Controllable electromagnetic release and miniature circuit breaker

Abstract

The utility model provides a controllable electromagnetic release and a miniature circuit breaker, and relates to the technical field of circuit breakers, in order to solve the problem of rapid opening of an intelligent miniature circuit breaker in the prior art, the controllable electromagnetic release comprises a sleeve, a magnetic pushing mechanism, a first coil, a control circuit and a second coil, the first coil and the second coil are wound on the outer side of the sleeve respectively, the two ends of the first coil are connected to a load circuit, the two ends of the second coil are connected with the control circuit, when the load circuit is short-circuited, the first coil drives the magnetic pushing mechanism to cut off a power supply loop, and when the load circuit is short-circuited, the magnetic pushing mechanism drives the magnetic pushing mechanism to cut off the power supply loop. And when the control circuit controls the second coil to be electrified, the magnetic pushing mechanism cuts off the power supply loop. The controllable electromagnetic release can realize active quick release, and is minimum in occupied space and low in cost.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a controllable electromagnetic release and a miniature circuit breaker. Background Art

[0002] Miniature circuit breakers (MCBs) are currently the most widely used type of protective electrical appliances. Smart MCBs use microprocessors to achieve safe, scientific, and smart power usage, and can use a variety of communication methods to achieve remote control, which has a good market prospect.

[0003] When the micro-breaker is disconnecting the circuit with load, it is required to quickly cut off the load current, so that the opening process of the micro-breaker must meet the requirements of the capacity and speed of disconnecting the load current. Whether it is an ordinary micro-breaker or an intelligent micro-breaker, it will passively trigger the closing lock mechanism when there is overcurrent and short circuit, and use the tension spring force to drive the internal mechanism, so that the micro-breaker contacts are quickly disconnected.

[0004] However, for intelligent micro-breakers, since they are based on the premise of remote control, remote opening / closing operation is a basic operation. However, when remote load opening is required, problems arise: the opening / closing operation of intelligent micro-breakers is generally completed by rotating the micro-breaker wrench through a motor-driven gear. During the opening / closing process, the electric operating mechanism acts on the switch wrench. This process is relatively slow, and there will be no problems when closing the circuit. However, slowly separating the loaded circuit will cause the contacts of the micro-breaker to arc for a long time, burn the contacts, and cause damage to the micro-breaker. Therefore, the motor with gears slowly disconnecting the loaded circuit cannot meet the opening speed requirements of the micro-breaker.

[0005] Conventional micro-breakers have built-in electromagnetic releases to provide rapid disconnection when the line is short-circuited. The instantaneous large current generated when the micro-breaker is short-circuited generates a magnetic force, which pushes the armature inside the mechanism, thereby disengaging the micro-breaker closing lock mechanism, and using the spring force of the mechanism to quickly separate the closing contacts, thereby cutting off the circuit. This is a passive operation.

[0006] Therefore, the intelligent micro-breaker must solve the problem of rapid opening when remotely controlling the opening, so that the contacts can be quickly pulled apart to ensure the service life of the micro-breaker. Since there is not enough space inside the micro-breaker, if the micro-breaker is to be able to achieve active rapid opening, it can only be done through an external shunt release. This external shunt release increases the cost and takes up installation space. Utility Model Content

[0007] The purpose of the utility model is to provide a controllable electromagnetic release and a miniature circuit breaker to solve the problem of intelligent miniature circuit breaker rapid opening in the prior art. The controllable electromagnetic release of the utility model can realize active rapid tripping, and occupies minimal space and has low cost.

[0008] The utility model provides a controllable electromagnetic release, comprising a sleeve, a magnetic driving mechanism, a first coil, a control circuit and a second coil, wherein the first coil and the second coil are respectively wound around the outside of the sleeve, the two ends of the first coil are connected to the load circuit, and the two ends of the second coil are connected to the control circuit, when the load circuit is short-circuited, the first coil drives the magnetic driving mechanism to cut off the power supply circuit, and when the control circuit controls the second coil to be energized, the magnetic driving mechanism cuts off the power supply circuit.

[0009] As a preferred solution of the present invention, the diameter of the second coil is smaller than the diameter of the first coil.

[0010] As a preferred solution of the utility model, the electromagnetic coefficient generated by the first coil when short-circuited is equivalent to the electromagnetic coefficient generated by the second coil when energized.

[0011] As a preferred solution of the utility model, both ends of the second coil are connected to a 220V voltage, the number of turns of the second coil is more than 600, and the winding height of the second coil is less than 2 mm.

[0012] As a preferred solution of the present invention, the first coil and the second coil are alternately wound around the outside of the sleeve.

[0013] As a preferred solution of the utility model, it also includes a third coil for detecting the induced current of the micro-break load, the third coil is wound around the outside of the bushing, and the third coil is connected to the controller.

[0014] As a preferred solution of the present invention, the control circuit is connected to a control signal, a control switch is provided on the control circuit, and the control switch is connected in series with the second coil.

[0015] As a preferred embodiment of the present invention, the magnetic driving mechanism includes a pin, an elastic member and an iron core. An active cavity arranged along the axis of the sleeve is arranged inside the sleeve. One end of the pin is movably arranged in the active cavity and the other end is extended from the first end of the sleeve. The elastic member is sleeved on the pin and one end thereof abuts against the inner end surface of the pin and the other end abuts against the first end of the sleeve. The iron core is movably arranged in the active cavity along the axis of the sleeve.

[0016] The utility model also provides a miniature circuit breaker, including the controllable electromagnetic release and the closing lock mechanism, the closing lock mechanism is connected to the tension spring through a buckle, the magnetic driving mechanism can push open the buckle on the closing lock mechanism, the tension spring is released and drives the contacts of the switch to open quickly.

[0017] Compared with the prior art, the utility model has the following positive effects:

[0018] The controllable electromagnetic release provided by the utility model includes a sleeve, a magnetic driving mechanism, a first coil, a control circuit and a second coil. The first coil and the second coil are respectively wound on the outside of the sleeve, the two ends of the first coil are connected to the load circuit, and the two ends of the second coil are connected to the control circuit. When the load circuit is short-circuited, the first coil drives the magnetic driving mechanism to cut off the power supply circuit, and when the control circuit controls the second coil to be energized, the magnetic driving mechanism cuts off the power supply circuit. The controllable electromagnetic release of the utility model is based on the electromagnetic release commonly existing in micro-breaks. The first coil can generate a large electromagnetic force under the action of a short circuit, which can drive the magnetic driving mechanism to push open the micro-break closing lock mechanism and cut off the power supply circuit, which belongs to passive operation. The controllable electromagnetic release uses its original structure and small remaining space to add a second coil on the sleeve. When the second coil is energized, the control circuit can generate a considerable electromagnetic force, drive the magnetic driving mechanism to push open the micro-break closing lock mechanism, cut off the power supply circuit, and realize active and rapid tripping, which solves the problem of active remote control with load rapid disconnection of intelligent micro-breaks, and occupies minimal space and has low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the internal structure of the controllable electromagnetic release of the utility model;

[0021] Figure 2 It is the winding diagram of the outer side of the sleeve in the utility model;

[0022] Figure 3 It is the control circuit diagram of the utility model;

[0023] Figure 4 This is a winding diagram when the third coil in the utility model is wound on the outside of the sleeve;

[0024] Figure 5 This is a detection logic diagram that is responsible for the third coil in the utility model.

[0025] In the figure: 1, sleeve; 2, first coil; 3, second coil; 4, magnetic driving mechanism; 11, first end; 12, second end; 41, ejector pin; 411, push block; 412, stop block; 42, elastic member; 43, iron core; 44, movable rod; 5, control circuit; 6, third coil; 7, connecting circuit. DETAILED DESCRIPTION

[0026] In the description of the present utility model, it should be noted that, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "front end", "back end", "head", "tail" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplification, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0028] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0029] Embodiment 1:

[0030] This embodiment provides a controllable electromagnetic release, such as Figure 1-Figure 2 As shown, it includes a sleeve 1, a magnetic driving mechanism 4, a first coil 2, a control circuit 5 and a second coil 3.

[0031] The first coil 2 and the second coil 3 are respectively wound around the outside of the sleeve 1 . The first coil 2 and the second coil 3 are separated from each other so as not to interfere with each other and to reduce the occupied space.

[0032] Both ends of the first coil 2 are connected to the load circuit, and both ends of the second coil 3 are connected to the control circuit 5. When the load circuit is short-circuited, the first coil 2 drives the magnetic force driving mechanism 4 to cut off the power supply circuit, and when the control circuit 5 controls the second coil 3 to be energized, the magnetic force driving mechanism 4 cuts off the power supply circuit.

[0033] The controllable electromagnetic release of this embodiment is based on the electromagnetic release commonly found in micro-breaks. The first coil 2 can generate a large electromagnetic force under the action of short circuit, which can drive the magnetic force driving mechanism 4 to push open the micro-break closing lock mechanism and cut off the power supply circuit, which is a passive operation. The controllable electromagnetic release in this embodiment uses its original structure and small remaining space to install a second coil 3 on the bushing 1. It can generate a considerable electromagnetic force through the control circuit 5 when the second coil 3 is energized, and also drive the magnetic force driving mechanism 4 to push open the micro-break closing lock mechanism, cut off the power supply circuit, and realize active and rapid tripping, which solves the problem of active remote control load rapid disconnection of intelligent micro-breaks.

[0034] In this embodiment, the second coil 3 is cleverly designed inside the original electromagnetic release coil, which occupies a very small remaining space and does not affect the structure and function of the original 1P micro-breaker. The first coil and the second coil do not affect each other.

[0035] In this embodiment, the manufacturing cost of the intelligent micro-break can be greatly reduced from a cost perspective, the space occupied by the intelligent micro-break can be reduced, and the intelligent transformation of old distribution boxes can be facilitated, providing a good solution for the intelligent upgrade of a large number of buildings. At present, the intelligent upgrade of many old buildings is limited by the increase in the volume of the distribution box, because the structure of the current one-to-one intelligent micro-break is much larger than the micro-break itself, making it impossible to directly replace the original old micro-break. The intelligent upgrade is inevitably accompanied by the replacement of the distribution box, the adjustment of the installation position or the expansion of the installation volume, and its actual operation is difficult. The controllable electromagnetic release in this embodiment makes it possible to implement installation and replacement in the original distribution box, and the cost of the intelligent upgrade and transformation of the building will also be greatly reduced.

[0036] As a preferred implementation, the first coil 2 and the second coil 3 are wound alternately on the outside of the sleeve 1 to reduce the winding volume and reduce the mutual interference between the first coil 2 and the second coil 3 .

[0037] It should be noted that the second coil 3 may also be stacked and wound on the inner side or the outer side of the first coil 2 .

[0038] As a preferred implementation mode, Figure 1 and Figure 2 As shown, the diameter of the second coil 3 is smaller than the diameter of the first coil 2. When short-circuited, the current flowing through the first coil is much larger than the current flowing through the second coil 3 when powered, so as not to increase the circuit burden.

[0039] As a preferred implementation, the electromagnetic coefficient generated by the first coil 2 when short-circuited is equivalent to the electromagnetic coefficient generated by the second coil 3 when energized, so that the electromagnetic coefficient generated by the first coil 2 when short-circuited and the electromagnetic coefficient generated by the second coil 3 when energized can both drive the magnetic propulsion mechanism 4, thereby cutting off the power supply circuit.

[0040] As a preferred embodiment, both ends of the second coil 3 are connected to a 220V voltage, and the number of turns of the second coil 3 is more than 600. The loading current of the second coil 3 is taken from the mains power added by the micro-breaker, which reduces the additional power burden, occupies the smallest space and has the lowest cost. The number of turns of the second coil 3 varies depending on the rated load of the micro-breaker.

[0041] As a preferred embodiment, the second coil 3 is an enameled wire with a standard diameter of 0.06 mm to reduce the occupied space, and the current flowing through it is as small as possible to reduce the circuit burden.

[0042] Specifically, the second coil 3 is an ultra-fine diameter enameled wire, which may be a standard diameter of 0.06 mm. Both ends of the second coil 3 are connected to a 220V mains supply, and the number of turns of the second coil 3 is 600-1200.

[0043] As a preferred embodiment, the winding height of the second coil 3 is less than 2 mm. The winding height h of the second coil 3 can be 0.3, 0.5, 0.8 mm, etc., while ensuring the number of winding turns and minimizing the occupied volume.

[0044] The controllable electromagnetic release of this embodiment is based on the original electromagnetic release. The second coil 3 is used to achieve a magnetic force equivalent to that of the original coil. The following analysis is made:

[0045] Different micro-breakers have different rated loads, and the allowable short-circuit current will be different, and the tripping magnetic field force applied during short circuit will also be different. However, considering the general principle, the 63A micro-breaker with the maximum rated current can be selected as a model. The allowable short-circuit current of the 63A micro-breaker is generally 6 times the rated current, and the overcurrent coil of its electromagnetic release is at least 2 turns. According to the principle that the force on the iron core in the bare tube coil is proportional to the product of the coil current and the number of coil turns, the electromagnetic coefficient of the first coil of the 63A micro-breaker electromagnetic release is calculated to be 63*6*2=756. The second coil 3 in this embodiment must meet the aforementioned coefficients, and at the same time, the coil should occupy as little space as possible, and the current should be controlled to be as small as possible.

[0046] Taking the above factors into consideration, the second coil selects 0.06 standard diameter enameled wire. According to the winding environment, the winding height of the second coil is determined to be 0.5mm, the number of winding turns is 1000, and the loading current is taken from the 220V AC power added by the micro-breaker. The coil resistance is about 200 ohms, and the current passing through is about 1A. The electromagnetic coefficient of the second coil is 1*1000=1000, which is similar to the electromagnetic coefficient of the first coil mentioned above. After experiments, it is found that the magnetic power requirements for tripping are fully met.

[0047] As a preferred implementation mode, Figure 3As shown, the control circuit 5 is connected to the control signal, a control switch is provided on the control circuit 5 , and the control switch is connected in series with the second coil 3 .

[0048] The control switch is a low-power bidirectional thyristor Q2, which is driven by the "control signal" and is turned on when rapid tripping is required. The conduction of the thyristor energizes the second coil, which in turn enables the electromagnetic release to generate a strong magnetic force, driving the magnetic force driving mechanism 4 inside the sleeve to form a unidirectional force to complete the inching of the buckle.

[0049] The control circuit 5 is arranged on the control board of the original intelligent micro-breaker, and the main control terminal gives an action instruction to start the second coil 3, and the main controller is connected with the remote communication. The second coil 3 and the control circuit are all installed in the 1P micro-breaker space.

[0050] As a preferred implementation, the controllable electromagnetic release of this embodiment further includes a third coil 6 for detecting the inductive current of the micro-break load, and the third coil 6 is wound around the outside of the bushing 1. Figure 4 As shown, when the first coil and the second coil are arranged alternately, the third coil 6 can be stacked and wound on the outside of the first coil and the second coil or on the inside of the first coil and the second coil. When the second coil is stacked and wound on the inside or outside of the first coil, the third coil 6 can be stacked and wound between the first coil and the second coil or on the inside or outside of the first coil or the second coil.

[0051] like Figure 5 As shown, the third coil 6 is connected to the controller. The third coil 6 is connected to the AD converter in the controller through the connecting circuit 7. The controller can monitor the load change of the micro-break in real time.

[0052] As an intelligent micro-breaker, it is usually necessary to detect load changes. The current solution is often to add a current transformer in the micro-breaker, which also requires a separate sampling CPU, which will inevitably increase the space in the standard micro-breaker. In this embodiment, the magnetic induction mechanism of the original electromagnetic release in the micro-breaker is used to add a set of third coils 6, which conveniently and economically solves the previous space and cost problems.

[0053] As a preferred embodiment, the magnetic driving mechanism 4 includes a pin 41, an elastic member 42 and an iron core 43. An active cavity is provided in the sleeve 1 along its axis. One end of the pin 41 is movably provided in the active cavity and the other end is extended from the first end 11 of the sleeve 1. The elastic member 42 is sleeved on the pin 41 and one end thereof abuts against the inner end surface of the pin 41 and the other end abuts against the first end 11 of the sleeve 1. The iron core 43 is movably provided in the active cavity along the axis of the sleeve 1. Specifically, the two ends of the pin 41 are provided with a push block 411 and a stop block 412 respectively. The stop block 412 is slidably provided in the active cavity for docking with the iron core 43. The push block 411 extends to the outside of the first end 11 of the sleeve 1 for pushing open the micro-break closing lock mechanism.

[0054] The iron core 43 can move in the movable cavity under the action of the magnetic field and push the ejector pin 41 to overcome the elastic force of the elastic member 42 and extend toward the first end 11 of the sleeve. The end of the iron core 43 away from the ejector pin 41 is connected to the movable rod 44, which is extended from the second end 12 of the sleeve. The movable rod 44 is used to limit the moving direction of the iron core 43 and plays a role in fixing the iron core 43. The magnetic force driving mechanism 4 is an existing structure, which can make the ejector pin 41 push open the micro-break closing lock mechanism under the action of a strong magnetic force to cut off the power supply circuit.

[0055] This embodiment also provides a microcircuit device, including a controllable electromagnetic release and a closing lock mechanism, the closing lock mechanism is connected to the tension spring through a buckle, the magnetic force pushing mechanism 4 can push open the buckle on the closing lock mechanism, the tension spring is released and drives the switch contacts to open quickly. The closing lock mechanism is an existing structure in the micro terminal.

[0056] There is a locking mechanism inside the micro-breaker. When the wrench is operated to close the switch, the locking mechanism presses against the switch contacts to keep the power supply circuit connected. There is a tension spring on the locking mechanism. During the closing operation, the tension spring is tightened and caught by the buckle on the locking mechanism. When the switch is opened, the tension spring is released and returned, driving the switch contacts to open quickly, thereby cutting off the current.

[0057] like Figure 1 As shown in the figure, it is the internal structure of the micro-breaker. The principle of the electromagnetic release is that when a short circuit occurs in the load, a large short-circuit current is generated, and an electromagnetic force is generated through the first coil, which acts on the internal iron core to move to the left, pushing the ejector pin 41 to extend to the left, pushing open the buckle of the locking mechanism inside the micro-electric, releasing the tension spring, driving the circuit contacts to separate quickly, thereby cutting off the power supply circuit.

[0058] In this embodiment, a second coil is added, which is electromagnetically driven to open the buckle on the locking mechanism, operate the tension spring to release and return, and use the mechanical capacity of the micro-breaker itself to complete the opening of the gate.

[0059] In this embodiment, the second coil sleeve installation method is adopted. A second coil is sleeved near the original first coil, and the small current second coil is used to generate the corresponding magnetic field. In this way, the same principle as the micro-breaker's own precise electromagnetic release is adopted, and its mechanism is shared. In a limited space, the purpose of remote control and rapid opening is achieved. In terms of integrity, the micro-breaker's own mechanism characteristics are used, and the micro-breaker's own structure is not changed, the key components of the micro-breaker are not replaced, and the breaking speed requirements of remote control opening are achieved without adding mechanisms. The change to the micro-breaker in terms of process is very small, and the goal is achieved with the minimum cost increase. In terms of implementation, the micro-breaker's own mechanism is used, and the circuit of the micro-breaker is not affected in any way in terms of safety.

[0060] The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make several modifications and improvements without departing from the creative concept of the present invention, which should be included in the protection scope of the present invention.

Claims

1. A controllable electromagnetic release, characterized in that: The invention comprises a sleeve (1), a magnetic driving mechanism (4), a first coil (2), a control circuit (5) and a second coil (3); the first coil (2) and the second coil (3) are respectively wound around the outside of the sleeve (1); two ends of the first coil (2) are connected to a load circuit; two ends of the second coil (3) are connected to the control circuit (5); when the load circuit is short-circuited, the first coil (2) drives the magnetic driving mechanism (4) to cut off the power supply circuit; when the control circuit (5) controls the second coil (3) to be energized, the magnetic driving mechanism (4) cuts off the power supply circuit.

2. The controllable electromagnetic release according to claim 1, characterized in that: The diameter of the second coil (3) is smaller than the diameter of the first coil (2).

3. The controllable electromagnetic release according to claim 1, characterized in that: The electromagnetic coefficient generated by the first coil (2) when short-circuited is equivalent to the electromagnetic coefficient generated by the second coil (3) when energized.

4. The controllable electromagnetic release according to claim 1, characterized in that: Both ends of the second coil (3) are connected to a 220V voltage, the number of turns of the second coil (3) is more than 600, and the winding height of the second coil (3) is less than 2 mm.

5. The controllable electromagnetic release according to claim 1, characterized in that: The first coil (2) and the second coil (3) are wound alternately on the outside of the sleeve (1).

6. The controllable electromagnetic release according to claim 1, characterized in that: The control circuit (5) is connected to a control signal, and a control switch is provided on the control circuit (5), wherein the control switch is connected in series with the second coil (3).

7. The controllable electromagnetic release according to claim 1, characterized in that: It also includes a third coil (6) for detecting the inductive current of the micro-break load, the third coil is wound around the outside of the bushing (1), and the third coil (6) is connected to a controller.

8. The controllable electromagnetic release according to claim 1, characterized in that: The magnetic driving mechanism (4) comprises a pin (41), an elastic member (42) and an iron core (43); an active cavity arranged along the axis of the sleeve (1) is arranged inside the sleeve (1); one end of the pin (41) is movably arranged in the active cavity and the other end is extended from the first end (11) of the sleeve (1); the elastic member (42) is sleeved on the pin (41) and one end thereof abuts against the inner end surface of the pin (41) and the other end abuts against the first end (11) of the sleeve (1); the iron core (43) is movably arranged in the active cavity along the axis of the sleeve (1).

9. A microcircuit device, characterized in that: It comprises the controllable electromagnetic release and closing lock mechanism as described in any one of claims 1 to 8, wherein the closing lock mechanism is connected to the tension spring via a buckle, and the magnetic driving mechanism (4) can push open the buckle on the closing lock mechanism, and the tension spring is released and drives the contacts of the switch to open quickly.

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