Air tightness detection system for civil air defense equipment

Abstract

The present invention provides an air tightness detection system for civil air defense equipment, which relates to the field of air tightness detection. The present invention includes an air supply system for providing an air source to a sealed space, a detection system connected in series between the air supply system and the sealed space, for detecting the air pressure in the sealed space and the gas flow rate sent into the sealed space by the air supply system, and outputting an air pressure signal and a flow rate signal; a processing module, which is electrically connected to the detection system, for receiving the air pressure signal and the flow rate signal, and controlling the air supply amount of the air supply system based on the air pressure signal and the flow rate signal, so that the air pressure in the sealed space reaches a preset value. The cooperation of the air supply system and the detection system realizes the precise control of the air pressure in the sealed space, can quickly and accurately detect the performance of the civil air defense equipment, reduces the operation steps, simplifies the detection process, significantly improves the detection efficiency and quality consistency, and meets the needs of large-scale production and strict quality assurance.

Description

Technical Field

[0001] The present invention relates to the technical field of civil air defense engineering, and in particular to an air tightness detection system for civil air defense equipment. Background Art

[0002] Civil defense equipment includes civil defense doors, sealed doors and windows, and civil defense equipment. Civil defense equipment is a key device widely used in civil defense facilities such as air protection, civil defense projects, and underground fire water supply. Its main function is to isolate, cut off, switch or exhaust through rapid closure in an emergency to ensure the safe and effective operation of the protection system.

[0003] In emergency evacuation, drainage, fire fighting and other scenarios, civil air defense equipment, as an important part of civil air defense projects, has a key protective function. In addition, civil air defense equipment must have the ability to resist shock waves and maintain air tightness in a fully closed state to prevent the invasion of external biochemical gases and ensure the safety of the internal environment. Therefore, after production is completed, civil air defense equipment must be strictly tested for air tightness to verify whether its sealing performance meets quality standards, which is of great significance to the reliability of civil air defense equipment and the safety of civil air defense projects.

[0004] At present, traditional air tightness testing methods are relatively complicated and usually require the use of multiple equipment and steps, resulting in low testing efficiency and obstructed production processes, which is not conducive to large-scale production and quality assurance. Summary of the invention

[0005] In order to solve the problem of complex air tightness detection process of civil air defense equipment, the present application provides an air tightness detection system for civil air defense equipment.

[0006] The present application provides a civil air defense equipment air tightness detection system, which adopts the following technical solutions:

[0007] A civil air defense equipment air tightness detection system is used to detect the air tightness of civil air defense equipment, wherein the civil air defense equipment is sealed by a cover plate to form a sealed space, comprising:

[0008] An air supply system, used to provide an air source to the sealed space, wherein the air supply system is a variable frequency air supply control system;

[0009] A detection system, connected in series between the gas supply system and the sealed space, for detecting the air pressure in the sealed space and the gas flow rate sent into the sealed space by the gas supply system, and outputting an air pressure signal and a flow rate signal;

[0010] a processing module, electrically connected to the detection system, for receiving the air pressure signal and the flow rate signal, and controlling the air supply of the air supply system based on the air pressure signal and the flow rate signal, so that the air pressure in the sealed space reaches a preset value;

[0011] Among them, the detection system includes at least two pipelines, which are respectively connected to the gas supply system and the sealed space, so that the gas in the gas supply system enters the sealed space through the pipelines. Detection elements are respectively arranged in at least two of the pipelines, and the detection elements in different pipelines have different ranges.

[0012] Preferably, the air supply system includes at least one of a variable frequency air compressor and a variable frequency fan.

[0013] Preferably, the detection element comprises an air pressure sensor and a flow sensor, and the air pressure sensor and the flow sensor are electrically connected to the processing module respectively.

[0014] Preferably, each of the pipelines is connected to and provided with the air pressure sensor and the flow sensor, and the air pressure sensors and the flow sensors in different pipelines have different measuring ranges;

[0015] And / or, one end of the pipeline is connected to the first cavity and the other end is connected to the second cavity, the air supply system is connected to the first cavity, the second cavity is connected to the sealed space, and an opening and closing component is provided in the pipeline, and the opening and closing component is used to close or open the pipeline.

[0016] Preferably, at least two groups of opening and closing components are arranged in each of the pipelines, and the air pressure sensor and the flow sensor are arranged between adjacent opening and closing components.

[0017] Preferably, along the extension direction of the pipeline, the pipeline includes a first part and a second part, and the diameter of the first part is greater than the diameter of the second part;

[0018] In the extension direction of the pipeline, a first step surface is formed between one end of the first part and the second part, a second step surface is formed between the other end of the first part and the second part, and the opening and closing component is arranged between the first step surface and the second step surface.

[0019] Preferably, the opening and closing assembly includes a sliding member slidably arranged on the first part along the extension direction of the pipeline and an elastic member for resetting the sliding member. The diameter of the sliding member is smaller than the diameter of the first part and larger than the diameter of the second part. When the sliding member slides relative to the pipeline, the sliding member can be sealed with the first step surface or the second step surface. An elastic inflatable cavity is arranged around the sliding member. When the elastic inflatable cavity is not inflated, a ventilation gap is arranged between the elastic inflatable cavity and the inner wall of the first part. After the elastic inflatable cavity is inflated, the elastic inflatable cavity is sealed with the inner wall of the first part.

[0020] Preferably, the sliding member comprises a first sliding block and a second sliding block, and in the extension direction of the pipeline, the first sliding block and the second sliding block are slidably matched, and at least part of the elastic inflatable cavity is located between the first sliding block and the second sliding block;

[0021] And / or, a sealing ring is provided at a position where the sliding member contacts the first step surface and the second step surface;

[0022] And / or, at least two first parts are provided along the extension direction of the pipeline, and the number of the opening and closing components corresponds one to one to the number of the first parts.

[0023] Preferably, the elastic inflatable cavity is connected to an inflatable pipe, the inflatable pipe runs through the pipeline and is connected to an external inflatable device, and the inflatable pipe is sealedly connected to the pipeline.

[0024] Preferably, the detection system includes a support body, the pipeline is formed in the support body, a connecting tube is slidably provided on the support body, the connecting tube is connected to the elastic inflation cavity, the support body is provided with a connecting cavity, the connecting tube is connected to the connecting cavity, one end of the inflation pipe is connected to the connecting cavity, and the other end is connected to an external inflation device, the connecting tube and the support body are slidingly connected at a clearance fit, and a sealing ring is provided at the clearance fit.

[0025] The present invention has the following advantages and beneficial effects:

[0026] Through the air supply system and the detection system, the sealed space can be inflated to make the air pressure reach the preset value. During the test, due to a certain amount of gas leakage in the civil air defense equipment, the air pressure in the sealed space will gradually decrease. In order to detect the air tightness performance of the civil air defense equipment, the air supply system compensates for the leakage by quantitative air supply, thereby maintaining the stability of the air pressure in the sealed space. The cooperation of the air supply system and the detection system realizes the precise control of the air pressure in the sealed space, and can quickly and accurately detect the performance of the civil air defense equipment. This detection method reduces the operating steps, simplifies the detection process, significantly improves the detection efficiency and quality consistency, and meets the needs of large-scale production and strict quality assurance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1It is a schematic diagram of the structure of an embodiment of the present application.

[0029] Figure 2 It is a structural diagram of civil air defense equipment.

[0030] Figure 3 It is a schematic diagram of the structure of the pipeline in the detection system.

[0031] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure of part A in the middle.

[0032] Figure 5 It is a structural schematic diagram of the sliding part.

[0033] The markings in the figure are:

[0034] 10. Civil defense equipment; 11. Sealed space; 20. Cover plate; 100. Air supply system; 200. Detection system; 210. Air pressure sensor; 220. Flow sensor; 230. Pipeline; 231. First part; 232. Second part; 233. First step surface; 234. Second step surface; 240. First cavity; 250. Second cavity; 260. Opening and closing assembly; 261. Sliding part; 261a. First slider; 261b. Second slider; 262. Elastic inflatable cavity; 263. Inflatable pipe; 264. Elastic part; 270. Support body; 271. Connecting pipe; 272. Connecting cavity; 273. Sealing ring; 300. Processing module. DETAILED DESCRIPTION

[0035] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0036] At present, there are two main methods for testing the air tightness of civil air defense equipment: constant pressure flow measurement method and natural pressure relief method. The constant pressure flow measurement method pressurizes the civil air defense equipment to a preset value and keeps it constant. When there is a small leak in the civil air defense equipment, the constant pressure is maintained by supplementing gas. According to the amount of supplemented gas, the air tightness performance data of the civil air defense equipment can be obtained. The smaller the supplementary amount, the better the air tightness. The natural pressure relief method is to stop the gas supply after pressurizing the civil air defense equipment to the set value and observe the natural drop of air pressure. The slower the drop in air pressure, the better the air tightness. By analyzing the air pressure drop data, the air tightness performance data of the civil air defense equipment can be obtained.

[0037] However, the inventors found that the testing process of these two methods is relatively complicated. In order to ensure the reliability of the results, it is usually necessary to use the two methods alternately and replace different equipment, which makes the testing process cumbersome and time-consuming, and it is difficult to achieve efficient testing.

[0038] In order to solve this problem, the present application proposes a civil air defense equipment air tightness detection system, which can flexibly switch between constant pressure flow measurement method and natural pressure relief method without replacing equipment or adjusting connections, thereby quickly and accurately measuring the air tightness of civil air defense equipment, improving detection efficiency and simplifying the operating process.

[0039] The following is a detailed description of an air tightness detection system for civil air defense equipment provided in an embodiment of the present application through specific embodiments and their application scenarios.

[0040] Reference Figure 1 , Figure 2 , an embodiment of the present application provides a civil air defense equipment air tightness detection system 200, which is used to detect the air tightness of the civil air defense equipment 10. In this embodiment, the civil air defense equipment 10 can be a civil air defense closed valve, wherein the civil air defense closed valve includes a valve seat and a valve cover, and is usually installed on a civil air defense building. In normal use, the interior of the civil air defense building can be connected to the outside by opening the valve cover. In order to detect the air tightness of the civil air defense closed valve, it is necessary to evaluate the sealing effect between the valve seat and the valve cover. Therefore, in this embodiment, a cover plate 20 is installed on the side of the valve seat facing away from the valve cover, so that a sealed space 11 is formed between the valve body, the cover plate 20 and the valve cover. In the sealed space 11, only the valve cover may leak, so the leakage data measured during the detection process can directly reflect the sealing effect between the valve cover and the valve seat, that is, the air tightness performance of the civil air defense equipment 10.

[0041] It is understandable that the civil air defense equipment 10 is not limited to closed valves, but also includes other equipment that needs to be tested for air tightness, such as civil air defense doors, sealed windows, etc. For example, when the test object is a civil air defense door, the openings at both ends thereof can be sealed by two cover plates 20. It should be noted that when performing air tightness tests on different types of civil air defense equipment 10, appropriate numbers and shapes of cover plates 20 can be selected according to actual needs to ensure that an effective sealed space 11 is formed between the cover plate 20 and the civil air defense equipment 10, so as to perform accurate air tightness tests.

[0042] The system includes an air supply system 100, a detection system 200 and a processing module 300. Among them, the air supply system 100 is used to provide an air source for the sealed space 11 for air tightness detection. During the implementation process, the air supply system 100 is connected to the sealed space 11 through the gas pipeline 230, and the air pressure in the sealed space 11 is increased to a preset detection value by adjusting the gas flow. Structurally, the air supply system 100 may include a variable frequency air compressor or a variable frequency fan, and the stability of the air pressure is controlled by adjusting its air supply rate. On the one hand, this ensures that the air pressure control range meets the needs of the sealing detection, and on the other hand, the air supply accuracy can be improved to a certain extent through variable frequency regulation, so that the air pressure in the sealed space 11 remains more stable during the detection process.

[0043] The detection system 200 is connected in series between the gas supply system 100 and the sealed space 11, and is mainly used to detect the air pressure in the sealed space 11 and the gas flow rate sent into the sealed space 11 by the gas supply system 100 in real time. The detection system 200 may include an air pressure sensor 210 and a flow sensor 220 to output an air pressure signal and a flow signal. Structurally, the detection system 200 connects the gas supply system 100 with the sealed space 11 through a pipeline 230, so that the gas of the gas supply system 100 can flow directly into the sealed space 11. The air pressure sensor 210 in the detection system 200 is used to detect the actual air pressure in the sealed space 11 to determine whether there is a leakage in the civil air defense equipment. At the same time, the flow sensor 220 monitors the gas flow rate sent into the sealed space 11 by the gas supply system 100 to compensate for the pressure drop caused by the leakage. In this way, the airtightness performance of the civil air defense equipment can be inferred by analyzing the flow data, that is, when the flow rate is small, it means that the sealing effect is better; and a large flow rate indicates that there is an obvious leakage. Exemplarily, a connector (such as a quick connector, etc.) may be provided on the cover plate 20 , so that the detection system 200 can be in communication with the sealed space 11 .

[0044] The processing module 300 is electrically connected to the detection system 200, receives air pressure signals and flow signals, and controls the air supply of the air supply system 100 based on these signal feedbacks to achieve a dynamic balance of the air pressure in the sealed space 11. Specifically, the processing module 300 can analyze the real-time air pressure data output by the air pressure sensor 210, and calculate whether it is necessary to adjust the air supply rate of the air supply system 100, so as to make the air pressure as close to the preset value as possible. In addition, the processing module 300 also monitors the change of the flow rate in real time during the process of replenishing the gas in the air supply system 100 according to the flow signal data, so as to accurately compensate for the leakage of the sealed space 11, so as to maintain the constancy of the air pressure in the sealed space 11 during the test, and further improve the accuracy of the detection.

[0045] In the air tightness detection of civil air defense equipment, the system gradually increases the air pressure in the sealed space 11 to a preset value through the quantitative air supply of the air supply system 100. When the constant pressure flow measurement method is used, when the air pressure in the sealed space 11 reaches the set detection air pressure, the system starts to monitor the real-time changes of air pressure and flow through the detection system 200, and transmits these data to the processing module 300 for analysis. If there is a slight leak in the civil air defense equipment, the processing module 300 will start the air replenishment operation to keep the air pressure in the sealed space 11 constant. At this time, by analyzing the amount of air replenishment, the system can evaluate the sealing, that is, the smaller the amount of air replenishment, the better the sealing. The air pressure and flow data under constant pressure can provide a quick and accurate basis for judging the air tightness of civil air defense equipment to a certain extent.

[0046] When measuring using the natural pressure relief method, when the air pressure in the sealed space 11 reaches the set value, the air supply operation is stopped, and the detection system 200 is used to continuously monitor the natural drop in air pressure over time in the sealed space 11, while recording the flow rate changes. The processing module 300 receives these data and analyzes them, and evaluates the airtightness of the civil air defense equipment by observing the rate of air pressure drop. The slower the air pressure drops, the better the airtightness; the faster the drop, the worse the airtightness. This method uses the data changes of natural pressure relief to achieve a rapid analysis of the airtightness performance of civil air defense equipment to a certain extent.

[0047] With the cooperation of these two methods, the system can conduct comprehensive air tightness testing under constant pressure and natural pressure relief conditions, which simplifies the operating process and improves detection efficiency, thereby effectively improving the detection quality and efficiency of civil defense equipment.

[0048] In some embodiments, the system further includes a display device connected to the processing module 300. The display device can display the data analyzed and processed by the processing module 300 in digital or graphical form, so that the inspectors can intuitively view and judge whether the air tightness of the civil air defense equipment is qualified. The connection between the display device and the processing module 300 can be a wireless connection (such as Wi-Fi, Bluetooth, etc.) or a wired connection (such as a data cable, USB, etc.) to meet the application requirements in different environments.

[0049] Specifically, the processing module 300 can not only collect and analyze air pressure and flow data in real time, but also compare them with preset reference data to determine whether the sealing performance of the civil air defense equipment meets the standards. The test results are displayed on the display device in the form of "qualified" or "unqualified", which effectively simplifies the judgment process of the test personnel and improves the test efficiency. This visual method makes the data presentation clearer and helps to improve the accuracy and convenience of the test.

[0050] According to an optional embodiment, the air supply system 100 is a variable frequency air supply control system. The air supply system 100 adopts a variable frequency air supply control system to automatically adjust the air supply rate according to the air pressure in the confined space, thereby more efficiently maintaining the required air pressure stability. This variable frequency control can adapt to the leakage changes of civil air defense equipment under different air tightness states, thereby improving the accuracy and real-time performance of air tightness detection.

[0051] According to an optional embodiment, the air supply system 100 includes at least one of a variable frequency air compressor and a variable frequency fan. The variable frequency air compressor is suitable for providing precise air volume control under high pressure conditions, while the variable frequency fan can provide a more stable air flow supply under medium and low pressure conditions. These two devices can be used alone or in combination according to actual detection requirements to achieve flexible and stable control of the air pressure in the confined space. This structural design is conducive to adapting to different detection requirements and further enhances the applicability and detection effect of the system.

[0052] According to an alternative embodiment, referring to Figure 1 , Figure 3 The detection system 200 includes a pipeline 230, which is connected to the gas supply system 100 and the sealed space 11 respectively, so that the gas in the gas supply system 100 enters the sealed space 11 through the pipeline 230. A detection element is arranged in the pipeline 230, and the detection element is electrically connected to the processing module. The detection element is used to detect the air pressure and / or flow. Through the structural design of the pipeline 230, the detection system 200 can effectively realize the stable transmission of the gas source, so that the gas supply system 100 can continuously and controllably deliver gas to the sealed space 11. This structure simplifies the gas flow path, helps to maintain the stable air pressure between the gas supply system 100 and the sealed space 11, thereby improving the operating efficiency and detection effect of the detection system 200.

[0053] According to an optional embodiment, the detection element includes an air pressure sensor 210 and a flow sensor 220, and the air pressure sensor 210 and the flow sensor 220 are respectively electrically connected to the processing module 300. This structural setting is conducive to the processing module 300 receiving the data signals of air pressure and flow in real time, and is convenient for monitoring and analyzing the changes of air pressure and flow in the sealed space 11. By directly connecting the air pressure sensor 210 and the flow sensor 220, the system can obtain the required detection data more quickly and accurately, thereby providing a reliable basis for air tightness evaluation.

[0054] According to an alternative embodiment, referring to Figure 1 , Figure 3, at least two pipelines 230 are provided, and each pipeline 230 is connected to an air pressure sensor 210 and a flow sensor 220, and the air pressure sensors 210 and flow sensors 220 in different pipelines 230 have different ranges. This design intention is to allow the civil air defense equipment to measure in different pressure ranges, so as to more comprehensively reflect the air tightness performance of the civil air defense equipment. Usually, when measuring in different pressure ranges, the sensor range or accuracy is insufficient. Specifically, if the sensor range is large, the measurement accuracy may decrease; if the sensor accuracy is high, the range will be limited. This is because the current manufacturing process makes it difficult to achieve a perfect balance between high accuracy and a large range for the sensor. By configuring sensors of different ranges for different pipelines 230, the design of this application enables different pipelines 230 to be switched for air supply and measurement according to actual needs during testing, thereby obtaining more accurate air tightness data.

[0055] According to an alternative embodiment, referring to Figure 1 , Figure 3 , one end of the pipeline 230 is connected to the first cavity 240 and the other end is connected to the second cavity 250, the gas supply system 100 is connected to the first cavity 240, and the second cavity 250 is connected to the sealed space 11. Through this design, the inlet ends of all pipelines 230 are connected to the gas supply system 100 through the first cavity 240, and the outlet ends are connected to the sealed space 11 through the second cavity 250. This connection method allows the gas supply port of the gas supply system 100 and the interface of the sealed space 11 to always maintain a fixed connection, without the need for disassembly or modification when switching the detection mode.

[0056] When in use, it is only necessary to control the opening and closing of different pipelines 230 to switch the pipelines 230 and conduct the appropriate path to select the air pressure and flow sensors 220 with different ranges for measurement. In this way, there is no need to change the connection structure between the air supply system 100 and the first cavity 240, nor to change the connection structure between the sealed space 11 and the second cavity 250. The inspector can easily switch to different detection modes, which is convenient for rapid adjustment of the measurement requirements of different pressures or flows, thereby improving the detection efficiency and simplifying the operation process. This design greatly improves the adaptability of the system under different measurement conditions.

[0057] According to an alternative embodiment, referring to Figure 3 , Figure 4 , an opening and closing assembly 260 is provided in the pipeline 230, and the opening and closing assembly 260 is used to close or open the pipeline 230. The opening and closing assembly 260 can close or open the pipeline 230 when necessary, so as to adjust the airflow path in different test modes. For example, when it is necessary to switch the detection method or perform tests in different pressure ranges, the gas flow can be controlled by the opening and closing assembly 260, so as to flexibly adapt to the detection requirements.

[0058] During the natural pressure relief method measurement process, the system selects a pipeline 230 channel with an appropriate range according to the initial test pressure, and first pressurizes the sealed space 11 to the specified range. Then, the air tightness is evaluated by detecting the natural drop in air pressure over time in the sealed space 11. When the air pressure drops to the next range interval, the system automatically switches to another pipeline 230 that meets the pressure range and accuracy requirements, and closes the pipeline 230 that does not meet the range requirements, and continues to monitor the changes in air pressure in the sealed space 11. In this way, by gradually switching pipelines 230 with appropriate ranges, the system can more accurately capture the pressure relief data at each pressure stage, thereby obtaining a more accurate air tightness evaluation result.

[0059] In the constant pressure flow measurement method, the system also selects the pipeline 230 of the corresponding range according to the test pressure to be turned on, and inflates the sealed space 11 to the set pressure range. Next, the air supply system 100 maintains a constant air pressure in the sealed space 11 by quantitatively supplying air. The processing module 300 monitors the flow data in real time and analyzes slight changes in the air supply flow rate. When the flow change exceeds a certain range, the system switches to the appropriate pipeline 230 and closes the pipeline 230 that does not meet the range requirements to ensure the accuracy of the flow data. This gradual switching method helps to obtain more accurate flow airtightness data at different flow stages, thereby more accurately evaluating the airtightness performance of civil defense equipment.

[0060] Exemplarily, the test is divided into low voltage, medium voltage and high voltage, and the civil air defense equipment is tested separately.

[0061] According to an alternative embodiment, referring to Figure 3 , Figure 4 At least two groups of opening and closing components 260 are arranged in each pipeline 230, and the air pressure sensor 210 and the flow sensor 220 are arranged between adjacent opening and closing components 260. When the pipeline 230 is closed, the two opening and closing components 260 form a closed area to protect the air pressure sensor 210 and the flow sensor 220. This design can effectively isolate the sensor when the pipeline 230 is not ventilated, thereby avoiding the loss of the sensor due to long-term exposure to the external environment, which helps to extend its service life. In addition, this protection method can also effectively reduce the impact of external interference on the sensor, help maintain the accuracy and stability of the sensor during long-term use, thereby ensuring the reliability of the measurement data.

[0062] According to an alternative embodiment, referring to Figure 3 , Figure 4, along the extension direction of the pipeline 230, the pipeline 230 includes a first part 231 and a second part 232, and the diameter of the first part 231 is greater than the diameter of the second part 232. In the extension direction of the pipeline 230, a first step surface 233 is formed between one end of the first part 231 and the second part 232, and a second step surface 234 is formed between the other end of the first part 231 and the second part 232. The opening and closing component 260 is arranged between the first step surface 233 and the second step surface 234. The first step surface 233 and the second step surface 234 limit the range of movement of the opening and closing component 260, ensuring that the opening and closing component 260 can be stably installed in an appropriate position. At the same time, the first step surface 233 and the second step surface 234 provide a fitting support position for the opening and closing component 260, so that the opening and closing component 260 can accurately cooperate with the pipeline 230. When the opening and closing component 260 is at the first step surface 233 or the second step surface 234, the pipeline 230 can be reliably closed, reducing the risk of gas leakage, and helping to maintain a stable air pressure in the sealed space 11 during the detection process, which is beneficial to improving the accuracy of airtightness measurement.

[0063] According to an optional embodiment, the opening and closing component 260 includes a sliding member 261 slidably arranged on the first part 231 along the extension direction of the pipeline 230 and an elastic member 264 for resetting the sliding member 261. The diameter of the sliding member 261 is smaller than the diameter of the first part 231 and larger than the diameter of the second part 232. When the sliding member 261 slides relative to the pipeline 230, the sliding member 261 can be sealed with the first step surface 233 or the second step surface 234. An elastic inflatable cavity 262 is arranged around the sliding member 261. When the elastic inflatable cavity 262 is not inflated, a ventilation gap is arranged between the elastic inflatable cavity 262 and the inner wall of the first part 231. After the elastic inflatable cavity 262 is inflated, the elastic inflatable cavity 262 is sealed with the inner wall of the first part 231.

[0064] When the elastic inflatable cavity 262 is inflated, it expands and closely matches with the inner wall of the first part 231 to form a seal, thereby blocking the passage of gas. At this time, driven by the gas pressure, the sliding member 261 will slide along the first part 231 under the support of the elastic inflatable cavity 262, and closely fit with the second step surface 234, forming a double seal: on the one hand, the elastic inflatable cavity 262 after inflation is sealed with the inner wall of the first part 231, and on the other hand, the sliding member 261 is sealed with the second step surface 234. This design not only utilizes the controllable sealing performance of the elastic inflatable cavity 262, but also further improves the sealing effect through the cooperation of the sliding member 261 and the step surface, which is conducive to achieving higher-precision pressure control and measurement during airtightness testing. When the elastic inflatable cavity 262 is deflated or evacuated, under the action of the elastic member 264, the sliding member 261 will slide to the area between the first step surface 233 and the second step surface 234, thereby opening the channel. Among them, the elastic member 264 is a spring.

[0065] According to an alternative embodiment, referring to Figure 4 , Figure 5 The sliding member 261 includes a first slider 261a and a second slider 261b. In the extension direction of the pipeline 230, the first slider 261a and the second slider 261b are slidably matched, and at least part of the elastic inflatable cavity 262 is located between the first slider 261a and the second slider 261b. To achieve relative sliding, the first slider 261a and the second slider 261b can be connected by a sliding rod so that the two can move closer to or farther from each other as needed.

[0066] When the sealed space 11 is inflated and the elastic inflatable cavity 262 is inflated, the first slider 261a and the second slider 261b will be affected by the air pressure respectively, so as to approach each other, further compressing the elastic inflatable cavity 262 located therebetween. In this way, the elastic inflatable cavity 262 is in closer contact with the inner wall of the first part 231, achieving a better sealing effect. In addition, as the air pressure in the sealed space 11 increases, the squeezing force of the first slider 261a and the second slider 261b on the elastic inflatable cavity 262 increases accordingly, so that the elastic inflatable cavity 262 and the inner wall of the first part 231 have a better sealing effect. This design can automatically adjust the sealing pressure when the air pressure fluctuates while improving the sealing performance, so as to ensure a more stable measurement accuracy during the airtight detection process.

[0067] According to an optional embodiment, a sealing ring is provided at the contact point between the sliding member 261 and the first step surface 233 and the second step surface 234. The sealing ring forms a further seal when the sliding member 261 contacts the step surface, thereby providing better protection in terms of gas leakage control.

[0068] According to an alternative embodiment, referring to Figure 3 , Figure 4 At least two first parts 231 are arranged along the extension direction of the pipeline 230, and the number of the opening and closing components 260 corresponds to the number of the first parts 231. Adjacent opening and closing components 260 do not affect each other. This design can ensure that adjacent opening and closing components 260 are independent of each other and not interfered with during operation, thereby maintaining good sealing performance under various operating conditions and improving the operational flexibility and stability of the system.

[0069] It is understandable that when the opening and closing component 260 is attached to the first step surface 233 or the second step surface 234, one end of the opening and closing component 260 will be in close contact with the step surface, blocking the flow of gas in the pipeline 230. In this case, the gas in the channel will directly act on the end surface to form a closed area. At the same time, the other end surface of the opening and closing component 260 will be exposed to the gas in the channel and directly contact the gas. Since the exposed area of ​​the end surface is large, the area of ​​action of the gas is also correspondingly large.

[0070] Under the same gas pressure, a larger area will generate a greater thrust on the opening and closing component 260, thereby making the opening and closing component 260 more closely attached to the first step surface 233 or the second step surface 234. This design utilizes the principle of gas thrust to make the fit between the opening and closing component 260 and the first step surface 233 or the second step surface 234 more stable, effectively improving the sealing performance.

[0071] According to an alternative embodiment, referring to Figure 4 , Figure 5 The elastic inflatable cavity 262 is connected to an inflatable pipe 263, which penetrates the pipeline 230 and is connected to an external inflatable device, and the inflatable pipe 263 is sealed to the pipeline 230. Through the inflatable pipe 263, the inflation and exhaust of the elastic inflatable cavity 262 can be effectively controlled, thereby improving the response speed and operation convenience of the system.

[0072] According to an optional embodiment, the detection system 200 includes a support body 270, the pipeline 230 is formed in the support body 270, a connecting tube 271 is slidably provided on the support body 270, the connecting tube 271 is connected to the elastic inflation cavity 262, the support body 270 is provided with a connecting cavity 272, the connecting tube 271 is connected to the connecting cavity 272, one end of the inflation pipe 263 is connected to the connecting cavity 272, and the other end is connected to an external inflation device, the connecting tube 271 and the support body 270 are slidingly connected at a clearance fit, and a sealing ring 273 is provided at the clearance fit.

[0073] It is understandable that the design of the sealing ring 273 is conducive to preventing the gas in the elastic inflatable cavity 262 from leaking under normal circumstances, thereby ensuring the inflation stability of the cavity. When the air pressure in the sealed space 11 is too high or encounters special circumstances, the elastic inflatable cavity 262 may be subjected to excessive squeezing from the first slider 261a, the second slider 261b and the inner wall of the first part 231, causing it to rupture or be damaged. In this case, the excessive pressure forces the sealing ring 273 to deform, thereby appropriately releasing the pressure of the elastic inflatable cavity 262, allowing the gas in the cavity to release pressure through the gap to keep the air pressure within a reasonable range, thereby reducing the risk of damage to the cavity and ensuring the reliability of the system.

[0074] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A civil air defense equipment air tightness detection system, used for detecting the air tightness of civil air defense equipment (10), wherein the civil air defense equipment (10) is sealed by a cover plate (20) to form a sealed space (11), characterized in that: include: An air supply system (100) is used to provide an air source to the sealed space (11), and the air supply system (100) is a variable frequency air supply control system; a detection system (200) connected in series between the gas supply system (100) and the sealed space (11), for detecting the gas pressure in the sealed space (11) and the gas flow rate of the gas supplied into the sealed space (11) by the gas supply system (100), and outputting a gas pressure signal and a flow rate signal; a processing module (300) electrically connected to the detection system (200), and configured to receive the air pressure signal and the flow rate signal, and control the air supply volume of the air supply system (100) based on the air pressure signal and the flow rate signal, so that the air pressure in the sealed space (11) reaches a preset value; The detection system (200) comprises at least two pipelines (230), the pipelines (230) being respectively connected to the gas supply system (100) and the sealed space (11), so that the gas in the gas supply system (100) enters the sealed space (11) through the pipelines (230), and detection elements are respectively arranged in at least two of the pipelines (230), and the detection elements in different pipelines (230) have different measuring ranges; An opening and closing component (260) is arranged in the pipeline (230), and the opening and closing component (260) is used to close or open the pipeline (230); Along the extension direction of the pipeline (230), the pipeline (230) comprises a first part (231) and a second part (232), and the diameter of the first part (231) is greater than the diameter of the second part (232); In the extension direction of the pipeline (230), a first step surface (233) is formed between one end of the first part (231) and the second part (232), a second step surface (234) is formed between the other end of the first part (231) and the second part (232), and the opening and closing component (260) is arranged between the first step surface (233) and the second step surface (234); The opening and closing assembly (260) comprises a sliding member (261) slidably arranged on the first part (231) along the extension direction of the pipeline (230) and an elastic member (264) used to reset the sliding member (261); the diameter of the sliding member (261) is smaller than the diameter of the first part (231) and larger than the diameter of the second part (232); when the sliding member (261) slides relative to the pipeline (230), the sliding member (261) can be retracted relative to the pipeline (230). The first step surface (233) is in sealing cooperation or in sealing cooperation with the second step surface (234); an elastic inflatable cavity (262) is arranged around the sliding member (261); when the elastic inflatable cavity (262) is not inflated, a ventilation gap is arranged between the elastic inflatable cavity (262) and the inner wall of the first part (231); after the elastic inflatable cavity (262) is inflated, the elastic inflatable cavity (262) is in sealing cooperation with the inner wall of the first part (231); The sliding member (261) comprises a first slider (261a) and a second slider (261b). In the extension direction of the pipeline (230), the first slider (261a) and the second slider (261b) are slidably matched, and at least a portion of the elastic inflatable cavity (262) is located between the first slider (261a) and the second slider (261b), so that the first slider (261a) and the second slider (261b) are brought closer to each other under the action of air pressure, thereby compressing the elastic inflatable cavity (262).

2. The air tightness detection system for civil air defense equipment according to claim 1, characterized in that; The air supply system (100) comprises at least one of a variable frequency air compressor and a variable frequency fan.

3. The air tightness detection system for civil air defense equipment according to claim 1, characterized in that: The detection element comprises an air pressure sensor (210) and a flow sensor (220), and the air pressure sensor (210) and the flow sensor (220) are electrically connected to the processing module (300) respectively.

4. The air tightness detection system for civil air defense equipment according to claim 3, characterized in that: The air pressure sensor (210) and the flow sensor (220) are connected and arranged in each pipeline (230), and the air pressure sensors (210) and the flow sensors (220) in different pipelines (230) have different measuring ranges; And / or, one end of the pipeline (230) is connected to the first cavity (240) and the other end is connected to the second cavity (250), the gas supply system (100) is connected to the first cavity (240), and the second cavity (250) is connected to the sealed space (11).

5. The air tightness detection system for civil air defense equipment according to claim 3, characterized in that: At least two groups of opening and closing components (260) are arranged in each pipeline (230), and the air pressure sensor (210) and the flow sensor (220) are arranged between adjacent opening and closing components (260).

6. The air tightness detection system for civil air defense equipment according to claim 1, characterized in that: The sliding member (261) is provided with a sealing ring at a contact point with the first step surface (233) and the second step surface (234); And / or, at least two first parts (231) are provided along the extension direction of the pipeline (230), and the number of the opening and closing components (260) corresponds one to one to the number of the first parts (231).

7. The air tightness detection system for civil air defense equipment according to claim 1, characterized in that: The elastic inflatable cavity (262) is connected to an inflatable pipe (263), the inflatable pipe (263) passes through the pipeline (230) and is connected to an external inflatable device, and the inflatable pipe (263) and the pipeline (230) are sealed.

8. The air tightness detection system for civil air defense equipment according to claim 7, characterized in that: The detection system (200) comprises a support body (270), the pipeline (230) is formed in the support body (270), a connecting pipe (271) is slidably provided on the support body (270), the connecting pipe (271) is communicated with the elastic inflation cavity (262), the support body (270) is provided with a connecting cavity (272), the connecting pipe (271) is communicated with the connecting cavity (272), one end of the inflation pipe (263) is connected to the connecting cavity (272), and the other end is communicated with an external inflation device, the connecting pipe (271) and the support body (270) are in a clearance fit at the sliding connection, and a sealing ring (273) is provided at the clearance fit.

Images