Universal sulfur hexafluoride leakage alarm calibration device

Abstract

The utility model discloses a universal sulfur hexafluoride leakage alarm calibration device, belongs to the technical field of sulfur hexafluoride gas detection, and aims to overcome the defect that many different devices need to be adopted for calibration of existing different sulfur hexafluoride alarm devices. The calibration device comprises a shell and a calibration inner container installed in the shell, the calibration inner container is provided with an opening, a sealing cover is installed at the opening, the shell is provided with an air inlet connector, an air outlet connector, a pump suction connector and a leakage hole, and a four-way valve is arranged in the shell so that the calibration inner container can be communicated with one of the pump suction connector, the leakage hole and the calibration inner container. Through the innovative design of a physical sealing structure and multi-channel control logic, the core problems of poor sealing performance, serious pollution, large environmental interference and the like in a traditional verification mode are solved, meanwhile, universal verification that one device is compatible with multiple devices is achieved, and the safety, the environmental protection performance and the accuracy of verification of the sulfur hexafluoride detection equipment are remarkably improved.

Description

Technical Field

[0001] This utility model belongs to the field of sulfur hexafluoride gas detection technology, and relates to a general-purpose sulfur hexafluoride leak alarm calibration device. Background Technology

[0002] To ensure the safe operation of sulfur hexafluoride (SF6) electrical equipment, monitor the environmental conditions of the gas charging equipment, and better protect the personal safety of operation and maintenance personnel, SF6 detection and alarm devices for detecting, leaking, and alarming SF6 gas concentrations are widely used in power systems. Common SF6 leak alarm devices include handheld leak detectors, online monitoring and alarm devices fixed to the bottom of indoor GIS systems, and infrared imaging leak detectors. The traditional calibration method for handheld leak detectors involves placing the probe into a collection bag filled with standard SF6 gas and then comparing the instrument reading with the standard value. Online monitoring and alarm devices that display concentration values ​​typically use a wrapping method: the online monitoring device is wrapped with soft rubber cloth, standard SF6 gas is introduced, and the reading is compared with the standard value after stabilization. The disadvantages of these two calibration methods are that gas exchange with the outside environment is unavoidable, and the airtightness cannot be guaranteed. Furthermore, the exhaust gas is directly discharged after each test, posing a personal hazard to the experimenters and being environmentally unfriendly. Infrared imaging leak detectors require controlling the gas leakage flow rate, which necessitates the use of a gas mixing instrument to prepare the concentration before outputting it to the leak hole. However, the ambient temperature is difficult to control during the test, affecting the calibration results. Summary of the Invention

[0003] This invention addresses the problems existing in the prior art by proposing a universal sulfur hexafluoride leakage alarm calibration device, aiming to overcome the defect that the calibration of different sulfur hexafluoride alarm devices requires the use of many different devices.

[0004] This utility model is implemented as follows:

[0005] A general-purpose sulfur hexafluoride leak alarm calibration device is characterized in that it includes a housing and a calibration liner installed inside the housing. The calibration liner has an opening and a sealing cap is installed at the opening. The housing is provided with an air inlet, an air outlet, a pump suction interface and a leak hole. A four-way valve is provided inside the housing to connect the calibration liner with one of the pump suction interface, the leak hole and the calibration liner.

[0006] A flow meter is installed on the pipeline between the air intake port and the calibration liner.

[0007] The housing is provided with a first communication interface for connecting to an external display, and the calibration liner is provided with a second communication interface for connecting to the alarm device to be calibrated in the calibration liner. The first communication interface and the second communication interface are connected by a communication cable.

[0008] The sealing cap is a transparent cap.

[0009] The housing is equipped with a temperature control switch, a temperature regulator and an electronic display screen. The calibration liner is equipped with a temperature sensor, and the electronic display screen is connected to the temperature sensor to display the temperature of the calibration liner.

[0010] An adjusting needle valve is provided on the pipeline between the leak and the four-way valve to control the amount of gas leakage.

[0011] The air inlet, air outlet, and pump suction interface are all self-locking female connectors that can be quickly detached.

[0012] The calibration liner has an air inlet and an air outlet, with the air inlet positioned lower than the air outlet.

[0013] The calibration liner has fixing feet, which are fixed to the housing by screws.

[0014] The present invention has the following beneficial effects: Through the innovative design of physical sealing structure and multi-path control logic, it solves the core problems of poor sealing, serious pollution and large environmental interference in traditional verification methods. At the same time, it realizes universal verification of one type of device compatible with multiple devices, which significantly improves the safety, environmental protection and accuracy of sulfur hexafluoride detection equipment verification. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the first angle structure of the calibration device;

[0016] Figure 2 This is a schematic diagram of the second angle structure of the calibration device;

[0017] Figure 3 This is a schematic diagram of the third angle structure of the calibration device;

[0018] Figure 4 This is a schematic diagram of the fourth angle structure of the calibration device;

[0019] Figure 5 This is a schematic diagram of the structure for calibrating the inner liner.

[0020] Figure labeling: 100, housing; 110, air inlet; 111, flow meter; 120, air outlet; 130, pump suction interface; 140, leak hole; 141, regulating needle valve; 150, four-way valve; 160, first communication interface; 170, temperature control switch; 171, temperature regulator; 172, electronic display screen; 200, calibration inner liner; 210, sealing cover; 220, air inlet; 230, air outlet; 240, fixing foot. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, so as to make the technical solution of this utility model easier to understand and master. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0022] This embodiment provides a calibration device for calibrating a sulfur hexafluoride detection alarm, such as... Figure 1-5 As shown, the calibration device includes a housing 100 and a calibration liner 200 installed inside the housing 100. The calibration liner 200 has an opening, and a sealing cap 210 is installed at the opening. The housing 100 is provided with an air inlet 110, an air outlet 120, a pump suction inlet 130, and a drain hole 140. A four-way valve 150 is provided inside the housing 100 to allow the calibration liner 200 to communicate with one of the pump suction inlet 130, the drain hole 140, and the calibration liner 200. All piping connections between components use polytetrafluoroethylene (PTFE) tubing. The housing 100 is made of aluminum alloy with a powder-coated surface.

[0023] Sulfur hexafluoride (SF6) detection and alarm devices include handheld leak detectors, online monitoring and alarm devices, and infrared imaging leak detectors.

[0024] When calibrating the handheld leak detector and online monitoring alarm device, the sulfur hexafluoride (SF6) detector needs to be placed in the calibration chamber 200. Connect an external vacuum pump to the pump suction port 130, and adjust the four-way valve 150 to connect the pump suction port 130 to the calibration chamber 200. Vacuum the calibration chamber 200 using the vacuum pump, and adjust the four-way valve 150 to connect the calibration chamber 200 to itself. Connect an external standard gas cylinder containing standard SF6 to the gas inlet port 110 to supply standard gas to the calibration chamber 200. When the SF6 concentration in the calibration chamber reaches the preset value, observe whether the SF6 detector alarms, and calibrate the SF6 detector based on the result. Connect the exhaust port 120 to the exhaust gas recovery device to recover unwanted SF6.

[0025] When calibrating the infrared imaging leak detector, it is not necessary to place the sulfur hexafluoride (SF6) detector alarm into the calibration chamber 200. Connect the external vacuum pump to the pump suction port 130, and adjust the four-way valve 150 to connect the pump suction port 130 with the calibration chamber 200. Vacuum the calibration chamber 200 using the vacuum pump, and adjust the four-way valve 150 to connect the calibration chamber 200 to itself. Connect the external standard gas cylinder containing standard SF6 to the gas inlet port 110 to supply standard gas to the calibration chamber 200. When the standard gas in the calibration chamber 200 reaches the preset amount, adjust the four-way valve 150 to connect the calibration chamber 200 to the leak hole. The infrared imaging leak detector detects the SF6 at the leak hole. If it can be detected, the infrared imaging leak detector is normal; otherwise, calibrate the infrared imaging leak detector.

[0026] This single device is compatible with the calibration of three types of equipment: handheld leak detectors, online monitoring and alarm devices, and infrared imaging leak detectors. For handheld leak detectors and online monitoring and alarm devices, concentration detection and calibration are performed by placing the instrument inside the calibration chamber 200. For infrared imaging leak detectors, detection and calibration are performed by simulating leaks through pores. This eliminates the need for separate calibration equipment for different instruments, reducing calibration costs and equipment management complexity. The exhaust port 120 connects to a tail gas recovery device, allowing waste gas generated during calibration to be recovered, preventing direct emissions of sulfur hexafluoride that could pollute the environment and harm laboratory personnel, thus adhering to green environmental protection principles and ensuring experimental safety. The closed calibration chamber 200 isolates external environmental factors, and combined with precisely controlled standard gas concentrations and leak simulations, ensures stable calibration conditions, making the calibration results more accurate and reliable.

[0027] like Figure 1 , 2 As shown, a flow meter 111 is installed on the pipeline between the air inlet 110 and the calibration inner liner 200. The introduction of the flow meter 111 allows the standard gas concentration inside the calibration inner liner 200 to be precisely set and controlled. For handheld leak detectors and online monitoring alarm devices that are sensitive to concentration, it can more accurately simulate gas concentration changes in the actual working environment, improving the calibration accuracy of the instrument's concentration detection function. When calibrating an infrared imaging leak detector, by controlling the air intake in conjunction with the leak hole 140, different leakage flow scenarios can be simulated more accurately. The real-time flow data provided by the flow meter 111 helps the operator adjust the air intake speed and the opening of the leak hole 140, achieving quantitative control of the leakage flow, meeting the calibration requirements of the infrared imaging leak detector under different leakage conditions, and improving the comprehensiveness and accuracy of the calibration.

[0028] like Figure 1 , 2 As shown, the housing 100 is provided with a first communication interface 160 for connecting to an external display, and the calibration liner 200 is provided with a second communication interface for connecting to a sulfur hexafluoride (SF6) detector / alarm within the calibration liner 200. The first communication interface 160 and the second communication interface are connected via a communication cable. By connecting the SF6 detector / alarm to be calibrated to the external display via the first communication interface 160, the operator can read the indicated values ​​without directly viewing the display interface of the instrument being calibrated. All detection data from the SF6 detector / alarm, including concentration values ​​and alarm signal trigger status, can be obtained in real time through the external display, significantly improving the convenience and intuitiveness of data viewing and facilitating rapid analysis of calibration results.

[0029] Furthermore, the sealing cover 210 is a transparent cover made of transparent acrylic material. When the calibration results are abnormal, the transparent sealing cover 210 can serve as a tool for initial troubleshooting. Operators can directly observe the inside of the inner tank to determine whether there are problems such as instrument malfunction, pipeline blockage, or seal failure, providing a direct basis for subsequent maintenance and adjustment and shortening troubleshooting time. In the absence of an external display, the data displayed by the sulfur hexafluoride detector alarm itself can also be observed through the sealing cover 210.

[0030] like Figure 1 , 2 As shown, the housing 100 is equipped with a temperature control switch 170, a temperature regulator 171, and an electronic display screen 172. The calibration liner 200 is equipped with a temperature sensor, and the electronic display screen 172 is connected to the temperature sensor to display the temperature of the calibration liner 200. The temperature regulator 171 can be manually adjusted to set the temperature, automatically heating or cooling, so that the temperature inside the calibration liner 200 meets 23±5℃. The calibration liner 200 is equipped with a sulfur hexafluoride concentration sensor, which is connected to the electronic display screen 172, which can display the standard gas concentration value inside the calibration liner 200 in real time.

[0031] like Figure 3 , 4 As shown, a regulating needle valve 141 is provided on the pipeline between the leak 140 and the four-way valve 150 to control the gas leakage rate. This system can simulate different levels of gas leakage scenarios, from trace to large amounts, meeting the calibration requirements of various sulfur hexafluoride (SF6) detectors and alarms under different leakage conditions. Operators can flexibly set gas leakage parameters according to actual needs, creating diverse custom calibration scenarios. For example, simulating a slow leakage scenario during normal equipment operation, or a rapid, large-scale leakage scenario during a sudden malfunction, makes the calibration process closer to the actual equipment operating conditions, effectively assessing the reliability of the calibrated instrument in complex environments.

[0032] Furthermore, the air inlet 110, air outlet 120, and pump suction interface 130 are all quick-release self-locking female connectors. These self-locking female connectors can complete connection or disassembly operations within seconds, significantly reducing equipment installation and debugging time. In calibration scenarios involving frequent changes to external equipment, operators do not need to spend a significant amount of time tightening or loosening connectors, significantly improving work efficiency.

[0033] like Figure 5As shown, the calibration liner 200 has an air inlet 220 and an air outlet 230, with the air inlet 220 positioned lower than the air outlet 230. Sulfur hexafluoride gas has a density approximately five times that of air and is classified as a heavy gas. When standard sulfur hexafluoride gas is injected through the lower air inlet 220, it will naturally sink due to its own gravity and gradually fill the space of the calibration liner 200, forming a stable gas stratification. Compared to an equal-height layout of the air inlet 220 and air outlet 230, the lower air inlet avoids turbulence caused by convection during gas injection, ensuring that the gas fills the liner uniformly and quickly, reducing concentration gradient differences, and providing a more stable gas environment for calibration. The calibration liner 200 has fixing feet 240, which are fixed to the housing 100 by screws.

Claims

1. A universal sulfur hexafluoride leak alarm calibration device, characterized in that, The device includes a housing (100) and a calibration liner (200) installed inside the housing (100). The calibration liner (200) has an opening and a sealing cap (210) is installed at the opening. The housing (100) is provided with an air inlet (110), an air outlet (120), a pump suction port (130), and a drain hole (140). A four-way valve (150) is provided inside the housing (100) to allow the calibration liner (200) to communicate with one of the pump suction port (130), the drain hole (140), and the calibration liner (200).

2. The universal sulfur hexafluoride leak alarm calibration device according to claim 1, characterized in that, A flow meter (111) is installed on the pipeline between the air inlet (110) and the calibration liner (200).

3. The universal sulfur hexafluoride leak alarm calibration device according to claim 1, characterized in that, The housing (100) is provided with a first communication interface (160) for connecting to an external display, and the calibration liner (200) is provided with a second communication interface for connecting to the alarm device to be calibrated in the calibration liner (200). The first communication interface (160) and the second communication interface are connected by a communication cable.

4. The universal sulfur hexafluoride leak alarm calibration device according to claim 1, characterized in that, The sealing cap (210) is a transparent cap.

5. A universal sulfur hexafluoride leak alarm calibration device according to claim 1, characterized in that, The housing (100) is provided with a temperature control switch (170), a temperature regulator (171) and an electronic display screen (172). The calibration liner (200) is provided with a temperature sensor. The electronic display screen (172) is connected to the temperature sensor to display the temperature of the calibration liner (200).

6. A universal sulfur hexafluoride leak alarm calibration device according to claim 1, characterized in that, An adjusting needle valve (141) is provided on the pipeline between the leak (140) and the four-way valve (150) to control the amount of gas leakage.

7. A universal sulfur hexafluoride leak alarm calibration device according to claim 1, characterized in that, The air inlet (110), air outlet (120), and pump suction interface (130) are all self-locking female connectors that can be quickly detached.

8. A universal sulfur hexafluoride leak alarm calibration device according to claim 1, characterized in that, The calibration liner (200) has an air inlet (220) and an air outlet (230), with the air inlet (220) positioned lower than the air outlet (230).

9. A universal sulfur hexafluoride leak alarm calibration device according to claim 1, characterized in that, The calibration liner (200) has a fixing foot (240) which is fixed to the housing (100) by screws.

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