Smoke type airtight door airtightness detection device

Abstract

The utility model relates to the field of air tightness detection, in particular to a smog type air tightness detection device for an air-tight door, which comprises an outer sealing cover and an inner sealing cover which are arranged on two sides of a door frame wall in a covering manner and are fixed with the door frame wall in an adsorption manner, and a positive pressure sealing cavity is enclosed by the outer sealing cover, the door frame wall and the air-tight door on the door frame wall. The air source and the micromanometer are communicated with the positive pressure sealing cavity, and the positive pressure sealing cavity is further connected with a smoke generator used for generating smoke; a negative pressure sealing cavity is defined by the inner sealing cover, the door frame wall and the air-tight door, and the negative pressure sealing cavity is vacuumized through a vacuum pump. According to the utility model, the air tightness detection time of the air-tight door of the civil air defense space is greatly shortened, and the leakage points of the air-tight door can be accurately checked.

Description

Technical Field

[0001] This utility model relates to the field of airtightness testing, specifically a smoke-type airtight door airtightness testing device. Background Technology

[0002] The airtightness of the sealed doors in civil defense spaces is of paramount importance. In wartime, they can prevent the infiltration of toxic gases and block the overpressure of shock waves. Therefore, during the construction phase, it is necessary to test and verify the airtightness of the sealed doors to ensure that the leakage rate meets national standards under a pressure difference of 50Pa.

[0003] The current standard testing method for the airtightness of airtight doors in civil defense spaces is positive pressure testing. During the test, the airtight door is first closed and locked to ensure that the sealing strip on the airtight door is evenly pressurized. Air is injected into the civil defense space through the test interface reserved in the civil defense space (or temporary drilling hole) and pressurized to the set value. After stabilization, the initial pressure is recorded. The pressure is maintained for 5 to 10 minutes, and the pressure drop is observed to see if it meets the standard.

[0004] This positive pressure testing method has the following problems: 1. Due to the extremely large size of the air-raid shelter, a long time needs to be reserved before testing to pressurize the air-raid shelter and bring it to the set pressure value, which takes a very long time; 2. During the testing phase, even if an abnormal pressure drop is detected in the air-raid shelter, since air-raid shelters are usually equipped with multiple sets of airtight doors, it is impossible to determine which airtight door or which area has a problem with airtightness, making it impossible to conduct an accurate investigation. Therefore, this problem urgently needs to be solved. Utility Model Content

[0005] To avoid and overcome the technical problems existing in the prior art, this utility model provides a smoke-type airtight door airtightness detection device. This utility model significantly shortens the airtightness detection time of airtight doors in air-raid shelters and can accurately identify the leakage points of airtight doors.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A smoke-type airtight door airtightness testing device includes an outer sealing cover and an inner sealing cover that are attached to both sides of the door frame wall and fixed to the door frame wall by adsorption. The outer sealing cover, the door frame wall, and the airtight door on the door frame wall enclose a positive pressure sealing cavity. An air source and a micro-manometer are connected to the positive pressure sealing cavity. The positive pressure sealing cavity is also connected to a smoke generator for generating smoke. The inner sealing cover, the door frame wall, and the airtight door enclose a negative pressure sealing cavity, which is evacuated by a vacuum pump.

[0008] As a further embodiment of this utility model: a camera is fixed on one side of the inner sealing cover adjacent to the airtight door, and the camera ranges of each camera overlap to cover the gap area between the airtight door and the door frame wall.

[0009] As a further improvement of this utility model, the inner sealing cover is a transparent cover.

[0010] As a further improvement of this utility model: sealing strips are provided at the contact surfaces of the outer sealing cover and the inner sealing cover with the door frame wall. The sealing strips include an outer sealing strip and an inner sealing strip located in the inner ring of the outer sealing strip. The outer sealing strip and the inner sealing strip enclose a negative pressure cavity. Negative pressure connectors for evacuating the negative pressure cavity are provided on both the outer sealing cover and the inner sealing cover.

[0011] As a further improvement of this utility model: a gas source pipeline connected to the gas source is pre-embedded on the outer sealing cover, and a gas source regulating valve, a pressure gauge, a flow regulating valve and a flow meter are sequentially arranged on the gas source pipeline along the gas delivery direction; a pressure measuring tube connected to a micro pressure gauge is pre-embedded on the outer sealing cover.

[0012] As a further improvement of this utility model: the smoke generator is a dry ice machine, and the exhaust pipe of the dry ice machine is connected to the gas source pipe.

[0013] As a further embodiment of this utility model: the inlet of the gas source pipeline corresponds to the center point of the airtight door, and a diffuser plate is coaxially fixed at the inlet of the gas source pipeline in the positive pressure sealing cavity. The axis of the diffuser plate is arranged along the direction perpendicular to the airtight door, and diffuser joints are evenly arranged radially inside the diffuser plate. The exhaust gas from the gas source pipeline is evenly diffused into the positive pressure sealing cavity through each diffuser joint of the diffuser plate.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model, through the cooperation of inner and outer sealing covers with the door frame wall and airtight door, forms two narrow sealed cavities. By injecting air into the positive pressure sealing cavity to increase pressure, a positive pressure environment can be quickly formed in a short time, eliminating the need for prolonged air filling of the air-raid shelter and significantly shortening the airtightness testing time. By evacuating air from the inner sealing cavity to reduce pressure, a negative pressure cavity is formed, which increases pressure on one side of the airtight door while decreasing pressure on the other. Under the action of bidirectional dynamic pressure difference, smoke will be driven by a greater pressure difference to more easily and quickly pass through the positive pressure sealing cavity from the leakage point and enter the negative pressure sealing cavity. By observing where the smoke is leaking from in the negative pressure sealing cavity, the leakage area can be quickly determined, and the leakage point of the airtight door can be accurately located. After determining the leakage point, the inner sealing cover is removed, and the leakage amount per unit time can be calculated based on the readings of the micro-manometer and the flow meter, thereby determining whether it meets the airtightness standard.

[0016] 2. The outer sealing strip and the inner sealing strip of this utility model form a negative pressure cavity structure. The negative pressure is generated by active suction by a vacuum pump, which enhances the bonding pressure between the inner and outer sealing covers and the door frame wall, and prevents the gas in the sealing cavity from leaking from the sealing strip, thus affecting the measurement accuracy of airtightness.

[0017] 3. This utility model makes it easier to expose tiny leaks by using a higher pressure difference. The active suction on the negative pressure side can concentrate the flow of smoke, making it easier to locate the leak. By setting the inner sealing cover to be transparent or installing a camera on the inner sealing cover, the leak point can be directly observed or recorded.

[0018] 4. The gas source pipe and pressure measuring pipe of this utility model are pre-embedded in the sealing cover, which is set up as an integral unit to avoid the installation of pipe interfaces and further reduce the risk of leakage on the sealing cover; the exhaust pipe of the dry ice machine is connected to the gas source pipe, so that the smoke can directly enter the sealing cover with the pressurized air. The smoke is evenly diffused into the positive pressure sealing cavity through the diffuser plate, avoiding uneven distribution of smoke from affecting subsequent processes. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] In the picture:

[0021] 1. Airtight door; 2. Door frame wall; 3. Diffuser plate; 31. Diffuser connector;

[0022] 4. Air source; 41. Air source regulating valve; 42. Pressure gauge;

[0023] 43. Flow regulating valve; 44. Flow meter; 45. Gas source pipeline;

[0024] 5. Micromanometer; 51. Pressure measuring tube; 6. Outer sealing cover; 7. Inner sealing cover;

[0025] 71. Camera; 72. Vacuum pump; 8. Sealing strip; 81. Negative pressure connector; 9. Smoke generator. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1 In this embodiment of the invention, a smoke-type airtight door airtightness testing device is provided. The airtight door 1 is fixed on the door frame wall 2. During testing, an outer sealing cover 6 and an inner sealing cover 7, corresponding to the shape of the outer ring of the door frame wall 2, are respectively placed on both sides of the door frame wall 2. The outer sealing cover 6, the door frame wall 2, and the airtight door 1 enclose a positive pressure sealing cavity, while the inner sealing cover 7, the door frame wall 2, and the airtight door 1 enclose a negative pressure sealing cavity.

[0028] The outer sealing cover 6 and the inner sealing cover 7 are sealed to the door frame wall 2 by a sealing strip 8. The sealing strip 8 includes an outer sealing strip and an inner sealing strip that is proportionally reduced in size within the inner ring of the outer sealing strip. The outer sealing strip and the inner sealing strip enclose a negative pressure cavity. Both the outer sealing cover 6 and the inner sealing cover 7 are provided with a negative pressure connector 81 that communicates with the negative pressure cavity. The negative pressure connector 81 is connected to a vacuum pump. After the cover is fixed, the negative pressure cavity is drawn into a negative pressure state through the negative pressure connector 81, thereby achieving the adsorption-type fixation of the sealing cover.

[0029] The outer sealing cover 6 is made of cast epoxy resin material. During casting, the gas source pipe 45 and the pressure measuring pipe 51 are pre-embedded inside the outer sealing cover 6. This pre-embedded arrangement avoids gaps between the pipes and the outer sealing cover 6 that could cause leakage. The gas source pipe 45 is connected to a gas source 4, and the pressure measuring pipe 51 is connected to a micro pressure gauge 5. The micro pressure gauge 5 measures the gas pressure inside the sealing cavity, and gas is injected into the sealing cavity through the gas source pipe 45 to increase the pressure. Along the gas delivery direction, the gas source pipe 45 is sequentially equipped with a gas source regulating valve 41, a pressure gauge 42, a flow regulating valve 43, and a flow meter 44.

[0030] The exhaust pipe of the smoke generator 9 is connected to the air source pipe 45, and the smoke is synchronously transported into the positive pressure sealed chamber along with the air in the air source pipe 45. The smoke generator 9 is preferably a dry ice machine.

[0031] During the airtightness test, a positive pressure environment is created by first filling the positive pressure sealing cavity with air and then introducing smoke through the air source pipe 45. A negative pressure environment is then created in the negative pressure sealing cavity using a vacuum pump 72. Under the pressure difference between the two sides, smoke enters the negative pressure sealing cavity from the positive pressure sealing cavity along the leakage point of the sealed door 1. The location of the leakage point of the sealed door 1 can be observed by installing a high-definition camera 71 on the inner sealing cover 7, or by making the inner sealing cover 7 a transparent cover. The overlapping camera ranges of each camera 71 cover the gap area between the sealed door 1 and the door frame wall 2.

[0032] After determining the location of the leak, the inner sealing cover 7 is removed, leaving only the outer sealing cover 6. The leakage rate per unit time can be calculated based on the readings of the micro-manometer and the flow meter, thereby determining whether the airtight door 1 meets the airtightness standard.

[0033] To achieve uniform smoke diffusion, a diffuser plate 3 is coaxially fixed at the inlet of the gas source pipe 45 within the positive pressure sealing cavity. The axis of the diffuser plate 3 is arranged perpendicular to the sealing door 1. Diffuser joints 31 are evenly arranged radially inside the diffuser plate 3. The exhaust gas from the gas source pipe 45 is evenly diffused into the positive pressure sealing cavity through the diffuser joints 31 of the diffuser plate 3. The joints of the diffuser plate 3 are connected to the gas source pipe 45, and the flow at the joints of the diffuser plate 3 is divided into multiple sets of channels of equal diameter, each channel connecting to the corresponding diffuser joint 31.

[0034] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0035] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

Claims

1. A smoke-type sealed door airtightness detection device, characterized in that, It includes an outer sealing cover (6) and an inner sealing cover (7) that are installed on both sides of the door frame wall (2) and are fixed to the door frame wall (2) by adsorption. The outer sealing cover (6), the door frame wall (2) and the airtight door (1) on the door frame wall (2) form a positive pressure sealing cavity. The gas source (4) and the micro pressure gauge (5) are connected to the positive pressure sealing cavity. The positive pressure sealing cavity is also connected to a smoke generator (9) for generating smoke. The inner sealing cover (7), the door frame wall (2) and the airtight door (1) form a negative pressure sealing cavity. The negative pressure sealing cavity is evacuated by a vacuum pump (72).

2. The smoke-type airtight door airtightness detection device according to claim 1, characterized in that, A camera (71) is fixed on one side of the inner sealing cover (7) adjacent to the airtight door (1). The camera ranges of each camera (71) overlap and cover the gap area between the airtight door (1) and the door frame wall (2).

3. The airtightness testing device for a smoke-type sealed door according to claim 1, characterized in that, The inner sealing cover (7) is a transparent cover.

4. A smoke-type sealed door airtightness testing device according to any one of claims 1 to 3, characterized in that, Sealing strips (8) are provided at the contact surfaces of the outer sealing cover (6) and the inner sealing cover (7) with the door frame wall (2). The sealing strip (8) includes an outer sealing strip and an inner sealing strip located in the inner ring of the outer sealing strip. The outer sealing strip and the inner sealing strip enclose a negative pressure cavity. Negative pressure connectors (81) for evacuating the negative pressure cavity are provided on both the outer sealing cover (6) and the inner sealing cover (7).

5. A smoke-type airtight door airtightness testing device according to any one of claims 1 to 3, characterized in that, An air source pipe (45) connected to the air source (4) is pre-embedded on the outer sealing cover (6). Along the gas delivery direction, an air source regulating valve (41), a pressure gauge (42), a flow regulating valve (43), and a flow meter (44) are sequentially installed on the air source pipe (45). A pressure measuring tube (51) connected to the micro pressure gauge (5) is pre-embedded on the outer sealing cover (6).

6. The smoke-type airtight door airtightness detection device according to claim 5, characterized in that, The smoke generator (9) is a dry ice machine, and the exhaust pipe of the dry ice machine is connected to the gas source pipe (45).

7. The airtightness testing device for a smoke-type sealed door according to claim 6, characterized in that, The opening of the gas source pipe (45) corresponds to the center point of the airtight door (1). A diffuser plate (3) is coaxially fixed at the opening of the gas source pipe (45) in the positive pressure sealing cavity. The axis of the diffuser plate (3) is arranged in the direction perpendicular to the airtight door (1). Diffuser joints (31) are evenly arranged radially inside the diffuser plate (3). The exhaust gas from the gas source pipe (45) is evenly diffused into the positive pressure sealing cavity through each diffuser joint (31) of the diffuser plate (3).

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