VOC (volatile organic compound) sampling device for automotive upholstery

Abstract

The utility model relates to an automotive upholstery VOC (volatile organic compound) sampling device which comprises a gas conduit connected with a sealing bag, a condenser and a sampling pump, the gas conduit consists of two sections of cylindrical hoses, one section is communicated with the sealing bag, the other section is communicated with the sampling pump, a condensation conduit made of glass or stainless steel is arranged in the condenser, and the sampling pump is arranged in the condensation conduit. The condensing guide pipe is a trapezoidal condensing guide pipe, a heater is arranged on the cylindrical hose on the side of the sampling pump, a heat insulation layer is arranged between the heater and the condenser, the sampling pump guides gas in the sealing bag into the sampling pipe through the two sections of cylindrical hoses and the condensing guide pipe, and the gas in the sealing bag passes through the condenser and then enters the sampling pipe through the heat insulation layer. Water vapor in the gas is liquefied in the condenser when being cooled, and the dehumidified gas is heated to room temperature by the heater and then enters the sampling pipe; the utility model has the advantages of convenience in use, low cost, environment friendliness, light volume, simple structure, convenience in operation and carrying and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile interior decoration parts, in particular to a VOC sampling device for automobile interior decoration parts. Background Art

[0002] When using the bag method to detect volatile organic compounds (VOCs) in automotive interior parts, the automotive interior part samples need to be placed in a special bag and sealed. The bag is filled with a certain amount of nitrogen and the sample is heated at a certain temperature to allow the VOCs in the sample to be released into the gas in the bag. The gas sample in the bag is collected by a gas pump, and benzene hydrocarbons are collected using a TENAX tube, and aldehydes and ketones are collected using a DNPH tube. They are then tested using a gas chromatograph-mass spectrometer and a high-performance liquid chromatograph, respectively.

[0003] However, if the sample is very humid, the air inside the bag will be humid. During VOC sampling, this water vapor will enter the TENAX and DNPH sampling tubes along with the VOCs to be detected, interfering with the adsorption and analysis of the VOC components to be detected, and thus affecting the measurement data. Furthermore, when the TENAX tube is analyzed in a gas chromatograph, the water vapor entering the chromatographic column can affect column efficiency and damage the equipment.

[0004] For example, Chinese Patent Publication No. CN215727110U discloses a sampler condensation device for use in high-humidity environments. This device's cylindrical condenser utilizes the principle that water vapor condenses when cooled to reduce the humidity of the gas, which is then dried with a desiccant. However, there are several issues: the tubular structure of the condenser limits the condensation area, resulting in limited water vapor reduction. When humidity is too high, the water vapor will still enter the next stage with the air. Furthermore, a desiccant is used to absorb water vapor in high-humidity environments, and this desiccant absorbs and reacts with benzene and aldehyde compounds in VOCs, thus affecting VOC detection results.

[0005] For example, Chinese Patent Publication No. CN208459076U discloses a VOC sampling pump front-end dehumidification device. This device utilizes a desiccant to remove water. However, this device presents a problem: the desiccant adsorbs and reacts with benzene and aldehyde compounds in the VOCs being tested, thereby affecting VOC detection results. The desiccant also increases the damping of the collected gas. Utility Model Content

[0006] In view of the above problems, the purpose of this utility model is to provide a VOC sampling device for automotive interior parts, which is used to solve the problem of excessive humidity of samples interfering with data and equipment when testing VOC, so as to overcome the shortcomings of the above-mentioned existing technology.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A VOC sampling device for automobile interior parts, comprising: a gas conduit connected to a sealed bag containing automobile interior part samples, a condenser that wraps part of the gas conduit, and a sampling pump, wherein one end of the gas conduit passes through the condenser and is connected to the sampling pump, and the sampling pump is used to introduce the gas in the sealed bag from the gas conduit into the sampling tube. The improvement made is that the gas conduit is composed of two sections of cylindrical hoses, one section of which is connected to the sealed bag and the other section is connected to the sampling pump, and a condensation conduit made of glass or stainless steel is provided inside the condenser. The condensation conduit is a trapezoidal condensation conduit consisting of a connected straight pipe section and a curved pipe section located below the straight pipe section, and one end of the straight pipe section is connected to the side of the sealed bag. The cylindrical hose of the straight pipe section is connected, and the other end of the straight pipe section is connected to the cylindrical hose on the sampling pump side. A heater is provided on the cylindrical hose on the sampling pump side. The heater is used to heat the cooled gas in the cylindrical hose that passes through the condenser to room temperature. An insulation layer is provided between the heater and the condenser. The insulation layer is provided with an avoidance hole for the cylindrical hose to pass through. The sampling pump introduces the gas in the sealed bag into the sampling tube through two sections of cylindrical hoses and a condensation duct. After the gas in the sealed bag passes through the condenser, the water vapor inside it is cooled and liquefied in the condenser. The dehumidified gas is heated to room temperature by the heater and then enters the sampling tube.

[0009] As a preferred embodiment of the present invention, the diameters of the straight pipe section and the curved pipe section of the condensation conduit are smaller than the diameter of the cylindrical hose.

[0010] As a preferred embodiment of the present invention, the condenser is a hollow cuboid, and ice cubes or ice water are placed inside the hollow cuboid for cooling.

[0011] As a preferred embodiment of the present invention, the heating end of the heater is wrapped around the cylindrical hose on the sampling pump side, and the heating temperature of the heater is 20-25°C.

[0012] As a preferred embodiment of the present invention, the sampling pump is composed of a flow meter, a timer and an air pump.

[0013] The advantages and positive effects of this utility model are: it solves the problem of excessive sample humidity interfering with data and equipment during VOC testing. It has the advantages of being easy to use, low cost, environmentally friendly, lightweight, simple in structure, easy to operate and carry, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0015] Reference numerals: sealing bag 1 , first cylindrical hose 201 , second cylindrical hose 202 , condenser 3 , thermal insulation layer 4 , heater 5 , sampling pump 6 , straight pipe section 701 , curved pipe section 702 . DETAILED DESCRIPTION

[0016] See Figure 1 This embodiment provides a VOC sampling device, comprising: a gas conduit connected to a sealed bag 1 containing automotive interior sample components, a condenser 3, a heat insulation layer 4, a heater 5, a sampling pump 6, and a condensation conduit. The gas conduit comprises a first cylindrical hose 201 and a second cylindrical hose 202. The first cylindrical hose 201 and the second cylindrical hose 202 are hollow, allowing air to flow through. The first cylindrical hose 201 is connected to the sealed bag, and the second cylindrical hose 202 is connected to the sampling pump. The condenser 3 is a hollow rectangular parallelepiped with a glass condensation conduit inside. The condensation conduit is a trapezoidal conduit consisting of a straight section 701 and a curved section 702 located below the straight section 701. The ends of the straight section 701 are connected to the first and second cylindrical hoses 201 and 202. The inner diameters of the straight section 701 and the curved section 702 are slightly smaller than the inner diameter of the gas conduit, which is more conducive to reducing the temperature within the conduit. Ice cubes, ice water and other substances that can reduce temperature are placed inside the condenser 3. The thermal insulation layer 4 is used to isolate the condenser 3 and the heater 5 to reduce heat and cold losses. A through hole is provided on the thermal insulation layer 5, and the through hole is used to pass the second cylindrical hose 202. The heater 5 is wrapped on the outer surface of the second cylindrical hose 202 and is used to heat the second cylindrical hose 202. The heating temperature of the heater 5 is 20-25°C. The sampling pump 6 includes a flow meter, a timer and an air pump, so that the volume of the gas can be collected more accurately. The TENAX sampling tube and the DNPH sampling tube are connected to the sampling pump 6. The sampling pump 6 is used to pour the gas in the sealed bag into the TENAX and DNPH sampling tubes.

[0017] Working principle: When the gas in the sealed bag 1 flows from the first cylindrical hose 201 into the condenser 3 under the power of the sampling pump 6, the straight pipe section 701 and the curved pipe section 702 of the trapezoidal structure help to speed up the gas flow rate. The sudden drop in temperature in the condenser 3 causes the water vapor in the gas to liquefy in the condensation duct of the condenser 3. The trapezoidal condensation duct structure increases the gas condensation contact area and better reduces the humidity in the gas. The gas flows out of the condenser 3, passes through the insulation layer 4, and is restored to room temperature by the heater 5, eliminating the effect of the cooling of the condenser 3 on the volume of the sampled gas, while avoiding the effect of temperature on the reaction efficiency of the DNPH reagent. The gas is then collected into the TENAX sampling tube and the DNPH sampling tube, making the results more accurate.

[0018] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A VOC sampling device for automotive interior parts, comprising: A gas conduit connected to a sealed bag containing samples of automotive interior parts, a condenser that wraps part of the gas conduit, and a sampling pump. The gas conduit passes through one end of the condenser and is connected to the sampling pump. The sampling pump is used to introduce the gas in the sealed bag from the gas conduit into the sampling tube. It is characterized in that the gas conduit consists of two sections of cylindrical hoses, one of which is connected to the sealed bag and the other is connected to the sampling pump. A condensation conduit made of glass or stainless steel is provided inside the condenser. The condensation conduit is a trapezoidal condensation conduit consisting of a connected straight pipe section and a curved pipe section located below the straight pipe section. One end of the straight pipe section is connected to the cylindrical hose on the side of the sealed bag. The other end of the straight pipe section is connected to the cylindrical hose on the sampling pump side. A heater is provided on the cylindrical hose on the sampling pump side. The heater is used to heat the cooled gas in the cylindrical hose that passes through the condenser to room temperature. An insulation layer is provided between the heater and the condenser. The insulation layer is provided with an avoidance hole for the cylindrical hose to pass through. The sampling pump introduces the gas in the sealed bag into the sampling tube through two sections of cylindrical hose and a condensation duct. After the gas in the sealed bag passes through the condenser, the water vapor inside is cooled and liquefied in the condenser. The dehumidified gas is heated to room temperature by the heater and then enters the sampling tube.

2. The VOC sampling device for automotive interior parts according to claim 1, characterized in that: The diameters of the straight pipe section and the curved pipe section of the condensation conduit are smaller than the diameter of the cylindrical hose.

3. The VOC sampling device for automotive interior parts according to claim 1, characterized in that: The condenser is a hollow cuboid, and ice cubes or ice water are placed inside the hollow cuboid for cooling.

4. The VOC sampling device for automotive interior parts according to claim 1, characterized in that: The heating end of the heater is wrapped around the cylindrical hose on the sampling pump side, and the heating temperature of the heater is 20-25°C.

5. The VOC sampling device for automotive interior parts according to claim 1, characterized in that: The sampling pump consists of a flow meter, a timer and an air pump.

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