Enclosure structure single leakage source airtightness testing device and calculation method

Abstract

The invention provides an air tightness testing device and calculation method for a single leakage source of an enclosure structure, and belongs to the technical field of air tightness testing devices.The air tightness testing device comprises a leakage source temporary sealing system, a measuring system and a pressure difference control system; the pressure difference control system is used for adjusting the pressure difference inside and outside the enclosure structure and comprises a frequency conversion fan, a flow adjusting valve and a data acquisition and control device; pressure difference control is achieved through a data acquisition and controller, a frequency conversion fan and a flow adjusting valve adjust the internal and external pressure difference of an enclosure structure, the leakage rate under each pressure difference working condition is obtained through a pressure difference sensor and a flow sensor, and an overall leakage rate calculation formula before and after a specific leakage source is blocked is obtained through temperature correction and curve fitting. And calculating the leakage rate of a series of pressure difference working condition points and the leakage rate of the specific leakage source under the pressure difference, and carrying out curve fitting on the leakage rate of the specific leakage source to obtain a leakage rate calculation formula of the specific leakage source. According to the invention, accurate and efficient single leakage source leakage rate testing is realized.

Description

Technical Field

[0001] This invention belongs to the technical field of airtightness testing devices, and particularly relates to an airtightness testing device and calculation method for a single leakage source in an enclosure structure. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Typically, certain building envelopes require high airtightness, as airtightness failure can lead to significant problems. For example, building envelopes with sources of gaseous contamination require high airtightness to prevent the contaminants from leaking to the outside; similarly, cleanrooms, which require pure air inside the building envelope free of any contaminants, also require high airtightness to prevent external contaminants from leaking inside.

[0004] Before a high-airtightness building envelope is put into use, an airtightness test is required, and regular airtightness tests are also necessary after it is put into use. There are mature standards and methods for testing the overall airtightness of building envelopes. However, when the overall airtightness of the building envelope does not meet project or environmental requirements, corresponding improvements need to be made to the airtightness of the building envelope to ultimately achieve the required airtightness for the project.

[0005] The key to locating leak sources requiring improvement lies in assessing the actual leakage rate of each leak source within the overall building envelope environment. Assessing each leak source individually presents a challenge due to the difficulty in decoupling each source. Building envelopes typically harbor multiple leak sources simultaneously, and these sources vary in form; some leak through gaps, while others leak through tiny pores in the concrete wall surface. Their distribution is also diverse, ranging from around door and window seals to construction joints around the concrete perimeter. Therefore, while existing technologies can achieve the overall leakage rate of the building envelope under multiple leak sources, it is difficult to assess the leakage rate of each individual leak source within the envelope. When the overall leakage rate of the building envelope fails to meet design requirements, existing technologies struggle to pinpoint which leak source's leakage rate is substandard, hindering the development of targeted airtightness improvement measures. Summary of the Invention

[0006] To overcome the shortcomings of the existing technology, this invention proposes a device and calculation method for testing the airtightness of a single leakage source in an enclosure structure. The device measures the overall leakage rate of the enclosure structure under a series of pressure differentials before and after sealing the single leakage source, and then obtains two fitted curves of the leakage rate under different pressure differentials before and after sealing. Under the same pressure differential condition, the leakage rates corresponding to the two fitted curves before and after sealing are extracted and subtracted; this difference represents the overall leakage rate before and after sealing, thus obtaining the leakage rate of the single leakage source under this condition. Using the same method, the leakage rates of the single leakage source under a series of pressure differential conditions can be obtained. By fitting this series of data to a curve, the pressure differential leakage rate curve of the single leakage source can be obtained.

[0007] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions: In a first aspect, the present invention discloses a device for testing the airtightness of a single leakage source in an enclosure structure, comprising: A temporary sealing system for sealing a leakage source, used to seal an enclosure structure, includes a sealing cover, a sealing cap, and a gap sealing device. The sealing cover is used to seal the airtight doors of the enclosure structure as a whole, the sealing cap is used to seal the penetrations of the enclosure structure, and the gap sealing device is used to seal the leakage gaps of the enclosure structure. The measurement system is used to measure the temperature, pressure difference, and leakage rate inside and outside the building envelope, including temperature sensors, pressure difference sensors, and flow sensors; The differential pressure control system is used to regulate the pressure difference between the inside and outside of the building envelope. It includes a variable frequency fan, flow regulating valves, and a data acquisition and controller. Differential pressure control is achieved through the data acquisition and controller. The variable frequency fan and flow regulating valves adjust the pressure difference between the inside and outside of the building envelope. The overall leakage rate before and after sealing a specific leakage source is obtained through differential pressure sensors and flow sensors. The leakage rate before and after sealing a specific leakage source is calculated based on the formula for calculating the total leakage rate before and after sealing a specific leakage source. Under the same differential pressure condition, the leakage rates before and after sealing are subtracted to obtain the leakage rate of a specific leakage source. Curve fitting is performed on the leakage rate of the specific leakage source to obtain the formula for calculating the leakage rate of the specific leakage source.

[0008] Secondly, this invention discloses a method for calculating the airtightness of a single leakage source in an enclosure structure, utilizing the aforementioned airtightness testing device for a single leakage source in an enclosure structure, comprising: Before sealing the leak source to be tested, the overall leakage rate was tested under several pressure differential conditions, and the overall leakage rate before sealing was recorded. Based on the overall leakage rate before sealing, it was corrected according to the standard temperature. Then, the corrected leakage rates under several pressure differential conditions were curve-fitted to obtain the formula for calculating the pressure differential of the enclosure structure before sealing the leak source to be tested - the total leakage rate. After sealing the leak source to be tested, the overall leakage rate was tested under several similar differential pressure conditions, and the overall leakage rate after sealing was recorded. Based on the overall leakage rate after sealing, it was corrected according to the standard temperature. Then, the corrected leakage rates under several differential pressure conditions were curve-fitted to obtain the formula for calculating the differential pressure of the enclosure structure after sealing the leak source to be tested - the total leakage rate. Under each differential pressure condition, the overall leakage rate before and after sealing the leakage source is calculated according to the formula for the overall leakage rate before and after sealing the leakage source. The leakage rate before and after sealing is subtracted to obtain the leakage rate of a single leakage source at each differential pressure condition. Based on the leakage rate of a single leakage source at multiple differential pressure points, curve fitting is performed to obtain the formula for calculating the differential pressure-leakage rate of this single leakage source.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: The airtightness testing method for a single leakage source in the building envelope of this invention can obtain the leakage rate of a single leakage source under actual engineering conditions, and the test data is accurate and reliable. The leakage rate test is conducted on an actual building envelope, not under laboratory conditions. The actual leakage rate reflects the comprehensive influence of actual building materials, construction techniques, installation quality, and other factors.

[0010] The single-source leak tightness testing method proposed in this invention is highly operable, requires minimal equipment, and yields accurate and reliable leakage rates. Testing the leakage rate of a single leak source does not require ensuring completely identical test conditions before and after sealing, thus reducing the equipment requirements and operational complexity of the testing and control systems. Users do not need to adjust the control system to achieve completely identical conditions before and after sealing. Instead, they first derive the calculation formula for the overall leakage rate under multiple conditions before and after sealing, then calculate the overall leakage rate under the same conditions using the formulas for both before and after sealing. The difference between these formulas yields the leakage rate of the single leak source under that specific condition. The data processing method is simple, and the obtained leakage rate is accurate and reliable.

[0011] The single-source airtightness test method proposed in this invention obtains the leakage rate formula of a single leakage source under different pressure differences through one sealing, two sets of tests, and three fittings. It is simple to operate and can accurately calculate the leakage rate formula of each leakage source under the premise of simplifying the sealing steps.

[0012] This invention can assess any leakage source in a real building envelope and can individually measure and evaluate the airtightness of any leakage source.

[0013] This invention can pinpoint airtightness issues in any actual building envelope. By sequentially measuring the leakage rate of each leakage source within the envelope and comparing it to the designed leakage rate for that source, if the measured leakage rate of a particular source is significantly higher than the designed leakage rate, it can be determined that the airtightness of that source does not meet the requirements. Targeted airtightness improvement measures can then be implemented for this leakage source, achieving overall airtightness improvement and compliance with standards for the building envelope.

[0014] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0016] Figure 1 This is a structural diagram of the airtightness testing device for a single leakage source in the enclosure structure as described in Embodiment 1 of the present invention.

[0017] Figure 2 This is a schematic diagram of a typical enclosure structure as described in Embodiment 1 of the present invention.

[0018] Figure 3 This is a schematic diagram of the method for obtaining the leakage rate formula of a single leakage source in the enclosure structure in Embodiment 2 of the present invention.

[0019] Figure 4 This is a schematic diagram of the overall leakage rate test and curve fitting of the enclosure structure in Embodiment 2 of the present invention.

[0020] Figure 5 This is a schematic diagram illustrating the case of obtaining the leakage rate of a single leakage source in the enclosure structure in Embodiment 2 of the present invention.

[0021] Figure 6 This is a schematic diagram of a fitting example of the leakage rate formula for the penetrating component in Embodiment 2 of the present invention.

[0022] Figure 7 This is a schematic diagram of a case study on fitting the construction joint leakage rate formula in Embodiment 2 of the present invention. Detailed Implementation

[0023] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0024] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations of the present invention.

[0025] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0026] Example 1 When the overall airtightness of the building envelope does not meet the requirements, it is necessary to identify the leakage sources that need improvement and pinpoint the main leakage sources. Identifying the leakage sources that need improvement requires addressing the following issues: First, the overall airtightness of the building envelope is the result of the combined effect of all leakage sources, therefore it is necessary to identify all leakage sources. For example, leakage sources for a certain building envelope may include airtight doors, airtight windows, concrete walls, construction joints, and penetrations.

[0027] Secondly, the airtightness of various leakage sources varies significantly. Doors and windows that need to be opened and moved typically have relatively poor airtightness, while inactive construction joints, penetrations, and concrete have relatively good airtightness. Therefore, it is necessary to determine the basic leakage rate magnitude for each leakage source. For critical airtight components, airtightness factory tests are usually conducted to obtain basic leakage rate data. For some commonly used components, the basic leakage rate can be obtained based on empirical data or publicly available data.

[0028] Finally, the airtightness of a single leak source differs significantly from the factory test result, being closely related to on-site installation techniques, environment, and materials, and also changing over time. For example, for airtight doors, factory airtightness tests are typically conducted under ideal installation conditions. However, during on-site installation, the door frame is subjected to concrete stress, leading to localized deformation and a reduced fit between the door and frame. Furthermore, prolonged operation causes the rubber sealing strips to age, further deteriorating the airtightness of the door. Therefore, it is necessary to assess the actual leakage rate of a single leak source within the overall building envelope environment.

[0029] Based on the above analysis, identifying the leakage sources that need improvement primarily involves assessing the actual leakage rate of each leakage source within the overall building envelope environment and comparing it with the baseline leakage rate from the factory test. If the actual leakage rate of a single leakage source is significantly higher than the baseline leakage rate, then this leakage source is the one that needs improvement. For components with a high baseline leakage rate, if their actual leakage rate is not significantly different from the baseline leakage rate, then improvement is unnecessary.

[0030] In one or more embodiments, the present invention discloses a device for testing the airtightness of a single leakage source in an enclosure structure, such as... Figure 1 As shown, it includes a temporary sealing system for the leak source, a measurement system, and a differential pressure control system; It should be understood that typical building envelopes include... Figure 2 As shown, the leakage sources of the enclosure structure include airtight door 1, concrete wall 2, construction joint 3, first penetrating component 4, second penetrating component 5, third penetrating component 6, etc.

[0031] The temporary sealing system for leaks includes a sealing cover, a sealing cap, and a gap sealing device, with the gap sealing device using sealing tape. A steel sealing cover 7 is used to completely seal the airtight door 1. The sealing cover 7 is bolted to the door body around its perimeter, and rubber gaskets are used on the sealing surface to enhance the sealing effect. The supporting part of the sealing cover needs to be welded to the embedded plate to ensure the overall airtightness of the sealing cover. A flange sealing cap 10 is used to seal the penetrations, and the joints between the penetrations and the concrete are sealed separately using double-layer tape. Tape 9 is used to seal the joint between the first penetration 4 and the concrete, tape 11 is used to seal the joint between the second penetration 5 and the concrete, and tape 12 is used to seal the joint between the third penetration 6 and the concrete. For leaking gaps such as construction joints 3, double-layer tape 8 is used to apply and seal the gaps. The edges of the gaps need to be smoothed to ensure that the tape completely adheres to the wall and forms a seal.

[0032] In this embodiment, the temporary sealing system needs to achieve a complete seal while also being easy to disassemble; the sealing system must not damage the building envelope.

[0033] The measurement system includes a flow sensor 16, a differential pressure sensor 17 for the inside and outside of the building envelope, and several temperature sensors. Specifically, the temperature sensors include at least a first internal temperature sensor 23, a second internal temperature sensor 24, a third internal temperature sensor 25, and a fourth internal temperature sensor 26, all located inside the building envelope. These four internal sensors are evenly distributed inside the building envelope. The system also includes at least an external temperature sensor 27 located outside the building envelope. The flow sensor 16 is located between the flow regulating valve and the through-hole and is used to test the flow rate in the pipeline. The flow sensor 16 needs to have a temperature correction function, and the measured and displayed flow rate needs to be the gas flow rate at a standard temperature of 20 degrees Celsius. The two measuring points 21 and 22 of the differential pressure sensor 17 are respectively located inside and outside the building envelope.

[0034] In this embodiment, since the temperature may be inconsistent in different parts of the interior, multiple temperature sensors are used. The average value of four sensors can be used for calculation, thereby making the test more accurate.

[0035] The differential pressure control system includes a variable frequency fan 13, a flow regulating valve 15, a bypass flow regulating valve 14, a connecting duct 18, a variable frequency controller 19, and a data acquisition and controller 20. The differential pressure control system is connected to the enclosure structure via the ductwork. The variable frequency fan 13, flow regulating valve 15, and bypass flow regulating valve 14 are connected together via the duct 18. The data acquisition and controller 20 is connected to the variable frequency controller 19, a flow sensor 16, a differential pressure sensor 17, a first internal temperature sensor 23, a second internal temperature sensor 24, a third internal temperature sensor 25, a fourth internal temperature sensor 26, and an external temperature sensor 27. The variable frequency controller 19 is connected to the fan 13 to control the fan's start / stop and speed.

[0036] In this embodiment, the differential pressure control system adjusts the pressure difference between the inside and outside of the enclosure structure. The differential pressure control is mainly achieved by adjusting the flow regulating valve 15, the bypass flow regulating valve 14, and the frequency of the variable frequency fan. This allows the leakage rate under various differential pressure conditions to be obtained. Temperature correction and curve fitting are used to obtain the overall leakage rate before and after blocking a specific leakage source. The leakage rate of the specific leakage source is obtained by subtracting the overall leakage rate before and after blocking the specific leakage source.

[0037] The overall leakage rate of the building envelope is read by flow sensor 16. According to the law of conservation of mass, after the internal and external pressure difference stabilizes, when the internal pressure of the building envelope is negative, the flow rate of gas permeating into the building envelope from the outside is equal to the flow rate of gas discharged through the pipe. Therefore, the overall leakage rate of the building envelope can be read from flow sensor 16. When the internal pressure of the building envelope is positive, the overall leakage rate of the building envelope can also be read from flow sensor 16 according to the same principle.

[0038] Preferably, the flow sensor 16 for overall leakage rate measurement is an automatic temperature-corrected flow meter, and the obtained flow meter reading is the air gas flow rate at a standard temperature (such as 20 degrees Celsius), thereby eliminating the influence of the fan and the surrounding environment on the leakage volume flow rate measurement.

[0039] Example 2 In one or more embodiments, using the above-mentioned single-source leak tightness testing device for building envelope, a method for testing the single-source leak tightness of building envelope is disclosed. By testing each leak source individually, the leak rate obtained by the test can be compared with the design value of the leak source or the previous leak rate data. If the difference is large, the leak source can be determined to be a problem leak source that needs to be improved; if the difference is small, the problem of the leak source can be ruled out.

[0040] The principle of measuring the leakage rate of a single leakage source in the building envelope is to measure the overall leakage rate of the building envelope before and after sealing the leakage source. Under the same temperature and pressure differential conditions, the difference between the overall leakage rates before and after sealing is the leakage rate of the single leakage source under these conditions. It is important to note that in order to obtain accurate leakage rate data for this single leakage source, it is necessary to strictly ensure that the two overall leakage rates used for the difference are completely identical under the same operating conditions, that is, the temperature and pressure differential conditions must be completely identical.

[0041] Because the testing system cannot perfectly match the temperature and pressure difference before and after sealing, the measured leakage rate needs to be corrected to the leakage rate at the standard temperature. Simultaneously, to ensure consistent pressure difference, the temperature-corrected leakage rates before and after sealing need to be fitted into curves. Then, the leakage rates at the same pressure difference point are found on the fitted curves before and after sealing, and the difference is calculated to obtain the leakage rate of a single leakage source at that pressure difference. By obtaining the leakage rates of a single leakage source under multiple pressure differences using this method, and then performing curve fitting, the formula for the leakage rate of a single leakage source under different pressure differences can be obtained. Therefore, the formula for the leakage rate of a single leakage source under different pressure differences can be obtained through one sealing operation, two sets of tests, and three fitting operations. Specifically, the leakage rate of a single leakage source is obtained by using the overall leakage rate before and after sealing the leakage source under the same operating conditions, including the following steps: Step S1: Before sealing the leak source to be tested, test the overall leakage rate under several differential pressure conditions and record the overall leakage rate before sealing; based on the overall leakage rate before sealing, correct it according to the standard temperature, and finally obtain the leakage rate before sealing at the standard temperature.

[0042] The correction formula for leakage rate at standard temperature is: Q=Q real *[(273.15+T real ) / (273.15+T)] 1.7 Where Q is the leakage rate at standard temperature; Q real The leakage rate is the actual temperature of the air entering the leakage source; T real The actual temperature of the air entering the leak source; T is the standard temperature, such as 20℃.

[0043] This example demonstrates operation under five or more differential pressure conditions, such as Figure 3 As shown, points P1, P2, P3, P4, and P5 are evenly distributed. The overall leakage rate is tested near these differential pressure points, and the overall leakage rate before sealing is recorded. This example is modified to reflect the leakage rate before sealing the leakage source at a standard temperature of 20 degrees Celsius. Figure 3 x1, x2, x3, x4, x5.

[0044] Step S2: Perform curve fitting on the pre-plugging leakage rate after temperature correction under different pressure differentials before plugging a specific leakage source. To ensure fitting accuracy, the coefficient of determination R of the fitting formula is... 2 It needs to be greater than 0.98. Obtain the formula for the overall leakage rate before sealing a specific leakage source; such as... Figure 3 The formula for the leakage rate fitted before the leakage source in the central seal is: Q'=a'p b’ In the formula, Q' is the total leakage rate of the enclosure structure before sealing the leakage source at standard temperature; a' is the coefficient of the fitting formula for the leakage rate before sealing the leakage source; p is the pressure difference between the inside and outside of the enclosure structure; and b' is the index of the fitting formula for the leakage rate before sealing the leakage source.

[0045] Step S3: Seal off the leak source to be tested. Near pressure differential points P1, P2, P3, P4, and P5, test the overall leakage rate of the enclosure structure after sealing the leak source. In this example, the leakage rate after sealing the leak source is corrected to a standard temperature of 20 degrees Celsius. Figure 3 Among y1, y2, y3, y4, y5.

[0046] Step S4: Perform curve fitting on the pre-plugging leakage rate under different pressure differentials after sealing a specific leakage source, after temperature correction. To ensure fitting accuracy, the coefficient of determination R of the fitting formula is... 2 It needs to be greater than 0.98. The formula for the overall leakage rate after sealing a specific leak source is obtained; for example... Figure 3 The formula for the leakage rate fitted after the leakage source in the central seal is: Q''=a''p b’’ In the formula, Q'' is the total leakage rate of the enclosure structure after sealing the leakage source at standard temperature; a'' is the coefficient of the leakage rate fitting formula after sealing the leakage source; p is the pressure difference between the inside and outside of the enclosure structure; and b'' is the index of the leakage rate fitting formula after sealing the leakage source.

[0047] For each pressure differential condition P1, P2, ..., Pn, the overall leakage rate before and after plugging is calculated according to the formula for the overall leakage rate before and after plugging the leakage source. That is, by substituting different pressure differential data, several overall leakage rates are obtained; as shown in the following formula: Q n '=a'p n b’ Q n ''=a''p n b’’ Then, the individual leakage rate z of this leakage source is obtained by subtracting the leakage rates before and after plugging under the corresponding pressure difference Pn. n The formula is as follows: z n = Qn '- Q n '' Therefore, the leakage rates z1, z2…zn of this single leakage source can be obtained under each pressure difference condition P1, P2, ..., Pn. Figure 3 z1, z2…zn.

[0048] Step S5: Based on the leakage rates z1, z2… zn of this single leakage source under each differential pressure condition obtained above (P1, P2, ..., Pn), perform curve fitting. The coefficient of determination R of the fitting formula is... 2 A value greater than 0.98 is required to derive the formula for calculating the leakage rate of a single leakage source, as follows: Q=ap b In the formula, Q is the leakage rate of a single leakage source at standard temperature; a is the coefficient of the leakage rate fitting formula; p is the pressure difference between the inside and outside of the enclosure structure; and b is the exponent of the leakage rate fitting formula.

[0049] By performing one sealing operation, two tests, and three fitting operations, the leakage rate calculation formula for any single leakage source can be obtained. For multiple leakage sources, the same method can be used to seal, test, and fit each leakage source separately to obtain the leakage rate calculation formula for each leakage source.

[0050] The following two operational examples illustrate the method for obtaining the calculation formula for a single leakage source.

[0051] Specifically, before testing, the testing equipment piping must first be sealed. Figure 1 18) and penetrating parts ( Figure 1 (5,6) and airtight door ( Figure 1 (1) Seal the airtight door 1 with the sealing cover 7, seal the test pipeline penetration 5 with double-layer tape 11, and seal the equipment penetration 6 with double-layer tape 12. Seal the penetration 4 with the flange using the sealing cover 10. After sealing, check the airtightness of the measuring equipment pipeline and the overall enclosure structure. Positive pressure can be applied, such as pressurizing to 1500Pa, and observe whether the internal and external pressure difference decreases slowly. At the same time, observe whether there is obvious air leakage at the joints of the enclosure structure and the pipeline connections.

[0052] After ensuring that the enclosure structure and equipment piping are well sealed, the airtightness test can begin.

[0053] The first step involves measuring the overall leakage rate of the entire building envelope at pressure differences of 300 Pa, 600 Pa, 800 Pa, 1000 Pa, 1200 Pa, 1400 Pa, and 1600 Pa. This leakage rate represents the overall leakage rate of the envelope, including concrete, construction joints, and penetration joints. The leakage rate is then corrected for the temperature at the leakage point to a standard temperature (20 degrees Celsius), and finally, the leakage rate at the standard temperature is obtained. Figure 4 The square points shown.

[0054] The second step is to seal the joint of the penetrating component 4. The sealing method is to first smooth the area around the joint, and then seal it with double-layer adhesive tape 9. Next, measure the overall leakage rate of the entire enclosure structure near pressure differences of 300Pa, 600Pa, 800Pa, 1000Pa, 1200Pa, 1400Pa, and 1600Pa. The leakage rate obtained at this time is the overall leakage rate of the enclosure structure concrete and construction joint. Correct for the temperature at the leakage point to a standard temperature (20 degrees Celsius), and finally obtain the leakage rate at the standard temperature. For example... Figure 4 The triangle point shown.

[0055] The third step is to seal the construction joint 3. The sealing method involves first smoothing the area around the joint, and then sealing it with double-layer adhesive tape 8. Next, the overall leakage rate of the entire enclosure structure is measured near pressure differences of 300Pa, 600Pa, 800Pa, 1000Pa, 1200Pa, 1400Pa, and 1600Pa. The leakage rate obtained at this time is the overall leakage rate of the concrete enclosure structure. This is corrected for the temperature at the leakage point to a standard temperature (20 degrees Celsius), and finally, the leakage rate at the standard temperature is obtained. For example... Figure 4 The circled dots are shown.

[0056] The fourth step involves performing curve fitting on the three sets of leakage rate data obtained: the overall leakage rate of the retaining structure concrete, construction joints, and penetration joints; the overall leakage rate of the retaining structure concrete and construction joints; and the overall leakage rate of the retaining structure concrete. Specifically, as follows... Figure 4 As shown, the leakage rate correlation can be obtained: Q1=0.0014P 1.03739 Q2=0.00151P 1.01562 Q3 = 0.0014P 1.01554 In the formula, Q1 is the total leakage rate of concrete, construction joint, and penetrating joint; Q2 is the total leakage rate of concrete and construction joint; Q3 is the concrete leakage rate; and P is the pressure difference between the two ends of the leakage source.

[0057] Step 5: Substitute the values ​​at 300Pa, 600Pa, 800Pa, 1100Pa, 1300Pa, 1400Pa, and 1500Pa into the leakage rate formula above to obtain the leakage rate at each pressure difference, as shown in the details below. Figure 5 As shown.

[0058] Step 6: Subtract the total leakage rate of concrete, construction joint, and penetrating joint from the total leakage rate of concrete and construction joint under various pressure differentials to obtain the leakage rate of penetrating joint under various pressure differentials. Then, fit this set of leakage rate curves, such as... Figure 6 As shown, the correlation for the leakage rate of the through-joint is then obtained: Q4=0.00001P 1.3633 In the formula, Q4 is the leakage rate of the through-hole joint.

[0059] Step 7: Subtract the total leakage rate of concrete and construction joint from the concrete leakage rate under various pressure differentials to obtain the leakage rate of construction joint 8 under various pressure differentials. Then, fit this set of leakage rate curves, as follows: Figure 7 As shown, the correlation for the leakage rate of construction joint 3 is then obtained: Q5 = 0.0001P 1.0166 In the formula, Q5 is the leakage rate of construction joint 3.

[0060] The descriptions of each embodiment in the above embodiments have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for testing the airtightness of a single leakage source in an enclosure structure, characterized in that, include: A temporary sealing system for sealing a leakage source, used to seal an enclosure structure, includes a sealing cover, a sealing cap, and a gap sealing device. The sealing cover is used to seal the airtight doors of the enclosure structure as a whole, the sealing cap is used to seal the penetrations of the enclosure structure, and the gap sealing device is used to seal the leakage gaps of the enclosure structure. The measurement system is used to measure the temperature, pressure difference, and leakage rate inside and outside the building envelope, including temperature sensors, pressure difference sensors, and flow sensors. Differential pressure control system, used to regulate the pressure difference between the inside and outside of the building envelope, includes variable frequency fans, flow regulating valves, and data acquisition and controllers; Differential pressure control is achieved through data acquisition and controllers. Variable frequency fans and flow regulating valves adjust the pressure difference inside and outside the enclosure structure. The overall leakage rate before and after sealing a specific leakage source is obtained through differential pressure sensors and flow sensors under various differential pressure conditions. The leakage rate before and after sealing a specific leakage source is calculated according to the formula for calculating the total leakage rate before and after sealing a specific leakage source. Under the same differential pressure conditions, the leakage rate before and after sealing is subtracted to obtain the leakage rate of a specific leakage source. Curve fitting is performed on the leakage rate of a specific leakage source to obtain the formula for calculating the leakage rate of a specific leakage source.

2. The airtightness testing device for a single leakage source in an enclosure structure as described in claim 1, characterized in that, The temperature sensor includes at least four internal temperature sensors disposed inside the enclosure structure, the four internal sensors being evenly arranged inside the enclosure structure, and an external temperature sensor disposed outside the enclosure structure.

3. The airtightness testing device for a single leakage source in an enclosure structure as described in claim 1, characterized in that, The differential pressure control system also includes connecting ducts and a frequency converter; the connecting ducts connect the fan, regulating valve, flow meter, and through-hole; the frequency converter connects to the variable frequency fan to realize the fan start-up, shutdown, and speed control.

4. The airtightness testing device for a single leakage source in an enclosure structure as described in claim 1, characterized in that, The flow sensor is an automatic temperature-corrected flow meter, and the obtained flow meter reading is the air gas flow rate at standard temperature.

5. A method for testing the airtightness of a single leakage source in an enclosure structure, utilizing the airtightness testing device for a single leakage source in an enclosure structure as described in any one of claims 1-4, characterized in that, include: Before sealing the leak source to be tested, the overall leakage rate was tested under several differential pressure conditions, and the overall leakage rate before sealing was recorded. Based on the overall leakage rate before sealing, it is corrected according to the standard temperature. Then, the corrected leakage rates under several pressure difference conditions are curve-fitted to obtain the calculation formula of the pressure difference of the enclosure structure before sealing the leakage source to be tested - the total leakage rate. After sealing the leak source to be tested, the overall leakage rate was tested under several similar differential pressure conditions, and the overall leakage rate after sealing was recorded. Based on the overall leakage rate after sealing, the standard temperature is corrected, and then the corrected leakage rates under several pressure difference conditions are curve-fitted to obtain the formula for calculating the pressure difference of the enclosure structure after sealing the leakage source to be tested - the total leakage rate. Under each differential pressure condition, the overall leakage rate before and after sealing the leakage source is calculated according to the formula for the overall leakage rate before and after sealing the leakage source. The leakage rate before and after sealing is subtracted to obtain the leakage rate of a single leakage source at each differential pressure condition. Based on the leakage rate of a single leakage source at multiple differential pressure points, curve fitting is performed to obtain the formula for calculating the differential pressure-leakage rate of this single leakage source.

6. The method for testing the airtightness of a single leakage source in an enclosure structure as described in claim 5, characterized in that, The formula for calculating the pressure difference of the enclosure structure before sealing the leakage source to be tested - the total leakage rate is as follows: Q’=a’p b’ In the formula, Q' is the total leakage rate of the enclosure structure before sealing the leakage source at standard temperature; a' is the coefficient of the fitting formula for the leakage rate before sealing the leakage source; p is the pressure difference between the inside and outside of the enclosure structure; and b' is the index of the fitting formula for the leakage rate before sealing the leakage source.

7. The method for testing the airtightness of a single leakage source in an enclosure structure as described in claim 5, characterized in that, The correction formula for leakage rate at standard temperature is: Q=Q real *[(273.15+T real ) / (273.15+T)] 1.7 Where Q is the leakage rate at standard temperature; Q real The leakage rate is the actual temperature of the air entering the leakage source; T real T represents the actual temperature of the air entering the leak source; T represents the standard temperature.

8. The method for testing the airtightness of a single leakage source in an enclosure structure as described in claim 5, characterized in that, Based on the overall leakage rate after sealing, corrections are made according to standard temperature. Then, curve fitting is performed on the corrected leakage rates under several pressure differential conditions to derive the formula for calculating the pressure differential of the enclosure structure minus the total leakage rate after sealing the leakage source to be tested: Q’’=a’’p b’’ In the formula, Q'' is the total leakage rate of the enclosure structure after sealing the leakage source at standard temperature; a'' is the coefficient of the leakage rate fitting formula after sealing the leakage source; p is the pressure difference between the inside and outside of the enclosure structure; and b'' is the index of the leakage rate fitting formula after sealing the leakage source.

9. The method for testing the airtightness of a single leakage source in an enclosure structure as described in claim 5, characterized in that, The formula for calculating the overall leakage rate before and after sealing the leakage source based on the formula for the overall leakage rate before and after sealing the leakage source, and the formula for obtaining the individual leakage rate of each leakage source by subtracting the leakage rates before and after sealing, are as follows: z n = Q n ’- Q n ’’ In the formula, z n Q'' represents the single leakage rate; Q'' represents the total leakage rate of the enclosure structure after sealing the leakage source at standard temperature; Q'' represents the total leakage rate of the enclosure structure before sealing the leakage source at standard temperature.

10. The method for testing the airtightness of a single leakage source in an enclosure structure as described in claim 9, characterized in that, The leakage rate correlation was obtained through fitting: Q=aP b In the formula, Q is the leakage rate of a single leakage source; a is the coefficient of the leakage rate fitting formula; p is the pressure difference between the inside and outside of the enclosure structure; and b is the exponent of the leakage rate fitting formula.

Images