Split-phase molded case circuit breaker

Abstract

The utility model discloses a split-phase molded case circuit breaker, which comprises a base, a middle cover and an upper cover, the base is provided with a three-phase chamber, each phase is provided with an opening and closing operation mechanism, a draw bar, a moving contact, a static contact, an arc extinguish chamber and a tripping device, the tripping device comprises a controller, a current transformer and a magnetic flux tripper, the controller is installed on the upper cover, and the current transformer is installed on the upper cover. A mounting groove I used for a current transformer is formed in the position, above a wiring terminal, of the lower portion of the base, a magnetic flux release is arranged on the middle cover, the movable end of the magnetic flux release makes movable contact with the traction rod, and the current transformer and the magnetic flux release are both connected with the controller. When the lower end of the circuit breaker is a single-phase load and one phase of circuit breaks down, only one power supply with the fault can be cut off, and normal power utilization of the other two circuits is not affected; a three-phase trial jump button can perform independent test tripping on a mechanism of each phase, and the action reliability of the circuit breaker is verified.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, and specifically relates to a split-phase molded case circuit breaker. Background Art

[0002] A molded case circuit breaker is a device used for long-time overload and instantaneous short-circuit. Its operating mechanism includes a closing and opening operating mechanism, a latch, and a traction rod. When tripping, the traction rod in the base is triggered to rotate, and the traction rod will drive the latch to act, so that the closing and opening operating mechanism is tripped, thereby realizing the three-phase automatic opening of the circuit breaker. Currently, most of the molded case circuit breakers on the market are of the three-phase synchronous breaking form, that is, when the traction rod is triggered, the operating mechanism drives the three-phase contacts to close and open synchronously. In the actual application process, when the user's product demand is a distribution system with single-phase loads, when a fault or arrears occurs in a certain single-phase load at the lower end of the circuit breaker and needs to be cut off, it is impossible to realize the separate control and power-off of this load. Therefore, the current circuit breaker structure form obviously cannot meet this use requirement. Summary of the Utility Model

[0003] The purpose of the utility model is to solve the above technical problems, and provide a new type of split-phase molded case circuit breaker with reasonable structural design, which is provided with three-phase independent tripping devices and can automatically cut off the faulty power supply of one path without affecting the normal power consumption of the other two paths.

[0004] In order to achieve the above invention purpose, the technical solution adopted by the utility model is as follows:

[0005] A new type of split-phase molded case circuit breaker includes a base, a middle cover, and an upper cover. The base is provided with three-phase chambers, and each phase is provided with a closing and opening operating mechanism, a traction rod, a moving contact, a static contact, and an arc extinguishing chamber. Each phase also includes a tripping device. The tripping device includes a controller, a current transformer, and a flux tripping device. The controller is installed on the upper cover. An installation groove Ⅰ is provided above the lower terminal of the base for the current transformer. An installation groove Ⅱ is provided at a position near the lower part of the traction rod in each phase of the middle cover for installing the flux tripping device. The movable end of the flux tripping device is in movable contact with the traction rod. The current transformer and the flux tripping device are both connected to the controller. When the controller issues a tripping signal, the traction rod can be triggered to realize the breaking of any phase of the circuit breaker and the excision of any faulty phase circuit.

[0006] Current transformers are installed on the three-phase current-carrying copper conductors connected to the lower terminals inside the circuit breaker base to detect the current flowing through each phase of the circuit breaker, and the controller judges and analyzes the signals of the current transformers.

[0007] The circuit breaker is also provided with three tripping buttons. Three installation holes are provided on the upper cover near the traction plate, and the tripping buttons are installed in the installation holes. The inner ends of the tripping buttons are in movable contact with the traction rod.

[0008] The closing and opening operating mechanism for each phase includes conventional existing components such as a handle, a latch, and a traction rod. When the handle is lifted upward, the operating mechanism is closed. The rotating shafts of the operating mechanisms, latches, and traction rods for the three phases are all independent rotating shafts.

[0009] The traction rod for each phase includes a rotating shaft I, a boss I, and a boss II. The boss I and the boss II are fixedly connected. The boss I is in movable contact with the flux release. When the flux release operates and strikes the boss I of the traction rod, the traction rod is triggered to move, thereby driving the closing and opening operating mechanism to trip and open;

[0010] The boss II of the traction rod is in movable contact with the trip button. When the trip button moves downward and presses on the boss II of the traction rod, the traction rod is triggered, and the rotation of the traction rod drives the closing and opening operating mechanism to trip and open.

[0011] The beneficial effects of the present utility model are as follows: Compared with the traditional molded case circuit breaker, the operating mechanism of this molded case circuit breaker can achieve independent control of closing and opening for each phase; when the lower end of the circuit breaker is a single-phase load and a fault occurs in one of the phase circuits, only the faulty power supply can be cut off, without affecting the normal power consumption of the other two phases; the three-phase test trip buttons can perform separate test trips on the mechanisms of each phase to verify the reliability of the circuit breaker operation. Description of the Drawings

[0012] Figure 1 It is a schematic structural diagram of an embodiment of the present utility model;

[0013] Figure 2 It is a schematic structural diagram of the base of an embodiment of the present utility model;

[0014] Figure 3 It is a schematic diagram of the position of the flux device of the present utility model;

[0015] Figure 4 It is a schematic diagram of the position of the trip button;

[0016] Figure 5 It is a schematic structural diagram of the traction rod.

[0017] 1 - Base, 2 - Middle cover, 3 - Upper cover, 4 - Handle 4, 5 - Controller 5, 6 - Trip button 6, 7 - Traction rod 7, 8 - Arc extinguishing chamber 8, 9 - Current transformer 9, 10 - Flux release 10, 11 - Closing and opening operating mechanism, 12 - Boss I, 13 - Boss II, 14 - Card joint. Detailed Embodiment

[0018] As shown in the attached Figures 1-5A split-phase molded case circuit breaker as shown, which includes a base 1, a middle cover 2, and an upper cover 3. The middle cover is fixedly connected above the base, and the upper cover is fixedly connected above the middle cover. There are three handles 4. The base 1 is provided with three-phase chambers, and each phase is provided with a closing and opening operating mechanism 11, a traction rod 7, a moving contact, a static contact, an arc extinguishing chamber 8, and a tripping device. The tripping device includes a controller 5, a current transformer 9, and a flux tripping device 10. The controller 5 is installed on the upper cover. An installation groove I is provided above the lower terminal of the base for the current transformer 9. An installation groove II is provided at a position near the lower part of the traction rod 7 in each phase of the middle cover for installing the flux tripping device 10. The movable end of the flux tripping device 10 is in movable contact with the traction rod 7. The current transformer 9 and the flux tripping device 10 are both connected to the controller 5. When the controller 5 issues a tripping signal, the traction rod 7 can be triggered to achieve the breaking of any phase of the circuit breaker and the excision of any faulty circuit phase.

[0019] The current transformer 9 is installed on the three-phase current-carrying copper conductors connected to the lower terminals inside the circuit breaker base to detect the current flowing through each phase of the circuit breaker. The controller 5 judges and analyzes the signals of the current transformer 9.

[0020] The circuit breaker is also provided with three tripping buttons 6. Three installation holes are provided on the upper cover near the traction plate, and the tripping buttons 6 are installed in the installation holes. The inner ends of the tripping buttons 6 are in movable contact with the traction rod 7.

[0021] The closing and opening operating mechanism 11 of each phase includes conventional existing components such as a handle 4 and a latch, and the specific structure and connection relationship will not be repeated. The handle 4 drives the operating mechanism to close upward. The operating mechanisms, latches, and the rotating shafts of the traction rods 7 of the three phases are all independent rotating shafts.

[0022] Each phase of the traction rod 7 includes a rotating shaft I, a convex platform I 12, and a convex platform II 13. The convex platform I 12 and the convex platform II 13 are fixedly connected. The convex platform I 12 is in movable contact with the flux tripping device 10. When the flux tripping device 10 acts and strikes on the convex platform I 12 of the traction rod, the traction rod 7 is triggered to act, thereby driving the closing and opening operating mechanism to trip and open.

[0023] The convex platform II 13 of the traction rod is in movable contact with the tripping button 6. When the tripping button 6 moves downward and presses on the convex platform II 13 of the traction rod, the traction rod 7 is triggered, and the rotation of the traction rod drives the closing and opening operating mechanism to trip and open.

[0024] The traction rod 7 is also fixedly provided with a conventional component clamping head 14. The clamping head 14 is clamped with the latch of the prior art component. When the traction rod 7 is triggered to rotate, the clamping head is separated from the latch, and then the closing and opening operating mechanism trips.

[0025] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, several improvements can be made without departing from the principle of the present utility model, and these improvements should also be regarded as the protection scope of the present utility model without creative efforts.

Claims

1. A phase-splitting molded case circuit breaker, comprising a base, a middle cover and an upper cover, wherein the base is provided with a three-phase chamber, and each phase is provided with a switch-on and switch-off operating mechanism, a traction rod, a moving contact, a static contact and an arc extinguishing chamber, characterized in that: It also includes a tripping device, which includes a controller, a current transformer, and a flux release. The controller is installed on the upper cover, and a mounting groove I is provided above the lower terminal of the base for the current transformer. Each phase of the middle cover is provided with a mounting groove II near the lower position of the traction rod for installing the flux release. The movable end of the flux release is in active contact with the traction rod, and the current transformer and the flux release are both connected to the controller.

2. The phase-splitting molded case circuit breaker according to claim 1, characterized in that: A current transformer is installed on the three-phase current-carrying copper wire connected to the lower wiring terminal inside the circuit breaker base to detect the current flowing through each phase of the circuit breaker.

3. The phase-splitting molded case circuit breaker according to claim 1, characterized in that: The circuit breaker is also provided with three tripping buttons. The upper cover is provided with three mounting holes near the traction plate. The tripping buttons are mounted on the mounting holes. The inner ends of the tripping buttons are in active contact with the traction rod.

4. The phase-splitting molded case circuit breaker according to claim 1, characterized in that: The traction rod comprises a rotating shaft I, a boss I and a boss II. The boss I and the boss II are fixedly connected. The boss I is in active contact with the magnetic flux release. The magnetic flux release strikes the boss I of the traction rod to trigger the traction rod to move, thereby driving the opening and closing operating mechanism to release and open the gate. The traction rod boss II is in active contact with the trip button, and the trip button moves downward and presses on the traction rod boss II, triggering the traction rod. The rotation of the traction rod drives the opening and closing operating mechanism to trip and open the gate.

Images