Local sealing leakage detection device and method

Abstract

The invention discloses a local sealing leakage detection device and method, and the device comprises a sealing cover which covers to-be-detected equipment and is in sealing contact with a wall body, and a local sealing detection region is formed between the sealing cover and the wall body; the power device is suitable for pressurizing or vacuumizing the sealing cover to a set pressure and detecting the sealing performance of the sealing cover; and the control terminal is suitable for controlling the power device to press or vacuumize the sealing cover, receiving detection information fed back by the power device, and comparing the detection information with set information so as to judge the contact position of the to-be-detected equipment and the wall body and / or the sealing performance of the covered wall body. According to the method, the sealing performance of the hot chamber wall can be checked in advance, the labor work concentration degree can be dispersed, the labor cost is saved, and the influence on the construction period is reduced. And the device is realized by adopting a modular design, is convenient to move, simple to maintain and easy to operate, is less restricted by a space environment, and can reduce risks in an implementation process.

Description

Technical Field

[0001] The invention relates to the technical field of industrial on-site sealing detection, and in particular to a local sealing leakage detection device and method. Background Art

[0002] Nuclear engineering projects involve a large number of hot cells that have strong radioactivity during operation. In order to ensure that radioactivity does not leak out during operation, the peepholes, penetrations, protective doors and other locations on the hot cell walls that come into contact with the wall or the body must be checked for sealing before radioactive media is put into the hot cell.

[0003] Currently, the inspection of sealing leakage is carried out after all the equipment on the wall of the target hot room is installed. The usual practice is to pressurize or draw negative pressure on the hot room as a whole, and then use leak detection liquid to check for leaks in the parts where the equipment contacts the wall and the equipment body. This practice can only be carried out after the entire hot room interior and wall equipment are installed, but this is generally in the later stage of the project. If leaks are found and then dealt with, the impact on the progress of the project will be very large, and it will take up the time for debugging the equipment in the hot room or there will be cross-construction, which increases the risk. At the same time, according to existing experience, during the sealing test, it was found that there were many leaks in the contact part between the hot room equipment and the wall. Dealing with the leaks takes a lot of time, resulting in a long period of sealing inspection, which restricts the progress of the project and the smooth completion of the project. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defect of affecting the progress of the project due to the excessively long sealing leakage detection time, thereby providing a local sealing leakage detection device and method.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A local sealing leakage detection device, comprising:

[0007] A sealing cover, wherein the sealing cover covers the device to be detected and is in sealing contact with the wall, and a local sealed detection area is formed between the sealing cover and the wall;

[0008] A power device, wherein the power device is suitable for pressurizing or evacuating the sealing cover to a set pressure and detecting the sealing performance of the sealing cover;

[0009] The control terminal is suitable for controlling the power device to pressurize or evacuate the sealing cover, and receiving the detection information fed back by the power device, and then comparing the detection information with the set information to determine the contact position between the device to be detected and the wall and / or the sealing of the covered wall.

[0010] To further optimize the technical solution, the sealing cover includes a sealing cover body and a fitting portion fitted to the wall, and the fitting portion is made of herringbone-shaped retractable and deformable rubber.

[0011] Further optimizing the technical solution, the power device includes:

[0012] A pump body, the pump body is connected to the local sealing detection area through a pipeline, and the controlled end of the pump body is connected to the output end of the control terminal;

[0013] A detection component is used to detect working condition information inside the sealing cover.

[0014] To further optimize the technical solution, the pump body is a positive pressure pump or a vacuum pump.

[0015] To further optimize the technical solution, the sealing cover is provided with at least one pressure sampling port and / or at least one temperature sampling port;

[0016] The detection component includes at least one pressure gauge and / or at least one thermometer. The pressure gauge is arranged in the pressure sampling port and connected to the control terminal through the pressure transmitter. The thermometer is arranged in the temperature sampling port and connected to the control terminal through the temperature transmitter.

[0017] To further optimize the technical solution, the sealing cover is arranged on a detachable telescopic bracket, and the telescopic bracket is suitable for supporting the sealing cover and can drive the sealing cover to move.

[0018] A local sealing leakage detection method, which is based on the local sealing leakage detection device and comprises the following steps:

[0019] S1. Set the sealing cover at the position where the device to be tested contacts the wall, and make the sealing cover completely cover the device to be tested;

[0020] S2. Start the power device to pressurize or draw negative pressure to the sealing cover so that the pressure inside the sealing cover reaches the set pressure;

[0021] S3. Maintain the pressure of the sealing cover, and determine the contact position between the device to be tested and the wall and / or the sealing performance of the covered wall based on the pressure difference change information of the sealing cover within a set time.

[0022] To further optimize the technical solution, in step S3, the specific method for determining the contact position between the device to be detected and the wall and / or the sealing performance of the wall covered is:

[0023] Set the pressure difference change value within the set time;

[0024] When the pressure holding time reaches the set time or the pressure difference change value of the sealing cover within the set time is within the set pressure difference change value range, the detection ends;

[0025] After the test is completed, the pressure holding time is compared with the set time, and the pressure difference change value of the sealing cover is compared with the set pressure difference change value; when the pressure holding time is the same as the set time, and the pressure difference change value of the sealing cover is less than the set pressure difference change value, it is judged that the sealing test has passed; when the pressure holding time is the same as the set time, and the pressure difference change value of the sealing cover is greater than the set pressure difference change value, it is judged that the sealing test has failed; when the pressure holding time is less than the set time, and the pressure difference change value of the sealing cover is greater than or equal to the set pressure difference change value, it is judged that the sealing test has failed.

[0026] To further optimize the technical solution, in step S3, the specific method for determining the contact position between the device to be detected and the wall and / or the sealing performance of the wall covered is:

[0027] The leakage rate of the measuring part is automatically calculated according to the leakage rate calculation formula of the pressure change method; when the leakage rate is within the set leakage rate range, it is judged that the sealing test has passed; when the leakage rate exceeds the set leakage rate range, it is judged that the sealing test has failed;

[0028] The leakage rate calculation formula of the pressure change method is:

[0029]

[0030] Where: T f - hourly leakage rate; t-test duration; P1-absolute pressure in the sealing cover at the beginning, Pa; P n - absolute pressure in the sealed cover at the end; T1- temperature in the sealed cover at the beginning; T n - The temperature inside the enclosure at the end.

[0031] Further optimize the technical solution, when testing the contact position between the equipment to be tested and the wall and / or the sealing of the wall for the first time, use the method of testing the leak point while pressing; after the leak point is handled, conduct a comprehensive leakage inspection;

[0032] And / or, the method is to perform local sealing detection during the installation of the equipment to be detected;

[0033] And / or, when the pressure in the sealing cover cannot be maintained, the other side of the wall where the test equipment is located is pressed or negative pressure is drawn;

[0034] And / or, after step S3, when a leak is detected, the other side of the wall where the detection device is located is tested for leaks; when the detected leak size is larger than the set leak size, or when the sealing cover cannot be maintained, the leak position is marked and the leak is processed.

[0035] The technical solution of the present invention has the following advantages:

[0036] 1. The local sealing leakage detection device provided by the present invention can check the sealing of the hot room wall in advance, disperse the concentration of manpower work, save manpower costs, and reduce the impact on the construction period. In addition, the device adopts a modular design, is easy to move, simple to maintain, easy to use, less restricted by the space environment, and can reduce the risk during the implementation process.

[0037] 2. The local sealing leakage detection device provided by the present invention covers the contact position between the equipment to be detected and the wall and / or the wall with a sealing cover, and then performs a local sealing test on it. By performing a sealing test on the local area during or after the installation of the hot chamber equipment, leaks can be discovered and dealt with early, avoiding project delays caused by discovering problems in the later stages of the project. The local sealing detection device only needs to pressurize or vacuum specific parts, which greatly shortens the detection time and improves the detection efficiency.

[0038] 3. The present invention provides a local sealing leakage detection device, wherein the sealing cover includes a sealing cover body and a fitting portion that fits with the wall, and the fitting portion is made of a herringbone-shaped retractable and deformable rubber to increase the sealing between it and the wall and eliminate the sealing effect caused by the unevenness of the wall surface.

[0039] 4. The invention provides a local sealing leakage detection device, wherein the sealing cover is arranged on a detachable telescopic bracket, and the telescopic bracket is suitable for providing support for the sealing cover when the sealing cover is attached to the wall, and the telescopic bracket can adjust the height and position as needed, so that the sealing cover can adapt to equipment at different positions. And the sealing cover can be easily removed when not needed, which is convenient for storage and transportation.

[0040] 5. The local sealing leakage detection method provided by the present invention can detect tiny leakage points more accurately by completely covering the equipment to be detected with a sealing cover, pressurizing or drawing negative pressure inside the sealing cover, and then maintaining pressure, and can provide high-precision pressure change data, thereby improving the accuracy of the detection results. By observing the pressure difference change value within a set time, false results caused by factors such as human operation errors can be effectively eliminated, reducing the possibility of misjudgment.

[0041] The above-mentioned local sealing leakage detection method has a high degree of automation in the whole process, which reduces the need for manual intervention. It is not only suitable for hot chamber sealing detection in nuclear engineering, but also can be applied to other industrial fields that require high sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. The drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 A schematic structural diagram of a local sealing leakage detection device provided by the present invention;

[0044] Figure 2 This is an interface display diagram of a control terminal of a local sealing leakage detection device provided by the present invention;

[0045] Figure 3 A structural diagram of a sealing cover in a local sealing leakage detection device provided by the present invention;

[0046] Figure 4 Another structural diagram of a sealing cover in a local sealing leakage detection device provided by the present invention;

[0047] Figure 5 The present invention provides a flow chart of a local sealing leakage detection method.

[0048] Reference numerals:

[0049] 1. Sealing cover, 2. Power unit, 21. Pump body, 22. Thermometer, 23. Pressure gauge, 3. Control terminal. DETAILED DESCRIPTION

[0050] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0054] Nuclear engineering projects involve a large number of hot cells that have strong radioactivity during operation. In order to ensure that radioactivity does not leak out during operation, the peepholes, penetrations, protective doors and other locations on the hot cell walls that come into contact with the wall or the body must be checked for sealing before radioactive media is put into the hot cell.

[0055] Currently, the inspection of sealing leakage is carried out after all the equipment on the wall of the target hot room is installed. The usual practice is to pressurize or draw negative pressure on the hot room as a whole, and then use leak detection liquid to check for leaks in the parts where the equipment contacts the wall and the equipment body. This practice can only be carried out after the installation of the entire hot room interior and wall equipment is completed, but this is generally in the later stage of the project. If leaks are found and then dealt with, the impact on the progress of the project will be very large, and it will take up the time for debugging the equipment in the hot room or there will be cross-construction, which increases the risk. At the same time, according to existing experience, during the sealing test, it was found that there were many leaks in the contact part between the hot room equipment and the wall. Dealing with the leaks takes a lot of time, resulting in a long period of sealing inspection, which restricts the progress of the project and the smooth completion of the project.

[0056] In order to solve the problem of long sealing leakage detection time affecting the project progress, the sealing performance of the sealed chamber is graded and inspected according to the nuclear industry standards. For the 2nd and 3rd level sealed chambers, a device for local sealing inspection of equipment is implemented. This device can carry out local sealing inspection after the installation of the hot room wall equipment is completed, and leaks can be found and handled in advance, so as to shorten the construction period and ensure that the construction progress is controllable.

[0057] The specific embodiments of the present invention are described in detail below in conjunction with the local sealing leakage detection device of the first aspect of the present invention and the local sealing leakage detection method of the second aspect of the present invention.

[0058] like Figures 1 to 4 As shown, in the first aspect, this embodiment discloses a local sealing leakage detection device, specifically discloses a device for local sealing leakage detection of peep windows, penetrations, glove boxes, etc. with a high level of automation, including a sealing cover 1, a power device 2 and a control terminal 3.

[0059] The sealing cover 1 covers the device to be detected and is in sealing contact with the wall, and a local sealed detection area is formed between the sealing cover 1 and the wall, and the local sealed detection area is airtight.

[0060] The power device 2 is suitable for pressurizing or evacuating the sealing cover 1 to a set pressure and detecting the sealing performance of the sealing cover 1 .

[0061] The control terminal 3 is suitable for controlling the power device 2 to pressurize or vacuum the sealing cover 1, and receiving the detection information fed back by the power device 2, and then comparing the detection information with the set information to determine the contact position between the device to be detected and the wall and / or the sealing of the covered wall.

[0062] The above-mentioned local sealing leakage detection device can perform sealing tests on hot chambers, peep windows, penetrations, glove boxes, sampling cabinets, etc. When performing sealing tests on the contact position between the equipment to be tested and the wall and / or the wall, the position is covered by the sealing cover 1, and then a local sealing test is performed on it. By performing sealing tests on local areas during or after the installation of the hot chamber equipment, leaks can be discovered and dealt with early, avoiding project delays caused by discovering problems in the later stages of the project. The local sealing detection device only needs to pressurize or vacuum specific parts, which greatly shortens the detection time and improves the detection efficiency.

[0063] By using the local sealing leakage detection device, local sealing detection can be carried out during or after the equipment installation, avoiding the risk of sealing inspection during equipment commissioning in the hot room and avoiding the safety hazards caused by cross-construction.

[0064] By using the local sealing leakage detection device, leaks can be found and treated in advance, significantly reducing rework caused by sealing problems, thus saving a lot of time and cost. At the same time, it avoids project delays caused by sealing problems and helps to complete the project on time.

[0065] The device can be moved to different detection positions as needed and can flexibly detect various key parts. It is suitable for different types of hot chamber equipment and wall structures, and is particularly suitable for complex nuclear engineering projects.

[0066] The control terminal can receive the detection information of the power device in real time, compare it with the set information, and promptly determine whether the sealing is qualified. This instant feedback mechanism helps to quickly respond to and handle problems.

[0067] As a further improved implementation, the sealing cover 1 is made of high-strength lightweight material. The sealing cover 1 includes a sealing cover body and a fitting portion that fits with the wall. The fitting portion is made of herringbone-shaped retractable and deformable rubber to increase the sealing between it and the wall and eliminate the sealing effect caused by the unevenness of the wall.

[0068] The sealing cover 1 has different shapes according to the area to be detected. Figure 3 As shown, the sealing cover 1 is set to a square shape, and the square sealing cover can be used to detect protective doors, peep windows and penetrations. Figure 4 As shown, the sealing cover 1 can also be set to a circular shape. The circular sealing cover can be used to detect penetrating parts, and sealing covers of different sizes can be manufactured according to the size of the area of ​​the detection area.

[0069] As a specific implementation, the power device 2 includes a pump body 21 and a detection component. The pump body 21 is connected to the local sealing detection area through a pipeline. More specifically, a pressure interface is provided on the sealing cover 1, and the pump body is connected to the pressure interface through a pipeline. The controlled end of the pump body is connected to the output end of the control terminal 3. The detection component is used to detect the working condition information inside the sealing cover 1.

[0070] More specifically, the pump body is a positive pressure pump or a vacuum pump. When the pump body is a positive pressure pump, a certain amount of gas can be filled into the local sealing detection area formed between the sealing cover 1 and the wall through the positive pressure pump, so that the inside of the local sealing detection area reaches a set pressure, which is convenient for subsequent pressure detection inside the local sealing detection area. When the pump body is a vacuum pump, the local sealing detection area formed between the sealing cover 1 and the wall can be evacuated through the vacuum pump, so that the inside of the local sealing detection area reaches a set pressure, which is convenient for subsequent pressure detection inside the local sealing detection area.

[0071] As a specific implementation, at least one pressure sampling port and / or at least one temperature sampling port is provided on the sealing cover 1. The detection component includes at least one pressure gauge 23 and / or at least one thermometer 22. The pressure gauge 23 is arranged in the pressure sampling port and is connected to the control terminal 3 through a pressure transmitter. The thermometer 22 is arranged in the temperature sampling port and is connected to the control terminal 3 through a temperature transmitter. Among them, the pressure gauge is specifically a remote pressure gauge, and the thermometer is specifically a thermocouple thermometer. In this embodiment, the pressure gauge detects the internal pressure of the local sealing detection area, and converts the pressure signal into an electrical signal through the pressure transmitter and feeds it back to the control terminal 3; the thermometer detects the internal temperature of the local sealing detection area, and converts the temperature signal into an electrical signal through the temperature transmitter and feeds it back to the control terminal 3. The detection component also includes a power supply, which is used to provide the electrical energy required by the entire device.

[0072] More specifically, the sealing cover 1 is connected to the pump body and the pressure gauge by a hose, and the sealing cover is connected to the thermometer by a cable. The power device 2 and the control terminal 3 are connected by a cable, or by a network cable, an optical cable, a twisted pair or other communication cable.

[0073] As a further improved implementation, a plurality of pressure gauges are provided, which are respectively arranged at different positions of the sealing cover 1, so as to facilitate a full range of pressure detection inside the sealing cover 1. A plurality of thermometers are provided, which are respectively arranged at different positions of the sealing cover 1, so as to facilitate a full range of temperature detection inside the sealing cover 1. The number of pressure gauges and thermometers can be determined according to the actual working conditions on site.

[0074] In this embodiment, multiple pressure gauges and thermometers can provide more comprehensive data to help accurately determine the pressure distribution and temperature distribution inside the sealing cover 1. The data provided by multiple pressure gauges and thermometers can be compared and analyzed to help identify abnormal situations. By arranging pressure gauges in different positions, the location where the leak may exist can be quickly located. If the pressure value in a certain area is significantly different from that in other areas, this may indicate that there is a leak in that area. If the readings of all pressure gauges drop in unison, this may indicate that there is a leak in the entire system; if only the pressure gauge readings in a certain area drop, it may be only a local leak in that area. Through the arrangement of multiple thermometers, temperature changes can be monitored in real time, and detection parameters can be adjusted or corresponding measures can be taken accordingly.

[0075] The multiple pressure gauges and thermometers arranged in the system improve the redundancy and reliability of the system. Even if a sensor fails, other sensors can still continue to work, ensuring that the detection process is not affected.

[0076] As a further improved implementation, the sealing cover 1 is arranged on a detachable telescopic bracket, which is suitable for providing support to the sealing cover 1 when the sealing cover 1 is attached to the wall and can drive the sealing cover to move. In this embodiment, the telescopic bracket can adjust the height and position as needed, so that the sealing cover 1 can adapt to equipment in different positions. And the sealing cover 1 can be easily removed when not needed, which is convenient for storage and transportation.

[0077] As a specific implementation method, the control terminal provides a human-machine interactive interface and can set corresponding control logic as needed. As a human-machine interface, the control terminal is used to monitor parameters such as pressure and temperature in the sealing cover, and also provides one-key detection function, parameter trend viewing function, sealing test data calculation and result judgment function, etc.

[0078] Combination Figure 5 As shown, in a second aspect, this embodiment discloses a local sealing leakage detection method, which is based on a local sealing leakage detection device and includes the following steps:

[0079] S1. Place the sealing cover 1 at the position where the device to be tested contacts the wall, and make the sealing cover 1 completely cover the device to be tested, which can ensure that the position where the device to be tested contacts the wall is completely covered, avoid missing any possible leakage points, and help to conduct a comprehensive sealing inspection to ensure the integrity of the entire system.

[0080] After the sealing cover 1 covers the equipment to be tested, the soft rubber on the edge of the sealing cover is used for sealing to ensure that the sealing cover 1 can be isolated from the air outside the sealing cover. Connect the pressure interface on the sealing cover to the pump body on the power device through a hose and a cable. Set a pressure gauge in the pressure sampling port and connect the pressure gauge to the pressure transmitter on the power device. Set a thermometer in the temperature sampling port and connect the thermometer to the temperature transmitter on the power device. Connect the power device to the control terminal through a cable.

[0081] S2. Start the power device 2 to pressurize or pump negative pressure into the sealing cover 1, so that the pressure inside the sealing cover 1 reaches the set pressure. After setting the required pressure value (such as 1000Pa) on the control terminal 3, click one-key detection, and the power device 2 will automatically start the pump, pressurize or pump negative pressure into the sealing cover 1 to the set pressure and then stop.

[0082] S3. Maintain the pressure of the sealing cover 1 and check the sealing performance of the part where the sealing cover and the wall are fitted. Based on the pressure difference change information of the sealing cover 1 within the set time, the contact position between the equipment to be tested and the wall and / or the sealing performance of the covered wall are judged, so that leakage can be quickly discovered and located, and timely measures can be taken to repair it.

[0083] In the above-mentioned local sealing leakage detection method, the control terminal is provided with a human-machine interface, which can set the required target pressure, start the detection work with one button, and automatically stop and maintain the pressure after reaching the pressure, and record the pressure and temperature trends.

[0084] The above-mentioned local sealing leakage detection method can detect tiny leaks more accurately by completely covering the equipment to be detected with a sealing cover, pressurizing or drawing negative pressure inside the sealing cover, and then maintaining pressure, and can provide high-precision pressure change data, thereby improving the accuracy of the test results. By observing the pressure difference change value within a set time, false results caused by factors such as human operating errors can be effectively eliminated, reducing the possibility of misjudgment.

[0085] The above-mentioned local sealing leakage detection method has a high degree of automation in the whole process, which reduces the need for manual intervention. It is not only suitable for hot chamber sealing detection in nuclear engineering, but also can be applied to other industrial fields with high sealing requirements.

[0086] As a specific implementation, in step S3, the specific method for determining the contact position between the device to be detected and the wall and / or the sealing performance of the wall covered is:

[0087] The pressure difference change value ⊿P is set within the set time t. More specifically, when the sealing cover 1 is pressurized, the pressure difference change value is a pressure drop value; when the sealing cover 1 is evacuated with negative pressure, the pressure difference change value is a pressure increase value. The pressure drop value and the pressure increase value are both positive values.

[0088] During the pressure maintenance period, the control terminal 3 will automatically record the pressure trend and timing measured by the pressure gauge. There are two variable parameters, set time and set pressure. If either of them exceeds the set value, the detection process ends. That is, if the pressure difference change value within the pressure maintenance time t is greater than ⊿P, the interface pops up "Sealing test failed, please check the leak point", the detection process ends, and the detection fails; if the pressure difference change value within the pressure maintenance time t is less than ⊿P, the interface pops up "Sealing test passed", the detection process ends, and the detection is successful. If there is a leak, the leak can be checked on the other side of the wall where the sealed equipment is located. If there is a large leak or the pressure cannot be maintained, the leak position can be marked and the leak can be processed.

[0089] After the test is completed, the pressure holding time is compared with the set time, and the pressure difference change value of the sealing cover 1 is compared with the set pressure difference change value; when the pressure holding time is the same as the set time, and the pressure difference change value of the sealing cover 1 is less than the set pressure difference change value, it is judged that the sealing test has passed; when the pressure holding time is the same as the set time, and the pressure difference change value of the sealing cover 1 is greater than the set pressure difference change value, it is judged that the sealing test has failed; when the pressure holding time is less than the set time, and the pressure difference change value of the sealing cover 1 is greater than or equal to the set pressure difference change value, it is judged that the sealing test has failed.

[0090] In this embodiment, by setting clear time and pressure difference change value standards, the sealing performance can be judged more accurately, the influence of human factors is reduced, and the reliability and consistency of the test results are improved. This method can complete the test in a shorter time, improve the test efficiency, and save a lot of time, especially when frequent tests are required.

[0091] As an alternative implementation, in step S3, the specific method for determining the contact position between the device to be detected and the wall and / or the sealing performance of the wall covered is:

[0092] The leakage rate of the measuring part is automatically calculated according to the leakage rate calculation formula of the pressure change method; when the leakage rate is within the set leakage rate range, it is judged that the sealing test has passed; when the leakage rate exceeds the set leakage rate range, it is judged that the sealing test has failed.

[0093] The formula for calculating the leakage rate using the pressure change method is:

[0094]

[0095] Where: T f - hourly leakage rate; t-test duration, min; P1-absolute pressure in the sealing cover at the beginning (external atmospheric pressure minus negative pressure), Pa; P n - absolute pressure in the sealed cover at the end (external atmospheric pressure minus negative pressure), Pa; T1- initial temperature in the sealed cover, K; T n - The temperature inside the sealing hood at the end, K.

[0096] It should be noted that when the pressure change method leakage rate calculation formula is used for positive pressure testing, the absolute pressure in the formula is changed accordingly.

[0097] If the leakage rate is within the design range, the control terminal interface will pop up "Sealing test successful", otherwise it will pop up "Sealing test failed, please check the leak point".

[0098] In this embodiment, by automatically calculating the leakage rate, the influence of human factors is reduced, the accuracy and reliability of the test results are improved, and more objective data support can be provided to ensure the consistency of the test results. The method of automatically calculating the leakage rate can complete the test in a shorter time, thereby improving the test efficiency. By setting a unified leakage rate range standard, the test process can be easily standardized, which helps to use the same standard in different test occasions and equipment, ensuring the consistency and comparability of the test results. During the test process, the pressure changes and leakage rate can be monitored in real time, and problems can be found and measures can be taken in time, which helps to quickly locate the location of poor sealing and facilitate subsequent repair work.

[0099] As a further improved implementation method, when the contact position between the equipment to be tested and the wall and / or the sealing of the covered wall is tested for the first time, there are many leaks and the pressure in the sealing cover 1 may not reach the set pressure value. At this time, the method of testing the leaks while pressing can be adopted, so that the location of the poor seal can be quickly found in the early stage, and the leaks can be dealt with in time to avoid the accumulation of problems and reduce the workload of subsequent repairs. After the leaks are dealt with, the one-key detection function can be used to quickly complete the leakage check, which can ensure that the final test results are more reliable, reduce the risk of poor overall sealing performance due to undetected leaks, and avoid multiple rework during the comprehensive test process, which not only saves time, but also reduces the cost of repeated testing and repairs.

[0100] As a further improved implementation, when the pressure in the sealing cover 1 cannot be maintained, the other side of the wall where the detection device is located is pressurized or negatively pressured to detect leaks, thereby finding the leaks and taking corresponding measures. In this embodiment, when the sealing cover 1 cannot maintain pressure, leak detection is performed on the other side of the wall. By performing double-sided detection on the wall, more potential leaks can be covered, ensuring that all possible leak locations are detected, thereby improving the comprehensiveness of leak detection.

[0101] After step S3, when a leak is detected, the other side of the wall where the detection device is located is tested for leaks; when the detected leak size is larger than the set leak size, or when the sealing cover 1 cannot be maintained, the leak position is marked and the leak is processed.

[0102] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. A local sealing leakage detection device, characterized in that: include: A sealing cover (1), wherein the sealing cover (1) covers the device to be detected and is in sealing contact with the wall, and a local sealed detection area is formed between the sealing cover (1) and the wall; A power device (2), wherein the power device (2) is suitable for pressurizing or evacuating the sealing cover (1) to a set pressure and detecting the sealing performance of the sealing cover (1); A control terminal (3), wherein the control terminal (3) is suitable for controlling the power device (2) to pressurize or evacuate the sealing cover (1), and receiving detection information fed back by the power device (2), and then comparing the detection information with the set information to determine the contact position between the device to be detected and the wall and / or the sealing performance of the covered wall.

2. A local sealing leakage detection device according to claim 1, characterized in that: The sealing cover comprises a sealing cover body and a fitting portion fitted with a wall, and the fitting portion is made of herringbone-shaped retractable and deformable rubber.

3. A local sealing leakage detection device according to claim 1, characterized in that: The power device (2) comprises: A pump body, the pump body being connected to the local sealing detection area through a pipeline, and the controlled end of the pump body being connected to the output end of the control terminal (3); A detection component, wherein the detection component is used to detect operating condition information inside the sealing cover (1).

4. A local sealing leakage detection device according to claim 3, characterized in that: The pump body is a positive pressure pump or a vacuum pump.

5. A local sealing leakage detection device according to claim 3, characterized in that: The sealing cover (1) is provided with at least one pressure sampling port and / or at least one temperature sampling port; The detection component comprises at least one pressure gauge and / or at least one thermometer, wherein the pressure gauge is arranged in the pressure sampling port and connected to the control terminal (3) via a pressure transmitter, and the thermometer is arranged in the temperature sampling port and connected to the control terminal (3) via a temperature transmitter.

6. A local sealing leakage detection device according to any one of claims 1 to 5, characterized in that: The sealing cover (1) is arranged on a detachable telescopic bracket, and the telescopic bracket is suitable for supporting the sealing cover and can drive the sealing cover to move.

7. A local sealing leakage detection method, characterized in that: The method is carried out based on the local sealing leakage detection device according to any one of claims 1 to 6, and comprises the following steps: S1. The sealing cover (1) is set at the position where the device to be tested contacts the wall, and the sealing cover (1) completely covers the device to be tested; S2. Start the power device (2) to pressurize or draw negative pressure on the sealing cover (1) so that the pressure inside the sealing cover (1) reaches the set pressure; S3. The sealing cover (1) is pressurized, and based on the pressure difference change information of the sealing cover (1) within a set time, the contact position between the device to be tested and the wall and / or the sealing performance of the covered wall are determined.

8. A local sealing leakage detection method according to claim 7, characterized in that: In step S3, the specific method for determining the contact position between the device to be detected and the wall and / or the sealing performance of the wall covered is: Set the pressure difference change value within the set time; When the pressure holding time reaches the set time or the pressure difference change value of the sealing cover (1) within the set time is within the set pressure difference change value range, the detection ends; After the test is completed, the pressure holding time is compared with the set time, and the pressure difference change value of the sealing cover (1) is compared with the set pressure difference change value: When the pressure holding time is the same as the set time, and the pressure difference change value of the sealing cover (1) is less than the set pressure difference change value, it is determined that the sealing test has passed; when the pressure holding time is the same as the set time, and the pressure difference change value of the sealing cover (1) is greater than the set pressure difference change value, it is determined that the sealing test has failed; when the pressure holding time is less than the set time, and the pressure difference change value of the sealing cover (1) is greater than or equal to the set pressure difference change value, it is determined that the sealing test has failed.

9. A local sealing leakage detection method according to claim 7, characterized in that: In step S3, the specific method for determining the contact position between the device to be detected and the wall and / or the sealing performance of the wall covered is: The leakage rate of the measuring part is automatically calculated according to the leakage rate calculation formula of the pressure change method; when the leakage rate is within the set leakage rate range, it is judged that the sealing test has passed; when the leakage rate exceeds the set leakage rate range, it is judged that the sealing test has failed; The leakage rate calculation formula of the pressure change method is: Where: T f - hourly leakage rate; t-test duration; P1-absolute pressure in the sealing cover at the beginning, Pa; P n - absolute pressure in the sealed cover at the end; T1- temperature in the sealed cover at the beginning; T n - The temperature inside the enclosure at the end.

10. A local sealing leakage detection method according to any one of claims 7 to 9, characterized in that: When testing the sealing of the contact point between the equipment to be tested and the wall and / or the wall it covers for the first time, use the method of testing the leak point while pressing; after the leak point is handled, conduct a comprehensive leakage inspection; And / or, the method is to perform local sealing detection during the installation of the equipment to be detected; and / or, when the pressure in the sealing cover (1) cannot be maintained, the other side of the wall where the device to be tested is located is pressurized or negatively pressurized; And / or, after step S3, when a leak is detected, a leak detection is performed on the other side of the wall where the detection device is located; when the size of the detected leak is larger than the set leak size, or when the sealing cover (1) cannot be maintained, the leak position is marked and the leak is processed.

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