Building airtightness detection method

Abstract

The building airtightness detection method disclosed by the present invention includes the following steps: obtaining the air leakage value of the space to be tested and locating the air leakage rooms in the space to be tested; using a leak detection device to conduct a full-process leak detection on the wall corners of the air leakage rooms and screening out the non-air leakage wall corners; then conducting a second-half process leak detection on the air leakage wall corners of the air leakage rooms to determine the specific air leakage areas; placing a fixed-point leak detector in the specific air leakage areas to determine and mark the specific air leakage positions; plugging or repairing the specific air leakage positions; and using the fixed-point leak detector again for inspection until it is qualified. By means of the method of zoning and isolation, the present invention quickly locates the air leakage rooms, then directly conducts full-process and second-half process leak detections on the wall corners of the air leakage rooms by using a leak detection device. After determining the air leakage areas of the wall corners, the specific air leakage positions are finally accurately located by a fixed-point leak detector, avoiding the process of personnel scanning each seam one by one, greatly improving the work efficiency of the testing personnel, and having clear signals obtained during the detection process and a low misjudgment probability.

Description

Technical Field

[0001] The present invention belongs to the technical field of nearly zero - energy consumption buildings, and particularly relates to a method for detecting building airtightness. Background Art

[0002] The "Technical Standard for Nearly Zero - Energy Consumption Buildings" GB / T 51350 - 2019 (hereinafter referred to as the "Standard") is one of the important national standards issued in 2019. The "Standard" closely combines China's climate characteristics, building types, energy - using characteristics and development trends, widely draws on and absorbs the advanced experience of developed countries, deeply studies the nearly zero - energy consumption building demonstration projects completed in China, provides a technical basis for China to achieve higher indoor environmental comfort and energy - saving goals, and provides technical support for the design, construction, detection, evaluation, commissioning and operation and maintenance of nearly zero - energy consumption buildings in China. It has important guiding significance for the gradual improvement of China's mandatory building energy - saving standards in the medium - and long - term future (2025 - 2035 - 2050). It first defines relevant concepts such as ultra - low - energy consumption buildings, nearly zero - energy consumption buildings, and zero - energy consumption buildings in China, clarifies the binding control indicators including indoor environmental parameters and building energy - consumption indicators, proposes corresponding technical performance indicators, technical measures and evaluation methods, develops calculation and evaluation tools for nearly zero - energy consumption buildings, and will play an important role in standardizing the ultra - low - energy consumption building and nearly zero - energy consumption building markets, improving the design level, promoting energy conservation and emission reduction, improving the working and living environment, and guiding the improvement of relevant engineering standards and product standards. The "Standard" first clearly puts forward the requirements for building airtightness, and puts forward the standards for airtightness determination and testing methods in the form of standard articles. The airtightness standards can be seen in Articles 5.0.1 (residential buildings) and 5.0.2 (public buildings).

[0003] Appendix E of the "Standard" proposes corresponding testing methods, which put forward requirements for the test pressure, leak detection and calculation methods. However, in engineering practice, some deficiencies have been found in the application of this method, specifically the following two points:

[0004] (1) Appendix E.1.3 of the "Standard" determines the building leakage source by using an infrared thermal imager and a smoke generator at the same time. In practical applications, in seasons when the temperature difference between indoors and outdoors is not obvious, the significance of observing air leakage with an infrared thermal imager is not great. Heating indoors on a large scale causes an increase in energy consumption and it is necessary to test outside the building, which is very difficult for high-rise buildings. In practical applications, an infrared thermal imager is also easily affected by sunlight, resulting in inaccurate measurements. Reflections, sunlight, and lights reflected by wall coatings may all cause misjudgments. Generally, the efficiency is low and there are many errors. Using a smoke generator is even more unrealistic. The colored smoke test in residential buildings is likely to cause pigment precipitation and pollute the walls, windows, and furniture. It is difficult to observe white smoke whether it is day or night. At the same time, the smoke released by the smoke generation method usually has a certain amount of heat, and the hot smoke has the characteristic of rising vertically under the action of density difference. It is difficult to detect the leakage parts of the side wall details during the practice of using the rising smoke for leak detection, resulting in misjudgments.

[0005] (2) Appendix E.1.5 of the "Standard" requires that the test be carried out for each household. At present, the construction cost of ultra-low energy consumption buildings is much higher than that of conventional buildings. Most of them are large-sized apartments with an area of more than 100 square meters, and the external wall area is large. To measure each household and find the leakage points with existing technologies, there are problems such as a long test cycle, a large number of test personnel, and high test costs. This part of the construction period and costs also seriously affect the promotion and marketization of ultra-low energy consumption, an energy-saving building.

[0006] In addition, it is also found in engineering practice that since the cementitious material in cement binds the aggregates into an integral engineering composite material and the self-gravity and vibration effects in the vertical direction make the concrete wall structure dense, there is rarely air leakage in the wall itself. Therefore, the wall corners are the main parts where air leakage may occur. Due to the pouring process at the wall corners not necessarily being continuous, and some air may be mixed into the concrete material at the joints. In addition, the concrete wall expands and contracts due to temperature changes. These factors may combine to produce gaps here. Summary of the Invention

[0007] The purpose of the present invention is to provide a method for detecting building airtightness, which solves the problems of low efficiency and easy misjudgment of existing detection methods.

[0008] The technical solution adopted by the present invention is: a method for detecting building airtightness, including the following steps:

[0009] Step 1: Obtain the air leakage value of the space to be tested and locate the air leakage room in the space to be tested;

[0010] Step 2: Use a leak detection device to conduct a full-process leak detection on the wall corners of the air leakage room and screen out the non-air leakage wall corners;

[0011] Step 3: Use a leak detection device to conduct a lower-half process leak detection on the air leakage wall corners of the air leakage room to determine the specific air leakage area;

[0012] Step 4: Place the fixed-point leak detector in the specific air leakage area, determine the specific air leakage position and mark it;

[0013] Step 5: Block or repair the specific air leakage position;

[0014] Step 6: Use the fixed-point leak detector again to check whether the blocked or repaired position leaks air until it is qualified.

[0015] The features of the present invention also lie in that,

[0016] Specifically, Step 1 is as follows: Close all doors and windows communicating with the outside in the space to be tested, use a building airtightness test system to test the overall airtightness of the space to be tested. If there is air leakage, close each interior door in the space to be tested one by one, and locate the air leakage room by the method of partition isolation.

[0017] The main body of the leak detection device used in Step 2 is composed of parallel and slidable L-shaped upper and lower enclosing plates to form upper and lower angular enclosing plate structures. The lower end of the upper enclosing plate and the upper end of the lower enclosing plate are respectively embedded with U-shaped sealing strips, namely the U-shaped sealing strip at the lower end of the upper enclosing plate and the U-shaped sealing strip at the upper end of the lower enclosing plate. And adjacent to the sealing strips, soft magnetic sheets are respectively fixed, namely the soft magnetic sheet of the upper enclosing plate and the soft magnetic sheet of the lower enclosing plate, to ensure the seal between the upper and lower enclosing plates; sealing strips are provided at the top and bottom ends of the upper enclosing plate and the top and bottom ends of the lower enclosing plate, and on both sides of the upper enclosing plate and both sides of the lower enclosing plate. A diaphragm pressure gauge communicating with the inside and outside is provided on the upper part of the upper enclosing plate. At the inner sides of the angles at the top end and the bottom end of the upper enclosing plate and the bottom end of the lower enclosing plate, an upper end plate and a lower end plate are respectively fixedly covered. A longitudinal strut mechanism is arranged between the upper end plate and the lower end plate; the strut mechanism includes a hollow lower strut fixed at the lower end on the lower end plate. The top end of the lower strut is fixedly sleeved with a horizontal U-shaped gear rack. The two ends of the U-shaped gear rack extend to one side of the lower strut and are jointly connected with a gear shaft. One end of the gear shaft is coaxially fixedly connected with a handwheel located outside the U-shaped gear rack. One side of the top end of the lower strut is open and coaxially sleeved with an upper strut. The bottom end of the upper strut is provided with a rack section corresponding to the opening at the top end of the lower strut. The teeth of the rack section mesh with the gear of the gear shaft. The top end of the upper strut passes upward through the upper end plate. Threaded sections are respectively opened at the top end and the middle of the upper strut. Below the bottom end of the upper end plate, a nut cooperating with the threaded section is provided. A threaded hole is opened in the side wall of the nut along the radial direction and is threadedly connected with a locking wrench; The specific steps for using the leak detection device to conduct a full-process leak detection on the wall corner of the air leakage room are as follows:

[0018] Step 2.1: Place the leak detection device at the wall corner to be tested, make the folding line positions of the upper enclosing plate and the lower enclosing plate face the wall corner line, overcome the resistance of the sealing strips and soft magnetic sheets between the upper enclosing plate and the lower enclosing plate, and make the upper enclosing plate and the lower enclosing plate respectively abut against the top plate and the bottom plate at the wall corner to be tested;

[0019] Step 2.2, press the upper support rod and the lower support rod toward the corner of the wall to be tested, so that the sealing strips on both sides of the upper and lower panels are close to the two sides of the corner of the wall to be tested, and rotate the hand wheel to make the upper support rod support the top plate, so that the sealing strip at the bottom end of the lower panel is sealed with the bottom plate; after rotating the nut to make the upper end plate support the top plate, rotate the locking wrench to fix the relative position of the nut and the upper support rod, so that the sealing strip at the top end of the upper panel is sealed with the top plate; after completing step 2.2, a closed space is formed between the leak detection device and the corner of the wall to be tested;

[0020] Step 2.3, observe the diaphragm box pressure gauge to determine whether the enclosed space is leaking. If not, the tightness of the wall corner to be tested is qualified; if leaking, the tightness of the wall corner to be tested is unqualified, and proceed to step 3 to determine the specific leakage area.

[0021] The specific steps for using a leak detection device to conduct a second half leak detection on the corner of the leaky wall in the leaky room are as follows:

[0022] Step 3.1, reverse the locking wrench, reverse the nut to make it disengage from the threaded section at the top of the upper support rod and connect the nut to the threaded section in the middle of the upper support rod, and rotate the locking wrench again to fix the relative position of the nut and the upper support rod;

[0023] Step 3.2, reverse the hand wheel to make the upper support rod separate from the top plate;

[0024] Step 3.3, pull down the upper end plate and place it on the top of the nut;

[0025] Step 3.4, press the upper support rod and the lower support rod toward the corner of the wall to be tested, so that the sealing strips on both sides of the upper and lower panels are closely attached to the two sides of the lower half of the corner of the wall to be tested;

[0026] Step 3.5, rotate the hand wheel to make the upper support rod support the top plate, so that the sealing strip at the bottom end of the lower enclosure plate is sealed with the bottom plate, and the sealing strip at the top end of the upper enclosure plate is sealed with the two sides of the wall corner; after completing step 3.5, a lower half closed space is formed between the leak detection device and the lower half corner of the wall to be tested;

[0027] Step 3.6, observe the diaphragm box pressure gauge to determine whether there is air leakage in the lower half of the enclosed space. If there is no air leakage, the tightness of the lower half of the corner of the wall to be tested is qualified. According to step 4, check the tightness of the upper half of the corner of the wall to be tested to determine the specific leakage location; if there is air leakage, the tightness of the corner of the wall to be tested is unqualified. According to step 4, check the tightness of the entire corner of the wall to be tested to determine the specific leakage location.

[0028] The fixed-point leak detector used in Step 4 includes a housing. At both ends of the housing, there are outwardly connected horn-shaped sound-collecting shells. Inside both ends of the housing, there are drumsticks swingably connected through supports. On the inner side of each drumstick inside the housing, there is a pickup; the method for the specific air leakage position is: place the fixed-point leak detector in the specific air leakage area at the corner of the wall to be tested, move the sound-collecting shell up and down facing the corner line of the wall corner. When the pickup emits the sound of the drumstick swinging and hitting, it is determined that the position directly opposite the sound-collecting shell is the specific air leakage position.

[0029] The beneficial effects of the present invention are as follows: In the building airtightness detection method of the present invention, the air leakage room is quickly located through the method of zoning isolation, and then the leakage detection device is used to directly perform full-process and half-process leakage detection on the wall corners of the air leakage room. After determining the air leakage area of the wall corner, finally, the fixed-point leak detector is used to accurately locate the air leakage position, avoiding the process of personnel scanning each seam one by one, greatly improving the work efficiency of the testers, and the signals obtained during the detection process are clear and the misjudgment probability is low. Brief Description of the Drawings

[0030] Figure 1 is a schematic diagram of the full-process layout state of the leakage detection device used in the building airtightness detection method of the present invention;

[0031] Figure 2 is a schematic diagram of the half-process layout state of the leakage detection device used in the building airtightness detection method of the present invention;

[0032] Figure 3 is a top view of the leakage detection device used in the building airtightness detection method of the present invention;

[0033] Figure 4 is a structural schematic diagram of the fixed-point leak detector used in the building airtightness detection method of the present invention.

[0034] In the figure, 1. upper support rod, 2. locking wrench, 3. top plate, 4. threaded section, 5. upper end plate, 6. rivet, 7. b-type sealing strip, 8. diaphragm pressure gauge, 9. closed space, 10. corner wall, 11. upper enclosure, 12. upper enclosure soft magnetic sheet, 13. lower U-shaped sealing strip at the upper end of the upper enclosure, 14. gear shaft, 15. rack section, 16. lower enclosure, 17. lower support rod, 18. bottom plate, 19. lower end plate, 20. handwheel, 21. lower enclosure soft magnetic sheet, 22. upper U-shaped sealing strip at the lower end of the lower enclosure, 23. sealing strips on both sides of the upper enclosure, 24. sealing strips on both sides of the lower enclosure, 25. setscrew, 26. U-shaped gear rack, 27. nut, 28. drumstick, 29. left pickup, 30. right pickup, 31. sound-collecting shell, 32. support, 33. housing, 34. leaked gas, 35. infiltrated gas, 36. half-process closed space. Detailed Embodiments

[0035] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] The present invention provides a method for detecting the airtightness of a building, comprising the following steps:

[0037] Step 1: Obtain the air leakage value of the space to be measured and locate the air leakage rooms in the space to be measured.

[0038] Specifically: Close all doors and windows in the space to be measured that communicate with the outside world, and use the building airtightness test system of Jiantong Technology (product model: DG1000) to test the overall airtightness of the space to be measured. If there is air leakage, close each interior door in the space to be measured one by one, and locate the air leakage rooms by the method of partition isolation.

[0039] Step 2: Use a leak detection device to conduct a full-process leak detection on the wall corners of the air leakage rooms and screen out the non-air leakage wall corners.

[0040] As Figures 1 to 3 shown, the main body of the leak detection device used is an upper and lower angular enclosure structure composed of parallel and slidable L-shaped upper enclosure plate 11 and lower enclosure plate 16. The lower end of the upper enclosure plate 11 and the upper end of the lower enclosure plate 16 are respectively equipped with U-shaped sealing strips, namely the lower U-shaped sealing strip 13 of the upper enclosure plate and the upper U-shaped sealing strip 22 of the lower enclosure plate. And adjacent to the sealing strips, soft magnetic sheets are respectively fixed, namely the upper enclosure plate soft magnetic sheet 12 and the lower enclosure plate soft magnetic sheet 21, to ensure the seal between the upper and lower enclosure plates; U-shaped sealing strips are respectively embedded on both sides of the upper and lower enclosure plates, namely the upper enclosure plate side sealing strips 23 and the lower enclosure plate side sealing strips 24, and b-shaped sealing strips 7 are respectively embedded at both ends. Therefore, a closed space 9 is formed between the upper and lower enclosure plates and the corner wall 10, and a diaphragm pressure gauge 8 is arranged at the top of the upper enclosure plate 11.

[0041] Both ends of the upper enclosure plate 11 and the lower enclosure plate 16 are respectively fixed with an upper end plate 5 and a lower end plate 19 by rivets 6. In addition to enhancing the rigidity of both ends of the upper and lower enclosure plates, the upper and lower end plates also provide an installation basis for the strut mechanism; the strut mechanism mainly consists of an upper strut 1, a lower strut 17, a nut 27, a locking wrench 2, a gear shaft 14, a handwheel 20, a U-shaped gear rack 26 and a set screw 25; the lower strut 17 is fixed on the lower end plate 19, and a U-shaped gear rack 26 is sleeved on the top of the lower strut. A gear shaft 14 is assembled thereon, and a handwheel 20 is installed at the outer end of the gear shaft. The U-shaped gear rack and the lower strut are fixed by a plurality of set screws 25; both the upper end and the middle of the upper strut 1 are processed with double-headed threaded sections 4, and the lower end is processed with a rack section 15. After the nut 27 is screwed into the threaded section 4 at the top of the upper strut, it passes through the upper end plate 5; the lower rack section 15 of the upper strut 1 passes through the hollow lower strut 17 and forms a gear-rack transmission with the gear on the gear shaft on one side of the top of the lower strut 17; the purpose of using double-headed threads is to facilitate quick adjustment during the full-process leak detection and the lower-half process leak detection of the wall corners of the air leakage rooms and improve the detection efficiency;

[0042] The specific steps for using a leak detection device to detect leaks in the wall corners of a room with air leakage throughout the process are as follows:

[0043] Step 2.1: Place the leak detection device at the wall corner to be measured, overcome the resistance of the sealing strips and soft magnetic sheets between the upper and lower enclosing plates, and make the upper and lower enclosing plates respectively abut against the top plate 3 and the bottom plate 18.

[0044] Step 2.2: Press the upper and lower support rods so that the sealing strips 23 and 24 on both sides of the upper and lower enclosing plates closely adhere to both sides of the wall corner to be measured; rotate the handwheel 20 so that the upper support rod 1 abuts against the top plate 3, thereby ensuring that the b-shaped sealing strip 7 at the bottom of the lower enclosing plate 16 is in a sealed state with the bottom plate 18; rotate the nut 27, after the upper end plate 5 abuts against the top plate 3, rotate the locking wrench 2 to fix the relative position of the nut 27 and the upper support rod 1, thereby ensuring that the b-shaped sealing strip 7 at the top of the upper enclosing plate 11 is in a sealed state with the top plate 3; thus, a closed space 9 is formed between the leak detection device and the wall corner to be measured, and this closed space includes the wall corner to be measured and the spaces between the adjacent walls and the top plate 3 and the bottom plate 18.

[0045] Step 2.3: Observe the diaphragm pressure gauge 8 to determine whether the closed space 9 leaks air. If there is no air leakage, the tightness of the wall corner to be measured is qualified; if there is air leakage, the tightness of the wall corner to be measured is unqualified, and perform the lower half process leak detection on the wall corner to be measured according to Step 3 to determine the specific air leakage area.

[0046] Step 3: Use the leak detection device to perform the lower half process leak detection on the air leakage wall corner of the room with air leakage to determine the specific air leakage area.

[0047] Step 3.1: Reverse the locking wrench 2 of the leak detection device and reverse the nut 27 so that it is in the threaded section 4 in the middle of the upper support rod 1.

[0048] Step 3.2: Reverse the handwheel 20 so that the upper support rod 1 disengages from the top plate 3.

[0049] Step 3.3: Pull down the upper end plate 5 and place it at the top of the nut 27, so that the top surface of the upper enclosing plate 11 reaches half of the height from the wall corner to be measured.

[0050] Step 3.4: Press the upper and lower support rods so that the sealing strips 23 and 24 on both sides of the upper and lower enclosing plates closely adhere to both sides of the lower half process wall corner to be measured.

[0051] Step 3.5: Rotate the handwheel 20 so that the upper support rod 1 abuts against the top plate 3, thereby forming a lower half process closed space 36 between the upper and lower enclosing plates and the wall corner to be measured.

[0052] Step 3.6, observe the diaphragm box pressure gauge 8 to determine whether the lower half of the enclosed space 36 is leaking. If not, the tightness of the lower half of the wall corner to be tested is qualified. According to step 4, the upper half of the wall corner to be tested is leak-checked to determine the specific leakage position; if there is a leak, the tightness of the wall corner to be tested is unqualified. According to step 4, the entire wall corner to be tested is leak-checked to determine the specific leakage position.

[0053] Step 4: Place the fixed-point leak detector in the specific air leakage area, determine the specific air leakage location and mark it.

[0054] like Figure 4 As shown, the fixed-point leak detector used includes a drumstick 28, a left pickup 29, a right pickup 30, a trumpet-shaped sound collecting shell 31, a support 32 and a shell 33.

[0055] Place the fixed-point leak detector within the half-range or full-range range of the corner of the wall to be tested, and move the sound collecting shell 31 up and down facing the corner line of the corner wall 10. When the pickup emits the sound of the drumstick 28 swinging and hitting, the position facing the sound collecting shell 31 is determined to be the specific air leakage position, that is:

[0056] When the left pickup 29 makes a clapping sound, the infiltrating gas 35 infiltrates from the outside into the room;

[0057] When the right pickup 30 makes a clapping sound, the leaking gas 34 leaks from the room to the outside.

[0058] Step 5: Seal or repair the specific air leakage location.

[0059] If it seeps into the room from outside, check the quality of the exterior wall; if it leaks from the room to the outside, check the quality of the interior wall; remove the surface layer of the wall at the marked part, find the holes or evacuation parts in the exterior wall or interior wall, and seal or repair them.

[0060] Step 6: Use the fixed-point leak detector again to check whether there is air leakage at the blocked or repaired position until it passes the test.

[0061] In the above manner, the building air tightness detection method of the present invention quickly locates the air leaking room by the method of partition isolation, and then uses the leak detection device to directly perform full and half leak detection on the wall corner of the air leaking room, and finally accurately locates the air leaking position by the fixed-point leak detector after determining the air leaking area of ​​the wall corner, thereby avoiding the personnel scanning process one by one, greatly improving the work efficiency of the test personnel, and the signal obtained in the detection process is clear, and the probability of misjudgment is low. And the obtained signal has a guiding role in the blocking or repairing process.

Claims

1. Building airtightness detection method, characterized in that, it includes the following steps: Step 1, obtain the air leakage value of the space to be measured and locate the air leakage rooms in the space to be measured; Step 2, use a leak detection device to perform full-process leak detection on the wall corners of the air leakage rooms and screen out non-air leakage wall corners; the leak detection device used includes upper and lower angular enclosing plate structures composed of parallel and slidable L-shaped upper enclosing plate (11) and lower enclosing plate (16), the lower end of the upper enclosing plate (11) and the upper end of the lower enclosing plate (16) are respectively equipped with U-shaped sealing strips, namely the U-shaped sealing strip at the lower end of the upper enclosing plate (13) and the U-shaped sealing strip at the upper end of the lower enclosing plate (22), and soft magnetic sheets, namely the soft magnetic sheet of the upper enclosing plate (12) and the soft magnetic sheet of the lower enclosing plate (21), are respectively fixed adjacent to the U-shaped sealing strips; sealing strips are provided at the top and bottom ends of the upper enclosing plate (11) and the lower enclosing plate (16), and on both sides of the upper enclosing plate (11) and the lower enclosing plate (16), a diaphragm pressure gauge (8) communicating the inside and outside is provided on the upper part of the upper enclosing plate (11), and upper end plates (5) and lower end plates (19) are respectively fixedly covered on the inner sides of the angles at the top end of the upper enclosing plate (11) and the bottom end of the lower enclosing plate (16), and a longitudinal strut mechanism is arranged between the upper end plate (5) and the lower end plate (19); the strut mechanism includes a hollow lower strut (17) fixed at the lower end on the lower end plate (19), a horizontal U-shaped gear rack (26) is fixedly sleeved at the top end of the lower strut (17), both ends of the U-shaped gear rack (26) extend to one side of the lower strut (17) and are jointly connected with a gear shaft (14), one end of the gear shaft (14) is coaxially fixedly connected with a handwheel (20) located outside the U-shaped gear rack (26), one side of the top end of the lower strut (17) is open and a upper strut (1) is coaxially sleeved, a rack section (15) is provided at the bottom end of the upper strut (1) corresponding to the opening at the top end of the lower strut (17), the teeth of the rack section (15) are meshed with the gear of the gear shaft (14), the top end of the upper strut (1) passes upward through the upper end plate (5), threaded sections (4) are respectively provided at the top end and the middle of the upper strut (1), a nut (27) matching the threaded section (4) is arranged below the bottom end of the upper end plate (5), a screw hole is radially opened on the side wall of the nut (27) and a locking wrench (2) is threadedly connected; the specific steps of using the leak detection device to perform full-process leak detection on the wall corners of the air leakage rooms are as follows: Step 2.1, place the leak detection device at the wall corner to be measured, make the folding line positions of the upper enclosing plate (11) and the lower enclosing plate (16) face the wall corner line, overcome the resistance of the sealing strips and soft magnetic sheets between the upper enclosing plate (11) and the lower enclosing plate (16), and make the upper enclosing plate (11) and the lower enclosing plate (16) respectively abut against the top plate (3) and the bottom plate (18) at the wall corner to be measured; Step 2.2, press the upper support rod (1) and the lower support rod (17) in the direction of the corner of the wall to be tested, so that the sealing strips on both sides of the upper enclosure plate (11) and the lower enclosure plate (16) are closely attached to the two sides of the corner of the wall to be tested, rotate the hand wheel (20) to make the upper support rod (1) press against the top plate (3), so that the sealing strip at the bottom end of the lower enclosure plate (16) and the bottom plate (18) are sealed; rotate the nut (27) to make the upper end plate (5) press against the top plate (3), and then rotate the locking wrench (2) to fix the relative position of the nut (27) and the upper support rod (1), so that the sealing strip at the top end of the upper enclosure plate (11) and the top plate (3) are sealed; after completing step 2.2, a closed space (9) is formed between the leak detection device and the corner of the wall to be tested; Step 2.3, observe the diaphragm box pressure gauge (8) to determine whether the closed space (9) is leaking. If there is no air leakage, the tightness of the wall corner to be tested is qualified; if there is air leakage, the tightness of the wall corner to be tested is unqualified, and proceed to step 3 to determine the specific air leakage area; Step 3: Use a leak detection device to perform a leak detection on the corner of the leaky wall in the leaky room to determine the specific leaking area; Step 4: Place the fixed-point leak detector in the specific air leakage area, determine the specific air leakage location and mark it; Step 5: Block or repair the specific air leakage location; Step 6: Use the fixed-point leak detector again to check whether there is air leakage at the blocked or repaired position until it passes the test.

2. The building air tightness detection method according to claim 1, It is characterized in that The step 1 is specifically as follows: closing all doors and windows in the space to be tested that are connected to the outside world, using a building air tightness test system to test the overall air tightness of the space to be tested, and if there is air leakage, closing each indoor door in the space to be tested one by one, and locating the leaking room by zoning and isolating.

3. The building air tightness detection method according to claim 1, It is characterized in that The specific steps of using the leak detection device to perform the second half leak detection on the corner of the leaky wall of the leaky room are as follows: Step 3.1, reverse the locking wrench (2), reverse the nut (27) to disengage the threaded section (4) at the top of the upper support rod (1) and connect the nut to the threaded section (4) in the middle of the upper support rod (1), and rotate the locking wrench (2) again to fix the relative position of the nut (27) and the upper support rod (1); Step 3.2, reverse the hand wheel (20) to separate the upper support rod (1) from the top plate (3); Step 3.3, pull down the upper end plate (5) and place it on the top of the nut (27); Step 3.4, press the upper support rod (1) and the lower support rod (17) in the direction of the corner of the wall to be tested, so that the sealing strips on both sides of the upper enclosure plate (11) and the lower enclosure plate (16) are closely attached to the two sides of the lower half of the corner of the wall to be tested; Step 3.5, rotating the hand wheel (20) to make the upper support rod (1) press against the top plate (3), so that the sealing strip at the bottom end of the lower enclosure plate (16) and the bottom plate (18) are sealed, and the sealing strip at the top end of the upper enclosure plate (11) and the two sides of the wall corner are sealed; after step 3.5 is completed, a lower half closed space (36) is formed between the leak detection device and the lower half corner of the wall to be tested; Step 3.

6. Observe the diaphragm pressure gauge (8) to determine whether there is air leakage in the lower half closed space (36). If there is no air leakage, the tightness of the lower half corner of the wall to be tested is qualified, and the upper half corner of the wall to be tested is leak-tested according to Step 4 to determine the specific air leakage position. If there is air leakage, the tightness of the corner of the wall to be tested is unqualified, and the whole process of the corner of the wall to be tested is leak-tested according to Step 4 to determine the specific air leakage position.

4. The building airtightness detection method according to claim 1, characterized in that the fixed-point leak detector used in Step 4 includes a housing (33), and horn-shaped sound collecting shells (31) are communicated outward at both ends of the housing (33). Drumsticks (28) are swingably connected in the inner parts of both ends of the housing (33) through supports (32), and a pickup is arranged on the inner side of each drumstick (28) in the housing (33). The method for the specific air leakage position is: place the fixed-point leak detector in the specific air leakage area of the corner of the wall to be tested, move the sound collecting shell (31) up and down facing the corner line of the wall corner. When the pickup emits the sound of the drumstick (28) swinging and hitting, it is determined that the position directly opposite to the sound collecting shell (31) is the specific air leakage position.

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