Pressurizing system for detecting airtightness of civil air defense door

Abstract

The utility model relates to a pressurization system used for civil air defense door leakproofness detection. The method is realized by time-sharing work of a rapid voltage building branch and a slow-speed voltage control branch. Rapidly inflating the overpressure chamber through a rapid pressure buildup branch consisting of an air compressor, a needle valve and a pipeline, and closing the rapid pressure buildup branch when a pressure value measured by a micro differential pressure gauge mounted on the overpressure chamber and displayed by a secondary instrument reaches 80%-90% of a set overpressure value; and switching to a retarding pressure control branch consisting of a gas cylinder group, an angle valve, a busbar, a pressure gauge, a ball valve, a pressure reducing valve, a needle valve, a flow meter and a pipeline, opening the retarding pressure control branch, slowly adjusting the needle valve to supplement pressure for the overpressure chamber at a retarding speed, and when an overpressure value shown by a secondary instrument reaches a preset range of + 2Pa and stable pressure can be maintained, starting the secondary instrument. And the indicating value of the branch digital display flowmeter is the actual leakage rate during air-tightness detection of the civil air defense door. According to the pressurization system working in a time-sharing manner, the detection test period of the airtightness of the civil air defense door is shortened, and the stability of air supply is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of civil air defense engineering, in particular to a pressurizing system for detecting the tightness of civil air defense doors. Background Art

[0002] Civil air defense doors are the entrances and exits of civil air defense projects. They are important protective equipment that blocks or weakens shock waves and prevents the entry of biological and chemical agents. Their sealing performance directly affects the protective performance of civil air defense projects, so the sealing performance test of civil air defense doors is particularly important. According to Articles 4.1.1, 4.1.2 and 4.3.2 of the "Test and Quality Inspection Standard for Protective Equipment of Civil Air Defense Projects (RFJ04-2009)": Protective equipment must undergo a sealing performance test; under standard air pressure, the overpressure values ​​for single-leaf and double-leaf protective sealed doors are 100Pa and 50Pa respectively; during the test, the inflation process should be slow, and the reading should be started after the inflation pressure reaches the set overpressure value and stabilizes. The reading within the range of the set overpressure value to the set overpressure value + 2Pa is the valid data, so the stability of the inflation pressurization is related to the success or failure of the test.

[0003] The existing pressurized system for testing the tightness of civil air defense doors consists of an air compressor, air supply lines, valves, differential pressure gauges, and flow meters. The air compressor provides pressure medium, which enters the overpressure chamber through the air supply lines, valves, and flow meters. The pressure in the overpressure chamber is controlled by adjusting the valve opening. The amount of leakage from the civil air defense door is measured using a differential pressure gauge installed in the overpressure chamber. The airtightness of the civil air defense door is determined according to Table 4.1.6 of the "Testing and Quality Inspection Standard for Civil Air Defense Engineering Protective Equipment (RFJ04-2009)."

[0004] Although the existing technical solution is simple, the air compressor is controlled by a pressure switch. When the pressure of the gas in the air tank is lower than the lower limit of the set value due to use or leakage, the air compressor will start, and when the pressure of the air tank approaches the upper limit of the set value, the air compressor will stop. Frequent starts and stops cause shock fluctuations in the outlet pressure, resulting in unstable air supply. The impact is most obvious when the pressure is increased to near the set overpressure value during the detection of civil defense doors. It is difficult to meet the requirements of Article 4.3.2 of the "Test and Quality Inspection Standard for Protective Equipment of Civil Defense Engineering (RFJ04-2009)" "... Readings within the range of the set overpressure value to the set overpressure value + 2Pa are valid data." In addition, the front-end air supply pressure is high (about 0.7MPa), while the overpressure value required for detection is 100Pa or 50Pa. The difference between the air supply pressure and the target pressure is large, making it difficult to achieve pressure regulation directly by controlling the valve opening. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the utility model provides a pressurizing system for detecting the tightness of civil defense doors, which overcomes the shortcomings of the existing technology, solves the problem of pressure shock fluctuations at the air supply outlet, reduces the technical difficulty of pressure adjustment within the range of the set overpressure value to the set overpressure value + 2Pa, and improves the success rate and test efficiency of the test.

[0006] In order to solve the above technical problems, one of the purposes of this utility model is to provide a pressurizing system for detecting the tightness of civil air defense doors. The system consists of a fast pressure building branch, a slow pressure control branch, a low-pressure pipeline 3, and a micro differential pressure gauge 4.

[0007] The rapid pressure-building branch consists of an air compressor 1.1, a needle valve 1.2, and a pipeline 1.3, and is used to quickly replenish air to the overpressure chamber to shorten the test time.

[0008] The slow-speed pressure-control branch circuit consists of a gas cylinder 2.1, a high-pressure pipeline 2.2, an angle valve 2.3, a busbar 2.4, a three-way valve 2.5, a front-end pressure gauge 2.6, a ball valve 2.7, a two-stage pressure-reducing valve 2.8, a two-way valve 2.9, a pressure gauge 2.10 at the pressure-reducing valve outlet, a needle valve 2.11, and a digital flowmeter 2.12. It is used to achieve stable gas supply and precise pressure control by secondary pressurization after the overpressure reaches 80% to 90% of the set overpressure value.

[0009] The low-pressure pipeline 3 supplies gas to the overpressure chamber;

[0010] The measuring port of the micro differential pressure gauge 4 is connected to the pressure measuring port of the overpressure chamber to measure the pressure of the overpressure chamber.

[0011] Furthermore, the system also includes a power supply, power supply lines, signal lines and secondary instruments. The power supply is specifically used to power the digital flow meter 2.12 and the micro differential pressure gauge 4. The secondary instrument is used to display the overpressure value measured by the micro differential pressure gauge 4.

[0012] Furthermore, the rapid pressure building branch and the slow pressure control branch merge into the three-way valve 2.13, and the other outlet of the three-way valve 2.13 is connected to the air inlet of the overpressure chamber through the low-pressure pipeline 3.

[0013] Furthermore, the outlet pressure gas of the air compressor 1.1 enters the overpressure chamber through the pipeline needle valve 1.2, the pipeline 1.3, and the low-pressure pipeline 3.

[0014] Furthermore, the gas cylinder 2.1 is connected to the bus 2.4 through the high-pressure pipeline 2.2 and the angle valve 2.3. The outlet of the bus 2.4 is connected to the ball valve 2.7 through the three-way 2.5. The front pressure gauge 2.6 is installed on the three-way 2.5. The outlet of the ball valve 2.7 is connected to the high-pressure air inlet of the two-stage pressure reducing valve 2.8. The low-pressure port of the two-stage pressure reducing valve 2.8 is connected to the needle valve 2.11 through the three-way 2.9. The pressure gauge 2.10 at the outlet of the pressure reducing valve is installed on the two-way 2.9. The outlet of the needle valve 2.11 is connected to the digital flowmeter 2.12. The digital flowmeter 2.12 enters the overpressure chamber through the three-way 2.13 and the low-pressure pipeline 3.

[0015] The above one or more technical solutions of the present invention have at least one or more of the following technical effects:

[0016] 1) Setting up a fast pressure-building branch shortens the test time and improves test efficiency;

[0017] 2) The slow-speed control branch is set to achieve stable air supply and controllable pressure after the overpressure value in the overpressure chamber reaches 80% to 90% of the set overpressure value, meeting the requirement of Article 4.3.2 of the "Test and Quality Inspection Standard for Civilian Protection Engineering Protective Equipment (RFJ04-2009)" that "… readings within the range of the set overpressure value to the set overpressure value + 2Pa are valid data."

[0018] 3) The two branches are organically combined and work in time-sharing mode, which improves the success rate of the test.

[0019] The pressurized system of the utility model can also be charged with air by the air compressor for the buffer tank, and the gas branch after the buffer tank can be connected with the attached Figure 1 The middle components 2.5 to 2.13 are connected in sequence, and then the overpressure chamber is pressurized. The inconvenience is that the buffer tank is large and heavy and is not easy to be moved to the field for detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 : Schematic diagram of the pressurization system for testing the tightness of civil air defense doors.

[0021] Among them: 1.1-air compressor, 1.2-needle valve 1, 1.3-pipeline, 2.1-gas cylinder, 2.2-high-pressure pipeline, 2.3-angle valve, 2.4-busbar, 2.5-three-way 1, 2.6-front-end pressure gauge, 2.7-ball valve, 2.8-two-stage pressure reducing valve, 2.9-three-way 2, 2.10-pressure reducing valve outlet pressure gauge, 2.11-needle valve 2, 2.12-digital flowmeter, 2.13-three-way 3, 3-low-pressure pipeline, 4-micro differential pressure gauge. Specific implementation plan

[0022] The utility model relates to a pressurizing system for detecting the tightness of civil air defense doors. The system pressurization is realized by two branches working in time sharing, namely a fast pressure building branch and a slow pressure control branch. After the overpressure chamber of the civil air defense door is constructed, the overpressure chamber is firstly inflated quickly through a fast pressure building branch composed of an air compressor, a needle valve and a pipeline. The inflation speed is adjusted by the needle valve of the branch. When the pressure value measured by the micro differential pressure gauge installed on the overpressure chamber displayed by the secondary instrument reaches 80% to 90% of the set overpressure value (100Pa for a single-leaf door and 50Pa for a double-leaf door), the needle valve and the air compressor of the fast pressure building branch are closed; the pressure is switched to the system composed of a gas cylinder group, an angle valve, a bus bar, a pressure gauge, a ball valve, a pressure reducing valve, a needle valve, a flow control valve, a pressure reducing ... The slow-speed pressure control branch composed of a meter and pipeline (the number of gas cylinders used is determined according to the volume of the overpressure chamber of the civil air defense door), open the valve of the gas cylinder mouth to be used, the angle valve of the branch where it is located, and the ball valve of the branch where it is located, and then slowly adjust the opening of the needle valve of the branch where it is located to slowly replenish the pressure of the overpressure chamber. When the overpressure value of the overpressure chamber measured by the current micro-differential pressure gauge shown by the secondary instrument reaches the set overpressure value to the set overpressure value + 2Pa and can maintain a stable pressure, the reading of the digital flow meter of the branch where it is located is the actual leakage volume during the airtightness test of the civil air defense door. The organic combination of rapid pressure building and slow-speed control and the time-sharing pressurization system are adopted to shorten the test cycle of the airtightness test of the civil air defense door and improve the stability of the gas supply, and finally achieve the goal of precise pressure control.

[0023] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the embodiments and drawings of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments obtained. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0024] The pressurization system is composed of the following components: Figure 1 To better understand the present invention, the overpressure chamber, power supply, power lines, signal lines, and secondary instruments are introduced. The DC power supply is used to power the digital flowmeter 2.12 and the micro differential pressure gauge 4. The secondary instrument is used to display the overpressure value measured by the micro differential pressure gauge 4. The introduced parts are not the subject of this invention.

[0025] The pressurization system of the present invention primarily comprises a rapid pressure-building branch, a slow pressure-control branch, a low-pressure pipeline 3, and a differential pressure gauge 4. The rapid pressure-building branch comprises an air compressor 1.1, a needle valve 1.2, and a pipeline 1.3; the slow pressure-control branch comprises a gas cylinder 2.1, a high-pressure pipeline 2.2, an angle valve 2.3, a busbar 2.4, a three-way valve 1 2.5, a front-end pressure gauge 2.6, a ball valve 2.7, a two-stage pressure reducing valve 2.8, a two-way valve 2.9, a pressure gauge 2.10 at the pressure reducing valve outlet, a needle valve 2.11, and a digital flowmeter 2.12.

[0026] The functions of each main component are as follows: the rapid pressure building branch is used to quickly supply air to the overpressure chamber to shorten the test time; the slow pressure control branch is used to achieve smooth air supply and precise pressure control for secondary pressurization after the overpressure value reaches 80% to 90% of the set overpressure value;

[0027] The working principle of the pressurization system is as follows Figure 1 As shown, the system pressurization is divided into two stages. First, the overpressure chamber is quickly inflated through the fast pressure building branch, and then it is switched to the slow control branch for smooth air supply and precise pressure control.

[0028] When building up pressure quickly, close ball valve 2.7 and needle valve 2.11, open needle valve 1.2, and start air compressor 1.1; the air compressor outlet pressure gas enters the overpressure chamber through pipeline needle valve 1.2, pipeline 1.3, and low-pressure pipeline 3. The micro-differential pressure gauge 4 installed on the overpressure chamber collects the pressure in the overpressure chamber and converts it into a digital signal for display on the secondary instrument. When the overpressure value shown on the secondary instrument reaches 70% to 80% of the set overpressure value, close needle valve 1.2 and turn off air compressor 1.1.

[0029] When controlling the pressure slowly, first confirm that needle valve 1.2, needle valve 2.11, and ball valve 2.7 are closed. Determine the number of gas cylinders to be opened based on the volume of the overpressure chamber of the air defense door. Open the integrated bottle mouth valve and angle valve 2.3 of gas cylinder 2.1. The gas in the gas cylinder will enter bus 2.4 through high-pressure pipeline 2.2 and angle valve 2.3. The front-end pressure gauge 2.6 installed on the three-way valve 2.5 will display the current gas pressure value in the bus. Then open ball valve 2.7. The gas enters needle valve 2.11 through ball valve 2.7 and two-stage pressure reducing valve 2.8. Pressure gauge 2.10, mounted on tee 2.9, displays the outlet pressure of two-stage pressure reducing valve 2.8. Adjusting two-stage pressure reducing valve 2.8 can change its reduced pressure outlet pressure to (0.02-0.05) MPa. Open needle valve 2.11, and the gas further enters the overpressure chamber through needle valve 2.11, digital flowmeter 2.12, and low-pressure pipeline 3. When the overpressure value indicated by the secondary instrument is lower than the set overpressure value, appropriately increase the opening of needle valve 2.11. When the overpressure value exceeds the set overpressure value, appropriately decrease the opening of needle valve 2.11. Stop adjusting needle valve 2.11 until the overpressure value indicated by the secondary instrument is within the range of the set overpressure value to the set overpressure value + 2 Pa and can be maintained. The value indicated by digital flowmeter 2.12 is the actual leakage of the civil air defense door.

[0030] After the test is completed, release the pressure, close the valve of the gas cylinder 2.1, remove the low-pressure pipeline 3 from the overpressure chamber, and empty the gas in the bus 2.4 and all pipelines.

[0031] In order to make the technical solutions and advantages of this utility model clearer, the following Figure 1The embodiment of the utility model is described in full and detail. A pressurizing system for detecting the tightness of civil air defense doors comprises two branches: a rapid pressure building and a slow pressure control, which are organically combined and work in time-sharing manner.

[0032] The connections between the components described in this solution can be any one of a threaded interface, flange interface, welded interface, or pneumatic quick connector, or a combination thereof. The connection interface method is common knowledge in the industry and does not affect the specific implementation of this utility model. The following focuses on the connection sequence of the components that affect the operation of the system.

[0033] The rapid pressure-building branch and the slow-speed pressure-control branch merge into the three-way three 2.13. The other outlet of the three-way three 2.13 is connected to the air inlet of the overpressure chamber through the low-pressure pipeline 3. The bottle mouth outlet of the gas cylinder 2.1 is connected to the air inlet of the angle valve 2.3 through the high-pressure pipeline 2.2. The outlet of the angle valve 2.3 is connected to the corresponding interface on the bus 2.4. The outlet of the bus 2.4 is connected to the three-way one 2.5. The front-end pressure gauge 2.6 is installed on the three-way one 2.5. The other outlet of the three-way one 2.5 is connected to the air inlet of the ball valve 2.7. The outlet of the ball valve 2.7 is connected to the high-pressure air inlet of the two-stage pressure reducing valve 2.8. The low-pressure port of stage pressure reducing valve 2.8 is connected to one port of tee 2.9; pressure gauge 2.10 is installed on one port of tee 2.9; the other port of tee 2.9 is connected to the air inlet of needle valve 2.11; the outlet of needle valve 2.11 is connected to the air inlet of digital flowmeter 2.12; the outlet of digital flowmeter 2.12 is connected to one port of tee 2.13; the measuring port of micro differential pressure gauge 4 is connected to the pressure measuring port of the overpressure chamber. The power supply simultaneously supplies power to digital flowmeter 2.12 and micro differential pressure gauge 4. The overpressure chamber pressure signal measured by micro differential pressure gauge 4 is displayed on the secondary instrument.

[0034] The specific implementation of the present invention is not unique, but this does not affect the specific effects of the present invention. The specific embodiment of the present invention (omitting the rapid pressure-building branch) generally integrates multiple gas cylinders 2.1, high-pressure pipelines 2.2, angle valves 2.3, and busbars 2.4 into one body (assuming it is named A), and integrates three-way valve 1 2.5, front-end pressure gauge 2.6, ball valve 2.7, two-stage pressure reducing valve 2.8, three-way valve 2.9, pressure reducing valve outlet pressure gauge 2.10, needle valve 2.11, and digital flowmeter 2.12 into a hard pipeline (assuming it is named B). Finally, A and B are integrated into a frame, and then the two branches are merged to supply gas to the overpressure chamber through the low-pressure pipeline 3.

[0035] Obviously, those skilled in the art may make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

[0036] The utility model has been successfully used to test the tightness of composite material civil air defense doors of various series and models. The results show that the operation is simple and efficient, the air supply is stable, and the success rate of the test is high.

Claims

1. A pressurizing system for detecting the tightness of civil air defense doors, characterized in that: The system consists of a fast pressure building branch, a slow pressure control branch, a low-pressure pipeline (3), and a micro differential pressure gauge (4). The rapid pressure building branch is composed of an air compressor (1.1), a needle valve (1.2) and a pipeline (1.3), and is used to quickly replenish air to the overpressure chamber to shorten the test time; The slow-speed pressure control branch circuit is composed of a gas cylinder (2.1), a high-pressure pipeline (2.2), an angle valve (2.3), a busbar (2.4), a three-way valve (2.5), a front-end pressure gauge (2.6), a ball valve (2.7), a two-stage pressure reducing valve (2.8), a two-way valve (2.9), a pressure gauge at the pressure reducing valve outlet (2.10), a needle valve (2.11) and a digital flow meter (2.12), and is used to achieve a stable gas supply and precise pressure control by secondary pressurization after the overpressure value reaches 80% to 90% of the set overpressure value; The low-pressure pipeline (3) supplies air to the overpressure chamber; The measuring port of the micro differential pressure gauge (4) is connected to the pressure measuring port of the overpressure chamber to measure the pressure of the overpressure chamber.

2. The pressurizing system for detecting the tightness of civil air defense doors according to claim 1 is characterized in that: The system also includes a power supply, a power supply line, a signal line and a secondary instrument. The power supply is specifically used to power a digital flow meter (2.12) and a micro differential pressure gauge (4). The secondary instrument is used to display the overpressure value measured by the micro differential pressure gauge (4).

3. The pressurizing system for detecting the tightness of civil air defense doors according to claim 1 is characterized in that: The fast pressure building branch and the slow pressure control branch merge into the three-way valve (2.13), and the other outlet of the three-way valve (2.13) is connected to the air inlet of the superpressure chamber through the low-pressure pipeline (3).

4. The pressurizing system for detecting the tightness of civil air defense doors according to claim 1 is characterized in that: The outlet pressure gas of the air compressor (1.1) enters the overpressure chamber through the needle valve (1.2), the pipeline (1.3) and the low-pressure pipeline (3).

5. The pressurizing system for detecting the tightness of civil air defense doors according to claim 1 is characterized in that: The gas cylinder (2.1) is connected to the busbar (2.4) through the high-pressure pipeline (2.2) and the angle valve (2.3). The outlet of the busbar (2.4) is connected to the ball valve (2.7) through the three-way one (2.5). The front pressure gauge (2.6) is installed on the three-way one (2.5). The outlet of the ball valve (2.7) is connected to the high-pressure air inlet of the two-stage pressure reducing valve (2.8). The low-pressure port of the two-stage pressure reducing valve (2.8) is connected to the needle valve two (2.11) through the three-way two (2.9). The pressure gauge (2.10) at the outlet of the pressure valve is installed on the three-way two (2.9). The outlet of the needle valve two (2.11) is connected to the digital flow meter (2.12). The digital flow meter (2.12) enters the overpressure chamber through the three-way three (2.13) and the low-pressure pipeline (3).

6. The pressurizing system for detecting the tightness of civil air defense doors according to claim 1, characterized in that: The number of the gas cylinders (2.1) to be used is determined according to the volume of the overpressure chamber of the civil air defense door.

Images