CN211670158U - Circuit breaker - Google Patents

Abstract

The utility model provides a circuit breaker, includes base, operating device, contact system and lid, operating device includes the frame board, its characterized in that: the contact system comprises a moving contact and a fixed contact; the frame plate is provided with a mounting part; the frame plate is provided with a mounting part; further comprising a middle housing having a partition wall; under the assembled state, the partition wall is located between base and the operating device, the hole of stepping down has been seted up corresponding to the installation department of frame plate on the partition wall, and the installation department passes the hole of stepping down is direct and the base butt, the installation department passes through fastener and base fixed connection to middle housing also is fixed on the base through the fastener. The utility model discloses carried out effectual protection to operating device, avoided pollution such as electric arc particle to effectually carried out final spacingly to the contact, protected operating device, middle housing and base cooperation have carried on spacingly to the pivot in addition, avoid the pivot both ends to produce bending deformation.

Description

Circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus especially relates to a circuit breaker.

Background

As is known, a circuit breaker comprises a casing and one or more poles, each of which connects at least one fixed contact and one movable contact, the connection/disconnection of the two contacts to/from each other forming the circuit breaker opening and closing function, respectively.

The circuit breaker mainly comprises a base, an arc extinguishing device, a contact system, an operating mechanism, a tripping device and the like, wherein the base is a containing piece for bearing the systems; the connection/disconnection of the contact system forms the connection and disconnection functions of the circuit breaker respectively; the arc extinguishing system is responsible for extinguishing electric arcs generated when the contacts are separated; the operating mechanism is responsible for the on-off operation of the circuit breaker and enables the switch to be tripped in the case of short circuit, so that equipment and personal safety are protected.

The mechanism, the arc extinguishing device and the contact system are generally not isolated, particles generated by electric arc and the like easily cause pollution to the operating mechanism, and even cause the operating mechanism to be stuck and fail in serious cases.

In addition, because there is no partition, under normal conditions, when the mechanism is opened or the heavy current is repelled, the side phase contact is finally limited on the upper cover, the middle phase contact is generally limited on the mechanism, and the mechanism is easily damaged due to repeated impact of the contacts.

Disclosure of Invention

The utility model provides a circuit breaker, its aim at prevents that the particle etc. that electric arc produced from easily making operating device produce pollution and operating device damage to its simple structure has guaranteed operating device, middle housing and the reliability of being connected of base.

In order to achieve the above purpose, the utility model adopts the technical scheme that: the utility model provides a circuit breaker, includes base, operating device, contact system and lid, forms the accommodation space between base and the lid, the contact system accomodate in the accommodation space, operating device includes the frame board, and its innovation lies in:

the contact system comprises a moving contact and a fixed contact;

the frame plate is provided with a mounting part; the frame plate is provided with a mounting part;

further comprising a middle housing having a partition wall;

under the assembled state, the partition wall is located between base and the operating device, the hole of stepping down has been seted up corresponding to the installation department of frame plate on the partition wall, and the installation department passes the hole of stepping down is direct and the base butt, the installation department passes through fastener and base fixed connection to middle housing also is fixed on the base through the fastener.

In the technical scheme, the contact system is rotationally connected with the operating mechanism through a rotating shaft;

along the axial direction of the rotating shaft, two sides of the middle housing are provided with housing side plates;

bosses are arranged at the two axial ends of the rotating shaft on the rotating center of the rotating shaft, and the rotating shaft is rotatably supported on the joint part between the base and the housing side plate of the middle housing through the bosses.

Preferably, a bearing is arranged on the boss and comprises a first shaft sleeve and a second shaft sleeve, one of the first shaft sleeve and the second shaft sleeve is positioned on the boss, the other one of the first shaft sleeve and the second shaft sleeve is positioned relative to the base, and the first shaft sleeve and the second shaft sleeve are arranged in a relative rotation mode.

Preferably, the combining portion includes a first bearing portion disposed on the base and a second bearing portion disposed on the housing side plate, and the first bearing portion and the second bearing portion are provided with positioning cavities for accommodating and positioning the bearings.

In the technical scheme, the operating mechanism is provided with a lower connecting rod, a first hole is formed in the middle housing corresponding to the lower connecting rod, the lower connecting rod penetrates through the first hole in an assembling state, the operating handle rotates to realize the opening and closing of the moving contact and the static contact, the lower connecting rod swings along with the operation handle, and the shape and the size of the first hole are determined according to the swing range of the lower connecting rod.

Among the above-mentioned technical scheme, on the housing with be provided with arc extinguishing device isolation part on the position that arc extinguishing device is relative, this arc extinguishing device isolation part sets up corresponding to arc extinguishing device.

Preferably, an avoidance groove is formed in the arc extinguishing device isolation portion corresponding to the movable contact, and the shape and size of the avoidance groove are determined according to the swing range of the movable contact.

In the above technical scheme, the middle housing is provided with a stop part corresponding to the moving contact.

In the technical scheme, the middle housing is of an integrated structure.

The utility model discloses theory of operation and advantage: the utility model discloses shroud in the middle of addding on original circuit breaker, its simple structure had both guaranteed operating device, middle housing and the reliability of being connected of base, can carry out effectual protection to operating device again, avoided pollution such as electric arc particle, more effectual carried out finally spacingly to the contact, protected operating device, middle housing and base cooperation have carried on spacingly to the pivot in addition, avoid the pivot both ends to produce bending deformation.

Drawings

Fig. 1 is a structural diagram of a circuit breaker according to the present invention;

fig. 2 is an internal structure diagram of the circuit breaker of the present invention;

fig. 3 is a diagram of the circuit breaker according to the present invention;

FIG. 4 is a schematic structural view of the middle shaft and the middle housing of the present invention;

FIG. 5 is a schematic structural view of the middle housing of the present invention;

fig. 6 is a schematic structural view of the base of the present invention;

FIG. 7 is a first schematic view of the assembly of the middle shaft, the middle housing and the base of the present invention;

FIG. 8 is a second schematic view of the operating mechanism of the present invention cooperating with the middle housing and the base;

fig. 9 is a third schematic view of the cooperation between the operating mechanism and the middle housing and the base of the present invention;

fig. 10 is a blasting diagram of the middle operating mechanism, the middle housing and the base according to the present invention.

In the above drawings: 1. An insulating housing; 11. a base; 111. an inner bottom surface; 112. an outer bottom surface; 113. a first bearing part; 114. a first bonding surface; 12. a middle housing; 121. a partition wall; 122. a hole of abdication; 123. a housing side plate; 1231. a second bearing part; 1232. a second bonding surface; 124. a first hole; 125. an isolation section; 1251. an avoidance groove; 126. a stopper portion; 127. mounting holes; 13. a cover; 131. a through hole for the handle; 2. A contact system; 21. a rotating shaft; 211. a boss; 212. a bearing; 2121. a first bushing; 2122. a second shaft sleeve; 22. a moving contact; 221. a movable contact; 23. static contact; 231. a stationary contact; 3. an arc extinguishing device; 5. an operating mechanism; 51. a frame plate; 511. an installation part; 5111. a threaded hole; 52. an operating handle; 53. a lower connecting rod; 6. and (4) screws.

Detailed Description

The invention will be further described with reference to the following drawings and examples:

example (b):

referring to fig. 1 to 10, the present invention relates to a circuit breaker, as shown in fig. 1 to 3, the circuit breaker is a molded case circuit breaker (hereinafter, referred to as a circuit breaker) including an insulating case 1, and the insulating case 1 is composed of a base 11, a middle case 12 and a cover 13. A contact system 2, an arc extinguishing device 3 and a tripping device are accommodated in the base 11; an operating mechanism 5 is arranged on the middle housing 12; the contact system 2 comprises a rotating shaft 21 which is linked with the operating mechanism 5 to rotate, a movable contact 22 linked with the rotating shaft 21, and a static contact 23 which is repeatedly contacted and separated with the movable contact 22; the arc extinguishing device 3 cuts off the arc generated between the moving contact 22 and the static contact 23; the operating mechanism 5 is well known in the art, and therefore will be described only briefly herein, and the operating mechanism 5 includes frame plates 51 opposed to each other, an operating handle 52 and a toggle link mechanism and a latch structure disposed between the frame plates 51; the lower link 53 of the toggle link mechanism is operatively connected to the rotating shaft 21 through a transverse driving pin, so that the operation of the operating handle 52 drives the toggle link mechanism to move, and the movement is transmitted to the rotatable shaft 21 through the driving pin (not shown) to rotate around the rotation center thereof, so as to drive the movable contact 22 mounted therein to move, thereby realizing the contact or separation of the movable contact 22 and the stationary contact 23, the movable contact 22 and the stationary contact 23 are respectively provided with a movable contact 221 and a stationary contact 231, and the stationary contact 231 is in contact with or separated from the movable contact 221, thereby realizing the on-state and off-state operations of the circuit breaker.

Referring to fig. 1 in conjunction with fig. 2-5, the cover 13 covers the base 11, the intermediate housing 12, and the above-mentioned components housed in the base 11 and the intermediate housing 12; a handle through hole 131 is formed in the cover 13, and the operation handle 52 is projected through the handle through hole 131. In the present embodiment, as a 3-pole circuit breaker, referring to fig. 3, the intermediate case 12 similarly has 3 poles corresponding to each pole of the base 11. Of course, in the present embodiment, a 3-pole circuit breaker is described, but there is also a 4-pole circuit breaker, that is, a circuit having a voltage pole and a neutral pole instead of a 3-pole. In the embodiment, the intermediate case 12 is used for the 4-pole circuit breaker, and in the case of the 4-pole circuit breaker, the base and the cover are typically special 4-pole products. However, the intermediate housing 12 described in the embodiment has an advantage of effectively protecting the operating mechanism from contamination by arc particles and the like. Therefore, the intermediate case 12 (i.e., for 3-pole use) may be attached to the voltage pole of the 4-pole base. In this way, the operation mechanism 5 and the intermediate housing 12 can be made common. The intermediate housing 12 has a partition wall 121, the operating mechanism 5 is disposed on the partition wall 121, and the operating mechanism 5 is connected to the base 11 by a screw. Specifically, as shown in fig. 8, the operating mechanism 5 has a pair of mounting portions 511 at both ends (front and rear ends) of the frame plate 51, the mounting portions 511 are formed by bending a sheet metal as shown in fig. 3, and screw holes 5111 are provided in the mounting portions 511. The partition wall 121 of the middle housing 12 is provided with a relief hole 122 corresponding to the screw hole 5111 of the mounting portion 511 of the frame plate 51, and the mounting portion 511 passes through the relief hole 122 to be combined with the base 11. In assembly, the partition wall 121 is provided between the base 11 and the operating mechanism 5, the operating mechanism 5 is directly fixed to the base 11 by fasteners passing through the base 11 and the intermediate housing 12 to be fixedly connected to the mounting portion 511, and the intermediate housing 12 is also fixed to the base 11 by fasteners so that the partition wall 121 of the intermediate housing 12 is located between the contact system 2 and the operating mechanism 5 to isolate the contact system 2 and the operating mechanism 5. Specifically, as shown in fig. 8, the mounting portion 511 is brought into contact with the inner bottom surface 111 (or the inner top surface, a positioning step provided inside, or the like) of the base 11, and the intermediate cover 12 is fitted between the base 11 and the operating mechanism 5 by directly fastening the mounting portion 511 with a screw 6 or another fastener through the relief hole 122 (see fig. 5) of the intermediate cover 12 from the outer bottom surface 112 of the base 11 and the screw hole 5111 of the mounting portion 511. More specifically, as shown in fig. 10, the middle housing 12 is provided with a plurality of mounting holes 127, the positions and the number of the mounting holes 127 are not limited, and the middle housing 12 may be directly fastened to the base 11. In this embodiment, the number of the mounting holes 127 is preferably 4, and the mounting holes are respectively provided at both ends of the middle housing 12. More specifically, 2 mounting holes 127 are provided near one end of the arc extinguishing device 3, and when assembling, the arc extinguishing device is directly fastened with the base 11 through the 2 mounting holes 127 on the middle housing 12 by fastening screws or other fasteners; there are also 2 mounting holes 127 located at the end remote from the arc extinguishing device 3, and when assembled, the mounting holes 127 are fastened directly to the base 11 by fastening screws or other fasteners passing through the 2 mounting holes 127 of the intermediate housing 12 from the outer surface of the cover 13. In this way, the intermediate housing 12 is fastened directly to the base 11, the operating means 5 being arranged on the intermediate housing 12, the partition 121 of the intermediate housing 12 separating the contact system 2 from the operating means 5.

Referring to fig. 4, 5 and 6, the middle housing 12 has housing side plates 123 at two sides of the rotation shaft 21 in the axial direction; bosses 211 and bearings 212 provided on the bosses 211 are formed at both ends of the rotating shaft 21 in the axial direction and at the rotation center of the rotating shaft 21, and the rotating shaft 21 is rotatably mounted on a coupling portion between the base 11 and the housing side plate 123 of the middle housing 12 through the bosses 211 and the bearings 212. The combining part comprises a first combining surface 114 on the base 11 and a second combining surface 1232 matched with the first combining surface 114 on the side plate 123 of the middle cover 12 and used for connecting the middle cover 12 and the base 11 together, specifically, the base 11 is provided with a first bearing part 113 and the first combining surface 114, and the first bearing part 113 is arranged at the position of the first combining surface 114; the housing side plate 123 is provided with a second combining surface 1232 matched with the first combining surface 114 and used for connecting the middle housing 12 and the base 11 together, and a second bearing part 1231 corresponding to the position of the first bearing part 113, the two ends of the rotating shaft 21 in the length direction and the position of the rotation center of the rotating shaft 21 are provided with bosses 211, and the bosses 211 are installed in a positioning cavity formed by the first bearing part 113 and the second bearing part 1231 in a surrounding way, so that the rotating shaft 21 can be rotatably positioned between the base 11 and the middle housing 12.

Referring to fig. 4 and 7, the boss 211 is sleeved with bearings 212, each bearing 212 is composed of a first sleeve 2121 and a second sleeve 2122, an inner ring of the first sleeve 2121 has an outer shape geometrically matched with the boss 211, an outer ring of the second sleeve 2122 has an outer shape geometrically matched with the first bearing portion 113 and the second bearing portion 1231 of the base 11 and the middle housing 12, in this embodiment, an inner ring of the first sleeve 2121 is preferably a regular polygon, an outer ring of the second sleeve 2122 is also preferably a regular polygon, an outer ring of the first sleeve 2121 and an inner ring of the second sleeve 2122 are circles with two sizes matched, the first sleeve 2121 is sleeved on the boss 211, the second sleeve 2122 is sleeved on the first sleeve 2121 and is disposed in a positioning cavity surrounded by the first bearing portion 113 and the second bearing portion 1231, the rotating shaft 21 is rotatably installed between the base 11 and the intermediate housing 12, and in this embodiment, for the convenience of installation and manufacture, it is preferable that the rotation center of the rotating shaft 21 is provided at the joint portion between the base 11 and the intermediate housing 12. In another embodiment, the rotation center of the rotating shaft 21 may be disposed on the base 11, and the base 11 is formed with a positioning cavity for accommodating the bearing 212, which is geometrically matched with the outer ring of the second sleeve 2122. In a further embodiment, the housing side plate 122 of the middle housing 12 is formed with a locating cavity for receiving the bearing 212, which geometrically matches the outer race profile of the second bushing 2122. The first and second bushings 2121, 2122 of the bearing 212 are made of metal materials that are beneficial to reducing friction and wear, such as brass-steel or tin bronze-steel alloy materials, and are integrated with the corresponding parent bodies by an embedding process or other methods, and are not easy to fall off. Therefore, the boss 211 on the rotating shaft 21 is not directly contacted with the bearing parts of the base 11 and the middle cover shell 12 any more, the friction force is greatly reduced during rotation, the abrasion can be effectively reduced, the service life is prolonged, and the reliability of the motion of the rotating shaft 21 is enhanced.

Referring to fig. 3 in combination with fig. 4, the lower link 53 of the operating mechanism 5 of the present invention passes through the middle housing 12 to be connected to the rotating shaft 21, the middle housing 12 is provided with a first hole 124 through which the lower link 53 of the operating mechanism passes to be connected to the rotating shaft 21, and the first hole 124 has a shape of the first hole 124 determined by a rotation range of the lower link 53 when the movable contact 22 and the stationary contact 23 are opened and closed with the rotation of the operating handle 52.

In order to effectively protect the operating mechanism from arc particles and the like, it is preferable that the intermediate housing 12 is provided with a spacer 125 at a position facing the arc extinguishing device 3. The isolation portion 125 is provided with an escape groove 1251 (see fig. 5) through which the movable contact 22 passes and which is coupled to the rotating shaft 21, and the escape groove 1251 has a shape determined by a rotation range of the movable contact 22 when the movable contact 22 and the stationary contact 23 are opened and closed by the rotation of the operating handle 52. Further, in order to absorb the impact when the movable contact 22 is separated, it is preferable to provide a stopper 126 (see fig. 5) in the intermediate housing 12 at a position facing the movable contact 22. The stopping portion 126 of the middle housing 12 is a final limit for the movable contact 22, and the stopping portion 126 prevents the movable contact 22 from rotating through a stroke. When short-circuit current flows, the movable contact 22 repels under the action of electric repulsion force, and when the movable contact 22 touches the stopping part 126 during the rotation process, the movable contact 22 cannot continue to rotate.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims (8)

1. The utility model provides a circuit breaker, includes base (11), operating device (5), contact system (2) and lid (13), forms the accommodation space between base (11) and lid (13), and contact system (2) are accomodate in the accommodation space, operating device includes frame plate (51), its characterized in that:

the contact system (2) comprises a moving contact (22) and a fixed contact (23);

the frame plate (51) is provided with a mounting part (511);

further comprising a middle casing (12), the middle casing (12) having a partition wall (121);

under the assembled state, between base (11) and operating device (5) is located to partition wall (121), yielding hole (122) have been seted up corresponding to installation department (511) of frame plate (51) on partition wall (121), and installation department (511) pass yielding hole (122) are direct to be propped with base (11), installation department (511) are through fastener and base (11) fixed connection to middle housing (12) also are fixed on base (11) through the fastener.

2. The circuit breaker of claim 1, wherein: the contact system (2) is rotationally connected with the operating mechanism (5) through a rotating shaft (21);

along the axial direction of the rotating shaft (21), two sides of the middle housing (12) are provided with housing side plates (123);

the rotary shaft (21) is characterized in that bosses (211) are arranged at two axial ends of the rotary shaft (21) on a rotary center of the rotary shaft (21), and the rotary shaft (21) is rotatably supported on a joint part between the base (11) and the housing side plate (123) of the middle housing (12) through the bosses (211).

3. The circuit breaker of claim 2, wherein: the boss (211) is provided with a bearing (212), the bearing (212) comprises a first shaft sleeve (2121) and a second shaft sleeve (2122), one of the first shaft sleeve (2121) and the second shaft sleeve (2122) is positioned on the boss (211), the other one of the first shaft sleeve (2121) and the second shaft sleeve (2122) is positioned relative to the base (11), and the first shaft sleeve (2121) and the second shaft sleeve (2122) are arranged in a relative rotating mode.

4. The circuit breaker of claim 3, wherein: the combining part comprises a first bearing part (113) arranged on the base (11) and a second bearing part (1231) arranged on the cover shell side plate (123), and positioning cavities for accommodating and positioning the bearing (212) are arranged on the first bearing part (113) and the second bearing part (1231).

5. The circuit breaker of claim 1, wherein: the operating mechanism (5) is provided with a lower connecting rod (53), a first hole (124) is formed in the middle housing (12) corresponding to the lower connecting rod (53), and in an assembling state, the lower connecting rod (53) penetrates through the first hole (124).

6. The circuit breaker of claim 1, wherein: still accomodate arc control device (3) in the accommodation space between base (11) and lid (13), be provided with arc control device isolation portion (125) on middle housing (12) with arc control device (3) relative position, this arc control device isolation portion (125) set up corresponding to arc control device.

7. The circuit breaker of claim 6, wherein: and an avoiding groove (1251) is formed in the arc extinguishing device isolation part (125) corresponding to the moving contact (22).

8. The circuit breaker of claim 1, wherein: the intermediate housing (12) is provided with a stop (126) corresponding to the movable contact (22).

Images