CN110911253A

CN110911253A - Small-sized circuit breaker

Info

Publication number: CN110911253A
Application number: CN201911213763.3A
Authority: CN
Inventors: 赵静怡
Original assignee: 赵静怡
Current assignee: Yueqing Huazun Electric Co Ltd
Priority date: 2019-12-02
Filing date: 2019-12-02
Publication date: 2020-03-24
Anticipated expiration: 2039-12-02
Also published as: CN110911253B; CN112086328A; CN112086329A; CN112086328B; CN112086329B

Abstract

The invention discloses a miniature circuit breaker, which comprises a shell, a fusible core and a position adjusting block, wherein the shell comprises a shell, a shell lug and a binding post, the shell is a section of hollow cylinder, two groups of shell lugs and binding posts are respectively arranged on two end surfaces of the shell, the shell lugs are arranged inside the shell, the binding post is arranged outside the shell, and the shell lugs and the binding post penetrate through the wall surface of the shell to be connected; the fusible core sets up in the casing, and the fusible core is including setting up the core lug at both ends, and the core lug contacts with the shell body lug respectively, and the piece setting of adjusting the position is on the casing terminal surface, and the piece of adjusting the position is connected to the fusible core and controls it rotatory around the casing. The fusible core further comprises a core shell, a rotary column and a hot melt body, the cross section of the core shell along the axis of the shell is circular, two ends of the core shell are sealed, the hot melt body is filled in the core shell, four core lugs are arranged in the core shell, every two core lugs are respectively arranged at two ends of the core shell in a group, the core lugs at each end are respectively positioned at the upper part and the lower part of the end face, and the core lugs penetrate through the wall surface of the core shell and extend into the core shell.

Description

Small-sized circuit breaker

Technical Field

The invention relates to the field of circuit breakers, in particular to a miniature circuit breaker.

Background

A circuit breaker is an important component in an electrical circuit, and when an overcurrent fault occurs in the electrical circuit, the circuit breaker takes on the role of blowing out the electrical circuit. The circuit breaker is often set up in the circuit as the supplement of air switch, because air switch generally judges the short circuit of circuit, overflows the trouble through the electromagnetism mode, and in case some mechanical parts take place to become invalid, then the situation that can't break off the circuit in time appears, needs more reliable fuse-type circuit breaker to protect.

In the prior art, a circuit breaker or a fuse is disposable, most fuses are cylindrical metal bodies, after the fuse is fused, a new fusible core needs to be replaced, the fuse is troublesome, and when a standby fusible core is not configured in a use place, even if short circuit and overcurrent faults on a main circuit are timely eliminated on the spot, the circuit can be unobstructed by waiting for the new fusible core to be in place. Furthermore, the short-circuit fault in the circuit can only be repaired and identified through the rest of the electric auxiliary equipment, and the fuse is not equipped with an identification function, so that the danger of connecting the circuit without removing the fault can occur.

Disclosure of Invention

The invention aims to provide a miniature circuit breaker to solve the problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

a miniature circuit breaker comprises a shell, a fusible core and a position adjusting block, wherein the shell comprises a shell, a shell lug and a binding post, the shell is a section of hollow cylinder, two groups of shell lugs and binding posts are respectively arranged on two end faces of the shell, the shell lugs are arranged inside the shell, the binding post is arranged outside the shell, and the shell lugs and the binding post penetrate through the wall face of the shell to be connected; the fusible core sets up in the casing, and the fusible core is including setting up the core lug at both ends, and the core lug contacts with the shell body lug respectively, and the piece setting of adjusting the position is on the casing terminal surface, and the piece of adjusting the position is connected to the fusible core and controls it rotatory around the casing.

This circuit breaker establishes ties and sets up in the circuit, and two terminals are external joint, and it is inside shell lug, core lug, fusible core to be in proper order on the circuit path of two terminals, another core lug, another shell lug, another terminal, the effect of overload fusing is undertaken to fusible core inside wherein, and when the electric current was too big in the circuit, the metal route disconnection in the fusible core, cut on the main circuit, the circuit breaker effect is accomplished. The positioning block drives the fusible core to rotate so as to recycle the fusible core, the fusible component capable of being recycled is arranged in the fusible core, and after the fusible component at the upper part is fused, after a short-circuit fault on the main circuit is eliminated, the fusible component at the lower part is used for fusing in the next period to be executed after being turned upside down.

Further, the fusible core still includes core shell, column spinner and hot melt, and the cross-section of core shell along the casing axis is a waist circle, and core shell both ends are sealed, and the hot melt is filled to the core shell, and the core lug is four totally, and two liang of a set of sets respectively is at the core shell both ends, and each core lug of serving is located the upper and lower portion of terminal surface respectively, and the core lug passes in the core shell wall stretches into the core shell, and the apparent both ends of core shell set up the column spinner along the casing axis, and the column spinner is connected with the transmission of positioning block.

The invention uses the meltable and congealable metal body as the fusing component, i.e. the hot melt, the solid hot melt is positioned at the upper part at the beginning, the hot melt is connected with the core lugs positioned at the upper part at two sides, when the circuit current is larger, the upper hot melt for circuit connection starts to melt, the melted hot melt flows to the lower part of the core shell, the two core lugs positioned at the upper part are disconnected, the fusing process of the circuit breaker is realized, the hot melt flowing to the lower part is re-solidified after cooling and connects the two core lugs positioned at the lower part together, when the fault on the main circuit is eliminated from the outside, the fusible core only needs to be rotated to turn upside down, thereby being used as a new fusible core, after the current overload occurs in the period, the hot melt is melted and flows, flows to the lower space from the upper space of the core shell and is filled, the cycle is repeated, the purpose of recycling the fusible core is achieved. It should be noted that the core can only take the conductor role of the hot melt inside the fusible core, but not the conductor capacity of the core shell, so the core shell should be made of an insulator, such as a ceramic core shell or a high temperature resistant plastic core shell; the melting temperature of the hot melt has a certain requirement, in order to melt, the melting point cannot be too high, and the hot melt can not be melted and cut off by little heat, so the melting point needs to be higher than the room temperature to a certain degree, the melting points of pure metals in the existing materials are inquired, potassium (melting point 63 ℃), sodium (melting point 98 ℃), lithium (melting point 182 ℃) and tin (melting point 230 ℃) are four kinds of roughly available pure metals, the electrical conductivity does not need to be taken as the primary consideration condition, because the melting core resistance can be adjusted by designing different axial end surface areas of the core shell, the rest metal alloys and the like are various, the physical properties are different in different mixing ratios, and the examples cannot be given one by one, when a new material is used, a prototype test is carried out, and only the fusing effect of the invention can be obtained and the metal alloys flow to the lower part of the core shell.

Furthermore, the position adjusting block comprises a knob and a force transmission cylinder, a central hole is formed in the center of the end face of the shell, one end of the force transmission cylinder is provided with the knob, the other end of the force transmission cylinder penetrates through the central hole to be in transmission connection with the rotary column through a key or a spline, and the knob is located outside the shell.

After the force transmission cylinder is connected with the rotary column through keys or splines, the fusible core can be stirred to rotate through a knob positioned outside the shell, and because the rotation axis of the fusible core is the axis of the force transmission cylinder, the wire lugs of the four cores on the end surface of the core shell all use the axis of the force transmission cylinder as the rotation central line, thereby being respectively butted with the wire lugs of the shell at the same position to be electrically connected, and the wire lugs of the core can be in the shape of an arc sheet or a cylinder point, wherein the wire lugs are in the shape of an optimal circle, because the contact area is large, the connection is more sufficient.

As optimization, the position adjusting block further comprises two limiting columns, the limiting columns are arranged on the outer surface of the force transmission cylinder and extend radially, the difference between the limiting columns is one hundred eighty degrees, limiting grooves with one hundred eighty degrees difference are formed in the inner wall of the shell, a spring is arranged between the force transmission cylinder and the core shell, the spring is in a compressed state, and the limiting columns are embedded into the limiting grooves.

The fusible core only needs to be turned upside down without other angle positions, namely, only needs to be positioned at two angle positions, although the outer part can display the angle position of the fusible core by drawing scales on the outer surface of the shell, if the positioning block only has a rotary driving function, the invention can cause loose of the fusible core due to some vibration in the use occasion, the shell wiring piece is disconnected from the core wiring piece to cause circuit cut-off and influence normal use, therefore, the invention uses two spacing columns and two spacing grooves with one hundred eighty degrees of difference as the positioning structure, and can play a role of anti-loose after the positioning is finished, because the spring pushes the positioning block outwards, the spacing columns are embedded into the spacing grooves, under the condition that no external force overcomes the elastic force of the spring, the rotary position of the positioning block is locked, and the positioning block is in transmission connection with the fusible core, the unable rotation of positioning block, the fusible core also can't rotate to the rigidity, when the external needs upside down the fusible core, inwards promote a segment distance along the axial with the positioning block for spacing post deviates from the spacing groove, then the knob is dialled to the hand, loosens after rotatory one hundred eighty degrees, and spacing post falls back the spacing groove again, and the fusible core is accomplished and is locked upside down.

The two terminals also have a circuit connection in parallel relationship with the fusible core, and a resistor and an indicator light are arranged on the circuit connection.

When the short circuit exists on the main circuit to melt the fusible core, the indicator light is used for prompting whether the short circuit fault is eliminated, and the principle is as follows: the main circuit is short-circuited, the two binding posts are connected through the resistor and the indicator lamp, so that voltage on the main circuit is loaded at two ends of the resistor and the indicator lamp, the resistance value of the resistor is large, the current consumption is not high, a trace amount of current drives the constant of the indicator lamp to prompt that short-circuit faults existing in the main circuit are not eliminated at the moment, after the short-circuit faults are eliminated, a low-resistance path of the main circuit is disconnected, the resistor and the indicator lamp are in series connection with all loads on the main circuit, all voltages of the main circuit are not distributed, only is a proper current threshold value set for the indicator lamp to flash, and after the short circuit on the main circuit is eliminated, the indicator.

The rotation angle positioning of the fusible core can also be completed by another structure:

the shell lug is an elastic reed and is butterfly-shaped, the core lug is arc-shaped and is provided with a cylindrical core sheet at the center, and the arc of the core lug takes the central line of the shell as the axis.

When the rotary fusible core is about to reach the position, the shell lug plate serves as an elastic reed to provide insertion resistance, and when the rotary fusible core is completely in place, the cylindrical core piece is inserted into the butterfly center of the shell lug plate and locked, so that the hand feeling is obvious and the looseness is prevented.

Further, the two ends of the resistor and the whole indicator lamp are connected with a voltage sensor in parallel, a locking structure is arranged in the wall surface of the end part of the shell, the limiting column is clamped or opened by the locking structure, and a signal of the voltage sensor is transmitted to the locking structure.

The voltage sensor is used for identifying the voltage loaded at the two ends of the whole resistor and the indicating lamp, if the loaded voltage is the total voltage on the main circuit (the resistance value partial pressure of a main circuit wire is ignored), the short-circuit fault exists on the main circuit, the fusible core is not required to be reversed at the moment so that the short-circuit device is switched on again, although the indicating lamp indicates the fault, in order to prevent misoperation, a protective measure is additionally arranged to prevent the circuit breaker from being switched on again when the fault is not eliminated, the signal of the voltage sensor is used as a driving signal, and a locking structure is arranged in the wall surface of the end part of the shell to lock the limiting column so as to prevent the limiting column from being separated from. The locking structure can be a telescopic rod and a limiting column, jacks are formed in the limiting column, the telescopic rod extends into the limiting groove and inserts into the jacks in the limiting column, so that the locking purpose is achieved, the locking structure is provided with a lifting separation blade, the separation blade covers the limiting groove after descending, and the limiting column cannot be separated from the limiting groove.

Preferably, the hot melt is sodium metal. The circuit breaker comprises potassium (with a melting point of 63 ℃), sodium (with a melting point of 98 ℃), lithium (with a melting point of 182 ℃), and tin (with a melting point of 230 ℃), wherein the melting point of the potassium is only higher than the room temperature of forty degrees, and the circuit breaker can easily reach the melting temperature when used in hot summer and high-temperature environments, so that the current which can be passed through the circuit breaker is small, and the lithium and the tin are too much higher than the room temperature and can be fused by large current, thereby being suitable for a large-current circuit breaker. Sodium is most suitable.

Compared with the prior art, the invention has the beneficial effects that: according to the invention, metal with a melting point higher than room temperature to a certain extent is used as the fusing part, the core shell is used for constructing a closed space, and the upper and lower groups of lugs are arranged on two sides of the space, so that after the fusing part is fused due to overcurrent, a hot melt can be condensed again at the bottom in the core shell, and after the fault of a main circuit is eliminated from the outside, the fusing core can be turned over through the positioning block, so that the fusing part has a fusing function again, and the purpose of recycling is achieved; after the limiting column and the limiting groove are combined for use, the effects of positioning and locking the fusible core can be achieved, the fusible core is allowed to rotate only when a manager performs reset operation, and the fusible core is prevented from loosening and fixed in the rest of time; the resistor, the indicator light and the voltage sensor are used for judging whether the short-circuit fault on the main circuit is eliminated or not from the outside and locking the fusible core to prevent the fusible core from rotating and resetting in an unapproved state.

Drawings

In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an external view of a fusible core in accordance with the present invention;

FIG. 3 is view A-A of FIG. 2;

FIG. 4 is a schematic diagram of the indexing operation of the fusible core and the indexing block of the present invention;

FIG. 5 is a schematic view of the positioning of the position-limiting groove and the position-limiting post according to the present invention;

FIG. 6 is a schematic view of the positioning of the lugs of the shell and core of the present invention;

FIG. 7 is a circuit diagram of the location of resistors, indicator lights and voltage sensors according to the present invention.

In the figure: 1-shell, 11-shell, 111-central hole, 112-limiting groove, 12-shell lug, 13-lug, 2-fusible core, 21-core shell, 211-cavity ridge, 22-core lug, 221-core sheet, 23-rotary column, 24-hot melt, 3-positioning block, 31-knob, 32-force transmission cylinder, 33-limiting column, 4-spring, 51-resistor, 52-indicator light and 53-voltage sensor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, a miniature circuit breaker comprises a shell 1, a fusible core 2 and a positioning block 3, wherein the shell 1 comprises a shell 11, a shell lug 12 and a binding post 13, the shell 11 is a hollow cylinder, two groups of shell lugs 12 and binding posts 13 are respectively arranged on two end faces of the shell 11, the shell lugs 12 are arranged inside the shell 11, the binding posts 13 are arranged outside the shell 11, and the shell lugs 12 and the binding posts 13 penetrate through the wall surface of the shell 11 to be connected; the fusible core 2 sets up in casing 11, and fusible core 2 is including setting up the core lug 22 at both ends, and core lug 22 contacts with shell connector lug 12 respectively, and positioning block 3 sets up on 11 terminal surfaces of casing, and positioning block 3 is connected to fusible core 2 and controls it rotatory around casing 11.

This circuit breaker sets up in the circuit in series, two terminals 13 are external joint, it is inside shell lug 12, core lug 22, fusible core 2 in proper order on the circuit path of two terminals 13, another core lug 22, another shell lug 12, another terminal 13, the effect of overload fusing is undertaken to fusible core 2 inside wherein, when the electric current was too big in the circuit, the metal route disconnection in fusible core 2, cut on the main circuit, the circuit breaker effect is accomplished. The positioning block 3 drives the fusible core 2 to rotate so as to recycle the fusible core 2, a recyclable fusing part is arranged in the fusible core 2, and after the fusing part on the upper part is fused and a short-circuit fault on a main circuit is eliminated, the fusing part on the lower part is used for fusing in the next period to be executed after the fusing part on the upper part is turned upside down.

As shown in fig. 2 and 3, the fusible core 2 further includes a core shell 21, a rotary column 23 and a hot melt 24, the cross section of the core shell 21 along the axis of the shell 11 is a waist circle, two ends of the core shell 21 are closed, the core shell 21 is filled with the hot melt 24, the core lugs 22 are four, two in one set are respectively arranged at two ends of the core shell 21, the core lugs 22 at each end are respectively located at the upper and lower parts of the end surface, the core lugs 22 penetrate through the wall surface of the core shell 21 and extend into the core shell 21, the rotary column 23 is arranged at two ends of the outer surface of the core shell 21 along the axis of the shell 11, and the rotary column 23 is in transmission connection with the positioning block 3.

The present invention uses a fusible metal body as a fusing part, i.e., a hot melt 24, as shown in fig. 3, the hot melt 24 is initially in a solid state at an upper portion, the hot melt 24 connects the core lugs 22 at both sides at the upper portion, when a circuit current is large, the upper hot melt 24 for circuit connection starts to melt, the melted hot melt 24 flows to a lower portion of the core housing 21, the two core lugs 22 at the upper portion are disconnected, the fusing process of the present circuit breaker is realized, the hot melt 24 flowing to the lower portion is re-solidified after cooling and connects the two core lugs 22 at the lower portion together, when a fault on a main circuit is eliminated from the outside, the fusible core 2 only needs to be rotated to be upside down, thereby being used as a new fusible core 2, and the hot melt 24 is melted and flows from an upper space to a lower space of the core housing 21 and is filled after a current overload occurs in the period, the periodic cycle is carried out in this way, and the purpose of recycling the fusible core 2 is achieved. It should be noted that the core 2 can only be used for conducting the hot melt 24 inside, but not for the core shell 21 to have conducting capability, so the core shell 21 should be made of an insulator, such as a ceramic core shell 21 or a high temperature resistant plastic core shell 21; the melting temperature of the hot melt 24 has a certain requirement, in order to melt, the melting point cannot be too high, and the hot melt cannot be melted and cut off by a little heat, so the melting point is higher than the room temperature to a certain extent, and the four kinds of pure metals which are roughly available in the existing material are inquired about each melting point of the pure metal, namely potassium (melting point 63 ℃), sodium (melting point 98 ℃), lithium (melting point 182 ℃), and tin (melting point 230 ℃), and the electrical conductivity is not taken as a primary consideration here, because the resistance of the melting core can be adjusted by designing different axial end surface areas of the core shell 21, and the rest materials such as metal alloy and the like have various types and different mixing ratios and different physical properties, which cannot be exemplified one by one, when a new material is used, a prototype test is carried out as long as the fusing effect of the invention can be obtained and the metal alloy flows to the lower part of the core shell 21.

As shown in fig. 4 and 5, the positioning block 3 includes a knob 31 and a force transmission cylinder 32, a central hole 111 is disposed in the center of the end surface of the housing 11, one end of the force transmission cylinder 32 is disposed with the knob 31, and the other end thereof passes through the central hole 111 and is in transmission connection with the rotary column 23 through a key or a spline, and the knob 31 is located outside the housing 11.

After the force transmission cylinder 32 is connected with the rotary column 23 through a key or a spline, the fusible core 2 can be stirred to rotate through the knob 31 positioned outside the shell 11, because the rotation axis of the fusible core 2 is the axis of the force transmission cylinder 32, the core lugs 22 at four positions on the end surface of the core shell 21 all use the axis of the force transmission cylinder 32 as the rotation center line, so as to be respectively abutted against the shell lugs 12 at the same position for electric connection, the core lugs 22 can be in the shape of an arc sheet or a cylinder point, wherein the arc sheet is taken as the preferred shape, and the connection is more sufficient because the contact area is larger.

As shown in fig. 4 and 5, the positioning block 3 further includes two limiting posts 33, the limiting posts 33 are disposed on the outer surface of the force transmission cylinder 32 and extend radially, the limiting posts 33 are different by one hundred eighty degrees, the inner wall of the housing 11 is provided with limiting grooves 112 different by one hundred eighty degrees, a spring 4 is disposed between the force transmission cylinder 32 and the core shell 21, the spring 4 is in a compressed state, and the limiting posts 33 are embedded in the limiting grooves 112.

The fusible core 2 only needs to be turned upside down, other angle positions are not needed, namely, only the positioning at two angle positions is needed, although the angle position of the fusible core 2 can be displayed by drawing scales on the outer surface of the shell 11, if the positioning block 3 only has a rotary driving function, the loose of the fusible core can be generated due to some vibration in the use occasion, the shell wiring piece 12 is disconnected from the core wiring piece 22 to cause circuit truncation and influence normal use, therefore, the invention uses two limiting columns 33 and two limiting grooves 112 with one hundred eighty degrees of difference as the positioning structure, and can play a role of anti-loosening after the positioning is finished, because the spring 4 pushes the positioning block 3 outwards, the limiting columns 33 are embedded into the limiting grooves 112, under the condition that the elastic force of the spring 4 is not overcome, the rotary position of the positioning block 3 is locked, the position adjusting block 3 is in transmission connection with the fusible core 2, the position adjusting block 3 cannot rotate, and the fusible core 2 cannot rotate, so that the position is fixed, when the fusible core 2 needs to be turned upside down outside, the position adjusting block 3 is pushed inwards by a small distance along the axial direction, the limiting column 33 is separated from the limiting groove 112, then the knob 31 is manually turned, the fusible core 2 is loosened after being rotated by one hundred eighty degrees, the limiting column 33 falls back to the limiting groove 112 again, and the fusible core 2 is turned upside down and is locked.

As shown in fig. 7, the two terminals 13 also have circuit connections in parallel relationship with the fusible core 2, and a resistor 51 and an indicator lamp 52 are provided on the circuit connections.

When a short circuit exists on the main circuit to melt the fusible core 2, the indicator lamp 52 is used to indicate whether the short circuit fault is eliminated, and the principle is as follows: the main circuit is short-circuited, the two binding posts 13 are also connected with the indicator lamp 52 through the resistor 51, so that voltage on the main circuit is loaded at two ends of the resistor 51 and the indicator lamp 52, the resistance value of the resistor 51 is large, the current consumption is low, a trace amount of current drives the indicator lamp 52 to be constant, the short-circuit fault existing in the main circuit is not eliminated at the moment, after the short-circuit fault is eliminated, the low-resistance path of the main circuit is disconnected, the resistor 51 and the indicator lamp 52 are in series connection with all loads on the main circuit, the whole voltage of the main circuit is not distributed, as long as the flashing current threshold value of the indicator lamp 52 is set to be proper, the indicator lamp 52 can be extinguished after the short circuit on the.

As shown in fig. 6, the rotational angle positioning of the fusible core 2 can also be accomplished by another structure:

the shell lug 12 is an elastic reed and is butterfly-shaped, the core lug 22 is arc-shaped and is provided with a cylindrical core 221 at the center, and the arc of the core lug 22 takes the center line of the shell 11 as an axis.

When the rotary fusible core 2 is about to reach the position, the shell wiring sheet 12 serves as an elastic spring to provide insertion resistance, and when the rotary fusible core 2 is completely in place, the cylindrical sheet core 221 is inserted into the butterfly center of the shell wiring sheet 12 and locked, so that the hand feeling is obvious and the looseness is prevented.

As shown in fig. 7, voltage sensors 53 are connected in parallel at two ends of the whole of the resistor 51 and the indicator lamp 52, a locking structure is arranged in the wall surface of the end part of the shell 11, the limiting column 33 is clamped or opened by the locking structure, and signals of the voltage sensors 53 are transmitted to the locking structure.

The voltage sensor 53 is used for identifying the voltage loaded at the two ends of the whole of the resistor 51 and the indicator lamp 52, if the loaded voltage is the whole voltage on the main circuit (the resistance value partial pressure of the main circuit wire is neglected), it is indicated that a short-circuit fault exists on the main circuit, at this time, the fusible core 2 should not be reversed to reconnect the short circuit device, although the indicator lamp 52 indicates the fault, in order to prevent misoperation, a protective measure is additionally arranged to prevent the circuit breaker from being reconnected when the fault is not eliminated, the signal of the voltage sensor 53 is used as a driving signal, and a locking structure is arranged in the wall surface of the end part of the shell 11 to lock the limit column 33, so that the fault is prevented from being separated from. The locking structure can be a telescopic rod and a jack is arranged on the limiting column 33, the telescopic rod extends into the limiting groove 112 and is inserted into the jack on the limiting column 33, so that the locking purpose is realized, the locking structure such as a lifting type blocking piece covers the limiting groove 112 after falling, and the limiting column 33 cannot be separated from the limiting groove 112.

The hot melt 24 is metallic sodium. The circuit breaker comprises potassium (with a melting point of 63 ℃), sodium (with a melting point of 98 ℃), lithium (with a melting point of 182 ℃), and tin (with a melting point of 230 ℃), wherein the melting point of the potassium is only higher than the room temperature of forty degrees, and the circuit breaker can easily reach the melting temperature when used in hot summer and high-temperature environments, so that the current which can be passed through the circuit breaker is small, and the lithium and the tin are too much higher than the room temperature and can be fused by large current, thereby being suitable for a large-current circuit breaker. Sodium is most suitable.

As shown in fig. 3, cavity ridges 211 are arranged at the upper and lower symmetrical lines of the inner wall of the core shell 21, and the surface of the cavity ridges 211 is coated with a hydrophobic layer. The cavity ridge 211 and the hydrophobic layer thereon sufficiently separate the upper and lower parts in the core housing 21 on the inner wall, so that the flowing hot melt 24 can only select the upper part or the lower part of the core housing 21 as an accommodating space, and no metal wire connection occurs in the middle.

The use principle of the invention is as follows: the circuit breaker is connected into a main circuit, two binding posts 13 are used as connecting joints, when a short circuit occurs on the main circuit, the heat of a hot melt 24 in a fusible core 2 is not discharged in time, the hot melt is melted after the temperature is increased to a self melting point and flows to a lower space in a core shell 21 and then is cooled and solidified, two core lugs 22 on the side surface of the upper part of the core shell 21 are not connected, the circuit breaking operation of the circuit breaker is finished, when a short circuit fault on the main circuit is discharged outside, a manager presses down a knob 31 and rotates for one hundred eighty degrees, releases the knob 31, the fusible core 2 is turned upside down, the core lugs 22 on two sides of the lower part of the core shell 21 are used as contact access circuits, the hot melt 24 is used as a fusing part access circuit again, and the circuit.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A miniature circuit breaker, characterized by: the miniature circuit breaker comprises a shell (1), a fusible core (2) and a position adjusting block (3), wherein the shell (1) comprises a shell (11), shell lugs (12) and a binding post (13), the shell (11) is a section of hollow cylinder, two groups of shell lugs (12) and binding posts (13) are respectively arranged on two end faces of the shell (11), the shell lugs (12) are arranged inside the shell (11), the binding posts (13) are arranged outside the shell (11), and the shell lugs (12) and the binding posts (13) penetrate through the wall face of the shell (11) to be connected; fusible core (2) set up in casing (11), fusible core (2) are including setting up core lug (22) at both ends, core lug (22) contact with shell wire connector lug (12) respectively, transposition piece (3) set up on casing (11) terminal surface, and transposition piece (3) are connected to fusible core (2) and control it and rotate around casing (11).

2. A miniature circuit breaker according to claim 1, wherein: the fusible core (2) further comprises a core shell (21), a rotary column (23) and a hot melt body (24), the cross section of the core shell (21) along the axis of the shell (11) is circular, the two ends of the core shell (21) are sealed, the hot melt body (24) is filled in the core shell (21), the core lugs (22) are four pieces, two sets of the core lugs are arranged at the two ends of the core shell (21), the core lugs (22) at each end are respectively located at the upper part and the lower part of the end face, the core lugs (22) penetrate through the wall face of the core shell (21) and stretch into the core shell (21), the rotary column (23) is arranged at the two outer ends of the core shell (21) along the axis of the shell (11), and the rotary column (23) is in transmission connection with the positioning block (3).

3. A miniature circuit breaker according to claim 2, wherein: the position adjusting block (3) comprises a knob (31) and a force transmission barrel (32), a central hole (111) is formed in the center of the end face of the shell (11), one end of the force transmission barrel (32) is provided with the knob (31), one end of the force transmission barrel penetrates through the central hole (111) to be in transmission connection with the rotary column (23) through a key or a spline, and the knob (31) is located outside the shell (11).

4. A miniature circuit breaker according to claim 3, wherein: the position adjusting block (3) further comprises two limiting columns (33), the limiting columns (33) are arranged on the outer surface of the force transmission cylinder (32) and extend radially, the limiting columns (33) differ by one hundred eighty degrees, limiting grooves (112) differing by one hundred eighty degrees are formed in the inner wall of the shell (11), springs (4) are arranged between the force transmission cylinder (32) and the core shell (21), the springs (4) are in a compression state, and the limiting columns (33) are embedded into the limiting grooves (112).

5. A miniature circuit breaker according to claim 3, wherein: the shell lug (12) is an elastic reed and is butterfly-shaped, the core lug (22) is arc-shaped, a cylindrical core piece (221) is arranged in the center, and the arc of the core lug (22) takes the center line of the shell (11) as an axis.

6. A miniature circuit breaker according to claim 4, wherein: the two terminals (13) are also provided with a circuit connection in parallel relation with the fusible core (2), and a resistor (51) and an indicator light (52) are arranged on the circuit connection.

7. A miniature circuit breaker according to claim 6, wherein: resistance (51) and pilot lamp (52) holistic both ends are parallelly connected with voltage sensor (53), set up the locking structure in casing (11) tip wall, the locking structure blocks or opens spacing post (33), voltage sensor (53) signal transmission is for the locking structure.

8. A miniature circuit breaker according to claim 2, wherein: the hot melt (24) is metallic sodium.

9. A miniature circuit breaker according to claim 2, wherein: cavity ridges (211) are arranged on the upper and lower symmetrical lines of the inner wall of the core shell (21), and the surfaces of the cavity ridges (211) are coated with hydrophobic layers.