Portable arc extinguishing electromagnetic valve calibration device for nuclear power

Abstract

The utility model relates to a portable arc extinguishing electromagnetic valve calibration device for nuclear power, which comprises an LCD digital display resistance meter, a light emitting diode, a battery pack, a test switch, an alligator clip test wire, an insulating handle body and a probe. The alligator clip test wire is electrically connected to the negative pole of the battery pack and the input end of the LCD digital display resistance meter, and the output end of the LCD digital display resistance meter is electrically connected to the probe. The positive pole of the battery pack is connected in series with the test switch and the light emitting diode, and then electrically connected to the probe. In use, the alligator clip test wire is clamped on the terminal of the electromagnetic valve cable to be tested, and the probe contacts the terminal of another cable of the electromagnetic valve. When the test switch is pressed, if the light emitting diode is lighted and the resistance value displayed by the LCD digital display resistance meter approaches 0Ω, it indicates that the terminal connected by the probe is the positive terminal of the electromagnetic valve coil, and vice versa. The utility model has compact structure, convenient operation, safety and reliability, and can quickly and accurately identify the polarity of the arc extinguishing electromagnetic valve coil.

Description

Technical Field

[0001] This utility model relates to the field of inspection and maintenance technology of electrical equipment in nuclear power plants, and in particular to a portable arc-extinguishing solenoid valve calibration device for nuclear power plants. Background Technology

[0002] In the nuclear island system of a nuclear power plant, reliable control of core pneumatic valves is crucial. These valves commonly employ air-source / pilot solenoid valves as their drive and control devices. The opening and closing of the valve is achieved by controlling the solenoid valve coil through energization and de-energization, thereby regulating the air path. To protect the drive-side electronic components (such as transistors or relay contacts) from damage caused by the reverse electromotive force (reverse peak voltage) generated when the solenoid valve coil is de-energized, a reverse diode is typically connected in parallel across the coil to form an arc-extinguishing circuit. When the coil is de-energized, the self-induced current it generates can pass through this diode to form a discharge circuit, rapidly decaying to zero, thus effectively eliminating the arc and protecting the drive circuit.

[0003] During routine maintenance and overhauls of nuclear power plants, the disassembly and reassembly of solenoid valves are standard operating procedures. However, due to the complex working environment, aging cables, or missing / damaged markings, the positive and negative polarity markings on the solenoid valve coil leads are often missing or difficult to identify. Traditional polarity calibration methods mainly rely on using a multimeter to measure resistance or continuity settings for determination.

[0004] 1. Resistance method: Measure the resistance between the two ends of the wire. The resistance value is usually the DC resistance of the coil (a few ohms to tens of ohms), but this method cannot directly distinguish between positive and negative terminals.

[0005] 2. Continuity / Diode Range Method: This method uses the diode range of a multimeter for measurement. When the red probe is connected to the positive terminal of the coil and the black probe to the negative terminal, the multimeter displays an open circuit or high resistance because the parallel diode is in reverse cutoff. When the red probe is connected to the negative terminal and the black probe to the positive terminal, the diode conducts in the forward direction, and the multimeter displays a diode voltage drop (approximately 0.5-0.7V). This method is theoretically feasible, but it has significant drawbacks in practical applications:

[0006] (1) Susceptible to interference: The environment at nuclear power plant sites is complex and the space is narrow. The tiny voltage values ​​(0.5-0.7V) displayed on the multimeter screen or the on / off prompt sound are easily misread or ignored.

[0007] (2) Cumbersome operation: It requires two hands to operate two probes to contact two terminals respectively, which is inconvenient to work in narrow spaces or at high places.

[0008] (3) High risk of misjudgment: The interpretation of test results depends on the operator's experience and attention, which can easily lead to incorrect polarity judgment in complex environments.

[0009] Serious consequences of reversed polarity: Reversing the positive and negative terminals of a solenoid valve coil is equivalent to short-circuiting the positive and negative terminals of the drive power supply directly through a diode connected in parallel. Although the coil itself will not short-circuit and burn out, once the drive side (such as the control board in the cabinet) is powered on, a huge short-circuit current will flow directly through the diode, which could potentially burn out fragile electronic components on the drive side (such as output transistors, relay contacts, or fuses) instantly. This could lead to equipment failure and shutdown, or even more serious safety hazards, posing a direct threat to the safe and stable operation of the nuclear power plant.

[0010] Therefore, there is an urgent need to develop a portable tool that is easy to operate, provides intuitive instructions, yields reliable results, and is specifically designed for the rapid identification of the polarity of arc-extinguishing solenoid valve coils in nuclear power plants. This tool would overcome the shortcomings of existing technologies and ensure the safety, efficiency, and accuracy of maintenance work. Utility Model Content

[0011] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a portable arc-extinguishing solenoid valve calibration device for nuclear power plants. It has the advantages of dual indication, accurate and reliable results, extremely simple and efficient operation, clear and intuitive indication, and strong anti-interference.

[0012] The objective of this utility model can be achieved through the following technical solutions:

[0013] The purpose of this invention is to provide a portable arc-extinguishing solenoid valve calibration device for nuclear power plants. The device includes an insulated handle, a battery pack, a test switch, an LCD digital display resistance meter, a light-emitting diode, a probe, and alligator clip test leads. The battery pack is disposed inside the insulated handle. The test switch, the LCD digital display resistance meter, and the light-emitting diode are all disposed on the surface of the insulated handle. The probe and the alligator clip test leads are all disposed on the outside of the insulated handle.

[0014] Furthermore, the alligator clip test lead is electrically connected to the negative terminal of the battery pack and the input terminal of the LCD digital display resistance meter; the output terminal of the LCD digital display resistance meter is electrically connected to the probe; the positive terminal of the battery pack is connected to the light-emitting diode and the test switch in series and then electrically connected to the probe.

[0015] Furthermore, the probe and the alligator clip test line are respectively disposed at both ends of the insulating handle.

[0016] Furthermore, the insulating handle body is a shell injection molded from ABS engineering plastic.

[0017] Furthermore, the light-emitting diode is a violet light-emitting diode.

[0018] Furthermore, the test switch is an anti-accidental touch button switch.

[0019] Furthermore, the test switch is a push-button switch with a protective structure to prevent accidental touches.

[0020] Furthermore, the protective structure is a push-button switch protective cover.

[0021] Furthermore, the battery pack is a DC battery pack with an output voltage of 4.5V.

[0022] Furthermore, the device is used for calibrating portable arc-extinguishing solenoid valves.

[0023] Furthermore, the portable arc-extinguishing solenoid valve includes a solenoid valve coil and an arc-extinguishing diode connected in parallel with the solenoid valve coil.

[0024] Furthermore, the portable arc-extinguishing solenoid valve also includes two terminals.

[0025] Furthermore, the range of the LCD digital display resistance meter includes 0Ω to the typical resistance range of the solenoid valve coil.

[0026] Furthermore, the alligator clip test lead is used to clamp onto one terminal of the portable arc-extinguishing solenoid valve; the probe is used to contact the other terminal of the portable arc-extinguishing solenoid valve.

[0027] Furthermore, the two terminals are the positive terminal and the negative terminal of the solenoid valve coil, respectively.

[0028] Furthermore, the insulated handle serves as both the main support for the device and the handheld part, ensuring safe operation.

[0029] Furthermore, the battery pack is built into the insulated handle to provide operating power (preferably 4.5V DC) for the entire device.

[0030] Furthermore, the test switch is located on the surface of the insulated handle, preferably a push-button switch with a protective structure to prevent accidental contact, and is used to control the on / off state of the test circuit.

[0031] Furthermore, the LCD digital display ohmmeter is integrated into the surface of the insulated handle to display the resistance value between the two points being measured in real time.

[0032] Furthermore, the light-emitting diode is preferably a violet light-emitting diode (high visibility), integrated on the surface of the insulated handle body, to provide a light indication of the conduction status.

[0033] Furthermore, the probe is fixed to the front end of the insulated handle for direct contact with the terminal of the solenoid valve's cable under test.

[0034] Furthermore, the alligator clip test leads are connected to the internal circuitry of the insulated handle via wires. The alligator clip with the insulated handle is used to hold another terminal of the solenoid valve cable under test.

[0035] Furthermore, the working method of the portable arc-extinguishing solenoid valve calibration device for nuclear power plants includes the following steps:

[0036] S1. Clamp the alligator clip test line to one terminal of the solenoid valve;

[0037] S2. Contact the probe with the other terminal of the solenoid valve;

[0038] S3. Press the test switch;

[0039] S4. Observe the lighting status of the LED and the display value of the LCD digital display resistance meter;

[0040] If the LED is lit and the LCD digital resistance meter displays a resistance value close to 0Ω, then the terminal contacted by the probe is the positive terminal of the solenoid valve coil; if the LED is not lit and the LCD digital resistance meter displays a resistance value much greater than 0Ω (usually an open circuit or coil resistance value), then the terminal contacted by the probe is the negative terminal of the solenoid valve coil.

[0041] Furthermore, the working principle and usage method of the portable arc-extinguishing solenoid valve calibration device for nuclear power plants include:

[0042] 1. Clamp the alligator clip test lead onto one terminal (terminal A) of the solenoid valve cable under test.

[0043] 2. Touch the tip of the probe to the other terminal (terminal B) of the solenoid valve cable under test.

[0044] 3. Press the test switch.

[0045] 4. Judgment:

[0046] Scenario 1 (Probe connected to positive terminal): If terminal B is the positive (+) terminal of the solenoid valve coil and terminal A is the negative (-) terminal of the solenoid valve coil, the current path is: battery positive terminal → LED → LCD digital ohmmeter → test switch → probe → terminal B → solenoid valve coil positive terminal (+) → solenoid valve coil → solenoid valve coil negative terminal (-) → terminal A → alligator clip test lead → battery negative terminal. In this circuit, the LED receives a positive voltage and lights up. Simultaneously, the LCD digital ohmmeter measures the resistance between the probe and the alligator clip test lead. Since the probe is directly connected to the positive (+) terminal of the solenoid valve coil through point contact, and the alligator clip test lead is clamped to the negative (-) terminal of the solenoid valve coil, and the solenoid valve coil itself has a very small resistance (usually much less than 1Ω), the LCD digital ohmmeter will display a low resistance value close to 0Ω (actually the DC resistance of the solenoid valve coil).

[0047] Case 2 (Probe connected to negative terminal): If terminal B is the negative terminal (-) of the solenoid valve coil and terminal A is the positive terminal (+) of the solenoid valve coil, the attempted current path is: battery pack positive terminal LED → LCD digital display ohmmeter → test switch → probe → terminal B → solenoid valve coil negative terminal (-) → solenoid valve coil → solenoid valve coil positive terminal (+) → terminal A → alligator clip test lead → battery pack negative terminal. In this path, the LED requires current to flow from the probe (connected to negative terminal), which violates the unidirectional conductivity of the LED, so the LED will not light up. Simultaneously, the LCD digital display ohmmeter measures the resistance between the probe (connected to negative terminal) and the alligator clip test lead (clamped to positive terminal). Due to the presence of a parallel arc-extinguishing diode (its positive terminal connected to the negative terminal (-) of the solenoid valve coil and its negative terminal connected to the positive terminal (+)), when the probe is connected to negative terminal and the alligator clip is connected to positive terminal, the arc-extinguishing diode is in a reverse cutoff state. Therefore, the LCD digital resistance meter will display a high resistance value or an open circuit state (displaying "OL" or a very large resistance value, much larger than the resistance of the solenoid valve coil).

[0048] Conclusion: After pressing the test switch,

[0049] 1. If the LED is lit and the LCD digital resistance meter shows a resistance value close to 0Ω, then the terminal B that the probe is in contact with is the positive (+) terminal of the solenoid valve coil.

[0050] If the LED does not light up and the LCD digital resistance meter displays a high resistance value / open circuit, then the terminal B that the probe is in contact with is the negative (-) terminal of the solenoid valve coil.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] 1) The portable arc-extinguishing solenoid valve calibration device for nuclear power plants provided by this utility model has the advantages of dual indication and accurate and reliable results. It combines the light signal of the LED turning on / off and the electrical signal of the LCD digital display resistance meter showing 0Ω / high resistance for judgment. The two mutually verify each other, which greatly improves the accuracy and reliability of polarity judgment and effectively avoids misjudgment that may be caused by a single indication (such as looking at only a small voltage value or listening to the buzzer).

[0053] 2) The portable arc-extinguishing solenoid valve calibration device for nuclear power provided by this utility model is extremely simple and efficient to operate. It only requires "one clamp, one touch, and one press" and can be operated with one hand (the alligator clip fixes one terminal, the probe touches the other terminal, and the thumb presses the switch). It is particularly suitable for complex working environments such as confined spaces and high altitudes in nuclear power plants, and significantly improves work efficiency.

[0054] 3) The portable arc-extinguishing solenoid valve calibration device for nuclear power provided by this utility model has clear and intuitive indications, strong anti-interference capabilities, and the on / off status of the light-emitting diodes and the resistance values ​​on the LCD screen (especially the display of 0Ω) are very conspicuous and intuitive. It is not easily affected by environmental factors such as ambient light and noise, and reduces the dependence on the operator's experience.

[0055] 4) The portable arc-extinguishing solenoid valve calibration device for nuclear power plants provided by this utility model is inherently safe, avoiding equipment risks. The device itself adopts a low-voltage (4.5V) power supply and a fully insulated design (ABS handle), ensuring safety for the equipment under test. More importantly, its core function lies in accurately identifying polarity, eliminating the risk of short circuits caused by reversed coil polarity, which could lead to damage to downstream control equipment and ensure the safe operation of critical equipment in nuclear power plants.

[0056] 5) The portable arc-extinguishing solenoid valve calibration device for nuclear power plants provided by this utility model adopts a portable integrated design. All functional modules (power supply, switch, indicator, measuring instrument, test probe) are integrated into a compact handheld insulated handle. It is small in size, light in weight, easy to carry and use, and meets the needs of on-site maintenance tools.

[0057] 5) The portable arc-extinguishing solenoid valve calibration device for nuclear power plants provided by this utility model can be used specifically for arc-extinguishing solenoid valves: designed for the coil structure characteristics of arc-extinguishing solenoid valves (with parallel reverse diodes) in nuclear power plants, the working principle makes full use of the unidirectional conductivity of diodes, which is an efficient solution for this specific scenario. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of the structure of the portable arc-extinguishing solenoid valve calibration device for nuclear power plants in an embodiment of this utility model.

[0059] Figure 2 This is a control circuit diagram of the portable arc-extinguishing solenoid valve calibration device for nuclear power plants in an embodiment of this utility model.

[0060] in:

[0061] 1-LCD digital display resistance meter, 2-Light emission diode, 3-Battery pack, 4-Test switch, 5-Alligator clip test leads, 6-Insulated handle, 7-Probe probe;

[0062] 801, Solenoid valve coil; 802, Arc-extinguishing diode. Detailed Implementation

[0063] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Component models, material names, connection structures, and other features not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0064] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0065] This utility model relates to a portable arc-extinguishing solenoid valve calibration device for nuclear power plants, specifically in the field of nuclear power plant inspection and maintenance technology. The device includes an LCD digital display ohmmeter 1, a light-emitting diode 2, a battery pack 3 integrated inside the handle, a test switch 4, alligator clip test leads 5, an insulated handle 6, and a probe 7 located outside the handle. The alligator clip test leads 5 are electrically connected to the negative terminal of the battery pack 3 and the input terminal of the LCD digital display ohmmeter 1, while the output terminal of the LCD digital display ohmmeter 1 is electrically connected to the probe 7. The positive terminal of the battery pack 3 is connected in series with the test switch 4 and the light-emitting diode 2, and then electrically connected to the probe 7. In use, the alligator clip test leads 5 are clamped to the terminal of the solenoid valve cable to be tested, and the probe 7 contacts the other terminal of the solenoid valve cable. Pressing the test switch 4, if the light-emitting diode 2 illuminates and the LCD digital display ohmmeter 1 displays a resistance value close to 0Ω, it indicates that the side connected to the probe 7 is the positive terminal of the solenoid valve coil; otherwise, it is the negative terminal. This utility model has a compact structure, is easy to operate, and is safe and reliable. It can quickly and accurately identify the polarity of the arc-extinguishing solenoid valve coil, effectively avoid equipment risks caused by wiring errors, and significantly improve the efficiency and safety of nuclear power plant maintenance work.

[0066] Example 1

[0067] like Figure 1 , 2 As shown, this embodiment provides a portable arc-extinguishing solenoid valve calibration device for nuclear power plants. The device includes an insulating handle 6, a battery pack 3, a test switch 4, an LCD digital display ohmmeter 1, a light-emitting diode 2, a probe 7, and alligator clip test leads 5. The battery pack 3 is disposed inside the insulating handle 6. The test switch 4, the LCD digital display ohmmeter 1, and the light-emitting diode 2 are all disposed on the surface of the insulating handle 6. The probe 7 and the alligator clip test leads 5 are all disposed outside the insulating handle 6.

[0068] The alligator clip test lead 5 is electrically connected to the negative terminal of the battery pack 3 and the input terminal of the LCD digital resistance meter 1; the output terminal of the LCD digital resistance meter 1 is electrically connected to the probe 7; the positive terminal of the battery pack 3 is connected to the light-emitting diode 2 and the test switch 4 in series, and then electrically connected to the probe 7. Figure 2 As shown, the alligator clip test lead 5, battery pack 3, LED 2, LCD digital display resistance meter 1, test switch 4, and probe 7 are connected in sequence.

[0069] The probe 7 and the alligator clip test line 5 are respectively located at both ends of the insulating handle 6.

[0070] The insulating handle body 6 is a shell made of ABS engineering plastic injection molding (ABS engineering plastic injection molding is not an improvement of the present invention, but adopts existing technology).

[0071] The light-emitting diode 2 is a violet light-emitting diode.

[0072] The test switch 4 is an anti-accidental touch button switch.

[0073] The battery pack 3 is a DC battery pack with an output voltage of 4.5V.

[0074] Battery pack 3, test switch 4, LCD digital display resistance meter 1, light-emitting diode 2, probe 7, and alligator clip test leads 5 are all commercially available or purchased components.

[0075] The device is used for calibrating portable arc-extinguishing solenoid valves.

[0076] The portable arc-extinguishing solenoid valve includes a solenoid valve coil 801 and an arc-extinguishing diode 802 connected in parallel with the solenoid valve coil 801.

[0077] The portable arc-extinguishing solenoid valve also includes two terminals.

[0078] The range of the LCD digital display ohmmeter 1 includes 0Ω to the typical resistance range of the solenoid valve coil.

[0079] The alligator clip test lead 5 is used to clamp onto one terminal of the portable arc-extinguishing solenoid valve; the probe 7 is used to contact the other terminal of the portable arc-extinguishing solenoid valve.

[0080] The two terminals are the positive terminal and the negative terminal of the solenoid valve coil, respectively.

[0081] The insulated handle 6 serves as the main support and handheld part of the device, ensuring safe operation.

[0082] The battery pack 3 is built into the insulated handle 6 and provides power (preferably 4.5V DC) for the entire device.

[0083] Test switch 4 is disposed on the surface of insulating handle 6, preferably a push-button switch with protective structure to prevent accidental contact, and is used to control the on / off of test circuit.

[0084] The LCD digital display ohmmeter 1 is integrated on the surface of the insulating handle 6 and is used to display the resistance value between the two points being measured in real time.

[0085] The light-emitting diode 2 is preferably a violet light-emitting diode (high visibility), integrated on the surface of the insulating handle 6, to provide a light indication of the conduction status.

[0086] The probe 7 is fixed to the front end of the insulating handle 6 and is used to directly contact the terminal of the solenoid valve cable under test.

[0087] The alligator clip test lead 5 is connected to the internal circuit of the insulated handle 6 via a wire. The alligator clip with the insulated handle is used to hold the other terminal of the solenoid valve cable under test.

[0088] The working method of the portable arc-extinguishing solenoid valve calibration device for nuclear power plants includes the following steps:

[0089] S1. Clamp the alligator clip test cable 5 to one terminal of the solenoid valve test cable;

[0090] S2. Contact the probe 7 with the other terminal of the solenoid valve cable under test;

[0091] S3. Press the test switch 4;

[0092] S4. Observe the lighting status of the LED 2 and the display value of the LCD digital display resistance meter 1;

[0093] 5. If the LED 2 is lit and the LCD digital resistance meter 1 displays a resistance value close to 0Ω, then the terminal contacted by the probe 7 is the positive terminal of the solenoid valve coil; if the LED 2 is not lit and the LCD digital resistance meter 1 displays a resistance value much greater than 0Ω (usually an open circuit or coil resistance value), then the terminal contacted by the probe 7 is the negative terminal of the solenoid valve coil.

[0094] The working principle and usage method of the portable arc-extinguishing solenoid valve calibration device for nuclear power plants include:

[0095] 1. Clamp the alligator clip test lead 5 onto one terminal (terminal A) of the solenoid valve test cable.

[0096] 2. Place the tip of probe 7 into the other terminal (terminal B) of the solenoid valve cable under test.

[0097] 3. Press the test switch 4.

[0098] 4. Judgment:

[0099] Case 1 (Probe connected to positive terminal): If terminal B is the positive (+) terminal of solenoid valve coil 801 and terminal A is the negative (-) terminal of solenoid valve coil 801, the current path is: battery pack 3 positive terminal → LED 2 → LCD digital display ohmmeter 1 → test switch 4 → probe 7 → terminal B → solenoid valve coil 801 positive (+) → solenoid valve coil 801 → solenoid valve coil 801 negative (-) → terminal A → alligator clip test lead 5 → battery pack 3 negative terminal. In this circuit, LED 2 receives a positive voltage and lights up. Simultaneously, the LCD digital display ohmmeter 1 measures the resistance between probe 7 and alligator clip test lead 5. Since the probe 7 is directly connected to the positive (+) terminal of the solenoid valve coil 801 through point contact, and the alligator clip test lead 5 is clamped to the negative (-) terminal of the solenoid valve coil 801, and the resistance of the solenoid valve coil 801 itself is very small (usually much less than 1Ω), the LCD digital display resistance meter 1 will show a low resistance value close to 0Ω (actually the DC resistance of the solenoid valve coil 801).

[0100] Scenario 2 (Probe connected to negative terminal): If terminal B is the negative terminal (-) of solenoid valve coil 801, and terminal A is the positive terminal (+) of solenoid valve coil 801, the attempted current path is: Battery pack 3 positive terminal 4, LED 2 → LCD digital display ohmmeter 1 → Test switch 4 → Probe 7 → Terminal B → Solenoid valve coil 801 negative terminal (-) → Solenoid valve coil 801 → Solenoid valve coil 801 positive terminal (+) → Terminal A → Alligator clip test lead 5 → Battery pack 3 negative terminal. In this path, LED 2 requires current to flow from probe 7 (connected to negative terminal), which violates the unidirectional conductivity of LEDs, therefore LED 2 will not light up. Simultaneously, the LCD digital display ohmmeter 1 measures the resistance between probe 7 (connected to negative terminal) and alligator clip test lead 5 (clamped to positive terminal). Due to the presence of the parallel arc-extinguishing diode 802 (whose positive terminal is connected to the negative terminal (-) of the solenoid valve coil 801, and its negative terminal is connected to the positive terminal (+) of the solenoid valve coil 801), when the probe 7 is connected to the negative terminal and the alligator clip is connected to the positive terminal, the arc-extinguishing diode 802 is in a reverse cutoff state. Therefore, the LCD digital display ohmmeter 1 will display a high resistance value or an open circuit state (displaying "OL" or a very large resistance value, much larger than the resistance of the solenoid valve coil 801).

[0101] Conclusion: After pressing the test switch,

[0102] 2. If LED 2 is lit and the LCD digital display resistance meter 1 shows a resistance value close to 0Ω, then the terminal B contacted by probe 7 is the positive (+) terminal of solenoid valve coil 801.

[0103] If LED 2 does not light up and LCD digital display resistance meter 1 shows a high resistance value / open circuit, then the terminal B that the probe 7 contacts is the negative (-) terminal of the solenoid valve coil 801.

[0104] Example 2

[0105] This embodiment provides a portable arc-extinguishing solenoid valve calibration device for nuclear power plants. Based on Embodiment 1, the device in this embodiment further includes the following features:

[0106] The test switch 4 is a push-button switch with a protective structure to prevent accidental touches.

[0107] The protective structure is a push-button switch protective cover (using commercially available or purchased components).

[0108] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A portable arc-extinguishing solenoid valve calibration device for nuclear power plants, characterized in that, The device includes an insulated handle (6), a battery pack (3), a test switch (4), an LCD digital display resistance meter (1), a light-emitting diode (2), a probe (7), and an alligator clip test lead (5); The battery pack (3) is disposed inside the insulating handle (6); The test switch (4), LCD digital display resistance meter (1) and light-emitting diode (2) are all disposed on the surface of the insulating handle (6); The probe (7) and the alligator clip test line (5) are both located outside the insulating handle (6); The alligator clip test lead (5) is electrically connected to the negative terminal of the battery pack (3) and the input terminal of the LCD digital display resistance meter (1); The output terminal of the LCD digital display resistance meter (1) is electrically connected to the probe (7); The positive terminal of the battery pack (3) is connected in series with the test switch (4) and the light-emitting diode (2), and then electrically connected to the probe (7).

2. The portable arc-extinguishing solenoid valve calibration device for nuclear power plants according to claim 1, characterized in that, The probe (7) and the alligator clip test line (5) are respectively located at both ends of the insulating handle (6).

3. The portable arc-extinguishing solenoid valve calibration device for nuclear power plants according to claim 1, characterized in that, The insulating handle body (6) is a shell made of ABS engineering plastic injection molding.

4. The portable arc-extinguishing solenoid valve calibration device for nuclear power plants according to claim 1, characterized in that, The battery pack (3) is a DC battery pack with an output voltage of 4.5V; The light-emitting diode (2) is a violet light-emitting diode.

5. A portable arc-extinguishing solenoid valve calibration device for nuclear power plants according to claim 1, characterized in that, The test switch (4) is an anti-accidental touch button switch.

6. A portable arc-extinguishing solenoid valve calibration device for nuclear power plants according to claim 5, characterized in that, The test switch (4) is a push-button switch with a protective structure to prevent accidental touches; The protective structure is a push-button switch protective cover.

7. A portable arc-extinguishing solenoid valve calibration device for nuclear power plants according to claim 1, characterized in that, The device is used for calibrating portable arc-extinguishing solenoid valves. The portable arc-extinguishing solenoid valve includes a solenoid valve coil (801) and an arc-extinguishing diode (802) connected in parallel with the solenoid valve coil (801); The portable arc-extinguishing solenoid valve also includes two terminals.

8. A portable arc-extinguishing solenoid valve calibration device for nuclear power plants according to claim 7, characterized in that, The range of the LCD digital display resistance meter (1) includes 0Ω to the typical resistance range of the solenoid valve coil.

9. A portable arc-extinguishing solenoid valve calibration device for nuclear power plants according to claim 7, characterized in that, The alligator clip test line (5) is used to clamp onto one terminal of the portable arc-extinguishing solenoid valve; The probe (7) is used to contact another terminal of the portable arc-extinguishing solenoid valve.

10. A portable arc-extinguishing solenoid valve calibration device for nuclear power plants according to claim 7, characterized in that, The two terminals are the positive terminal and the negative terminal of the solenoid valve coil, respectively.

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