Sealing test device for chemical fume hood

Abstract

The utility model discloses a sealing test device for a chemical fume hood, which comprises a smoke generator arranged in an inner cavity of the 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.

Description

Technical Field

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

[0002] Chemical fume hoods are a widely used piece of laboratory equipment in general chemical or biological laboratories. Specifically, they provide users with an operating space that is moderately isolated from the external environment and offer a degree of personal protection for laboratory personnel, preventing them from being harmed by chemical substances during the experimental process and preventing the chemicals involved in the experiment 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. Accordingly, 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 carried out 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. As a result, in actual applications, the sealing tests of most chemical fume hoods cannot be guaranteed to be completed regularly, posing a hidden danger to the corresponding laboratory environment and the safety of relevant 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 moderately reduce the testing cost is an important technical problem that technical personnel in this field currently need to solve. Utility Model Content

[0007] The utility model aims to provide a chemical fume hood sealing test device, which can simply and efficiently perform a sealing test on the chemical fume hood, and has a low testing cost.

[0008] In order to solve the above technical problems, the utility model 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 being tested, the first laser generating assembly including two first laser generators that are symmetrically arranged and mutually radiate to form a first laser curtain.

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

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

[0011] Preferably, the device further 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 opposed to form a third laser curtain, and the third laser curtain is perpendicular to the first laser curtain and the second laser curtain respectively.

[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, the apparatus further comprises 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 head of the camera device faces the inner cavity of the tested chemical fume hood.

[0014] The utility model also provides a chemical fume hood sealing test method, which uses the chemical fume hood sealing test device as described in any one of the above items, including the following steps:

[0015] The smoke generator and the first laser generator are respectively activated, and the smoke emitted by the smoke generator is mixed with the existing airflow in the inner cavity of the chemical fume hood under test, so that the smoke gradually spreads in the inner cavity of the chemical fume hood under test, 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 of 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;

[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 failure of the sealing structure.

[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 multiple times, and the recorded image files are transmitted 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.

[0019] Compared to the aforementioned background technology, the chemical fume hood seal test device provided by the present invention operates by placing a smoke generator and a first laser generator assembly in place on the main structure of the chemical fume hood being tested, ensuring connectivity between the interior of the chemical fume hood being tested and the laboratory ventilation system. During the seal test, the smoke generator and the first laser generator are activated separately. The smoke emitted by the smoke generator mixes with the existing airflow within the interior of the chemical fume hood being tested, causing the smoke to gradually spread within the interior of the chemical fume hood being tested. Lasers emitted by the two first laser generators are directed toward each other, forming 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 and diffuses 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 seal test device simulates the gas diffusion state inside the chemical fume hood under test by emitting smoke from a smoke generator. When the chemical fume hood experiences a seal failure or structural leakage, the smoke passes through a first laser curtain emitted by a first laser generating assembly positioned at a specific location, where it is reflected and displayed as the color of the first laser curtain. This visually displays the gas leakage direction and corresponding seal failure location of the chemical fume hood under test, allowing personnel to promptly and quickly inspect and maintain the corresponding leaking parts of the chemical fume hood under test, ensuring that the chemical fume hood under test meets the requirements of laboratory operating conditions. The entire seal test process of the chemical fume hood seal test device can be completed only by the coordinated operation of the smoke generator and the first laser generating assembly, and the test results can be intuitively reflected by the color of the light curtain displayed by the smoke passing through the laser curtain. This significantly improves the efficiency of chemical fume hood seal testing and reduces operational difficulty. Furthermore, the entire test process does not require the use of relatively expensive materials and supporting equipment such as tracer gas, significantly reducing the application cost of chemical fume hood seal testing and optimizing the operating adaptability of the chemical fume hood seal 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 following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0021] Figure 1 An axonometric view of the arrangement 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 of the tested chemical fume hood showing no leakage of smoke from the interior cavity;

[0023] Figure 3 for Figure 1 A side perspective view of the tested chemical fume hood's inner 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 utility model 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.

[0031] In order to enable those skilled in the art to better understand the present invention, the present invention will be described in further detail below with reference to 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 includes two first laser generators 11 that are symmetrically arranged and mutually radiate to form a first laser curtain 110.

[0034] During operation, the smoke generator 10 and the first laser generator assembly are positioned on the main structure of the chemical fume hood 20 being tested, ensuring connectivity between the interior cavity 21 of the chemical fume hood 20 being tested and the laboratory ventilation system. During the seal test, the smoke generator 10 and the first laser generator 11 are activated separately. The smoke emitted by the smoke generator 10 mixes with the existing airflow within the interior cavity 21 of the chemical fume hood 20 being tested, causing the smoke to gradually spread within the interior cavity 21 of the chemical fume hood 20 being tested. Lasers emitted by the two first laser generators 11 are directed toward each other, forming 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 be reflected by 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 current sealing structure failure at the air inlet 22 of the 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 intuitively displaying 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 assembly to cooperate to complete, and the test results 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 testing 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 20 sealing test and optimizes the working condition adaptability of the chemical fume hood sealing test device.

[0039] Generally, the two first laser generators 11 can be symmetrically spaced apart along the width direction of the air inlet 22 of the inner cavity 21 of the tested chemical fume hood 20, or can be symmetrically spaced apart 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 corresponding chemical fume hood 20 sealing detection accuracy and detection efficiency.

[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 at the same time, it can also avoid 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 radiate to form a second laser curtain 120.

[0042] During the seal test of the chemical fume hood 20, the second laser generator 12 is activated synchronously with the aforementioned smoke generator 10 and first laser generator 11, so that the lasers emitted by the two second laser generators 12 face each other, forming a second laser curtain 120 between the two second laser generators 12. If the smoke emitted by the smoke generator 10 gradually diffuses to the first laser curtain 110 under the influence of the existing airflow within the inner cavity 21 of the tested chemical fume hood 20 and then continues to diffuse to the second laser curtain 120, it indicates that the sealing structure of the sealing door panel 23 is also defective or damaged, allowing the gas within the inner cavity 21 of the tested chemical fume hood 20 to escape to the external environment through the sealing door panel 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 quickly and promptly 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 seal testing apparatus may further include a third laser generating assembly disposed within the inner cavity 21 of the chemical fume hood 20 being tested. The third laser generating assembly includes two third laser generators 13 symmetrically arranged and aligned with each other to form a third laser curtain 130. Generally, the third laser generators 13 may be disposed directly on top of the smoke generator 10 to provide a more suitable extension space for the third laser curtain 130.

[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 be reflected 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 understand and analyze the sealing state of the inner cavity 21 of the tested chemical fume hood 20 in a timely manner based on this. If there is local structural damage and leakage in the inner cavity 21, the smoke in the inner cavity 21 will be more inclined to spread and move toward the location where the structural damage and leakage occur. In this way, the staff can promptly determine the location where the sealing structure fails in the inner cavity 21 of the tested chemical fume hood 20, and then promptly repair and maintain the sealing structure at the corresponding location.

[0045] In fact, in specific equipment layout and operational applications, multiple laser generating assemblies can be arranged on the main structure of the chemical fume hood 20 being tested. Each laser generating assembly is composed of two laser generators that are symmetrically spaced apart in pairs, so as to form corresponding laser curtains at multiple detection locations of the chemical fume hood 20 being tested, thereby marking the direction of smoke diffusion and spread and the locations where structural leakage and sealing structure failure may exist, thereby further optimizing the corresponding sealing test effect and test efficiency. As for the specific layout position of the laser generators of each laser generating assembly, it should match the airflow path in the inner cavity 21 of the chemical fume hood 20 being tested, and can be flexibly adjusted and selected according to the specific operating conditions and test requirements of the different chemical fume hoods being tested. In principle, any arrangement that can ensure the smoke diffusion marking effect at the corresponding location is acceptable.

[0046] On this basis, the 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 four, five, or even more laser generating assemblies are arranged on the main structure of the chemical fume hood 20 being tested, the colors of the corresponding laser curtains should also be ensured to be different. This ensures that the simulated smoke used for testing will reflect and display the color of the laser curtain at each working position when passing through the laser curtains at the corresponding working positions. The color of the laser curtain at each position is unique, allowing workers to more intuitively and quickly identify the specific location of sealing structure failure and leakage, avoiding confusion among workers at different detection marking locations. This further improves the efficiency and accuracy of seal testing for the chemical fume hood 20 being tested, making the operation of the chemical fume hood seal testing device simpler and more 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 further include a communication-connected camera device and an image analysis device. The camera device is arranged outside the air inlet 22 of the chemical fume hood 20 being tested, and the camera head of the camera device is oriented toward the inner cavity 21 of the chemical fume hood 20 being tested, so that the single camera device can capture as much space and position of the air inlet 22 and the inner cavity 21 as possible. 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 testing efficiency and test accuracy.

[0049] During the seal test, the camera device can be activated simultaneously with the activation of each smoke generator 10 and laser generating assembly. As smoke passes through the first laser curtain 110 and reflects the color of the light curtain of the first laser curtain 110, the camera device continuously records the smoke at the first laser curtain 110 multiple times. The recorded image files are transmitted to the image analysis device, which compares and analyzes the image files to determine the smoke diffusion rate and, therefore, infer whether the sealing performance of the chemical fume hood 20 being tested meets the operating conditions standard.

[0050] Correspondingly, when the smoke passes through other laser screens and reflects the light curtain color of the laser screen at the corresponding position, the camera device can also continuously record the smoke state at the corresponding laser screen 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 screen, thereby determining whether the sealing structure performance at this position meets the corresponding working 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 adaptability to working conditions 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, including the steps of:

[0054] The smoke generator 10 and the first laser generator 11 are activated respectively. The smoke emitted by the smoke generator 10 mixes 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. 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 be reflected by 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 current sealing structure failure at the air inlet 22 of the 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] Furthermore, in specific equipment layout and operational applications, two or more laser generating assemblies can be arranged on the main structure of the chemical fume hood 20 being tested. Each laser generating assembly is composed of two laser generators arranged symmetrically at intervals in pairs, so as to form corresponding laser curtains at multiple detection locations of the chemical fume hood 20 being tested, to indicate the direction of smoke diffusion and spread, as well as the locations 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 layout position of the laser generators of each laser generating assembly, it should match the airflow path in the inner cavity 21 of the chemical fume hood 20 being tested, and can be flexibly adjusted and selected according to the specific operating conditions and test requirements of the different chemical fume hoods being tested. In principle, any arrangement that can ensure the smoke diffusion marking effect at the corresponding location is acceptable.

[0058] On this basis, if two or more laser generating assemblies are arranged on the main structure of the chemical fume hood 20 being tested, the color of the laser curtain generated by each corresponding laser generating assembly should also be guaranteed to be different. In this way, when the simulated smoke used for testing passes through the laser curtain at different working positions, it can be reflected and present the color of the light curtain at the corresponding position. The light curtain color at different positions is unique, so that workers can more intuitively and quickly understand the specific location of sealing structure failure and leakage, and avoid workers confusing different detection marking positions. This further improves the seal detection efficiency and detection accuracy of the chemical fume hood 20 being tested, making the operation and use of the chemical fume hood seal testing device simpler and more 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. 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 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 20 currently being tested meets the operating condition standards.

[0060] In summary, the chemical fume hood seal test device provided in the present invention operates by placing the smoke generator and the first laser generator assembly in place on the main structure of the chemical fume hood being tested, ensuring connectivity between the interior cavity of the chemical fume hood being tested and the laboratory ventilation system. During the seal test, the smoke generator and the first laser generator are activated separately. The smoke emitted by the smoke generator mixes with the existing airflow within the interior cavity of the chemical fume hood being tested, causing the smoke to gradually spread within the interior cavity of the chemical fume hood being tested. Lasers emitted by the two first laser generators are directed toward each other, forming 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 and diffuses 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 seal test device simulates the gas diffusion state inside the chemical fume hood under test by emitting smoke from a smoke generator. When the chemical fume hood experiences a seal failure or structural leakage, the smoke passes through a first laser curtain emitted by a first laser generating assembly positioned at a specific location, where it is reflected and displayed as the color of the first laser curtain. This visually displays the gas leakage direction and corresponding seal failure location of the chemical fume hood under test, allowing personnel to promptly and quickly inspect and maintain the corresponding leaking parts of the chemical fume hood under test, ensuring that the chemical fume hood under test meets the requirements of laboratory operating conditions. The entire seal test process of the chemical fume hood seal test device can be completed only by the coordinated operation of the smoke generator and the first laser generating assembly, and the test results can be intuitively reflected by the color of the light curtain displayed by the smoke passing through the laser curtain. This significantly improves the efficiency of chemical fume hood seal testing and reduces operational difficulty. Furthermore, the entire test process does not require the use of relatively expensive materials and supporting equipment such as tracer gas, significantly reducing the application cost of chemical fume hood seal testing and optimizing the operating adaptability of the chemical fume hood seal 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 above describes in detail the chemical fume hood seal test device and the chemical fume hood seal test method using the chemical fume hood seal test device provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only intended to facilitate understanding of the method and core concept of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such 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 chemical fume hood being tested, wherein the first laser generating assembly comprises two first laser generators that 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 provided 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 assembly arranged on the outer side of the sealed door panel of the tested chemical fume hood, and the first laser generating assembly 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 that are symmetrically arranged and face 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 radiate each other to form a third laser curtain, and the third laser curtain is perpendicular to the first laser curtain and the second laser curtain respectively.

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 camera device and an image analysis device that are communicatively connected. 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.

Images