CN218769366U

CN218769366U - Air circuit breaker

Info

Publication number: CN218769366U
Application number: CN202223336890.2U
Authority: CN
Inventors: 陈红影; 朱天胜; 陈琳
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2022-12-12
Filing date: 2022-12-12
Publication date: 2023-03-28
Anticipated expiration: 2032-12-12

Abstract

An air circuit breaker belongs to the technical field of low-voltage electrical appliances. Comprises a contact system, an electromagnet, a connecting rod, a main shaft, a brake separating spring and a hasp component; one end of the connecting rod is hinged with a movable iron core on the electromagnet, and the other end of the connecting rod is hinged with a swing rod arranged on the main shaft; when the circuit breaker is switched on, the movable iron core drives the connecting rod to act, the connecting rod drives the oscillating bar to act, and the oscillating bar drives the contact system to perform switching-on action; after the closing state is in place, the hasp assembly locks the movable iron core or the connecting rod, so that the circuit breaker is locked in the closing state; when the breaker is opened, the hasp assembly is unlocked, so that the opening spring pulls the swing rod and drives the contact system to perform opening action. The advantages are that: when the circuit breaker is switched on, the hasp assembly is locked on the movable iron core or the connecting rod, so that errors caused by transmission of parts when the movable iron core reaches a switching-on position are smaller, the switching-on locking position of the movable iron core can be closer to the back, the driving force output by the electromagnet is increased, and the switching-on speed of the circuit breaker is increased.

Description

Air circuit breaker

Technical Field

The utility model belongs to the technical field of low-voltage apparatus, concretely relates to air circuit breaker.

Background

The air circuit breaker generally uses a spring mechanism for operation, but the spring mechanism has many parts and is complicated to operate, so that some air circuit breakers use an electromagnet instead of the spring mechanism. The existing air circuit breaker drives the circuit breaker by using a solenoid electromagnet, drives a contact system of the circuit breaker to act, and realizes the closing action of the circuit breaker.

The solenoid electromagnet comprises a static iron core, a movable iron core and a coil, wherein the movable iron core acts after the coil is electrified. And a driving rod is fixed on the movable iron core and drives the connecting rod assembly through a connecting rod. The connecting rod component drives the moving contact of the contact system to swing, so that the contact system is combined and separated.

In the existing air circuit breaker adopting an electromagnet as a driving part, after the air circuit breaker enters a closing state, a connecting rod assembly is locked through a buckle assembly, so that the air circuit breaker is locked at a closing position. When the air circuit breaker is to perform the opening action, the hasp assembly unlocks the connecting rod assembly, and the air circuit breaker performs the opening action.

Because the existing hasp assembly is locked on the connecting rod assembly, and the connecting rod assembly is connected with the movable iron core through a connecting rod, the position of the movable iron core is influenced by errors formed by transmission among parts during locking, in order to eliminate the influence of the errors and ensure that the closing is in place, the closing in-place position of the movable iron core needs to be advanced, and a redundant stroke for offsetting the errors is reserved to meet the requirements. The larger the redundant stroke is, the more forward the locking position of the movable iron core is, and at this time, the lower the driving force output by the movable iron core is, which is not beneficial to improving the closing speed of the circuit breaker.

In view of the above-mentioned prior art, there is a need for a reasonable improvement in the structure of the prior solenoid-type electromagnet. The applicant has therefore made an advantageous design, in the context of which the solution to be described below is made.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an air circuit breaker, its hasp subassembly locking is on moving iron core or tie rod for it is littleer to move the error that the iron core received the spare part transmission when reacing the switching-on position, thereby makes the combined floodgate latched position that moves iron core can more lean on the back, has increased the drive power of electro-magnet output, has improved the combined floodgate speed of circuit breaker.

The utility model discloses a task is accomplished like this, an air circuit breaker, including contact system, electro-magnet, connecting rod, main shaft, separating brake spring and hasp subassembly; one end of the connecting rod is hinged with the movable iron core on the electromagnet, and the other end of the connecting rod is hinged with a swing rod arranged on the main shaft; when the circuit breaker is switched on, the movable iron core drives the connecting rod to act, the connecting rod drives the oscillating bar to act, and the oscillating bar drives the contact system to perform switching-on action; after the closing state is in place, the hasp assembly locks the movable iron core or the connecting rod, so that the circuit breaker is locked in the closing state; when the breaker is opened, the hasp assembly is unlocked, so that the opening spring pulls the swing rod and drives the contact system to perform opening action.

In a specific embodiment of the present invention, the electromagnet further includes a stationary core and a coil, the movable core is disposed in the coil frame of the coil, when the coil is powered on, the movable core moves downward and outputs driving force to the outside, the upper end of the movable core is fixed with a driving rod, and the buckle assembly is engaged with the driving rod of the movable core.

In another specific embodiment of the present invention, the connecting rod includes a first hinge portion, a second hinge portion and a buckle end, a driving rod is fixed on the upper end of the movable iron core, the first hinge portion is hinged to the driving rod, the second hinge portion is hinged to the swing rod, and the buckle assembly is locked and engaged with the buckle end of the connecting rod.

In another specific embodiment of the present invention, the fastener assembly includes a first fastener and a second fastener, the first fastener and the second fastener being engaged with each other, and the first fastener being engaged with the driving rod.

In another specific embodiment of the present invention, the fastener assembly includes a first fastener and a second fastener, the first fastener and the second fastener being snap-fitted, and the first fastener being further snap-fitted with the fastener end.

In a further embodiment of the present invention, the first buckle member has a first buckle gap and a second buckle gap, the extending end of the driving rod has a buckle shaft i, the first buckle gap is in lock-catch fit with the first buckle shaft, and the second buckle gap is in lock-catch fit with the second buckle member.

In yet another specific embodiment of the present invention, the first fastening member has a first fastening gap and a second fastening gap, the fastening end has a fastening shaft ii, the first fastening gap is in locking engagement with the fastening shaft ii, and the second fastening gap is in locking engagement with the fastening end of the second fastening member.

In a more specific embodiment of the present invention, the swing rod is fixed to the main shaft, and both swing rods rotate synchronously.

In a still more specific embodiment of the present invention, the opening spring is a tension spring, one end of which is connected to the fixed shaft of the circuit breaker, and the other end of which is connected to the swing rod.

The utility model discloses owing to adopted above-mentioned structure, the beneficial effect who has: when the circuit breaker is switched on, the hasp assembly is locked on the movable iron core or the connecting rod, and compared with the locking on the connecting rod assembly in the prior art, the hasp assembly enables errors caused by transmission of parts when the movable iron core reaches a switching-on position to be smaller, and therefore the switching-on locking position of the movable iron core can be closer to the rear, the driving force output by the electromagnet is increased, and the switching-on speed of the circuit breaker is improved.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of the air circuit breaker of the present invention.

Fig. 2 is a schematic diagram of a part of the structure of the first embodiment of the air circuit breaker in the open state.

Fig. 3 is a schematic diagram of a part of the structure of the first embodiment of the air circuit breaker in a closing state.

Fig. 4 is a schematic diagram of a part of the structure of the second embodiment of the air circuit breaker in the closing state.

Fig. 5 is a graph of the electromagnetic driving force of the electromagnet and the mechanism load as a function of the air gap length.

In the figure: 1. the contact system comprises a contact system, 11 moving contacts, 111 moving contact pieces and 12 fixed contacts; 3. the electromagnet, 31, the static iron core, 32, the movable iron core, 321, the driving rod, 3211, the extending end, 32111, the hasp shaft I and 3212, the hinge part; 4. the connecting rod 41, the first hinge part 42, the second hinge part 43, the buckle end 431, the buckle shaft II; 5. main shaft, 51, swing link; 6. a brake separating spring 61, a fixed shaft; 7. the buckle component comprises a buckle component, 71, a first buckle piece, 711, a first buckle gap, 712, a second buckle gap, 72, a second buckle piece and 721, a buckle end; 100. a housing.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings, but the embodiments are not limited to the technical solutions, and any changes in the form but not in the spirit according to the present invention should be regarded as the protection scope of the present invention.

In the following description, all the concepts related to the directions or orientations of up, down, left, right, front and rear are based on the position of the corresponding view, and thus should not be construed as particularly limiting the technical solution provided by the present invention.

Example one

Fig. 1, fig. 2, and fig. 3 are schematic diagrams of a first embodiment. The air circuit breaker comprises a contact system 1, an arc extinguish chamber 2, an electromagnet 3, a connecting rod 4, a main shaft 5, a brake separating spring 6 and a hasp assembly 7.

When the breaker is switched on, the electromagnet 3 drives the connecting rod 4 to act, and the connecting rod 4 drives the contact system 1 to perform switching-on action through the main shaft 5. When the breaker enters a closing state, the hasp assembly 7 locks the electromagnet 3 or the connecting rod 4, so that the breaker is locked in the closing state.

When the breaker is opened, the hasp assembly 7 is unlocked, the opening spring 6 drives the main shaft 5 to perform opening action, and then the contact system 1 performs opening action. Meanwhile, the electromagnet 3 is pulled by the opening spring 6 due to the connection relationship to reset.

As shown in fig. 1, the contact system 1 is located in a housing 100 of the circuit breaker, the arc-extinguishing chamber 2 is located at an upper opening of the housing 100, and the electromagnet 3 is located at a right side (shown in fig. 1) of the contact system 1, that is, for the circuit breaker, the electromagnet 3 is located at a front side of the contact system 1. The opening spring 6 and the hasp component 7 are both positioned above the electromagnet 3, and the spindle 5 is positioned between the contact system 1 and the electromagnet 3.

Specifically, the contact system 1 includes a movable contact 11 and a fixed contact 12, and the movable contact 11 can rotate relative to the fixed contact 12, thereby realizing contact or separation between the two. When the contact is made, the movable contact 11 and the fixed contact 12 are in contact. When the movable contact 11 and the fixed contact 12 are separated, the movable contact and the fixed contact are separated.

The arc extinguish chamber 2 is positioned above the contact system 1, when the contact system 1 breaks current and generates electric arc, the electric arc goes upwards into the arc extinguish chamber 2 and then is extinguished in the arc extinguish chamber 2. And thus the current is cut off.

In this embodiment, the electromagnet 3 is a solenoid electromagnet, and includes a stationary core 31, a movable core 32, and a coil, and the movable core 32 is disposed in a bobbin of the coil. When the coil is energized, the movable iron core 32 moves downward and outputs a driving force to the outside. Of course, the electromagnet 3 may be a clapper type electromagnet.

A driving rod 321 is fixed at the upper end of the movable iron core 32, generally, the driving rod 321 is a rod shape and is fixed on the movable iron core 32, and the driving rod 321 and the movable iron core 32 realize a synchronous motion relationship, that is, when the driving rod 321 is locked, the movable iron core 32 is also locked.

Specifically, the stationary core 31 has a frame shape with an upper opening, and the movable core 32 has a column shape and can move up and down relative to the stationary core 31. In this embodiment, the coil is energized, and the movable core 32 moves downward to retract into the stationary core 31.

The driving rod 321 is a bent rod, a buckle shaft I32111 is arranged at an extending end 3211 of the driving rod, and the buckle shaft I32111 is used for being matched with the buckle component 7 in a locking manner. The driving rod 321 has a hinge portion 3212 for the hinge connection of the connecting rod 4.

The connecting rod 4 is rod-shaped, and one end thereof is hinged to the hinge portion 3212, while the other end thereof is hinged to the swing link 51 on the main shaft 5.

The main shaft 5 is a circular shaft and is positioned at one side of the plurality of contact systems 1, for example, when the circuit breaker is a three-phase circuit breaker, three swing rods 51 on the main shaft 5 are respectively connected with the moving contacts 11 on the three-phase contact systems 1; if the circuit breaker is a four-phase circuit breaker, four swing rods 51 on the main shaft 5 are respectively connected with the moving contacts 11 on the four-phase contact system 1. Each oscillating bar 51 should ensure synchronous rotation to ensure the consistency of the movement of the plurality of movable contacts 11. Preferably, the swing link 51 is fixed to the main shaft 5, for example, by welding.

In this embodiment, the opening spring 6 is a tension spring, one end of which is fixedly connected to the fixed shaft 61 of the circuit breaker, and the other end of which is connected to the swing link 51, so as to provide a pulling force for the swing link 51.

The buckle assembly 7 comprises a first buckle member 71 and a second buckle member 72, the first buckle member 71 is in lock fit with the second buckle member 72, and the first buckle member 71 is also in lock fit with the driving rod 321. Specifically, the first buckle element 71 is in buckle fit with the buckle shaft i 32111 on the driving rod 321. Since the driving rod 321 is fixed on the plunger 32, locking the driving rod 321 corresponds to locking the plunger 32.

More specifically, the first snap fastener 71 is a pivot member, and has a first snap notch 711 and a second snap notch 712. The first snap notch 711 is in snap fit with the snap shaft i 32111. The second snap gap 712 is snap-fit with the snap end 721 of the second snap member 72.

In this embodiment, the buckle assembly 7 locks the movable iron core 32 by locking the driving rod 321, but the movable iron core 32 may also be directly locked to complete the locking of the movable iron core 32.

Example two

Fig. 4 is a schematic diagram of a second embodiment. It differs from the first embodiment in that: the driving rod 321 fixed on the movable iron core 32 is hinged with the connecting rod 4, and the connecting rod 4 is in lock fit with the buckle component 7.

The latch assembly 7 locks the plunger 32 by locking the connecting rod 4.

The connecting rod 4 comprises a first hinge part 41, a second hinge part 42 and a buckle end 43, wherein a buckle shaft II 431 is arranged on the buckle end 43, and the buckle shaft II 431 is in buckling fit with the first buckle notch 711. The first hinge portion 41 is hinged to the driving rod 321, and the second hinge portion 42 is hinged to the swing rod 51.

Fig. 5 is a graph showing the variation of the electromagnetic driving force of the electromagnet 3 and the mechanical load with the air gap length in the conventional technical scheme. In the prior art, when the buckle assembly 7 locks the connecting rod assembly, the gap distances of the movable iron core 32 of the electromagnet 3 are respectively represented as X1, X2 and X3 for the opening position of the circuit breaker, the contact position of the movable contact 11 and the fixed contact 12 and the closing in-place position of the circuit breaker, and since the position of the movable iron core 32 is affected by errors formed by transmission among parts during locking, in order to eliminate the influence of the errors and ensure the closing in place, the closing in-place position of the movable iron core needs to be advanced, and a redundant stroke for counteracting the errors is reserved to meet the requirements.

After the technical scheme related to the patent is adopted, for the opening position of the circuit breaker, the contact position of the movable contact 11 and the fixed contact 12, and the closing in-place position of the circuit breaker, the air gap distances of the movable iron core 32 of the electromagnet 3 respectively represent the positions of X1 ', X2 ' and X3 ', and because the technical scheme related to the patent greatly reduces the position error of the movable iron core 32 in the locking position, the locking position can be closer to the fixed iron core 31, and the closer to the fixed iron core 31, the greater the electromagnetic driving force of the electromagnet 3 is, so that the greater the electromagnetic driving force can be output in the working stroke of the electromagnet 3, and the closing speed of the circuit breaker is improved.

Claims

1. An air circuit breaker comprises a contact system (1), an electromagnet (3), a connecting rod (4), a main shaft (5), a brake-separating spring (6) and a hasp assembly (7); one end of the connecting rod (4) is hinged with a movable iron core (32) on the electromagnet (3), and the other end of the connecting rod is hinged with a swing rod (51) arranged on the main shaft (5); the method is characterized in that: when the breaker is switched on, the movable iron core (32) drives the connecting rod (4) to act, the connecting rod (4) drives the swing rod (51) to act, and the swing rod (51) drives the contact system (1) to perform switching-on action; after the closing state is in place, the hasp assembly (7) locks the movable iron core (32) or the connecting rod (4), so that the circuit breaker is locked in the closing state; when the breaker is opened, the hasp assembly (7) is unlocked, so that the opening spring (6) pulls the swing rod (51) and drives the contact system (1) to perform opening action.

2. An air circuit breaker according to claim 1, characterized in that: electromagnet (3) still include quiet iron core (31) and coil, move iron core (32) and establish in the coil skeleton of coil, work as coil circular telegram back, move iron core (32) downstream to external output drive power, move iron core (32) upper end be fixed with an actuating lever (321), hasp subassembly (7) with move actuating lever (321) the hasp cooperation of iron core (32).

3. The air circuit breaker according to claim 1, characterized in that: the connecting rod (4) comprises a first hinge part (41), a second hinge part (42) and a hasp end (43), a driving rod (321) is fixed at the upper end of the movable iron core (32), the first hinge part (41) is hinged with the driving rod (321), the second hinge part (42) is hinged with the swing rod (51), and the hasp component (7) is in hasp fit with the hasp end (43) of the connecting rod (4).

4. An air circuit breaker according to claim 2, characterized in that: hasp subassembly (7) include first hasp spare (71) and second hasp spare (72), first hasp spare (71) and second hasp spare (72) hasp cooperation, and first hasp spare (71) still with actuating lever (321) hasp cooperation.

5. An air circuit breaker according to claim 3, characterized in that: the buckle component (7) comprises a first buckle piece (71) and a second buckle piece (72), the first buckle piece (71) is in lock fit with the second buckle piece (72), and the first buckle piece (71) is also in lock fit with the buckle end (43).

6. An air circuit breaker according to claim 4, characterized in that: the first buckle piece (71) is provided with a first buckle notch (711) and a second buckle notch (712), a buckle shaft I (32111) is arranged on the extending end (3211) of the driving rod (321), the first buckle notch (711) is in lock fit with the buckle shaft I (32111), and the second buckle notch (712) is in lock fit with a buckle end (721) on the second buckle piece (72).

7. An air circuit breaker according to claim 5, characterized in that: first hasp piece (71) on have first hasp breach (711) and second hasp breach (712), hasp end (43) on be equipped with a hasp axle II (431), first hasp breach (711) with hasp axle II (431) hasp cooperation, second hasp breach (712) with hasp end (721) hasp cooperation on second hasp piece (72).

8. The air circuit breaker according to claim 1, characterized in that: the swing rod (51) is fixed with the main shaft (5) and rotates synchronously.

9. An air circuit breaker according to claim 1, characterized in that: the opening spring (6) is a tension spring, one end of the opening spring is connected with a fixed shaft (61) of the breaker, and the other end of the opening spring is connected with the swing rod (51).