Protective devices for electrical equipment and electrical equipment

Abstract

This application relates to a protective device for electrical equipment and the electrical equipment itself. It belongs to the field of high-frequency electromagnetic protection and is particularly suitable for high-frequency operating environments. The protective device is at least partially conductive and is configured to short-circuit the plug of the electrical equipment in a changing magnetic field. Addressing the problem that existing electrical equipment is susceptible to damage to electronic components due to electromagnetic induction in high-frequency magnetic fields, this protective device, being at least partially conductive, forms a low-impedance bypass loop for the plug of the electrical equipment in a changing magnetic field. This bypass diverts the induced electromotive force generated by electromagnetic induction in the high-frequency magnetic field, thereby preventing excessive voltage from being conducted to the internal electronic components of the electrical equipment, protecting the equipment from electromagnetic interference and damage, and also improving the electromagnetic compatibility and reliability of the equipment.

Description

Technical Field

[0001] This application relates to the field of high-frequency electromagnetic protection technology, and in particular to a protective device for electrical equipment and electrical equipment. Background Technology

[0002] In high-frequency electromagnetic field operating environments (such as high-frequency welding and medical magnetic resonance imaging equipment), the power plugs of electrical equipment are exposed to a high-frequency varying magnetic field of 10kHz~100MHz. A closed loop forms between the two poles of the plug, generating an induced electromotive force. Experiments show that the induced voltage between the poles of an unprotected plug can reach 35-120V, far exceeding the tolerance limit of general electronic components, thus causing overvoltage damage to the electronic components. Current plug protection devices only focus on physical protection, i.e., isolating or fixing the plug with insulating materials to prevent loosening and scratching. However, they cannot eliminate the problem of electronic components being damaged due to the closed potential difference in the power plug of electrical equipment under high-frequency electromagnetic field operating environments.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0004] Therefore, it is necessary to provide a protective device and electrical equipment to address the problem that in high-frequency electromagnetic field environments, the power plugs of electrical equipment may generate excessively high voltage due to the high-frequency changing magnetic field, far exceeding the tolerance limit of electronic components, leading to overvoltage damage to the internal electronic components of the equipment.

[0005] In a first aspect, a protective device for electrical equipment includes:

[0006] The protective device is at least partially conductive and is configured to short-circuit the plug of the electrical equipment in a changing magnetic field.

[0007] In one embodiment, the protective device includes a housing and a conductor. The housing has a plug cavity for removably fitting onto the plug of the electrical device. The conductor is conductive and connected to the housing, and simultaneously contacts both poles of the plug to form a short circuit.

[0008] In one embodiment, the conductor is located within the insertion cavity.

[0009] In one embodiment, the housing includes a plug-in portion and a connecting portion connected together. The plug-in portion is disposed on both sides of the connecting portion along a first direction, and the plug-in portion is recessed with the plug-in cavity along a second direction. The first direction and the second direction intersect.

[0010] In one embodiment, the conductor is connected to the connection portion and located outside the plug cavity, the conductor extends along the first direction, and the two ends of the conductor along the first direction respectively contact the two poles of the plug.

[0011] In one embodiment, the conductor includes two first portions and a second portion. The first portions are disposed on both sides of the second portion along the first direction. One end of the first portion along its own length direction is connected to one end of the second portion along the first direction. The other end of the first portion extends along the second direction. The first portion is located inside the insertion cavity, and the second portion is located outside the insertion cavity and can abut against the connection portion.

[0012] In one embodiment, the plug portion has a limiting structure on the side wall near the connector portion along the first direction, and the conductor further includes a third portion, one end of the third portion along the first direction is connected to one end of the first portion away from the second portion along its own length direction, and the other end of the third portion along the first direction extends toward the first portion on the opposite side, and the limiting structure is used to restrict the movement of the third portion along the second direction.

[0013] In one embodiment, the first portion is tilted relative to the second portion in a direction away from the other first portion along the first direction.

[0014] In one embodiment, the inner wall of the insertion cavity on the side of the insertion portion near the connecting portion is provided with a first groove, the first groove being used to accommodate the first portion; and / or, the connecting portion is provided with a second groove, the second groove being used to accommodate the second portion.

[0015] In a second aspect, an electrical device includes a device body and a protective device, the device body having a plug, and the protective device being the same as that of the electrical device described in the first aspect, the protective device being used to short-circuit the plug when it is in a changing magnetic field.

[0016] The aforementioned protective device is at least partially conductive, enabling it to short-circuit the plug of electrical equipment in a changing magnetic field. This short-circuit creates a low-impedance loop in the plug under high-frequency conditions, allowing the conductive protective device to release the induced voltage generated by the plug in the high-frequency magnetic field, preventing the voltage from being conducted to the internal electronic components of the electrical equipment. By creating a low-impedance conduction through the short-circuited plug, the protective device eliminates the induced electromotive force, thereby preventing damage to electronic components caused by induced electromotive force when the electrical equipment is in a high-frequency operating environment. This protects the equipment from electromagnetic interference and damage, while also improving the equipment's electromagnetic compatibility and reliability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the disclosed drawings without creative effort.

[0018] Figure 1 This is a three-dimensional schematic diagram of a protective device provided in an embodiment of this application.

[0019] Figure 2 An explosion diagram of a protective device provided in an embodiment of this application.

[0020] Figure 3 This is a cross-sectional view of a protective device and a plug provided in an embodiment of this application.

[0021] Figure 4 This is a cross-sectional view of a protective device provided in an embodiment of this application.

[0022] Figure 5 This is a cross-sectional schematic diagram of a housing provided in an embodiment of this application.

[0023] Figure 6 A front view of a conductor provided for an embodiment of this application.

[0024] Figure 7 This is a perspective view of another protective device provided in an embodiment of this application.

[0025] Figure 8 A cross-sectional view of another protective device provided in an embodiment of this application.

[0026] Figure 9 for Figure 8 Enlarged view of point A in the middle.

[0027] Explanation of reference numerals in the attached drawings: 100, protective device; 200, plug; 1, housing; 11, insertion cavity; 12, insertion part; 121, limiting structure; 122, first groove; 123, second groove; 13, connecting part; 2, conductor; 21, first part; 22, second part; 23, third part. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In high-frequency electromagnetic field operating environments (such as high-frequency welding and medical magnetic resonance imaging equipment), the power plug of electrical equipment is exposed to a high-frequency changing magnetic field of 10kHz~100MHz, forming a closed loop. According to Faraday's law of electromagnetic induction, the changing magnetic field will generate an induced electromotive force in the closed loop, causing the electronic components in the electrical equipment to be damaged due to overvoltage.

[0030] Specifically, taking an air pump as an example of electrical equipment: after the air bed is inflated by the air pump, it forms a supporting structure. The air pump needs to be welded and fixed to the surface of the air bed to form an integrated structure. A high-frequency welding machine uses a high-frequency electromagnetic field to weld and fix the air pump and the air bed. When the air pump is within the range of the high-frequency electromagnetic field, its long power cord will inevitably be exposed to the changing electromagnetic field, which will induce a high voltage at the plug of the power cord, forming a closed circuit and generating a corresponding induced electromotive force. If the power cord of the air pump is tangled or not effectively electromagnetically shielded, the induced high voltage is very likely to be conducted through the power cord to the electronic components inside the air pump, causing the electronic components to break down or malfunction due to excessive voltage, thus affecting the normal operating performance of the air pump, and even causing the failure of the entire electrical system.

[0031] Based on the above issues, please refer to Figure 1 and Figure 2 and Figure 7 This application provides a protective device 100 for electrical equipment. The protective device 100 is at least partially conductive and is configured to short-circuit the plug 200 of the electrical equipment in a changing magnetic field. After the conductive protective device 100 is short-circuited with the plug 200 of the electrical equipment, the protective device 100 can provide a low-impedance bypass circuit for the plug 200 in a high-frequency changing magnetic field environment. This allows the induced electromotive force generated by electromagnetic induction in the electrical equipment in the high-frequency magnetic field to be shunt through this low-impedance bypass circuit, preventing it from being conducted to the internal electronic components of the electrical equipment, thereby protecting the internal electronic components of the electrical equipment from damage caused by excessive voltage.

[0032] In an optional embodiment, the entire protective device 100 is conductive. The protective device 100 has a metal housing, which is plugged into the plug 200 of the electrical equipment, short-circuiting the plug 200. Alternatively, a portion of the protective device 100 may be conductive; please refer to [reference needed]. Figure 2 and Figure 7 The protective device 100 includes a non-conductive housing 1 and a conductive conductor 2. The housing 1 can be made of plastic or rubber, etc. The conductor 2 is made of metal.

[0033] In optional embodiments, the connection method between the housing 1 and the plug 200 of the electrical equipment can be snap-fit, plug-in, sleeve, magnetic connection, threaded connection, etc.

[0034] It should be noted that after the housing 1 is connected to the electrical equipment, it covers the plug 200 of the electrical equipment. After the plug 200 is covered, the housing 1 can protect the plug 200 and prevent the plug 200 from being worn.

[0035] Please see Figure 2 In an optional implementation, the plug 200 of the electrical equipment may be a two-prong plug; see [link to relevant documentation]. Figure 7 The plug 200 of the electrical equipment can also be a three-prong plug. In other alternative embodiments, the plug 200 of the electrical equipment can also be a four-prong plug, a five-prong plug, etc. The embodiments of this application do not limit the specific type of the plug 200 of the electrical equipment.

[0036] The structures of the two-prong plug and the three-prong plug provided in this application will be described together below:

[0037] Please see Figure 2 and Figure 7 In some embodiments, the protective device 100 includes a housing 1 and a conductor 2. The housing 1 has a insertion cavity 11 and is detachably fitted onto the plug 200. The conductor 2 is connected to the housing 1 and simultaneously contacts both poles of the plug 200. The insertion cavity 11 in the housing 1 can accommodate the plug 200, increasing the protection area for the plug 200. The simultaneous contact of the conductor 2 with both poles of the plug 200 allows for faster and more effective conduction of the induced current generated by electromagnetic induction on the plug 200, avoiding the risk of excessive voltage damaging electronic components.

[0038] In the embodiments of this application, the first direction is the XX direction, and the second direction is the YY direction.

[0039] The conductor 2 and the housing 1 can be arranged in several ways, but are not limited to: In some embodiments, the conductor 2 is located inside the insertion cavity 11. In other words, in the embodiments of this application, the conductor 2 is entirely fixed in the insertion cavity 11. The conductor 2 is fixed to the inner wall of the insertion cavity 11. When the plug 200 is inserted into the housing 1, both poles of the plug 200 are in contact with the conductor 2 to form a short circuit under a high-frequency electromagnetic field. Further, the conductor 2 can be directly fixed laterally to the top wall of the insertion cavity 11 along the first direction (XX direction), and can contact the two poles of the plug 200 located at the bottom of the conductor 2 along the second direction (YY direction).

[0040] In other alternative embodiments, conductor 2 may be located outside the insertion cavity 11, or conductor 2 may be partially located outside the insertion cavity 11.

[0041] First, we will describe an embodiment where conductor 2 is located outside the insertion cavity 11. Please refer to [link to previous document]. Figure 3 and Figure 8 In some embodiments, the housing 1 includes a plug-in portion 12 and a connecting portion 13 connected together, the plug-in portion 12 being along a first direction (e.g., Figure 3 and Figure 8 The connecting part 13 is provided on both sides of the connecting part 13 in the direction shown in the XX direction, and the insertion part 12 is along the second direction (such as...). Figure 3 and Figure 8 A recessed insertion cavity 11 is provided in the YY direction (as shown), where the first direction intersects the second direction. During use, the insertion part 12 is fitted onto the plug 200 of the electrical equipment, achieving good stability and sealing, ensuring a tight connection between the protective device 100 and the plug 200 of the electrical equipment, preventing it from easily falling off. The connecting part 13 serves to connect and support the insertion part 12, making the entire housing 1 structure more stable.

[0042] In some embodiments, please refer to Figure 3 and Figure 8 Conductor 2 is connected to the connecting part 13 and located outside the insertion cavity 11, conductor 2 along the first direction (e.g. Figure 3 and Figure 8 Extending in the XX direction (as shown), when the plug 200 is inserted into the housing 1, the two poles of the plug 200 simultaneously abut against the two ends of the conductor 2 located outside the insertion cavity 11, and the contact pressure is sufficient to maintain the stability of the high-frequency short circuit. In other words, along the second direction (as shown in the XX direction)... Figure 3 and Figure 8 In the YY direction shown, conductor 2 is connected to the bottom of connector 13 and conductor 2 is along the first direction (as shown in the YY direction). Figure 3 and Figure 8 Extending in the XX direction shown, its extension length is configured such that when the plug 200 is inserted into the socket 21 in the second direction, the two poles of the plug 200 synchronously abut against the two ends of the conductor 2 and the contact pressure is sufficient to maintain the stability of the high-frequency short circuit to form a high-frequency short circuit path.

[0043] It is understandable that when conductor 2 is a horizontal straight strip of metal, its two ends directly contact the two poles of plug 200 through the plane to form a rigid electrical connection; when conductor 2 has elastic structures (such as beryllium copper springs or conductive silicone protrusions) at both ends, plug 200 is inserted and deforms elastically to generate contact pressure, forming a tight and stable short circuit in a high-frequency operating environment.

[0044] The following describes an embodiment where conductor 2 is located within the insertion cavity 11. Please refer to [link / reference]. Figure 4 and Figure 8 In some embodiments, conductor 2 includes two first portions 21 and second portions 22, the first portions 21 being along a first direction (e.g., Figure 4 and Figure 8 As shown in the XX direction, the first part 21 is located on both sides of the second part 22 along its own length, and one end of the first part 21 is connected to one end of the second part 22 along the first direction to form a continuous conductive path. The other end of the first part 21 is located along the second direction (as shown in the XX direction). Figure 4 and Figure 8 Extending in the YY direction (as shown); the first part 21 is located inside the plug cavity 11, and the second part 22 is located outside the plug cavity 11 and can abut against the connecting part 13. The first part 21 is located inside the plug cavity 11 and can make close contact with the plug 200, effectively receiving and dissipating the induced current on the plug 200. The second part 22 is located outside the plug cavity 11 and abuts against the connecting part 13, forming a continuous conductive path with the first part 21. When the plug 200 is inserted into the plug cavity 11, the plug 200 in the high-frequency operating environment is short-circuited through the continuous conductive path, thereby creating low-impedance conduction to eliminate induced electromotive force and avoid damage to electronic components caused by induced electromotive force in electrical equipment.

[0045] Please see Figure 5 , Figure 8 and Figure 9 In some embodiments, the sidewall of the plug portion 12 near the connecting portion 13 is along a first direction (e.g., Figure 5 and Figure 9 A limiting structure 121 is provided in the XX direction shown. Please refer to [link / reference]. Figure 4 Conductor 2 also includes a third part 23, which is along the first direction (e.g., Figure 4 and Figure 9 One end of the third part 23 (in the XX direction shown) is connected to the end of the first part 21 that is away from the second part 22 along its own length direction, and the third part 23 is along the first direction (as shown in the XX direction) Figure 4 and Figure 9 The other end of the third part 23 extends in the direction shown in the XX direction toward the opposite side of the first part 21, and the limiting structure 121 is used to limit the third part 23 along the second direction (as shown in the XX direction). Figure 4 and Figure 9(As shown in the YY direction) movement. In other words, the third part 23 extends along the first direction with two ends. One end is fixedly connected to the end of the first part 21 away from the second part 22, and the other end extends to the opposite side of the first part 21 to form a cantilever and form a snap-fit ​​with the limiting structure 121, thereby restricting the conductor 2 from moving in the second direction within the housing 1. The limiting structure 121 can more firmly connect the conductor 2 to the housing 1. This connection method restricts the movement of the conductor 2 within the housing 1, so that it can maintain a stable position even when subjected to external forces, ensuring good contact between the conductor 2 and the plug 200 and the connecting part 13, thereby improving the reliability and stability of the entire protective device 100.

[0046] Please see Figure 4 and Figure 9 The specific structure of the limiting structure 121 is not limited in the embodiments of this application. In optional embodiments, the limiting structure 121 may be a hole penetrating the side wall of the insertion part 12, or the limiting structure 121 may be a groove provided on the side wall of the insertion part 12, or the limiting structure 121 may be a protrusion provided on the side wall of the insertion part 12.

[0047] Please see Figure 4 and Figure 9 This application embodiment does not limit the location of the limiting structure 121. In an optional embodiment, the limiting structure 121 may be disposed on the side wall of the insertion portion 12 near the connecting portion 13 along the second direction (e.g., Figure 4 and Figure 9 The top of the connector (in the YY direction) or the middle of the side wall of the connector 12 along the second direction, or the bottom of the side wall along the second direction, etc.

[0048] Please see Figure 4 and Figure 9 Taking the limiting structure 121 as a locking hole, with the locking hole located at the top of the side wall of the insertion part 12 along the second direction as an example, the third part 23 passes through the locking hole 121 and abuts against the connecting part 13. When installing the conductor 2, the locking hole 121 provides a clear positioning for the third part 23, allowing the conductor 2 to be securely fixed inside the housing 1. Simply align the third part 23 with the locking hole 121 and insert it to achieve the positioning of the conductor 2 on the housing 1. Please refer to... Figure 4It is understandable that when installing conductor 2, the third part 23 is inserted into the locking hole 121, the first part 21 is engaged with both sides of the connecting part 13, and the second part 22 abuts against the connecting part 13, thereby completing the installation of conductor 2. Furthermore, when installing conductor 2 inside housing 1, the end face of the cantilever formed by the extension of the third part 23 of conductor 2 to the opposite first part 21 needs to expand outward to form an interference clamp with the side wall of the connecting part 13. At this time, the first part 21 of conductor 2 is forced to deform under the tension of the third part 23 to store elastic potential energy, and then conductor 2 is pushed inward until the cantilever of the third part 23 is engaged with the limiting structure 121. Then the first part 21 releases its elastic potential energy and recovers, so that the cantilever and the limiting structure 121 form a self-locking mechanism.

[0049] Please see Figure 4 and Figure 6 In some embodiments, the first portion 21 is relative to the second portion 22 along a first direction (e.g., Figure 4 The opening formed by the two first parts 21 (in the XX direction shown) is inclined in a direction away from the other first part 21. In other words, the opening formed by the two first parts 21 is along the second direction (as shown in the XX direction). Figure 4 The conductor 2 gradually expands in the direction away from the second part 22 (as shown in the YY direction). This arrangement of the conductor 2 facilitates its installation in the plug cavity 11. Furthermore, the two first parts 21 have gaps with the cavity wall of the plug cavity 11 along the first direction. When the plug 200 of the electrical equipment is inserted into the plug cavity 11, the plug 200 gradually abuts against the first part 21. Under the pushing force of the plug 200, the conductor 2 has a certain elasticity and gradually moves towards the cavity wall of the plug cavity 11, ensuring a tight contact between the first part 21 and the plug 200.

[0050] Please see Figure 6 In an optional embodiment, the first part 21 and the second part 22 have an included angle α that satisfies: 91°≤α≤95°. For example, the included angle α can be any value within the above range, such as 91°, 92°, 93°, 94°, 95°, etc.

[0051] Please see Figure 4 In some alternative embodiments, before the plug 200 of the electrical device is inserted into the socket 11, the two first portions 21 are aligned with the wall of the socket 11 along a first direction (e.g., Figure 4 There is a gap in the direction shown (XX direction), and the third part 23 is not fully inserted into the locking hole 121. When the plug 200 of the electrical equipment is inserted into the plug cavity 11, the plug 200 gradually abuts against the first part 21, pushing the first part 21 toward the cavity wall of the plug cavity 11. At the same time, driven by the first part 21, the third part 23 gradually inserts into the locking hole 121. That is, while completing the plug insertion process, the conductor 2 and the housing 1 are also fixed.

[0052] Please see Figure 5 and Figure 8 In some embodiments, the inner wall of the insertion cavity 11 on the side of the insertion part 12 near the connecting part 13 is provided with a first groove 122, which is used to accommodate the first part 21. Providing the first groove 122 can increase the contact area between the insertion part 12 and the first part 21, thereby improving the connection stability between the insertion part 12 and the first part 21.

[0053] Please see Figure 5 and Figure 8 In some embodiments, the connecting portion 13 is recessed with a second groove 123 for accommodating the second portion 22. Providing the second groove 123 increases the contact area between the connecting portion 13 and the second portion 22, thereby improving the connection stability between them. When the plug 200 of the electrical device is inserted into the plug portion 12, the insulator 300 of the electrical device abuts against the groove wall of the second groove 123 of the connecting portion 13, thus accommodating the second portion 22 of the conductor 2 between the second groove 123 and the insulator 300.

[0054] Please see Figure 1 Secondly, embodiments of this application provide an electrical device including a device body and a protective device 100, the device body having a plug 200. The protective device 100 is the same as the protective device for the electrical device of the first aspect. The protective device 100 is used to create low-impedance conduction for the plug 200 when it is in a changing magnetic field.

[0055] Please see Figure 2 The electrical equipment also includes a power cord, a power cord electrical connector 200, and the equipment body.

[0056] In an optional implementation, the device body may be an air pump, a medical vacuum pump, or the like.

[0057] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0058] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0059] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0060] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0061] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0062] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A protective device for electrical equipment, characterized in that, The protective device includes a housing and a conductor. The housing has a plug cavity for detachably fitting onto the plug of the electrical device. The housing may be conductive or non-conductive. The conductor is conductive and connected to the housing. The conductor is simultaneously in contact with the two poles of the plug of the electrical device in a changing magnetic field to form a short circuit.

2. The protective device for electrical equipment according to claim 1, characterized in that, The conductor is located inside the insertion cavity.

3. The protective device for electrical equipment according to claim 1, characterized in that, The housing includes a plug-in portion and a connecting portion connected together. The plug-in portion is disposed on both sides of the connecting portion along a first direction, and the plug-in portion is recessed along a second direction to form the plug-in cavity. The first direction and the second direction intersect.

4. The protective device for electrical equipment according to claim 3, characterized in that, The conductor is connected to the connection portion and located outside the plug cavity. The conductor extends along the first direction, and the two ends of the conductor along the first direction respectively contact the two poles of the plug.

5. The protective device for electrical equipment according to claim 3, characterized in that, The conductor includes two first parts and a second part. The first part is disposed on both sides of the second part along the first direction. One end of the first part along its own length direction is connected to one end of the second part along the first direction. The other end of the first part extends along the second direction. The first part is located inside the insertion cavity, and the second part is located outside the insertion cavity and can abut against the connection part.

6. The protective device for electrical equipment according to claim 5, characterized in that, The plug portion is provided with a limiting structure along the first direction on the side wall near the connection portion. The conductor also includes a third portion, one end of which is connected to the end of the first portion away from the second portion along its own length direction. The other end of the third portion extends toward the first portion on the opposite side. The limiting structure is used to restrict the movement of the third portion along the second direction.

7. The protective device for electrical equipment according to claim 5, characterized in that, The first portion is inclined relative to the second portion in the first direction away from the other first portion.

8. The protective device for electrical equipment according to claim 5, characterized in that, The inner wall of the insertion cavity on the side of the insertion part near the connecting part is provided with a first groove, the first groove being used to accommodate the first part; and / or, the connecting part is provided with a second groove, the second groove being used to accommodate the second part.

9. An electrical device, characterized in that, The electrical equipment includes a device body and a protective device. The device body has a plug, and the protective device is a protective device for electrical equipment as described in any one of claims 1 to 8, wherein the protective device is used to short-circuit the plug when it is in a changing magnetic field.

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