NBC shelter overpressure air tightness detection equipment

Abstract

The utility model relates to a kind of NBC shelter superpressure air tightness detection equipment, belong to detection equipment technical field, including high-pressure vortex fan, vortex flowmeter, sealing pipeline, internal thread reducing joint, differential pressure gauge;High-pressure vortex fan is used to input pressure gas to NBC shelter;The output of high-pressure vortex fan is connected with the one end of sealing pipeline, the other end of sealing pipeline is connected with the input end of internal thread reducing joint by connecting piece, the output end of internal thread reducing joint is connected with the port on NBC shelter;Differential pressure gauge is installed on NBC shelter, for detecting the pressure in NBC shelter, and obtains the differential pressure change rate with atmosphere to judge the sealing performance of NBC shelter;Vortex flowmeter is arranged on sealing pipeline, for real-time monitoring and measuring the gas flow through sealing pipeline, to assist in judging whether the measured NBC shelter exists leakage.The utility model structure is simple, and the air tightness of NBC shelter can be quickly debugged, tested in situ.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, specifically to an overpressure airtightness testing device for NBC container. Background Technology

[0002] As a key piece of equipment for nuclear, biological, and chemical (NBC) protection, the overpressure airtightness of NBC shelters directly affects the safety of personnel inside. According to relevant standards such as GJB 150.23A, NBC shelters must maintain airtightness under specific positive pressure conditions (such as +100Pa), and the leakage rate must not exceed the specified limit.

[0003] Currently, the overpressure airtightness commissioning and testing of NBC (Built-in-the-Shelf) shelters typically rely on external professional testing agencies. These agencies employ large-scale pressure-stabilized gas supply systems, high-precision micro-differential pressure sensors, and data acquisition devices to conduct overall shelter testing. This testing method requires transporting the shelter to a fixed testing site, connecting external gas supply pipelines and sealing interfaces during the testing process, and evaluating airtightness performance using pressure drop or flow compensation methods.

[0004] However, the container itself does not have a dedicated interface for airtightness self-testing, which means that after arriving at the test site, it is necessary to disassemble and reassemble the external air supply pipeline according to the actual working conditions to match the container itself, which is cumbersome and inconvenient. If the test fails and cannot be debugged on the test site, it must be returned to the factory for repair, and then returned to the fixed test site for retesting, which not only prolongs the testing cycle but also increases costs.

[0005] Therefore, there is an urgent need for a simple, readily available, and on-site airtightness testing device for NBC (Non-Body Surrounding) cabins to improve testing efficiency. Utility Model Content

[0006] To address the shortcomings of the existing technologies, this utility model provides an NBC container overpressure airtightness testing device, which is a simple airtightness testing device. It eliminates the need to go to a professional testing institution to use specialized equipment for each airtightness test, and can be tested repeatedly anytime and anywhere, which is both convenient and saves a lot of money.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] An overpressure airtightness testing device for NBC shelters includes a high-pressure vortex blower, a vortex flow meter, a sealed pipeline, an internal thread reducer, and a differential pressure gauge.

[0009] The high-pressure vortex blower is used to input pressurized gas at a predetermined pressure into the NBC container to be tested; the output port of the high-pressure vortex blower is connected to one end of the sealed pipeline, the other end of the sealed pipeline has a connector, the sealed pipeline is connected to the input end of the internal thread reducer through the connector, and the output end of the internal thread reducer is connected to the port on the NBC container.

[0010] The differential pressure gauge is installed on the NBC container to detect the pressure inside the NBC container and to obtain the rate of change of the pressure difference with the atmosphere to determine the sealing performance of the NBC container.

[0011] The vortex flow meter is installed on the sealed pipeline to monitor and measure the gas flow rate through the sealed pipeline in real time, and to help determine whether there is a leak in the NBC container being tested.

[0012] Furthermore, the sealed pipeline also includes a first connecting pipe, a reducing tee, a gate valve, a ball valve, a second connecting pipe, a welded pagoda joint, and a PVC dust extraction duct;

[0013] The output port of the high-pressure vortex blower is connected to the first port of the reducing tee through the first connecting pipe; the second port of the reducing tee is connected to the input port of the ball valve; and the third port of the reducing tee is equipped with the gate valve. The output port of the ball valve is connected to the input end of the vortex flow meter through the second connecting pipe.

[0014] The output end of the vortex flow meter is connected to one end of the PVC dust collection duct via the welded pagoda connector, and the other end of the PVC dust collection duct is connected to the connector.

[0015] Furthermore, the length of the second connecting pipe is 10 to 20 times the diameter of the vortex flow meter 15.

[0016] Furthermore, the sealed pipeline also includes a welded flange and a rubber plate;

[0017] The welding flange is welded and fixed at the output end of the second connecting pipe and the input end of the welding pagoda joint, respectively; the two ends of the vortex flow meter are respectively provided with connecting flanges; the two ends of the vortex flow meter are respectively fixedly connected to the welding flange by fasteners, and the rubber plate is provided between the connecting flange and the welding flange.

[0018] Furthermore, the thickness of the rubber sheet is 2-4 mm.

[0019] Furthermore, the sealing pipeline also includes a first external threaded connector and a second external threaded connector; the gate valve is threadedly connected to the third port of the reducing tee through the first external threaded connector; the second port of the reducing tee is coaxially threadedly connected to the input end of the ball valve through the second external threaded connector.

[0020] Furthermore, the sealed pipeline also includes clamps; both ends of the PVC dust extraction duct are connected to the output end of the welded pagoda connector and the input end of the connector, respectively, and are tightened by the clamps.

[0021] Furthermore, the connector includes a quick connector and a third external thread connector. The quick connector includes a male and a female connector that mate with each other. The male connector is connected to the output end of the PVC dust extraction duct, and the female connector is threadedly connected to the input end of the internal thread reducer connector through the third external thread connector.

[0022] Furthermore, the connector includes a type C quick connector, a type A quick connector, and a third external thread connector; the input end of the type C quick connector is connected to the PVC vacuum duct, and the output end of the type A quick connector is threadedly connected to the input end of the internal thread reducer via the third external thread connector; the type A quick connector is inserted into the output end of the type C quick connector via its input end and is connected to the type C quick connector.

[0023] Furthermore, the high-pressure end of the differential pressure gauge is installed on the upper part of the NBC container via a PVC hose, while the low-pressure end of the differential pressure gauge is connected to the atmosphere.

[0024] The beneficial effects of this utility model are:

[0025] This utility model discloses an overpressure airtightness testing device for NBC (Built-in-the-Sea) shelters. It has a simple structure and is easy to move. It can be quickly and repeatedly tested on-site anytime and anywhere, eliminating the need to go to a professional testing institution's fixed testing site and use specialized equipment for each airtightness test of the NBC shelter. The device can be transported to a professional testing institution for testing according to regulations after overall debugging is completed. This greatly reduces the debugging time and number of debugging sessions at professional testing institutions, saving a lot of testing time and reducing testing costs.

[0026] This invention utilizes a differential pressure gauge to determine the sealing performance of an NBC (Non-Compressive Burgar) chamber by measuring the rate of change of minute pressure differences, and employs a vortex flow meter to assist in determining whether leaks exist within the NBC chamber, achieving high testing accuracy. Furthermore, this embodiment incorporates a sufficiently long second connecting pipe at the front end of the vortex flow meter to ensure the stability of the gas flow rate entering the vortex flow meter. Additionally, rubber plates are installed at both ends of the vortex flow meter to prevent gas leakage at the flange interface.

[0027] When the port diameter of the NBC container changes, this utility model only requires replacing the internal thread reducer, saving time and effort. Furthermore, the sealing pipeline can be switched on and off via a quick connector, making disassembly and assembly convenient. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the NBC container overpressure airtightness testing device of this utility model.

[0029] Among them: 1-High-pressure vortex blower, 2-First connecting pipe, 3-Reducing tee, 4-First external threaded connector, 5-Gate valve, 6-Second external threaded connector, 7-Ball valve, 8-Second connecting pipe, 9-Welded flange, 10-Rubber plate, 11-Spring gasket, 12-Flat gasket, 13-Bolt, 14-Nut, 15-Vortex flow meter, 16-Welded pagoda connector, 17-Clamping clamp, 18-PVC dust extraction duct, 19-Quick connector type C, 20-Quick connector type A, 21-Third external threaded connector, 22-Internal threaded reducer, 23-Differential pressure gauge, 24-PVC hose, 25-NBC container. Detailed Implementation

[0030] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of this utility model.

[0031] The terms used in this application, such as top, bottom, left, right, inside, outside, front end, rear end, head, and tail, are based on the orientations or positional relationships shown in the accompanying drawings. Different drawings may result in different positional relationships, therefore they should not be construed as limiting the scope of protection.

[0032] In this utility model, the terms "installation," "connection," "interlocking," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a connection that allows communication, a direct connection, or an indirect connection through an intermediate medium. They can also refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0033] This embodiment describes an overpressure airtightness testing device for NBC (Non-Compressive Container) shelters, which is a simple testing device that can repeatedly test the overpressure airtightness of NBC shelters anytime and anywhere.

[0034] like Figure 1As shown, the airtightness testing equipment uses a high-pressure vortex blower 1 as the air source device, which is connected to the NBC container 25 through a sealed pipeline to deliver high-pressure gas to the NBC container 25 for airtightness testing. The high-pressure vortex blower 1 has a frequency converter, and the central control unit controls the speed of the high-pressure vortex blower 1 through the frequency converter. In this embodiment, the maximum positive pressure of the high-pressure vortex blower 1 is not less than 150 mbar, and the maximum negative pressure is not less than 150 mbar. For example, if a high-pressure vortex blower of model RT-H8375BS is used, its power is 7.5 kW and its maximum air volume is 900 m³ / h. 3 / h, maximum positive pressure 180mbar, maximum negative pressure 210mbar, frequency 50Hz.

[0035] The high-pressure end of the differential pressure gauge 23 is installed on the upper part of the NBC container 25 via a PVC hose 24 and is connected to the interior of the NBC container 25. The low-pressure end of the differential pressure gauge 23 is connected to the atmosphere. Based on the relationship between pressure change and leakage, the differential pressure gauge 23 judges the sealing performance of the NBC container 25 by measuring the rate of change of small pressure difference between the NBC container 25 and its surrounding environment. When the rate of change of pressure difference exceeds a threshold, the central control unit adjusts the speed of the high-pressure vortex blower 1 via a frequency converter to automatically replenish air to the NBC container 25, realizing closed-loop control. The differential pressure gauge 23 can be selected with a range of ±2500Pa.

[0036] In this embodiment, a vortex flow meter 15 is installed on the sealed pipeline. The vortex flow meter 15 is used to monitor and measure the gas flow rate through the sealed pipeline in real time, thereby assisting in determining whether there is a leak in the NBC container 25 being tested. The vortex flow meter 15 in this embodiment has connecting flanges at both ends for connection to the sealed pipeline. The vortex flow meter 15 in this embodiment is a smart enhanced type (LUGB-SUP) vortex flow meter to enable high-precision flow monitoring for the airtightness detection of the NBC container 25.

[0037] Between the high-pressure vortex blower 1 and the vortex flow meter 15, the sealed pipeline includes a first connecting pipe 2, a reducing tee 3, a first external threaded joint 4, a gate valve 5, a second external threaded joint 6, a ball valve 7, a second connecting pipe 8, a welded flange 9, and a rubber plate 10.

[0038] The two ends of the first connecting pipe 2 are coaxially threaded to the output port of the high-pressure vortex blower 1 and the first port of the reducing tee 3, respectively. The second port of the reducing tee 3 is coaxially threaded to the input end of the ball valve 7 through the second external threaded connector 6. The small port (i.e., the third port) of the reducing tee 3 is threaded to the gate valve 5 through the first external threaded connector 4. The gate valve 5 is used to control the opening and closing of the sealed pipeline, and the ball valve 7 is used to regulate the gas flow rate in the sealed pipeline. The input end of the second connecting pipe 8 is coaxially threaded to the output port of the ball valve 7. The output end of the second connecting pipe 8 is coaxially welded and fixed to the welding flange 9. The welding flange 9 is fixedly connected to the connecting flange of the input end of the vortex flow meter 15 through bolts 13, nuts 14, spring washers 11, and flat washers 12. A rubber plate 10 is provided between the connecting flange and the welding flange 9. The rubber plate 10 can prevent gas from leaking from the interface between the connecting flange and the welding flange 9 to ensure the sealing at the interface between the connecting flange and the welding flange 9, and can also play a shock-absorbing role to reduce the impact of vibration on the vortex flow meter 15.

[0039] Preferably, the length of the second connecting pipe 8 is 10 to 20 times the diameter of the vortex flow meter 15, which can ensure the stability of the gas flow rate entering the vortex flow meter 15. The thickness of the rubber sheet 10 is 2 to 4 mm.

[0040] The sealing pipeline between the vortex flow meter 15 and the NBC container 25 includes a welded flange 9, a rubber plate 10, a welded pagoda joint 16, a clamp 17, a PVC dust extraction duct 18, a quick coupling type C 19, a quick coupling type A 20, a third external thread joint 21, and an internal thread reducing joint 22.

[0041] The connecting flange at the output end of the vortex flowmeter 15 is fixedly connected to the welding flange 9, which is coaxially fixed to the input end of the welding pagoda connector 16, by bolts 13, nuts 14, spring washers 11, and flat washers 12. A rubber plate 10 is also provided between the connecting flange and the welding flange 9. The two ends of the PVC dust extraction duct 18 are connected to the output end of the welding pagoda connector 16 and the input end of the quick connector C type 19, respectively, and are tightened by clamps 17. The output end of the quick connector A type 20 is threadedly connected to the input end of the internal thread reducer 22 through the third external thread connector 21. When preparing to test the airtightness of the NBC cabin 25, the input end of the quick connector A type 20 is inserted into the output end of the quick connector C type 19 and tightly connected to the quick connector C type 19. The output end of the internal thread reducer 22 is connected to the port on the NBC cabin 25 to achieve the connection between the sealed pipeline and the NBC cabin 25. The internal thread reducer 22 is selected according to the port diameter to be connected on the NBC shelter 25, that is, the output port diameter of the internal thread reducer 22 matches the port diameter.

[0042] Alternatively, in another embodiment, the airtightness testing device includes a quick connector comprising a mating male and female connector. The male connector is connected to the output end of the PVC suction duct 18, and the female connector is threadedly connected to the input end of an internal thread reducer 22 via a third external thread connector 21. The internal thread reducer 22 is connected to the port of the NBC container 25. When the male connector of the quick connector is inserted into the female connector, the sealing pipeline is connected to the NBC container 25.

[0043] In addition, the airtightness testing equipment in this example can be mounted on a mobile trolley via a support base. During use, the airtightness testing equipment is pushed to the side of the NBC container 25 with the connection port. First, a suitable internal thread reducer 22 is selected and connected to the NBC container 25. Then, quick connectors C-type 19 and A-type 20 are quickly connected. The high-pressure end of the differential pressure gauge 23 is installed on the upper part of the NBC container 25 via a PVC hose 24. The high-pressure vortex blower 1 is set with the relevant parameters according to the testing requirements. After completing the test preparation, the gate valve 5 and ball valve 7 are opened to open the sealed pipeline. The high-pressure vortex blower 1 is started, and pressurized gas of a specific pressure value is injected into the NBC container 25 through the internal thread reducer 22. Once the pressure in the NBC container 25 reaches the preset pressure, the airtightness testing equipment enters a pressure-holding state for a predetermined time. During the pressure holding period, the high-pressure vortex blower 1 automatically adjusts its speed, and the differential pressure gauge 23 monitors the pressure inside the chamber in real time. The measured pressure is compared with atmospheric pressure to obtain the pressure difference value, which is then displayed. If the pressure difference value exceeds a threshold, it indicates a leak in the NBC container 25; otherwise, it indicates no leak and good airtightness. The central control unit controls the high-pressure vortex blower 1 to automatically adjust its speed based on the rate of change of the pressure difference, achieving automatic gas replenishment. During gas replenishment, the vortex flow meter 15 displays the gas flow rate, which is the leakage amount.

[0044] Although the principles of this utility model have been described in detail above with reference to preferred embodiments, those skilled in the art should understand that the above embodiments are merely illustrative explanations of the implementation of this utility model and are not intended to limit the scope of this utility model. The details in the embodiments do not constitute a limitation on the scope of this utility model. Any obvious changes, such as equivalent transformations or simple substitutions, based on the technical solution of this utility model without departing from its spirit and scope fall within the protection scope of this utility model.

Claims

1. An overpressure airtightness testing device for NBC (Non-Compressive Container) shelters, characterized in that, The air tightness testing equipment includes a high-pressure vortex blower (1), a vortex flow meter (15), a sealed pipeline, an internal thread reducer (22), and a differential pressure gauge (23). The high-pressure vortex blower (1) is used to input pressurized gas at a predetermined pressure into the NBC container (25) to be tested; the output port of the high-pressure vortex blower (1) is connected to one end of the sealed pipeline, the other end of the sealed pipeline has a connector, the sealed pipeline is connected to the input end of the internal thread reducer (22) through the connector, and the output end of the internal thread reducer (22) is connected to the port on the NBC container (25); The differential pressure gauge (23) is installed on the NBC container (25) to detect the pressure inside the NBC container (25) and to obtain the rate of change of the pressure difference with the atmosphere to determine the sealing performance of the NBC container (25). The vortex flow meter (15) is installed on the sealed pipeline to monitor and measure the gas flow rate through the sealed pipeline in real time, and to help determine whether there is a leak in the NBC container (25) being tested.

2. The NBC container overpressure airtightness testing device according to claim 1, characterized in that, The sealed pipeline also includes a first connecting pipe (2), a reducing tee (3), a gate valve (5), a ball valve (7), a second connecting pipe (8), a welded pagoda joint (16), and a PVC dust extraction duct (18). The output port of the high-pressure vortex blower (1) is connected to the first port of the reducing tee (3) through the first connecting pipe (2), the second port of the reducing tee (3) is connected to the input port of the ball valve (7), and the third port of the reducing tee (3) is provided with the gate valve (5); the output port of the ball valve (7) is connected to the input end of the vortex flow meter (15) through the second connecting pipe (8); The output end of the vortex flow meter (15) is connected to one end of the PVC dust suction duct (18) through the welding pagoda connector (16), and the other end of the PVC dust suction duct (18) is connected to the connector.

3. The NBC container overpressure airtightness testing device according to claim 2, characterized in that, The length of the second connecting pipe (8) is 10 to 20 times the diameter of the vortex flow meter 15.

4. The NBC container overpressure airtightness testing device according to claim 2, characterized in that, The sealed pipeline also includes a welding flange (9) and a rubber plate (10). The welding flange (9) is welded and fixed at the output end of the second connecting pipe (8) and the input end of the welding pagoda joint (16); the two ends of the vortex flow meter (15) are respectively provided with connecting flanges; the two ends of the vortex flow meter (15) are respectively fixedly connected to the welding flange (9) by fasteners, and the rubber plate (10) is provided between the connecting flange and the welding flange (9).

5. The NBC container overpressure airtightness testing device according to claim 4, characterized in that, The thickness of the rubber sheet (10) is 2-4 mm.

6. The NBC container overpressure airtightness testing device according to claim 2, characterized in that, The sealing pipeline also includes a first external threaded connector (4) and a second external threaded connector (6); the gate valve (5) is threaded to the third port of the reducing tee (3) through the first external threaded connector (4); the second port of the reducing tee (3) is coaxially threaded to the input end of the ball valve (7) through the second external threaded connector (6).

7. The NBC shelter overpressure airtightness testing device according to claim 2, characterized in that, The sealed pipeline also includes a clamp (17); both ends of the PVC dust suction duct (18) are connected to the output end of the welded pagoda joint (16) and the input end of the connector, respectively, and are tightened by the clamp (17).

8. The NBC container overpressure airtightness testing device according to claim 2, characterized in that, The connector includes a quick connector and a third external thread connector (21). The quick connector includes a male and a female connector that mate with each other. The male connector is connected to the output end of the PVC dust extraction duct (18). The female connector is threadedly connected to the input end of the internal thread reducer connector (22) through the third external thread connector (21).

9. The NBC shelter overpressure airtightness testing device according to claim 2, characterized in that, The connectors include a quick connector type C (19), a quick connector type A (20), and a third external thread connector (21); the input end of the quick connector type C (19) is connected to the PVC dust extraction duct (18), and the output end of the quick connector type A (20) is threadedly connected to the input end of the internal thread reducer connector (22) through the third external thread connector (21); the quick connector type A (20) is inserted into the output end of the quick connector type C (19) through its input end and connected to the quick connector type C (19).

10. The NBC container overpressure airtightness testing device according to claim 1, characterized in that, The high-pressure end of the differential pressure gauge (23) is installed on the upper part of the NBC container (25) through a PVC hose (24), and the low-pressure end of the differential pressure gauge (23) is connected to the atmosphere.

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