A detecting electromagnet and a circuit breaker protection device

Abstract

The present invention belongs to the field of electromagnetic devices, and discloses a detecting electromagnet and a short-circuit protection device. The electromagnet has an electromagnet assembly, which is connected to an external main circuit and operates when receiving an abnormal signal. It further includes: a detecting winding, which is arranged inside the electromagnet assembly and generates an induced current in the magnetic field for external output. The present invention also provides a short-circuit protection device, which has the above-mentioned detecting electromagnet, and further includes a tripping mechanism and a wiring terminal arranged in the same housing. By arranging a detecting winding inside the electromagnet and leading out its pins or connection ends to cooperate with external devices, the present invention can detect the current passing through the electromagnet without changing the original functions and volume of the whole electromagnet.

Description

Technical Field

[0001] The present invention belongs to the technical field of electromagnetic devices, and particularly relates to an electromagnet and a circuit breaker protection device using the electromagnet. Background Art

[0002] An electromagnet is a device that generates an electromagnetic field when energized. Relying on an electromagnet for short-circuit protection is a commonly used method. A conductive winding matching its power is wound outside the iron core. This structure of a current-carrying coil having magnetism like a magnet is an electromagnet. In addition, in order to demagnetize the electromagnet immediately when powered off, soft iron or silicon steel materials with relatively fast demagnetization are often used for manufacturing. Such an electromagnet has magnetism when energized and the magnetism disappears when powered off.

[0003] When an electrical switch detects the operating current of the main circuit, it provides a signal through a CT installed in the main circuit. Due to the increasing integration of electrical equipment, there are already cases where CTs are integrated into large switches. There are no products using CTs integrated into miniature circuit breakers. This patent integrates a large-sized CT into the electromagnet for switch short-circuit protection, providing conditions for the intelligentization of terminal switches.

[0004] Existing electromagnet structures can be divided into various forms according to their uses and structures. Since they can receive electrical signals for operation, they can cooperate with other structures to achieve an automatic control effect. The electrical signal can be an active signal and a passive signal, that is, active control and passive control. Especially when applied in a circuit protection device, it can act in a timely manner in response to an abnormal current to cut off the circuit or achieve other functions. In the existing system, in order to detect the current information flowing through the electromagnet for data analysis or to form a closed-loop system, a separate detection component, such as a current transformer, is usually provided outside it, and its volume is relatively large and it cannot be directly installed in the original equipment. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, the present invention provides an electromagnet and a circuit breaker protection device using the electromagnet, which is optimized on the basis of the existing electromagnet structure to achieve a stable current detection function without changing its external volume and function.

[0006] The technical solution adopted by the present invention is as follows:

[0007] In a first aspect, the present invention provides a detection electromagnet having an electromagnet assembly that is connected to an external main circuit and operates when receiving an abnormal signal; further comprising:

[0008] A detection winding is arranged inside the electromagnet assembly and generates an induced current in the magnetic field for external output.

[0009] The electromagnet assembly described in the present invention includes a mechanism that can receive a current signal and generate a corresponding action after reaching the action threshold. Those skilled in the art should understand that any mechanism that can achieve the above functions and whose specific implementation is based on the principle of electromagnetic induction belongs to the protection scope of the present invention.

[0010] Meanwhile, the electromagnet structure disclosed in the present invention is applied to scenarios where the operating current needs to be detected and utilized. By cooperating with other external components, different functions can be achieved. For example, when connected to the tripping component in a circuit breaker, in addition to realizing the function of detecting its own operating current, it can also detect and record the occurrence of short-circuit current, and various parameters of the action signal can be obtained by connecting to an external circuit, so as to be processed as analysis data.

[0011] In the prior art, there are similar functions, but they are all externally set independent detection modules that can be directly connected to the main circuit for detection, and thus can be adapted to the existing electromagnet structure. In order to adapt to the requirement of a relatively small installation space as much as possible, the electromagnet provided by the present invention reduces its volume as much as possible, and integrates the detection winding inside the electromagnet to form an integrated structure. It should be understood that the electromagnet provided in this embodiment has the functional characteristics of the electromagnet itself. At the same time, in order to adapt to and meet different usage requirements, a separate output port is provided by setting the detection winding, and other functions are realized by cooperating with external devices, while the electromagnet itself only serves as an action carrier.

[0012] It is worth noting that when there is current in the main circuit inside the electromagnet assembly, there is a magnetic field, and the detection winding will also generate a certain induced current. The characteristics of the induced current are determined by the magnitude of the magnetic field, the number of turns of the detection winding, and its material properties. The present invention only limits its structure, and its size and material can be adjusted according to actual needs. Those skilled in the art can all implement this technical solution according to the content disclosed in the present invention.

[0013] It is also worth noting that the induced current generated by the detection winding can be used as an electrical signal for external detection current detection and analysis, so as to indirectly obtain the main circuit current information of the electromagnet assembly connected thereto.

[0014] Or the induced current directly enters other external components after amplification to achieve actions for realizing different functions.

[0015] Combined with the first aspect, the present invention provides the first implementation manner of the first aspect, wherein the above-mentioned detection winding is connected to an external detection circuit to form a loop.

[0016] It is worth noting that the induced current generated by the detection winding is captured and detected by the main circuit current.

[0017] The detected winding is a columnar winding structure formed by a single enameled wire, and its head and tail ends can extend to the same position to protrude from the electromagnet assembly to form connection ports, and the detection purpose is achieved by being connected in series to an external detection circuit.

[0018] Combined with the first implementation manner of the first aspect, the present invention provides a second implementation manner of the first aspect, wherein the above-mentioned electromagnet assembly includes:

[0019] A power winding, which forms a loop when connected to the main circuit; and

[0020] A yoke that confines the magnetic field formed by the power winding within it;

[0021] The detected winding is arranged within the yoke.

[0022] It is worth noting that an electromagnet includes various structures, but the structure that generates a magnetic field in it is a winding structure, and a magnetic field is formed by passing an electric current through connecting to an external main circuit. And the yoke is a structure composed of a soft magnetic material, which is used to limit and guide magnetic induction lines so that they are confined within a certain range.

[0023] In order to improve the detection accuracy, the detected winding is arranged within the yoke, which can better generate induced current. Those skilled in the art should understand that within the protection scope defined by it, any structure in which the detected winding is arranged within the yoke in an electromagnet structure having a power winding and a yoke belongs to this protection scope.

[0024] Combined with the second implementation manner of the first aspect, the present invention provides a third implementation manner of the first aspect, wherein the power winding and the detected winding are arranged at the same position.

[0025] It is worth noting that the power source of the electromagnet is the current passing through the power winding, and a soft magnetic material is arranged within the power winding and can be magnetized to have polarity, so as to achieve different action requirements. And the detected winding in the present invention generates induced current within the magnetic field generated by the soft magnetic material itself. Therefore, in order to further improve the detection accuracy, arranging it at the position of the power winding can have a relatively large magnetic induction intensity.

[0026] Combined with the second implementation manner of the first aspect, the present invention provides a fourth implementation manner of the first aspect, wherein the power winding is arranged within the yoke, and the detected winding is arranged inside the power winding.

[0027] Combined with the first aspect, the present invention provides a fifth implementation manner of the first aspect, wherein the electromagnet assembly is a push-type structure, which includes a rod-shaped power part, and both the power winding and the detected winding are sleeved on the power part and are isolated by an insulator.

[0028] It should be noted that the so-called push-type structure is a rod-shaped structure made of soft magnetic material arranged in the power winding. When an electric current passes through the power winding, a magnetic field is formed by itself, and through corresponding structural settings, when the magnetic induction intensity reaches a certain threshold, its limiting force can be broken through to complete corresponding actions. Since the winding itself is wound around a fixed structure, that is, an insulator structure, it can be well adapted to the rod-shaped power part and the space utilization rate can be improved as much as possible.

[0029] Combined with the fifth implementation manner of the first aspect, the present invention provides a sixth implementation manner of the first aspect, wherein the power part includes a static iron core, a moving iron core and a push rod arranged coaxially;

[0030] After the power winding generates a magnetic field, the moving iron core has a tendency to attract to the static iron core and push the push rod outwards.

[0031] It should be noted that the moving iron core has a certain external limiting force to prevent it from misoperation. Only when a sufficient large power is generated can it overcome its external limiting force to perform actions.

[0032] There is a spring between the moving iron core and the static iron core. When an electric current passes through the main circuit coil wound outside the iron core, a magnetic flux is generated in the magnetic yoke, and the magnetic force lines form a magnetic flux loop through the space (magnetic resistance) between the moving iron core and the static iron core. The magnetic attraction force between the moving iron core and the static iron core is much smaller than the spring force between the moving iron core and the static iron core. Although the moving iron core is pushed by the alternating magnetic force, it still remains in a stable state under the continuous thrust provided by the spring. A secondary coil is added in the magnetic yoke. Under the action of the magnetic flux, the induced current of the secondary coil and the current of the primary coil of the main circuit are in a linear proportional relationship. When a short-circuit current appears in the main circuit (more than 5 times the rated current), the electromagnetic attraction force between the moving iron core and the static iron core is much greater than the spring force, and the moving iron core quickly moves and attracts to the static iron core, and the following situations occur:

[0033] (1) Since the magnetic resistance between the moving iron core and the static iron core disappears, the magnetic flux increases rapidly, and the induced current of the secondary coil also increases rapidly. Since the induced current of the secondary coil is only used in the rated operating current range, the instantaneous increase in the induced current of the secondary coil does not affect the use;

[0034] (2) When the moving iron core quickly moves towards the static iron core, the ejector rod of the moving iron core hits the tripping mechanism at the same time, and the main circuit is disconnected simultaneously.

[0035] Combined with the sixth implementation manner of the first aspect, the present invention provides a seventh implementation manner of the first aspect, wherein the magnetic field generated by the attraction between the moving iron core and the static iron core is sufficient to make the detection winding generate an induced current reaching the detection threshold.

[0036] Combined with the fifth implementation manner of the first aspect, the present invention provides an eighth implementation manner of the first aspect, wherein the insulator includes:

[0037] A first insulator that isolates the detection winding from the power part; and

[0038] A second insulator that isolates the detection winding from the power winding.

[0039] On the other hand, the present invention also provides a short - circuit protection device, which has the detection electromagnet in the first aspect above, and further includes a tripping mechanism and a terminal block arranged in the same housing.

[0040] The beneficial effects of the present invention are as follows:

[0041] (1) By providing a detection winding inside the electromagnet and leading out its pins or connection ends to cooperate with external devices, the present invention realizes the detection of the current passing through the electromagnet without changing the original function and volume of the whole electromagnet;

[0042] (2) Through the provided double - layer insulating sleeve structure, the present invention can effectively isolate the two windings from each other, so that they do not affect each other, thereby realizing stable detection. Description of the Drawings

[0043] Figure 1 is a side view of the electromagnet assembly provided by the present invention for the embodiment part;

[0044] Figure 2 is the present invention for the embodiment part Figure 1 is a schematic cross - sectional view of the electromagnet assembly after being cut along the A - A cutting line on the basis of;

[0045] Figure 3 is an overall axonometric view of the electromagnet assembly provided by the present invention for the embodiment part;

[0046] Figure 4 is an exploded view of the main functional components of the electromagnet assembly provided by the present invention for the embodiment part;

[0047] Figure 5 is a schematic diagram of the state when there is a gap in the middle of the magnetic induction lines between the static iron core and the moving iron core inside the electromagnet assembly provided by the present invention for the embodiment part;

[0048] Figure 6 is a schematic diagram of the state when the magnetic induction lines between the static iron core and the moving iron core inside the electromagnet assembly provided by the present invention for the embodiment part are in contact;

[0049] In the figure: 1 - yoke, 2 - power winding, 3 - push rod, 4 - static iron core, 5 - moving iron core, 6 - detection winding, 7 - first insulator, 8 - second insulator, 9 - contact. Detailed Embodiment

[0050] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0051] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Components of the embodiments of the present application generally described and illustrated in the drawings herein can be arranged and designed in a variety of different configurations.

[0052] Therefore, the detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0053] It should be noted that: like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0054] In the description of the present application, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application. In addition, in the description of the present application, if terms such as "first", "second", etc. are used only for distinguishing descriptions, they cannot be understood as indicating or implying relative importance.

[0055] In addition, in the description of the present application, if terms such as "horizontal" and "vertical" are used, it does not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0056] In the description of the present application, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", and "coupled" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0057] Embodiment 1:

[0058] In this embodiment, an electromagnet is disclosed, which is applied in a circuit protection device, connected to the main circuit, and can be regarded as a conductor structure with negligible resistance value, neither affecting the current passing through the main circuit, while being able to monitor the current of the main circuit in real time, and also being able to act immediately once exceeding a certain threshold, or give an external warning, or directly cooperate with other mechanical structures to control the on-off of the circuit.

[0059] Specifically, it includes an electromagnet assembly and a detection winding 6 arranged inside the electromagnet assembly. The electromagnet assembly includes an actuating member, a yoke 1, and a power winding 2.

[0060] The principle is as follows: The actuating member is made of soft magnetic material, and this structure can be magnetized in a magnetic field and generate a tendency to move. Once the repulsive or attractive force it receives from the magnetic field exceeds the restraining force on it, the actuating member will act.

[0061] Among them, the power winding 2 is arranged inside the yoke 1 structure and connected in series in the main circuit. There is a continuous and stable current in the main circuit of this embodiment. By "stable" it means that even if the current passing through the main circuit is a fluctuating value, the magnetic field generated when the current at the peak passes through the power winding 2 cannot cause the actuating member to act. Then only in the case of a short-circuit current or other over-current situations, the current passing through the power winding 2 can cause the actuating member to act. For the electromagnet assembly, it has reversibility, that is, after acting, when its current weakens and returns to normal, the actuating member can return to the initial position under the action of the restraining force.

[0062] Furthermore, the detection winding 6 in this embodiment is an enameled wire, the same as the power winding 2, and is arranged inside the yoke 1 structure. Since the yoke 1 structure also uses soft magnetic material, it can confine the magnetic induction lines inside it after the power winding 2 generates a magnetic field.

[0063] Furthermore, in order to improve the detection accuracy, the number of turns of the detection winding 6 is much larger than that of the power winding 2, and its cross-sectional area is much smaller than that of the power winding 2, so that its volume can be reduced as much as possible. Similarly, the detection winding 6 and the power winding 2 are arranged at the same position, and are isolated by the provided insulating material to avoid mutual influence.

[0064] In this embodiment, the detection winding 6 is a coil structure formed by a single enameled wire. Its head and tail ends extend towards the middle, or one end extends towards the other end, and then are led out outward at the same position and connected to an external detection circuit to form a loop.

[0065] The detection circuit in this embodiment has a rectification and amplification module, which can detect the induced current generated by the detection winding 6 and send the information outward.

[0066] Embodiment 2:

[0067] This embodiment discloses an integrated electromagnet structure, which specifically includes a housing and an electromagnet assembly arranged inside the housing.

[0068] Among them, the electromagnet assembly includes an armature, an iron core, and a power winding 2. The power winding 2 is an enameled wire, which is wound around the outside of the iron core, and the power winding 2 is connected in series in an external main circuit.

[0069] There is a certain distance between the armature and the iron core. It is movably connected to the iron core through an insulating structure, and a natural magnet is provided on the armature. After the natural magnet is attracted or repelled, the armature is driven to move, so as to cooperate with external components of the housing to achieve an electric control effect.

[0070] The iron core is made of soft magnetic material and is magnetized when current passes through the power winding 2, generating a magnetic field inside it. Due to the characteristics of the soft magnetic material, this iron core can not only be magnetized to have polarity, but also can confine magnetic induction lines within it.

[0071] And the electromagnet with polarity can attract or repel the armature. Once the attraction or repulsion force is greater than the restraint force of the armature, the armature moves. In this embodiment, a spring is provided inside the housing to provide a continuous restraint force to the armature, so that it can return to the initial position when the attraction or repulsion force received is insufficient.

[0072] Specifically, the power winding 2 in this embodiment is arranged on the rod-shaped part of the iron core and is isolated from the iron core by a provided insulating sleeve. Another coil structure: the detection winding 6 is also provided between the iron core and the insulating sleeve.

[0073] This detection winding 6 is also formed by winding a single enameled wire. Its number of turns is much higher than that of the power winding 2, and its cross-sectional area is much smaller than that of the power winding 2, resulting in the fact that this layer of detection winding 6 occupies a small space, and by adjusting the cross-sectional diameters of the iron core and the insulating sleeve, its volume does not change significantly compared with the existing electromagnet structure.

[0074] The head and tail ends of the detection winding 6 penetrate from the same position and are connected to a PCB board provided inside the housing, and the detection circuit integrated on the PCB board is used to detect the induced current generated by this winding.

[0075] Since the power winding 2 is connected in series to the external main circuit, and the main circuit in this embodiment is used to supply power to the load device, and the electromagnet in this embodiment also cooperates with other external components, and this component is the trip switch provided on the main circuit. When there is a continuous overload current in the main circuit, the power winding 2 causes the iron core to generate sufficient magnetic force, causing the armature to actuate. At this time, since a magnetic field is formed in the iron core, according to the principle of electromagnetic induction, a certain induced current will be generated in the detection winding 6 wound around it, and after being detected by the detection circuit, the parameters will be sent out in a wired or wireless manner. The background server will analyze this operation information and adjust the system after troubleshooting, so as to prevent the same failure from occurring again.

[0076] Embodiment 3:

[0077] This embodiment provides an integrated electromagnet structure, as Figures 1-4 shown, specifically a push rod 3 type electromagnet provided in a circuit breaker.

[0078] In Figure 1 it can be seen that it includes an electromagnet assembly and a contact 9. The contact 9 in this embodiment is a static contact, which is used to cooperate with the moving contact of the trip mechanism in the circuit breaker to achieve on-off.

[0079] The electromagnet assembly includes an external yoke 1, a iron core is fixed inside the yoke 1, and the power winding 2 is wound around the outside of the iron core.

[0080] Figure 1 In

[0081] In Figure 2 and 4 it can be seen that the left bending part is the contact 9 part, which is connected to the left end of the power coil on the electromagnet assembly. And the right metal sheet is connected to another terminal in the circuit breaker. When the moving contact and the static contact are in contact and conducting, the entire power winding 2 is connected in series to the external main circuit connected to this circuit breaker.

[0082] Among them, a through hole is provided at the center position inside the static iron core 4, and the push rod 3 is arranged in this through hole and can slide along the axis of this through hole. One end of the push rod 3 is connected to the moving iron core 5. When the moving iron core 5 moves, it will push the push rod 3 to move at the same time. The push rod 3 extends out of the electromagnet assembly and pushes the trip mechanism in the circuit breaker to trip.

[0083] Figure 2 and Figure 4As can be seen, a first insulator 7 is sleeved outside the iron core. The first insulator 7 is of a sleeve structure and is directly sleeved outside the iron core, and its end is fixedly connected to one side of the yoke 1. A detection winding 6 is wound around the first insulator 7. The detection winding 6 is formed by winding a relatively thin single enameled wire, and its end passes through the housing and has a connection end on the housing, and is connected to an external Internet of Things module through a wire, and the current information of the detection winding 6 can be sent to the backend server in real time.

[0084] A second insulator 8 is also provided outside the detection winding 6, which is also of a sleeve structure, and a power winding 2 is arranged outside the second insulator 8. In this embodiment, the end of the second insulator 8 is fixed to the other side of the yoke 1, so as to fix the power winding 2, the moving iron core 5, the static iron core 4 and the detection winding 6 inside the yoke 1.

[0085] The operation principle of this embodiment: In the normal state, there is a continuous and stable current in the main circuit. When its current value does not reach the action threshold, the two contacts 9 in the circuit breaker are in contact to form a path. The power winding 2 magnetizes the moving iron core 5 and the static iron core 4 to have polarities. Since the polarities of the moving iron core 5 and the static iron core 4 are the same, an attractive force can be generated, making the moving iron core 5 tend to move towards the static iron core 4.

[0086] However, since a return spring is arranged between the moving iron core 5 and the static iron core 4, the moving iron core 5 has a certain limiting force. In the normal state, the attractive force between them is less than the elastic force of the return spring, and the moving iron core 5 remains fixed.

[0087] And at this time, since both iron cores form a magnetic field, when they are not in contact, the detection winding 6 in this magnetic field cannot generate enough induced current, and the current information received by the background server at this time is zero or less than the recording threshold.

[0088] When a short-circuit current appears in the main circuit, the excessive continuous current causes enough attractive force to be generated between the iron cores wound by the power winding 2, making the moving iron core 5 act. At the same time, at the moment when the moving iron core 5 and the static iron core 4 are in contact, the magnetic field is sufficient to make the induced current generated in the detection winding 6 detectable, so that the current data can be fed back to the background server for data analysis when disconnected.

[0089] Among them Figure 5 and Figure 6 are used to show the magnetic induction line states of the moving iron core 5 and the static iron core 4 in two states. As previously described, since there is a gap between the moving iron core 5 and the static iron core 4, the magnetic flux is provided by the external power winding 2, and a magnetic field is generated at the gap after being connected by the soft magnetic body. The total magnetic flux in the magnetic circuit is conserved, but the magnetic flux density at the gap is relatively reduced because part of the magnetic flux is lost at the non-gap part, that is, magnetic leakage, resulting in the magnetic resistance in the magnetic circuit.

[0090] When the two cores are attached together, an integrated core structure is formed for a short time, causing the magnetic leakage to disappear, while the magnetic flux density in the passive detection winding 6 increases rapidly, causing the induced current generated by it to increase at the same time.

[0091] It is worth noting that the circuit breaker structure in this embodiment is relatively small in size and cannot directly install the current transformer set on the line. The detection winding 6 used is directly wound in the electromagnet assembly, and its volume is not changed compared with the existing structure, which can meet the installation requirements of a small space. However, an independent circuit board can also be provided inside the housing of the circuit breaker, and the detection winding 6 is connected to the circuit board to form a detection loop, so as to directly obtain the current parameters and send them outward.

[0092] Embodiment 4:

[0093] The present embodiment discloses a circuit breaker protection device, including a wiring terminal, a trip assembly, an operating handle, an electromagnet, and an arc extinguishing assembly.

[0094] The terminals are connected in series to the main circuit, and the internal terminals, electromagnets and arc extinguishing components are connected in sequence to form a series circuit. The operating handle is connected to the tripping mechanism and can control the tripping mechanism to switch on and off. A moving contact is provided at the bottom of the tripping mechanism, and a static contact is provided on the electromagnet component. Under normal conditions, the moving contact and the static contact are connected in contact.

[0095] The electromagnet in this embodiment adopts the electromagnet structure in the above-mentioned embodiments 1-3, and an independent PCB circuit board is provided inside the circuit breaker, on which a detection circuit and a wireless transmission module are integrated. The circuit board is powered by an external main circuit. The detection circuit is connected to the detection winding 6 in the electromagnet to form a loop, which can process the detected current information and send it outward.

[0096] The present invention is not limited to the above optional implementations, and anyone can derive other various forms of products under the enlightenment of the present invention. The above specific implementations should not be understood as limiting the scope of protection of the present invention. The scope of protection of the present invention should be based on the definition in the claims, and the description can be used to interpret the claims.

Claims

1. A detecting electromagnet, comprising a housing and an electromagnet assembly disposed within the housing, which is connected to an external main circuit and operates when receiving an abnormal signal; characterized in that, It further includes: A detection winding (6), which is arranged inside the electromagnet assembly and generates an induced current in the magnetic field for external output; The detection winding (6) is connected to an external detection circuit to form a loop; The head and tail ends of the detection winding (6) penetrate out from the same position and are connected to a PCB board provided inside the housing, and the detection circuit integrated on the PCB board is used to detect the induced current generated by the winding; The electromagnet assembly is of a push type structure, which includes a rod-shaped power part, and both the power winding (2) and the detection winding (6) are sleeved on the power part and isolated by an insulator; The power part includes a static iron core (4), a moving iron core (5) and a push rod (3) arranged coaxially; After the power winding (2) generates a magnetic field, the moving iron core (5) has a tendency to attract to the static iron core (4) and push the push rod (3) outwards; The magnetic field generated when the moving iron core (5) attracts to the static iron core (4) is sufficient to cause the detection winding (6) to generate an induced current reaching the detection threshold; 2. The detecting electromagnet according to claim 1, wherein The electromagnet assembly includes: A power winding (2), which is connected to the main circuit to form a loop; and A magnetic yoke (1), which confines the magnetic field formed by the power winding (2) inside it; The detection winding (6) is arranged inside the magnetic yoke (1); 3. The detecting electromagnet according to claim 2, wherein The power winding (2) and the detection winding (6) are arranged at the same position; 4. A detecting electromagnet according to claim 2, characterized in that, The power winding (2) is arranged inside the magnetic yoke (1), and the detection winding (6) is arranged inside the power winding (2); 5. A detecting electromagnet according to claim 1, wherein The insulator includes: A first insulator (7), which isolates the detection winding (6) from the power part; and A second insulator (8), which isolates the detection winding (6) from the power winding (2); 6. A short-circuit protection device, characterized in that: The detection electromagnet having any one of the above claims 1-5 further includes a tripping mechanism and a terminal block arranged in the same housing.

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