Chemical fume hood sealing test device and test method

Abstract

The invention discloses a chemical fume hood sealing test device which comprises a smoke generator arranged in an inner cavity of a chemical fume hood and further comprises a first laser generation assembly arranged at an air inlet of the inner cavity of the tested chemical fume hood. The first laser generating assembly comprises two first laser generators which are symmetrically arranged and matched with each other in a correlation mode to form a first laser curtain. The chemical fume hood sealing test device can simply, conveniently and efficiently carry out sealing test on the chemical fume hood, and the test cost is relatively low. The invention further discloses a testing method applying the chemical fume hood sealing testing device.

Description

Technical Field

[0001] The invention relates to the technical field of sealing performance detection equipment for chemical fume hoods used in laboratories, and in particular to a chemical fume hood sealing test device and a test method using the device. Background Art

[0002] In the process of arranging and using supporting equipment in general chemical or biological laboratories, chemical fume hoods are a widely used experimental supporting equipment. Specifically, chemical fume hoods can provide users with an operating space that can be moderately isolated from the external environment, and provide certain personal protection for experimental personnel to prevent relevant personnel from being harmed by chemical substances during experimental operations, and also to prevent the chemical substances involved in the experimental process from causing harm to the surrounding environment.

[0003] On this basis, the internal environment of the chemical fume hood is usually connected to the ventilation system of the laboratory to promptly discharge harmful gases and smoke in the internal environment of the chemical fume hood to avoid pollution and damage to the relevant gas environment in the laboratory. Correspondingly, the sealing performance of the chemical fume hood itself is also an important factor affecting the safe and stable use of the chemical fume hood and the personal safety of experimental personnel.

[0004] In practical applications, in order to ensure that the sealing structure and overall sealing performance of the chemical fume hood can meet the current laboratory working conditions, so as to avoid long-term and frequent experimental operations causing the sealing structure of the chemical fume hood to fail or the sealing performance to decay.

[0005] At present, the sealing test of chemical fume hoods usually needs to be implemented by professional technicians. During the specific implementation process, corresponding tracer gases need to be used. The cost of using these gases is high, and the related sealing test costs are also high. The testing process is cumbersome and complicated, resulting in that the sealing tests of most chemical fume hoods in actual applications cannot be guaranteed to be completed regularly, posing a hidden danger to the corresponding laboratory environment and the safety of related personnel.

[0006] In view of this, how to optimize the sealing test method of chemical fume hoods to make the sealing test more simple and efficient, and appropriately reduce the testing cost is an important technical problem that technical personnel in this field currently need to solve. Summary of the invention

[0007] The object of the present invention is to provide a chemical fume hood sealing test device, which can perform a sealing test on a chemical fume hood simply and efficiently, and the testing cost is low. Another object of the present invention is to provide a chemical fume hood sealing test method using the chemical fume hood sealing test device.

[0008] In order to solve the above technical problems, the present invention provides a chemical fume hood sealing test device, including a smoke generator arranged in the inner cavity of the chemical fume hood, and also including a first laser generating assembly arranged at the air inlet of the inner cavity of the chemical fume hood to be tested, wherein the first laser generating assembly includes two first laser generators that are symmetrically arranged and mutually radiated to form a first laser curtain.

[0009] Preferably, a sealing door panel is opened and closed at the air inlet of the inner cavity of the tested chemical fume hood, and the chemical fume hood sealing test device further comprises a second laser generating assembly arranged on the outer side of the sealing door panel of the tested chemical fume hood, and the first laser generating assembly is located on the inner side of the sealing door panel of the tested chemical fume hood;

[0010] The second laser generating assembly includes two second laser generators which are symmetrically arranged and cooperate with each other to form a second laser curtain.

[0011] Preferably, it also includes a third laser generating assembly arranged in the inner cavity of the chemical fume hood being tested, the third laser generating assembly includes two third laser generators that are symmetrically arranged and mutually radiated to form a third laser curtain, and the third laser curtain is respectively perpendicular to the first laser curtain and the second laser curtain.

[0012] Preferably, the light curtain colors of any two of the first laser curtain, the second laser curtain and the third laser curtain are different.

[0013] Preferably, it also includes a communication-connected camera device and an image analysis device, wherein the camera device is arranged outside the air inlet of the tested chemical fume hood, and the camera of the camera device faces the inner cavity of the tested chemical fume hood.

[0014] The present invention also provides a chemical fume hood sealing test method, using the chemical fume hood sealing test device as described in any one of the above items, comprising the steps of:

[0015] The smoke generator and the first laser generator are respectively started, the smoke emitted by the smoke generator is mixed with the existing airflow in the inner cavity of the tested chemical fume hood, so that the smoke gradually spreads in the inner cavity of the tested chemical fume hood, and the lasers emitted by the two first laser generators are directed toward each other to form a first laser curtain between the two first laser generators;

[0016] If the smoke in the inner cavity of the tested chemical fume hood spreads to the inner cavity air inlet near the tested chemical fume hood and diffuses through the first laser curtain, it means that there is a sealing structure failure at the inner cavity air inlet of the tested chemical fume hood. At the same time, the smoke passing through the first laser curtain will reflect the light curtain color of the first laser curtain under the irradiation of the first laser curtain, so as to intuitively feedback the current sealing structure failure at the air inlet of the tested chemical fume hood;

[0017] If the smoke in the inner cavity of the tested chemical fume hood gradually spreads along with the airflow, but does not pass through the first laser curtain and reflect the color of the light curtain, it means that the sealing effect at the air inlet of the inner cavity of the tested chemical fume hood is good, and there is no sealing structure failure.

[0018] Preferably, the above-mentioned chemical fume hood sealing test device including a camera device and an image analysis device is used, the camera device is started, and when the smoke passes through the first laser curtain and reflects the light curtain color of the first laser curtain, the camera device continuously records the smoke at the first laser curtain for multiple times, and the recorded image files are transmitted to the image analysis device, and the image analysis device compares and analyzes each image file to determine the smoke diffusion rate, thereby inferring whether the sealing performance of the chemical fume hood currently being tested meets the working condition standard.

[0019] Compared with the above background technology, the chemical fume hood sealing test device provided by the present invention, during its operation and use, the smoke generator and the first laser generating assembly are arranged in place on the main structure of the chemical fume hood being tested, and the inner cavity of the chemical fume hood being tested is connected with the laboratory ventilation system. When the sealing test is implemented, the smoke generator and the first laser generator are started respectively, and the smoke emitted by the smoke generator is mixed with the existing airflow in the inner cavity of the chemical fume hood being tested, so that the smoke gradually spreads in the inner cavity of the chemical fume hood being tested, and the lasers emitted by the two first laser generators are mutually reflected to form a first laser curtain between the two first laser generators. In this way, during the subsequent operation of the equipment, if the smoke in the inner cavity of the tested chemical fume hood spreads to the inner cavity air inlet near the tested chemical fume hood and diffuses through the first laser curtain, it means that there is a sealing structure failure at the inner cavity air inlet of the tested chemical fume hood. At the same time, the smoke passing through the first laser curtain will reflect the light curtain color of the first laser curtain under the illumination of the first laser curtain, so as to intuitively feedback the current sealing structure failure at the air inlet of the tested chemical fume hood; if the smoke in the inner cavity of the tested chemical fume hood gradually spreads along with the airflow, but does not pass through the first laser curtain and reflect the light curtain color, it means that the sealing effect at the inner cavity air inlet of the tested chemical fume hood is good, and there is no sealing structure failure. The chemical fume hood sealing test device simulates the gas diffusion state inside the tested chemical fume hood through the smoke emitted by the smoke generator, and when the sealing structure of the chemical fume hood fails or the structure leaks, the smoke will pass through the first laser curtain emitted by the first laser generating assembly arranged at a specific position, so as to be reflected at the first laser curtain and present the light curtain color of the first laser curtain, thereby intuitively showing the gas leakage direction of the chemical fume hood currently being tested and the corresponding sealing structure failure position, so that the staff can promptly and quickly inspect and maintain the corresponding leakage part of the tested chemical fume hood, so that the tested chemical fume hood can ensure that its own sealing can meet the corresponding laboratory working condition application requirements. The entire sealing test process of the chemical fume hood sealing test device only requires the smoke generator and the first laser generating assembly to cooperate to complete, and the test result can be intuitively reflected by the light curtain color presented by the smoke passing through the laser curtain, which greatly improves the sealing test efficiency of the chemical fume hood and reduces the difficulty of operation. In addition, the entire test process does not require the use of relatively expensive materials and supporting equipment such as tracer gas, which greatly reduces the application cost of the chemical fume hood sealing test and optimizes the working condition adaptability of the chemical fume hood sealing test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 An axonometric diagram of the arrangement position of a chemical fume hood sealing test device provided by a specific embodiment of the present invention in the main structure of the chemical fume hood being tested;

[0022] Figure 2 for Figure 1 A side perspective view showing no leakage of smoke from the inner cavity of the tested chemical fume hood;

[0023] Figure 3 for Figure 1 Side perspective view of the tested chemical fume hood's cavity seal structure with smoke leaking from the sealed door panel.

[0024] in:

[0025] 10- Smoke generator;

[0026] 11-first laser generator; 110-first laser curtain;

[0027] 12-second laser generator; 120-second laser curtain;

[0028] 13-third laser generator; 130-third laser curtain;

[0029] 20-Chemical fume hood; 21-Inner cavity; 22-Air inlet; 23-Sealed door panel. DETAILED DESCRIPTION

[0030] The core of the present invention is to provide a chemical fume hood sealing test device, which can simply and efficiently perform a sealing test on the chemical fume hood, and its testing cost is low; and also provides a chemical fume hood sealing test method using the above-mentioned chemical fume hood sealing test device.

[0031] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] Please refer to Figures 1 to 3 .

[0033] In a specific embodiment, the chemical fume hood sealing test device provided by the present invention includes a smoke generator 10 arranged in the inner cavity 21 of the chemical fume hood 20, and also includes a first laser generating assembly arranged at the air inlet 22 of the inner cavity 21 of the chemical fume hood 20 being tested, the first laser generating assembly including two first laser generators 11 that are symmetrically arranged and mutually radiated to form a first laser curtain 110.

[0034] During the operation of the equipment, the smoke generator 10 and the first laser generating assembly are arranged in place on the main structure of the tested chemical fume hood 20, and the inner cavity 21 of the tested chemical fume hood 20 is connected to the laboratory ventilation system. When the sealing test is carried out, the smoke generator 10 and the first laser generator 11 are started respectively, and the smoke emitted by the smoke generator 10 is mixed with the existing airflow in the inner cavity 21 of the tested chemical fume hood 20, so that the smoke gradually spreads in the inner cavity 21 of the tested chemical fume hood 20, and the lasers emitted by the two first laser generators 11 are directed to each other to form a first laser curtain 110 between the two first laser generators 11.

[0035] During the subsequent operation of the equipment, if the smoke in the inner cavity 21 of the tested chemical fume hood 20 spreads to the air inlet 22 of the inner cavity 21 of the tested chemical fume hood 20 and diffuses through the first laser curtain 110, it means that there is a sealing structure failure at the air inlet 22 of the inner cavity 21 of the tested chemical fume hood 20. At the same time, the smoke passing through the first laser curtain 110 will reflect the light curtain color of the first laser curtain 110 under the illumination of the first laser curtain 110, so as to intuitively feedback the sealing structure failure at the air inlet 22 of the current tested chemical fume hood 20.

[0036] If the smoke in the inner cavity 21 of the tested chemical fume hood 20 gradually spreads along with the airflow, but does not pass through the first laser curtain 110 and reflect the color of the light curtain, it means that the sealing effect at the air inlet 22 of the inner cavity 21 of the tested chemical fume hood 20 is good, and there is no failure of the sealing structure.

[0037] The chemical fume hood sealing test device simulates the gas diffusion state inside the tested chemical fume hood 20 through the smoke emitted by the smoke generator 10. When the sealing structure of the chemical fume hood 20 fails or the structure leaks, the smoke will pass through the first laser curtain 110 emitted by the first laser generating assembly arranged at a specific position, thereby reflecting at the first laser curtain 110 and presenting the light curtain color of the first laser curtain 110, thereby being able to intuitively display the gas leakage direction and the corresponding sealing structure failure position of the currently tested chemical fume hood 20, so that the staff can promptly and quickly inspect and maintain the corresponding leakage parts of the tested chemical fume hood 20, so that the tested chemical fume hood 20 can ensure that its own sealing can meet the corresponding laboratory working conditions application requirements.

[0038] The entire sealing test process of the chemical fume hood sealing test device only requires the smoke generator 10 and the first laser generating component to cooperate to complete, and the test result can be intuitively reflected by the color of the light curtain presented by the smoke passing through the laser curtain, which greatly improves the sealing test efficiency of the chemical fume hood 20 and reduces the difficulty of operation. In addition, the entire test process does not require the use of relatively expensive materials and supporting equipment such as tracer gas, which greatly reduces the application cost of the sealing test of the chemical fume hood 20 and optimizes the working condition adaptability of the chemical fume hood sealing test device.

[0039] Generally, the two first laser generators 11 can be arranged symmetrically along the width direction of the air inlet 22 of the inner cavity 21 of the tested chemical fume hood 20, or can be arranged symmetrically along the height direction of the air inlet 22 of the inner cavity 21. In principle, as long as it can be ensured that the first laser curtain 110 formed between the two first laser generators 11 is arranged in a direction perpendicular to the gas flow direction at the air inlet 22, it can be ensured that the smoke diffused to the air inlet 22 can be intuitively and fully reflected when passing through the first laser curtain 110 and present the light curtain color of the first laser curtain 110, so as to ensure the sealing detection accuracy and detection efficiency of the corresponding chemical fume hood 20.

[0040] Specifically, a sealing door panel 23 is usually provided at the air inlet 22 of the inner cavity 21 of the tested chemical fume hood 20, so that after the sealing door panel 23 is closed, the inner cavity 21 of the chemical fume hood 20 can be isolated from the external environment. When the corresponding experimental operation is carried out in the inner cavity 21 of the tested chemical fume hood 20, a relatively stable and independent gas environment can be formed in the inner cavity 21 of the chemical fume hood 20, thereby avoiding interference of the external environment with the corresponding experimental operation, and also avoiding the experimental gas or experimental reagent inside the chemical fume hood 20 from causing harm to the external environment and personnel.

[0041] Correspondingly, the chemical fume hood sealing test device also includes a second laser generating assembly arranged on the outside of the sealing door panel 23 of the chemical fume hood 20 being tested, and the first laser generating assembly is located on the inside of the sealing door panel 23 of the chemical fume hood 20 being tested; the second laser generating assembly includes two second laser generators that are symmetrically arranged and mutually radiated to form a second laser curtain 120.

[0042] When the sealing test of the chemical fume hood 20 is implemented, the second laser generator 12 is started synchronously with the smoke generator 10 and the first laser generator 11 mentioned above, so that the lasers emitted by the two second laser generators 12 are directed to each other, so as to form a second laser curtain 120 between the two second laser generators 12. After the smoke emitted by the smoke generator 10 gradually diffuses to the first laser curtain 110 under the influence of the existing airflow in the inner cavity 21 of the tested chemical fume hood 20, if it continues to diffuse to the second laser curtain 120, it means that the sealing structure at the sealing door plate 23 is also defective or damaged, so that the gas in the inner cavity 21 of the tested chemical fume hood 20 can escape to the external environment through the sealing door plate 23. Similar to the cooperation between the first laser curtain 110 and the smoke mentioned above, the smoke passing through the second laser curtain 120 here will also be reflected and present the light curtain color of the second laser curtain 120, so as to intuitively reflect the escape direction of the smoke in the inner cavity 21 of the tested chemical fume hood 20, so that the staff can promptly and quickly understand the failure position of the sealing structure of the tested chemical fume hood 20, so as to implement repairs and maintenance in time.

[0043] More specifically, the chemical fume hood sealing test device may further include a third laser generating assembly arranged in the inner cavity 21 of the chemical fume hood 20 to be tested, and the third laser generating assembly includes two third laser generators 13 that are symmetrically arranged and mutually opposed to form a third laser curtain 130. Generally, the third laser generator 13 may be directly arranged on the top of the smoke generator 10 so that the third laser curtain 130 can obtain a more suitable extension space.

[0044] When the sealing test is implemented, the third laser generator 13 is turned on synchronously with the laser generators and the smoke generator 10 mentioned above. Therefore, during the implementation of the sealing test, the smoke in the inner cavity 21 of the tested chemical fume hood 20 will pass through the third light curtain when it diffuses and spreads, and the smoke passing through the third light curtain will reflect and present the light curtain color of the third light curtain, so as to intuitively show the diffusion direction and spreading state of the smoke in the inner cavity 21 to the staff. The staff can timely understand and analyze the sealing state of the inner cavity 21 of the tested chemical fume hood 20 based on this. If the inner cavity 21 has local structural damage and leakage, the smoke in the inner cavity 21 will be more inclined to spread and move towards the location where the structural damage and leakage occur. In this way, the staff can timely determine the location where the sealing structure fails in the inner cavity 21 of the tested chemical fume hood 20, and then timely repair and maintain the sealing structure at the corresponding location.

[0045] In fact, in the specific equipment layout and operation application, multiple laser generating components can be arranged on the main structure of the tested chemical fume hood 20, and each laser generating component is composed of two laser generators that are symmetrically arranged in pairs, so as to form corresponding laser curtains at multiple detection positions of the tested chemical fume hood 20, to indicate the direction of smoke diffusion and spread and the position where there may be structural leakage and sealing structure failure, so as to further optimize the corresponding sealing test effect and test efficiency. As for the specific arrangement position of the laser generator of each laser generating component, it should match the airflow path in the inner cavity 21 of the tested chemical fume hood 20, and can be flexibly adjusted and selected according to the specific working conditions and test requirements of different tested chemical fume hoods 20. In principle, as long as it can ensure the smoke diffusion marking effect at the corresponding position, it can be used.

[0046] On this basis, the light curtain colors of any two of the first laser curtain 110, the second laser curtain 120, and the third laser curtain 130 are different. In fact, if 4, 5, or even more laser generating components are arranged on the main structure of the tested chemical fume hood 20, the colors of the corresponding laser curtains should also be guaranteed to be different. In this way, the simulated smoke used for detection can be reflected and present the color of the light curtain at the corresponding position when passing through the laser curtains at different working positions, and the color of the light curtain at different positions is unique, so that the staff can more intuitively and quickly understand the specific location where the sealing structure fails and leaks, and avoid the staff from confusing different detection marking positions, so as to further improve the sealing detection efficiency and detection accuracy of the tested chemical fume hood 20, and make the operation and use of the chemical fume hood sealing test device more convenient and efficient.

[0047] Generally, the third laser curtain is perpendicular to the first laser curtain and the second laser curtain respectively, that is, the main extension surface of the third laser curtain is perpendicular to the main extension surface of the first laser curtain, and the main extension surface of the third laser curtain is also perpendicular to the main extension surface of the second laser curtain, so as to further optimize the coordinated cooperation effect of each laser curtain and improve the sealing detection accuracy and detection efficiency of the tested chemical fume hood.

[0048] On the other hand, the chemical fume hood sealing test device may also include a communication-connected camera device and an image analysis device, wherein the camera device is arranged outside the air inlet 22 of the chemical fume hood 20 being tested, and the camera of the camera device is facing the inner cavity 21 of the chemical fume hood 20 being tested, so that most of the space and position of the air inlet 22 and the inner cavity 21 can be photographed as much as possible by relying on a single camera device. Of course, two or more camera devices may also be arranged on and around the main structure of the chemical fume hood 20 being tested to directly record multiple positions of the chemical fume hood 20 being tested, in order to obtain more detailed and comprehensive sealing test data, meet corresponding sealing test requirements, and improve its test efficiency and test accuracy.

[0049] During the sealing test, when each smoke generator 10 and the laser generating assembly are started, the camera device can be started synchronously. When the smoke passes through the first laser curtain 110 and reflects the light curtain color of the first laser curtain 110, the camera device continuously records the smoke at the first laser curtain 110 for multiple times, and transmits the recorded image files to the image analysis device, which compares and analyzes each image file to determine the smoke diffusion rate, thereby inferring whether the sealing performance of the chemical fume hood 20 currently being tested meets the working condition standard.

[0050] Correspondingly, when the smoke passes through other laser curtains and reflects the light curtain color of the laser curtain at the corresponding position, the camera device can also continuously record the smoke state at the corresponding laser curtain for multiple times, and transmit the recorded image files to the image analysis device, so that the image analysis device can compare and analyze each image file to determine the smoke diffusion rate at the corresponding position of the current laser curtain, thereby determining whether the sealing structure performance at this position meets the corresponding operating condition standards of the chemical fume hood 20 being tested.

[0051] It should be pointed out that, in practical applications, the imaging device may be a camera, a smart phone or other equipment with imaging capabilities, and the image analysis device is generally a computer, so as to use pixel analysis software or other types of image analysis software to compare and analyze the smoke image information recorded by the imaging device.

[0052] In addition, considering the operational convenience and working condition adaptation effect in actual applications, a smoke duct capable of transporting the smoke generated by an external smoke generating device to the inner cavity 21 of the chemical fume hood 20 being tested can be used to replace the smoke generator 10 mentioned in the above scheme, so as to ensure the operation requirements of the chemical fume hood sealing test device under different working conditions and improve its adaptability to working conditions.

[0053] In a specific embodiment, the chemical fume hood sealing test method provided by the present invention uses the chemical fume hood sealing test device as described above, comprising the steps of:

[0054] The smoke generator 10 and the first laser generator 11 are started respectively, and the smoke emitted by the smoke generator 10 is mixed with the existing airflow in the inner cavity 21 of the tested chemical fume hood 20, so that the smoke gradually spreads in the inner cavity 21 of the tested chemical fume hood 20, and the lasers emitted by the two first laser generators 11 are directed toward each other to form a first laser curtain 110 between the two first laser generators 11.

[0055] If the smoke in the inner cavity 21 of the tested chemical fume hood 20 spreads to the air inlet 22 of the inner cavity 21 of the tested chemical fume hood 20 and diffuses through the first laser curtain 110, it means that there is a sealing structure failure at the air inlet 22 of the inner cavity 21 of the tested chemical fume hood 20. At the same time, the smoke passing through the first laser curtain 110 will reflect the light curtain color of the first laser curtain 110 under the illumination of the first laser curtain 110, so as to intuitively feedback the sealing structure failure at the air inlet 22 of the current tested chemical fume hood 20.

[0056] If the smoke in the inner cavity 21 of the tested chemical fume hood 20 gradually spreads along with the airflow, but does not pass through the first laser curtain 110 and reflect the color of the light curtain, it means that the sealing effect at the air inlet 22 of the inner cavity 21 of the tested chemical fume hood 20 is good, and there is no failure of the sealing structure.

[0057] Further, in specific equipment layout and operation applications, two or more laser generating assemblies can be arranged on the main structure of the tested chemical fume hood 20, and each laser generating assembly is composed of two laser generators that are arranged symmetrically at intervals in pairs, so as to form corresponding laser curtains at multiple detection positions of the tested chemical fume hood 20, to indicate the direction of smoke diffusion and spread and the positions where structural leakage and sealing structure failure may exist, so as to further optimize the corresponding sealing test effect and test efficiency. As for the specific arrangement position of the laser generator of each laser generating assembly, it should match the airflow path in the inner cavity 21 of the tested chemical fume hood 20, and can be flexibly adjusted and selected according to the specific working conditions and test requirements of different tested chemical fume hoods 20. In principle, as long as the smoke diffusion marking effect at the corresponding position can be guaranteed.

[0058] On this basis, if two or more laser generating components are arranged on the main structure of the tested chemical fume hood 20, the colors of the laser curtains generated at the corresponding laser generating components should also be guaranteed to be different. In this way, the simulated smoke used for detection can be reflected and present the color of the light curtain at the corresponding position when passing through the laser curtain at different working positions, and the color of the light curtain at different positions is unique, so that the staff can more intuitively and quickly understand the specific location where the sealing structure fails and leaks, and avoid the staff from confusing different detection marking positions, so as to further improve the sealing detection efficiency and detection accuracy of the tested chemical fume hood 20, and make the operation and use of the chemical fume hood sealing test device more simple and efficient.

[0059] Furthermore, when implementing the sealing test of the chemical fume hood 20, the above-mentioned chemical fume hood sealing test device including a camera device and an image analysis device can also be used. The camera device is started, and when the smoke passes through the first laser curtain 110 and reflects the light curtain color of the first laser curtain 110, the camera device continuously records the smoke at the first laser curtain 110 for multiple times, and transmits the recorded image file to the image analysis device. The image analysis device compares and analyzes each image file to determine the smoke diffusion rate, thereby inferring whether the sealing performance of the chemical fume hood 20 currently being tested meets the operating condition standard.

[0060] In summary, the chemical fume hood sealing test device provided in the present invention, during operation, the smoke generator and the first laser generating assembly are arranged in place on the main structure of the chemical fume hood being tested, and the inner cavity of the chemical fume hood being tested is connected to the laboratory ventilation system. When the sealing test is implemented, the smoke generator and the first laser generator are started respectively, and the smoke emitted by the smoke generator is mixed with the existing airflow in the inner cavity of the chemical fume hood being tested, so that the smoke gradually spreads in the inner cavity of the chemical fume hood being tested, and the lasers emitted by the two first laser generators are mutually emitted to form a first laser curtain between the two first laser generators. In this way, during the subsequent operation of the equipment, if the smoke in the inner cavity of the tested chemical fume hood spreads to the inner cavity air inlet near the tested chemical fume hood and diffuses through the first laser curtain, it means that there is a sealing structure failure at the inner cavity air inlet of the tested chemical fume hood. At the same time, the smoke passing through the first laser curtain will reflect the light curtain color of the first laser curtain under the illumination of the first laser curtain, so as to intuitively feedback the current sealing structure failure at the air inlet of the tested chemical fume hood; if the smoke in the inner cavity of the tested chemical fume hood gradually spreads along with the airflow, but does not pass through the first laser curtain and reflect the light curtain color, it means that the sealing effect at the inner cavity air inlet of the tested chemical fume hood is good, and there is no sealing structure failure. The chemical fume hood sealing test device simulates the gas diffusion state inside the tested chemical fume hood through the smoke emitted by the smoke generator, and when the sealing structure of the chemical fume hood fails or the structure leaks, the smoke will pass through the first laser curtain emitted by the first laser generating assembly arranged at a specific position, so as to be reflected at the first laser curtain and present the light curtain color of the first laser curtain, thereby intuitively showing the gas leakage direction of the chemical fume hood currently being tested and the corresponding sealing structure failure position, so that the staff can promptly and quickly inspect and maintain the corresponding leakage part of the tested chemical fume hood, so that the tested chemical fume hood can ensure that its own sealing can meet the corresponding laboratory working condition application requirements. The entire sealing test process of the chemical fume hood sealing test device only requires the smoke generator and the first laser generating assembly to cooperate to complete, and the test result can be intuitively reflected by the light curtain color presented by the smoke passing through the laser curtain, which greatly improves the sealing test efficiency of the chemical fume hood and reduces the difficulty of operation. In addition, the entire test process does not require the use of relatively expensive materials and supporting equipment such as tracer gas, which greatly reduces the application cost of the chemical fume hood sealing test and optimizes the working condition adaptability of the chemical fume hood sealing test device.

[0061] In addition, the chemical fume hood sealing test method provided in the present invention adopts the chemical fume hood sealing test device as described above, and its sealing test process is simple and efficient, and the test cost is low.

[0062] The chemical fume hood sealing test device provided by the present invention and the chemical fume hood sealing test method using the chemical fume hood sealing test device are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A chemical fume hood sealing test device, characterized in that: The method comprises a smoke generator arranged in the inner cavity of a chemical fume hood, and a first laser generating assembly arranged at the air inlet of the inner cavity of the tested chemical fume hood, wherein the first laser generating assembly comprises two first laser generators which are symmetrically arranged and face each other to form a first laser curtain.

2. The chemical fume hood sealing test device according to claim 1, characterized in that: A sealed door panel is opened and closed at the air inlet of the inner cavity of the tested chemical fume hood, and the chemical fume hood sealing test device further includes a second laser generating component arranged on the outer side of the sealed door panel of the tested chemical fume hood, and the first laser generating component is located on the inner side of the sealed door panel of the tested chemical fume hood; The second laser generating assembly includes two second laser generators which are symmetrically arranged and cooperate with each other to form a second laser curtain.

3. The chemical fume hood sealing test device according to claim 2, characterized in that: It also includes a third laser generating assembly arranged in the inner cavity of the chemical fume hood being tested, wherein the third laser generating assembly includes two third laser generators that are symmetrically arranged and mutually radiated to form a third laser curtain, and the third laser curtain is respectively perpendicular to the first laser curtain and the second laser curtain.

4. The chemical fume hood sealing test device according to claim 3, characterized in that: The light curtain colors of any two of the first laser curtain, the second laser curtain and the third laser curtain are different.

5. The chemical fume hood sealing test device according to claim 1, characterized in that: It also includes a video camera and an image analysis device that are communicatively connected. The video camera is arranged outside the air inlet of the tested chemical fume hood, and the camera head of the video camera faces the inner cavity of the tested chemical fume hood.

6. A chemical fume hood sealing test method, characterized in that: The chemical fume hood sealing test device according to any one of claims 1 to 5 comprises the following steps: The smoke generator and the first laser generator are respectively started, the smoke emitted by the smoke generator is mixed with the existing airflow in the inner cavity of the tested chemical fume hood, so that the smoke gradually spreads in the inner cavity of the tested chemical fume hood, and the lasers emitted by the two first laser generators are directed toward each other to form a first laser curtain between the two first laser generators; If the smoke in the inner cavity of the tested chemical fume hood spreads to the inner cavity air inlet near the tested chemical fume hood and diffuses through the first laser curtain, it means that there is a sealing structure failure at the inner cavity air inlet of the tested chemical fume hood. At the same time, the smoke passing through the first laser curtain will reflect the light curtain color of the first laser curtain under the irradiation of the first laser curtain, so as to intuitively feedback the current sealing structure failure at the air inlet of the tested chemical fume hood; If the smoke in the inner cavity of the tested chemical fume hood gradually spreads along with the airflow, but does not pass through the first laser curtain and reflect the color of the light curtain, it means that the sealing effect at the air inlet of the inner cavity of the tested chemical fume hood is good, and there is no sealing structure failure.

7. The chemical fume hood sealing test method according to claim 6, characterized in that: The chemical fume hood sealing test device as described in claim 5 is used, and the camera device is started. When the smoke passes through the first laser curtain and reflects the light curtain color of the first laser curtain, the camera device continuously records the smoke at the first laser curtain for multiple times, and transmits the recorded image files to the image analysis device. The image analysis device compares and analyzes each image file to determine the smoke diffusion rate, thereby inferring whether the sealing performance of the chemical fume hood currently being tested meets the working condition standard.

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