Constant-voltage power supply circuit of photoelectric sensor and nuclear power station air purification testing device

Abstract

The utility model relates to a constant-voltage power supply circuit of a photoelectric sensor and a nuclear power station air purification testing device. The constant-voltage power supply circuit comprises a multi-gear selection switch, a voltage stabilizing capacitor, a resistor and a power supply. A second pin of a first gear of the multi-gear selection switch is connected with one end of the photoelectric sensor through the resistor, a first pin of the first gear of the multi-gear selection switch is connected with the other end of the photoelectric sensor, and two ends of the voltage stabilizing capacitor are respectively connected with a first pin of a second gear and a second pin of the first gear of the multi-gear selection switch. And the power supply is connected with the second gear of the multi-gear selection switch. According to the utility model, constant-voltage power supply for the photoelectric sensor can be realized, unstable measurement caused by battery voltage attenuation is avoided, radioactive risks and hazards introduced in an iodine adsorber test are avoided, and the safety production level of a power plant is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply circuits, in particular to a constant voltage power supply circuit of a photoelectric sensor and an air purification test device for a nuclear power station. Background Art

[0002] Generally, nuclear power plants use activated carbon iodine adsorbers to purify nuclear air. The iodine adsorbers need to be tested for purification efficiency using radioactive methyl iodide every year. However, since the test introduces non-sealed radioactive materials, the risk and hazard of leakage are very high.

[0003] Therefore, a solution using non-radioactive methyl iodide as an iodine adsorber was developed, which avoids the risk and harm of radioactive leakage. Since the new solution uses a photoelectric sensor to measure the concentration of methyl iodine, the accuracy of the photoelectric sensor measurement depends on the quality of the power supply to the photoelectric sensor. General batteries will experience voltage decay as the use time increases, which will cause the sensor output signal to decrease. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a constant voltage power supply circuit of a photoelectric sensor and an air purification test device for a nuclear power plant.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a constant voltage power supply circuit of a photoelectric sensor, the constant voltage power supply circuit comprising a multi-speed selection switch, a voltage stabilizing capacitor, a resistor, and a power supply;

[0006] The second pin of the first gear of the multi-speed selection switch is connected to one end of the photoelectric sensor via the resistor, the first pin of the first gear of the multi-speed selection switch is connected to the other end of the photoelectric sensor, and the two ends of the voltage-stabilizing capacitor are respectively connected to the first pin of the second gear of the multi-speed selection switch and the second pin of the first gear; the power supply is connected to the second gear of the multi-speed selection switch.

[0007] Furthermore, in the constant voltage power supply circuit of the photoelectric sensor described in the utility model, the third gear of the multi-gear selection switch is connected to a charging interface for charging the power supply.

[0008] Furthermore, in the constant voltage power supply circuit of the photoelectric sensor described in the utility model, the constant voltage power supply circuit also includes a charging indicator light, and the two ends of the charging indicator light are respectively connected to the second pin of the second gear and the first pin of the third gear of the multi-speed selection switch.

[0009] Furthermore, in the constant voltage power supply circuit of the photoelectric sensor described in the utility model, the constant voltage power supply circuit also includes a power supply indicator light connected to the first gear position of the multi-gear selection switch.

[0010] Furthermore, in the constant voltage power supply circuit of the photoelectric sensor described in the utility model, the power supply is a lithium battery.

[0011] Furthermore, in the constant voltage power supply circuit of the photoelectric sensor described in the utility model, the multi-speed selection switch is a three-speed selection switch.

[0012] Furthermore, in the constant voltage power supply circuit of the photoelectric sensor described in the utility model, the resistor is an adjustable resistor.

[0013] Furthermore, in the constant voltage power supply circuit of the photoelectric sensor described in the utility model, the power supply voltage range provided by the constant voltage power supply circuit for the photoelectric sensor is between 1.5V and 4.5V.

[0014] Furthermore, in the constant voltage power supply circuit of the photoelectric sensor described in the utility model, the constant voltage power supply duration provided by the constant voltage power supply circuit to the photoelectric sensor is greater than or equal to 36 hours.

[0015] In addition, the utility model also provides a nuclear power plant air purification test device, including a photoelectric sensor and the above-mentioned constant voltage power supply circuit.

[0016] The implementation of the constant voltage power supply circuit of the photoelectric sensor and the nuclear power plant air purification test device of the utility model has the following beneficial effects: the utility model can realize constant voltage power supply for the photoelectric sensor, avoid measurement instability caused by battery voltage attenuation, help avoid radioactive risks and hazards introduced in iodine adsorber tests, and further improve the safety production level of power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0018] Figure 1 It is a structural schematic diagram of a constant voltage power supply circuit of a photoelectric sensor according to an embodiment of the utility model;

[0019] Figure 2 is a schematic diagram of a constant voltage power supply circuit of a photoelectric sensor in some embodiments of the utility model;

[0020] Figure 3 is a schematic diagram of a constant voltage power supply circuit of a photoelectric sensor in some embodiments of the utility model;

[0021] Figure 4 It is a schematic diagram of a constant voltage power supply circuit of a photoelectric sensor in some embodiments of the present utility model.

[0022] In the figure: 10 - photoelectric sensor, 20 - power supply, 30 - multi-speed selection switch, 40 - charging interface. DETAILED DESCRIPTION

[0023] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.

[0024] In the following description, specific details such as specific system structures and technologies are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details that hinder the description of the present invention.

[0025] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0026] It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more centered elements can exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more centered elements can exist between them. When the terms "vertical", "horizontal", "left", "right", "upper", "lower", "inner", "outer", "bottom" and the like are used to indicate an orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. It should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0028] Voltage attenuation refers to general rechargeable batteries or dry batteries. The voltage of constant voltage batteries will not decay. However, the voltage provided by constant voltage batteries cannot meet the working requirements of the photoelectric sensor of the utility model for measuring methyl iodide concentration. Moreover, constant voltage batteries also need to be combined with voltage stabilizing capacitors and voltage regulating resistors to meet the use requirements.

[0029] In a preferred embodiment, reference Figure 1 and Figure 4 The constant voltage power supply circuit of the photoelectric sensor of this embodiment includes a multi-speed selection switch, a voltage stabilizing capacitor, a resistor, and a power supply. The power supply is preferably a rechargeable power supply, such as a lithium battery, so that the constant voltage power supply circuit can realize the cyclic use of charging and power supply.

[0030] The second pin of the first gear of the multi-gear selection switch is connected to one end of the photoelectric sensor via a resistor, the first pin of the first gear of the multi-gear selection switch is connected to the other end of the photoelectric sensor, and the two ends of the voltage stabilizing capacitor are respectively connected to the first pin of the second gear of the multi-gear selection switch and the second pin of the first gear. The power supply is connected to the second gear of the multi-gear selection switch.

[0031] The resistor of this embodiment is preferably an adjustable resistor, which allocates a suitable power supply voltage to the photoelectric sensor, and can achieve different voltage requirements of the photoelectric sensor from 1.5V to 4.5V, thereby realizing a long-term constant voltage and adjustable power supply. For example, the voltage is adjusted to the required 3.6 V by adjusting the resistor. This embodiment adopts a large-capacity voltage-stabilizing capacitor, and the main function of the voltage-stabilizing capacitor is to meet the large flow demand of the pneumatic moment, and can further stabilize the voltage and avoid voltage changes caused by load fluctuations. The multi-speed selection switch of this embodiment is preferably a three-speed selection switch, so that the constant voltage power supply circuit can realize three working states of charging, power supply, and power outage.

[0032] In this embodiment, constant voltage power supply to the photoelectric sensor can be achieved, thereby avoiding unstable measurement caused by battery voltage attenuation.

[0033] In some embodiments, Figure 2 As shown, the constant voltage power supply circuit of this embodiment also includes a charging interface, and the third gear of the multi-gear selection switch is connected to the charging interface for charging the power supply.

[0034] In some embodiments, reference Figure 3 The power supply circuit of this embodiment further includes a charging indicator light, and the two ends of the charging indicator light are respectively connected to the second pin of the second gear and the first pin of the third gear of the multi-gear selection switch. Optionally, the power supply circuit further includes a power supply indicator light connected to the first gear of the multi-gear selection switch.

[0035] It should be noted that the connection method of the power supply indicator light and the charging indicator light with the multi-speed selection switch in this embodiment is the preferred connection method, and other connection methods are not excluded as long as they do not affect the normal working state of the entire power supply circuit or cause misleading charging / power supply indication.

[0036] like Figure 4 As shown, the working principle of the utility model is: when the three-speed selection switch is turned to the left side (first gear), the photoelectric sensor is powered, and the power supply indicator light in the circuit is on. After the power supply voltage is divided by the adjustable resistor, it meets the corresponding voltage demand of the photoelectric sensor, and the voltage stabilizing capacitor avoids voltage fluctuations caused by startup and load fluctuations. When the three-speed selection switch stops in the middle position (second gear), the power supply and the voltage stabilizing capacitor stop supplying power to the photoelectric sensor, and the power supply indicator light goes out. When the three-speed selection switch is turned to the right side (third gear), the charging interface is connected to the external charging power supply, the charging indicator light is on, and the power supply is charged.

[0037] The constant voltage power supply circuit of the utility model can provide a dedicated stable constant voltage power supply for the non-emission methyl iodide tester, so that the photoelectric sensor of the non-emission methyl iodide tester can measure the gas concentration at the ppb level. It is an indispensable part of the non-emission methyl iodide tester and improves the safety production level of the power plant.

[0038] The utility model can provide the photoelectric sensor with a constant voltage power supply for a time greater than or equal to 36 hours, which is far longer than the 2 hours required for the test. In other words, the power supply time is greater than 36 hours, which means that when the battery is fully charged, the photoelectric sensor can be provided with continuous power supply for more than 36 hours. Under normal circumstances, the photoelectric sensor can only work for a maximum of 2 hours each time. Sometimes, multiple tests need to be carried out in succession during field tests. The actual field use may reach 4 hours, but rarely exceeds 6 hours. There is sufficient margin in the design.

[0039] In another preferred embodiment, the nuclear power plant air purification test device of this embodiment includes a photoelectric sensor and a constant voltage power supply circuit as described above. This embodiment can realize constant voltage power supply for the photoelectric sensor and avoid measurement instability caused by battery voltage attenuation.

[0040] The resistor of this embodiment is preferably an adjustable resistor, which allocates a suitable power supply voltage to the photoelectric sensor, and can achieve different voltage requirements of the photoelectric sensor from 1.5V to 4.5V, thereby realizing long-term constant voltage and adjustable power supply. For example, the voltage is adjusted to the required 3.6 V by adjusting the resistor. This embodiment adopts a large-capacity voltage-stabilizing capacitor, which can further stabilize the voltage and avoid voltage changes caused by load fluctuations. The multi-speed selection switch of this embodiment is preferably a three-speed selection switch, so that the constant voltage power supply circuit can achieve three working states: charging, power supply, and power outage. The power supply time that can provide continuous constant voltage power supply to the photoelectric sensor is greater than or equal to 36 hours, which far exceeds the time required for the test of 2 hours. In other words, the power supply time is greater than 36 hours, which means that when the battery is fully charged, the photoelectric sensor can be provided with continuous power supply for more than 36 hours. Under normal circumstances, the photoelectric sensor can work continuously for a maximum of 2 hours each time. Field tests sometimes need to be carried out multiple times in succession. The actual use on site may reach 4 hours, but rarely exceeds 6 hours, and there is sufficient margin in the design.

[0041] In this embodiment, the nuclear power plant air purification test device can further stably and accurately measure the gas concentration at the ppb level, ensuring the feasibility of the non-radioactive methyl iodide test technical solution, avoiding the radioactive risks and hazards introduced in the iodine adsorber test, and improving the safety production level of the power plant.

[0042] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should belong to the scope covered by the claims of the utility model.

Claims

1. A constant voltage power supply circuit for a photoelectric sensor, characterized in that: The constant voltage power supply circuit includes a multi-speed selection switch, a voltage stabilizing capacitor, a resistor, and a power supply; The second pin of the first gear of the multi-speed selection switch is connected to one end of the photoelectric sensor via the resistor, the first pin of the first gear of the multi-speed selection switch is connected to the other end of the photoelectric sensor, and the two ends of the voltage-stabilizing capacitor are respectively connected to the first pin of the second gear of the multi-speed selection switch and the second pin of the first gear; the power supply is connected to the second gear of the multi-speed selection switch.

2. The constant voltage power supply circuit of the photoelectric sensor according to claim 1, characterized in that: The third gear of the multi-gear selection switch is connected to a charging interface for charging the power supply.

3. The constant voltage power supply circuit of the photoelectric sensor according to claim 2, characterized in that: The constant voltage power supply circuit also includes a charging indicator light, and two ends of the charging indicator light are respectively connected to the second pin of the second gear and the first pin of the third gear of the multi-gear selection switch.

4. The constant voltage power supply circuit of the photoelectric sensor according to claim 1, characterized in that: The constant voltage power supply circuit also includes a power supply indicator light connected to the first gear position of the multi-gear selection switch.

5. The constant voltage power supply circuit of the photoelectric sensor according to claim 1, characterized in that: The power supply is a lithium battery.

6. The constant voltage power supply circuit of the photoelectric sensor according to claim 1, characterized in that: The multi-speed selection switch is a three-speed selection switch.

7. The constant voltage power supply circuit of the photoelectric sensor according to claim 1, characterized in that: The resistor is an adjustable resistor.

8. The constant voltage power supply circuit of the photoelectric sensor according to claim 7, characterized in that: The constant voltage power supply circuit provides a power supply voltage ranging from 1.5V to 4.5V for the photoelectric sensor.

9. The constant voltage power supply circuit of the photoelectric sensor according to claim 1, characterized in that: The constant voltage power supply circuit provides the photoelectric sensor with constant voltage power supply for a period greater than or equal to 36 hours.

10. A nuclear power plant air purification test device, comprising a photoelectric sensor, characterized in that: It also includes the constant voltage power supply circuit according to any one of claims 1 to 9.

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