Magnetic shielding case

Abstract

The utility model discloses a magnetic shielding case, which belongs to the technical field of electromagnetic shielding boxes and comprises a magnetic shielding case body, wiring holes are arranged at the upper end of the side wall of the magnetic shielding case body, a silicon steel plate is arranged on the surface of the magnetic shielding case body, a stainless steel plate is arranged at the bottom end of the silicon steel plate, and a permalloy plate is arranged at the bottom end of the stainless steel plate. A positioning mounting assembly is arranged in the magnetic shielding box main body; according to the utility model, the external part adopts silicon steel with higher saturation magnetic induction intensity to carry out pre-stage shielding, and the middle part adopts stainless steel magnetic insulation materials to carry out magnetic insulation on internal and external magnetic shielding materials, so that the shielding effect of the double-layer magnetic shielding structure is ensured, and the internal layer adopts permalloy with very high magnetic conductivity to carry out post-stage shielding; according to the high-voltage power distribution box, the whole shielding case can be ensured to have excellent shielding performance on an external high-intensity magnetic field, the high-voltage power distribution box can be conveniently and stably positioned and mounted by arranging the positioning and mounting assembly, the use convenience of equipment is improved, and the mounting stability is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of electromagnetic shielding boxes, and in particular relates to a magnetic shielding case. Background Art

[0002] The electromagnetic shielding box is a shielding body of various shapes such as shells, plates, and sleeves made of conductive or magnetic materials. It is a metal body that limits the electromagnetic capacity to a certain spatial range to suppress radiation interference, and processes conduction and radiation to provide an interference-free test environment for the wireless communication equipment under test.

[0003] The existing strong magnetic field shielding products for high-voltage distribution boxes of new energy vehicles do not adopt a composite magnetic field shielding structure, resulting in poor strong magnetic field shielding performance of the equipment. When new energy vehicles are running in the strong magnetic field workshop of electrolytic aluminum, the high-voltage distribution box will be affected by the strong magnetic field and cannot work normally. It is also inconvenient to install the high-voltage distribution box, wasting human resources. Utility Model Content

[0004] In order to solve the problems raised in the above background technology, the utility model provides a magnetic shielding case, which has the characteristics of excellent magnetic shielding efficiency and convenient equipment installation and use.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a magnetic shielding chassis, comprising a magnetic shielding box body, a wiring hole is arranged at the upper end of the side wall of the magnetic shielding box body, a silicon steel plate is arranged on the surface of the magnetic shielding box body, a stainless steel plate is arranged at the bottom end of the silicon steel plate, a Permalloy plate is arranged at the bottom end of the stainless steel plate, and a positioning and mounting assembly is arranged inside the magnetic shielding box body.

[0006] Preferably, the silicon steel plate, stainless steel plate and permalloy plate are installed by bending, laser welding and resistance welding.

[0007] Preferably, the positioning and mounting assembly includes a movable plate, a clamping plate, a support plate, a screw rod, a buffer spring and a connecting rod, wherein a screw rod is arranged inside the main body of the magnetic shielding box, a movable plate is symmetrically arranged on the surface of the screw rod, a connecting rod is arranged inside the movable plate, a buffer spring is sleeved on the surface of the connecting rod, a clamping plate is arranged at one end of the connecting rod, and a support plate is arranged at the bottom end of the movable plate.

[0008] Preferably, a guide rod is provided on a side of the interior of the magnetic shielding box body away from the screw rod and corresponding to the movable plate, and both ends of the screw rod are connected to the inner wall surface of the magnetic shielding box body through bearings.

[0009] Preferably, a rotating block is fixed to one end surface of the screw rod, and the surface of the rotating block is provided with anti-slip grooves.

[0010] Preferably, a damping block is provided on one side surface of the clamping plate close to the movable plate, and a through hole is provided inside the movable plate corresponding to the damping block.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The utility model adopts silicon steel with higher saturation magnetic induction intensity for front-stage shielding on the outside, and adopts stainless steel magnetic insulation material in the middle to magnetically insulate the inner and outer magnetic shielding materials to ensure the shielding effect of the double-layer magnetic shielding structure. The inner layer adopts Permalloy with high magnetic permeability for rear-stage shielding, which can ensure that the entire shielding chassis has excellent shielding performance against external strong magnetic fields.

[0013] 2. The utility model can conveniently and stably position and install the high-voltage distribution box by setting a positioning and installation component, thereby improving the convenience of equipment use and ensuring the stability of installation. When the equipment is in use, the high-voltage distribution box can be buffered and shock-absorbed, thereby improving the safety of equipment use and ensuring its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the structural front view of the utility model;

[0015] Figure 2 It is an inverted diagram of the structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the positioning and installation assembly of the utility model;

[0017] Figure 4 The utility model is a composite material magnetic permeability table.

[0018] In the figure: 1. Wiring hole; 2. Magnetic shielding box body; 3. Silicon steel plate; 4. Stainless steel plate; 5. Permalloy plate; 6. Positioning and mounting assembly; 61. Movable plate; 62. Damping block; 63. Clamping plate; 64. Rotating block; 65. Support plate; 66. Screw rod; 67. Buffer spring; 68. Connecting rod. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] Example 1

[0021] See also Figure 1-4The utility model provides the following technical solutions: a magnetic shielding chassis, including a magnetic shielding box body 2, a wiring hole 1 is arranged at the upper end of the side wall of the magnetic shielding box body 2, a silicon steel plate 3 is arranged on the surface of the magnetic shielding box body 2, a stainless steel plate 4 is arranged at the bottom end of the silicon steel plate 3, a Permalloy plate 5 is arranged at the bottom end of the stainless steel plate 4, and a positioning and mounting component 6 is arranged inside the magnetic shielding box body 2.

[0022] Specifically, the silicon steel plate 3, the stainless steel plate 4 and the permalloy plate 5 are installed by means of bending, laser welding and resistance welding.

[0023] By adopting the above technical solution, it is ensured that the silicon steel plate 3, the stainless steel plate 4 and the Permalloy plate 5 can form a continuous and dense shielding body, which can ensure that the magnetic shielding box body 2 has a higher magnetic field shielding effectiveness.

[0024] When this embodiment is in use: a silicon steel plate 3 with a higher saturation magnetic induction intensity is used externally for front-stage shielding, and a stainless steel plate 4 is used in the middle to magnetically insulate the inner and outer magnetic shielding materials to ensure the shielding effect of the double-layer magnetic shielding structure. The inner layer uses a Permalloy plate 5 with a very high magnetic permeability for rear-stage shielding, which can ensure that the entire magnetic shielding box body 2 has excellent shielding performance against external strong magnetic fields.

[0025] Example 2

[0026] The difference between this embodiment and embodiment 1 is that: specifically, the positioning and installation assembly 6 includes a movable plate 61, a clamping plate 63, a support plate 65, a screw rod 66, a buffer spring 67 and a connecting rod 68, wherein a screw rod 66 is arranged inside the magnetic shielding box body 2, the surface of the screw rod 66 is symmetrically provided with a movable plate 61, a connecting rod 68 is arranged inside the movable plate 61, the surface of the connecting rod 68 is sleeved with a buffer spring 67, one end of the connecting rod 68 is provided with a clamping plate 63, and the bottom end of the movable plate 61 is provided with a support plate 65.

[0027] By adopting the above-mentioned technical solution, when the high-voltage distribution box needs to be installed during the use of the magnetic shielding box main body 2, the rotating block 64 is rotated to drive the screw rod 66 to rotate, so that the two groups of movable plates 61 are separated from each other, and then the high-voltage distribution box is placed inside the magnetic shielding box main body 2, and at the same time, the rotating block 64 is reversed so that the screw rod 66 drives the movable plates 61 closer to each other, and at the same time, the clamping plate 63 abuts against the surface of the high-voltage distribution box to clamp it, and the buffer spring 67 is compressed to improve the clamping effect.

[0028] Specifically, a guide rod is provided on a side of the magnetic shielding box body 2 away from the screw rod 66 corresponding to the movable plate 61 , and both ends of the screw rod 66 are connected to the inner wall surface of the magnetic shielding box body 2 through bearings.

[0029] By adopting the above technical solution, the stability of the movement of the movable plate 61 is ensured and the use quality of the equipment is improved.

[0030] Specifically, a rotating block 64 is fixed to one end surface of the screw rod 66 , and the surface of the rotating block 64 is provided with anti-slip grooves.

[0031] By adopting the above technical solution, the convenience of rotating the screw rod 66 is improved, human resources are saved, and the stability of equipment use is improved.

[0032] Specifically, a damping block 62 is disposed on a surface of one side of the clamping plate 63 close to the movable plate 61 , and a through hole is disposed inside the movable plate 61 corresponding to the damping block 62 .

[0033] By adopting the above technical solution, when vibration occurs, the buffer spring 67 buffers the high-voltage distribution box, and the damping block 62 slides inside the movable plate 61 to process the elastic potential energy, thereby ensuring the stability and safety of the equipment and improving the work quality.

[0034] When this embodiment is in use: when the high-voltage distribution box needs to be installed when the magnetic shielding box main body 2 is in use, the rotating block 64 is rotated to drive the screw rod 66 to rotate, so that the two groups of movable plates 61 are separated from each other, and then the high-voltage distribution box is placed in the interior of the magnetic shielding box main body 2, and at the same time, the rotating block 64 is reversed so that the screw rod 66 drives the movable plates 61 to approach each other, and at the same time, the clamping plate 63 abuts against the surface of the high-voltage distribution box to clamp it, and the buffer spring 67 is compressed to improve the clamping effect. In the event of vibration, the buffer spring 67 buffers the high-voltage distribution box, and the damping block 62 slides inside the movable plate 61 to process the elastic potential energy, thereby ensuring the stability and safety of the equipment and improving the work quality.

[0035] Working principle and use process of the utility model: When the utility model is in use, when the magnetic shielding box body 2 is in use, the silicon steel plate 3, the stainless steel plate 4 and the Permalloy plate 5 are installed by bending, laser welding and resistance welding. The shielding effectiveness of the magnetic shielding box body 2 can be calculated by formula 1:

[0036]

[0037] In the formula, μ r1 , μ r2 ——Relative magnetic permeability of inner and outer shell materials;

[0038] t1, t2——the wall thickness of inner and outer shells;

[0039] R1, R2——equivalent spherical outer radius of the inner and outer shells;

[0040] Substituting the design parameters into the shielding effectiveness calculation formula, the shielding effectiveness can be obtained:

[0041] SE dB =20lg{1+51+32.2}=20lg84.2≈38.5dB;

[0042] When the high-voltage distribution box needs to be installed during the use of the magnetic shielding box main body 2, the rotating block 64 is rotated to drive the screw rod 66 to rotate, so that the two sets of movable plates 61 are separated from each other, and then the high-voltage distribution box is placed inside the magnetic shielding box main body 2, and the rotating block 64 is reversed at the same time so that the screw rod 66 drives the movable plates 61 closer to each other, and at the same time, the clamping plate 63 abuts against the surface of the high-voltage distribution box to clamp it, and the buffer spring 67 is compressed to improve the clamping effect. In the event of vibration, the buffer spring 67 buffers the high-voltage distribution box, and the damping block 62 slides inside the movable plate 61 to process the elastic potential energy, thereby ensuring the stability and safety of the equipment and improving the work quality.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A magnetic shielding chassis, comprising a magnetic shielding box body, characterized in that: The upper end of the side wall of the magnetic shielding box body is provided with a wiring hole, the surface of the magnetic shielding box body is provided with a silicon steel plate, the bottom of the silicon steel plate is provided with a stainless steel plate, the bottom of the stainless steel plate is provided with a Permalloy plate, and a positioning and installation component is provided inside the magnetic shielding box body.

2. A magnetic shielding chassis according to claim 1, characterized in that: The silicon steel plate, the stainless steel plate and the Permalloy plate are installed by means of bending, laser welding and resistance welding.

3. The magnetic shielding chassis according to claim 1, characterized in that: The positioning and installation assembly includes a movable plate, a clamping plate, a support plate, a screw rod, a buffer spring and a connecting rod, wherein a screw rod is arranged inside the main body of the magnetic shielding box, a movable plate is symmetrically arranged on the surface of the screw rod, a connecting rod is arranged inside the movable plate, a buffer spring is sleeved on the surface of the connecting rod, a clamping plate is arranged at one end of the connecting rod, and a support plate is arranged at the bottom end of the movable plate.

4. A magnetic shielding chassis according to claim 3, characterized in that: A guide rod is arranged on a side of the magnetic shielding box body away from the screw rod and corresponding to the movable plate, and two ends of the screw rod are connected to the inner wall surface of the magnetic shielding box body through bearings.

5. The magnetic shielding chassis according to claim 3, characterized in that: A rotating block is fixed on one end surface of the screw rod, and anti-slip grooves are arranged on the surface of the rotating block.

6. The magnetic shielding chassis according to claim 3, characterized in that: A damping block is arranged on one side surface of the clamping plate close to the movable plate, and a through hole is arranged inside the movable plate corresponding to the damping block.

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