Electromagnetic shielding structure for converter shell

Abstract

The utility model discloses an electromagnetic shielding structure for a current transformer shell, which relates to the technical field of current transformers and comprises a box body and a box door arranged on one side wall of the box body, the outer side wall of the box body is made of aluminum materials, a reflecting layer is arranged in the side wall of the box body, the longitudinal section of the reflecting layer is wavy, and graphite is filled in one side, close to the inside of the box body, of the reflecting layer. A first channel is formed in the bottom end of the side wall, away from the box door, of the box body, a first filter screen is arranged on the side, away from the box door, in the first channel, and a second filter screen is rotationally connected to the side wall, close to the box door, of the first filter screen. According to the utility model, the wave-shaped reflecting layer is arranged in the side wall of the box body, the reflection and refraction paths after electromagnetic waves permeate are increased, so that the intensity of the electromagnetic waves is effectively weakened, the graphite is filled in one side, close to the interior of the box body, of the reflecting layer, and the graphite is used as an excellent electromagnetic wave absorbing material; residual electromagnetic waves can be further absorbed, and it is ensured that electronic equipment in the box body is free of interference.

Description

TECHNICAL FIELD

[0001] The utility model relates to a converter technical field, concretely is a kind of electromagnetic shielding structure for converter shell. BACKGROUND

[0002] Converter is the voltage, frequency, phase number and other electric quantity or characteristic of power supply system change the electric appliance of occurrence, it mainly includes rectifier (AC / DC, AC changes direct current), inverter (direct current changes AC, DC / AC), AC converter (AC / AC converter, AC / AC) and direct current converter (DC chopper, DC Chopper), converter is generally realized by power electronic component, function is to realize the transmission of power.

[0003] The electromagnetic shielding structure for converter shell, its core is to use metal shielding material to close electromagnetic interference source, or to use metal material to close electromagnetic sensitive circuit to reduce electromagnetic interference and realize electromagnetic compatibility, so the sealing property of shell is required higher, but the temperature in the shell under sealed state will gradually increase with the work of electronic component and the influence of external environment, so it is needed to open heat dissipation hole or install heat dissipation fin on the outer wall of shell, but the heat dissipation effect of heat dissipation fin is limited, and the heat dissipation hole is easy to become the position of electromagnetic wave penetration.

[0004] Therefore, the present application is proposed. UTILITY MODEL CONTENT

[0005] The utility model discloses a kind of electromagnetic shielding structure for converter shell, to solve the problem raised in above background technology.

[0006] To solve the above technical problem, the electromagnetic shielding structure for converter shell provided by the utility model, including box and box door being set on the side wall of box, the outer side wall of box is aluminum material, the inside of box side wall is equipped with reflection layer, the longitudinal section of reflection layer is wave-shaped, the side of reflection layer close to the inside of box is filled with graphite, the bottom end of the side wall of box away from box is equipped with passage one, the side of passage one away from box is equipped with filter screen one, the side wall of filter screen one close to box is rotatably connected with filter screen two, the outer arc wall bottom end of filter screen two is gear side, the gear side on filter screen two is mesh-connected with force storage mechanism, the end of force storage mechanism away from filter screen two is fixed with drive mechanism.

[0007] Force storage mechanism includes rack rod meshed with the gear side of filter screen two, rack rod is fixed with slide rod on one side wall along its length direction, drive mechanism includes piston plate fixed to the end of slide rod away from rack rod, the outside of the end of piston plate away from slide rod and slide rod is slidably provided with piston cylinder, piston cylinder is fixed to the inside wall of box, the side of piston cylinder away from force storage mechanism is fixed with capillary tube, the end of capillary tube away from piston cylinder is fixed with sealed capsule, sealed capsule is fixed to the inside wall of box.

[0008] The filter holes of the filter screen one and the filter screen two are arranged alternately, the filter screen one and the filter screen two are of the same structure, the cross section of the filter hole of the filter screen one along the radial direction is V-shaped, the filter screen one and the filter screen two are made of aluminum, and the inner side wall of the box is provided with conductive wires made of iron and grounded.

[0009] Further, a limiting block is fixedly connected to one side of the outer arc wall of the sliding rod close to the rack rod, the longitudinal section of the limiting block along the axial direction of the sliding rod is trapezoidal, and the outer arc wall of the limiting block is arranged to be inclined away from the rack rod, a return spring is fixed to one side wall of the limiting block away from the rack rod, the return spring is sleeved on the outer side of the sliding rod, a first fixing rod is coaxially fixed to one end of the return spring away from the limiting block, the first fixing rod is slidingly sleeved on the outer arc wall of one end of the sliding rod away from the rack rod, a fixed column abuts against the bottom of the limiting block, a groove one is vertically formed in one side wall of the fixed column close to the limiting block, one side wall of the fixed column close to the rack rod and the inner side wall of the groove one close to the rack rod abut against each other, a horizontal sliding channel one is formed in the middle of the outer arc wall of the fixed column, and one end of the sliding channel one away from the rack rod is arranged to be inclined downward, and the length direction of the sliding channel one is parallel to the axial direction of the sliding rod.

[0010] Further, a wedge-shaped block is slidingly arranged in the sliding channel one of the fixed column, a second fixing rod is fixedly connected to one side wall of the wedge-shaped block away from the fixed column, the axial direction of the second fixing rod is parallel to the axial direction of the sliding rod, the same fixed plate is fixed to one end of the sliding rod away from the rack rod and one end of the second fixing rod away from the wedge-shaped block, a piston plate is fixed to the middle of one side wall of the fixed plate away from the sliding rod, a vertical fixed rod three is coaxially and slidingly connected to the bottom of the fixed column, and the fixed rod three is fixed to the inner wall of the bottom of the box.

[0011] Further, the piston cylinder is of a hollow structure, a sliding channel two is horizontally formed in one side wall of the piston cylinder corresponding to the piston plate, the length direction of the sliding channel two is consistent with the length direction of the piston cylinder, the piston plate is slidingly arranged in the sliding channel two, a return compression spring is fixed to one end of one side wall of the piston plate close to the rack rod away from the sliding rod, one end of the return compression spring away from the piston plate is fixed to the inner wall of the piston cylinder, and a sealing plate is slidingly connected to the inner wall of the piston cylinder close to the sliding channel two, the length direction of the sealing plate is consistent with the length direction of the piston cylinder, and the sealing plate is fixed to the piston plate.

[0012] Compared with the prior art, the utility model has the advantages of:

[0013] 1、Through setting the wave-shaped reflection layer inside the side wall of the box, the reflection and refraction paths after the electromagnetic wave penetration are increased, thereby effectively weakening the strength of the electromagnetic wave, the side close to the inside of the box of the reflection layer is filled with graphite, the graphite as an excellent electromagnetic wave absorbing material can further absorb the residual electromagnetic wave, and the electronic equipment inside the box is ensured to be free from interference.

[0014] 2、The filter holes of the filter screen one and the filter screen two are arranged alternately, the penetration of the electromagnetic wave from the filter screen is reduced in the normal state, meanwhile, the filter screen adopts the aluminum material, has good conductivity and heat conductivity, and further enhances the electromagnetic shielding and heat dissipation effect, the conductive wire laid on the inside wall of the box not only enhances the overall electromagnetic shielding performance of the box, but also ensures the effective discharge of the electromagnetic wave through the grounding treatment.

[0015] 3、Through the driving mechanism, the temperature inside the box and on the inner wall can be perceived to drive the force storage mechanism to mesh with the filter screen two to rotate, so that the filter holes of the filter screen one and the filter screen two overlap each other, and the heat dissipation is assisted, and the "V" shape structure of the filter hole reduces the direct penetration of the electromagnetic wave from the filter hole, and has a certain reflection and delay effect on the electromagnetic wave. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a whole structure schematic view of an electromagnetic shielding structure for a converter shell;

[0017] Figure 2 It is a connection relationship schematic view of a filter screen and a driving mechanism and a force storage mechanism in an electromagnetic shielding structure for a converter shell;

[0018] Figure 3 It is a connection relationship schematic view of a driving mechanism and a force storage mechanism in an electromagnetic shielding structure for a converter shell;

[0019] Figure 4 It is a structure schematic view of a force storage mechanism in an electromagnetic shielding structure for a converter shell;

[0020] Figure 5 It is a structure schematic view of a filter screen one and a filter screen two in an electromagnetic shielding structure for a converter shell;

[0021] Figure 6 It is a structure sectional view of a side wall of a box in an electromagnetic shielding structure for a converter shell.

[0022] In the drawing:

[0023] 10, box; 11, box door; 12, filter screen one; 13, filter screen two; 14, reflection layer;

[0024] 20, rack bar; 21, sliding rod; 22, limit block; 23, return spring; 24, fixed column; 25, fixed rod two; 26, wedge block;

[0025] 30, sealed capsule; 31, capillary tube; 32, piston cylinder; 33, piston plate; 34, return spring. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be apparently and completely described in connection with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of protection of the utility model.

[0027] Please refer to the drawings of the embodiments of the utility model Figure 1 to the drawings of the embodiments of the utility model Figure 6 The utility model provides a kind of electromagnetic shielding structure for converter shell: including box 10 and box door 11 being set on the lateral wall of box 10, the lateral wall of box 10 is aluminum material, and the inside of the lateral wall of box 10 is equipped with reflection layer 14, the longitudinal section of reflection layer 14 is wavy, and the side of reflection layer 14 close to the inside of box 10 is filled with graphite, and the bottom end of the lateral wall of box 10 away from box door 11 is equipped with passageway one, the side of passageway one away from box door 11 is equipped with filter screen one 12, and the lateral wall of filter screen one 12 close to box door 11 is rotatably connected with filter screen two 13, the bottom end of the outer arc wall of filter screen two 13 is gear side, and the gear side on filter screen two 13 is meshed and connected with force storage mechanism, and the end of force storage mechanism away from filter screen two 13 is fixed with driving mechanism.

[0028] Force storage mechanism includes rack bar 20 meshed with the gear side of filter screen two 13, and rack bar 20 is fixed with slide rod 21 on one of the lateral walls along its length direction, and driving mechanism includes piston plate 33 fixed to the end of slide rod 21 away from rack bar 20, and the outer side of the end of piston plate 33 away from slide rod 21 and opposite to slide rod 21 is slidably connected with piston cylinder 32, and piston cylinder 32 is fixed to the inside lateral wall of box 10, and the side of piston cylinder 32 away from force storage mechanism is fixed with capillary tube 31, and the end of capillary tube 31 away from piston cylinder 32 is fixed with sealed capsule 30, and sealed capsule 30 is fixed to the inside lateral wall of box 10.

[0029] The filter holes on filter screen one 12 and filter screen two 13 are staggered, filter screen one 12 and filter screen two 13 are the same structure, the filter holes on filter screen one 12 are "V" shaped along its radial section, filter screen one 12 and filter screen two 13 are aluminum material, and conductive wire is laid on the inside lateral wall of box 10, and conductive wire is iron material and is grounded.

[0030] It should be noted that: the outer wall of the box 10 is made of aluminum material, which has good conductivity and electromagnetic shielding performance. The longitudinal section of the reflection layer 14 is wavy, which is arranged inside the side wall of the box 10, can effectively reflect electromagnetic waves, and reduce the possibility of penetrating the box 10. The side of the reflection layer 14 close to the inside of the box 10 is filled with graphite, which is an excellent electromagnetic wave absorbing material, which can further absorb residual electromagnetic waves, and the conductive wire is used to guide the electromagnetic wave conduction to the ground;

[0031] The filter screen one 12 and the filter screen two 13 are arranged in the channel one, the filter holes of the two filter screens are arranged in a staggered manner, the penetration of electromagnetic waves from the filter screen is reduced in the normal state, and the two filter screens are made of aluminum material, which not only has good conductivity and electromagnetic shielding performance, but also can assist heat dissipation when the temperature inside the box 10 is too high;

[0032] The sealed capsule 30 is filled with a heat-sensitive liquid, and the volume of the heat-sensitive liquid will expand after being heated. In a possible embodiment, the liquid filled in the sealed capsule 30 is alcohol or mercury. The sealed capsule 30 is made of a material with good thermal conductivity, the capillary tube 31 is made of a material with poor thermal conductivity, the heat-sensitive liquid in the sealed capsule 30 flows into the piston cylinder 32 through the capillary tube 31 after being heated, and then pushes the piston plate 33 to slide, and then drives the force storage mechanism to rotate the filter screen two 13, so that the filter holes of the filter screen one 12 and the filter screen two 13 coincide, and assist heat dissipation.

[0033] Please refer to the accompanying Figure 1 to the accompanying Figure 6 The utility model provides a technical scheme: the outer arc wall of the slide rod 21 is fixedly connected with the limiting block 22 on one side close to the rack rod 20, the longitudinal section of the limiting block 22 along the axial direction of the slide rod 21 is trapezoidal, and the outer arc wall of the limiting block 22 is inclined and arranged away from the rack rod 20, a return spring 23 is fixed on the side wall of the limiting block 22 away from the rack rod 20, the return spring 23 is sleeved on the outer side of the slide rod 21, and a fixed rod one is coaxially fixed on one end of the return spring 23 away from the limiting block 22, and the fixed rod one is slidably sleeved on the outer arc wall of one end of the slide rod 21 away from the rack rod 20;

[0034] The bottom of the limiting block 22 abuts against the fixed column 24, a groove one is vertically arranged on the side wall of the fixed column 24 close to the limiting block 22, the side wall of the fixed column 24 close to the rack rod 20 abuts against the inner side wall of the groove one close to the rack rod 20, a horizontal sliding channel one is formed in the outer arc wall of the fixed column 24, the sliding channel one is inclined downward away from the rack rod 20, and the length direction of the sliding channel one is parallel to the axial direction of the slide rod 21;

[0035] A wedge-shaped block 26 is slidably arranged in the sliding channel one on the fixed column 24, a fixed rod two 25 is fixedly connected to a side wall of the wedge-shaped block 26 away from the fixed column 24, the fixed rod two 25 is axially parallel to the sliding rod 21, a fixed plate is fixed to an end of the sliding rod 21 away from the rack rod 20 and an end of the fixed rod two 25 away from the wedge-shaped block 26, a piston plate 33 is fixed to a middle part of a side wall of the fixed plate away from the sliding rod 21, and a fixed rod three vertically arranged is coaxially and slidably connected to the bottom of the fixed column 24 and fixed to the inner wall of the bottom of the box body 10.

[0036] It should be noted that when the driving mechanism is triggered, the piston plate 33 pushes the fixed plate, and then synchronously pushes the sliding rod 21 and the fixed rod two 25 to move, when the sliding rod 21 moves, the limiting block 22 abuts against the groove one at the end of the fixed column 24, so that the reset spring 23 is compressed, the fixed rod one slides along the axial direction of the sliding rod 21, the fixed rod two 25 drives the wedge-shaped block 26 to abut against the sliding channel one on the fixed column 24, so as to force the fixed column 24 to slide along the fixed rod three, thereby releasing the limitation on the limiting block 22, the limiting block 22 drives the sliding rod 21 to pop out under the action of the reset spring 23, and then engages the filter screen two 13 to rotate.

[0037] Please refer to the accompanying Figure 1 to the accompanying Figure 6 The utility model provides a technical scheme: the piston cylinder 32 is hollow structure, the piston cylinder 32 is correspondingly opened with sliding channel two on a side wall of piston plate 33, the length direction of sliding channel two is identical with the length direction of piston cylinder 32, and the piston plate 33 slides in sliding channel two, and the reset compression spring 34 is fixed to the inner side wall of the piston cylinder 32 on the end of the side wall of the piston plate 33 away from the sliding rod 21.

[0038] The inner side wall of the piston cylinder 32 close to the sliding channel two is slidably connected with a sealing plate, and the length direction of the sealing plate is consistent with the length direction of the piston cylinder 32.

[0039] It should be noted that the piston cylinder 32 is hollow structure, the length direction of sliding channel two is identical with the length direction of piston cylinder 32, when the piston plate 33 slides in sliding channel two, the reset compression spring 34 can provide necessary restoring force, so that the piston plate 33 can automatically return to the initial position when not subjected to external force.

[0040] With the sliding of the piston plate 33, the sealing plate will also move accordingly, ensuring that the liquid inside the piston cylinder 32 does not leak from the sliding channel two.

[0041] Working principle:

[0042] The outer side wall of the box 10 is made of aluminum material, which has good conductivity and electromagnetic shielding performance. The longitudinal section of the reflection layer 14 is wavy, which is arranged inside the side wall of the box 10, can effectively reflect electromagnetic waves, and reduce the possibility of penetrating the box 10. The side of the reflection layer 14 close to the inside of the box 10 is filled with graphite, which is an excellent electromagnetic wave absorbing material, can further absorb residual electromagnetic waves, and the conductive wire is used to guide the electromagnetic wave conduction to the ground;

[0043] The heat-sensitive liquid in the sealed capsule 30 flows into the piston cylinder 32 through the capillary 31 after being heated, and then pushes the piston plate 33 to slide, and then drives the force storage mechanism to make the filter screen two 13 rotate, so that the filter holes of the filter screen one 12 and the filter screen two 13 coincide, and assist heat dissipation.

Claims

1. An electromagnetic shielding structure for a converter housing, comprising a box body (10) and a box door (11) opened on a side wall of the box body (10), characterized in that: The outer side wall of the box (10) is made of aluminum material, the inner side wall of the box (10) is provided with a reflection layer (14), the longitudinal section of the reflection layer (14) is wave-shaped, the side of the reflection layer (14) close to the inside of the box (10) is filled with graphite, the side of the box (10) away from the box door (11) is provided with a channel one, the side of the channel one away from the box door (11) is provided with a filter screen one (12), the side of the filter screen one (12) close to the box door (11) is rotatably connected with a filter screen two (13), the bottom end of the outer arc wall of the filter screen two (13) is a gear side, the gear side of the filter screen two (13) is meshingly connected with a force storage mechanism, and the end of the force storage mechanism away from the filter screen two (13) is fixedly connected with a driving mechanism. The force storage mechanism comprises a rack rod (20) meshingly connected with the gear side of the filter screen two (13), and the rack rod (20) is fixedly connected with a sliding rod (21) on one side wall in the length direction of the rack rod (20). The driving mechanism comprises a piston plate (33) fixedly connected to the end of the sliding rod (21) away from the rack rod (20), and the outer side of the end of the piston plate (33) away from the sliding rod (21) and opposite to the sliding rod (21) is slidably connected with a piston cylinder (32). The piston cylinder (32) is fixedly connected to the inner side wall of the box (10), and the side of the piston cylinder (32) away from the force storage mechanism is fixedly connected with a capillary tube (31). The end of the capillary tube (31) away from the piston cylinder (32) is fixedly connected with a sealing capsule (30), and the sealing capsule (30) is fixedly connected to the inner side wall of the box (10).

2. An electromagnetic shielding structure for a power converter housing as defined in claim 1, wherein: The outer arc wall of the sliding rod (21) is fixedly connected with a limiting block (22) on the side close to the rack rod (20), the longitudinal section of the limiting block (22) in the axial direction of the sliding rod (21) is trapezoidal, and the outer arc wall of the limiting block (22) is inclined away from the rack rod (20). The side of the limiting block (22) away from the rack rod (20) is fixedly connected with a return spring (23), the return spring (23) is sleeved on the outer side of the sliding rod (21), and the end of the return spring (23) away from the limiting block (22) is coaxially fixedly connected with a fixed rod one. The fixed rod one is slidably sleeved on the outer arc wall of the end of the sliding rod (21) away from the rack rod (20).

3. An electromagnetic shielding structure for a power converter housing as defined in claim 2, wherein: The bottom of the limiting block (22) is abutted with a fixed column (24), a groove one is vertically formed in the side wall of the fixed column (24) close to the limiting block (22), the side wall of the fixed column (24) close to the rack rod (20) and the inner side wall of the groove one close to the rack rod (20) are abutted with each other, a horizontal sliding channel one is formed in the middle of the outer arc wall of the fixed column (24), and the end of the sliding channel one away from the rack rod (20) is downwardly inclined. The length direction of the sliding channel one is parallel to the axial direction of the sliding rod (21).

4. An electromagnetic shielding structure for a power converter housing as defined in claim 3, wherein: A wedge-shaped block (26) is slidably arranged in the sliding channel I on the fixed column (24), a fixed rod II (25) is fixedly connected to the side wall of the wedge-shaped block (26) away from the fixed column (24), the fixed rod II (25) is axially parallel to the sliding rod (21), the same fixed plate is fixed to the end of the sliding rod (21) away from the rack rod (20) and the end of the fixed rod II (25) away from the wedge-shaped block (26), the piston plate (33) is fixed to the middle of the side wall of the fixed plate away from the sliding rod (21), and the fixed column (24) is coaxially and slidably connected with a fixed rod III vertically arranged at the bottom of the box body (10).

5. The electromagnetic shielding structure for a power converter housing according to claim 1, wherein: The piston cylinder (32) is a hollow structure, a sliding channel II is horizontally formed in the side wall of the piston cylinder (32) corresponding to the piston plate (33), the length direction of the sliding channel II is consistent with the length direction of the piston cylinder (32), the piston plate (33) is slidably arranged in the sliding channel II, the reset compression spring (34) is fixed to the inner side wall of the piston cylinder (32) at the end of the side wall of the piston plate (33) away from the sliding rod (21).

6. An electromagnetic shielding structure for a power converter housing as defined in claim 5, wherein: The piston cylinder (32) is a hollow structure, a sliding channel II is horizontally formed in the side wall of the piston cylinder (32) corresponding to the piston plate (33), the length direction of the sliding channel II is consistent with the length direction of the piston cylinder (32), the piston plate (33) is slidably arranged in the sliding channel II, the reset compression spring (34) is fixed to the inner side wall of the piston cylinder (32) at the end of the side wall of the piston plate (33) away from the sliding rod (21).

7. An electromagnetic shielding structure for a power converter housing as defined in claim 1, wherein: The filter holes on the filter screen I (12) and the filter screen II (13) are arranged in a staggered manner, the filter screen I (12) and the filter screen II (13) are the same in structure, the filter holes on the filter screen I (12) are "V"-shaped in the radial cross section, and the filter screen I (12) and the filter screen II (13) are made of aluminum.

8. An electromagnetic shielding structure for a power converter housing as defined in claim 1, wherein: The inner side wall of the box body (10) is provided with conductive wires, the conductive wires are made of iron and are grounded.

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