Civil air defense protection equipment leakproofness on-site detection equipment for simulating wartime working conditions

Abstract

The utility model discloses civil air defense protection equipment leakproofness on-site detection equipment for simulating wartime working conditions, which comprises a closed frame arranged on the periphery of the inner wall of a door frame wall, cover materials are adhered to two sides of the closed frame, and an electromagnetic vent valve is arranged on one side, close to a to-be-detected piece, of the closed frame through a reserved hole of the closed frame. A pressure measuring pipe and an exhaust pipe are installed on the other side, a digital micromanometer is installed on the pressure measuring pipe, and a gas mass flow meter, a control valve and a vacuum pump are sequentially installed on the exhaust pipe. Wartime working conditions are simulated, the sealing frame of the double-layer high-strength aluminum alloy structure and the vacuum pump are used for generating a negative pressure environment, the sealing performance of the protection equipment is accurately detected, and traditional positive pressure detection errors are avoided. Leakage points are accurately positioned through coloring aerosol leakage detection, and the maintenance efficiency is improved. Besides, the modular design enables the detection equipment to be wide in application range, can detect protective doors and hole sealing members of different specifications, is suitable for leakproofness detection of doors, windows and curtain walls, and meets diversified requirements.

Description

Technical Field

[0001] This utility model relates to the technical field of airtightness testing of protective equipment, specifically to an on-site testing device for the airtightness of civil defense protective equipment under simulated wartime conditions. Background Technology

[0002] In the field of civil defense engineering construction, the airtightness of protective equipment is of paramount importance, as it relates to the safety of personnel and materials within the fortifications during wartime and serves as a key line of defense against toxic and harmful gases from the outside. However, current technologies for testing the airtightness of civil defense protective equipment have significant shortcomings.

[0003] Existing testing equipment and methods mostly employ positive pressure testing, which involves filling the protective equipment with gas to create an internal pressure higher than the external pressure. The tightness is then assessed by observing changes in the pressure difference and any gas leakage. However, this is completely opposite to the actual wartime conditions where external toxic or harmful gases exert pressure greater than those inside the fortification, and external pressure attempts to penetrate. This discrepancy means that the test results cannot accurately reflect the performance of the protective equipment during wartime, making it difficult to accurately assess its actual protective capabilities.

[0004] Meanwhile, existing technologies have limitations in detecting leaks in protective equipment, making precise location difficult. When detection reveals that the protective equipment's airtightness is substandard, it is impossible to quickly and accurately pinpoint the specific leak point, resulting in low repair efficiency and difficulty in fundamentally solving the airtightness problem.

[0005] In addition, the existing testing equipment has a relatively narrow scope of application, and can only test small protective airtight doors, airtight doors, and suspended door panels. For larger openings, such as special opening sealing components in some large civil defense works, the existing equipment cannot effectively test them and cannot meet the diverse testing needs of civil defense projects. Utility Model Content

[0006] The purpose of this invention is to provide a device and method for on-site testing of the airtightness of civil defense protective equipment under simulated wartime conditions, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a field testing device for the airtightness of civil defense protective equipment simulating wartime conditions, comprising a test piece installed on the outside of an opening in a door frame wall, a sealing frame installed around the inner wall of the door frame wall with sealant, a cover material bonded to the left and right sides of the sealing frame with sealant, an electromagnetic vent valve installed on the side of the sealing frame near the test piece through a pre-reserved hole in the sealing frame, and a pressure measuring tube and an exhaust tube installed on the other side, one end of the electromagnetic vent valve, the pressure measuring tube and the exhaust tube penetrating the frame and extending into the inner cavity of the sealing frame;

[0008] A digital micromanometer is installed at the other end of the pressure measuring tube, and a gas mass flow meter, a first control valve, a second control valve, and a vacuum pump are sequentially installed at the other end of the gas extraction tube.

[0009] Preferably, the sealed frame includes a two-layer frame structure, each of which is composed of a side frame a, a middle frame b, and a corner frame c connected by a socket joint, and the two layers of frames are fixedly connected by a number of limiting rods d.

[0010] Preferably, the cover material is a PE film with a thickness of 1.2 mm, and the sealant is a silicone sealant.

[0011] Preferably, the electromagnetic ventilation valve, digital micromanometer, gas mass flow meter, first control valve, second control valve, and vacuum pump are all electrically connected to the controller.

[0012] Preferably, a digital micromanometer is also installed between the first control valve and the second control valve.

[0013] The present invention provides a device and method for on-site testing of the airtightness of civil defense protective equipment under simulated wartime conditions, which has the following advantages:

[0014] 1. This utility model simulates real-world working conditions for more accurate testing: The equipment simulates the negative pressure condition inside the fortification, where the external pressure is greater than the internal pressure during wartime. Its sealed frame structure is tightly connected to the door frame and wall, and a negative pressure environment is created by vacuum pumping. The sealed frame in this application adopts a double-layer structure, consisting of a high-strength aluminum alloy frame, middle frame, and corner frame connected by a socket joint, and then fixed with limiting rods. It can withstand negative pressure and has good sealing performance. During testing, the negative pressure environment, consistent with wartime conditions, allows for accurate detection of the actual sealing performance of the protective equipment, avoiding errors caused by traditional positive pressure testing and ensuring reliable test results.

[0015] 2. This utility model can accurately locate leak points, making maintenance more efficient: It has the function of accurately locating leak points. When a failure to meet the airtightness standard is detected, a colored aerosol is used for leak detection. At key locations such as the area around the component under test in contact with openings, the connection between the airtight frame and the door frame / wall, and the installation location of the electromagnetic vent valve, once a leak is detected, the color change of the aerosol can clearly identify the leak point. Detection personnel can quickly carry out targeted repairs, saving maintenance time and costs, and improving the maintenance efficiency and airtightness of protective equipment.

[0016] 3. This utility model has a wide range of applications and meets diverse needs: Adopting a modular design, it is applicable to a wide range of situations. The frame, middle frame, corner frames, and limiting rods of the airtight frame can be flexibly combined, enabling the testing of various specifications of protective equipment. The items to be tested can include protective airtight doors, airtight doors, and suspended door panels with widths of 700mm-7000mm and heights of 1600mm-4300mm, and can also test larger opening sealing components. Furthermore, this testing equipment and method can also be applied to the airtightness testing of doors, windows, and curtain walls, meeting the testing needs of different construction fields and demonstrating strong versatility. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the sealed frame of this utility model.

[0019] In the diagram: 1. Door frame wall, 2. Item to be tested, 3. Sealed frame, 3a. Frame, 3b. Middle frame, 3c. Corner frame, 3d. Limiting rod, 4. Electromagnetic vent valve, 5. Pressure measuring tube, 6. Extraction tube, 7. Digital micromanometer, 8. Gas mass flow meter, 9. First control valve, 10. Second control valve, 11. Vacuum pump. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-2This utility model provides a technical solution: a field testing device for the airtightness of civil defense protective equipment simulating wartime conditions, comprising a test piece 2 installed on the outside of an opening in a door frame wall 1. The inner wall of the door frame wall 1 is sealed with a sealing frame 3 around its perimeter using silicone sealant. The sealing frame 3 comprises a two-layer frame structure, each consisting of a side frame 3a, a middle frame 3b, and a corner frame 3c connected by a socket joint. The two frames are fixedly connected by several limiting rods 3d. The side frame 3a, middle frame 3b, corner frame 3c, and limiting rods 3d are all made of high-strength aluminum alloy. This material is not only lightweight, facilitating equipment handling and installation, but also has good corrosion resistance, adapting to different testing environments and extending the equipment's service life. The limiting rods 3d are evenly distributed between the two frames, and their number and length are rationally designed according to the size of the sealing frame 3. For smaller sealing frames, the number of limiting rods is relatively small, while larger sealing frames require more limiting rods to ensure the relative position between the two frames is fixed.

[0022] The left and right sides of the sealed frame 3 are respectively bonded with a cover material using silicone sealant. The cover material is a 1.2mm thick PE film, which has good flexibility and sealing properties, effectively preventing gas leakage. The silicone sealant is neutral and has excellent adhesion and weather resistance, forming a stable and durable sealing connection to ensure the airtightness of the sealed frame 3. An electromagnetic vent valve 4 is installed on the side of the sealed frame 3 closest to the test piece 2 through a pre-drilled hole in the sealed frame, and a pressure measuring tube 5 and a suction tube 6 are installed on the other side. One end of the electromagnetic vent valve 4, pressure measuring tube 5, and suction tube 6 penetrates the frame and extends into the inner cavity of the sealed frame 3.

[0023] The other end of the pressure measuring tube 5 is equipped with a digital micro-manometer 7, and the other end of the gas extraction tube 6 is sequentially equipped with a gas mass flow meter 8, a first control valve 9, a second control valve 10, and a vacuum pump 11.

[0024] The electromagnetic vent valve 4, digital micro-manometer 7, gas mass flow meter 8, first control valve 9, second control valve 10 and vacuum pump 11 are all electrically connected to the controller. The electrical connection wire of the electromagnetic vent valve 4 passes through the hole for installing the pressure measuring tube 5 and the suction tube 6 and exits the frame body, and is connected to the external power supply of the frame body.

[0025] A digital micromanometer is also installed between the first control valve 9 and the second control valve 10, which facilitates real-time monitoring of pressure changes in the pipeline when the gas mass flow meter detects the gas flow rate. The detailed connection method is well-known in the art; the following mainly describes the working principle and process:

[0026] Preparation and Assembly of the Sealing Frame Before S1 Testing: Inspect the appearance of the component to be tested, carefully checking its integrity for any damage or deformation; check its straightness to ensure there are no obvious bends or dents; simultaneously, carefully examine the integrity and surface condition of the sealing rubber strip of the component to be tested. If there are signs of wear, breakage, or aging, record or address them promptly to avoid affecting the test results. Wipe the walls around the opening where the sealing frame will be installed with acetone. Acetone has good dissolving properties and can effectively remove dust, oil, and other impurities from these areas, allowing the subsequently applied silicone sealant to adhere better and ensuring a good seal.

[0027] S2 Sealing Installation of the Sealing Frame: Assemble the frame, middle frame, corner frames, and limit rods using a socket-type connection. During the connection process, ensure that all components are accurately aligned and tightly connected. If necessary, use tools to assist in the installation, ensuring that the sealing frame forms a stable frame structure. Apply silicone sealant evenly to the inside wall, top, and bottom of the door frame and wall opening after assembly. When installing the sealing frame, ensure that the sealant layer is of uniform thickness, avoiding air bubbles or gaps, and ensuring a good seal between the sealing frame and the door frame / wall.

[0028] S3 Installation and Testing Accessories: Install the electromagnetic vent valve through the pre-drilled hole in the sealed frame on the side closest to the part to be tested, and install the pressure testing tube and the extraction tube on the other side. During installation, pay attention to the secure connection of each component to ensure that the electromagnetic vent valve can open and close normally, and that the pressure testing tube and the extraction tube are tightly connected without any risk of leakage.

[0029] S4 Installation Cover Material: Apply silicone sealant evenly to both sides of the sealed frame and firmly bond a 1.2mm PE film; when bonding, try to smooth the film as much as possible to avoid wrinkles, ensure the sealing effect between the film and the sealed frame, and form a closed vacuum testing space.

[0030] S5 Connecting the Testing Equipment: Connect the pressure measuring tube to the digital micromanometer via the quick-connect tubing, and simultaneously connect the extraction tube to the gas mass flow meter, the first control valve, the second control valve, and the vacuum pump in sequence; ensure a tight and leak-free connection so that the entire testing system forms a complete circuit.

[0031] S6 Sealing Frame Sealing Test: Close the component to be tested, ensuring it is closed and sealed, thus putting the entire device into test preparation mode. At this point, recheck the connections of each component and the initial state of the equipment. Once confirmed to be correct, proceed to the next test.

[0032] Open the first and second control valves, start the vacuum pump to evacuate air, and then close the first and second control valves. Within the standard waiting time, use the fluctuation of the detection value of the digital micro-manometer 7 to determine whether the airtightness meets the standard requirements. The standards mentioned in this article refer to the "Experimental Testing and Quality Inspection Standards for Protective Equipment of Civil Air Defense Engineering" RFJ04-2009 and the "Provisional Standards for Product and Installation Quality Inspection of Protective Equipment of Civil Air Defense Engineering" RFJ003-2021. For example, if the pressure change is specified to not exceed a certain value, such as ±5Pa, within a certain time period, if the actual pressure change exceeds this range, it indicates that there may be a leak in the vacuum chamber. If the airtightness of the vacuum chamber does not meet the standard requirements, use a colored aerosol to detect leaks. Spray the colored aerosol at the connection between the sealing frame and the wall. Once a leak is found that causes the aerosol to change color, the leak point is located. Immediately seal the leak with sealant or replace the sealing components until the airtightness of the sealing frame meets the standard requirements.

[0033] S7 Tightness test of the test piece: Open the solenoid vent valve, the first control valve and the second control valve, start the vacuum pump and continue to work until the pressure in the vacuum chamber reaches the standard requirements. After the target pressure is reached, close the two control valves and wait for the time required by the standard.

[0034] S8 Determine if the airtightness is qualified: After the waiting time is over, check the digital micro-manometer connected to the pressure measuring tube. If the pressure meets the standard requirements, the airtightness of the test piece is qualified; if the pressure drops, open the second control valve and start the vacuum pump, then open the first control valve. Calculate the leakage amount based on the gas flow meter reading. If the leakage amount meets the standard, the test is qualified; otherwise, use colored aerosol to detect the leak point and seal it.

[0035] S9 Re-inspection: After the sealing is completed, repeat the inspection according to steps S7 to S8 until the airtightness test is qualified.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A field testing device for the airtightness of civil defense protective equipment simulating wartime conditions, comprising a test piece (2) installed on the outside of an opening in a door frame wall (1), characterized in that: The inner wall of the door frame wall (1) is fitted with a sealed frame (3) by sealant. The left and right sides of the sealed frame (3) are respectively bonded with a cover material by sealant. The side of the sealed frame (3) close to the test piece (2) is fitted with an electromagnetic vent valve (4) through a reserved hole in the sealed frame. The other side is fitted with a pressure measuring tube (5) and an air extraction tube (6). One end of the electromagnetic vent valve (4), pressure measuring tube (5) and air extraction tube (6) passes through the frame and extends into the inner cavity of the sealed frame (3). The other end of the pressure measuring tube (5) is equipped with a digital micro pressure gauge (7), and the other end of the gas extraction tube (6) is equipped with a gas mass flow meter (8), a first control valve (9), a second control valve (10) and a vacuum pump (11) in sequence.

2. The on-site testing equipment for the airtightness of civil defense protective equipment simulating wartime conditions according to claim 1, characterized in that: The sealed frame (3) includes a two-layer frame structure, which is composed of a side frame (3a), a middle frame (3b) and a corner frame (3c) connected by a socket. The two frames are fixedly connected by a number of limiting rods (3d).

3. The on-site testing equipment for the airtightness of civil defense protective equipment simulating wartime conditions according to claim 1, characterized in that: The cover material is a PE film with a thickness of 1.2 mm, and the sealant is a silicone sealant.

4. The on-site testing equipment for the airtightness of civil defense protective equipment simulating wartime conditions according to claim 1, characterized in that: The electromagnetic ventilation valve (4), digital micromanometer (7), gas mass flow meter (8), first control valve (9), second control valve (10) and vacuum pump (11) are all electrically connected to the controller.

5. The on-site testing equipment for the airtightness of civil defense protective equipment simulating wartime conditions according to claim 1, characterized in that: A digital micromanometer is also installed between the first control valve (9) and the second control valve (10).

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