CN108269719B - Circuit breaker operating mechanism and assembly method thereof - Google Patents
Circuit breaker operating mechanism and assembly method thereof Download PDFInfo
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- CN108269719B CN108269719B CN201710004224.3A CN201710004224A CN108269719B CN 108269719 B CN108269719 B CN 108269719B CN 201710004224 A CN201710004224 A CN 201710004224A CN 108269719 B CN108269719 B CN 108269719B
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- handle
- lever
- circuit breaker
- lock catch
- shell
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/40—Combined electrothermal and electromagnetic mechanisms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
- H01H3/46—Driving mechanisms, i.e. for transmitting driving force to the contacts using rod or lever linkage, e.g. toggle
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H69/00—Apparatus or processes for the manufacture of emergency protective devices
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- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Breakers (AREA)
Abstract
A circuit breaker operating mechanism and an assembly method thereof are provided, wherein the circuit breaker operating mechanism comprises a handle, a moving contact and a lock catch which are respectively pivoted and installed in a shell, the handle is elastically connected with the shell through a first spring, the handle is in driving connection with the moving contact through a transmission assembly, and the moving contact is elastically connected with the shell through a second spring; the connecting rod of the transmission assembly is in hasp connection with the lock catch, and the lock catch is in elastic connection with the shell through the third spring. The assembling method of the circuit breaker operating mechanism comprises the steps that a handle rotating shaft, a mounting shaft and a fulcrum shaft are respectively mounted on a bottom plate of a shell; the first spring and the handle are sequentially and rotatably arranged on the handle rotating shaft; the movable contact is rotatably arranged on the fulcrum; the transmission assembly is arranged on the handle and the movable contact in a stacking mode; mounting two ends of a second spring on the mounting shaft and the movable contact; the latch is pivotally mounted on the fulcrum. The invention provides a circuit breaker operating mechanism with simple structure and convenient assembly and an assembly method thereof.
Description
Technical Field
The invention relates to the field of low-voltage electrical appliances, in particular to a circuit breaker operating mechanism and an assembling method thereof.
Background
Circuit breakers utilize various mechanisms to unlock the circuit to detect faults and open the circuit affected by the fault. The unlocking device comprises a sensor and activates the mechanism of the circuit breaker which, upon detection of a fault, causes the disconnection of the movable contact from the fixed contact. One type of trip device used in circuit breakers is an electromagnetic trip device, which is commonly used to open circuit breakers during an emergency event. One example of an electromagnetic trip device is a solenoid connected in series to a conductor of a circuit breaker and arranged to activate an operating mechanism when the current in the conductor exceeds a predetermined level. Another type of trip device used in circuit breakers is a thermal trip device, which is commonly used to open circuit breakers during overload events. One example of a thermal trip device is a thermal element, typically a bimetal element (bimetal), which is connected in series to the conductor of the circuit breaker and is arranged to activate the operating mechanism when the current in the conductor exceeds a predetermined level for a predetermined amount of time.
The existing circuit breaker operating mechanism has many parts and is difficult to assemble and difficult to realize automatic assembly, so that the circuit breaker is high in assembly cost. Meanwhile, the problem of manual assembly is more. In recent years, the domestic labor cost is increased, and the assembly cost of circuit breaker assembly personnel is obviously increased. Therefore, a breaker capable of replacing manual assembly by a machine is needed, and the labor cost is greatly reduced on the premise of ensuring the requirements of each index of the breaker.
In addition, the existing circuit breaker is usually provided with a contact supporting member for supporting and installing the moving contact and serving as a transmission member between the operating mechanism and the moving contact, so as to ensure the stable action of the moving contact. However, with the trend of miniaturization design of circuit breakers, a part of a contact support member is omitted for simplifying the structure, and the phenomenon of axial deviation of a rotating shaft of a moving contact easily occurs when the moving contact acts under the conditions of losing the support and the limit of the contact support member, so that the stability of the moving contact is difficult to guarantee, and the overall performance of the circuit breaker is affected.
Moreover, an elastic member is disposed between the latch for cooperating with the electromagnetic trip device and the breaker housing in the conventional circuit breaker operating mechanism to ensure that the latch can be reset, and the elastic member generally adopts a torsion spring or a general spring, or is inconvenient to install, or has insufficient connection stability and elasticity.
Disclosure of Invention
the invention aims to overcome the defects of the prior art and provides a circuit breaker operating mechanism which is simple in structure and convenient to assemble and an assembling method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
A circuit breaker operating mechanism comprises a handle 2, a movable contact 4 and a lock catch 6 which are respectively pivotally mounted in a shell 1, wherein the handle 2 is elastically connected with the shell 1 through a first spring 20 to realize that the handle 2 can reset, the handle 2 is in driving connection with one end of the movable contact 4 through a transmission component 3, the other end of the movable contact 4 is matched with a fixed contact 5 in the shell 1, and the movable contact 4 is elastically connected with the shell 1 through a second spring 40 to realize that the movable contact 4 can reset; the connecting rod 30 of the transmission component 3 is in snap connection with the lock catch 6, and the lock catch 6 is elastically connected with the shell 1 through a third spring 60 to realize that the lock catch 6 can reset;
The handle 2 can drive the moving contact 4 to rotate through the transmission component 3 so as to be contacted with or separated from the static contact 5 to realize the closing or breaking of the circuit breaker; when the lock catch 6 is unlocked from the connecting rod 30, the moving contact 4 is driven to rotate so as to be separated from the static contact 5, and the circuit breaker is tripped.
Preferably, the connecting rod 30 and the latch 6 are respectively stacked on the movable contact 4, and the stacked latch 6 and the movable contact 4 are rotatably mounted on the fulcrum 12 to be coaxially and pivotally mounted in the housing 1, the latch 6 is provided with a first shaft hole 61 matched with the fulcrum 12, and the movable contact 4 is provided with a second shaft hole 41 matched with the fulcrum 12.
preferably, the middle part of the connecting rod 30 is in driving connection with the handle 2, one end of the connecting rod 30 is in driving connection with the movable contact 4, and the other end is in hasp connection with the latch 6.
preferably, the handle 2 is in driving connection with the connecting rod 30 through a first lever 31, and two ends of the first lever 31 are respectively inserted into a first lever hole of the handle 2 and a second lever hole 33 of the connecting rod 30; the connecting rod 30 is in driving connection with the movable contact 4 through the second lever 32, one end of the second lever 32 is inserted into the third lever hole 34 of the connecting rod 30 and the fourth lever hole 42 of the movable contact 4 in sequence, and the other end is inserted into the fifth lever hole 43 of the movable contact 4.
Preferably, one side of the moving contact 4 is provided with the fixed contact 5 and the second spring 40, and the other side of the moving contact 4 is provided with the limiting shaft 13; the second spring 40 is a tension spring, one end of the second spring 40 is hooked on the mounting shaft 11 of the housing 1, and the other end is hooked in the mounting hole 44 of the movable contact 4.
Preferably, the circuit breaker further comprises an electromagnetic system 7 and a bimetallic strip 9 which are arranged in the housing 1, wherein the electromagnetic system 7 comprises a striker 71 which is in touch fit with the triggering part 64 of the latch 6; the thermal trip device comprises a pull rod 8 connected with the lock catch 6 and a bimetallic strip 9 matched with the pull rod 8 in a pulling way.
preferably, one end of the latch 6 is in snap-fit connection with the connecting rod 30, the other end of the latch is provided with a pull rod hole 66 for connecting the pull rod 8, one side of the middle part of the latch 6 is provided with the trigger part 64, and the other side of the middle part is pivotally mounted on the housing 1.
preferably, the movable contact 4 is rotatably mounted on the fulcrum 12 of the housing 1 through a second shaft hole 41 thereon, and the second shaft hole 41 is a kidney-shaped hole with a length greater than the outer diameter of the fulcrum 12, so that the movable contact 4 can move relative to the fulcrum 12 along the length direction of the second shaft hole 41.
the operating mechanism of the circuit breaker is characterized in that the connecting rod is used as a transmission pivot among the handle, the moving contact and the lock catch, the handle directly drives the moving contact to rotate through the connecting rod to realize the closing and breaking of the circuit breaker, the lock catch directly unlocks with the connecting rod to drive the moving contact to rotate to realize the tripping of the circuit breaker, a supporting piece for supporting and installing the connecting rod, the lock catch and the moving contact is omitted, the structure is simplified, the number of parts is reduced, the assembly is simpler and more convenient, the automatic assembly is convenient to realize, the production cost is reduced, the assembly efficiency is improved, the transmission path is shortened, the transmission is reliable and stable, and the reliability.
A method of assembling a circuit breaker operating mechanism comprising the steps of:
a. The handle rotating shaft 15, the mounting shaft 11 and the fulcrum shaft 12 are respectively mounted on the bottom plate 10 of the shell 1;
b. a first spring 20 for resetting the handle 2 and the handle 2 are sequentially and rotatably arranged on a handle rotating shaft 15 of the shell 1;
c. The movable contact 4 is rotatably arranged on a fulcrum 12 of the shell 1;
d. The transmission component 3 is arranged on the handle 2 and the moving contact 4 in a laminating way, and two ends of the transmission component 3 are respectively connected with the handle 2 and the moving contact 4, so that the handle 2 and the moving contact 4 are in driving connection;
e. One end of a second spring 40 for resetting the movable contact 4 is arranged on the mounting shaft 11 of the shell 1, and the other end is arranged in a mounting hole 44 of the movable contact 4;
f. the lock catch 6 is rotatably mounted on a fulcrum 12 of the shell 1 and is stacked on the movable contact 4, and one end of the lock catch 6 is opposite to the transmission component 3.
preferably, before step d, one end of the first lever 31 and one end of the second lever 32 of the transmission assembly 3 at the two ends are respectively inserted into the second lever hole 33 and the third lever hole 34 of the connecting rod 30; when the transmission assembly 3 is installed in step d, the other end of the first lever 31 is inserted into the first lever hole of the handle 2, and simultaneously, the two ends of the second lever 32 are respectively inserted into the fourth lever hole 42 and the fifth lever hole 43 of the movable contact 4.
according to the assembling method of the circuit breaker operating mechanism, the shafts of the shell are used as the mounting positioning points, and the parts of the circuit breaker operating mechanism are sequentially stacked, so that the assembling difficulty is simplified, the whole mounting process is ensured to be orderly, and the automatic assembly is convenient to realize.
Drawings
Fig. 1 is a schematic structural view of a circuit breaker of the present invention;
fig. 2 is a schematic structural view of the circuit breaker operating mechanism of the present invention;
FIG. 3 is a schematic structural view of the connecting rod of the present invention;
Fig. 4 is a schematic structural view of the movable contact of the present invention;
FIG. 5 is a schematic view of the structure of the latch of the present invention;
FIG. 6 is an enlarged view of a portion of FIG. 1 in accordance with the present invention;
FIG. 7 is a schematic structural view of the transmission assembly of the present invention;
FIG. 8 is a schematic structural view of one embodiment of a second lever of the present invention;
Fig. 9 is a schematic structural view of another embodiment of the second lever of the present invention.
Detailed Description
The following further describes embodiments of the circuit breaker operating mechanism and the method of assembling the same according to the present invention, in conjunction with the embodiments shown in fig. 1 to 9. The circuit breaker operating mechanism and the assembling method thereof of the present invention are not limited to the description of the following embodiments.
As shown in fig. 1, the circuit breaker operating mechanism of the present invention includes a handle 2, a movable contact 4 and a latch 6, which are pivotally mounted in a housing 1, respectively, wherein the handle 2 is elastically connected to the housing 1 through a first spring 20 to enable the handle 2 to be resettable, the handle 2 is drivingly connected to one end of the movable contact 4 through a transmission assembly 3, the other end of the movable contact 4 is matched with a fixed contact 5 in the housing 1, and the movable contact 4 is elastically connected to the housing 1 through a second spring 40 to enable the movable contact 4 to be resettable; the connecting rod 30 of the transmission component 3 and the lock catch 6 can be in snap connection, and the lock catch 6 is elastically connected with the shell 1 through a third spring 60 to realize that the lock catch 6 can be reset; the handle 2 can drive the moving contact 4 to rotate through the transmission component 3 so as to be contacted with or separated from the static contact 5 to realize the closing or breaking of the circuit breaker; when the lock catch 6 is unlocked from the connecting rod 30, the moving contact 4 is driven to rotate so as to be separated from the static contact 5, and the circuit breaker is tripped. Through the connecting rod as the handle, the transmission pivot between moving contact and the hasp, the handle directly drives the moving contact through the connecting rod and rotates the closure and the branch that realize the circuit breaker, the hasp is direct to drive the moving contact through removing the locking with the connecting rod and rotate the dropout that realizes the circuit breaker, save and be used for supporting and installing the connecting rod, the support piece of hasp and moving contact, the simplified structure, reduce the quantity of spare part, the assembly is simple and convenient more, be convenient for realize automatic assembly, reduction in production cost, improve assembly efficiency, shorten the transmission route simultaneously, the transmission is reliable stable, the reliability and the stability of circuit breaker are improved.
as shown in fig. 1-4, specifically, the connecting rod 30 and the latch 6 are respectively stacked on the movable contact 4, and the stacked latch 6 and the movable contact 4 are rotatably mounted on the fulcrum 12 to be coaxially and pivotally mounted in the housing 1, the latch 6 is provided with a first shaft hole 61 matched with the fulcrum 12, the middle of the movable contact 4 is provided with a second shaft hole 41 matched with the fulcrum 12, the movable contact 4 is rotatably mounted on the fulcrum 12 of the housing 1 through the second shaft hole 41 thereon, and the fulcrum 12 is vertically fixed on the bottom plate 10 of the housing 1. The connecting rod and the lock catch which are connected through the hasp are stacked on the movable contact respectively and located on the same level, and the lock catch and the movable contact are coaxially arranged, so that the structure is simplified, the layers are clear, the sequential assembly is facilitated, the automatic assembly is realized, the assembly level is improved, the hasp connecting structure with a simple structure between the connecting rod and the lock catch is facilitated, the quick and orderly transmission among parts of an operating mechanism is ensured, the transmission is more reliable and stable, the closing and breaking performances of the circuit breaker are improved, and the tripping action is quicker and more stable.
The connecting rod 30 is provided with a locking tooth 35 for snap-in connection with the lock catch 6, and the locking tooth 35 is lapped in a lapping gap 62 at the end of the lock catch 6 to ensure the movement of the operating mechanism. The hasp structure of lock tooth and breach formula, the installation accuracy requires lowly, the automatic assembly of being convenient for. In addition, the middle part of the connecting rod 30 is in driving connection with the handle 2, one end of the connecting rod 30 is in driving connection with the moving contact 4, and the other end of the connecting rod 30 is in hasp connection with the lock catch 6. The handle 2 is drivingly connected to the connecting rod 30 through a first lever 31, and both ends of the first lever 31 are respectively inserted into a first lever hole of the handle 2 and a second lever hole 33 of the connecting rod 30. The connecting rod 30 is in driving connection with the movable contact 4 through the second lever 32, one end of the second lever 32 is inserted into the third lever hole 34 of the connecting rod 30 and the fourth lever hole 42 of the movable contact 4 in sequence, and the other end is inserted into the fifth lever hole 43 of the movable contact 4. Linkage and spacing are realized through connecting rod and the moving contact that the second lever is laminated together, also can the stable transmission between each part under the guarantee operating device saved the part, improve linkage nature and synchronism, connect through lever cartridge formula simultaneously and can realize the linkage between connecting rod and handle and the moving contact, assembly easy operation is convenient for realize automatic assembly. The fifth lever hole 43 is located between the fourth lever hole 42 and the second shaft hole 41.
As shown in fig. 4, in the structure of the moving contact of the present invention, the entire moving contact 4 is formed by punching a metal plate, and is in a strip shape similar to a rectangle, so as to utilize the original plate to the maximum extent. The movable contact 4 is rotatably mounted on the support shaft 12 of the housing 1 through a second axial hole 41 formed therein, and the second axial hole 41 is a kidney-shaped hole having a length greater than the outer diameter of the support shaft 12, so that the movable contact 4 can move relative to the support shaft 12 along the direction a, which is the longitudinal direction of the second axial hole 41. In addition, one side of the moving contact 4 is provided with the fixed contact 5 and the second spring 40, and the other side of the moving contact 4 is provided with the limiting shaft 13 for limiting the distance between the moving contact 4 and the fixed contact 5; the second spring 40 is a tension spring, one end of the second spring 40 is hooked on the mounting shaft 11 of the housing 1, and the other end is hooked in the mounting hole 44 of the movable contact 4; the mounting hole 44 is located between the fifth lever hole 43 and the second shaft hole 41. The mounting hole 44 is communicated with the second shaft hole 41, and machining and manufacturing are facilitated. The circuit breaker is in the open state as shown in fig. 2, the fulcrum 12 is in the right arc against the second shaft hole 41; in the switching-on process of the circuit breaker, before the moving contact 4 and the static contact 5 are not contacted, the moving contact 4 rotates by taking the fulcrum 12 as a center until the moving contact 4 and the static contact 5 are contacted, the moving contact 4 rotates by taking a contact point of the moving contact 4 and the static contact 5 as a center, and at the moment, the fulcrum 12 is separated from the moving contact 4 until an operating mechanism is locked.
As shown in fig. 1, in the first spring mounting structure of the present invention, the handle 2 is rotatably mounted on the handle rotating shaft 15 of the housing 1, the first spring 20 is a torsion spring, a spring body in the middle of the first spring 20 is sleeved on the handle rotating shaft 15 and is located between the handle 2 and the bottom plate of the housing 1, and two ends of the first spring 20 are respectively abutted against the handle 2 and the housing 1.
The circuit breaker of the invention further comprises an electromagnetic system 7 and a bimetallic strip 9 which are arranged in the shell 1, wherein the electromagnetic system 7 comprises a striker 71 which is in touch fit with the triggering part 64 of the latch 6. When the electromagnetic tripping condition is reached in the circuit, the striker 71 of the electromagnetic system 7 springs out and strikes against the trigger portion 64 of the latch 6 to drive the latch 6 to rotate about the fulcrum 12 to disengage from the link 30, and the operating mechanism is unlocked. The thermal trip device comprises a pull rod 8 connected with the lock catch 6 and a bimetallic strip 9 matched with the pull rod 8 in a pulling way. When a thermal trip condition is reached in the circuit, the bimetal 9 bends and drives the pull rod 8 to pull the latch 6, so as to drive the latch 6 to rotate around the fulcrum 12 to be separated from the connecting rod 30, and the operating mechanism is unlocked. It is to be emphasized that: the unlocking occurs only when the electromagnetic system 7 or the bimetallic strip 9 of the circuit breaker drives the latch 6, or only during the tripping process of the circuit breaker, and the unlocking cannot occur during the normal switching-on and switching-off processes. Under normal closing state and normal separating brake state, and in normal closing operation process and normal separating brake operation process, because the electromagnetic system 7 or bimetallic strip 9 of circuit breaker do not drive hasp 6, consequently hasp 6 is in the locking cooperation state all the time.
in addition, as shown in fig. 1 and 5, one end of the latch 6 is in snap-fit connection with the link 30, the other end of the latch 6 is opposite to the thermal trip device of the circuit breaker, a pull rod hole 66 for connecting the pull rod 8 is provided, one side surface of the middle of the latch 6 is provided with a trigger part 64 matched with the electromagnetic system 7, and the other side surface of the middle of the latch 6 is provided with a first shaft hole 61 for pivotally mounting on the housing 1 and a hook 63 for abutting against the lap part 600 of the third spring 60. The tripping device of the circuit breaker drives the lock catch to rapidly act, and the tripping performance of the circuit breaker is improved. The trigger part 64 of the lock catch 6 is provided with a linkage shaft hole 65 which is used for connecting a linkage part which can unlock the operating mechanism on the shell 1; the axial directions of the interlocking shaft hole 65 and the first shaft hole 61 are parallel to each other. The linkage portion may be a linkage shaft connecting latches of the plurality of single-pole circuit breakers.
In the closing process of the circuit breaker, the handle 2 overcomes the first spring 20 from the beginning to do work, and pushes the connecting rod 30 to move forwards, and due to the pressure action of the third spring 60, the connecting rod 30 is in contact with the buckle 6, so that the movable contact 4 is pushed to rotate around the fulcrum 12, and the movable contact 4 moves to approach the static contact 5 on the electromagnetic system 7 until the static contact is closed. At this time, the movable contact 4 moves forward again by taking the joint point of the movable contact 4 and the fixed contact 5 as a fulcrum until the handle 2 is completely switched on, and the second spring 40 overcomes the working of the movable contact 4 and provides final pressure for the product in the process.
in the tripping process of the circuit breaker, after respective faults are triggered, the electromagnetic system 7 with the instantaneous protection function and the bimetallic strip 9 with the delay protection function both utilize the lock catch 6 or the pull rod 8 connected to the lock catch 6 to drive the connecting rod 30 to unlock an operating mechanism of the circuit breaker, the movable contact 4 resets under the action of the second spring 40 and stops after being blocked by the limiting shaft 13 on the shell 1, meanwhile, the handle 2 resets to the opening position under the action of the first spring 20, and the lock catch 6 resets under the action of the third spring 60. If the instantaneous current is in the appointed tripping range in the closing state, the lock catch 6 is acted on the tripping position, the connecting rod 30 and the lock catch 6 cannot be buckled by the handle 2 in the moving process, so that the handle 2 cannot be closed to the closing position, and the free tripping function of the circuit breaker is realized.
as shown in fig. 7, the transmission assembly of the circuit breaker of the present invention, the connecting rod 30 and the movable contact 4 are installed in a housing 1 of the circuit breaker in a stacked manner, and the movable contact 4 is positioned between the connecting rod 30 and the bottom plate 10 of the shell 1, the connecting rod 30 is in driving connection with the movable contact 4 through the second lever 32, the second lever 32 includes first and second transmission arms 321 and 322 disposed perpendicular to the base plate 10 and a connection part 323 connected between one ends of the first and second transmission arms 321 and 322, the other end of the first transmission arm 321 passes through the third lever hole 34 of the connecting rod 30 and the fourth lever hole 42 of the movable contact 4 in sequence and is located between the movable contact 4 and the bottom plate 10, the other end of the second transmission arm 322 passes through the fifth lever hole 43 of the movable contact 4 and is located between the movable contact 4 and the bottom plate 10, and the connecting portion 323 is located above the connecting rod 30. Two transmission arms and connecting portion through the second lever are in order to realize between connecting rod and the moving contact drive connection and cooperate the bottom plate of casing to form the spacing closed loop to connecting rod and moving contact, and simple structure takes place the skew in the axial of transmission arm when effectively avoiding connecting rod and moving contact to rotate, improves circuit breaker operating device's action stability and reliability.
specifically, both ends of the connection portion 323 of the second lever 32 are vertically connected to the first and second transmission arms 321 and 322, respectively. As shown in fig. 7 and 8, in an embodiment of the second lever of the present invention, the second lever 32 has a U-shaped structure, two ends of the first transmission arm 321 and the second transmission arm 322 of the second lever 32 are flush with each other, the first transmission arm 321 and the second transmission arm 322 have the same length, and the connection part 323 is a straight rod vertically connected between the first transmission arm 321 and one end of the second transmission arm 322. As shown in fig. 9, the second lever of this embodiment has a simple structure, and the connecting portion of the second lever for connecting the two transmission arms adopts a straight rod, so that the transmission distance between the connecting rod and the moving contact is short, the driving force is concentrated, the quick transmission between the connecting rod and the moving contact is realized, the smooth action of the connecting rod and the moving contact is also ensured, the performance of the operating mechanism of the circuit breaker is improved, meanwhile, the automatic assembly is convenient to realize, and the assembly efficiency is improved. In another embodiment of the second lever of the present invention, one end of the first transmission arm 321 and one end of the second transmission arm 322 are arranged in parallel, and the length of the first transmission arm 321 is greater than that of the second transmission arm 322, the connection part 323 is a three-stage step bar connected between the other ends of the first transmission arm 321 and the second transmission arm 322, two end sections of the step bar are respectively connected to the first transmission arm 321 and the second transmission arm 322 vertically, an intermediate section of the step bar is parallel to the first transmission arm 321 and the second transmission arm 322, and an intermediate section of the step bar has a length equal to a length difference between the first transmission arm 321 and the second transmission arm 322. The connecting portion that the second lever of this embodiment is used for connecting two transmission arms adopts the ladder pole of syllogic, has further injectd the moving contact, effectively avoids the moving contact to take place the skew in the axial of transmission arm, improves the stationarity of action.
as shown in fig. 1 and 6, the elastic connection structure of the breaker housing and the latch of the invention includes a housing 1 and a latch 6 matched with a breaker electromagnetic system 7, wherein the latch 6 is elastically connected with the housing 1 through a third spring 60, the third spring 60 is a spring plate, one end of the spring plate is a lap joint part 600 and is lapped on the latch 6, and the other end of the spring plate is a bending part and is installed on a limit structure of the housing 1. Elastic connection between casing and hasp is realized through replacing traditional torsional spring and ordinary spring with the spring leaf to adopt overlap joint formula connected mode between spring leaf and the hasp, simple structure, the installation operation degree of difficulty and required precision are lower, and leaf spring more does benefit to the manipulator and snatchs than the torsional spring, is convenient for realize automatic assembly, improves assembly efficiency, and the kink of spring leaf matches with the limit structure of casing simultaneously and realizes that spring leaf and casing are stably installed, improves stability and reliability.
Specifically, the limiting structure includes a first limiting block 14 located on one side of the buckle 6, the bending portion includes a first straight section 601 and a second straight section 602 which are connected at an angle, the first straight section 601 and the overlapping portion 600 are located on two sides of the first limiting block 14 respectively, the first limiting block 14 is located between the buckle 6 and the second straight section 602, and two ends of the second straight section 602 are connected with the first straight section 601 and the overlapping portion 600 respectively. The angular connection means that the included angle between the first limiting section and the second limiting section is not 0 degree or 180 degrees. Further, the first straight section 601 and the second straight section 602 are connected in an L shape, a side surface of the first limiting block 14 facing the first straight section 601 is parallel to the first straight section 601, and a side surface of the first limiting block 14 facing the second straight section 602 is parallel to the second straight section 602.
In addition, limit structure is still including the second stopper 15 that is located first stopper 14 one side, second stopper 15 is equipped with the circular arc portion 150 with first stopper 14 relative spaced, the one end of the flat section 602 of second is passed through the circular arc section and is connected with overlap joint portion 600, the circular arc section is located between first stopper 14 and the second stopper 15, and with the circular arc portion 150 looks butt of second stopper 15. The circular arc section is including the first circular arc section 603 and the second circular arc section 604 that are connected, first circular arc section 603 is connected with the one end of the straight section 602 of second, and first circular arc section 603 is protruding and support on circular arc portion 150 to second stopper 15, and the directional first stopper 14 of sunken mouth of first circular arc section 603, second circular arc section 604 is connected with the one end of overlap joint portion 600, and second circular arc section 604 is protruding to first stopper 14, and the directional second stopper 15 of sunken mouth of second circular arc section 604 supports and leans on circular arc portion 150. The bending part of the spring piece is matched with the limiting structure of the shell through the two arc sections with opposite directions, so that the limiting in multiple directions is realized, the phenomenon that the bending part of the spring piece deviates is effectively avoided, and the stability of the spring piece on the shell is further improved. Of course, the circular arc segment may also be a one-segment circular arc structure.
furthermore, the overlapping part 600 of the spring piece is overlapped on the hook 63 of the lock catch 6, and the overlapping part 600 is a straight sheet structure with one end overlapped on the arc-shaped surface of the hook 63 and the other end connected with the bending part. The lap joint part of the spring piece can still be stably lapped on the lock catch in the rotating process of the lock catch, so that the stability and the reliability are improved. The hook 63 and the bent portion are arranged in a staggered manner, and the straight lapping portion 600 is obliquely connected between the hook 63 and the bent portion.
As shown in fig. 1 and 2, the method for assembling a circuit breaker of the present invention includes the steps of:
a. The handle rotating shaft 15, the mounting shaft 11 and the fulcrum shaft 12 are respectively mounted on the bottom plate 10 of the shell 1;
b. A first spring 20 for resetting the handle 2 and the handle 2 are sequentially and rotatably arranged on a handle rotating shaft 15 of the shell 1;
c. the movable contact 4 is rotatably arranged on a fulcrum 12 of the shell 1;
d. The transmission component 3 is arranged on the handle 2 and the moving contact 4 in a laminating way, and two ends of the transmission component 3 are respectively connected with the handle 2 and the moving contact 4, so that the handle 2 and the moving contact 4 are in driving connection;
e. one end of a second spring 40 for resetting the movable contact 4 is arranged on the mounting shaft 11 of the shell 1, and the other end is arranged in a mounting hole 44 of the movable contact 4;
f. The lock catch 6 is rotatably mounted on a fulcrum 12 of the shell 1 and is stacked on the movable contact 4, and one end of the lock catch 6 is opposite to the transmission component 3.
according to the assembly method of the circuit breaker, the shafts of the shell are used as the mounting positioning points, and the parts of the circuit breaker are sequentially stacked, so that the assembly difficulty is simplified, the whole assembly process is orderly ensured, and the automatic assembly is convenient to realize.
Before step d, inserting one end of a first lever 31 and one end of a second lever 32 of the transmission assembly 3, which are positioned at the two ends, into a second lever hole 33 and a third lever hole 34 of the connecting rod 30 respectively; when the transmission assembly 3 is installed in step d, the other end of the first lever 31 is inserted into the first lever hole of the handle 2, and simultaneously, the two ends of the second lever 32 are respectively inserted into the fourth lever hole 42 and the fifth lever hole 43 of the movable contact 4.
after step f, a third spring 60 for restoring the latch 6 may be attached to the latch 6 at one end and installed in the housing 1 at the other end.
After step f, one end of the pull rod 8 can be inserted into the pull rod hole 66 of the lock catch 6, and the other end is disposed opposite to the bimetal 9.
After step b and before step c, as shown in fig. 1, an electromagnetic system 7 and an arc-extinguishing chamber of the circuit breaker may be sequentially installed in the housing 1 below the handle 2, wherein two sides of the electromagnetic system 7 are respectively connected with the stationary contact 5 and the connection terminal. The handle, the electromagnetic system and the arc extinguish chamber are arranged in sequence from top to bottom, so that automatic assembly is convenient to realize.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (8)
1. A circuit breaker operating mechanism, characterized by: the device comprises a handle (2), a movable contact (4) and a lock catch (6) which are respectively pivotally mounted in a shell (1), wherein the handle (2) is connected with the shell (1) through a first spring (20) in an elastic manner to realize that the handle (2) can reset, the handle (2) is connected with one end of the movable contact (4) through a transmission assembly (3) in a driving manner, the other end of the movable contact (4) is matched with a static contact (5) in the shell (1), and the movable contact (4) is connected with the shell (1) through a second spring (40) in an elastic manner to realize that the movable contact (4) can reset; the connecting rod (30) of the transmission assembly (3) is in hasp connection with the lock catch (6), and the lock catch (6) is elastically connected with the shell (1) through a third spring (60) to enable the lock catch (6) to be reset;
The connecting rod (30) and the lock catch (6) are respectively stacked on the moving contact (4), the handle (2) is in driving connection with the connecting rod (30) through a first lever (31), and two ends of the first lever (31) are respectively inserted into a first lever hole of the handle (2) and a second lever hole (33) of the connecting rod (30); the connecting rod (30) is in driving connection with the moving contact (4) through a second lever (32), one end of the second lever (32) is sequentially inserted into a third lever hole (34) of the connecting rod (30) and a fourth lever hole (42) of the moving contact (4), and the other end of the second lever is inserted into a fifth lever hole (43) of the moving contact (4);
The handle (2) can drive the moving contact (4) to rotate through the transmission component (3) so as to be in contact with or separated from the static contact (5) to realize the closing or breaking of the circuit breaker; when the lock catch (6) and the connecting rod (30) are unlocked, the moving contact (4) is driven to rotate so as to be separated from the static contact (5) to realize the tripping of the circuit breaker.
2. The circuit breaker operating mechanism of claim 1 wherein: the laminated lock catch (6) and the moving contact (4) are rotatably arranged on the fulcrum shaft (12) to realize coaxial pivoting and are arranged in the shell (1), a first shaft hole (61) matched with the fulcrum shaft (12) is arranged on the lock catch (6), and a second shaft hole (41) matched with the fulcrum shaft (12) is arranged on the moving contact (4).
3. The circuit breaker operating mechanism of claim 2 wherein: the middle part of the connecting rod (30) is in driving connection with the handle (2), one end of the connecting rod (30) is in driving connection with the moving contact (4), and the other end of the connecting rod is in hasp connection with the lock catch (6).
4. The circuit breaker operating mechanism of claim 1 wherein: one side of the moving contact (4) is provided with the fixed contact (5) and the second spring (40), and the other side of the moving contact (4) is provided with a limiting shaft (13); the second spring (40) is a tension spring, one end of the second spring (40) is hooked on the mounting shaft (11) of the shell (1), and the other end of the second spring is hooked in the mounting hole (44) of the movable contact (4).
5. the circuit breaker operating mechanism of claim 1 wherein: the circuit breaker further comprises an electromagnetic system (7) and a bimetallic strip (9) which are arranged in the shell (1), wherein the electromagnetic system (7) comprises a striker (71) which is in touch fit with the triggering part (64) of the lock catch (6); the thermal tripping device of the circuit breaker comprises a pull rod (8) connected with the lock catch (6) and a bimetallic strip (9) matched with the pull rod (8) in a pulling way.
6. The circuit breaker operating mechanism of claim 5 wherein: one end of the lock catch (6) is in hasp connection with the connecting rod (30), the other end of the lock catch is provided with a pull rod hole (66) used for being connected with the pull rod (8), one side surface of the middle of the lock catch (6) is provided with the trigger part (64), and the other side of the middle of the lock catch is pivotally installed on the shell (1).
7. The circuit breaker operating mechanism of claim 1 wherein: the movable contact (4) is rotatably arranged on a fulcrum (12) of the shell (1) through a second shaft hole (41) on the movable contact, and the second shaft hole (41) is a waist-shaped hole with the length larger than the outer diameter of the fulcrum (12), so that the movable contact (4) can move relative to the fulcrum (12) along the length direction of the second shaft hole (41).
8. A method of assembling a circuit breaker operating mechanism, comprising: comprises the following steps:
a. the handle rotating shaft (15), the mounting shaft (11) and the fulcrum shaft (12) are respectively mounted on a bottom plate (10) of the shell (1);
b. a first spring (20) for resetting the handle (2) and the handle (2) are sequentially and rotatably arranged on a handle rotating shaft (15) of the shell (1);
c. the moving contact (4) is rotatably arranged on a fulcrum (12) of the shell (1);
d. One ends of a first lever (31) and a second lever (32) of the transmission assembly (3) which are positioned at the two ends are respectively inserted into a second lever hole (33) and a third lever hole (34) of the connecting rod (30); the transmission assembly (3) is installed on the handle (2) and the movable contact (4) in a stacking mode, the other end of the first lever (31) is inserted into a first lever hole of the handle (2), and meanwhile, two ends of the second lever (32) are respectively inserted into a fourth lever hole (42) and a fifth lever hole (43) of the movable contact (4), so that the handle (2) and the movable contact (4) are in driving connection;
e. One end of a second spring (40) for resetting the moving contact (4) is arranged on the mounting shaft (11) of the shell (1), and the other end of the second spring is arranged in a mounting hole (44) of the moving contact (4);
f. the lock catch (6) is rotatably arranged on a fulcrum (12) of the shell (1) and is stacked on the movable contact (4), and one end of the lock catch (6) is arranged opposite to the transmission component (3).
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| CN201710004224.3A CN108269719B (en) | 2017-01-04 | 2017-01-04 | Circuit breaker operating mechanism and assembly method thereof |
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| CN201710004224.3A CN108269719B (en) | 2017-01-04 | 2017-01-04 | Circuit breaker operating mechanism and assembly method thereof |
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| CN108269719B true CN108269719B (en) | 2019-12-06 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108878225B (en) * | 2018-07-13 | 2024-05-14 | 浙江正泰电器股份有限公司 | Circuit breaker |
| CN109256258A (en) * | 2018-11-15 | 2019-01-22 | 特变电工沈阳变压器集团有限公司 | A kind of distribution transforming transformer of overload protection type |
| CN110364397B (en) * | 2019-08-14 | 2024-03-29 | 环宇高科有限公司 | Moving contact assembly fixture |
| CN110853997B (en) * | 2019-10-24 | 2021-07-20 | 拉波斯电气(中国)有限公司 | Quick closing circuit breaker |
| CN110676130B (en) * | 2019-11-04 | 2021-09-07 | 王苏华 | Driving mechanism of miniature circuit breaker and control system and method thereof |
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| CN108269719A (en) | 2018-07-10 |
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