CN203445073U - Operation mechanism of double-breakpoint molded case circuit breaker - Google Patents

Abstract

An operating mechanism for a double breakpoint molded case circuit breaker, comprising a first positioning shaft, a second positioning shaft, a third positioning shaft, a fourth positioning shaft, a jumper assembly, a spring pin, an upper link, a lower link, Locking piece, draw bar, handle lever, driving shaft, main tension spring, contact system and two fixing plates, the first positioning shaft is fixed on the inside of the two fixing plates, and the second positioning shaft is rotatably connected to the two On the inner side of the fixed plate, the jumper assembly is rotatably arranged on the second positioning shaft, and the first positioning shaft is located at the rear upper side of the jumper assembly. The first positioning shaft and the five-link structure can provide the molded case circuit breaker with the ability to accelerate the disconnection speed without increasing the pressure of the contact system and the tension of the main tension spring while ensuring the normal operation of the mechanism. . The utility model is conducive to accelerating the breaking speed of the circuit breaker mechanism, improving the breaking capacity and electrical life of the circuit breaker, reducing the number of parts of the mechanism and facilitating assembly.

Description

Operating Mechanism of Double Breakpoint Molded Case Circuit Breaker

Technical field:

The utility model relates to the field of electricity, in particular to an operating mechanism of a circuit breaker, in particular to an operating mechanism of a double break point molded case circuit breaker.

Background technique:

In the prior art, the operating mechanism of the molded case circuit breaker (hereinafter referred to as the "mechanism") is composed of side plates, upper connecting rods, lower connecting rods, jumpers, drawbars, locks, positioning shafts, handle levers and other components. constitute. Among them, the size distribution of the five-link system of the mechanism, the tension of the main tension spring, and the pressure of the contact system all affect the breaking speed of the mechanism. In particular, the driving force provided by the main tension spring to disconnect the mechanism can increase the disconnection speed of the mechanism by increasing the effective tension of the main tension spring, but too much tension will cause:

①. The re-deduction force of the mechanism increases, thereby increasing the electric or manual operating force, which is inconvenient to operate;

②. The limited space size of the mechanism determines the limited pulling force;

③. It will greatly reduce the fatigue strength of the spring and affect its life. It is also possible to increase the recovery force of the mechanism by reducing the pressure of the moving contact of the contact system, thereby increasing the disconnection speed of the mechanism, but if the pressure of the contact system is too small, it will increase the temperature rise of the circuit breaker and reduce the electrical resistance of the circuit breaker. life.

Chinese patent CN102034652A discloses an accelerated breaking device, including a jumper (single plate), a single torsion spring, and a U-shaped jumper limiter. The rotation center of the torsion spring is the same as that of the jumper, and the torsion spring is located at On one side, only the single breakpoint molded case circuit breaker is shown. The disadvantage is that: more parts are required, and it is easy to realize because of the large space of the single breakpoint molded case circuit breaker, and the space of the double breakpoint molded case circuit breaker Relatively small and difficult to implement. A double-break point molded case product of GE has an accelerated breaking mechanism, including a jumper (single plate), a U-shaped transmission lever, and a single torsion spring. In addition to the function of accelerating breaking, this structure can also provide a handle lever. One force ensures that the handle lever can be in the reset state; the rotation centers of the three parts of the jumper, the U-shaped transmission lever, and the torsion spring are concentric. lower.

Chinese patent CN202585283U discloses a reset mechanism for a double-breakpoint circuit breaker, including a U-shaped jumper and a reset torsion spring. The disadvantages are: more parts are required, the cost is higher, and the assembly is more complicated.

Invention content:

The purpose of this utility model is to provide an operating mechanism of a double breakpoint molded case circuit breaker. The operating mechanism of the double breakpoint molded case circuit breaker needs to solve the complex structure of the circuit breaker operating mechanism in the prior art. The technical problems of large number of parts, high cost, and difficulty in improving the disconnection speed.

The operating mechanism of the double breakpoint molded case circuit breaker of the utility model includes a first positioning shaft, a second positioning shaft, a jumper assembly and two fixing plates, and the two fixing plates are arranged in parallel , wherein, the first positioning shaft is fixed on the inner side of the two fixing plates, the second positioning shaft is rotatably connected on the inner side of the two fixing plates, and the jumper assembly is rotatable It is arranged on the second positioning shaft, and the first positioning shaft is located on the rear upper side of the jumper assembly. the

Further, it includes a spring pin, an upper link and a lower link, the two ends of the first positioning shaft are respectively provided with a positioning step, the fixing plate is fixed on the positioning step, the The jumper assembly includes a jumper and a pivot pin, the pivot pin is fixed on the inner side of the jumper, the upper link is hinged on the pivot pin, and the lower link passes through the spring pin Hinged with the upper link.

Further, it includes a handle lever, a drive shaft and a main extension spring, the handle lever is rotatably set on the fixed plate, the drive shaft is rotatably set on the handle lever, the One end of the main extension spring is arranged on the rear top of the handle lever, and the other end of the main extension spring is arranged on the spring pin.

Further, it includes a third positioning shaft, a fourth positioning shaft, a locking member and a draw bar, the third positioning shaft and the fourth positioning shaft are connected to the inner side of the two fixing plates, the The locking member is rotatably arranged on the third positioning shaft, and the traction rod is rotatably arranged on the fourth positioning shaft.

Further, it includes a contact system, the contact system includes a moving contact, a first static contact, a second static contact and a housing, the moving contact, the first static contact, the second The static contacts are all fixed in the housing.

Further, the two fixing plates and the housing are provided with matching holes, and the positioning shafts are arranged in the matching holes, and the positioning shafts run through the two-pole, three-pole or four-pole contact system .

Further, the moving contact is hinged to the lower link through a linkage shaft.

Further, the lower front end of the jumper is provided with a boss, and the middle part of the lock is provided with a square hole.

Further, a torsion spring is arranged between the traction rod and the fourth positioning shaft.

Further, the handle lever is rotatably straddled on the fixed plate.

Further, the two fixing plates are arranged symmetrically. The quantity of the main extension spring is two pieces or one piece.

The working principle of the utility model is: when the handle lever is turned clockwise manually (or electrically), the drive shaft can rotate to press the jumper, and the jumper rotates clockwise with the second positioning axis as the rotation center; when it is turned to a certain angle, The lower boss at the front end of the jumper pushes the locker, and the locker rotates counterclockwise around the third positioning axis, and the buckle surface at the front end of the jumper enters the square hole in the middle of the locker; The four positioning shafts are the center, and they rotate counterclockwise under the action of the torsion spring that provides counterclockwise rotation torque. When the handle lever is turned to the re-buckle (disconnect) position, the buckle and the drawbar are completely buckled, and the jump buckle and the lock The buckle is also fully snapped and the mechanism is in the re-buckled (off) position.

When the drawbar is turned clockwise by hand, the buckle surface between the lock catch and the drawbar decreases gradually. When the buckle surface decreases to 0, the lock buckle rotates clockwise because it is always in a clockwise trend, and the mechanism increases a freedom. degree, from a four-bar linkage mechanism to a five-bar linkage mechanism. At the same time, the jumper turns counterclockwise under the action of the main tension spring to break away from the buckle, and the buckle surface of the two immediately becomes 0, that is, the buckle is released; finally, The rear end of the jumper is restricted by the first positioning shaft, the jumper does not rotate anymore, and the rear end of the upper link is also restricted by the first positioning shaft at the same time, and the handle lever is driven by the drive shaft under the action of the main tension spring force. Constrained to the jumper, at a complete standstill. The mechanism is in the free trip position, and the moving contact is always in the disconnected position during this process.

When the mechanism is in the re-buckle (disconnected) position, the jumper is in a static state, and the handle lever is manually (or electrically) turned counterclockwise to drive the main tension spring to store energy. The main tension spring pulls the upper link through the spring pin, and the upper link The rod rotates clockwise around the shaft pin. When the action line of the main tension spring force exceeds the center line of the upper link, the mechanism passes the dead point, and the upper link rotates until it is restricted by the first positioning shaft and stops, and at the same time drives the lower link , the lower connecting rod drives the moving contact through the linkage shaft, and the moving contact rotates counterclockwise from the disconnected position to fully contact with the static contact, and the handle lever also stops on the fixed plate and no longer rotates. The mechanism is in the closed position. The fixed plate is two symmetrical pieces, and the quantity of the main tension spring is two pieces or one piece.

When the mechanism is in the closed position, when the drawbar is turned clockwise by hand, the buckle surface of the lock catch and the drawbar will gradually decrease and the buckle will be released, the jumper buckle and the lock buckle will be released, and the main tension spring will drive the upper and lower connecting rods And the action of the moving contact, the moving contact is opened to the disconnected position, and the handle lever is reset, which is the free tripping position of the mechanism.

The utility model improves the breaking speed of the mechanism, and by comparing the results of the simulation analysis of the mechanisms with different structures under the same contact pressure condition, it can be seen that the breaking time of the mechanism can be relatively shortened by more than 10%. For a four-pole circuit breaker, this mechanism can be set on phase A (from left to right, phase N, phase A, phase B, and phase C), or on phase B, or on two phases A-B; For a three-pole circuit breaker, set it on phase B; for a two-pole circuit breaker, set it on phase A or B.

Compared with the prior art, the utility model has positive and obvious effects. The utility model adopts a five-link structure in the operating mechanism of the double-break point molded case circuit breaker. Under the condition of ensuring the normal operation of the mechanism, the disconnection can be accelerated without increasing the pressure of the contact system and the tension of the main tension spring. Molded case circuit breaker with high speed, the utility model is conducive to accelerating the breaking speed of the circuit breaker mechanism, improving the breaking capacity and electrical life of the circuit breaker, reducing the number of parts of the mechanism, and facilitating assembly.

Description of drawings:

Figure 1 is a structural schematic diagram of the operating mechanism of the double breakpoint molded case circuit breaker of the present invention.

Fig. 2 is a schematic view of an embodiment of the operating mechanism of the double breakpoint molded case circuit breaker of the present invention.

Fig. 3 is a schematic structural diagram of the operating mechanism in the closed state in the embodiment of Fig. 2 .

Fig. 4 is a schematic structural diagram of the operating mechanism in the disconnected state in the embodiment of Fig. 2 .

Fig. 5 is a structural schematic diagram of the operating mechanism in the free tripping state in the embodiment of Fig. 2 .

Fig. 6 is a schematic view of another embodiment of the operating mechanism of the double breakpoint molded case circuit breaker of the present invention.

Detailed ways:

Example 1:

As shown in Figure 1, Figure 2, Figure 3, Figure 4 and Figure 5, the operating mechanism of the double breakpoint molded case circuit breaker of the present invention includes a fixed plate 1, a first positioning shaft 2, and a second positioning shaft 3 , the third positioning shaft 4, the fourth positioning shaft 5, the jumper assembly 6, the spring pin 7, the upper link 8, the lower link 9, the lock piece 10, the draw bar 11, the handle lever 12, the drive shaft 13, the main The tension spring 14 and the contact system 15, the first positioning shaft 2 is fixed on the inside of the two fixed plates 1, the first positioning shaft 2 is arranged at the rear upper end of the jumper assembly 6, and the second positioning shaft 3 is rotatably connected On the inside of the two fixed plates 1, the jumper assembly 6 is rotatably arranged on the second positioning shaft 3. The jumper assembly 6 includes a jumper 61 and a pivot pin 62. The pivot pin 62 is fixed on the inner side of the jumper 61. The connecting rod 8 is hinged on the shaft pin 62, the lower connecting rod 9 is hinged with the upper connecting rod 8 through the spring pin 7, the handle lever 12 is rotatably arranged on the fixed plate 1, and the drive shaft 13 is rotatably arranged on the handle lever 12 , one end of the main tension spring 14 is set on the rear top of the handle lever 12, the other end of the main tension spring 14 is set on the spring pin 7, and the third positioning shaft 4 and the fourth positioning shaft 5 are connected to the inside of the two fixing plates 1 , the locking member 10 is rotatably set on the third positioning shaft 4, the drawbar 11 is rotatably set on the fourth positioning shaft 5, and the contact system 15 includes a moving contact 151, a first static contact 152, a second Two static contacts 153, housing 154, linkage shaft 16 and positioning shaft 17 connecting the operating mechanism and the contact system, the moving contact 151, the first static contact 152, and the second static contact 153 are fixed in the housing 154 , the moving contact 151 is hinged with the lower link 9 through the linkage shaft 16, the positioning shaft 17 is set in the matching hole of the fixed plate 1 and the housing 154, the lower part of the front end of the jumper 61 is provided with a boss, and the middle part of the lock piece 10 is provided with Square hole.

Further, both ends of the first positioning shaft 2 are provided with positioning steps, and the fixing plate 1 is fixed on the steps. the

Further, the positioning shaft 17 runs through the contact system, and the contact system is a two-pole, three-pole or four-pole contact system.

Further, the number of main extension springs 14 is one piece or two pieces arranged side by side in parallel.

Further, a torsion spring (not shown in the figure) is provided between the traction rod 11 and the fourth positioning shaft 5 .

The working principle of embodiment 1 is:

When manually (or electrically) turning the handle lever 12 clockwise, the drive shaft 13 is rotatable against the jumper 61, and the jumper 61 rotates clockwise with the second positioning axis 3 as the center of rotation; when turned to a certain angle, the jumper 61 The lower boss at the front end pushes the lock piece 10, and the lock piece 10 rotates counterclockwise around the third positioning axis 4, and the buckle surface at the front end of the jumper 61 enters the square hole in the middle of the lock piece 10; , the traction rod 11 is centered on the fourth positioning axis 5, and when the handle lever 12 is turned to the re-buckle (disconnected) position, the locking member 10 is completely engaged with the traction rod 11, and the jumper 61 is completely engaged with the lock. Buckle, this is the re-buckle (disconnect) position of the mechanism, as shown in Figure 3.

When the drawbar 11 is rotated clockwise by hand, the buckle surface of the lock piece 10 and the drawbar 11 gradually decreases, and when the buckle surface decreases to 0, the lock piece 10 is always in a clockwise direction. rotation; the mechanism changes from a four-bar linkage to a five-bar linkage due to one more degree of freedom. surface immediately becomes 0, that is, tripping; finally, the rear end of the jumper 61 is limited by the first positioning shaft 2, the jumper 61 no longer rotates, and the rear end of the upper link 8 is also limited by the first positioning shaft 2 at the same time. Live no longer rotate, handle lever 12 is under the effect of main extension spring 14, is limited on jumper 61 by drive shaft 13, is in complete stillness. This is the free trip position of the mechanism, as shown in Figure 1 and Figure 5, during which the movable contact 151 is always in the disconnected position.

When the mechanism is in the re-buckle (disconnected) position, the jumper 61 is in a static state, and the handle lever 12 is manually (or electrically) turned counterclockwise to drive the main tension spring 14 to store energy, and the main tension spring 14 is pulled up by the spring pin 7 The connecting rod 8 and the upper connecting rod 8 rotate clockwise around the shaft pin 62. When the line of action of the force of the main tension spring 14 exceeds the center line of the upper connecting rod 8, the mechanism passes the dead point, and the upper connecting rod 8 rotates to be positioned by the first position. The shaft 2 is limited and stopped, and drives the lower connecting rod 9 at the same time, and the lower connecting rod 9 drives the moving contact 151 through the linkage shaft 16 for linkage, and the moving contact 151 rotates counterclockwise from the disconnected position to the first static contact 152, The second static contact 153 is in full contact, and the handle lever 12 also stops on the fixed plate 1 and no longer rotates. This is the closed position of the mechanism.

When the mechanism is in the closed position, when the drawbar 11 is rotated clockwise by hand, the buckle and the buckle surface of the drawbar 11 will gradually decrease and be released, the jumper 61 and the lock will be released, and the main tension spring 14 will drive the upper , The lower connecting rod 9 and the movable contact 151 move, the movable contact 151 is opened to the disconnected position, and the handle lever 12 resets, which is the free tripping position of the mechanism.

The operating mechanism of this circuit breaker can increase the breaking speed of the mechanism. Through the comparison of the results of the simulation analysis of the different structures of the mechanism under the same contact pressure Relatively shortened by more than 10%. For a four-pole circuit breaker, this mechanism can be set on phase A (from left to right: phase N, phase A, phase B, phase C) or phase B; for a three-pole circuit breaker, it can be set on phase B ; For a two-pole circuit breaker, set it to phase A or phase B.

Example 2:

As shown in Figure 6, the structure in embodiment 2 is basically the same as embodiment 1, the difference is that in embodiment 2, the handle lever 12, the upper link 8, the draw bar 11, the spring pin 7, the first positioning shaft 2, The specific structure of the second positioning shaft 3, the third positioning shaft 4, the fourth positioning shaft 5, and the driving shaft 13. As shown in Figure 6, the fixed plate 1 is arranged on both sides of the two unit boxes in the middle, and the handle lever 12 is arranged on the fixed plate 1 across the two pole unit boxes; , the spring pin 7, the first positioning shaft 2, the second positioning shaft 3, the third positioning shaft 4, the fourth positioning shaft 5, and the width of the drive shaft 13 are wider than in the first embodiment, and can be adjusted according to actual needs. This mechanism For a four-pole circuit breaker, it is preferably arranged on the A-phase-B-phase two-pole unit box; for a two-pole and three-pole circuit breaker, its location is the same as that in Embodiment 1.

In addition, the structure design of the first positioning axis 2 and the second positioning axis 3 can also be changed, or the single axis can be divided into two axes to realize the function, or the number of the first positioning axis 2, Adjust the position to achieve the above functions.

In the circuit breaker operating mechanism of the utility model, the first positioning shaft 2 and the five-link structure can be provided to the molded case circuit breaker without increasing the pressure of the contact system and the main tension spring 14 while ensuring the normal operation of the mechanism. The pulling force and the ability to accelerate the disconnection speed.

The operating mechanism of the circuit breaker of the present utility model has been introduced in detail above. For those skilled in the art, according to the ideas of the embodiments of the present utility model, the specific implementation and application scope may be changed. Therefore, the content of this specification only It is used to illustrate the embodiment of the utility model, and should not be understood as a limitation of the utility model, and any changes made according to the design concept of the utility model are within the protection scope of the utility model.

Claims (10)

1. An operating mechanism for a double breakpoint molded case circuit breaker, comprising a first positioning shaft, a second positioning shaft, a jumper assembly and two fixing plates, the two fixing plates are arranged in parallel, and It is characterized in that: the first positioning shaft is fixed on the inner side of the two fixing plates, the second positioning shaft is rotatably connected on the inner side of the two fixing plates, and the jumper assembly is rotatable It is arranged on the second positioning shaft, and the first positioning shaft is located on the rear upper side of the jumper assembly. 2. The operating mechanism of double breakpoint molded case circuit breaker as claimed in claim 1, characterized in that it comprises a spring pin, an upper link and a lower link, and the two ends of the first positioning shaft Each is provided with a positioning step, the fixing plate is fixed on the positioning step, the jumper assembly includes a jumper and a pivot pin, the pivot pin is fixed on the inner side of the jumper, the The upper link is hinged on the pivot pin, and the lower link is hinged with the upper link through the spring pin. 3. The operating mechanism of the double breakpoint molded case circuit breaker according to claim 2, characterized in that it comprises a handle lever, a drive shaft and a main tension spring, and the handle lever is rotatably arranged on the On the fixed plate, the drive shaft is rotatably arranged on the handle lever, one end of the main extension spring is arranged on the rear top of the handle lever, and the other end of the main extension spring is arranged on the spring pin. 4. The operating mechanism of the double break point molded case circuit breaker according to claim 2, characterized in that it comprises a third positioning shaft, a fourth positioning shaft, a locking member and a draw bar, the said The third positioning shaft and the fourth positioning shaft are connected to the inner side of the two fixing plates, the lock catch is rotatably arranged on the third positioning shaft, and the described drawbar is rotatably arranged on the fourth on the positioning axis. 5. The operating mechanism of the double breakpoint molded case circuit breaker according to claim 2, characterized in that it includes a contact system, and the contact system includes a moving contact, a first static contact, a second The static contact and the housing, the moving contact, the first static contact and the second static contact are all fixed in the housing. 6. The operating mechanism of the double breakpoint molded case circuit breaker according to claim 5, characterized in that: the two fixing plates and the housing are provided with matching holes, and the matching holes A positioning shaft is arranged in the middle, and the positioning shaft runs through the two-pole, three-pole or four-pole contact system. 7. The operating mechanism of the double breakpoint molded case circuit breaker according to claim 5, wherein the moving contact is hinged to the lower connecting rod through a linkage shaft. 8. The operating mechanism of the double breakpoint molded case circuit breaker according to claim 4, characterized in that: the lower front end of the jumper is provided with a boss, and the middle part of the locker is provided with a square hole . 9. The operating mechanism of the double-breakpoint molded case circuit breaker as claimed in claim 4, characterized in that: a torsion spring is arranged between the draw bar and the fourth positioning shaft. 10. The operating mechanism of the double breakpoint molded case circuit breaker according to claim 3, wherein the handle lever is rotatably mounted on the fixed plate.

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