CN214505401U

CN214505401U - Contact protection device and circuit breaker

Info

Publication number: CN214505401U
Application number: CN202120193103.XU
Authority: CN
Inventors: 卢志刚; 辛娜; 秦治斌; 徐柏超; 雷鸿健; 徐大胜; 王江涛
Original assignee: Shanghai Chint Intelligent Technology Co Ltd
Current assignee: Shanghai Chint Intelligent Technology Co Ltd
Priority date: 2021-01-23
Filing date: 2021-01-23
Publication date: 2021-10-26
Anticipated expiration: 2031-01-23

Abstract

A contact protection device comprises a contact support for fixing a moving contact, wherein a rotatable air baffle is arranged on the contact support, a rolling mechanism matched with a shell in a rolling way is arranged on the air baffle, the contact support drives the moving contact to be in contact with a static contact, the rolling mechanism is driven to roll along the shell, and the air baffle is driven to rotate towards the direction close to the contact support by the rolling mechanism; when the contact support drives the moving contact to be separated from the static contact, the air baffle rotates towards the direction far away from the contact support, and the air baffle is in rolling fit with the shell through the rolling mechanism, so that the structure is simple, the guide structure is omitted, the local sealing effect is achieved, and arc airflow can be effectively blocked. The circuit breaker comprises the contact protection device, wherein the space of a moving contact, a fixed contact and an arc extinguish chamber is locally sealed to avoid the backflow of arc airflow, and the back breakdown is reduced.

Description

Contact protection device and circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus field especially relates to a contact protector and circuit breaker.

Background

The circuit breaker is an important component in a power distribution network, and when faults such as current overload and short circuit occur in the power distribution network, the circuit breaker can cut off a power supply in time to protect equipment and personnel safety. The important structure of the circuit breaker is one or more groups of static contacts and moving contacts matched with the static contacts. When a circuit breaks down, the breaker monitors that the current value exceeds a preset protection value, the breaker can trigger the operating mechanism to act, the moving contact and the static contact are quickly separated, however, due to the fact that the voltage and the current value are too large, electric arcs can be generated between the moving contact and the static contact, and the electric arcs can form electric arc airflow.

Although the existing circuit breaker is usually provided with a blocking structure, the blocking structure is used for preventing the arc airflow from burning the flexible connection, but the structure is complex and the sealing performance is poor, and the flow direction of the arc airflow cannot be controlled, so that the arc airflow can not only damage other parts in the circuit breaker, but also can cause the moving contact and the static contact to be punctured again, and arc reignition is formed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's defect, provide a simple structure, the reliability is high, the contact protector that the leakproofness is good.

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

a contact protection device comprises a contact support for fixing a moving contact, wherein a rotatable air baffle is arranged on the contact support, a rolling mechanism in rolling fit with a shell is arranged at the end part of the air baffle, and when the moving contact is driven by the contact support to be contacted with a static contact, the rolling mechanism drives the air baffle to rotate towards the direction close to the contact support; when the contact support drives the moving contact to be separated from the static contact, the air baffle plate rotates towards the direction far away from the contact support.

Preferably, the rolling mechanism comprises a roller and a rolling shaft, the rolling shaft is arranged at the lower end of the air baffle plate, and the roller is rotatably sleeved on the rolling shaft.

Preferably, the air baffle is connected with an elastic member, and the elastic member is used for driving the air baffle to rotate towards a direction away from the contact support.

Preferably, the elastic component is a torsional spring, the air baffle is rotatably installed on the articulated shaft, the torsional spring sleeve is arranged on the articulated shaft, and the two connecting ends of the torsional spring are respectively connected with the contact support and the air baffle.

Preferably, the device further comprises a protective cover arranged on the contact support, and the air baffle is rotatably connected with the protective cover.

Preferably, a second protective cover is arranged on one side, far away from the movable contact, of the protective cover, and one end of the air baffle extends into the second protective cover and is connected with the second protective cover in a rotating mode.

Preferably, the second protection casing includes two second side guard plates that set up relatively, and one side of two second side guard plates is connected with the protection casing respectively, connects through guard plate before the second between the opposite side of two second side guard plates, and one side of guard plate is connected through second top guard plate before two second side guard plates and the second, and the fender gas board is inserted in the second protection casing from the opposite side and is connected with two second side guard plates rotation, and the elastic component can promote to keep off the gas board and support spacing before the second on the guard plate.

Preferably, the air baffle plate is provided with a first boss extending between the two second side protection plates, the two second side protection plates are respectively provided with a first shaft hole matched with the hinge shaft, and the hinge shaft can respectively penetrate through the first boss and the first shaft holes on the two second side protection plates; the length of first boss is less than the board of keeping off the gas, the elastic component is two torsional springs, and two torsional springs set up respectively between the both ends of two second side guard plates and first boss and overlap on the articulated shaft, and the one end of two elastic components supports respectively on the board of keeping off the gas, and the other end supports respectively on protection casing or second protection casing.

Preferably, the air baffle is provided with a second boss, the second boss is provided with a notch for accommodating the roller and a roller capable of penetrating through the notch, the roller is limited in the notch by the roller to rotate, and the radius of the roller is larger than that of the second boss.

The utility model discloses a contact protector, the fender gas board on the contact support passes through rolling mechanism and casing roll cooperation, and not only simple structure has saved guide structure, has the effect of local sealing moreover, can effectively block the electric arc air current. In addition, the rolling matching structure of the roller and the shell has the characteristic of small friction force, is not easy to block and has high reliability.

The utility model also provides a circuit breaker, including the contact device with contact protector, static contact fixed mounting in the casing of circuit breaker, the moving contact is fixed on contact protector's contact support, is equipped with the explosion chamber in one side of static contact, contact protector set up the one side of keeping away from the explosion chamber at the static contact, when the contact supports the swing of drive moving contact and static contact or separation, rolling mechanism on the gas shield contacts with the casing of circuit breaker all the time, protection casing and gas shield are used for keeping apart moving contact, static contact and explosion chamber.

The utility model discloses a circuit breaker carries out local sealing with the space of moving contact, static contact and explosion chamber respectively through protection casing and fender gas board, not only can avoid electric arc air current backward flow, reduces to puncture behind one's back but also can, and increase explosion chamber internal gas pressure is favorable to cooling arc and arc blowing.

Drawings

Fig. 1 is a schematic structural diagram of a contact protection device according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of the embodiment of the present invention, in which the protective cover is omitted in FIG. 1;

fig. 3 is a schematic structural diagram of a protective cover according to an embodiment of the present invention;

fig. 4 is a diagram illustrating the position of the air baffle when the moving contact contacts the stationary contact according to an embodiment of the present invention;

fig. 5 shows the position of the air baffle when the moving contact is separated from the static contact according to the embodiment of the present invention.

Detailed Description

As shown in fig. 1-2, the contact protection device of the present invention includes a contact support 130 for fixing a moving contact 110, a rotatable air baffle 300 is disposed on the contact support 130, a rolling mechanism which is in rolling fit with a housing is disposed at an end of the air baffle 300, the contact support 130 drives the moving contact 110 to contact a static contact 120, the rolling mechanism is driven to roll along the housing, and the air baffle 300 is driven to rotate in a direction close to the contact support 130 by the rolling mechanism (fig. 4); when the movable contact 110 is separated from the fixed contact 120 by the contact support 130, the air blocking plate 300 rotates away from the contact support 130 (fig. 5).

The following description will further describe a specific embodiment of the contact protection device of the present invention with reference to the embodiments shown in fig. 1 to 5. The contact protection device of the present invention is not limited to the description of the following embodiments.

As shown in fig. 4-5, the present invention further provides a circuit breaker, including a contact device and a contact protection device, the contact device includes a movable contact 110 and a fixed contact 120, the fixed contact 120 is fixed in the casing of the circuit breaker, the movable contact 110 is fixed on the contact support 130, an arc extinguish chamber 400 is arranged above the fixed contact 120, the contact protection device further includes a protective cover 210, a gas baffle 300 is rotatably connected with the protective cover 210, the protective cover 210 and the gas baffle 300 of the contact protection device are respectively arranged below the fixed contact 120, i.e. one side away from the arc extinguish chamber 400, when the contact support 130 drives the movable contact 110 to swing and contact or separate from the fixed contact 120, a rolling mechanism on the gas baffle 300 is always in contact with the casing of the circuit breaker, the protective cover 210 and the gas baffle 300 are used for isolating the movable contact 110, the fixed contact 120 and the arc extinguish chamber 400, the movable contact 110 is respectively arranged on the protective cover 210 and the gas baffle 300, The space of the static contact 120 and the arc extinguish chamber 400 is locally sealed, so that the electric arc airflow can be prevented from flowing back, the back breakdown is reduced, the air pressure in the arc extinguish chamber 400 can be increased, and the electric arc cooling and the arc blowing are facilitated. Preferably, the gas barrier 300 is a gas generating material, and when the arc contacts the gas barrier 300 of the gas generating material, the gas barrier 300 can generate gas flowing toward the arc extinguishing chamber 400.

As shown in fig. 2, the rolling mechanism includes a roller 330 and a roller 322, the roller 322 is disposed at the lower end of the air baffle 300, and the roller 330 is rotatably sleeved on the roller 322. The roller 330 is rotatably sleeved on the roller 322, and then the roller 322 is arranged at the lower end of the air baffle 300, so that the assembly is very convenient, and the local sealing performance is better.

Specifically, a first boss 310 and a second boss 320 are respectively arranged at two ends of the gas baffle 300, the first boss 310 is used for rotary connection, a rotatable roller 330 is arranged on the second boss 320, when the movable contact 110 is close to the static contact 120, the movable contact drives the gas baffle 300 to press the roller 330 to move on the corresponding shell, and the roller 330 is far from the static contact 120 to drive the gas baffle 300 to rotate; when the moving contact 110 is far away from the static contact 120, the elastic member 230 drives the air baffle 300 to rotate towards the moving contact 110, and the roller 330 is in rolling fit with the housing, so that the resistance of the air baffle 300 can be effectively reduced. Of course, the contact protection device of the present invention can also be used in other switching devices besides circuit breakers, and the roller 330 is matched with the casing of the switching device, which is not specifically limited here.

As shown in fig. 2, two notches 321 for respectively accommodating the rollers 330 and a roller 322 capable of passing through the notches 321 are formed in the second boss 320, the roller 322 can sequentially pass through the rollers 330 of the plurality of notches 321, the roller 330 is limited in the notches 321 to rotate by the roller 322, the radius of the roller 330 is greater than that of the second boss 320, so that the circumference of the roller 330 can extend to the outer side of the notch 321 of the second boss 320 to be matched with the housing of the contact device, second clips 323 for limiting the roller 322 are respectively arranged at two ends of the second boss 320, and the roller 322 is limited on the second boss 320 by the second clips 323. The notch 321 may limit the roller 330 to prevent the roller 330 from moving along the roller 322, or the notch 321 may not be provided. In addition, one or more than three rollers 330 may be provided, all of which belong to the protection scope of the present invention. As shown in fig. 1 and 3, the air baffle 300 of the present invention may be installed on either the contact support 130 or the protective cover 210. The contact support 130 is of a U-shaped structure, the contact support 130 includes two side support plates 131 arranged oppositely, and a rear support plate 132 connected between one sides of the two side support plates 131, and the plurality of movable contacts 110 are arranged between the two side support plates 131;

the protection casing 210 becomes the U font structure, and the protection casing 210 includes two side protection plates 211 that set up relatively to and connect the preceding protection plate 212 between two side protection plates 211 one sides, and two side protection plates 211 are connected with two side support plates 131 of contact support 130 respectively, and one side of preceding protection plate 212 sets up with the back support plate 132 of contact support 130 relatively, and the opposite side of preceding protection plate 212 is equipped with second protection casing 220, the inboard of second protection casing 220 is inserted to the one end that keeps off gas board 300 and protection casing 210 rotate to be connected. Certainly, the protective cover 210 may not be provided, but the protective cover 210 may be used to shield the protective moving contact 110, and may also block the arc airflow from flowing to the rotation center of the air baffle 300, so as to improve the sealing performance around the air baffle 300, further control the flowing direction of the arc airflow, and prevent the arc airflow from damaging other parts.

Further, be equipped with second protection casing 220 on the protection casing 210, the one end of air baffle 300 is stretched in the second protection casing 220 and is connected with second protection casing 220 is rotated, and second protection casing 220 can shelter from the rotation center of elastic component 230 and air baffle 300, prevents that the electric arc air current from passing air baffle 300, ablates the hinge structure at rotation center.

As shown in fig. 2 to 3, the second shield 220 includes two second side protection plates 221 disposed opposite to each other, one sides of the two second side protection plates 221 are connected to the shield 210, the other sides of the two second side protection plates 221 are connected to each other through a second front protection plate 222, one sides of the two second side protection plates 221 and the second front protection plate 222 are connected to each other through a second top protection plate 223, the air blocking plate 300 is inserted into the second shield 220 from the other side and is rotatably connected to the two second side protection plates 221, and the elastic member 230 can push the air blocking plate 300 to abut against the second front protection plate 222 for limiting. The second top protection plate 223 and the second front protection plate 222 can shield the rotation center of the air baffle 300, and the second front protection plate 222 can also play a role in limiting the rotation of the air baffle 300 to prevent the rotation angle of the air baffle 300 from being too large. Preferably, an avoiding groove 240 (fig. 4) for avoiding the second protective cover 220 is formed in the housing of the contact device, and the moving contact 110 drives the second protective cover 220 to be inserted into the avoiding groove 240 when contacting the stationary contact 120.

As shown in fig. 1-2, the air blocking plate 300 is connected to the elastic member 230, and when the contact support 130 drives the movable contact 110 to be separated from the stationary contact 120, the elastic member 230 is used to drive the air blocking plate 300 to rotate in a direction away from the contact support 130, so as to provide a reset force for the air blocking plate 300 through the elastic member 230. Of course, the elastic member 230 may not be provided, and the air blocking plate 300 may be driven to be reset by the acting force such as gravity and magnetic field force. When the contact support 130 drives the moving contact 110 to contact with the stationary contact 120, the protective cover 210 drives the air blocking plate 300 to rotate in a direction away from the moving contact 110 and the stationary contact 120 and compress the elastic member 230; when the contact support 130 drives the movable contact 110 to separate from the stationary contact 120, the elastic member 230 drives the air baffle 300 to rotate toward the stationary contact 120.

As shown in fig. 2, the elastic member 230 is a torsion spring, the air baffle 300 is rotatably mounted on the hinge shaft 311, the torsion spring is sleeved on the hinge shaft 311, and two connecting ends of the torsion spring are respectively connected with the contact support 130 and the air baffle 300.

Specifically, this embodiment includes two elastic components 230, the length of first boss 310 is less than gas shield 300, two elastic components 230 set up respectively between the both ends of two second side guard plates 221 and first boss 310, two elastic components 230 overlap respectively on articulated shaft 311, the one end of two elastic components 230 supports respectively on gas shield 300, the other end supports respectively on protection casing 210 or second protection casing 220, elastic component 230 adopts the torsional spring, the structure is more reliable, be difficult to fatigue, elastic component 230 also can be arc or wave isotructure of integrated into one piece on gas shield 300, also can be extension spring and pressure spring, all belong to the utility model discloses a protection scope.

As shown in fig. 2 to 3, the two second side protection plates 221 are respectively provided with first shaft holes 312 engaged with the hinge shaft 311, the first bosses 310 extend between the two second side protection plates 221, the hinge shaft 311 can respectively pass through the first shaft holes 312 on the first bosses 310 and the two second side protection plates 221, the air baffle 300 is rotatably installed on the second shield 220 through the hinge shaft 311, the outer sides of the two second side protection plates 221 are respectively provided with first clips 313 for limiting the hinge shaft 311, and the hinge shaft 311 is limited on the two second side protection plates 221 through the first clips 313.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. A contact protection device comprising a contact support (130) for fixing a movable contact (110), characterized in that: the contact support (130) is provided with a rotatable air baffle (300), the end part of the air baffle (300) is provided with a rolling mechanism which is matched with the shell in a rolling way, and when the contact support (130) drives the moving contact (110) to be contacted with the static contact (120), the rolling mechanism drives the air baffle (300) to rotate towards the direction close to the contact support (130); when the contact support (130) drives the moving contact (110) to be separated from the static contact (120), the air baffle (300) rotates towards the direction far away from the contact support (130).

2. The contact guard of claim 1, wherein: the rolling mechanism comprises a roller (330) and a rolling shaft (322), the rolling shaft (322) is arranged at the lower end of the air baffle plate (300), and the roller (330) is rotatably sleeved on the rolling shaft (322).

3. The contact guard of claim 1, wherein: the air baffle (300) is connected with the elastic piece (230), and the elastic piece (230) is used for driving the air baffle (300) to rotate towards the direction far away from the contact support (130).

4. A contact protection device according to claim 3, wherein: the elastic component (230) is a torsion spring, the air baffle plate (300) is rotatably installed on the hinged shaft (311), the torsion spring is sleeved on the hinged shaft (311), and two connecting ends of the torsion spring are respectively connected with the contact support (130) and the air baffle plate (300).

5. The contact guard of claim 1, wherein: the contact structure also comprises a protective cover (210) arranged on the contact support (130), and the air baffle plate (300) is rotatably connected with the protective cover (210).

6. The contact guard of claim 5, wherein: the protective cover (210) is provided with a second protective cover (220) on one side far away from the movable contact (110), and one end of the air baffle plate (300) extends into the second protective cover (220) to be rotatably connected with the second protective cover (220).

7. The contact guard of claim 6, wherein: the second protection casing (220) include two second side guard plates (221) that set up relatively, one side of two second side guard plates (221) is connected with protection casing (210) respectively, connect through guard plate (222) before the second between the opposite side of two second side guard plates (221), one side of guard plate (222) is connected through second top guard plate (223) before two second side guard plates (221) and the second, keep off gas board (300) and insert in second protection casing (220) from the opposite side and rotate with two second side guard plates (221) and be connected, elastic component (230) can promote to keep off gas board (300) and support and spacing on guard plate (222) before the second.

8. The contact guard of claim 7, wherein: the air baffle plate (300) is provided with a first boss (310) extending between the two second side protection plates (221), the two second side protection plates (221) are respectively provided with a first shaft hole (312) matched with the hinge shaft (311), and the hinge shaft (311) can respectively penetrate through the first boss (310) and the first shaft holes (312) on the two second side protection plates (221); the length of first boss (310) is less than gas shield (300), elastic component (230) are two torsional springs, and two torsional springs set up respectively between the both ends of two second side guard plates (221) and first boss (310) and overlap on articulated shaft (311), and the one end of two elastic component (230) supports respectively on gas shield (300), and the other end supports respectively on protection casing (210) or second protection casing (220).

9. The contact guard of claim 4, wherein: the air baffle plate (300) is provided with a second boss (320), the second boss (320) is provided with a notch (321) used for accommodating the roller (330), and a roller (322) capable of penetrating through the notch (321), the roller (330) is limited in the notch (321) to rotate through the roller (322), and the radius of the roller (330) is larger than that of the second boss (320).

10. A circuit breaker, characterized by: the protection device comprises a contact device and the contact protection device as claimed in any one of claims 1 to 9, wherein the fixed contact (120) is fixedly installed in a shell of the circuit breaker, the movable contact (110) is fixed on a contact support (130) of the contact protection device, an arc extinguish chamber (400) is arranged on one side of the fixed contact (120), the contact protection device is arranged on one side, away from the arc extinguish chamber (400), of the fixed contact (120), the contact support (130) drives the movable contact (110) to swing to be in contact with or separated from the fixed contact (120), a rolling mechanism on the gas baffle (300) is always in contact with the shell of the circuit breaker, and the protection cover (210) and the gas baffle (300) are used for isolating the movable contact (110), the fixed contact (120) and the arc extinguish chamber (400).