Thermal desorption tube standard sample preparation instrument

Abstract

The thermal desorption tube standard sample preparation instrument comprises a box body, a gas inlet assembly and a thermal desorption assembly are arranged in the box body, and the gas inlet assembly and the thermal desorption assembly are communicated through a six-way selector valve; the output end of the thermal desorption assembly is communicated with a mass flow controller and a vacuum pump; the gas inlet assembly comprises a standard gas two-way valve, an internal standard two-way valve, a substitute two-way valve and a nitrogen two-way valve; the standard gas two-way valve, the internal standard two-way valve, the substitute two-way valve and the nitrogen two-way valve are respectively communicated with the six-way selector valve; a valve heater is further arranged in the box body and used for heating the six-way rotary valve. The thermal analysis assembly comprises a first analysis passage, a second analysis passage, a third analysis passage, a fourth analysis passage, a fifth analysis passage and a sixth analysis passage which are connected between the six-way selector valve and the flow controller.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal analysis, in particular to a thermal analysis tube standard sample preparation instrument. Background Art

[0002] The Thermal Desorption Tube Standard Sample Preparation System is a precision instrument specifically designed for preparing standards for thermal desorption tubes. Its primary function is to accurately and efficiently inject specific compounds or mixtures into the thermal desorption tube in a quantitative manner, thereby preparing standard samples with accurate concentrations and compositions.

[0003] Disadvantages of existing thermal desorption tube standard sample preparation instruments:

[0004] Currently, standard sample preparation mainly uses liquid standards with methanol as the solvent, which requires manual dilution and preparation. The human factor has a great influence, and different people have different results. The methanol solvent in the liquid standard has a great influence, and the separation degree of benzene is poor. The human body is prone to inhalation of harmful substances during manual dilution, which is harmful to the health of operators. The liquid standard can only be used once after opening, which wastes the standard sample. According to the method requirements, the liquid standard needs to be purged with 50-100ml / min nitrogen at 50 degrees for 3-5 minutes, but currently no laboratories have this condition. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a thermal desorption tube standard sample preparation instrument to solve the above-mentioned defects.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] A thermal desorption tube standard sample preparation instrument, comprising:

[0008] The box body is provided with an air intake component and a thermal analysis component, and the air intake component and the thermal analysis component are connected through a six-way selection valve; the output end of the thermal analysis component is connected to a mass flow controller and a vacuum pump.

[0009] In one or more embodiments of the present invention, the air intake assembly includes a two-way valve for standard gas, a two-way valve for internal standard, a two-way valve for substitute and a two-way valve for nitrogen, and the two-way valve for standard gas, the two-way valve for internal standard, the two-way valve for substitute and the two-way valve for nitrogen are respectively connected to the six-way selection valve.

[0010] In one or more embodiments of the present invention, a valve heater is further provided in the box body, and the valve heater is used to heat the six-way rotary valve.

[0011] In one or more embodiments of the present invention, the thermal decomposition component includes a first decomposition passage, a second decomposition passage, a third decomposition passage, a fourth decomposition passage, a fifth decomposition passage, and a sixth decomposition passage connected between a six-way selection valve and a flow controller; the first decomposition passage, the second decomposition passage, the third decomposition passage, the fourth decomposition passage, the fifth decomposition passage, and the sixth decomposition passage are all connected to a thermal decomposition tube and a two-way valve.

[0012] In one or more embodiments of the present invention, a semiconductor refrigerator is further provided in the box body, and the semiconductor refrigerator is used to cool the thermal desorption tube.

[0013] Beneficial effects of the utility model:

[0014] The utility model proposes a thermal desorption tube standard sample preparation instrument with a high-precision injection system, which can accurately control the amount of injected substances and also has a good temperature control function to ensure the stability and accuracy of samples during the preparation process; the thermal desorption tube standard sample preparation instrument uses standard gas to automatically prepare standard sample tubes without solvent interference, has a more sensitive response to benzene series substances, and has sharper separation and peak shape, saves standard samples, and one bottle of standard gas can be used for more than one year, does not require manual dilution and standard preparation, and does not volatilize organic solvents, thereby protecting the health of operators; the standard sample flow rate and standard sample volume are controlled by a mass flow controller, so that the gas flow rate can be accurately measured and controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the present utility model. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for protection, but merely represents selected embodiments of the present invention. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0017] Example 1: In this embodiment, Figure 1As shown, a thermal desorption tube standard sample preparation instrument includes a housing, wherein an air intake assembly and a thermal desorption assembly are disposed within the housing. The air intake assembly and the thermal desorption assembly are connected via a six-way selector valve 1. The output end of the thermal desorption assembly is connected to a mass flow controller 2 and a vacuum pump 3. The vacuum pump is located at the end of the mass flow controller 2.

[0018] In this embodiment, the six-way selection valve 1 has six interfaces, and the selection and switching of different flow paths can be achieved by rotating or switching the position of the valve. When in different positions, the connectivity between the interfaces changes, thereby guiding the fluid to flow along a specific path.

[0019] Mass flow controllers (MFCs) can very accurately measure and control gas flow. They typically operate based on either thermal or differential pressure principles. For example, a thermal MFC determines flow rate by measuring the amount of heat removed by the gas. As gas flow increases, the amount of heat removed increases. A sensor detects this change and, through internal control circuitry, adjusts the valve opening to achieve precise flow control.

[0020] The vacuum pump is a device for extracting gas to achieve a relative vacuum state in a closed space. The vacuum pump 3 adopts existing technology, and its specific structure is not described here.

[0021] In one or more embodiments of the present invention, the air intake assembly includes a standard gas two-way valve 4, an internal standard two-way valve 5, a substitute two-way valve 6 and a nitrogen two-way valve 7, and the standard gas two-way valve 4, the internal standard two-way valve 5, the substitute two-way valve 6 and the nitrogen two-way valve 7 are respectively connected to the six-way selection valve 1.

[0022] In this embodiment, the two-way valve is a common and basic fluid control device. It has two ports, which determine whether the fluid can pass through and the amount of flow by controlling the opening and closing of the valve. There are various types of two-way valves, and the most common ones are stop valves, ball valves, butterfly valves, etc. The stop valve cuts off the fluid by the contact between the valve disc and the valve seat. It has good sealing performance and is suitable for occasions with high sealing requirements. The valve core of the ball valve is a sphere, which is easy to operate and has low fluid resistance. It is often used in pipelines that require fast switching and large diameters. The valve core of the butterfly valve is a disc with a compact structure, small space occupation and relatively low cost. The input of a total of 4 gases, namely, standard gas, internal standard, substitute and nitrogen, is controlled respectively by the standard gas two-way valve 4, the internal standard two-way valve 5, the substitute two-way valve 6 and the nitrogen two-way valve 7.

[0023] In one or more embodiments of the present invention, a valve heater 8 is further provided in the box body, and the valve heater 8 is used to heat the six-way rotary valve 1.

[0024] In this embodiment, the valve heater 8 is a device specifically used to heat the valve. The main function of the valve heater is to ensure that the valve can operate normally in a low temperature environment and prevent the medium inside the valve from solidifying, clogging, or affecting the sealing performance of the valve due to low temperature.

[0025] In one or more embodiments of the present invention, the thermal desorption component includes a first desorption passage 9, a second desorption passage 10, a third desorption passage 11, a fourth desorption passage 12, a fifth desorption passage 13 and a sixth desorption passage 14 connected between the six-way selection valve 1 and the flow controller 2; the first desorption passage 9, the second desorption passage 10, the third desorption passage 11, the fourth desorption passage 12, the fifth desorption passage 13 and the sixth desorption passage 14 are all connected to a thermal desorption tube 15 and a two-way valve 16.

[0026] In this example, the thermal desorption tubes are primarily used to hold and adsorb the standard sample to be prepared. The specific adsorbent filled within them effectively adsorbs the compounds in the standard sample, ensuring the stability and accuracy of the standard. These thermal desorption tubes undergo rigorous screening and processing to ensure the consistency and reliability of their adsorption performance.

[0027] In one or more embodiments of the present invention, a semiconductor cooler 17 is further provided in the box body, and the semiconductor cooler 17 is used to cool the thermal desorption tube 15 .

[0028] In this embodiment, semiconductor refrigeration can provide precise temperature control for the thermal desorption tube standard sample preparation instrument. This is crucial for maintaining the stability and accuracy of the standard sample. When preparing certain temperature-sensitive standard samples, semiconductor refrigeration can quickly reduce the temperature to the required range and maintain stability to prevent changes or volatilization of the standard sample components. It can also effectively reduce temperature fluctuations and ensure consistency during the standard sample preparation process. Compared with traditional refrigeration methods, semiconductor refrigeration has a faster response speed and can respond to temperature changes more promptly. In addition, the size of semiconductor refrigeration is relatively small, which is suitable for instruments and equipment with space constraints such as thermal desorption tube standard sample preparation instruments, and helps to achieve a compact design of the instrument.

[0029] The box is also provided with a built-in power supply, which can also be directly connected to external AC power. The built-in power supply is electrically connected to the standard gas two-way valve 4, the internal standard two-way valve 5, the substitute two-way valve 6, the nitrogen two-way valve 7, the valve heater 8, the semiconductor refrigerator 17, the two-way valve 16, the mass flow controller 2 and the vacuum pump 3; the outer surface of the box is also equipped with a power switch and a human-computer interaction display.

[0030] The working principle of this utility model:

[0031] This instrument uses a two-way valve 4 for standard gas, a two-way valve 5 for internal standard, a two-way valve 6 for substitute, and a two-way valve 7 for nitrogen to control the input of four gases: standard gas, internal standard, substitute, and nitrogen. These gases are connected to six thermal desorption tubes 15 through a six-way selector valve 1. Two-way valves are then used to control the gas path of each thermal desorption tube. A mass flow controller 2 controls the flow and volume of the gas, and a vacuum pump 3 is used to extract the gas. At a certain flow rate, the standard gas is enriched in different thermal desorption tubes 15 to obtain different volumes and masses, thereby preparing standard tubes with different concentrations.

[0032] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "left," "right," and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the product of the present invention is typically placed when in use, or the positions or locations commonly understood by those skilled in the art. These terms are intended solely to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific position, be constructed, or operate in a specific position. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and the like are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, terms such as "disposed" and "connected" should be understood broadly. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection, an indirect connection through an intermediate medium, or internal communication between two components. A person of ordinary skill in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

Claims

1. A thermal desorption tube standard sample preparation instrument, characterized in that, include: A box body, wherein an air intake assembly and a thermal analysis assembly are arranged in the box body, and the air intake assembly and the thermal analysis assembly are connected via a six-way selection valve (1); the output end of the thermal analysis assembly is connected to a mass flow controller (2) and a vacuum pump (3); The air inlet assembly comprises a standard gas two-way valve (4), an internal standard two-way valve (5), a substitute two-way valve (6) and a nitrogen two-way valve (7), wherein the standard gas two-way valve (4), the internal standard two-way valve (5), the substitute two-way valve (6) and the nitrogen two-way valve (7) are respectively connected to the six-way selection valve (1); A valve heater (8) is also provided in the box body, and the valve heater (8) is used to heat the six-way selection valve (1); The thermal decomposition component comprises a first decomposition passage (9), a second decomposition passage (10), a third decomposition passage (11), a fourth decomposition passage (12), a fifth decomposition passage (13) and a sixth decomposition passage (14) connected between the six-way selection valve (1) and the flow controller (2); the first decomposition passage (9), the second decomposition passage (10), the third decomposition passage (11), the fourth decomposition passage (12), the fifth decomposition passage (13) and the sixth decomposition passage (14) are all connected to a thermal decomposition tube (15) and a two-way valve (16); A semiconductor refrigerator (17) is also provided in the box body, and the semiconductor refrigerator (17) is used to cool the thermal decomposition tube (15).

Images