Nuclear power station video stream one-way transmission device and system

Abstract

The utility model relates to a nuclear power station video stream one-way transmission device and system. The device comprises a transmitting end device, a one-way laser communication device and a receiving end device. The transmitting end device comprises a first communication circuit used for being connected with the camera device to obtain video stream data, a first processing circuit connected with the first communication circuit, a first power supply circuit connected with the first communication circuit and the first processing circuit, and a first protection circuit connected with the first power supply circuit; the one-way laser communication device comprises a laser transmitting end and a laser receiving end which are connected with a first processing circuit; the receiving end device comprises a second processing circuit connected with the laser receiving end, a second communication circuit connected with the second processing circuit, a second power supply circuit connected with the second communication circuit and the second processing circuit, and a second protection circuit connected with the second power supply circuit. According to the utility model, the effect of transmitting video stream data without physical connection is realized by using the laser communication device, and the safety, reliability and efficiency of data transmission are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power plant equipment, in particular to a unidirectional transmission device and system for nuclear power plant video streams. Background Art

[0002] In a nuclear power plant, although it is easy to achieve data transmission through physical connection, the physical connection is vulnerable to electromagnetic interference, which may cause data distortion. Moreover, the physical connection is usually a two-way transmission, and any load failure on the data transmission line may affect data integrity, so there are certain security risks. To ensure safety, some important data in nuclear power plants are generally transmitted without physical connection. Taking video stream data as an example, although the current nuclear power plant realizes the purpose of transmitting data without physical connection by transferring the memory through a robotic arm, this transmission method has the defect of low transmission efficiency. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a unidirectional transmission device and system for nuclear power plant video streams.

[0004] The technical solution adopted by the utility model to solve its technical problem is to construct a unidirectional transmission device for nuclear power plant video streams, including a transmitting end device, a unidirectional laser communication device, and a receiving end device;

[0005] The transmitting end device includes:

[0006] A first communication circuit for electrically connecting a camera device to obtain video stream data;

[0007] A first processing circuit electrically connected to the first communication circuit to receive the video stream data and output processed data;

[0008] A first power supply circuit electrically connected to the first communication circuit and the first processing circuit for supplying power to the first communication circuit and the first processing circuit; and

[0009] A first protection circuit electrically connected to the first power supply circuit for alarming when a power supply failure occurs in the first power supply circuit;

[0010] The unidirectional laser communication device includes:

[0011] A laser transmitting end electrically connected to the first processing circuit for receiving the processed data and outputting a laser signal;

[0012] A laser receiving end disposed opposite to the laser transmitting end for receiving the laser signal and outputting data to be restored;

[0013] The receiving end device includes:

[0014] A second processing circuit electrically connected to the laser receiving end for receiving the data to be restored and outputting the restored video stream data;

[0015] A second communication circuit electrically connected to the second processing circuit for outputting the restored video stream data to a video display device;

[0016] A second power supply circuit electrically connected to the second communication circuit and the second processing circuit for supplying power to the second communication circuit and the second processing circuit; and

[0017] A second protection circuit electrically connected to the second power supply circuit for alarming when a power supply failure occurs in the second power supply circuit.

[0018] Preferably, the first communication circuit includes:

[0019] A first USB-to-Ethernet adapter unit for electrically connecting to the imaging device to obtain the video stream data; and

[0020] A first network processing unit electrically connected to the first USB-to-Ethernet adapter unit and the first processing circuit;

[0021] The second communication circuit includes:

[0022] A second network processing unit electrically connected to the second processing circuit;

[0023] A second USB-to-Ethernet adapter unit electrically connected to the second network interface unit and the video display device.

[0024] Preferably, the transmitting end device further includes a first indicator unit electrically connected to the first network processing unit, the first power supply circuit, and the first protection circuit;

[0025] The receiving end device further includes a second indicator unit electrically connected to the second network processing unit, the second power supply circuit, and the second protection circuit.

[0026] Preferably, the first indicator unit and the second indicator unit respectively include:

[0027] A power indicator electrically connected to the first power supply circuit or the second power supply circuit for indicating whether the power supply circuit it is connected to is supplying power;

[0028] A status indicator electrically connected to the first protection circuit or the second protection circuit for indicating whether the power supply circuit it is connected to is faulty; and

[0029] An operating indicator electrically connected to the first network processing unit or the second network processing unit for indicating whether the network processing unit it is connected to is transmitting data.

[0030] Preferably, the first protection circuit includes:

[0031] A first voltage detection unit electrically connected to the first power supply circuit for detecting the output voltage of the first power supply circuit;

[0032] A first current detection unit electrically connected to the first power supply circuit for detecting the output current of the first power supply circuit;

[0033] A first buzzer for outputting an alarm voice when the output voltage of the first power supply circuit is overvoltage or the output current of the first power supply circuit is overcurrent;

[0034] A first protection controller electrically connected to the first voltage detection unit, the first current detection unit and the first buzzer; and

[0035] A first button electrically connected to the first protection controller;

[0036] The second protection circuit includes:

[0037] A second voltage detection unit electrically connected to the second power supply circuit for detecting the output voltage of the second power supply circuit;

[0038] A second current detection unit electrically connected to the second power supply circuit for detecting the output current of the second power supply circuit;

[0039] A second buzzer for outputting an alarm voice when the output voltage of the second power supply circuit is overvoltage or the output current of the second power supply circuit is overcurrent;

[0040] A second protection controller electrically connected to the second voltage detection unit, the second current detection unit and the second buzzer; and

[0041] A second button electrically connected to the second protection controller.

[0042] Preferably, the transmitting end device further includes a first housing for accommodating the first processing circuit, the first power supply circuit and the first protection circuit;

[0043] The receiving end device further includes a second housing for accommodating the second processing circuit, the second power supply circuit and the second protection circuit.

[0044] Preferably, the transmitting end device further includes a first heat dissipation circuit provided on the first housing and electrically connected to the first power supply circuit;

[0045] The receiving end device further includes a second heat dissipation circuit provided on the second housing and electrically connected to the second power supply circuit.

[0046] Preferably, the first heat dissipation circuit and the second heat dissipation circuit each include a fan disposed on the first housing or the second housing.

[0047] Preferably, the transmitting end device further includes a first control switch electrically connected to the first power supply circuit;

[0048] The receiving end device further includes a second control switch of the second power supply circuit.

[0049] The present utility model also constructs a nuclear power plant video stream unidirectional transmission system, including a camera device, a video display device, and the nuclear power plant video stream unidirectional transmission device described above.

[0050] Implementing the present utility model has the following beneficial effects: providing a nuclear power plant video stream unidirectional transmission device, which uses a unidirectional laser communication device to achieve the effect of unidirectionally transmitting the video stream data output by the camera device to the video display device in a physically unconnected manner, improving the security, reliability, and efficiency of video stream data transmission, and playing a positive role in improving the safety of nuclear power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The following will further illustrate the present utility model in conjunction with the drawings. In the drawings:

[0052] Figure 1 is a circuit structure block diagram of the nuclear power plant video stream unidirectional transmission in some embodiments of the present utility model;

[0053] Figure 2 is a circuit structure block diagram of the first communication circuit and the second communication circuit in some embodiments of the present utility model;

[0054] Figure 3 is a circuit structure block diagram of the first protection circuit and the second protection circuit in some embodiments of the present utility model;

[0055] Figure 4 is a circuit structure block diagram of the first indicator circuit and the second indicator circuit in some embodiments of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0056] In order to have a clearer understanding of the technical features, objectives, and effects of the present utility model, the specific embodiments of the present utility model will now be described in detail with reference to the drawings.

[0057] In the following description, it should be understood that the orientation or positional relationship indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings and is constructed and operated in a specific orientation. This is only for the convenience of describing the technical solution and does not indicate that the indicated device or element must have a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0058] The present utility model provides a unidirectional transmission device for nuclear power plant video streams. Through laser communication technology, the transmission device enables video stream data to be transmitted without physical connection, and has high transmission efficiency and high stability. Figure 1 As shown, the unidirectional transmission device for nuclear power plant video streams includes a transmitting end device 1, a unidirectional laser communication device 2, and a receiving end device 3.

[0059] Please refer to Figure 1 , the transmitting end device 1 may include a first communication circuit 11, a first processing circuit 12, a first power supply circuit 13, and a first protection circuit 14.

[0060] The first communication circuit 11 is used to electrically connect to a camera device to obtain video stream data. The camera device is usually a camera or a video camera, which is used to capture the on-site conditions of the nuclear power plant and output video stream data.

[0061] Further, in some embodiments, as Figure 2 shown, the first communication circuit 11 includes a first USB-to-Ethernet port unit 111 and a first network processing unit 112. The first USB-to-Ethernet port unit 111 is used to electrically connect to the camera device to obtain video stream data. The first network processing unit 112 is electrically connected to the first USB-to-Ethernet port unit 111 and the first processing circuit 12 to obtain video stream data from the first USB-to-Ethernet port unit 111 through a local area network and send the video stream data to the first processing circuit 12.

[0062] Since rewiring in a nuclear power plant requires a large amount of man-hours and costs, a local area network communication network has been arranged in the nuclear power plant. And generally, existing camera devices are configured with USB interfaces. Understandably, in this embodiment, the first USB-to-Ethernet port unit 111 is used to achieve interface conversion, so that the camera device can be communicatively connected to the nearest network port on-site through the first USB-to-Ethernet port unit 111, and then send video stream data to the local area network. Then, the first network processing unit 112 can obtain the video stream data from the local area network and transmit the video stream data to the first processing circuit 12. In this way, the inherent local area network of the nuclear power plant is fully utilized, the on-site wiring process can be omitted as much as possible, which helps to reduce costs. In addition, the first USB-to-Ethernet port unit 111 can be an existing USB-to-Ethernet port circuit or module, and the first network processing unit 112 can be an existing router.

[0063] Please refer to Figure 1 and Figure 2 , the first processing circuit 12 is connected to the first network processing unit 112 included in the first communication circuit 11 to receive video stream data and output processed data. Specifically, the first processing circuit 12 can include a first processor and an existing network communication circuit (i.e., network card); among them, the first processor can be an existing microprocessor (MCU) or single-chip microcomputer, such as a processor with the model number 4003A4000 produced by Loongson Technology Corporation Limited. Its main function is to perform data processing on the video stream data (such as using existing algorithms to achieve data compression, etc., to output processed data. Performing data processing can effectively reduce the amount of data transmitted by the single-way laser communication device 2, which helps to improve the transmission efficiency, and send the processed data to the laser emission end 21 of the single-way laser communication device 2; the role of the network communication circuit included in the first processing circuit 12 is to enable the first processor to establish a communication channel with the first network processing unit 112.

[0064] Please refer to Figure 1 , the first power supply circuit 13 is electrically connected to the first communication circuit 11 and the first processing circuit 12 to supply power to the first communication circuit 11 and the first processing circuit 12. Specifically, the first power supply circuit 13 can be an existing switching power supply circuit or module, such as a power supply module with the model number GW-RC2350-2V.

[0065] Please refer to Figure 1 , the first protection circuit 14 is electrically connected to the first power supply circuit 13 to alarm when a power supply failure occurs in the first power supply circuit 13.

[0066] Further, in some embodiments, such as Figure 3As shown, the first protection circuit 14 includes a first voltage detection unit 141, a first current detection unit 142, a first buzzer 143, a first protection controller 144, and a first button 145. The first voltage detection unit 141 is electrically connected to the first power supply circuit 13 to detect the output voltage of the first power supply circuit 13. The first current detection unit 142 is electrically connected to the first power supply circuit 13 to detect the output current of the first power supply circuit 13. The first buzzer is used to output an alarm voice when the output voltage of the first power supply circuit 13 is greater than the first set voltage or the output current of the first power supply circuit 13 is greater than the second set current. The first protection controller 144 is electrically connected to the first voltage detection unit 141, the first current detection unit 142, and the first buzzer 143 to obtain the output voltage and output current of the first power supply circuit 13. When the output voltage of the first power supply circuit 13 is greater than the first set voltage, the first protection controller 144 determines that the first power supply circuit 13 has an overvoltage fault and controls the first buzzer 143 to emit an alarm voice. And when the output current of the first power supply circuit 13 is greater than the first set current, the first protection controller 144 determines that the first power supply circuit 13 has an overcurrent fault and controls the first buzzer 143 to emit an alarm voice, thereby achieving an alarm effect. The first button 145 is electrically connected to the first protection controller 144. When the first button 145 is pressed, a de-alarm signal is output to the first protection controller 144, and the first protection controller 144 will control the first buzzer 143 to stop working. It can be understood that due to possible power fluctuations or noise interference, there is a risk that the first power supply circuit 13 may have a short-term overcurrent or overvoltage, which may cause false alarms. After the staff determines it is a false alarm, they can press the first button 145 to make the first buzzer 143 stop working.

[0067] Among them, the first voltage detection unit 141 can be an existing voltage measurement circuit, the first current detection unit 142 can be an existing current measurement circuit, and the first protection controller 144 can include an existing microprocessor (MCU) or a single-chip microcomputer and other processors.

[0068] In some embodiments, as Figure 1 shown, the transmitting end device 1 may further include a first indicator light unit 15 electrically connected to the first network processing unit 112, the first power supply circuit 13, and the first protection circuit 14.

[0069] Furthermore, in some embodiments, as Figure 4As shown, the first indicator unit 15 includes a power indicator, a status indicator, and a working indicator. The power indicator included in the first indicator unit 15 is electrically connected to the first power circuit 13 to indicate whether the first power circuit 13 is supplying power. For example, when the first power circuit 13 is supplying power to each circuit, this power indicator will be lit. The status indicator included in the first indicator unit 15 is electrically connected to the first protection controller 144 included in the first protection circuit 14 to indicate whether the first power circuit 13 has a fault. When the first protection controller 144 detects an overcurrent fault or an overvoltage fault in the first power circuit 13, it will light this status indicator, thus playing a prompting role. The working indicator included in the first indicator unit 15 is electrically connected to the first network processing unit 112 to indicate whether the first network processing unit 112 is transmitting data. To improve the indication effect, the power indicator, the status indicator, and the working indicator can be light beads of different colors.

[0070] In some embodiments, as Figure 1 shown, the transmitting end device 1 may further include a first housing 16 for accommodating the first network processing unit 112 (not shown), the first processing circuit 12, the first power circuit 13, and the first protection circuit 14. It should be noted that the first USB to network port unit 111 is arranged at the site where the imaging device is located.

[0071] Since during abnormal events in a nuclear power plant or during long-term monitoring of the on-site situation, it may be necessary to monitor the on-site images for a long time, and the long-term operation of the transmitting end device 1 may cause overheating and damage to the hardware circuit. Therefore, in some embodiments, as Figure 1 shown, the transmitting end device 1 may further include a first heat dissipation circuit 17 arranged on the first housing 16 and electrically connected to the first power circuit 13 for dissipating heat from the internal hardware circuit of the transmitting end device 1. Optionally, the first heat dissipation circuit 17 may include an existing fan arranged on the first housing 16, such as a fan with the model BP602012H WPF01. When the fan works, it can make the air flow between the inside and the outside of the first housing 16, improving the heat dissipation effect.

[0072] In some embodiments, as Figure 1 shown, the transmitting end device 1 may further include a first control switch 18 electrically connected to the first power circuit 13. Specifically, the first control switch 18 is connected between the first power circuit 13 and the commercial power and can control the power on and off of the first power circuit 13. When the staff needs to repair the transmitting end device 1 or the transmitting end device 1 does not need to operate, the first control switch 18 can be turned off. Additionally, the first control switch 18 can be an existing circuit breaker.

[0073] Please refer to Figure 1, the unidirectional laser communication device 2 may include a laser transmitting end 21 and a laser receiving end 22. The laser transmitting end 21 is electrically connected to the first processing circuit 12 to receive the processed data, convert the processed data into a laser signal, and output the laser signal to the laser receiving end 22. The laser receiving end 22 is disposed opposite to the laser transmitting end 21 to receive the laser signal output by the laser transmitting end 21, convert the laser signal into data to be restored, and output the data to be restored to the second processing circuit 31 in the receiving end device 3. Among them, the unidirectional laser communication device 2 may be an existing laser communication device or module, such as a laser communication device with the model FS-10G-LR-RX-D.

[0074] Please refer to Figure 1 , the receiving end device 3 may include a second processing circuit 31, a second communication circuit 32, a second power supply circuit 33, and a second protection circuit 34.

[0075] Please refer to Figure 1 , the second processing circuit 31 is electrically connected to the laser receiving end 22 to receive the data to be restored, process the data to be restored, and obtain and output the restored video stream data. Specifically, the second processing circuit 31 may include a second processor and an existing network communication circuit. Among them, the second processor may be an existing microprocessor (MCU) or a single-chip microcomputer, such as a processor with the model 4003A4000 produced by Loongson Technology Corporation Limited, and its function is to decompress the data to be restored to obtain the restored video stream data. The network communication circuit included in the second processing circuit 31 is used to enable the second processor to establish a communication channel with the second communication circuit 32.

[0076] Please refer to Figure 1 , the second communication circuit 32 is electrically connected to the second processing circuit 31 to receive the restored video stream data from the second processing circuit 31 and output the restored video stream data to the video display device.

[0077] Further, in some embodiments, such as Figure 2 shown, the second communication circuit 32 includes a second network processing unit 321 and a second USB to network port unit 322. The second network processing unit 321 is electrically connected to the second processing circuit 31 to obtain the restored video stream data from the second processing circuit 31 and send the restored video stream data to the local area network. The second USB to network port unit 322 is electrically connected to the second network interface unit and the video display device. The second USB to network port unit 322 obtains the restored video stream data from the second network processing unit 321 through the local area network and sends the restored video stream data to the video display device, so that the video display device can display the picture taken by the camera device according to the restored video stream data.

[0078] Please refer toFigure 1 The second power supply circuit 33 is electrically connected to the second communication circuit 32 and the second processing circuit 31 to supply power to the second communication circuit 32 and the second processing circuit 31. Specifically, the second power supply circuit 33 can be an existing switching power supply circuit or module, such as a power module with the model number GW-RC2350-2V.

[0079] Please refer to Figure 1 The second protection circuit 34 is electrically connected to the second power supply circuit 33 to give an alarm when a power supply failure occurs in the second power supply circuit 33.

[0080] Furthermore, in some embodiments, as Figure 3 shown, the second protection circuit 34 includes a second voltage detection unit 341, a second current detection unit 342, a second buzzer 343, a second protection controller 344, and a second button 345. The second voltage detection unit 341 is electrically connected to the second power supply circuit 33 to detect the output voltage of the second power supply circuit 33. The second current detection unit 342 is electrically connected to the second power supply circuit 33 to detect the output current of the second power supply circuit 33; the second buzzer 343 is used to output an alarm voice when the output voltage of the second power supply circuit 33 is overvoltage or the output current of the second power supply circuit 33 is overcurrent. The second protection controller 344 is electrically connected to the second voltage detection unit 341, the second current detection unit 342, and the second buzzer 343 to obtain the output voltage and output current of the second power supply circuit 33. When the output voltage of the second power supply circuit 33 is greater than the second set voltage, the second protection controller 344 determines that the second power supply circuit 33 has an overvoltage fault and controls the second buzzer 343 to emit an alarm voice. And when the output current of the second power supply circuit 33 is greater than the second set current, the second protection controller 344 determines that the second power supply circuit 33 has an overcurrent fault and controls the second buzzer 343 to emit an alarm voice, thereby achieving the alarm effect. The second button 345 is electrically connected to the second protection controller 344. When the second button 345 is pressed, a de-alarm signal is output to the second protection controller 344, and the second protection controller 344 will control the second buzzer 343 to stop working.

[0081] In some embodiments, as Figure 1 shown, the receiving end device 3 may further include a second indicator light unit 35 electrically connected to the second network processing unit 321, the second power supply circuit 33, and the second protection circuit 34.

[0082] Furthermore, in some embodiments, as Figure 4As shown, the second indicator unit 35 includes a power indicator, a status indicator, and a working indicator. The power indicator included in the second indicator unit 35 is electrically connected to the second power circuit 33 to indicate whether the second power circuit 33 is supplying power. For example, when the second power circuit 33 is supplying power to each circuit, this power indicator will be lit.

[0083] The status indicator included in the second indicator unit 35 is electrically connected to the second protection controller 344 included in the second protection circuit 34 to indicate whether the second power circuit 33 is faulty. When the second protection controller 344 detects an overcurrent fault or an overvoltage fault in the second power circuit 33, it will light this status indicator. The working indicator included in the second indicator unit 35 is electrically connected to the second network processing unit 321 to indicate whether the second network processing unit 321 is transmitting data.

[0084] In some embodiments, as Figure 1 shown, the receiving end device 3 may further include a second housing 36 for accommodating the second processing circuit 31, the second network processing unit 321 (not shown), the second power circuit 33, and the second protection circuit 34. It should be noted that the second USB to network port unit 322 is arranged at the site where the video display device is located.

[0085] To prevent the hardware circuits in the second housing 36 from being damaged due to overheating, in some embodiments, as Figure 1 shown, the receiving end device 3 may further include a second heat dissipation circuit 37 arranged on the second housing 36 and electrically connected to the second power circuit 33. Optionally, the second heat dissipation circuit 37 may include an existing fan arranged on the second housing 36, such as a fan with the model BP602012H WPF01. When the fan works, it can make the air flow between the inside and the outside of the second housing 36 to achieve a heat dissipation effect.

[0086] In some embodiments, as Figure 1 shown, the receiving end device 3 may further include a second control switch 38 for the second power circuit 33. Specifically, the second control switch 38 is connected between the second power circuit 33 and the mains power and can control the power on and off of the second power circuit 33. When the staff needs to repair the receiving end device 3 or the receiving end device 3 does not need to operate, the second control switch 38 can be turned off. In addition, the second control switch 38 can be an existing circuit breaker.

[0087] The technical solution of the present utility model obtains the video stream data output by the imaging device through the transmitting end device, processes the video stream data to obtain processed data, and then the laser transmitting end converts the processed data into a laser signal and sends the laser signal to the laser receiving end of the laser communication device. The laser receiving end converts the laser signal to obtain the restored video stream data. Finally, the receiving end device sends the restored video stream data to the video display device. It can be understood that the present utility model uses a unidirectional laser communication device to achieve the effect of unidirectionally transmitting the video stream data output by the imaging device to the video display device in a physically unconnected manner, improving the security, reliability, and efficiency of video stream data transmission, and playing a positive role in improving the safety of nuclear power plants.

[0088] The present utility model also provides a nuclear power plant video stream unidirectional transmission system, including an imaging device, a video display device, and the nuclear power plant video stream unidirectional transmission device provided by the embodiment of the present utility model.

[0089] It can be understood that the above embodiments only represent the preferred embodiments of the present utility model, and the description is relatively specific and detailed, but it cannot be construed as a limitation to the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made to the scope of the claims of the present utility model shall fall within the scope covered by the claims of the present utility model.

Claims

1. A one-way transmission device for video stream in a nuclear power plant, characterized in that: It comprises a transmitting end device (1), a one-way laser communication device (2) and a receiving end device (3); The transmitting end device (1) comprises: A first communication circuit (11) for electrically connecting to a camera device to obtain video stream data; a first processing circuit (12) electrically connected to the first communication circuit (11) to receive the video stream data and output processed data; a first power supply circuit (13) electrically connected to the first communication circuit (11) and the first processing circuit (12) for supplying power to the first communication circuit (11) and the first processing circuit (12); and a first protection circuit (14) electrically connected to the first power supply circuit (13) and configured to generate an alarm when a power supply failure occurs in the first power supply circuit (13); The one-way laser communication device (2) comprises: a laser emitting end (21) electrically connected to the first processing circuit (12) and configured to receive the processed data and output a laser signal; A laser receiving end (22) is arranged opposite to the laser emitting end (21) and is used to receive the laser signal and output the data to be restored; The receiving end device (3) comprises: A second processing circuit (31) electrically connected to the laser receiving end (22) and configured to receive the data to be restored and output restored video stream data; a second communication circuit (32) electrically connected to the second processing circuit (31) and configured to output the restored video stream data to a video display device; a second power supply circuit (33) electrically connected to the second communication circuit (32) and the second processing circuit (31) for supplying power to the second communication circuit (32) and the second processing circuit (31); and A second protection circuit (34) is electrically connected to the second power supply circuit (33) and is used to alarm when a power supply failure occurs in the second power supply circuit (33).

2. The one-way transmission device for video stream in a nuclear power plant according to claim 1, characterized in that: The first communication circuit (11) comprises: A first USB to Ethernet port unit (111) for electrically connecting to the camera device to obtain the video stream data; and A first network processing unit (112) electrically connected to the first USB to network port unit (111) and the first processing circuit (12); The second communication circuit (32) comprises: a second network processing unit (321) electrically connected to the second processing circuit (31); A second USB to network port unit (322) electrically connected to the second network processing unit and the video display device.

3. The one-way transmission device for video stream in a nuclear power plant according to claim 2, characterized in that: The transmitting end device (1) further comprises a first indicator light unit (15) electrically connected to the first network processing unit (112), the first power supply circuit (13) and the first protection circuit (14); The receiving end device (3) further comprises a second indicator light unit (35) electrically connected to the second network processing unit (321), the second power supply circuit (33) and the second protection circuit (34).

4. The one-way transmission device for video stream in a nuclear power plant according to claim 3, characterized in that: The first indicator light unit (15) and the second indicator light unit (35) respectively comprise: a power indicator light electrically connected to the first power circuit (13) or the second power circuit (33) for indicating whether the power circuit connected thereto is supplying power; a status indicator light electrically connected to the first protection circuit (14) or the second protection circuit (34) for indicating whether the power circuit connected thereto is faulty; and A working indicator light electrically connected to the first network processing unit (112) or the second network processing unit (321) for displaying whether the network processing unit connected thereto is transmitting data.

5. The one-way transmission device for video stream in a nuclear power plant according to claim 1, characterized in that: The first protection circuit (14) comprises: a first voltage detection unit (141) electrically connected to the first power supply circuit (13) and used for detecting an output voltage of the first power supply circuit (13); a first current detection unit (142) electrically connected to the first power supply circuit (13) and used for detecting an output current of the first power supply circuit (13); A first buzzer (143) for outputting an alarm voice when the output voltage of the first power supply circuit (13) is over-voltage or the output current of the first power supply circuit (13) is over-current; a first protection controller (144) electrically connected to the first voltage detection unit (141), the first current detection unit (142) and the first buzzer (143); and a first button (145) electrically connected to the first protection controller (144); The second protection circuit (34) comprises: a second voltage detection unit (341) electrically connected to the second power supply circuit (33) and used for detecting an output voltage of the second power supply circuit (33); a second current detection unit (342) electrically connected to the second power supply circuit (33) and used for detecting an output current of the second power supply circuit (33); A second buzzer (343) for outputting an alarm voice when the output voltage of the second power supply circuit (33) is over-voltage or the output current of the second power supply circuit (33) is over-current; a second protection controller (344) electrically connected to the second voltage detection unit (341), the second current detection unit (342) and the second buzzer (343); and A second button (345) electrically connected to the second protection controller (344).

6. The one-way transmission device for video stream in a nuclear power plant according to any one of claims 1 to 5, characterized in that: The transmitting end device (1) further comprises a first housing (16) for accommodating the first processing circuit (12), the first power supply circuit (13) and the first protection circuit (14); The receiving end device (3) also includes a second housing (36) for accommodating a second processing circuit (31), a second power supply circuit (33) and a second protection circuit (34).

7. The one-way transmission device for video stream in a nuclear power plant according to claim 6, characterized in that: The transmitting end device (1) further comprises a first heat dissipation circuit (17) which is arranged on the first housing (16) and is electrically connected to the first power supply circuit (13); The receiving end device (3) further comprises a second heat dissipation circuit (37) which is arranged on the second housing (36) and is electrically connected to the second power supply circuit (33).

8. The one-way transmission device for video stream in a nuclear power plant according to claim 7, characterized in that: The first heat dissipation circuit (17) and the second heat dissipation circuit (37) respectively comprise a fan arranged on the first shell (16) or the second shell (36).

9. The one-way transmission device for video stream in a nuclear power plant according to any one of claims 1 to 5, characterized in that: The transmitting end device (1) further comprises a first control switch (18) electrically connected to the first power supply circuit (13); The receiving end device (3) also includes a second control switch (38) connected to the second power supply circuit (33).

10. A one-way transmission system for video streams in a nuclear power plant, characterized in that: The device comprises a camera device, a video display device and a one-way transmission device for video stream of a nuclear power plant as claimed in any one of claims 1 to 9.

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