Device for detecting aldehydes in air

Abstract

The utility model provides a device for detecting aldehydes in air, which comprises an air sampling pump, an integrating sphere, a kit, a light source module and an optical detector, the kit is fixedly arranged on the inner wall of the integrating sphere, the kit comprises a quartz glass box body, fine silica gel is filled in the quartz glass box body, the fine silica gel is coated with toren reagent, and the light source module is connected with the optical detector. The quartz glass box body is provided with an air inlet and an air outlet, the air outlet of the air sampling pump is connected with the air inlet of the quartz glass box body, the integrating sphere is provided with a light incident port and a light emergent port, and the light source module is arranged at the light incident port and is used for emitting incident light into the integrating sphere; and the optical detector is arranged at the light exit port and is used for detecting the intensity of the emergent light. The intensity of the emergent light received by the optical detector is influenced by the reaction degree of the silver mirror of the kit and is positively correlated with the concentration of the aldehydes in the air, so that the concentration of the aldehydes in the air can be judged according to the intensity of the emergent light received by the optical detector.

Description

Technical Field

[0001] The utility model belongs to the technical field of harmful gas detection equipment, in particular to a device for detecting aldehydes in the air. Background Art

[0002] Formaldehyde is a odorless, pungent, harmful substance. Long-term exposure to low doses of formaldehyde can cause chronic respiratory diseases, nasopharyngeal cancer, colon cancer, brain tumors, menstrual disorders, gene mutations in the cell nucleus, cross-linking within the DNA single strand and between DNA and protein, inhibition of DNA damage repair, pregnancy syndrome, chromosomal abnormalities in newborns, leukemia, and decreased memory and intelligence in adolescents.

[0003] Existing formaldehyde detection devices are generally formaldehyde detection kits. The principle of formaldehyde detection kits is mainly based on chemical reactions. Specifically, the chemicals in the kit react with formaldehyde in the air to produce color changes or precipitates, and the concentration of formaldehyde is estimated by colorimetry. These chemicals usually include phenol reagents and specific chemical adsorbents. When formaldehyde reacts with phenol reagents, blue-green compounds are generated, and colorimetric quantification can be performed based on the color depth. However, this method has certain limitations, such as being easily disturbed by factors such as temperature, humidity, and air pressure, and the test results may have errors. Therefore, although portable and fast, the test results of the formaldehyde self-test kit are not completely accurate and are only suitable for preliminary screening. Utility Model Content

[0004] The utility model aims to solve the above technical problems and provide a device for detecting aldehydes in air with high detection result accuracy.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A device for detecting aldehydes in air comprises an air sampling pump, an integrating sphere, a reagent kit, a light source module and an optical detector. The reagent kit is fixedly mounted on the inner wall of the integrating sphere. The reagent kit comprises a quartz glass box body, the interior of the quartz glass box body is filled with fine silica gel, the fine silica gel is coated with Tollen's reagent, an air inlet and an air outlet are provided on the quartz glass box body, the air outlet of the air sampling pump is connected to the air inlet of the quartz glass box body, a light inlet and a light outlet are provided on the integrating sphere, the light source module is arranged at the light inlet for emitting incident light into the interior of the integrating sphere, and the optical detector is arranged at the light outlet for detecting the intensity of the outgoing light.

[0007] As a preferred technical solution, the device for detecting aldehydes in air further comprises a lens, which is fixedly mounted in the integrating sphere, and the incident light irradiates the surface of the quartz glass box body after passing through the lens and reaches the area of ​​the surface of the quartz glass box body.

[0008] After adopting the above technical solution, the utility model has the following advantages:

[0009] The utility model discloses an air aldehyde detection device, and the principle of detecting air aldehyde is as follows: air is collected by an air sampling pump and enters a test kit, and the aldehyde substances in the air will react with Tollen's reagent to generate a silver mirror reaction (Tollen's reagent is a silver-ammine complex, which can be reduced to silver by aldehyde compounds, and the aldehydes are oxidized to corresponding carboxylate ions, and the generated silver is attached to the wall of the test kit and is as bright as a mirror); the incident light of the light source module enters an integrating sphere, and is irradiated onto the test kit through diffuse reflection of the inner wall of the integrating sphere. Since the test kit is made of quartz glass, the intensity of the outgoing light received by the optical detector after the silver mirror reaction occurs will be enhanced through reflection from the test kit; the intensity of the outgoing light received by the optical detector is affected by the degree of the silver mirror reaction of the test kit, and is positively correlated with the concentration of the aldehyde substances in the air.

[0010] Therefore, the device for detecting aldehydes in air of the utility model is not affected by factors such as temperature, humidity, and air pressure, and the detection result has high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of a device for detecting aldehydes in air;

[0012] In the figure:

[0013] 1-gas sampling pump; 2-integrating sphere; 3-reagent box; 4-light source module; 5-optical detector; 6-lens. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0015] like Figure 1 As shown, a device for detecting aldehydes in air includes an air sampling pump 1, an integrating sphere 2, a reagent kit 3, a light source module 4, and an optical detector 5.

[0016] The reagent box 3 is fixedly mounted on the inner wall of the integrating sphere 2. The reagent box 3 comprises a quartz glass box body, the interior of the quartz glass box body is filled with fine silica gel, and the fine silica gel is coated with Tollen's reagent. The quartz glass box body is provided with an air inlet and an air outlet, and the air outlet of the gas sampling pump 1 is connected to the air inlet of the quartz glass box body.

[0017] Compounds containing -CHO (aldehyde group) in organic molecules are called aldehydes, and the general formula is RCHO. Silver ammonia complexes (ammonia silver complexes, also known as Tollen's reagent) can be reduced to silver by aldehyde compounds, and aldehydes are oxidized to corresponding carboxylate ions. The generated silver adheres to the container wall and shines like a mirror. Air is continuously introduced into the reagent box 3, and the aldehyde substances in the air will react with the Tollen's reagent to form a silver mirror on the inner wall of the quartz glass box.

[0018] The integrating sphere 2 is provided with a light inlet and a light outlet. The light source module 4 is arranged at the light inlet to emit incident light into the integrating sphere 2. The optical detector 5 is arranged at the light outlet to detect the intensity of the outgoing light.

[0019] The integrating sphere 2 is a hollow sphere with a white diffuse reflective material coated on the inner wall, also known as a photometric sphere, a light flux sphere, etc. The incident light emitted by the light source module 4 will be diffusely reflected by the inner wall of the integrating sphere 2 and irradiated onto the quartz glass box body, and then reflected by the silver mirror that may be produced on the quartz glass box body to the optical detector 5 at the light outlet.

[0020] The device for detecting aldehydes in air further comprises a lens 6, which is fixedly mounted in the integrating sphere 2. After the incident light passes through the lens 6, it is irradiated onto the surface of the quartz glass box body and reaches the area of ​​the surface of the quartz glass box body. Since the light incident port on the integrating sphere 2 is generally small, in order to make the light reach the area of ​​the surface of the quartz glass box body, the lens 6 generally adopts a concave lens to make the incident light diverge to the surface of the quartz glass box body. The lens 6 can be a single lens or a combination of several lenses.

[0021] The intensity of the emitted light received by the optical detector 5 is affected by the degree of the silver mirror reaction of the reagent kit 3 and is positively correlated with the concentration of aldehydes in the air. Therefore, the concentration of aldehydes in the air can be judged by the intensity of the emitted light received by the optical detector 5 .

[0022] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0023] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A device for detecting aldehydes in air, characterized in that: The invention comprises an air sampling pump, an integrating sphere, a reagent kit, a light source module and an optical detector. The reagent kit is fixedly mounted on the inner wall of the integrating sphere. The reagent kit comprises a quartz glass box body. The interior of the quartz glass box body is filled with fine silica gel. The fine silica gel is coated with Tollen's reagent. The quartz glass box body is provided with an air inlet and an air outlet. The air outlet of the air sampling pump is connected to the air inlet of the quartz glass box body. The integrating sphere is provided with a light inlet and a light outlet. The light source module is arranged at the light inlet to emit incident light into the integrating sphere. The optical detector is arranged at the light outlet to detect the intensity of the outgoing light.

2. The device for detecting aldehydes in air according to claim 1, characterized in that: The device for detecting aldehydes in air also includes a lens, which is fixedly installed in the integrating sphere. After passing through the lens, the incident light irradiates the surface of the quartz glass box body and reaches the area of ​​the surface of the quartz glass box body.

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