Electronic instrument anti-electromagnetic interference assembly for nuclear facility environment monitoring vehicle

Abstract

The invention relates to the technical field of environment monitoring vehicles, and provides an electronic instrument anti-electromagnetic interference assembly for a nuclear facility environment monitoring vehicle, which comprises a monitoring vehicle body, the top of the monitoring vehicle body is fixedly connected with a shielding bin, and the inner side of the shielding bin is fixedly connected with a plurality of permalloy square cylinders. Nitrogen filling cavities are formed between every two adjacent permalloy square cylinders, communicating holes are formed in the two sides of the multiple nitrogen filling cavities correspondingly, the bottom ends of the multiple nitrogen filling cavities are fixedly connected with gas guide pipes communicating with the interiors of the nitrogen filling cavities correspondingly, and the bottoms of the multiple gas guide pipes are fixedly connected with flow dividing pipes. A filtering mechanism for absorbing electromagnetic waves is arranged at the top end of the inner side of the monitoring vehicle body; and an air supply mechanism is arranged at the inlet end of the shunt pipe. Through linkage of triple technologies of composite electromagnetic shielding, dynamic filtering and nitrogen environment control, the interference suppression problem of a nuclear monitoring vehicle in a complex electromagnetic environment and under extreme temperature and humidity is solved, and the data precision and reliability of a gamma detector in a mobile monitoring scene are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of environmental monitoring vehicle technology, and more specifically, to an electromagnetic interference protection component for electronic instruments used in nuclear facility environmental monitoring vehicles. Background Technology

[0002] As a key mobile platform for the environmental radiation monitoring system of nuclear power plants, the nuclear facility environmental monitoring vehicle must ensure the measurement accuracy of precision instruments such as gamma spectrometers in complex electromagnetic environments. However, existing technologies face three major technical bottlenecks: 1. Difficulty in synchronously suppressing vehicle-mounted composite interference sources: The operation of equipment such as vehicle generators and air conditioning compressors generates power frequency (50 / 60Hz) and harmonic magnetic fields (100Hz-10kHz), causing baseline drift of the gamma detector. The GHz-level radio frequency noise generated by the rooftop 4G / 5G antennas and wireless communication equipment (up to 20 sets in Table 5-1) is mismatched with the frequency band of traditional filtering technology. The cross wiring of strong and weak currents causes inverter switching noise (100kHz-10MHz) to be coupled to sensitive equipment through the power line. 2. Installation contradictions of roof-mounted detectors: Gamma detectors need to protrude from the roof and be unobstructed on all sides to ensure the monitoring field of view. Roof-mounted equipment is directly exposed to external electromagnetic fields, and traditional metal shielding covers will block the detector and increase the load. 3. Environmental adaptability defects: Moisture in the air ionizes under high voltage (≥3kV for the high voltage module of the gamma spectrometer), resulting in corona discharge. The thermal expansion and contraction of the metal shielding body at -40℃ to 60℃ can easily disrupt the electromagnetic continuity.

[0003] In view of this, the present invention proposes an electromagnetic interference protection component for vehicle-mounted electronic instruments used for nuclear facility environmental monitoring. Summary of the Invention

[0004] This invention proposes an electromagnetic interference protection component for vehicle-mounted electronic instruments used for nuclear facility environmental monitoring, which solves the problem of difficulty in synchronously suppressing multiple interference sources on vehicles in the prior art.

[0005] The technical solution of the present invention is as follows: An electromagnetic interference protection component for an electronic instrument used in a nuclear facility environmental monitoring vehicle includes a monitoring vehicle body. A shielding chamber is fixedly connected to the top of the monitoring vehicle body. A plurality of permalloy square tubes are fixedly connected to the inner side of the shielding chamber. The plurality of permalloy square tubes are equidistantly distributed along the length direction of the permalloy square tubes. A nitrogen filling cavity is provided between two adjacent permalloy square tubes. A connecting hole is provided on both sides of the plurality of nitrogen filling cavities. A gas guide pipe communicating with the inside of the nitrogen filling cavity is fixedly connected to the bottom of the plurality of nitrogen filling cavities. A diversion pipe is fixedly connected to the bottom of the plurality of gas guide pipes. A filter mechanism for absorbing electromagnetic waves is provided at the top of the inner side of the monitoring vehicle body. A gas supply mechanism for introducing nitrogen into the diversion pipe by cooperating with the activation of the filter mechanism is provided at the inlet end of the diversion pipe.

[0006] Preferably, the shielding chamber includes an aluminum-magnesium alloy layer, and a galvanized cold-rolled steel layer is fixedly connected to the outside of the aluminum-magnesium alloy layer.

[0007] Preferably, the filtering mechanism includes a fixed frame fixedly connected to the inside of the monitoring vehicle body, a motor fixedly mounted at one end of the fixed frame, a reciprocating lead screw fixedly connected to the output shaft of the motor, a movable seat threadedly connected to the reciprocating lead screw, a guide rod fixedly connected to the inside of the monitoring vehicle body, the guide rod passing through one end of the movable seat and slidably connected to the movable seat, and an EMI filter fixedly connected to the top of the movable seat.

[0008] Preferably, the guide rod is arranged parallel to the reciprocating lead screw and has the same length as the reciprocating lead screw.

[0009] Preferably, the gas supply mechanism includes a gas cylinder fixedly connected to the inner wall of the monitoring vehicle body, a piston slidably connected to the inner side of the gas cylinder, an air inlet pipe fixedly connected to the inlet end of the gas cylinder, a nitrogen storage tank fixedly connected to the air inlet pipe, the nitrogen storage tank fixedly connected to the inner side of the monitoring vehicle body, an air outlet pipe fixedly connected to the outlet end of the gas cylinder, the air outlet pipe communicating with the inside of the diverter pipe, and a linkage component provided at the top of the gas cylinder to drive the piston to slide up and down reciprocally by cooperating with the start of the motor.

[0010] Preferably, an intake check valve is fixedly connected to the inlet end of the intake pipe, and an outlet check valve is fixedly connected to the outlet end of the outlet pipe.

[0011] Preferably, the linkage includes a push-pull rod penetrating the top wall of the air cylinder, the bottom end of the push-pull rod being fixedly connected to the piston, the top end of the push-pull rod being fixedly connected to a mounting base, a pressure roller being rotatably connected to the inner side of the mounting base, and a cam being fixedly connected to the output shaft of the motor, the cam intermittently contacting the pressure roller by rotating.

[0012] Preferably, the linkage further includes a return spring sleeved on the push-pull rod, the top end of the return spring abutting against the mounting base, and the bottom end of the return spring abutting against the top end of the air cylinder.

[0013] Preferably, a gamma detector is fixedly connected to the top of the shielding chamber, and a protective railing is fixedly connected to the outer edge of the shielding chamber.

[0014] The working principle and beneficial effects of this invention are as follows: 1. The permalloy square tube forms a magnetic short-circuit path, converting the low-frequency magnetic field (50Hz-10kHz) generated by the vehicle's generator / air conditioner into eddy current heat dissipation, thus solving the problem of gamma spectrum baseline drift; the galvanized cold-rolled steel layer absorbs the low-frequency magnetic field, and the aluminum-magnesium alloy layer reflects GHz-level high-frequency interference such as 4G / 5G, achieving full-band coverage suppression of strong and weak electrical interference. 2. By driving the motor to reciprocate, the filtering range is expanded, and the switching noise of the inverter (100kHz-10MHz) and cross-interference of 20 sets of communication equipment are suppressed simultaneously.

[0015] 3. The shielding chamber adopts a hollow frame structure, with the gamma detector protruding from the top of the chamber, which not only meets the requirement of 360° unobstructed monitoring, but also achieves strong local shielding through the distributed layout of permalloy square tubes.

[0016] 4. The nitrogen-filled cavity forms a closed gas path through the connecting hole, replacing the humid air, eliminating the risk of ionization of the high-voltage module under a temperature difference of -40℃ to 60℃, and ensuring the stability of insulation strength. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic diagram of the electromagnetic interference protection component for a vehicle-mounted electronic instrument used for nuclear facility environmental monitoring, according to the present invention. Figure 2 This is a partial structural diagram of the present invention; Figure 3 This is a schematic diagram of the internal structure of the shielding chamber of the present invention; Figure 4 This is a schematic diagram of the shielding chamber of the present invention; Figure 5 This is a schematic diagram of the filtering mechanism of the present invention; Figure 6 This is a schematic diagram of the gas supply mechanism of the present invention; Figure 7 This is a schematic diagram of the linkage component of the present invention.

[0019] In the diagram: 1. Monitoring vehicle body; 2. Shielding compartment; 201. Galvanized cold-rolled steel layer; 202. Aluminum-magnesium alloy layer; 21. Permalloy square tube; 22. Nitrogen filling chamber; 23. Air guide pipe; 24. Diverter pipe; 25. Connecting hole; 3. Guardrail; 4. Gamma detector; 5. Filtering mechanism; 51. Fixing frame; 52. Motor; 53. Reciprocating screw; 54. Movable seat; 55. Guide rod; 56. EMI filter; 6. Air supply mechanism; 61. Air cylinder; 62. Piston; 63. Inlet pipe; 64. Outlet pipe; 65. Nitrogen storage tank; 66. Inlet check valve; 67. Outlet check valve; 68. Linkage component; 681. Push-pull rod; 682. Mounting seat; 683. Pressure roller; 684. Cam; 685. Return spring. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figures 1-7 As shown, this embodiment proposes an electromagnetic interference protection component for electronic instruments used in nuclear facility environmental monitoring vehicles. It includes a monitoring vehicle body 1, a shielding chamber 2 fixedly connected to the top of the monitoring vehicle body 1, a gamma detector 4 fixedly connected to the top of the shielding chamber 2, and a protective railing 3 fixedly connected to the outer edge of the shielding chamber 2. Several permalloy square tubes 21 are fixedly connected to the inner side of the shielding chamber 2, and these tubes are equidistantly distributed along their length. A nitrogen-filled cavity 22 is provided between two adjacent permalloy square tubes 21. A connecting hole 25 is provided on both sides of each nitrogen-filled cavity 22. A gas guide pipe 23 communicating with the interior of each nitrogen-filled cavity 22 is fixedly connected to the bottom of each nitrogen-filled cavity 22. A diversion pipe 24 is fixedly connected to the bottom of each gas guide pipe 23. A filter mechanism 5 for absorbing electromagnetic waves is provided at the top of the inner side of the monitoring vehicle body 1. A gas supply mechanism 6, which introduces nitrogen into the diversion pipe 24 in conjunction with the activation of the filter mechanism 5, is provided at the inlet end of the diversion pipe 24.

[0022] The permalloy square tube 21 can form a magnetic short-circuit path, converting low-frequency magnetic field energy into eddy current heat dissipation, solving the interference of power frequency (50 / 60Hz) and harmonic magnetic fields generated by vehicle motors or generators, and avoiding baseline drift of the gamma spectrum; the nitrogen-filled cavity 22 can eliminate dielectric loss caused by air humidity, with a stable molecular structure that does not ionize, maintaining constant insulation strength, ensuring that the high-voltage module of the detector does not generate corona discharge, and improving measurement stability.

[0023] Furthermore, the shielding chamber 2 includes an aluminum-magnesium alloy layer 202, and a galvanized cold-rolled steel layer 201 is fixedly connected to the outside of the aluminum-magnesium alloy layer 202.

[0024] The galvanized cold-rolled steel layer 201 can absorb low-frequency magnetic fields to solve the interference of vehicle power system, and the aluminum-magnesium alloy layer 202 can reflect high-frequency electromagnetic fields to suppress 4G / 5G communication interference. In this way, the full-band coverage eliminates the electromagnetic influence on the detection of γ detector 4.

[0025] Furthermore, the filtering mechanism 5 includes a fixed frame 51 fixedly connected to the inside of the monitoring vehicle body 1. A motor 52 is fixedly installed at one end of the fixed frame 51. A reciprocating screw 53 is fixedly connected to the output shaft of the motor 52. A movable seat 54 is threadedly connected to the reciprocating screw 53. A guide rod 55 is fixedly connected to the inside of the monitoring vehicle body 1. The guide rod 55 passes through one end of the movable seat 54 and is slidably connected to the movable seat 54. An EMI filter 56 is fixedly connected to the top of the movable seat 54. The guide rod 55 is parallel to the reciprocating screw 53 and has the same length as the reciprocating screw 53.

[0026] The EMI filter 56 can suppress electromagnetic interference in multiple frequency bands, including generator ripple, inverter switching noise, 4G / 5G high-frequency interference, and electrostatic discharge. This ensures that all electrical equipment will not interfere with the gamma detector 4 when it starts up, thereby improving the accuracy of monitoring. By starting the motor 52 to drive the reciprocating screw 53 to rotate, the movable seat 54 moves back and forth along the axis of the reciprocating screw 53, so that the EMI filter 56 performs dynamic filtering in different areas of the monitoring vehicle body 1. This can greatly improve the filtering range of the EMI filter 56 and further enhance the anti-electromagnetic interference capability of the γ detector 4.

[0027] Furthermore, the gas supply mechanism 6 includes a gas cylinder 61 fixedly connected to the inner wall of the monitoring vehicle body 1. A piston 62 is slidably connected to the inner side of the gas cylinder 61. An air inlet pipe 63 is fixedly connected to the inlet end of the gas cylinder 61. A nitrogen storage tank 65 is fixedly connected to the air inlet pipe 63. The nitrogen storage tank 65 is fixedly connected to the inner side of the monitoring vehicle body 1. An air outlet pipe 64 is fixedly connected to the outlet end of the gas cylinder 61. The air outlet pipe 64 is connected to the inside of the diverter pipe 24. An air inlet check valve 66 is fixedly connected to the inlet end of the air inlet pipe 63. An air outlet check valve 67 is fixedly connected to the outlet end of the air outlet pipe 64. A linkage 68 is provided at the top of the gas cylinder 61, which drives the piston 62 to slide up and down reciprocally when the motor 52 is started.

[0028] By starting the motor 52, the linkage 68 drives the piston 62 to slide up and down repeatedly, causing the pressure inside the gas cylinder 61 to increase and decrease intermittently. When the pressure inside the gas cylinder 61 decreases, the inlet pipe 63 introduces nitrogen from the nitrogen storage tank 65 into the gas cylinder 61. When the pressure inside the gas cylinder 61 increases, the outlet pipe 64 introduces nitrogen from the gas cylinder 61 into the diverter pipe 24, and then through each gas guide pipe 23 into the corresponding nitrogen filling chamber 22, making the nitrogen filling chamber 22 close to a vacuum state. This can eliminate the dielectric loss caused by air humidity, ensure that the molecular structure is stable and does not ionize, maintain constant insulation strength, ensure that the high voltage module of the detector does not generate corona discharge, and improve measurement stability.

[0029] Furthermore, the linkage 68 includes a push-pull rod 681 that penetrates the top wall of the air cylinder 61. The bottom end of the push-pull rod 681 is fixedly connected to the piston 62, and the top end of the push-pull rod 681 is fixedly connected to a mounting base 682. A pressure roller 683 is rotatably connected to the inner side of the mounting base 682. A cam 684 is fixedly connected to the output shaft of the motor 52. The cam 684 intermittently contacts the pressure roller 683 by rotating. A return spring 685 is sleeved on the push-pull rod 681. The top end of the return spring 685 contacts the mounting base 682, and the bottom end of the return spring 685 contacts the top end of the air cylinder 61.

[0030] Working principle: The EMI filter 56 can suppress multi-band electromagnetic interference, including generator ripple, inverter switching noise, 4G / 5G high-frequency interference, and electrostatic discharge. This ensures that all electrical equipment will not interfere with the gamma detector 4 when it starts up, thereby improving the accuracy of monitoring. The starting motor 52 drives the reciprocating screw 53 to rotate, causing the movable seat 54 to move back and forth along the axis of the reciprocating screw 53. This allows the EMI filter 56 to perform dynamic filtering in different areas within the monitoring vehicle 1, which can greatly improve the filtering range of the EMI filter 56 and further enhance the anti-electromagnetic interference capability of the gamma detector 4. When motor 52 starts, cam 684 rotates synchronously. When cam 684 contacts pressure roller 683, pressure roller 683 moves downward under pressure, causing mounting base 682 to drive push-pull rod 681 downward. At this time, return spring 685 is compressed and accumulates potential energy. When cam 684 disengages from pressure roller 683, return spring 685 releases potential energy, causing push-pull rod 681 to move in the opposite direction. This cycle repeats, and push-pull rod 681 moves up and down, causing piston 62 to slide up and down, causing the pressure inside cylinder 61 to increase and decrease intermittently. When the pressure inside cylinder 61 decreases, the inlet pipe 63 introduces nitrogen from nitrogen storage tank 65 into cylinder 61. When the pressure inside cylinder 61 increases, the outlet pipe 64 introduces nitrogen from cylinder 61 into distributor pipe 24, and then through each gas guide pipe 23 into the corresponding nitrogen filling chamber 22, making the nitrogen filling chamber 22 close to a vacuum state. This can eliminate dielectric loss caused by air humidity, ensure a stable molecular structure without ionization, maintain constant insulation strength, prevent corona discharge from the detector's high-voltage module, and improve measurement stability.

[0031] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An electromagnetic interference protection component for electronic instruments used in a nuclear facility environmental monitoring vehicle, comprising a monitoring vehicle body (1), characterized in that, The top of the monitoring vehicle body (1) is fixedly connected to a shielding chamber (2), and a number of permalloy square tubes (21) are fixedly connected to the inner side of the shielding chamber (2). The number of permalloy square tubes (21) are equidistantly distributed along the length direction of the permalloy square tubes (21). A nitrogen filling chamber (22) is provided between two adjacent permalloy square tubes (21). A connecting hole (25) is provided on both sides of the number of nitrogen filling chambers (22). A gas guide pipe (23) communicating with the inside of the nitrogen filling chamber (22) is fixedly connected to the bottom of the number of nitrogen filling chambers (22). A diversion pipe (24) is fixedly connected to the bottom of the number of gas guide pipes (23). A filter mechanism (5) for absorbing electromagnetic waves is provided at the top of the inner side of the monitoring vehicle body (1). A gas supply mechanism (6) for introducing nitrogen into the diversion pipe (24) by cooperating with the start of the filter mechanism (5) is provided at the inlet end of the diversion pipe (24).

2. The electromagnetic interference protection component for vehicle-mounted electronic instruments used in nuclear facility environmental monitoring according to claim 1, characterized in that, The shielding chamber (2) includes an aluminum-magnesium alloy layer (202), and a galvanized cold-rolled steel layer (201) is fixedly connected to the outside of the aluminum-magnesium alloy layer (202).

3. The electromagnetic interference protection component for vehicle-mounted electronic instruments used in nuclear facility environmental monitoring according to claim 1, characterized in that, The filtering mechanism (5) includes a fixed frame (51) fixedly connected to the inside of the monitoring vehicle body (1). A motor (52) is fixedly installed at one end of the fixed frame (51). A reciprocating screw (53) is fixedly connected to the output shaft of the motor (52). A movable seat (54) is threaded onto the reciprocating screw (53). A guide rod (55) is fixedly connected to the inside of the monitoring vehicle body (1). The guide rod (55) passes through one end of the movable seat (54) and is slidably connected to the movable seat (54). An EMI filter (56) is fixedly connected to the top of the movable seat (54).

4. The electromagnetic interference protection component for vehicle-mounted electronic instruments used in nuclear facility environmental monitoring according to claim 3, characterized in that, The guide rod (55) is arranged parallel to the reciprocating lead screw (53) and has the same length as the reciprocating lead screw (53).

5. The electromagnetic interference protection component for vehicle-mounted electronic instruments used in nuclear facility environmental monitoring according to claim 3, characterized in that, The gas supply mechanism (6) includes a gas cylinder (61) fixedly connected to the inner wall of the monitoring vehicle body (1). A piston (62) is slidably connected to the inner side of the gas cylinder (61). An air inlet pipe (63) is fixedly connected to the inlet end of the gas cylinder (61). A nitrogen storage tank (65) is fixedly connected to the air inlet pipe (63). The nitrogen storage tank (65) is fixedly connected to the inner side of the monitoring vehicle body (1). An air outlet pipe (64) is fixedly connected to the outlet end of the gas cylinder (61). The air outlet pipe (64) is connected to the inside of the diverter pipe (24). A linkage (68) is provided at the top of the gas cylinder (61) to drive the piston (62) to slide up and down repeatedly by cooperating with the start of the motor (52).

6. The electromagnetic interference protection component for vehicle-mounted electronic instruments used in nuclear facility environmental monitoring according to claim 5, characterized in that, An intake check valve (66) is fixedly connected to the inlet end of the intake pipe (63), and an outlet check valve (67) is fixedly connected to the outlet end of the outlet pipe (64).

7. The electromagnetic interference protection component for vehicle-mounted electronic instruments used in nuclear facility environmental monitoring according to claim 6, characterized in that, The linkage (68) includes a push-pull rod (681) that penetrates the top wall of the air cylinder (61). The bottom end of the push-pull rod (681) is fixedly connected to the piston (62). The top end of the push-pull rod (681) is fixedly connected to a mounting base (682). A pressure roller (683) is rotatably connected to the inner side of the mounting base (682). A cam (684) is fixedly connected to the output shaft of the motor (52). The cam (684) intermittently contacts the pressure roller (683) by rotating.

8. The electromagnetic interference protection component for vehicle-mounted electronic instruments used in nuclear facility environmental monitoring according to claim 7, characterized in that, The linkage (68) also includes a return spring (685) sleeved on the push-pull rod (681), the top end of the return spring (685) abutting against the mounting base (682), and the bottom end of the return spring (685) abutting against the top end of the air cylinder (61).

9. The electromagnetic interference protection component for vehicle-mounted electronic instruments used in nuclear facility environmental monitoring according to claim 1, characterized in that, A gamma detector (4) is fixedly connected to the top of the shielding chamber (2), and a protective railing (3) is fixedly connected to the outer edge of the shielding chamber (2).

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