CN215869220U

CN215869220U - Operating mechanism of universal circuit breaker

Info

Publication number: CN215869220U
Application number: CN202121143686.1U
Authority: CN
Inventors: 王江涛; 辛娜; 卢志刚; 徐柏超; 秦治斌; 白晓峰; 戴铭磊; 李兴文
Original assignee: Shanghai Chint Intelligent Technology Co Ltd
Current assignee: Shanghai Chint Intelligent Technology Co Ltd
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2022-02-18
Anticipated expiration: 2031-05-26

Abstract

The utility model provides an operating device of universal circuit breaker, its includes energy storage mechanism, third connecting rod, second connecting rod and two first connecting rods of relative setting in second connecting rod both sides, connects through first lever between two first connecting rods, and energy storage mechanism can promote first connecting rod and rotate, makes first connecting rod promote the second connecting rod and drive the third connecting rod and rotate, through the closing of third connecting rod drive moving contact, first lever is used for spacingly including the back shaft that is the cylinder structure and setting up respectively at the back shaft both ends the limit structure of first connecting rod, two limit structure become around with the back shaft respectively and dodge the groove, connect between two limit structure through the back shaft of cylinder structure, not only have the characteristics of processing convenience and low cost, but also have intensity height and longe-lived characteristics.

Description

Operating mechanism of universal circuit breaker

Technical Field

The utility model relates to the field of low-voltage electrical appliances, in particular to an operating mechanism of a universal circuit breaker.

Background

Conventional circuit breakers are often used to control the make and break of circuits and to break the circuit in case of a fault, achieving a protective function. The universal circuit breaker is mainly realized by an operating mechanism when acting, an energy storage mechanism of the operating mechanism is firstly compressed, then the energy storage mechanism is locked in a compressed state by a connecting rod mechanism, when the operating mechanism needs to act, the connecting rod mechanism is unlocked and the energy storage mechanism is released, the energy storage mechanism pushes the connecting rod mechanism in the energy release process, and the universal circuit breaker is driven to act by the connecting rod mechanism.

However, the structure of the link mechanism is too complex, and the link mechanism not only needs to move at a high speed in the whole action process, but also needs to bear large acting force and reaction force, so that the link mechanism is easy to damage and has a short service life.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provides an operating mechanism of a universal circuit breaker, which has a simple structure and high reliability.

In order to achieve the purpose, the utility model adopts the following technical scheme:

an operating mechanism of a universal circuit breaker comprises an energy storage mechanism, a third connecting rod, a second connecting rod and two first connecting rods which are oppositely arranged on two sides of the second connecting rod, wherein the two first connecting rods are connected through a first lever;

the first lever comprises a supporting shaft in a cylindrical structure and limiting structures which are arranged at two ends of the supporting shaft respectively and are used for limiting the first connecting rod, and the two limiting structures and the surrounding of the supporting shaft respectively form avoiding grooves.

Preferably, the bird head striking device further comprises a bird head lever connected with the second connecting rod, and a striking shaft arranged on one side of the bird head lever, wherein a return spring for returning the bird head lever is arranged on the striking shaft.

Preferably, reset spring is the torsional spring structure, and reset spring cover is on the beating axle, reset spring's one end with bird head lever connection, reset spring's the other end and curb plate are connected.

Preferably, the joints of the support shaft and the two limiting structures are respectively provided with a round angle.

Preferably, the third connecting rod is provided with a shaft hole matched with the shaft pin, the inner side of the shaft hole is provided with a sleeve, and the shaft pin penetrates through the sleeve to be connected with the cantilever on the main shaft.

Preferably, the quantity of second connecting rod is two, and the one end of two second connecting rods is equipped with respectively with second lever complex second connecting hole, and the other end of two second connecting rods is equipped with respectively with second axle round pin complex third connecting hole, and the second axle round pin is connected with the third connecting rod, and the middle part of two second connecting rods is equipped with respectively with fourth lever complex fourth connecting hole, through fourth lever connection between two second connecting rods, the second connecting rod is equipped with the second that is used for dodging the second connecting rod on the side between second connecting hole and fourth connecting hole and dodges the groove.

Preferably, the two limiting structures respectively comprise a limiting shaft and a connecting shaft arranged on the outer side of the limiting shaft, the inner sides of the two limiting shafts are respectively connected with the two ends of the supporting shaft, and the diameter of the supporting shaft is smaller than that of the limiting shaft and larger than that of the connecting shaft.

Preferably, the number of the third connecting rods is two, the third connecting rods are of arc structures, one end of each third connecting rod is provided with a shaft hole matched with the shaft pin, the inner wall of each shaft hole is flanged outwards to form a sleeve, the other end of each third connecting rod is provided with a second shaft hole and a third shaft hole, the second shaft hole is connected with the second connecting rod through a second shaft pin, and the third shaft hole is connected with the other third connecting rod through a third shaft pin.

Preferably, the sleeve has a thickness of 2mm, an inner diameter of 3.5mm and an outer diameter of 5 mm.

Preferably, the radius of the support shaft 212 is 3.5 mm.

The operating mechanism of the universal circuit breaker is connected between the two limiting structures through the supporting shaft of the cylindrical structure, and has the characteristics of convenience in processing and low cost, and also has the characteristics of high strength and long service life.

In addition, through connecting reset spring on the striking axle, need not connect between first lever and second lever, also need not set up boss structure and the groove structure who is used for connecting reset spring just also on first lever, not only can reliably drive bird head lever and reset, but also can avoid first lever and second connecting rod to interfere.

Drawings

Fig. 1 is a schematic structural view of an operating mechanism of a conventional circuit breaker;

fig. 2 to 5 are closing processes of an operating mechanism of a conventional circuit breaker;

fig. 6 is a schematic structural view of an operating mechanism of the universal circuit breaker of the present invention;

FIG. 7 is a schematic view of a second link according to the present invention;

FIG. 8 is a schematic diagram of a first lever of the prior art;

FIG. 9 is a stress cloud of a first lever of the prior art;

FIG. 10 is a schematic view of the first lever of the present invention;

FIG. 11 is a stress cloud of a first lever of the present invention;

FIG. 12 is a schematic view of a prior art third link;

FIG. 13 is a stress cloud of a third prior art link;

FIG. 14 is a schematic view of the third link of the present invention;

FIG. 15 is a stress cloud for the third link of the present invention.

Detailed Description

The following describes a specific embodiment of the operating mechanism of the universal circuit breaker according to the present invention with reference to the embodiments shown in fig. 1 to 15. The operating mechanism of the universal circuit breaker of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1-6 and 10, the operating mechanism of the universal circuit breaker of this embodiment includes an energy storage mechanism, a third connecting rod 13, a second connecting rod 12, and two first connecting rods 11 oppositely disposed at two sides of the second connecting rod 12, the two first connecting rods 11 are connected by a first lever 21, the energy storage mechanism can push the first connecting rod 11 to rotate, so that the first connecting rod 11 pushes the second connecting rod 12 to drive the third connecting rod 13 to rotate, and the moving contact 31 is driven to close the switch by the third connecting rod 13; the first lever 21 comprises a supporting shaft 212 with a cylindrical structure and limiting structures 211 arranged at two ends of the supporting shaft 212 respectively and used for limiting the first connecting rod 11, wherein the two limiting structures 211 respectively avoid the grooves 213 with the periphery of the supporting shaft 212.

The operating mechanism of the universal circuit breaker is connected between the two limiting structures 211 through the supporting shaft 212 with the cylindrical structure, and has the characteristics of convenience in processing and low cost, and also has the characteristics of high strength and long service life.

As shown in fig. 1, the first link 11, the second link 12, and the third link 13 form a link mechanism, the energy storage mechanism includes an energy storage spring (not shown in the figure) and a positioning structure 33 for limiting the energy storage spring, the movable contact 31 is connected with the main shaft 34 through a cantilever, and the main shaft 34 is provided with a cantilever 35 connected with the third link 13.

As shown in fig. 2-5, which illustrates a closing process of the operating mechanism, fig. 2 illustrates that the operating mechanism is in an energy storage position, the energy storage spring is locked in a compressed state, the compressed energy storage spring can be released by unlocking the energy storage spring, the energy storage spring pushes the first connecting rod 11 to rotate in the releasing process, the first connecting rod 11 drives the second connecting rod 12 to rotate through the first lever 21 when rotating, the second connecting rod 12 drives the third connecting rod 13 to rotate through the second lever 22 when rotating, the third connecting rod 13 drives the main shaft 34 to rotate through the cantilever 35 when rotating, and the main shaft 34 drives the movable contact 31 to move, so as to perform a closing operation;

as shown in fig. 3, in the closing process, when the movable contact 31 contacts the fixed contact 32, the operating mechanism continues to move under the action of the energy storage mechanism, and the operating mechanism moves to the closing position of fig. 5 after passing through the dead point position shown in fig. 4, when the dead point position shown in fig. 4 is reached, the link mechanism and the energy storage mechanism of the operating mechanism will receive the reaction force of the movable contact 31 and the fixed contact 32, and when the closing position shown in fig. 5 is reached, only the link mechanism of the operating mechanism receives the reaction force of the movable contact 31 and the fixed contact 32, and the link mechanism not only needs to move at a high speed in the whole process, but also needs to receive a large reaction force and a large reaction force.

As shown in fig. 1 and 7, the operating mechanism further includes a bird head lever 14 connected to the second link 12, and a striking shaft 23 provided on one side of the bird head lever 14, and a return spring 24 for returning the bird head lever 14 is provided on the striking shaft 23.

Specifically, the number of the second connecting rods 12 is two, one end of each of the two second connecting rods 12 is provided with a second connecting hole 122 matched with the second lever 22, the other end of each of the two second connecting rods 12 is provided with a third connecting hole 123 matched with the second shaft pin 232, the middle parts of the two second connecting rods 12 are provided with fourth connecting holes 124 matched with a fourth lever (not shown in the figure), the two second connecting rods 12 are connected with each other through the fourth lever, the second connecting rods 12 are connected with the third connecting rod 13 through the second shaft pin 232, and the second connecting rods 12 are provided with second avoiding grooves 121 for avoiding the second levers 21 on the side edges between the second connecting holes 122 and the fourth connecting holes 124; one end of the bird head lever 14 of the operating mechanism extends between the second connecting holes 122 of the two second connecting rods 12, the second lever 22 passes through the two second connecting rods 12 and the bird head lever 14, and both ends of the second lever 22 are located at the outer sides of the two second connecting rods 12 and are connected with the return spring 24.

The return spring 24 of the present embodiment is connected to the striking shaft 23, and does not need to be connected between the first lever 21 and the second lever 22, and also does not need to provide the boss structure 1 and the groove structure 2 (fig. 8-9) for connecting the return spring 24 on the first lever 21 as in the prior art, which not only can reliably drive the bird head lever 14 to return, but also can avoid the interference between the first lever 21 and the second connecting rod 12. In particular, the second escape groove 121 can be made deeper, and the diameter of the support shaft 212 can be increased to further increase the strength of the support shaft 212 while ensuring that the second link 12 does not interfere with the second lever 21. It is understood that other shafts may be disposed on the side plate 20 instead of the striking shaft 23 connected to the return spring 24, and all fall within the scope of the present invention.

Further, the return spring 24 is a torsion spring structure, the return spring 24 is sleeved on the striking shaft 23, one end of the return spring 24 is connected with the bird head lever 14, and the other end of the return spring 24 is connected with the side plate 20. Of course, the return spring 24 may also be a tension spring structure, but the tension spring structure occupies a small space and is more convenient to mount.

As shown in fig. 10, the first lever 21 of the present embodiment includes two limit structures 211 connected to the two first links 11, respectively, and a support shaft 212 connected between the two limit structures 211.

Specifically, the two limiting structures 211 respectively include a limiting shaft 214 and a connecting shaft 215 arranged on the outer side of the limiting shaft 214, the inner sides of the two limiting shafts 214 are respectively connected with two ends of the supporting shaft 212, the diameter of the supporting shaft 212 is smaller than that of the limiting shaft 214 and larger than that of the connecting shaft 215, the cross section of the two limiting shafts 214 connected with the supporting shaft 212 is in an H-shaped structure, and fillets 216 are respectively arranged at the connecting positions of the supporting shaft 212 and the two limiting structures 211. Preferably, the radius of the support shaft 212 is 3.5 mm.

As shown in fig. 11, which shows a stress cloud calculated based on Ansys apdl and Adams platform simulations, the strain of the first lever 21 in this embodiment is mainly distributed at the positions of the supporting shaft 212 in the middle and the rounded corners 216 at both ends of the supporting shaft 212, which are respectively connected with the limiting structures 211, and the stress calculation result is shown in the following table one, wherein the strain is 0.00338545 at maximum, and the fatigue life is 6808 times.

Watch 1

Fig. 8 shows a stress cloud calculated based on Ansys apdl and Adams platform simulations, fig. 9 shows the stress cloud calculated by the prior art first lever 21, wherein the strain is mainly distributed at the positions of the boss structure 1 at the middle part and the groove structures 2 at both sides, and the stress calculation result is shown in the following table two, wherein the strain is 0.00346212 at most and the fatigue life is 6051 times.

Watch two

According to simulation calculation results, when the first lever 21 is subjected to smoothing treatment, the boss structure 1 and the groove structure 2 are eliminated, the stress borne by the first lever 21 is reduced, and the mechanical fatigue life can be effectively prolonged.

As shown in fig. 14, the third link 13 of the present embodiment is provided with a shaft hole 131 engaged with the shaft pin 231, a sleeve 130 is provided inside the shaft hole 131, and the shaft pin 231 passes through the sleeve 130 and is connected to the cantilever 35 on the main shaft 34. In this embodiment, the sleeve 130 is disposed in the shaft hole 131, so that the contact area between the shaft hole 131 and the shaft pin 231 can be increased, the stress on the third link 13 can be reduced, and the effect of improving the fatigue life of the machine can be achieved.

Specifically, the number of the third connecting rods 13 is two, the third connecting rods 13 are in an arc structure, one end of each third connecting rod 13 is provided with a shaft hole 131 matched with the shaft pin 231, the inner wall of each shaft hole 131 is flanged outwards to form a sleeve 130, the shaft pin 231 penetrates through the sleeve 130 to be connected with the cantilever 35 on the main shaft 34, the other end of each third connecting rod 13 is provided with a second shaft hole 132 and a third shaft hole 133, the second shaft hole 132 is connected with the second connecting rod 12 through a second shaft pin 232, and the third shaft hole 133 is connected with the other third connecting rod 13 through a third shaft pin 233. Preferably, the sleeve 130 has a thickness of 2mm, an inner diameter of 3.5mm and an outer diameter of 5 mm.

As shown in fig. 15, which shows a stress cloud calculated based on Ansys apdl and Adams platform simulations, the strain of the third link 13 of the present embodiment is mainly distributed at the position of the second axle hole 132, and the stress calculation result is shown in table three below, where the strain is 0.001241 at maximum and the fatigue life is 9332 times.

Watch III

Fig. 12 shows a stress cloud calculated based on Ansys apdl and Adams platform simulations, and fig. 13 shows the stress cloud calculated by the prior art third connecting rod 13, wherein the strain is distributed not only at the second axial hole 132 but also at the axial hole 131, and the stress calculation result is as shown in the following table four, wherein the strain is 0.001749 at most and the fatigue life is 7581 times.

The simulation calculation result shows that the sleeve 130 can increase the contact area between the shaft hole 131 and the shaft pin 231, the stress applied to the third connecting rod 13 is reduced, and the mechanical fatigue life can be effectively increased.

Watch four

The foregoing is a more detailed description of the utility model in connection with specific preferred embodiments and it is not intended that the utility model be limited to these specific details. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.

Claims

1. An operating mechanism of universal circuit breaker, its characterized in that: the energy storage mechanism can push the first connecting rods (11) to rotate, so that the first connecting rods (11) push the second connecting rods (12) to drive the third connecting rods (13) to rotate, and the moving contacts (31) are driven to be switched on through the third connecting rods (13);

first lever (21) are used for spacingly including being cylindrical structure's back shaft (212) and setting up respectively at back shaft (212) both ends limit structure (211) of first connecting rod (11), two limit structure (211) become around dodging groove (213) with back shaft (212) respectively.

2. The operating mechanism of the conventional circuit breaker according to claim 1, wherein: the bird head adjusting mechanism further comprises a bird head lever (14) connected with the second connecting rod (12) and a striking shaft (23) arranged on one side of the bird head lever (14), and a return spring (24) used for returning the bird head lever (14) is arranged on the striking shaft (23).

3. The operating mechanism of the conventional circuit breaker according to claim 2, wherein: reset spring (24) are the torsional spring structure, and reset spring (24) cover is on hitting axle (23), the one end of reset spring (24) with bird head lever (14) are connected, and the other end and curb plate (20) of reset spring (24) are connected.

4. The operating mechanism of the conventional circuit breaker according to claim 1, wherein: and the joint of the support shaft (212) and the two limiting structures (211) is respectively provided with a fillet (216).

5. The operating mechanism of the conventional circuit breaker according to claim 1, wherein: and the third connecting rod (13) is provided with a shaft hole (131) matched with the shaft pin (231), the inner side of the shaft hole (131) is provided with a sleeve (130), and the shaft pin (231) penetrates through the sleeve (130) to be connected with a cantilever (35) on the main shaft (34).

6. The operating mechanism of the conventional circuit breaker according to claim 1, wherein: the quantity of second connecting rod (12) is two, and the one end of two second connecting rod (12) is equipped with respectively with second lever (22) complex second connecting hole (122), and the other end of two second connecting rod (12) is equipped with respectively with second axle pin (232) complex third connecting hole (123), and second axle pin (232) are connected with third connecting rod (13), and the middle part of two second connecting rod (12) is equipped with respectively with fourth lever complex fourth connecting hole (124), through fourth lever connection between two second connecting rod (12), second connecting rod (12) are equipped with on the side between second connecting hole (122) and fourth connecting hole (124) and are used for dodging the second of second connecting rod (12) and dodge groove (121).

7. The operating mechanism of the conventional circuit breaker according to claim 1, wherein: the two limiting structures (211) respectively comprise a limiting shaft (214) and a connecting shaft (215) arranged on the outer side of the limiting shaft (214), the inner sides of the two limiting shafts (214) are respectively connected with the two ends of the supporting shaft (212), and the diameter of the supporting shaft (212) is smaller than the limiting shaft (214) and larger than the connecting shaft (215).

8. The operating mechanism of the conventional circuit breaker according to claim 1, wherein: the quantity of third connecting rod (13) is two, third connecting rod (13) are the arc structure, one end at third connecting rod (13) be equipped with pivot (231) complex shaft hole (131), the inside outside turn-ups in inner wall in shaft hole (131) form sleeve (130), other end at third connecting rod (13) is equipped with second shaft hole (132) and third shaft hole (133), second shaft hole (132) are connected with second connecting rod (12) through second shaft pin (232), third shaft hole (133) are connected with another third connecting rod (13) through third pivot (233).

9. The operating mechanism of the conventional circuit breaker according to claim 5, wherein: the thickness of sleeve (130) is 2mm, and the internal diameter is 3.5mm, and the external diameter is 5 mm.

10. The operating mechanism of the conventional circuit breaker according to claim 1, wherein: the radius of the supporting shaft (212) is 3.5 mm.