Smoke mixing prevention test auxiliary device and use method thereof

Abstract

The invention provides a smoke mixing prevention test auxiliary device and a use method thereof. The device comprises an air blower; the main box body is of a sealed structure, and an air outlet of the air blower is connected to the first side of the main box body in a sealed mode; the first end of the flue air inlet pipe is connected to the second side of the main box body in a sealed mode, the first side and the second side of the main box body are oppositely arranged, and the second end of the flue air inlet pipe is used for being connected with a flue system in a sealed mode; and the pressure intensity meter is communicated with the flue air inlet pipe and is used for detecting the pressure intensity in the flue air inlet pipe.

Description

TECHNICAL FIELD

[0001] The present disclosure belongs to the technical field of building flue, and relates to an anti-smoke leakage test auxiliary device and a use method thereof. BACKGROUND

[0002] With the rapid development of China's economy, people's attention and pursuit of living environment and living quality continue to improve. The kitchen, as an important part of family life, its hygiene and cleanliness not only affect the indoor environmental quality, but also directly relate to people's dietary health. In the cooking process, the oil fume will be collected by the range hood and then discharged to the flue system of the building, and finally discharged to the outdoor.

[0003] In the field of building construction, the flue design of high-rise buildings usually adopts finished flue. Although this kind of flue can improve construction efficiency and reduce environmental pollution, it also exposes some problems in actual application. Due to the relatively complex structure of the finished flue, errors are prone to occur during installation, such as inaccurate butt joint at the joint between the flue and the kitchen flue, and unfirm connection between the flues. After the construction of the finished flue is completed, due to the relatively closed internal structure, there is a lack of effective detection means to verify its air tightness and smoke exhaust effect. The traditional detection method often needs to find problems after the building is put into use, but at this time it is difficult to carry out effective rectification, which brings inconvenience to residents' life. Once the finished flue fails or has air tightness problems, maintenance work often needs to remove part of the building structure to carry out, which not only increases the maintenance cost, but also may cause damage to the indoor decoration. SUMMARY

[0004] The present disclosure provides an anti-smoke leakage test auxiliary device and a use method thereof, which can effectively solve the above problems.

[0005] The present disclosure is implemented as follows:

[0006] In one aspect, the present disclosure provides an anti-smoke leakage test auxiliary device, which comprises:

[0007] a blower;

[0008] a main box body, which is a sealed structure, and the air outlet of the blower is sealingly connected to the first side of the main box body;

[0009] a flue air inlet pipe, the first end of which is sealingly connected to the second side of the main box body, wherein the first side and the second side of the main box body are oppositely arranged, and the second end of the flue air inlet pipe is used for sealingly connecting with the flue system;

[0010] a pressure gauge, which is in communication with the flue air inlet pipe and is used for detecting the pressure in the flue air inlet pipe.

[0011] In another aspect, the present disclosure provides a method for using the above-mentioned device, comprising:

[0012] sealingly connecting the second end of the flue air inlet pipe to the flue system of the building;

[0013] turning on the switch of the air blower to start air blowing by the air blower;

[0014] after the air blower has been running for a certain period of time, observing the value of the pressure gauge, if the value of the pressure gauge is stable within the preset range, it is determined that the air tightness of the flue system of the building meets the requirements; if the value of the pressure gauge fluctuates or is lower than the preset range, it is determined that there is a construction quality problem in the flue system of the building.

[0015] In another aspect, the present disclosure provides a method for using the above-mentioned device, comprising:

[0016] sealingly connecting the second end of the flue air inlet pipe to the flue system of the building;

[0017] turning on the switch of the air blower to start air blowing by the air blower;

[0018] putting the smoke generating mechanism into the main box through the smoke releasing cover, sealing the main box, and making the airflow generated by air blowing send the smoke generated by the smoke generating mechanism into the flue system of the building through the flue air inlet pipe;

[0019] observing whether there is smoke leakage at each connection of the flue system of the building and at the flue joint between the flue system of the building and each household of the building, to determine the air tightness of the flue system of the building and the flue joint.

[0020] The present disclosure has the following beneficial effects:

[0021] The present disclosure provides a device for preventing smoke leakage and a method for using the same, which is used for detecting the overall air tightness of the flue system of a building, by connecting the device to the flue system to be detected and turning on the air blower to blow air, so that a certain pressure is maintained in the flue system, and the pressure gauge is used to detect whether there is a construction quality problem in the flue system of the building.

[0022] The device can also detect the air tightness of each connection of the flue system and the flue joint between each household of the building and the flue system, by putting the smoke generating mechanism to generate smoke and sending the smoke into the flue system, simulating the actual living scene of the residents, so as to find out the positions that are not completely sealed, and the detection is highly efficient. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present disclosure, and therefore should not be considered as a limitation to the scope, and other related drawings can also be obtained by those of ordinary skill in the art without creative labor on the basis of these drawings.

[0024] Figure 1 A structural schematic diagram (front view) of the anti-smoke leakage test auxiliary device provided by the embodiments of the present disclosure.

[0025] Figure 2 A structural schematic diagram (top view) of the anti-smoke leakage test auxiliary device provided by the embodiments of the present disclosure.

[0026] Figure 3 A flowchart of the first use method of the anti-smoke leakage test auxiliary device provided by the embodiments of the present disclosure.

[0027] Figure 4 A flowchart of the second use method of the anti-smoke leakage test auxiliary device provided by the embodiments of the present disclosure.

[0028] Reference signs: 1, air blower; 2, first variable cross-section transition pipe; 3, main box body; 31, smoke launching cover; 32, smoke launching connecting pipe; 33, recovery port; 34, handle; 4, second variable cross-section transition pipe; 5, flue inlet pipe; 6, pressure gauge; 7, telescopic variable-diameter transition pipe. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only some of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present disclosure. Therefore, the following detailed description of the embodiments of the present disclosure provided in the drawings is not intended to limit the scope of the claimed present disclosure, but only represents selected embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present disclosure.

[0030] Please refer to Figure 1 and 2 The embodiments of the present disclosure provide an anti-smoke leakage test auxiliary device, which comprises:

[0031] Blower 1. In actual use, different building structures and flue designs may require different air volumes for air tightness testing. The power of the blower 1 can be adjusted so that the device can adjust the output air volume of the blower 1 according to actual needs under different test conditions, which can ensure that the air volume during the test matches the actual use conditions, more accurately simulates various actual use scenarios, and improves the flexibility and accuracy of the device for air tightness testing.

[0032] In some embodiments, the device further comprises a first variable cross-section transition pipe 2. The air outlet of the blower 1 is sealingly connected to the first end of the first variable cross-section transition pipe 2, the second end of the first variable cross-section transition pipe 2 is sealingly connected to the first side of the main box body 3, and the cross-sectional area of the first variable cross-section transition pipe 2 gradually increases along the airflow direction. Such a structure helps to optimize the process of airflow entering the main box body 3 from the blower 1, and improves the overall operating efficiency.

[0033] The design of the first variable cross-section transition pipe 2 allows the airflow to accelerate and diffuse smoothly before entering the main box body 3. This gradual change in cross-section helps to reduce turbulence and resistance of the airflow, ensuring that the airflow enters the main box body 3 more uniformly. Since the airflow is more stable when entering the main box body 3, the smoke can be more evenly distributed inside the main box body 3, and then uniformly mixed with the airflow, so that the airflow uniformly carries the smoke through the flue inlet pipe 5 into the flue system, ensuring the continuity and uniformity of the smoke during the test, ensuring that each test point can receive enough smoke, thereby more accurately detecting air tightness and improving test efficiency.

[0034] Moreover, when the airflow passes through the gradually expanding pipe, the airflow velocity gradually decreases and the static pressure gradually increases. This pressure change helps to stabilize the airflow direction and reduce the tendency of airflow to flow backward. In the event of a blower stoppage or abnormality, this structure of the first variable cross-section transition pipe 2 can effectively reduce the likelihood of airflow flowing back into the blower.

[0035] For example, the expansion angle of the first variable cross-section transition pipe 2 is 15°-30°, and its length is 30-60 cm, which can effectively control the volume and weight of the pipe body, facilitating installation and use.

[0036] In some embodiments, the connections between the components in the device are connected through connection joints.

[0037] The connection joint is used to sealingly and stably connect each component in the device (such as the blower 1, the main box body 3, the flue inlet pipe 5, the first variable cross-section transition pipe 2, etc.). It ensures the air tightness and structural stability between the components.

[0038] Specifically, the connecting joint can be a flange, a clamp, or the like. The selection of the type of connecting joint depends on factors such as the specific component size, working pressure, and use environment.

[0039] The connecting joint allows the components to be disassembled and reinstalled when necessary, facilitating the maintenance and upgrading of the device.

[0040] The device comprises a main box body 3, which is a sealed structure, and the air outlet of the air blower 1 is sealingly connected to the first side of the main box body 3. The closed space of the main box body 3 is used to accommodate the airflow generated by the air blower and to communicate with the flue inlet pipe.

[0041] In some embodiments, the main box body 3 comprises a smoke injection cover 31 arranged at the top thereof, and the smoke injection cover 31 is provided with a sealed first opening and closing structure. The smoke injection cover 31 communicates with the inside of the main box body 3 through a smoke injection connecting pipe 32, and the smoke injection cover 31 is used to inject a smoke generating mechanism into the inside of the main box body 3 to generate smoke inside it.

[0042] In some embodiments, the opening and closing structure is an opening and closing shutter, which enables the smoke injection cover 31 to switch between the open and closed states. When the opening and closing shutter is closed, a good seal can be formed to ensure the airtightness of the inside of the main box body 3.

[0043] Further, the opening and closing of the opening and closing shutter can be driven by a driving mechanism.

[0044] The smoke injection cover 31 is also provided with a sealing member for ensuring the sealing of the smoke injection cover 31 on the main box body 3 in the closed state, preventing the leakage of airflow or smoke, and ensuring the safety of the operation of the device.

[0045] Specifically, the sealing member can be a sealing ring.

[0046] In some embodiments, the smoke generating mechanism is a smoke bomb.

[0047] In some embodiments, the main box body 3 comprises a spraying mechanism (not shown) arranged inside it. The spraying mechanism is used to extinguish the smoke generating mechanism in an emergency, and to spray liquid to make the smoke settle down, preventing it from escaping to the outside environment. When the smoke bomb generates a large fire, it can be controlled to prevent accidental fires and damage to the main box body 3 and other components. The spraying mechanism adopts a uniform distribution of multiple nozzles to ensure that the liquid can fully cover the inside space of the main box body 3, quickly and effectively extinguishing the smoke.

[0048] In some embodiments, the lower part of one side of the main box 3 is provided with a recovery port 33. The side is the side other than the first side and the second side. The recovery port 33 can be opened and closed by a second opening and closing mechanism. The recovery port 33 is also provided with a sealing member to ensure the sealing of the recovery port 33 on the main box 3 in the closed state, prevent air flow or smoke leakage, and ensure the safety of the operation of the device. The recovery port 33 is provided with a handle 34.

[0049] The recovery port 33 is used to recover the waste smoke generating mechanism, smoke sediment, spraying liquid, and cleaning inside the device.

[0050] The provision of the recovery port 33 allows the operator to conveniently clean the smoke sediment and spraying liquid inside the main box 3, maintain the cleanliness of the device, and prolong the service life of the device. The design of the recovery port 33 can prevent the accumulation of spraying liquid and smoke sediment inside the main box 3, reducing the risk of fire or other safety hazards.

[0051] The smoke dispensing port of the smoke dispensing cover 31 is located high, which is not convenient for recovery operation. The recovery port 33 is provided at the lower part of the side, which allows the operator to more conveniently clean and maintain, reducing the operation difficulty and time cost. The recovery port 33 has functional independence, allowing the operator to separately perform dispensing and recovery operations as needed without mutual interference, which can avoid contamination of the dispensing port, the smoke dispensing cover 31, and the smoke dispensing connecting pipe 32 during recovery, affecting the detection effect. This design improves the flexibility and operation efficiency of the device.

[0052] In some embodiments, the device further comprises a second variable cross-section transition pipe 4. The first end of the second variable cross-section transition pipe 4 is sealingly connected to the second side of the main box 3, the second end of the second variable cross-section transition pipe 4 is sealingly connected to the first end of the flue inlet pipe 5, and the cross-sectional area of the second variable cross-section transition pipe 4 gradually decreases along the airflow direction.

[0053] This tapered design helps to accelerate airflow, making the airflow faster when entering the flue inlet pipe 5, which can increase the kinetic energy of the airflow and increase the static pressure of the airflow, helping to overcome the resistance of the subsequent flue system, ensuring that the airflow can smoothly enter the flue system and reach everywhere. It is particularly useful for flue systems that require higher pressure to push the airflow through long distances or complex flues, thereby saving the output power of the blower 1 and increasing the applicability of the device in high-rise and complex buildings.

[0054] Moreover, the accelerated airflow can better mix the smoke with the airflow again, improve the uniformity of the smoke distribution in the airflow, and ensure that the smoke can be evenly distributed in the entire flue system, thereby improving the accuracy and reliability of the detection.

[0055] For example, the second variable cross-section transition pipe 4 has an expansion angle of 15°-30° and a length of 30-60 cm.

[0056] The device comprises a flue inlet pipe 5. A first end of the flue inlet pipe 5 is sealingly connected to a second side of the main box 3, wherein the first side of the main box 3 is oppositely arranged to the second side. A second end of the flue inlet pipe 5 is used to sealingly connect to a flue system.

[0057] A pressure gauge 6 is in communication with the flue inlet pipe 5 and is used to detect the pressure in the flue inlet pipe 5.

[0058] The flue inlet pipe 5 sealingly connects the main box 3 to the flue system, ensuring that the gas flow from the main box 3 enters the flue system smoothly, avoiding turbulence or leakage of the gas flow when entering the flue system, and enhancing the structural stability of the device, allowing it to withstand certain pressure changes during operation, ensuring the safety and reliability of the device.

[0059] The pressure gauge 6 can be arranged at the top of the flue inlet pipe 5. Preferably, the pressure gauge 6 is arranged near the second end of the flue inlet pipe 5, which can more directly monitor the pressure changes inside the flue system, allowing the pressure gauge 6 to respond more quickly to pressure changes in the flue system and provide more accurate real-time data.

[0060] In some embodiments, the flue inlet pipe 5 comprises a transparent observation part. The transparent observation part can be a part of the flue inlet pipe 5, or the entire flue inlet pipe 5 can be made of transparent material. For example, the transparent observation part is a cylindrical pipe segment made of high-temperature-resistant and corrosion-resistant transparent material, with a length of 20-50 cm. The transparent observation part allows the operator to directly observe the gas flow state, smoke flow condition, and whether there is foreign matter obstruction inside the flue inlet pipe 5, facilitating timely discovery and problem solving.

[0061] Other components of the device should also be made of high-temperature-resistant and corrosion-resistant materials.

[0062] In some embodiments, the device further comprises a telescopic variable-diameter transition pipe 7. The telescopic variable-diameter transition pipe 7 comprises a corrugated pipe segment, a first end of which is sealingly connected to a second end of the flue inlet pipe 5; and a conical sleeve, which is sealingly connected to a second end of the corrugated pipe segment and is used to sealingly connect to the flue system.

[0063] The telescopic variable-diameter transition pipe is made of flexible material resistant to high temperature and corrosion. The corrugated pipe section is telescopic to adapt to the installation requirements of different building chimneys. The inner diameter of the conical sleeve is adjustable to adapt to different sizes of chimney interfaces, achieving reliable sealing effect and preventing air leakage. This design enables the device to flexibly adapt to chimney interfaces of different sizes and positions, ensuring sealing and installation convenience. The conical sleeve is sleeved on the end of the corrugated pipe section and fixedly connected thereto. The inner wall of the connection between the conical sleeve and the corrugated pipe section is provided with an annular sealing groove, and a built-in silica gel sealing ring is arranged. When the two are connected, the silica gel sealing ring can tightly fit the end face of the corrugated pipe section, forming a reliable seal. This design ensures the sealing performance between the telescopic variable-diameter transition pipe components. The sealing connection with the chimney system is achieved through the tight fit of the variable-diameter end of the conical sleeve.

[0064] The diameter of the variable-diameter end can be adjusted by a threaded adjustment method. The variable-diameter end of the conical sleeve is internally provided with threads. By rotating the conical sleeve, the effective diameter thereof is changed by advancing or retreating the threads, thereby adapting to different sizes of chimney interfaces. An adjusting hand wheel is arranged outside the conical sleeve, and an operator adjusts the diameter of the conical sleeve by rotating the adjusting hand wheel.

[0065] For example, the conical sleeve is fixed to the interface of the chimney system by a flange locking mechanism. For example, the axial telescopic amount of the corrugated pipe section is 30-50 cm. For example, the inner diameter adjustment range of the conical sleeve is Φ8-20 cm.

[0066] In some embodiments, the device further comprises a pressure relief valve (not shown). The pressure relief valve is in communication with the chimney inlet pipe 5. The pressure relief valve is used to open when the pressure in the chimney inlet pipe 5 exceeds the preset safety value, to release the excess pressure and ensure the safe operation of the device and the chimney system. The pressure relief valve can be electrically connected with the pressure gauge 6 to monitor the detection value of the pressure gauge in real time, and automatically open when the detection value exceeds the preset safety value.

[0067] The causes of excess pressure include: improper power adjustment of the blower 1, causing the pressure in the chimney inlet pipe 5 to exceed the design range. Or, in the chimney system, due to various reasons (unreasonable chimney design, settlement of the building, impact of external force or other factors causing damage or deformation of the chimney interior, etc.), the airflow passage is narrowed or blocked, so that the airflow cannot pass normally. Such blockage can occur at any part of the chimney, including the elbow, interface, internal accumulations (for example, construction waste, tools or other foreign matter entering the chimney during construction) and other positions.

[0068] Excessive pressure can cause physical damage to the components of the device, affecting its service life. Excessive pressure can also cause leaks between components or at the sealed connection of the device with the flue system, even causing safety accidents such as explosions or fires. During air tightness testing, excessive pressure can also cause the test results to be distorted. The pressure relief valve can restore the pressure of the device to a safe range, thereby protecting the safety of equipment and personnel and ensuring the accuracy and reliability of the testing process.

[0069] Please refer to Figure 1 In some embodiments, the bottom of the main box 3 is fixed on the support table surface by a fixed angle steel.

[0070] Please refer to Figure 1 and 2 In some embodiments, the lower part of the air blower 1 is provided with a switch. The end of the air blower 1 is provided with a power cord.

[0071] Example 2

[0072] Please refer to Figure 3 The present disclosure also provides a use method S100 of the anti-smoke leakage test auxiliary device in embodiment 1, comprising:

[0073] S102, the second end of the flue inlet pipe is sealingly connected with the flue system of the building.

[0074] S104, turn on the switch of the air blower to start the air blower.

[0075] S106, after the air blower runs for a certain period of time, observe the value of the pressure gauge. If the pressure gauge value is stable within the preset range, it is determined that the air tightness of the flue system of the building meets the requirements. If the pressure gauge value fluctuates or is lower than the preset range, it is determined that there is a construction quality problem in the flue system of the building.

[0076] Place the device at the first floor position of the flue system of the building to be tested, and fix the device firmly through the fixed angle steel, and sealingly connect the device with the flue system through the conical sleeve. Turn on the power and operate the air blower switch to start the air blower. Usually after the air blower runs for three minutes, the value of the pressure gauge will be stable within a certain value range, and whether the air tightness of the flue system meets the requirements can be detected through the value of the pressure gauge.

[0077] Please refer to Figure 4 The present disclosure also provides a use method S200 of the anti-smoke leakage test auxiliary device in embodiment 1, comprising:

[0078] S202, the second end of the flue inlet pipe is sealingly connected with the flue system of the building.

[0079] S204, turn on the switch of the air blower to start the air blower;

[0080] S206, put the smoke generating mechanism into the main box through the smoke delivery cover, seal the main box, and send the smoke generated by the smoke generating mechanism into the chimney system of the building through the smoke flue inlet pipe by the airflow generated by the air blower;

[0081] S208, observe whether there is smoke leakage at each connection of the chimney system of the building and at the chimney joint of each household of the building to determine the air tightness of the chimney system of the building and the chimney joint.

[0082] The method S200 can be used in combination with the method S100. That is, after determining the air tightness of the chimney system, further investigate whether there is smoke leakage at each connection.

[0083] Each connection of the chimney system of the building refers to the connection position between each chimney in the chimney system. Specifically, it includes the connection between chimneys installed in sections, the connection between chimneys and branch chimneys, the connection between chimneys and fittings at variable cross-section positions, etc. These connections are key positions in the chimney system. If they are not sealed tightly, the following problems may occur:

[0084] Smoke leakage: affects the smoke exhaust effect and leads to a decrease in kitchen or indoor air quality.

[0085] Smoke mixing: smoke from different households mixes with each other, affecting the quality of life of residents.

[0086] Safety hazards: leaked smoke may contain harmful substances, posing a threat to the health of residents, and even causing fires in extreme cases.

[0087] The above only describes the preferred embodiments of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art can make various modifications and changes to the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A smoke prevention test auxiliary device, characterized in that: The device comprises: Blower; A main box body, wherein the main box body is a sealed structure, and the air outlet of the blower is sealed and connected to the first side of the main box body; a flue air inlet pipe, wherein a first end of the flue air inlet pipe is sealedly connected to the second side of the main housing, wherein the first side and the second side of the main housing are arranged opposite to each other, and the second end of the flue air inlet pipe is used to be sealedly connected to the flue system; A pressure gauge is connected to the flue air inlet pipe and is used to detect the pressure in the flue air inlet pipe.

2. The device according to claim 1, wherein The device further comprises: a first variable cross-section transition pipe; The air outlet of the blower is sealedly connected to the first end of the first variable-section transition pipe, the second end of the first variable-section transition pipe is sealedly connected to the first side of the main box, and the cross-sectional area of ​​the first variable-section transition pipe gradually increases along the airflow direction.

3. The device according to claim 1, wherein The device further comprises: a second variable cross-section transition pipe; The first end of the second variable-section transition pipe is sealed and connected to the second side of the main box body, and the second end of the second variable-section transition pipe is sealed and connected to the first end of the flue air inlet pipe. The cross-sectional area of ​​the second variable-section transition pipe gradually decreases along the airflow direction.

4. The device according to claim 1, wherein The device further comprises: a telescopic variable diameter transition pipe; The telescopic variable diameter transition pipe comprises: a bellows section, wherein a first end of the bellows section is sealedly connected to a second end of the flue air inlet pipe; A conical sleeve is sealingly connected to the second end of the bellows section, and is used for sealing connection with the flue system.

5. The device according to claim 1, wherein The device further comprises: a pressure relief valve, which is communicated with the flue air inlet pipe.

6. The device according to any one of claims 1 to 5, characterized in that The main box body includes a smoke delivery cover arranged on the top thereof, and the smoke delivery cover is provided with a sealed opening and closing structure.

7. The device according to claim 1, wherein The flue air inlet pipe includes a transparent observation portion.

8. The device according to claim 6, wherein The main box includes a spray mechanism arranged inside the main box.

9. A method for using the device according to any one of claims 1 to 8, characterized in that: include: Sealingly connecting the second end of the flue air inlet pipe to the flue system of the building; Turning on the switch of the blower to start blowing air; After the blower has been running for a certain period of time, observe the value of the pressure gauge. If the value of the pressure gauge is stable within the preset range, it is determined that the air tightness of the flue system of the building meets the requirements; if the value of the pressure gauge flues or is lower than the preset range, it is determined that there are construction quality problems in the flue system of the building.

10. A method for using the device according to any one of claims 6 to 8, characterized in that: include: Sealingly connecting the second end of the flue air inlet pipe to the flue system of the building; Turning on the switch of the blower to start blowing air; The smoke generating mechanism is placed into the main box through the smoke delivery cover, and the main box is sealed so that the airflow generated by the blast sends the smoke generated by the smoke generating mechanism into the flue system of the building through the flue air inlet pipe; Observe the various connections of the flue system of the building and the joints between the flue system of the building and the flue of each household in the building to see if there is any smoke leakage, so as to determine the air tightness of the flue system of the building and the flue joints.

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