Electromagnetic shielding box and cable testing device

Abstract

The invention relates to an electromagnetic shielding box and a cable testing device. The electromagnetic shielding box comprises a shielding body, a shielding cover, at least one switching inlet and at least one switching outlet. The shielding body is used for accommodating a to-be-tested cable, one end of the switching inlet is used for connecting one end of the to-be-tested cable, and one end of the switching outlet is used for connecting the other end of the to-be-tested cable. According to the invention, the electromagnetic shielding box is utilized to construct a local electromagnetic shielding space, so that an installation space is provided for the induced current test of the to-be-tested cable while external electromagnetic environment interference is checked; the defects that the shielding effectiveness cannot be quantitatively evaluated, repeated unification cannot be achieved, uncontrollable manual operation factors exist and the like due to the fact that the cable to be tested is temporarily bundled through a copper net are overcome.

Description

Technical Field

[0001] This application relates to the field of electromagnetic shielding technology, and particularly to an electromagnetic shielding box and a cable testing device. Background Art

[0002] With the development of aviation technology, especially the increasing application of new technologies such as electrification in the civil aviation field, it has brought unprecedented challenges to the electromagnetic protection of aircraft. To illustrate the compliance of civil aircraft with the provisions of Article 25.1317 of the Civil Aviation Regulations of China (CCAR)-25R4 (25 represents the part number of the airworthiness standard; R4 represents the revision version number of this regulation; 25.1317 is the specific clause number), it is necessary to conduct a full-aircraft high-intensity radiated fields (HIRF) ground test on the aircraft to verify the effectiveness of the aircraft's protection against the HIRF environment.

[0003] According to the definition of the Aerospace Recommended Practice (ARP) 5583A (5583A is the number and version number of this document, where "A" indicates that this is a revised version of this document) issued by the Society of Automotive Engineers (SAE), the full-aircraft high-intensity radiated fields (HIRF) ground test of an aircraft can be divided into two parts: low-level swept current (LLSC) and low-level swept field (LLSF). LLSC measures the induced current on the cable, covering the frequency range of 0.5 MHz - 400 MHz (the low-frequency starting frequency is 1 / 10 of the first resonance frequency of the aircraft), and examines the HIRF environment in the low-frequency band; LLSF measures the electric field strength inside the cabin, covering the frequency range of 100 MHz - 18 GHz, and examines the HIRF environment in the high-frequency band.

[0004] When the systems of the aircraft's Class A functions perform the LLSC induced current test and the bulk current injection (BCI) test (equivalent test scheme), they often use the flexibility and shielding characteristics of the metal copper mesh and adopt a temporary scheme of bundling and wrapping to achieve the effect of equivalent electromagnetic shielding. However, the scheme of using copper mesh for temporary bundling to achieve electromagnetic shielding has defects such as the shielding effectiveness cannot be quantitatively evaluated, cannot be repeated and unified, and there are uncontrollable human operation factors. Summary of the Invention

[0005] The embodiments of the present application provide an electromagnetic shielding box and a cable testing device, which solve the problems of using a copper mesh for temporary bundling to achieve electromagnetic shielding, such as the shielding effectiveness cannot be quantitatively evaluated, cannot be repeated and unified, and there are uncontrollable human operation factors.

[0006] To achieve the above object, the present application provides an electromagnetic shielding box, including: a shielding body having an opening, the shielding body being used to accommodate a cable to be tested; a shielding cover rotatably connected to the shielding body, the shielding cover being used to cover the opening; at least one transfer inlet provided on the shielding body, one end of the transfer inlet being used to connect to one end of the cable to be tested; and at least one transfer outlet provided on the shielding body, one end of the transfer outlet being used to connect to the other end of the cable to be tested.

[0007] In some embodiments, the shielding body includes a bottom plate and a plurality of side plates protruding from one side of the bottom plate, and at least one side plate is provided with an elastic member at one end away from the bottom plate; when the shielding cover is buckled with the shielding body, the shielding cover is pressed against the elastic member.

[0008] In some embodiments, the shielding cover includes a cover plate and a protruding portion protruding from one side of the cover plate, and when the shielding cover is buckled with the shielding body, the protruding portion is pressed against the elastic member.

[0009] In some embodiments, the elastic member is provided on the inner wall of the side plate, and the protruding portion is pressed against the side of the elastic member away from the side plate.

[0010] In some embodiments, the shielding cover is hinged to the shielding body.

[0011] In some embodiments, the electromagnetic shielding box further includes: a spring hinge, one end of the spring hinge is connected to the shielding body, the other end of the spring hinge is connected to the shielding cover, and the shielding cover is hinged to the shielding body through the spring hinge.

[0012] In some embodiments, the electromagnetic shielding box further includes: a control part, the control part is connected to the side of the shielding cover away from the shielding body.

[0013] To achieve the above object, the present application further provides a cable testing device, including: a cable to be tested and the electromagnetic shielding box of the present application, the cable to be tested is arranged in the shielding body of the electromagnetic shielding box, one end of the cable to be tested is connected to the transfer inlet of the electromagnetic shielding box, and the other end of the cable to be tested is connected to the transfer outlet of the electromagnetic shielding box.

[0014] In some embodiments, a through hole is provided on the shielding body; the cable testing device further includes: a test probe arranged in the shielding body; and a probe cable, one end of which is connected to the test probe, and the other end of which passes through the through hole and extends out of the shielding body for connection to a test device.

[0015] In some embodiments, the test probe is mounted on the cable to be tested, and the test probe is used to monitor the induced current value of the cable to be tested.

[0016] In some embodiments, the outer diameter of one end of the probe cable away from the test probe is smaller than the aperture of the through hole; the cable testing device also includes: two closing parts, respectively arranged on both sides of the probe cable, both closing parts are connected to the outer wall of the shielding body, and both closing parts are provided with a closing groove; the closing grooves on the two closing parts are combined to form a closed hole, and the probe cable is embedded in the closed hole.

[0017] In some embodiments, the cable to be tested located in the shielding body includes an unshielded cable.

[0018] The shielding body of the electromagnetic shielding box of the present application is used to accommodate the cable to be tested, one end of the transfer inlet is used to connect one end of the cable to be tested, and one end of the transfer outlet is used to connect the other end of the cable to be tested. The electromagnetic shielding box is used to construct a local electromagnetic shielding space, which can check for external electromagnetic environment interference while providing installation space for the induced current test of the cable to be tested, avoiding the defects of using copper mesh to temporarily bundle the cables to be tested, such as the inability to quantify and evaluate the shielding effectiveness, the inability to repeat and unify, and the existence of uncontrollable human operation factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0020] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0021] Figure 1 is a schematic structural diagram of the electromagnetic shielding box provided in an embodiment of the present application;

[0022] Figure 2 Schematic diagram of the structure of the shielding body, transfer inlet and transfer outlet provided in the embodiment of the present application;

[0023] Figure 3 Schematic diagram of the structure of the shielding cover and the control unit provided in the embodiment of the present application;

[0024] Figure 4 is a structural diagram of a cable testing device provided in an embodiment of the present application;

[0025] Figure 5 is a structural schematic diagram of a closure member of a cable testing device provided in an embodiment of the present application;

[0026] Figure 6 is a schematic structural diagram of the slide rail on the shielding body provided in an embodiment of the present application;

[0027] Figure 7 3 is a comparison chart of the induced current values of the embodiment of the present application and the induced current values of the comparative example.

[0028] Description of reference numerals:

[0029] 10. Electromagnetic shielding box; 20. Cable to be tested; 30. Test probe; 40. Probe cable; 50. Closure;

[0030] 1. Shielding body; 2. Shielding cover; 3. Transfer inlet; 4. Transfer outlet; 5. Spring hinge; 6. Control unit;

[0031] 11. Opening; 12. Bottom plate; 13. Side plate; 14. Elastic member; 15. Through hole; 16. Slide rail; 17. Positioning hole;

[0032] 21. Cover plate; 22. Protrusion;

[0033] 51, first page; 52, second page;

[0034] 501, closed slot; 502, closed hole; 503, mounting hole. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0036] Please also refer to Figures 1 to 3 The present invention provides an electromagnetic shielding box 10. The electromagnetic shielding box 10 includes a shielding body 1, a shielding cover 2, at least one transfer inlet 3, and at least one transfer outlet 4. To improve the electromagnetic shielding performance of the electromagnetic shielding box 10, the shielding body 1 and the shielding cover 2 can be made of a highly conductive metal material, such as copper or aluminum.

[0037] See also Figure 1 and Figure 2, the shielding body 1 is used to house the cable to be tested, and the shielding body 1 has an opening. Specifically, the shielding body 1 includes a bottom plate 12 and a plurality of side plates 13 protruding from one side of the bottom plate 12. A through hole 15 is provided on the shielding body 1, and the through hole 15 is used to allow the probe cable to pass through. In this embodiment, the shielding body 1 includes four side plates 13. The four side plates 13 protrude from the same side of the bottom plate 12 and jointly enclose a receiving cavity with the bottom plate 12. The receiving cavity is used to house the cable to be tested. The ends of the four side plates 13 away from the bottom plate 12 are combined to form an opening, which facilitates the installation of the cable to be tested and the test probe.

[0038] Please refer to Figure 1 and Figure 2 , at least one end of the side plate 13 away from the bottom plate 12 is provided with an elastic member 14. In this embodiment, the elastic member 14 is arranged on the inner wall of the side plate 13. Each end of the side plate 13 away from the bottom plate 12 is provided with an elastic member 14. When the shielding cover 2 is buckled with the shielding body 1, the shielding cover 2 is pressed against the elastic member 14. Through the cooperation design of the elastic member 14 of the shielding cover 2 and the shielding body 1, it is ensured that the shielding cover 2 is tightly linked with the shielding body 1, constituting electrical continuity and ensuring the shielding effectiveness of the electromagnetic shielding box 10.

[0039] Please refer to Figure 1 and Figure 3 , the shielding cover 2 is used to cover the opening. The shielding cover 2 is rotatably connected to the shielding body 1. That is, the shielding cover 2 can rotate relative to the shielding body 1 to realize the opening and closing of the electromagnetic shielding box 10. When the electromagnetic shielding box 10 is opened, it is convenient for the installation of the cable to be tested and the test probe; when the electromagnetic shielding box 10 is closed, it provides an electromagnetic shielding space for the cable to be tested. In this embodiment, the shielding cover 2 is hinged to the shielding body 1 to realize the rotatable connection of the shielding cover 2 to the shielding body 1. The electromagnetic shielding box 10 further includes a spring hinge 5. One end of the spring hinge 5 is connected to the shielding body 1, and the other end of the spring hinge 5 is connected to the shielding cover 2. The shielding cover 2 is hinged to the shielding body 1 through the spring hinge 5. Specifically, the spring hinge 5 includes a first leaf 51, a second leaf 52, a hinge shaft (not shown in the figure) and a spring piece (not shown in the figure). The first leaf 51 is connected to the shielding body 1, the second leaf 52 is connected to the shielding cover 2, and the first leaf 51 and the second leaf 52 are both rotatably linked to the hinge shaft, and the shielding cover 2 is rotatably connected to the shielding body 1 through the hinge shaft. When the shielding cover 2 is buckled with the shielding body 1, the elastic force of the spring piece makes the shielding cover 2 and the shielding body 1 keep tightly closed, thereby ensuring the electrical continuity between the shielding cover 2 and the shielding body 1 and ensuring the shielding effectiveness of the electromagnetic shielding box 10.

[0040] Please refer to Figure 1 and Figure 3The shielding cover 2 includes a cover plate 21 and a protrusion 22 protruding from one side of the cover plate 21. When the shielding cover 2 is buckled with the shielding body 1, the protrusion 22 is crimped to the elastic member 14. Specifically, the protrusion 22 is crimped to the side of the elastic member 14 away from the side plate 13. In this embodiment, the shielding cover 2 includes four protrusions 22, and the four protrusions 22 protrude from the same side of the cover plate 21. When the shielding cover 2 is buckled with the shielding body 1, each protrusion 22 is correspondingly crimped to an elastic member 14. The protrusion 22 of the shielding cover 2 is designed to cooperate with the elastic member 14 of the shielding body 1 to ensure that the shielding cover 2 is tightly linked to the shielding body 1, forming electrical continuity, thereby ensuring the shielding effectiveness of the electromagnetic shielding box 10.

[0041] See also Figure 1 and Figure 2 The transfer inlet 3 is provided on the shielding body 1, and one end of the transfer inlet 3 is used to connect to one end of the cable under test. The transfer outlet 4 is provided on the shielding body 1, and one end of the transfer outlet 4 is used to connect to the other end of the cable under test. The electromagnetic shielding box 10 is used to construct a local electromagnetic shielding space, which not only eliminates external electromagnetic environment interference but also provides installation space for induced current testing of the cable under test, avoiding the defects of using copper mesh to temporarily bundle the cable under test, such as the inability to quantify and evaluate the shielding effectiveness, the inability to repeat and unify, and the existence of uncontrollable human factors.

[0042] See also Figure 1 and Figure 2 In this embodiment, the shielding body 1 has two transfer inlets 3 on one side panel 13 in the longitudinal direction, and two transfer outlets 4 on the other side panel 13 in the longitudinal direction. In other embodiments, the transfer inlets 3 and transfer outlets 4 can be arranged on two adjacent side panels 13 or on the same side panel 13, depending on actual conditions. The number of transfer inlets 3 and transfer outlets 4 can also be adjusted according to actual conditions, and this application does not limit this.

[0043] See also Figure 1 and Figure 3 The electromagnetic shielding box 10 further includes a manipulation portion 6. The manipulation portion 6 is connected to the side of the shielding cover 2 away from the shielding body 1. In this embodiment, the manipulation portion 6 is a handle, which facilitates the operator to open and close the shielding cover 2 and to carry the electromagnetic shielding box 10.

[0044] Please also refer to Figure 4, an embodiment of the present application also provides a cable testing device. The cable testing device includes: a cable to be tested 20 and an electromagnetic shielding box 10. The cable to be tested 20 is arranged in the shielding body 1 of the electromagnetic shielding box 10, one end of the cable to be tested 20 is connected to the transfer inlet 3 of the electromagnetic shielding box 10, and the other end of the cable to be tested 20 is connected to the transfer outlet 4 of the electromagnetic shielding box 10. In this embodiment, the cable testing device includes two cables to be tested 20, the two ends of one cable to be tested 20 are respectively connected to a transfer inlet 3 and a transfer outlet 4, and the two ends of the other cable to be tested 20 are respectively connected to the other transfer inlet 3 and the other transfer outlet 4.

[0045] See also Figure 1 、 Figure 2 and Figure 4 The cable testing device further includes a test probe 30 and a probe cable 40. The test probe 30 is disposed within the shielding body 1. In this embodiment, the test probe 30 is mounted on the cable under test 20 and is used to monitor the induced current value of the cable under test 20, thereby obtaining the induced current value of the cable under test 20 under an artificially applied electromagnetic environment. One end of the probe cable 40 is connected to the test probe 30, and the other end of the probe cable 40 extends outside the shielding body 1 through the through hole 15 for connection to the test equipment.

[0046] The outer diameter of the end of the probe cable 40 away from the test probe 30 is smaller than the aperture of the through hole 15. In other words, the aperture of the through hole 15 is set to be larger than the outer diameter of the probe cable 40, thereby facilitating the end of the probe cable 40 away from the test probe 30 to pass through the through hole 15.

[0047] See also Figure 1 、 Figure 4 and Figure 5 The cable testing device also includes two sealing members 50. These two sealing members 50 are respectively disposed on either side of the probe cable 40 and are connected to the outer wall of the shielding body 1. Each sealing member 50 is provided with a sealing groove 501. The sealing grooves 501 on the two sealing members 50 combine to form a sealing hole 502, within which the probe cable 40 is embedded. The sealing grooves 501 of the two sealing members 50 combine to form the sealing hole 502, which has an inner diameter less than or equal to the outer diameter of the probe cable 40. This allows the probe cable 40 to be embedded within the sealing hole 502, while the sealing members 50 cover the gap between the probe cable 40 and the through-hole 15, thereby ensuring the electromagnetic shielding performance of the cable testing device.

[0048] See also Figure 1 、 Figure 4 and Figure 6, a slide rail 16 is provided on the side plate 13 of the shielding body 1, and the closing member 50 is slidably connected to the slide rail 16. In this embodiment, two parallel slide rails 16 are provided on the side plate 13 of the shielding body 1, and the two closing members 50 slide into the two ends of the slide rail 16 in the extending direction respectively, so that the closing grooves 501 of the two closing members 50 are combined to form a closing hole 502, and the probe cable 40 is embedded in the closing hole 502.

[0049] Please refer to Figure 1 , Figure 4 and Figure 6 , a positioning hole 17 is further provided on the side plate 13 of the shielding body 1, and a mounting hole 503 is provided on the closing member 50. When the closing grooves 501 of the two closing members 50 are combined to form a closing hole 502 and the probe cable 40 is embedded in the closing hole 502, the positioning hole 17 on the shielding body 1 and the mounting hole 503 on the closing member 50 are correspondingly arranged. In this embodiment, fasteners are passed through the mounting hole 503 and the positioning hole 17 to enhance the connection reliability between the closing member 50 and the shielding body 1, thereby improving the electromagnetic shielding performance of the cable testing device.

[0050] Please refer to Figure 4 , in this embodiment, the cable under test 20 located inside the shielding body 1 includes an unshielded cable. It should be noted that an unshielded cable refers to a cable without an additional shielding layer to protect its internal conductors from electromagnetic interference (EMI) and radio frequency interference (RFI). That is, in the embodiment of the present application, without damaging the configuration state of the cable under test 20, through the transfer inlet 3 and the transfer outlet 4, the shielded cable outside the electromagnetic shielding box 10 can be transferred into an unshielded cable inside the electromagnetic shielding box 10, thereby obtaining the true induced current value inside the unshielded cable. In other embodiments, the cable under test 20 located inside the shielding body 1 can also be set as a shielded cable according to actual needs.

[0051] Please refer to Figure 7 , A refers to the induced current value of the shielded cable obtained by testing the shielded cable without applying the electromagnetic shielding box 10 in the prior art, and B refers to the induced current value of the unshielded cable measured by the test probe 30 after the cable under test 20 inside the shielding body 1 is transferred into an unshielded cable through the transfer inlet 3 and the transfer outlet 4 when the cable under test 20 is placed in the electromagnetic shielding box 10. At the same frequency, the value of B is much smaller than the value of A. It can be seen that the embodiment of the present application can more accurately measure the induced current value of the unshielded cable.

[0052] In the description of the present application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0053] In the above embodiments, the descriptions of the respective embodiments have their own focuses. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments. The embodiments, implementation manners and related technical features of the present application may be combined and replaced with each other without conflict.

[0054] The above are only the preferred embodiments of the present application and do not impose any form of limitation on the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still fall within the scope of the technical solution of the present application.

Claims

1. An electromagnetic shielding box (10), characterized in that, Comprising: A shielding body (1) having an opening, the shielding body (1) being used for accommodating a cable under test (20); A shielding cover (2) rotatably connected to the shielding body (1), the shielding cover (2) being used for covering the opening; At least one transfer inlet (3) provided on the shielding body (1), one end of the transfer inlet (3) being used for connecting one end of the cable under test (20); And At least one transfer outlet (4) provided on the shielding body (1), one end of the transfer outlet (4) being used for connecting the other end of the cable under test (20).

2. The electromagnetic shielding box (10) according to claim 1, wherein The shielding body (1) includes a bottom plate (12) and a plurality of side plates (13) protruding from one side of the bottom plate (12), and at least one side plate (13) is provided with an elastic member (14) at one end away from the bottom plate (12); When the shielding cover (2) is buckled with the shielding body (1), the shielding cover (2) is pressed against the elastic member (14).

3. The electromagnetic shielding box (10) according to claim 2, characterized in that, The shielding cover (2) includes a cover plate (21) and a protruding portion (22) protruding from one side of the cover plate (21). When the shielding cover (2) is buckled with the shielding body (1), the protruding portion (22) is pressed against the elastic member (14).

4. The electromagnetic shielding box (10) according to claim 3, characterized in that, The elastic member (14) is provided on the inner wall of the side plate (13), and the protruding portion (22) is pressed against the side of the elastic member (14) away from the side plate (13).

5. The electromagnetic shielding box (10) according to claim 1, characterized in that, The shielding cover (2) is hinged to the shielding body (1).

6. The electromagnetic shielding box (10) according to claim 5, characterized in that, The electromagnetic shielding box (10) further includes: a spring hinge (5), one end of the spring hinge (5) being connected to the shielding body (1), the other end of the spring hinge (5) being connected to the shielding cover (2), and the shielding cover (2) being hinged to the shielding body (1) through the spring hinge (5).

7. The electromagnetic shielding box (10) according to claim 1, characterized in that, The electromagnetic shielding box (10) further includes: a control part (6) connected to the side of the shielding cover (2) away from the shielding body (1).

8. A cable testing device, characterized in that, Comprising: A cable under test (20) and the electromagnetic shielding box (10) according to any one of claims 1-7, the cable under test (20) being arranged inside the shielding body (1) of the electromagnetic shielding box (10), one end of the cable under test (20) being connected to the transfer inlet (3) of the electromagnetic shielding box (10), and the other end of the cable under test (20) being connected to the transfer outlet (4) of the electromagnetic shielding box (10).

9. The cable testing device according to claim 8, wherein, The shielding body (1) is provided with a through hole (15); The cable testing device further includes: A test probe (30) arranged inside the shielding body (1); And A probe cable (40), one end of which is connected to the test probe (30), and the other end of which passes through the through hole (15) and extends outside the shielding body (1) for connection to a test device.

10. The cable testing device according to claim 9, wherein, The test probe (30) is sleeved on the cable under test (20), and the test probe (30) is used for monitoring the induced current value of the cable under test (20).

11. The cable testing device according to claim 9, wherein, The outer diameter of one end of the probe cable (40) away from the test probe (30) is smaller than the aperture of the through hole (15). The cable testing device further includes: Two closures (50) respectively arranged on both sides of the probe cable (40), both of the two closures (50) are connected to the outer wall of the shielding body (1), and a closed groove (501) is provided on each of the two closures (50). The closed grooves (501) on the two closures (50) form a closed hole (502) in combination, and the probe cable (40) is embedded in the closed hole (502).

12. The cable testing device according to claim 8, characterized in that, The cable under test (20) located in the shielding body (1) includes an unshielded cable.

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