to the elasticity of the pair of movable contacts for a long time, the separation effect of the movable contact and the fixed contact is influenced, even the movable contact and the fixed contact can not be completely separated, thereby influencing the circuit breaking under the state of electric leakage and even causing safety accidents.
The "built-in leakage protection module" proposed by invention patent application publication No. CN106384702a remedies the above disadvantage of CN2528101Y and embodies the technical effect described in paragraph 0017 of the specification thereof in a reliable manner, but the CN106384702a still has the following disadvantages: firstly, because the first and second fixed contacts are respectively inserted and embedded on the first and second fixed contact fixing seats from top to bottom, when the first and second movable contacts of the first and second movable contacts are contacted with the first and second fixed contacts under the action of elastic force and move in the lower direction corresponding to the first and second movable contacts, the first and second fixed contacts have a tendency of breaking away from the first and second fixed contact fixing seats upwards, so that a pressing plate is required to be equipped, a pair of pressing plate cross arms are formed on the pressing plate, the pair of pressing plate cross arms respectively limit the first and second fixed contacts, and the first and second fixed contacts are prevented from being separated from the first and second fixed contact fixing seats, thereby increasing the complexity of the whole structure; secondly, the structure of the reset mechanism is unreasonable, for example, a pair of push rod hitching legs on the push rod is matched with a push rod hitching leg matching cavity on the cross arm frame, and the cross arm is also provided with a push rod matching cavity, so that the structure of the push rod and the structure of the cross arm frame are both complex; thirdly, the push rod is in sliding contact fit with the plane of the guide inclined plane of the push rod hitching leg in the process of entering the push rod hitching leg fit cavity, so that the resistance is relatively large.
In view of the above-mentioned prior art, there is still a need for improvement, for which the applicant has made an advantageous design, in the context of which the solution to be described below is made.
Disclosure of Invention
The invention aims to provide a power converter leakage protection device which is beneficial to reliably keeping a static contact on a static contact fixing seat without adding a pressing plate, so that the lasting effect of combining and separating a movable contact of a movable contact and a static contact of the static contact can be ensured, the structure can be simplified, the structure of a cross arm frame and a push rod can be simplified, the manufacture and the assembly can be facilitated, the friction force between the push rod and the cross arm frame can be obviously reduced, and the operation resistance when a reset button is pressed downwards can be reduced.
The task of the invention is achieved by a power converter leakage protection device, which comprises a base, a first switch and a second switch, wherein the base is provided with a base cavity; a base, which is supported in the base cavity, wherein a cross arm abdicating groove is respectively arranged at the right end of the front side wall of the base and the rear side wall of the base and at the corresponding positions, the space between the front side wall and the rear side wall of the base is a push rod actuating mechanism abdicating cavity, a horizontal wing plate is respectively arranged at one side of the front side wall of the base opposite to the rear side wall of the base and one side of the rear side wall of the base opposite to the front side wall of the base, a moving contact bending part embedded groove is formed between the left end wall of the horizontal wing plate and the left side wall of the base, a moving contact bending part fixed seat is formed at the right end of the horizontal wing plate, a transformer cavity is formed in the middle of one side of the base facing upwards, a transformer positioning column is formed at the middle position corresponding to the transformer cavity, a cross arm frame matching seat is formed at one side of the base facing upwards and at the position corresponding to the right side of the transformer positioning column, the cross arm frame matching seat is provided with a cross arm hook abdicating cavity, and the cross arm hook abdicating cavity penetrates from the upper part to the lower part and is communicated with the cross arm cavity of the base; the circuit board is fixed with the base at a position corresponding to the upper part of the base, the push rod actuating mechanism is arranged at the left end of the base cavity in a horizontal state and extends into the push rod actuating mechanism abdicating cavity, and the push rod actuating mechanism is electrically connected with the circuit board in a control way; the upper cover is fixed with the base at a position corresponding to the upper part of the circuit board, a reset button and a test button are arranged on the upper cover, the reset button corresponds to the top of the push rod, the test button corresponds to a test button switch on the circuit board, the push rod is arranged on the circuit board in a vertically moving manner, a push rod fixing seat is fixed at the upper part of the push rod and is fixed with the reset button, a push rod return spring is sleeved on the push rod, the upper end of the push rod return spring is supported on the push rod fixing seat, the lower end of the push rod is supported on the circuit board, an armature caulking groove is formed at the lower part of the push rod, and the armature caulking groove is matched with or disengaged from the push rod actuating mechanism; a moving contact mechanism, which comprises a first moving contact, a second moving contact, a first outgoing line terminal and a second outgoing line terminal, wherein the left end of the first moving contact is bent to form a first moving contact bending part, the first moving contact bending part is embedded in the moving contact bending part embedding groove between the left end wall of the horizontal wing plate on one side of the front side wall of the base opposite to the rear side wall of the base and the left side wall of the base, the right end of the first moving contact extends towards the direction of the fixed contact fixing seat at a position corresponding to the lower part of the horizontal wing plate on the front side wall of the base and is formed as a free end, a first moving contact is fixed on the upward side of the right end part of the first moving contact, the left end of the second moving contact is bent to form a second moving contact bending part, the second moving contact bending part is embedded in the moving contact bending part embedding groove between the left end wall of the horizontal wing plate on one side of the rear side wall of the base back to the front side wall of the base and the left side wall of the base, the right end of the second moving contact extends towards the direction of the fixed contact fixing seat at a position corresponding to the lower part of the horizontal wing plate on the rear side wall of the base and is formed as a free end, a second moving contact is fixed on the upward side of the right end part of the second moving contact, the first outgoing line terminal and the second outgoing line terminal are respectively embedded and fixed with a pair of outgoing line terminal caulking grooves formed on the left end of the upward side of the base in a front-back corresponding state, and the first outgoing line terminal is inserted into the embedded groove of the bending part of the moving contact at the position corresponding to the bending part of the first moving contact and is electrically connected with the bending part of the first moving contact, the second outgoing line terminal is inserted into the embedded groove of the bending part of the moving contact at the position corresponding to the bending part of the second moving contact and is electrically connected with the bending part of the second moving contact; the fixed contact mechanism comprises a first fixed contact and a second fixed contact, the first fixed contact is embedded on the fixed contact fixed seat at the right end of the horizontal wing plate at one side of the front side wall of the base, which is opposite to the rear side wall of the base, a first fixed contact is fixed on the lower surface of one end of the first fixed contact, which faces the first movable contact, at a position corresponding to the upper part of the first movable contact, the second fixed contact is embedded on the fixed contact fixed seat at the right end of the horizontal wing plate at one side of the rear side wall of the base, which is opposite to the front side wall of the base, and a second fixed contact is fixed on the lower surface of one end of the second fixed contact, which faces the second movable contact, at a position corresponding to the upper part of the second movable contact; the zero sequence current transformer is arranged in the transformer cavity, a transformer center hole is formed in the center of the zero sequence current transformer, the transformer center hole is sleeved on the transformer positioning column and is electrically connected with the circuit board, the first outgoing line terminal and the second outgoing line terminal are respectively connected with an outgoing line terminal connecting lead, and the outgoing line terminal connecting lead penetrates through the transformer center hole and is electrically connected with the circuit board; a cross arm frame, the cross arm frame is arranged in the base cavity at the position corresponding to the right side of the push rod actuating mechanism, the upper part of the cross arm frame is inserted into the cross arm frame hook head inserting cavity, the lower part of the cross arm frame is in sliding fit with the cross arm abdicating groove, the middle parts of the first moving contact and the second moving contact are arranged on the cross arm frame, a static contact wiring pin inserting hole is arranged on the static contact fixing seat, a first wiring pin is arranged at one end of the first static contact facing the first moving contact and at the position corresponding to the static contact wiring pin inserting hole, the first static contact is fixed with the static contact fixing seat by inserting the first static contact wiring pin into the static contact wiring pin inserting hole from bottom to top through the first static contact wiring pin under the state of being attached to the side surface of the static contact fixing seat facing downwards, a second fixed contact wiring pin is formed at a position corresponding to the static contact wiring pin embedding hole and facing one end of the second movable contact, the second fixed contact is embedded into the static contact wiring pin embedding hole from bottom to top through the second fixed contact wiring pin in a state of being attached to one side surface facing downwards of the fixed contact fixing seat and is fixed with the fixed contact fixing seat, a first movable contact supporting arm extends from the front side of the lower part of the cross arm frame, a second movable contact supporting arm extends from the rear side of the lower part of the cross arm frame, the first movable contact supporting arm is in sliding fit with the cross arm abdicating groove formed at the right end of the front side wall of the base, the second movable contact supporting arm is in sliding fit with the cross arm abdicating groove formed at the right end of the rear side wall of the base, a cross arm frame hook head extends from the upper part of the cross arm frame, the cross arm frame hook head extends into the cross arm frame hook head extending cavity, and the upper surface of the cross frame hook head forms an arc guide surface, the cross section of the hook head of the cross arm frame is in a fan shape due to the arc guide surface, a push rod flange is formed in the middle of the push rod, the armature caulking groove is matched with or separated from the push rod actuating mechanism in the cross arm frame cavity at the lower part of the cross arm frame, when the reset button is pressed downwards to enable the push rod to move downwards and move downwards to the extent that the push rod flange slides into the bottom of the hook head of the cross arm frame hook head along the arc guide surface, the connection relation of the push rod and the cross arm frame is established, and when the pressing of the reset button is released, the push rod and the cross arm frame are enabled to move upwards under the action of the restoring force of the push rod return spring, meanwhile, the free ends of the first moving contact and the second moving contact are driven by the first moving contact supporting arm and the second moving contact supporting arm to move upwards, the first moving contact is closed with the first static contact of the first static contact, meanwhile, the second movable contact is closed with the second fixed contact of the second fixed contact, the power circuit is connected, and the armature caulking groove at the lower part of the push rod is in a state of being matched with the push rod actuating mechanism in the cross arm frame cavity, when the electric leakage situation occurs, the circuit board responds to the induced current generated by the zero sequence current transformer and enables the push rod actuating mechanism to be electrified and act, the push rod actuating mechanism pulls the push rod at the position corresponding to the armature embedded groove of the push rod to enable the push rod flange to withdraw from the bottom of the hook head and return to the position above the hook head corresponding to the cross arm frame, the push rod is released from the connection relation with the cross arm frame and the matching relation with the push rod actuating mechanism, and the cross arm frame falls down, the first moving contact of the first moving contact is separated from the first fixed contact of the first fixed contact, and meanwhile, a second movable contact of the second movable contact is separated from a second fixed contact of the second fixed contact.
In a specific embodiment of the present invention, a base locking buckle is formed on each of the front outer wall and the rear outer wall of the base, the base locking buckle has a base locking buckle cavity, a base locking buckle mating flange is formed on each of the front outer wall and the rear outer wall of the upper cover and at a position corresponding to the base locking buckle, the base locking buckle mating flange is mated with the base locking buckle at a position corresponding to the base locking buckle cavity, and a pair of outlet terminal receding grooves are formed on the lower edge of the left end of the upper cover.
In another specific embodiment of the present invention, a base positioning pin extends from each of the four corners of the upward side of the base, a base positioning pin engaging notch is formed in each of the circuit board and the positions corresponding to the base positioning pins, and the base positioning pins engage with the base positioning pin engaging notches; a return spring seat is formed on one upward side of the circuit board and at a position corresponding to the transverse arm frame matching seat, the return spring seat is provided with a return spring seat cavity, the push rod return spring is supported in the return spring seat cavity, a positioning column tenon matching hole is formed in the circuit board and at a position corresponding to the mutual inductor positioning column, a mutual inductor positioning column tenon extends from the upper part of the mutual inductor positioning column, and the mutual inductor positioning column tenon is matched with the positioning column tenon matching hole in a mortise-tenon mode.
In yet another specific embodiment of the present invention, the plunger actuator includes a coil support, a coil, an iron core, an armature and an armature spring, the coil support is disposed at the left end of the base chamber in a horizontal state and extends into the plunger actuator abdicating chamber, a coil support hole penetrating from the left end to the right end of the coil support is formed at a central position in the length direction of the coil support, the coil is wound around the middle of the coil support and is electrically connected to the circuit board, the iron core is fixed to the coil support at a position corresponding to the left end of the coil support hole, the armature is movably disposed in the coil support hole corresponding to the right side of the iron core, and the armature corresponds to the cross arm chamber, the armature spring is sleeved at the left end of the armature, the left end of the armature spring is supported on the end face of the right end of the iron core, the right end of the armature spring is supported on the spring support step of the armature, and the armature groove at the lower portion of the plunger is fitted to the armature groove at a position corresponding to the right end of the armature.
In still another embodiment of the present invention, a test button fitting cavity, a reset button fitting cavity and a light guide sheet cavity are sequentially formed on the upper cover from left to right, a test button limit hook fitting cavity is formed in front of and behind the test button fitting cavity and at positions corresponding to each other, a first contact bridge pressing flange cavity is formed at a central position of the test button fitting cavity, the test button is fitted with the test button fitting cavity, a contact bridge pressing flange is formed at front and rear lower portions of the test button and at a position corresponding to the test button limit hook fitting cavity, a reset button limit foot groove is formed at front and rear sides of the reset button fitting cavity and at a position corresponding to each other, the reset button is fitted with the reset button fitting cavity, a reset button limit foot groove is formed at a front side and a rear side of the reset button fitting cavity and at a position corresponding to each other, and a light guide sheet is formed at a position corresponding to the reset button limit foot groove, and a light guide sheet is inserted into the reset button limit foot groove.
In a further specific embodiment of the present invention, a pair of outlet terminal limiting seats extend from an upper portion of a left side wall of the upper cover, an outlet terminal limiting boss is formed on each downward side of the pair of outlet terminal limiting seats, left ends of the first outlet terminal and the second outlet terminal extend to the left side of the upper cover at a position corresponding to the outlet terminal relief groove and a first outlet terminal limiting boss hole is formed in the first outlet terminal, a second outlet terminal limiting boss hole is formed in the second outlet terminal, the outlet terminal limiting boss on one of the pair of outlet terminal limiting seats is matched with the first outlet terminal limiting boss hole, and the outlet terminal limiting boss on the other of the pair of outlet terminal limiting seats is matched with the second outlet terminal limiting boss hole; the upper part of the right side wall of the upper cover extends to form a pair of static contact limiting seats, one downward side of each static contact limiting seat forms a static contact limiting boss, the right ends of the first static contact and the second static contact extend to the right side of the upper cover, the first static contact is provided with a first static contact limiting boss hole, the second static contact is provided with a second static contact limiting boss hole, the static contact limiting boss on one static contact limiting seat of the pair of static contact limiting seats is matched with the first static contact limiting boss hole, and the static contact limiting boss on the other static contact limiting seat of the pair of static contact limiting seats is matched with the second static contact limiting boss hole.
In a more specific embodiment of the present invention, a first conductive plate and a second conductive plate are disposed on the circuit board and at a position corresponding to the test button switch, the test button switch includes a contact bridge and a contact bridge spring, a second contact bridge pressing flange cavity is opened at a top of the contact bridge, a contact bridge front arm extends downward from a front side of the contact bridge, a contact bridge rear arm extends downward from a rear side of the contact bridge and at a position corresponding to the contact bridge front arm, the contact bridge front arm corresponds to a position above the first conductive plate, the contact bridge rear arm corresponds to a position above the second conductive plate, the contact bridge spring is located between the contact bridge front and rear arms, an upper end of the contact bridge spring is supported on a downward side of the contact bridge, a lower end of the contact bridge spring is supported on the circuit board, the contact bridge pressing flange of the test button protrudes into the second contact bridge pressing flange cavity, and when the test button is pressed downward, the contact bridge pressing flange forces the contact bridge to displace downward against an action of the contact bridge spring and when the contact bridge contacts the first conductive plate, the second conductive plate, the contact bridge pressing flange, and the contact bridge pressing flange, the contact bridge pressing against a counter force to simulate a current flowing through the first conductive plate.
In a further specific embodiment of the present invention, a varistor is disposed in the base cavity of the base and at the right end of the base cavity, and the varistor has two varistor connection pins, one of the two varistor connection pins is electrically connected to the first fixed contact connection pin of the first fixed contact, and the other of the two varistor connection pins is electrically connected to the second fixed contact connection pin of the second fixed contact.
In a still more specific embodiment of the present invention, right ends of the first and second fixed contacts are both configured in an n-shape, and left ends of the first and second outgoing terminals are both configured in an n-shape.
In yet another embodiment of the present invention, an upper cover mounting fixing seat is formed at a central position of the upper cover left side wall of the upper cover and at a central position of the upper cover right side wall of the upper cover.
One of the technical effects of the technical scheme provided by the invention is that a static contact wiring pin embedding hole is formed in a static contact fixing seat, a first static contact wiring pin is formed on a first static contact, the first static contact is embedded into the wiring pin embedding hole from bottom to top through the first static contact wiring pin and fixed with the static contact fixing seat in a state of being attached to one side surface facing downwards of the static contact fixing seat, and a second static contact has the same structure as the first static contact and is fixed with the static contact fixing seat in the same way, so that the first static contact and the second static contact can be reliably kept on the static contact fixing seat on the premise of not adding a pressing plate and the like in comparison with the prior art, the permanent combination effect of the first movable contact and the second movable contact with the first static contact of the first static contact and the second static contact is ensured, and the structure is remarkably simplified; secondly, the upper surface of the hook head of the cross arm frame extending to the upper part of the cross arm frame is formed into an arc guide surface, and the cross section of the hook head of the cross arm frame is in a fan shape by the arc guide surface, so that the structure of the cross arm frame is simplified, the structure of the push rod is simplified, and the manufacture and the assembly are facilitated; thirdly, because the push rod flange formed on the push rod is contacted with the arc guide surface through an arc surface, the friction force between the push rod and the cross arm frame hook head is favorably reduced remarkably, the reset button can be pressed downwards easily, and the situation of clamping stagnation and the like can not occur.
Drawings
FIG. 1 is a block diagram of an embodiment of the present invention.
Fig. 2 is a cross-sectional view of fig. 1.
Fig. 3 is a schematic view of the first and second movable contacts and the first and second fixed contacts shown in fig. 1 in a circuit connection state.
Fig. 4 is a schematic view of the first and second moving contacts and the first and second fixed contacts shown in fig. 1 in a circuit breaking state.
Detailed Description
In order to clearly understand the technical spirit and the advantages of the present invention, the applicant below describes in detail by way of example, but the description of the example is not intended to limit the technical scope of the present invention, and any equivalent changes made according to the present inventive concept, which are merely in form and not in material, should be considered as the technical scope of the present invention.
In the following description, all the concepts related to the directions or orientations of up, down, left, right, front and back are referred to the position state of 1, and thus, it should not be understood as a specific limitation to the technical solution provided by the present invention.
Referring to fig. 1 and 2, there is shown a base 1, the base 1 being moulded from plastics material and the base 1 having a base cavity 11; a base 2 is shown, which is molded from plastic, the base 2 is supported in the base cavity 11, a cross arm abdicating groove 23 is opened at the right end of the base front side wall 21 and the base rear side wall 22 of the base 2 and at the corresponding position, the cross arm abdicating groove 23 is n-shaped, the space between the lower parts of the base front and rear side walls 21, 22 is formed as a push rod actuator abdicating cavity 24a, a horizontal wing plate 25 is formed at the side of the base front side wall 21 opposite to the base rear side wall 22, i.e. at the front side of the base front side wall 21 and at the side of the base rear side wall 22 opposite to the base front side wall 21, i.e. at the rear side of the base rear side wall 22, as can be seen, there are a pair of horizontal wing plates 25, a moving contact embedding groove 251 is formed between the left end wall of the horizontal wing plate 25 and the base left side wall 26 of the base 2, the right end of the horizontal wing plate 25 is formed as a fixed contact 252, a transformer cavity 27 is formed at the middle of the side of the base 2 facing upward, a position corresponding to the base cavity 27, a mutual inductor holder 281 is formed at the corresponding to the right side of the base cavity, and a mutual inductor embedding head 281 is formed at the corresponding position, and a matching head 281 is connected to the upper part of the mutual inductor embedding head 28, and a mutual inductor embedding head 281 is formed at the matching top matching rack 281, and a matching head 28, and a matching head matching with the matching top matching rack 28, and a matching cross arm matching head 28, and a matching head matching the matching top of the matching cross arm matching cavity 11 is formed at the matching with the matching socket 11; a circuit board 3 and a push rod actuating mechanism 4 are shown, the circuit board 3 is fixed with the base 2 at a position corresponding to the upper part of the base 2, the push rod actuating mechanism 4 is arranged at the left end of the base cavity 11 in a horizontal state and extends into the push rod actuating mechanism abdicating cavity 24a, and the push rod actuating mechanism 4 is electrically connected with the circuit board 3 in a control way; an upper cover 5 and a push rod 6 are shown, the upper cover 5 is fixed with the base 1 at a position corresponding to the upper part of the circuit board 3, a reset button 51 and a test button 52 are arranged on the upper cover 5, the reset button 51 corresponds to the top of the push rod 6, the test button 52 corresponds to a test button switch 33 on the circuit board 3, the push rod 6 is arranged on the circuit board 3 in a vertically moving way, a push rod fixing seat 61 is fixed on the upper part of the push rod 6, the push rod fixing seat 61 is fixed with the reset button 51, a push rod return spring 62 is sleeved on the push rod 6, the upper end of the push rod return spring 62 is supported on the push rod fixing seat 61, the lower end is supported on the circuit board 3, an armature embedding groove 63 is arranged on the lower part of the push rod 6, and the armature embedding groove 63 is matched with or separated from the push rod actuating mechanism 4 (as will be explained below); a movable contact mechanism 7 is shown, the movable contact mechanism 7 includes a first movable contact 71, a second movable contact 72, a first outgoing line terminal 73 and a second outgoing line terminal 74, the left end of the first movable contact 71 is bent to form a first movable contact bending part 711, the first movable contact bending part 711 is embedded in the movable contact bending part embedding groove 251 between the left end wall of the horizontal wing plate 25 of the front side wall 21 of the base opposite to the rear side wall 22 of the base and the left side wall 26 of the base 2, the right end of the first movable contact 71 extends towards the fixed contact fixing seat 252 at the position corresponding to the lower part of the horizontal wing plate 25 on the front side wall 21 of the base and forms a free end, a first movable contact 712 is fixed at the upward side of the right end part of the first movable contact 71, the left end of the second movable contact 72 is bent to form a second movable contact bending part 721, the second movable contact bending part 721 is embedded in the movable contact bending part caulking groove 251 between the left end wall of the horizontal wing plate 25 on the side of the base rear side wall 22 opposite to the base front side wall 21 and the base left side wall 26 of the base 2, the right end of the second movable contact 72 extends toward the direction of the fixed contact terminal 252 at the position corresponding to the lower part of the horizontal wing plate 25 on the base rear side wall 22 and is formed as a free end, a second movable contact 722 is fixed on the upward side of the right end of the second movable contact 72, the first outgoing line terminal 73 and the second outgoing line terminal 74 are respectively and vertically embedded with the pair of outgoing line terminal caulking grooves 24b formed on the left end of the upward side of the base 2, and the first outgoing line terminal 73 is inserted into the movable contact bending part caulking groove 251 at the position corresponding to the first bending part 711 to be electrically connected with the first movable contact bending part 711, the second outgoing line terminal 74 is inserted into the moving contact bending part caulking groove 251 at a position corresponding to the second moving contact bending part 721 and is electrically connected with the second moving contact bending part 721; a fixed contact mechanism 8 is shown, the fixed contact mechanism 8 includes a first fixed contact 81 and a second fixed contact 82, the first fixed contact 81 is embedded in the fixed contact holder 252 at the right end of the horizontal wing 25 at the side of the front sidewall 21 opposite to the rear sidewall 22 of the base, a first fixed contact 811 is fixed on the lower surface of the first fixed contact 81 facing the left end of the first movable contact 71 and at a position corresponding to the upper side of the first movable contact 712, the second fixed contact 82 is embedded in the fixed contact holder 252 at the right end of the horizontal wing 25 at the side of the rear sidewall 22 opposite to the front sidewall 21 of the base, and a second fixed contact (not shown) is fixed on the lower surface of the second fixed contact facing the end of the second movable contact 72 and at a position corresponding to the upper side of the second movable contact 722; a zero sequence current transformer 10 is shown, the zero sequence current transformer 10 is disposed in the transformer cavity 27, a transformer center hole 101 is formed in a central position of the zero sequence current transformer 10, the transformer center hole 101 is sleeved on the transformer positioning post 271, the zero sequence current transformer 10 is electrically connected to the circuit board 3, an outlet terminal connecting lead 75 is respectively connected to the first outlet terminal 73 and the second outlet terminal 74, and the outlet terminal connecting lead 75 passes through the transformer center hole 101 to be electrically connected to the circuit board 3; a crossbar 9 is shown, the crossbar 9 being arranged in the aforesaid base cavity 11 in a position corresponding to the right side of the aforesaid push rod actuation mechanism 4, and the upper portion of the crossbar 9 extending into the aforesaid crossbar head extending cavity 281, while the lower portion thereof is in sliding engagement with the aforesaid crossbar relief groove 23, the aforesaid first and second movable contacts 71, 72 resting on the crossbar 9 in their middle portions.
As shown in fig. 1, the transformer positioning post 271 has a wire slot 2712, a wire connecting pin 32 is formed at the front side of the right end of the first outlet terminal 73, one end of the outlet terminal connecting wire 75 is connected to the wire connecting pin 732, and the other end thereof passes through the transformer center hole 101 at a position corresponding to the wire slot 2712 and is electrically connected to the circuit board 3. Since the second outlet terminal 74 has the same structure as the first outlet terminal 73, a wire connecting pin is also formed at the front side of the right end of the second outlet terminal 74, and one end of the outlet terminal connecting wire 75 is connected to the wire connecting pin and the other end is electrically connected to the circuit board 3 through the transformer center hole 101 at a position corresponding to the wire passing groove 2712. From the applicant's previous description, it can be confirmed without doubt that: two of the outlet terminal connecting wires 75 represent a live wire and a zero wire, respectively, if the first outlet terminal 73 is a live wire outlet terminal, the power inlet wire connected to the first stationary contact 81 is a live wire, the second outlet terminal 74 is a zero wire outlet terminal, and the power inlet wire connected to the second stationary contact 82 is a zero wire.
The technical key points of the technical scheme provided by the invention are as follows: a fixed contact wiring pin insertion hole 2521 is formed in the fixed contact holder 252, a first fixed contact wiring pin 812 is formed at a position corresponding to the fixed contact wiring pin insertion hole 2521 and at an end (i.e., the left end) of the first fixed contact 81 facing the first movable contact 71, the first fixed contact 81 is fixed to the fixed contact holder 252 by inserting the first fixed contact wiring pin 812 into the fixed contact wiring pin insertion hole 2521 from the bottom to the top in a state of being in contact with the surface of the side facing the lower side of the fixed contact holder 252, a second fixed contact wiring pin (not shown) is formed at an end (i.e., the left end) of the second fixed contact 82 facing the second movable contact 72 and at a position corresponding to the fixed contact wiring pin insertion hole 2521 and the second fixed contact 82 is fixed to the fixed contact holder 252 by inserting the second fixed contact wiring pin into the fixed contact wiring pin insertion hole 2521 from the bottom to the top in a state of being in contact with the surface of the side facing the lower side of the fixed contact holder 252, a first movable contact supporting arm 91 extends from the front side of the lower part of the cross arm frame 9, a second movable contact supporting arm 92 extends from the rear side of the lower part, the first movable contact supporting arm 91 is in sliding fit with the cross arm abdicating groove 23 formed at the right end of the front side wall 21 of the base, the second movable contact supporting arm 92 is in sliding fit with the cross arm abdicating groove 23 formed at the right end of the rear side wall 22 of the base, a cross arm frame hook 93 extends from the upper part of the cross arm frame 9, the cross arm frame hook 93 extends into the cross arm frame hook extending cavity 281, the upper surface of the cross arm frame hook 93 is an arc guide surface 931, the cross section of the cross arm frame hook 93 is shaped like a sector by the arc guide surface 931, a push rod flange 64 shaped like a U is formed at the middle part of the push rod 6, the armature slot 63 engages and disengages the push rod actuator 4 in a lower cross arm housing 94 of the cross arm 9 (described below).
Referring to fig. 3 and 4, when the reset button 51 is pressed downward to move the push rod 6 downward and downward to an extent that the push rod flange 64 slides into the hook bottom 932 of the cross arm hook 93 along the arc guiding surface 931, the connection relationship between the push rod 6 and the cross arm 9 is established, and when the press of the reset button 51 is released, that is, when the finger of the operator leaves the reset button 51, the push rod 6 and the cross arm 9 are displaced upward by the restoring force of the push rod return spring 62, and the free ends of the first and second movable contacts 71 and 72 are driven by the first and second movable contact supporting arms 91 and 92 to be displaced upward, the first movable contact 712 is closed with the first contact fixed portion 811 of the first fixed contact 81, the second movable contact 722 is closed with the second contact fixed portion of the second fixed contact 82, the power circuit is connected, and the armature engaging groove 63 of the lower portion of the push rod 6 is engaged with the push rod actuating mechanism 4 in the cross arm 94, and fig. 3 shows a schematic view; when a current leakage occurs, the circuit board 3 responds to the induced current generated by the zero sequence current transformer 10 and energizes the push rod actuator 4 to actuate, the push rod actuator 4 pulls the push rod 6 at a position corresponding to the armature recessed slot 63 of the push rod 6 to withdraw the push rod flange 64 from the hook head bottom 932 and return the push rod flange 64 to a position above the crossbar bracket hook head 93 along with the upward movement of the push rod 6 under the restoring force of the push rod return spring 62, the push rod 6 releases the connection with the crossbar bracket 9 and releases the fit with the push rod actuator 4, the crossbar bracket 9 falls, the first movable contact 712 of the first movable contact 71 is separated from the first fixed contact 811 of the first fixed contact 81, and the second movable contact 722 of the second movable contact 72 is separated from the second fixed contact of the second fixed contact 82, so that the power circuit is disconnected, which is specifically illustrated in fig. 4.
Referring to fig. 1, a base locking buckle 12 is formed on each of the front outer wall and the rear outer wall of the base 1, the base locking buckle 12 has a base locking buckle cavity 121, a base locking buckle mating flange 53 is formed on each of the front outer wall and the rear outer wall of the upper cover 5 at a position corresponding to the base locking buckle 12, the base locking buckle mating flange 53 is mated with the base locking buckle 12 at a position corresponding to the base locking buckle cavity 121, and a pair of outlet terminal relief grooves 54a are formed on the lower edge of the left end of the upper cover 5. In order to secure the fixing effect of the base 1 and the upper cover 5, they are fixed by the base fixing screws 15 and the upper cover fixing screw holes 54c preset on the upper cover 5 at positions corresponding to the base fixing screw holes 14 preset on the base 1.
A base positioning pin 24c extends from each of the four corners of the upward side of the base 2, a base positioning pin fitting notch 31 is formed in the circuit board 3 at a position corresponding to the base positioning pin 24c, and the base positioning pin 24c is fitted with the base positioning pin fitting notch 31; a return spring seat 32 is formed on the upward side of the circuit board 3 at a position corresponding to the crossbar frame fitting seat 28, the return spring seat 32 has a return spring seat cavity 321, the push rod return spring 62 is supported in the return spring seat cavity 321, a positioning post tenon fitting hole 34 is formed on the circuit board 3 at a position corresponding to the transformer positioning post 271, a transformer positioning post tenon 2711 extends from the upper portion of the transformer positioning post 271, and the transformer positioning post tenon 2711 is in mortise fit with the positioning post tenon fitting hole 34.
Continuing to refer to fig. 1, the push rod actuator 4 includes a coil support 41, a coil 42, an iron core 43, an armature 44 and an armature spring 45, the coil support 41 is disposed at the left end of the base chamber 11 in a horizontal state and extends into the push rod actuator relief chamber 24a, a coil support hole 411 passing through from the left end to the right end of the coil support 41 is formed at a central position in the longitudinal direction of the coil support 41, the coil 42 is wound around the middle of the coil support 41 and both coil lead-out ends of the coil 42 are electrically connected to the circuit board 3, the iron core 43 is fixed to the coil support 41 at a position corresponding to the left end of the coil support hole 411, the armature 44 is movably disposed in the coil support hole 411 corresponding to the right side of the iron core 43, and the armature 44 corresponds to the frame chamber 94 of the cross arm frame 9, the armature spring 45 is disposed at the left end of the armature 44, the left end of the armature spring 45 is supported on the right end of the iron core 43, the right end of the armature spring 45 is supported on the spring support step 441 of the armature 44, and the armature spring 45 is disengaged from the right end of the slot 442 corresponding to the armature groove 442 of the armature 44.
Since the two outlet terminal connecting wires 75 electrically connected to the first and second outlet terminals 73 and 74, respectively, are electrically connected to the circuit board 3 after passing through the center hole 101 of the transformer, the current normally flows from the live wire to the neutral wire to form a loop. The ground wire has no current, the currents of the live wire and the zero wire are equal, and the magnetic fields generated by the two equal currents cancel each other on the zero sequence current transformer 10, so that no induced current is generated by the secondary coil of the zero sequence current transformer. However, when a leakage occurs, a part of the current flows through the ground wire, which causes the current of the live wire to be larger than that of the neutral wire, so that an induced current is generated in the secondary coil of the zero-sequence current transformer, and the induced current is amplified by the amplifying circuit of the circuit board 3, and then the secondary coil responds to the amplified current, specifically, the push rod actuator 4 is energized to operate, and the armature 44 is displaced (sucked) to the left (in the illustrated position state as an example) by the iron core 43 against the reactive force of the armature spring 45, and since the armature insertion groove 63 of the lower portion of the push rod 6 is engaged with the armature 44 at a position corresponding to the armature groove 442 of the armature 44, the lower portion of the push rod 6 is pulled to the left when the armature 44 is displaced to the left, and the push rod flange 64 previously at the hook base 932 is separated from the hook base 932 to correspond to the upper side of the cross arm frame hook 93, and the first and the second movable contacts 71 and 72 are separated from the first and second movable contacts 81 and 82, as described above by the applicant, and the power supply circuit is cut off. When the power circuit is to be switched on again, then the reset button 51 is operated as described above by the applicant.
Continuing with fig. 1, a test button fitting cavity 55, a reset button fitting cavity 56 and a light guide sheet cavity 57 are formed in the upper cover 5 in sequence from left to right, a test button limit hook fitting cavity 551 is formed in front of and behind the test button fitting cavity 55 and in positions corresponding to each other, a first contact bridge pressing flange cavity 552 is formed in a central position of the test button fitting cavity 55, the test button 52 is fitted to the test button fitting cavity 55, a contact bridge pressing flange 522 is formed in front and rear lower portions of the test button 52 and in a position corresponding to the test button limit hook fitting cavity 551, the contact bridge pressing flange 522 is fitted to the test button switch 33, a reset button foot groove 561 is formed in front and rear sides of the reset button fitting cavity 56 and in positions corresponding to each other, the reset button pressing flange 522 is fitted to the test button switch 33, a reset button foot groove 561 is formed in front and rear sides of the reset button fitting cavity 56 and in front and rear sides of the reset button fitting cavity 56, a light guide sheet cavity 511 is provided with a reset button limiting groove 561 corresponding to the reset button fitting cavity 511, and a light guide sheet guiding groove 511 is provided in place of the reset button fitting light guide sheet 35, and a reset button limiting groove 511.
Continuing with fig. 1, a pair of outlet terminal defining seats 58 extend from the upper portion of the left side wall of the upper cover 5, an outlet terminal defining boss 581 is formed on the downward side of each of the outlet terminal defining seats 58, the left ends of the first outlet terminal 73 and the second outlet terminal 74 extend to the left side of the upper cover 5 at a position corresponding to the outlet terminal relief groove 54a and a first outlet terminal defining boss hole 731 is formed in the first outlet terminal 73, a second outlet terminal defining boss hole 741 is formed in the second outlet terminal 74, the outlet terminal defining boss 581 on one of the outlet terminal defining seats 58 is matched with the first outlet terminal defining boss hole 731, and the outlet terminal defining boss 581 on the other of the outlet terminal defining seats 58 is matched with the second outlet terminal defining boss hole 741; a pair of fixed contact limiting seats 59 extends from the upper portion of the right sidewall of the upper cover 5, a fixed contact limiting boss 591 is formed on each downward side of the pair of fixed contact limiting seats 59, the right ends of the first fixed contact 81 and the second fixed contact 82 extend to the right side of the upper cover 5, a first fixed contact limiting boss hole 813 is formed on the first fixed contact 81, a second fixed contact limiting boss hole 821 is formed on the second fixed contact 82, the fixed contact limiting boss 591 on one of the pair of fixed contact limiting seats 59 is matched with the first fixed contact limiting boss hole 813, and the fixed contact limiting boss 591 on the other one of the pair of fixed contact limiting seats 59 is matched with the second fixed contact limiting boss hole 821.
Continuing with fig. 1, a first conductive plate 36a and a second conductive plate 36b are disposed on the circuit board 3 and at a position corresponding to the test button switch 33, the test button switch 33 includes a contact bridge 331 and a contact bridge spring 332, a second contact bridge pressing flange cavity 3311 is opened at the top of the contact bridge 331, a contact bridge front arm 3312 extends downward from the front side of the contact bridge 331, a contact bridge rear arm 3313 extends downward from the rear side of the contact bridge 331 and at a position corresponding to the contact bridge front arm 2, the contact bridge front arm 3312 corresponds to the top of the first conductive plate 36a, the contact bridge rear arm 3313 corresponds to the top of the second conductive plate 36b, the contact bridge spring 332 is located between the contact bridge front and rear arms 3312, the contact bridge spring 332 has an upper end supported on the side of the contact bridge 331 facing downward, and a lower end supported on the circuit board 3, the contact bridge pressing flange 522 of the test button 52 protrudes into the second contact bridge pressing flange 3312, the contact bridge pressing flange 3312 presses the contact bridge 522 downward against the contact bridge 36a, the contact bridge 36b to simulate a displacement of the contact bridge 36b and the contact bridge 36b when the contact bridge 36b is pressed downward by the contact bridge 36 b. The push rod actuator 4 is energized to operate, and the power supply circuit is disconnected as described above.
A varistor 13 is disposed in the base cavity 11 of the base 1 and at the right end of the base cavity 11, the varistor 13 has two varistor connection pins, one of the two varistor connection pins is electrically connected to the first fixed contact connection pin 812 of the first fixed contact 81, and the other varistor connection pin is electrically connected to the second fixed contact connection pin of the second fixed contact 82. When the lightning strikes and the electric network has an instantaneous high voltage, the voltage dependent resistor 13 responds to conduct the circuit between the first and second fixed contacts 81 and 82 to form a short circuit, so as to play a role in protection.
As shown in fig. 1, the right ends of the first stationary contact 81 and the second stationary contact 82 are both n-shaped, the left ends of the first outlet terminal 73 and the second outlet terminal 74 are both n-shaped, and an upper cover mounting fixing seat 54b is formed at the center position of the left side wall of the upper cover 5 and at the center position of the right side wall of the upper cover 5.
Since the working principle of the present invention has been referred to in the above description and belongs to the prior art, for example, refer to CN102684148B (a leakage protection device with extended function) and CN106384702A (built-in leakage protection module), etc., so that the applicant does not need to describe the details again.
In conclusion, the technical scheme provided by the invention overcomes the defects in the prior art, successfully completes the invention task and truly realizes the technical effects of the applicant in the technical effect column.

Claims (10)

1. A leakage protection device for a power converter comprises a base (1), wherein the base (1) is provided with a base cavity (11); a base (2), the base (2) being supported in the base chamber (11), a cross arm abdicating groove (23) is respectively arranged at the right end of the front side wall (21) and the rear side wall (22) of the base (2) and at the corresponding position, the space between the front side wall and the rear side wall (21, 22) of the base is a push rod actuating mechanism abdicating cavity (24 a), a horizontal wing plate (25) is respectively formed on one side of the base front side wall (21) back to the base rear side wall (22) and one side of the base rear side wall (22) back to the base front side wall (21), a moving contact bending part caulking groove (251) is formed between the left end wall of the horizontal wing plate (25) and the left side wall (26) of the base (2), the right end of the horizontal wing plate (25) forms a static contact fixing seat (252), a mutual inductor cavity (27) is formed in the middle of one upward side of the base (2), a transformer positioning column (271) is formed at the central position corresponding to the transformer cavity (27), a cross arm frame matching seat (28) is formed on one side of the base (2) facing upwards and at the position corresponding to the right side of the transformer positioning column (271), the cross arm frame mating seat (28) is provided with a cross arm frame hook head probing cavity (281), the cross arm frame hook head probing cavity (281) penetrates from the upper part to the lower part and is communicated with the base cavity (11); the circuit board (3) is fixed with the base (2) at a position corresponding to the upper part of the base (2), the push rod actuating mechanism (4) is arranged at the left end of the base cavity (11) in a horizontal state and extends into the push rod actuating mechanism abdicating cavity (24 a), and the push rod actuating mechanism (4) is electrically connected with the circuit board (3) in a control way; the upper cover (5) is fixed with the base (1) at a position corresponding to the upper part of the circuit board (3), a reset button (51) and a test button (52) are arranged on the upper cover (5), the reset button (51) corresponds to the top of the push rod (6), the test button (52) corresponds to a test button switch (33) on the circuit board (3), the push rod (6) is arranged on the circuit board (3) in a vertically moving way, a push rod fixing seat (61) is fixed on the upper part of the push rod (6), the push rod fixing seat (61) is fixed with the reset button (51), a push rod return spring (62) is sleeved on the push rod (6), the upper end of the push rod return spring (62) is supported on the push rod fixing seat (61), the lower end of the push rod (6) is supported on the circuit board (3), an armature caulking groove (63) is formed in the lower part of the push rod (6), and the armature caulking groove (63) is matched with or disengaged from the push rod actuating mechanism (4); a moving contact mechanism (7), the moving contact mechanism (7) includes a first moving contact (71), a second moving contact (72), a first outgoing line terminal (73) and a second outgoing line terminal (74), the left end of the first moving contact (71) is bent to form a first moving contact bending part (711), the first moving contact bending part (711) is embedded into the moving contact bending part caulking groove (251) between the left end wall of the horizontal wing plate (25) at the side of the front side wall (21) of the base opposite to the rear side wall (22) of the base and the left side wall (26) of the base (2), the right end of the first moving contact (251 (71) extends towards the fixed contact fixed seat (252) at the position corresponding to the lower part of the horizontal wing plate (25) on the front side wall (21) of the base and forms a free end, a first moving contact (712) is fixed at the side of the right end of the first moving contact (71) facing the moving contact fixed bending part fixed side, the left end of the second moving contact (72) is bent to form a second bending part (721), the second moving contact bending part (721) is embedded into the horizontal wing plate (721) of the side wall (21) of the base opposite to the side wall (26) of the base opposite to the front side wall (21), the right end of the second moving contact (72) extends towards the direction of the fixed contact fixing seat (252) at a position corresponding to the lower part of the horizontal wing plate (25) on the rear side wall (22) of the base and is formed into a free end, a second moving contact (722) is fixed on one upward side of the end part of the right end of the second moving contact (72), a first outgoing line terminal (73) and a second outgoing line terminal (74) are respectively embedded and fixed with a pair of outgoing line terminal embedding grooves (24 b) formed at the left end of the upward side of the base (2) in a front-back corresponding state, the first outgoing line terminal (73) is embedded into the moving contact bending part embedding groove (251) at a position corresponding to the first moving contact bending part (711) to be electrically connected with the first moving contact bending part (711), and the second outgoing line terminal (74) is embedded into the moving contact bending part embedding groove (251) at a position corresponding to the second moving contact bending part (721) to be electrically connected with the second moving contact bending part (721); a fixed contact mechanism (8), the fixed contact mechanism (8) including a first fixed contact (81) and a second fixed contact (82), the first fixed contact (81) being embedded in the fixed contact holder (252) at the right end of the horizontal wing plate (25) on the side of the front base sidewall (21) opposite to the rear base sidewall (22), a first fixed contact (811) being fixed to the lower surface of the first fixed contact (81) facing the end of the first movable contact (71) and at a position corresponding to the upper side of the first movable contact (712), the second fixed contact (82) being embedded in the fixed contact holder (252) at the right end of the horizontal wing plate (25) on the side of the rear base sidewall (22) opposite to the front base sidewall (21), and a second fixed contact being fixed to the lower surface of the second fixed contact (82) facing the end of the second movable contact (72) and at a position corresponding to the upper side of the second movable contact (722); the zero sequence current transformer (10) is arranged in the transformer cavity (27), a transformer center hole (101) is formed in the center of the zero sequence current transformer (10), the transformer center hole (101) is sleeved on the transformer positioning column (271), the zero sequence current transformer (10) is electrically connected with the circuit board (3), the first outgoing line terminal (73) and the second outgoing line terminal (74) are respectively connected with an outgoing line terminal connecting lead (75), and the outgoing line terminal connecting lead (75) penetrates through the transformer center hole (101) to be electrically connected with the circuit board (3); a cross arm frame (9), the cross arm frame (9) is disposed in the base cavity (11) at a position corresponding to the right side of the push rod actuating mechanism (4), and the upper portion of the cross arm frame (9) extends into the cross arm frame hook head extending cavity (281), and the lower portion thereof is in sliding fit with the cross arm abdicating slot (23), and the middle portions of the first moving contact (71) and the second moving contact (72) are disposed on the cross arm frame (9), characterized in that a fixed contact wiring pin embedding hole (2521) is disposed on the fixed contact fixing seat (252), a first fixed contact wiring pin (812) is formed at a position corresponding to the fixed contact wiring pin embedding hole (2521) at one end of the first fixed contact (81) facing the first moving contact (71) and at a position corresponding to the fixed contact wiring pin embedding hole (2521), the first fixed contact (81) is embedded into the fixed contact wiring pin (2521) from the lower portion of the first fixed contact pin (812) to the upper portion of the fixed contact fixing seat (252) in a state where the fixed contact wiring pin (252) is embedded into the fixed contact wiring pin (2521), and the second fixed contact wiring pin is embedded into the second wiring pin (252), and the wiring pin (252) is formed at a state where the fixed contact pin embedding hole (2521) facing the fixed contact pin is formed at one end of the fixed contact pin (82) facing the fixed contact pin, and the second wiring pin embedding hole (82), and the fixed contact wiring pin is formed at a state where the fixed contact pin embedding hole (82) facing the fixed contact pin (82), and the fixed contact pin is formed at a second contact pin embedding hole (2521), and the fixed contact pin embedding hole (252), and the fixed contact pin embedding hole (82) facing the fixed contact pin A fixed seat (252) is fixed, a first movable contact supporting arm (91) extends from the front side of the lower part of the cross arm frame (9), a second movable contact supporting arm (92) extends from the rear side of the lower part, the first movable contact supporting arm (91) is in sliding fit with the cross arm abdicating groove (23) formed at the right end of the front side wall (21) of the base, the second movable contact supporting arm (92) is in sliding fit with the cross arm abdicating groove (23) formed at the right end of the rear side wall (22) of the base, a cross arm frame hook head (93) extends from the upper part of the cross arm frame (9), the cross arm frame hook head (93) extends into the cross arm frame hook head intrusion cavity (281) and the upper surface of the cross arm frame hook head (93) forms an arc guide surface (931), the cross section shape of the cross arm frame hook head (93) is in a fan shape by the arc guide surface (931), a push rod flange (64) is formed at the middle part of the push rod (6), the armature embedding groove (63) is in the arm frame cavity (94) of the cross arm frame (9) and is connected with the push rod (51) or the push rod (931) when the push rod (931) moves downwards along the guide surface (932) and the push rod (51) is released from the push rod (51) and the cross arm frame (51) and the push rod (51) is in the actuating mechanism, when the push button (51) is released from being pressed, the push rod (6) and the cross arm frame (9) are enabled to move upwards under the action of the restoring force of the push rod return spring (62), the free ends of the first and second moving contacts (71 and 72) are driven by the first and second moving contact support arms (91 and 92) to move upwards, the first moving contact (712) and the first fixed contact (811) of the first fixed contact (81) are closed, the second moving contact (722) and the second fixed contact of the second fixed contact (82) are closed, a power circuit is connected, the armature embedding groove (63) at the lower part of the push rod (6) is in a state matched with the push rod actuating mechanism (4) in the cross arm frame cavity (94), when the condition occurs, the circuit board (3) responds to the induced current generated by the zero sequence current transformer (10) and enables the push rod (4) to be electrified and act, the push rod actuating mechanism (4) is released from being matched with the cross arm frame cavity (63) corresponding to the position of the leakage current transformer (6), and the push rod actuating mechanism (4) is pulled out of the hook (93) and the hook (932) and the actuating mechanism (932) is pulled from the bottom of the push rod (6), the cross arm frame (9) falls, a first moving contact (712) of the first moving contact (71) is separated from a first fixed contact (811) of the first fixed contact (81), and a second moving contact (722) of the second moving contact (72) is separated from a second fixed contact of the second fixed contact (82).
2. The power converter leakage protection device of claim 1, wherein a base locking buckle (12) is formed on each of the front outer wall and the rear outer wall of the base (1), the base locking buckle (12) has a base locking buckle cavity (121), a base locking buckle mating flange (53) is formed on each of the front outer wall and the rear outer wall of the upper cover (5) and at a position corresponding to the base locking buckle (12), the base locking buckle mating flange (53) is mated with the base locking buckle (12) at a position corresponding to the base locking buckle cavity (121), and a pair of outlet terminal relief grooves (54 a) are formed at the lower left edge of the upper cover (5).
3. The power converter leakage protection device according to claim 1, wherein a base positioning pin (24 c) extends from each of four corners of an upward side of the base (2), a base positioning pin engaging notch (31) is formed in the circuit board (3) at a position corresponding to the base positioning pin (24 c), and the base positioning pin (24 c) is engaged with the base positioning pin engaging notch (31); a return spring seat (32) is formed on one upward side of the circuit board (3) and at a position corresponding to the cross arm frame matching seat (28), the return spring seat (32) is provided with a return spring seat cavity (321), the push rod return spring (62) is supported in the return spring seat cavity (321), a positioning column tenon matching hole (34) is formed in the circuit board (3) and at a position corresponding to the transformer positioning column (271), a transformer positioning column tenon (2711) extends from the upper portion of the transformer positioning column (271), and the transformer positioning column tenon (2711) is in mortise and tenon matching with the positioning column tenon matching hole (34).
4. The electrical leakage protection device of claim 1, wherein the plunger actuator (4) comprises a coil support (41), a coil (42), an iron core (43), an armature (44) and an armature spring (45), the coil support (41) is disposed at the left end of the base chamber (11) in a horizontal position and protrudes into the plunger actuator relief chamber (24 a), a coil support hole (411) penetrating from the left end to the right end of the coil support (41) is formed at a central position in the length direction of the coil support (41), the coil (42) is wound around the middle of the coil support (41) and is electrically connected to the circuit board (3), the iron core (43) is fixed to the coil support (41) at a position corresponding to the left end of the coil support hole (411), the armature (44) is disposed in the coil support hole (411) in a manner corresponding to the right side of the iron core (43), the armature (44) is disposed in the armature support hole (411) at a position corresponding to the left end of the coil support hole (41), the armature spring (44) is inserted in the armature support groove (63) at a position corresponding to the right end of the armature spring support hole (45), and the armature spring (44) is inserted in the left end of the armature support groove (63) of the armature spring support groove (43), and the armature spring support groove (45), the armature spring support groove (63) is formed at a position corresponding to the left end of the armature (43), and the armature spring support groove (43) at a position corresponding to the left end of the armature (63), and the armature spring support, the armature spring support The iron notch (442) is positioned to mate with and un-mate from the armature (44).
5. The leakage protector of power converter according to claim 1, wherein said upper cover (5) is provided with a test button mating cavity (55), a reset button mating cavity (56) and a light guide plate cavity (57) in sequence from left to right, a test button limit hook mating cavity (551) is provided in front and rear of the test button mating cavity (55) and at positions corresponding to each other, a first contact bridge pressing flange cavity (552) is provided at a central position of the test button mating cavity (55), said test button (52) is mated with the test button mating cavity (55), a test button limit hook (521) is provided at lower portions of front and rear sides of the test button (52) and at a position corresponding to the test button limit hook mating cavity (551) and is mated with the test button limit hook mating cavity (551), and a contact bridge pressing flange (522) is formed at the downward side of the top of the test button (52) and at the position corresponding to the first contact bridge pressing flange cavity (552), the contact bridge pressing flange (522) is matched with the test button switch (33), a reset button limiting foot groove (561) is respectively formed at the front side and the rear side of the reset button matching cavity (56) and at the position corresponding to each other, the reset button (51) is matched with the reset button matching cavity (56), and a reset button limiting foot groove (561) is respectively formed at the lower part of the front side and the rear side of the reset button (51) and at the position corresponding to the reset button limiting foot groove (561) The reset button limiting pin (511) is matched with the reset button limiting pin groove (561), a light guide sheet (35) is arranged on the circuit board (3) and at the position corresponding to the light guide sheet cavity (57), and the light guide sheet (35) extends into the light guide sheet cavity (57).
6. The earth leakage protection device of a power converter according to claim 2, wherein a pair of outlet terminal defining seats (58) extend from an upper portion of a left side wall of the upper cover (5), an outlet terminal defining boss (581) is formed on a downward side of each of the pair of outlet terminal defining seats (58), left ends of the first outlet terminal (73) and the second outlet terminal (74) extend to the left side of the upper cover (5) at a position corresponding to the outlet terminal relief groove (54 a) and a first outlet terminal defining boss hole (731) is formed in the first outlet terminal (73), a second outlet terminal defining boss hole (741) is formed in the second outlet terminal (74), the outlet terminal defining boss (581) located in one of the pair of outlet terminal defining seats (58) is fitted with the first outlet terminal defining boss hole (731), and the outlet terminal defining boss (741) located in the other one of the pair of outlet terminal defining seats (58) is fitted with the second outlet terminal defining boss hole (741); a pair of fixed contact limiting seats (59) extend from the upper portion of the right side wall of the upper cover (5), a fixed contact limiting boss (591) is formed on each downward side of the pair of fixed contact limiting seats (59), the right ends of the first fixed contact (81) and the second fixed contact (82) extend to the right side of the upper cover (5), a first fixed contact limiting boss hole (813) is formed in the first fixed contact (81), a second fixed contact limiting boss hole (821) is formed in the second fixed contact (82), the fixed contact limiting boss (591) on one of the pair of fixed contact limiting seats (59) is matched with the first fixed contact limiting boss hole (813), and the fixed contact limiting boss (591) on the other of the pair of fixed contact limiting seats (59) is matched with the second fixed contact limiting boss hole (821).
7. The leakage protection device of power converter as claimed in claim 5, wherein a first conductive plate (36 a) and a second conductive plate (36 b) are disposed on said circuit board (3) at a position corresponding to said test button switch (33), said test button switch (33) comprises a contact bridge (331) and a contact bridge spring (332), a second contact bridge pressing flange cavity (3311) is opened at the top of the contact bridge (331), a contact bridge front arm (3312) extends downward at the front side of the contact bridge (331), and a contact bridge rear arm (3313) extends downward at the rear side of the contact bridge (331) and at a position corresponding to the contact bridge front arm (3312), the contact bridge front arm (3312) corresponds to the upper part of the first conducting strip (36 a), the contact bridge rear arm (3313) corresponds to the upper part of the second conducting strip (36 b), the contact bridge spring (332) is positioned between the contact bridge front and rear arms (3312 ), the upper end of the contact bridge spring (332) is supported at one side of the contact bridge (331) facing downwards, the lower end of the contact bridge spring (332) is supported on the circuit board (3), the contact bridge pressing flange (522) of the test button (52) is inserted into the second contact bridge pressing flange cavity (3311), when the test button (52) is pressed downwards, the contact bridge pressing flange (522) forces the contact bridge (331) to act as a counter force for overcoming the counter force of the contact bridge spring (332) When the contact bridge front arm (3312) is contacted with the first conducting plate (36 a) and the contact bridge rear arm (3313) is contacted with the second conducting plate (36 b), the first conducting plate and the second conducting plate (36 a, 36 b) are conducted with each other to simulate a leakage current action.
8. The leakage protection device of a power converter according to claim 1, wherein a varistor (13) is disposed in the base cavity (11) of the base (1) and at the right end of the base cavity (11), the varistor (13) has two varistor connection pins, one of the two varistor connection pins is electrically connected to the first fixed contact connection pin (812) of the first fixed contact (81), and the other of the two varistor connection pins is electrically connected to the second fixed contact connection pin of the second fixed contact (82).
9. The leakage protection device of claim 1, wherein right ends of the first stationary contact (81) and the second stationary contact (82) are both n-shaped, and left ends of the first outlet terminal (73) and the second outlet terminal (74) are both n-shaped.
10. The power converter leakage protection device of claim 1, wherein an upper cover mounting seat (54 b) is formed at the central position of the left side wall of the upper cover (5) and at the central position of the right side wall of the upper cover (5).
CN202110377807.7A 2021-04-08 2021-04-08 Leakage protector for power supply converter Active CN113097025B (en)

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Application Number Priority Date Filing Date Title
CN202110377807.7A CN113097025B (en) 2021-04-08 2021-04-08 Leakage protector for power supply converter

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CN113097025B true CN113097025B (en) 2022-12-06

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN200965956Y (en) * 2006-10-23 2007-10-24 上海益而益电器制造有限公司 Electrical leakage protective power supply plug
CN202121173U (en) * 2011-07-26 2012-01-18 尹华 Anti-leakage plug
CN208142393U (en) * 2018-04-07 2018-11-23 佛山市顺德区信辉达电子有限公司 Three pole on-off leakage protecting plugs

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