Pressurizing system for detecting airtightness of civil air defense door

Abstract

The invention relates to a pressurization system 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 mode, 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 present invention relates to the technical field of civil air defense engineering, and in particular to a pressurizing system for detecting the tightness of civil air defense doors. Background Art

[0002] Civil defense doors are the entrances and exits of civil defense projects. They are important protective equipment that blocks or weakens shock waves and blocks the entry of biological and chemical agents. Their airtightness directly affects the protective performance of civil defense projects, so the airtightness test of civil 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 Defense Projects (RFJ04-2009)": Protective equipment must be tested for airtightness; under standard air pressure, the overpressure values ​​of single-leaf and double-leaf protective closed doors are 100Pa and 50Pa respectively; during testing, the inflation process should be slow, and the inflation pressure should be read after reaching the set overpressure value and stabilizing. The readings within the range of the set overpressure value to the set overpressure value + 2Pa are valid data, so the stability of inflation and pressurization is related to the success or failure of the test.

[0003] The existing airtightness detection and pressurization system for civil air defense doors is composed of an air compressor, air supply pipeline, valve, differential pressure gauge, flow meter, etc. The air compressor provides pressure medium to enter the detection overpressure chamber through the air supply pipeline, valve, and flow meter; the pressure value of the overpressure chamber is controlled by adjusting the valve opening, and the leakage of the civil air defense door is read by the differential pressure gauge installed on the overpressure chamber. The qualification of the airtightness of the civil air defense door is judged according to Table 4.1.6 of the "Test and Quality Inspection Standard for Civil Defense Engineering Protection 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 is close to 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 "Testing and Quality Inspection Standards 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, and it is difficult to achieve pressure regulation directly by controlling the valve opening. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a pressurizing system for detecting the airtightness of civil defense doors, which overcomes the shortcomings of the prior art, solves the problem of pressure shock fluctuations at the air supply outlet, reduces the technical difficulty of pressure regulation within the range of a set overpressure value to a set overpressure value + 2Pa, and improves the success rate of the test and the test efficiency.

[0006] In order to solve the above technical problems, one of the purposes of the present invention is to provide a pressurizing system for detecting the airtightness of civil air defense doors, which 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 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;

[0008] The slow speed pressure control branch is composed of a gas cylinder 2.1, a high pressure pipeline 2.2, an angle valve 2.3, a bus bar 2.4, a tee 2.5, a front end pressure gauge 2.6, a ball valve 2.7, a pressure reducing valve 2.8, a tee 2.9, a pressure reducing valve outlet pressure gauge 2.10, a needle valve 2 2.11 and a flow meter 2.12, and is used to achieve a stable gas supply and precise pressure control for secondary pressurization after the overpressure value 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 fast pressure building branch and the slow pressure control branch merge into the tee 2.13, and the other outlet of the tee 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 a high-pressure hose 2.2 and an angle valve 2.3, the outlet of the bus 2.4 is connected to the ball valve 2.7 through a tee 2.5, the front end pressure gauge 2.6 is installed on the tee 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 tee 2.9, the pressure gauge 2.10 is installed on the tee 2.9, the outlet of the needle valve 2.11 is connected to the digital flowmeter 2.12, and the digital flowmeter 2.12 enters the overpressure chamber through the tee 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 the 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 requirements of Article 4.3.2 of the "Test and Quality Inspection Standard for Civil Protection Engineering Protection Equipment (RFJ04-2009)" "… the reading within the range of the set overpressure value to the set overpressure value + 2Pa is 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 pressurization system of the present invention can also be charged with air by an air compressor for the buffer tank, and the gas branch after the buffer tank can be connected according to 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-bus, 2.5-tee 1, 2.6-front end pressure gauge, 2.7-ball valve, 2.8-two-stage pressure reducing valve, 2.9-tee 2, 2.10-pressure reducing valve outlet pressure gauge, 2.11-needle valve 2, 2.12-digital flowmeter, 2.13-tee 3, 3-low-pressure pipeline, 4-micro differential pressure gauge. Specific implementation plan

[0022] The present invention relates to a pressurizing system for detecting the airtightness of civil air defense doors. The system pressurization is achieved 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 air compressor of the fast pressure building branch are closed; and the pressure is switched to the pressure control 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 system, and a pressure control system. The slow-speed pressure control branch composed of meters and pipelines (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, and the ball valve of the branch, and then slowly adjust the opening of the needle valve of the branch 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 digital flow meter of the branch indicates the actual leakage 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, 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 combination with the embodiments of the present invention and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the obtained embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0024] The pressurization system is composed of the following: Figure 1 As shown. For a better understanding of the present invention, an overpressure chamber, a power supply, a power supply line, a signal line and a secondary instrument are introduced. The DC power supply is used to power the digital flow meter 2.12 and the micro differential pressure gauge 4, and 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 the present invention.

[0025] The pressurization system of the present invention is mainly composed of a fast pressure building branch, a slow pressure control branch, a low pressure pipeline 3, a micro differential pressure gauge 4, etc. The fast pressure building branch is composed of an air compressor 1.1, a needle valve 1.2, and a pipeline 1.3; the slow pressure control branch is composed of a gas cylinder 2.1, a high pressure pipeline 2.2, an angle valve 2.3, a bus 2.4, a tee 2.5, a front pressure gauge 2.6, a ball valve 2.7, a pressure reducing valve 2.8, a tee 2.9, a pressure reducing valve outlet pressure gauge 2.10, a needle valve 2.11, and a digital flow meter 2.12.

[0026] The functions of each main component are as follows: the rapid pressure building branch is used to quickly replenish 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 the pressure is built up quickly, close the ball valve 2.7 and the needle valve 2.11, open the needle valve 1.2, and start the air compressor 1.1; the air compressor outlet pressure gas enters the overpressure chamber through the pipeline needle valve 1.2, the pipeline 1.3, and the low-pressure pipeline 3, and 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 and displays it in the secondary instrument. When the overpressure value shown on the secondary instrument reaches 70% to 80% of the set overpressure value, close the needle valve 1.2 and turn off the air compressor 1.1.

[0029] When controlling the pressure slowly, first confirm that needle valves 1.2, 2.11 and ball valve 2.7 are closed; determine the number of gas cylinders to be opened according to 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, and the gas in the gas cylinder enters the bus 2.4 through the high-pressure pipeline 2.2 and angle valve 2.3, and the front-end pressure gauge 2.6 installed on the tee 2.5 displays the current gas pressure value in the bus; then open the ball valve 2.7, and the gas enters the needle valve 2 2.11 through the ball valve 2.7 and the two-stage pressure reducing valve 2.8, and the pressure reducing valve outlet pressure gauge 2.10 installed on the tee 2.9 displays the outlet pressure of the two-stage pressure reducing valve 2.8. Adjusting the two-stage pressure reducing valve 2.8 can change its outlet pressure after pressure reduction 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 flow meter 2.12 and low-pressure pipeline 3. When the overpressure value shown on the secondary instrument is lower than the set overpressure value, appropriately increase the opening of needle valve 2.11. When the overpressure value is higher than the set overpressure value, appropriately reduce the opening of needle valve 2.11. Stop adjusting needle valve 2.11 when the overpressure value shown on the secondary instrument is within the range of the set overpressure value to the set overpressure value + 2Pa and can be maintained. At this time, the value shown by the digital flowmeter 2.12 is the actual leakage of the civil 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 drain the gas in the bus 2.4 and all pipelines.

[0031] To make the technical solutions and advantages of the present invention more clear, Figure 1The embodiments of the present invention are described in full and in detail. A pressurization system for airtightness detection of civil air defense doors comprises two branches, namely, a rapid pressure building and a slow pressure control, which are organically combined and work in time-sharing manner.

[0032] The connection relationship between the components described in this solution can be any one or a combination of threaded interface, flange interface, welding interface or pneumatic quick interface. The connection interface method is a common sense issue in the industry and does not affect the specific implementation effect of the present invention. The following focuses on the connection sequence of the components that affect the operation of the system.

[0033] The fast pressure building branch and the slow pressure control branch merge into the tee 2.13, and the other outlet of the tee 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 hose 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 tee 2.5, and the front-end pressure gauge 2.6 is installed on the tee 2.5, and the other outlet of the tee 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, and the two-stage The low-pressure port of the pressure reducing valve 2.8 is connected to one port of the tee 2.9; the pressure gauge 2.10 is installed on one port of the tee 2.9; the other port of the tee 2.9 is connected to the air inlet of the needle valve 2.11; the outlet of the needle valve 2.11 is connected to the air inlet of the digital flowmeter 2.12; the outlet of the digital flowmeter 2.12 is connected to one port of the tee 2.13; the measuring port of the micro differential pressure gauge 4 is connected to the pressure measuring port of the overpressure chamber, and the power supply supplies power to the digital flowmeter 2.12 and the micro differential pressure gauge 4 at the same time, and the overpressure chamber pressure signal measured by the micro differential pressure gauge 4 is displayed through the secondary instrument.

[0034] The physical form of the specific implementation of the present invention is not unique, but it does not affect the specific effect of the present invention. The specific embodiment of the present invention (the rapid pressure building branch is omitted). The general practice is to integrate multiple gas cylinders 2.1, high-pressure hoses 2.2, angle valves 2.3, and busbars 2.4 into one (assuming it is named A), and integrate three-way valves 2.5, pressure gauges 2.6, ball valves 2.7, pressure reducing valves 2.8, three-way valves 2.9, pressure gauges 2.10, needle valves 2.11, and flow meters 2.13 into a hard pipeline (assuming it is named B), and finally integrate A and B on a frame, and then the two branches are combined to supply gas to the overpressure chamber through the low-pressure pipeline 3.

[0035] Obviously, those skilled in the art can 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 these 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 also intended to include these modifications and variations.

[0036] The invention has been successfully used for the airtightness detection of composite material civil air defense doors of multiple series and multiple models of door holes. 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 tee 1 (2.5), a front end pressure gauge (2.6), a ball valve (2.7), a pressure reducing valve (2.8), a tee 2 (2.9), a pressure reducing valve outlet pressure gauge (2.10), a needle valve 2 (2.11) and a flow meter (2.12), and is used to realize a stable gas supply and precise pressure control for 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 airtightness 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 specially used to supply power to the digital display 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).

3. The pressurizing system for detecting airtightness 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 tee 3 (2.13), and the other outlet of the tee 3 (2.13) is connected to the air inlet of the overpressure chamber through a low-pressure pipeline (3).

4. The pressurizing system for detecting airtightness 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 pipeline needle valve (1.2), the pipeline (1.3) and the low-pressure pipeline (3).

5. The pressurizing system for detecting airtightness 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 a high-pressure hose (2.2) and an angle valve (2.3); the outlet of the busbar (2.4) is connected to the ball valve (2.7) through a tee 1 (2.5); a front-end pressure gauge (2.6) is installed on the tee 1 (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 a tee 2 (2.9); the pressure gauge (2.10) is installed on the tee 2 (2.9); the outlet of the needle valve (2.11) is connected to a digital flow meter (2.12); the digital flow meter (2.12) enters the overpressure chamber through a tee 3 (2.13) and a low-pressure pipeline (3).

6. The pressurizing system for detecting airtightness of civil air defense doors according to claim 1 is 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.

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