Fluorescence detection unit and atomic fluorescence detection device

Abstract

According to the fluorescence detection unit and the atomic fluorescence detection device, a darkroom shell can provide a light-free environment in which to-be-detected gas is combusted through a quartz furnace, the influence of ambient light is avoided, gas flow passes through at least two gas-liquid separators to be subjected to gas-liquid separation for multiple times, so that water vapor in the gas flow is reduced, and the detection efficiency is improved. Due to the fact that the heat insulation piece is arranged and the quartz furnace shell is connected with the side wall of the darkroom shell, temperature-sensitive elements such as the mercury lamp and the light detector are located in the second space, and the temperature-sensitive elements are not prone to falling off. The furnace core, the furnace wire and the multi-stage separation assembly of the quartz furnace are located in the first space, and the heat insulation piece can isolate heat transfer of the first space and the second space, so that the refrigeration assembly can cool the temperature-sensitive element, keep the temperature-sensitive element working in a proper temperature environment and improve the stability, and therefore, the detection effect can be ensured.

Description

Technical Field

[0001] The present application relates to the technical field of element detection, and in particular to a fluorescence detection unit and an atomic fluorescence detection device. Background Art

[0002] Atomic fluorescence spectrometry (AFS) is a highly sensitive analytical technique used to determine elemental concentrations. It quantitatively analyzes the concentration of target elements in a sample by measuring the intensity of fluorescence emitted by atomic vapors excited by a specific light source. AFS is a specialized device designed based on this principle and is particularly suitable for the analysis of trace and ultratrace elements, such as heavy metals like mercury, arsenic, and selenium.

[0003] Numerous atomic fluorescence detectors are currently available on the market. Their technology essentially involves heating the gas under test with a high-temperature furnace filament to generate a flame. This flame is then excited by the elements and produces fluorescence, which is then measured by a PMT. The core of the device is the fluorescence detection unit, housing the quartz furnace. However, current devices suffer from poor gas-liquid separation and temperature-sensitive element stability, and are easily affected by ambient light, which in turn affects detection performance. Summary of the Invention

[0004] The purpose of this application is to provide a fluorescence detection unit and an atomic fluorescence detection device, which can avoid being affected by ambient light, increase flame stability and the life of the quartz furnace filament, keep the temperature sensitive element working in a suitable temperature environment, improve stability, and thus ensure the detection effect.

[0005] The embodiments of the present application can be implemented as follows:

[0006] In a first aspect, the present invention provides a fluorescence detection unit, comprising:

[0007] Darkroom enclosure;

[0008] A quartz furnace extends into the darkroom shell, and the shell of the quartz furnace is connected to the side wall of the darkroom shell;

[0009] a heat insulating member located in the darkroom shell and connected to the furnace shell of the quartz furnace and the outer wall of the quartz furnace to divide the inner space of the darkroom shell into a first space and a second space;

[0010] a multi-stage separation assembly disposed in the first space, the multi-stage separation assembly comprising at least two gas-liquid separators connected in series, the outlet of the multi-stage separation assembly being connected to the furnace core of the quartz furnace;

[0011] A mercury lamp, a light detector and a refrigeration component are arranged in the second space, wherein the mercury lamp points to the quartz furnace, the light detector is used to detect the fluorescent signal; and the refrigeration component is used to provide cooling for the second space.

[0012] In an optional embodiment, the thermal insulation component has a through installation opening, the refrigeration assembly includes a TEC refrigeration plate, the TEC refrigeration plate is fixed to the installation opening, the hot surface of the TEC refrigeration plate faces the first space, and the cold surface of the TEC refrigeration plate faces the second space.

[0013] In an optional embodiment, the refrigeration assembly includes multiple TEC refrigeration sheets, the thermal insulation member is thermal insulation foam, the cold surface of the TEC refrigeration sheet is provided with multiple refrigeration guide sheets, and the outer wall of the gas-liquid separator is coated with a thermal conductive coating.

[0014] In an optional embodiment, a cooling fan is provided on the outer wall of the darkroom shell corresponding to the first space, the negative pressure side of the cooling fan faces the first space, and a plurality of cooling fins are provided on the positive pressure side of the cooling fan.

[0015] In an optional embodiment, temperature sensors are provided in both the first space and the second space.

[0016] In an optional embodiment, a cooling fan is provided on an outer wall of the darkroom shell corresponding to the second space, and a positive pressure side of the cooling fan faces the second space.

[0017] In an optional embodiment, the gas-liquid separator is a cyclone separator, and the top outlet of the previous cyclone separator is connected to the inlet of the next cyclone separator;

[0018] The bottom outlet of a cyclone separator closest to the quartz furnace is connected to the quartz furnace, and the top outlet serves as an exhaust gas outlet connected to the outside.

[0019] In an optional embodiment, the cone angle of the cyclone separator is less than 4°;

[0020] The cone angle of the first cyclone separator is greater than the cone angle of the second cyclone separator.

[0021] In an optional embodiment, the furnace shell of the quartz furnace is provided with two windows, each of which is provided with a window plate, and the mercury lamp and the light detector are respectively opposite to one of the window plates.

[0022] In a second aspect, the present invention provides an atomic fluorescence detection device, comprising the fluorescence detection unit described in any one of the aforementioned embodiments.

[0023] Compared with the prior art, the beneficial effects of the embodiments of the present application include, for example:

[0024] The darkroom shell can provide a light-free environment for the gas to be tested to burn in the quartz furnace, which is convenient for the mercury lamp to excite the flame fluorescence and the light detector to detect the fluorescence signal to determine the light intensity, avoiding the influence of ambient light. The airflow passes through at least two gas-liquid separators for multiple gas-liquid separations to reduce water vapor in the airflow, ensuring the purity and dryness of the gas to be tested entering the quartz furnace for combustion, increasing the flame stability and the life of the quartz furnace filament. Due to the setting of the thermal insulation and the connection between the quartz furnace shell and the side wall of the darkroom shell, the mercury lamp, light detector and other temperature-sensitive elements are located in the second space, and the quartz furnace core, filament and multi-stage separation assembly are located in the first space. The thermal insulation can isolate the heat transfer between the first space and the second space, so that the refrigeration assembly can cool the temperature-sensitive element, keep the temperature-sensitive element working in a suitable temperature environment, improve stability, and thus ensure the detection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1 This is one of the overall structural diagrams of the fluorescence detection unit according to an embodiment of the present application;

[0027] Figure 2 This is the second overall structural diagram of the fluorescence detection unit according to an embodiment of the present application;

[0028] Figure 3 This is a fluid simulation diagram of the fluorescence detection unit;

[0029] Figure 4 This is a simulation diagram of the overall temperature distribution of the fluorescence detection unit;

[0030] Figure 5 This is the simulation diagram of the steady-state temperature data of the light detector;

[0031] Figure 6 This is a simulation diagram of mercury lamp temperature steady-state data;

[0032] Figure 7 This is the simulation diagram of the steady-state temperature data of the cyclone separator;

[0033] Figure 8 Schematic diagram of the bottom angle of the cyclone separator;

[0034] Figure 9 This is the fluid simulation diagram of the cyclone separator;

[0035] Figure 10 The simulation diagram of the fluid flow trajectory and inlet and outlet flow rate data when the bottom angle θ of the cyclone separator is 4°;

[0036] Figure 11 The simulation diagram of the fluid flow trajectory and inlet and outlet flow rate data when the bottom angle θ of the cyclone separator is 6°;

[0037] Figure 12 The simulation diagram of the fluid trajectory and inlet and outlet flow rate data when the bottom angle θ of the cyclone separator is 8°.

[0038] Icons: 10-darkroom shell; 11-first space; 12-second space; 13-cooling fan; 14-air conditioning fan; 15-temperature sensor; 16-heat sink; 17-chimney; 20-quartz furnace; 21-furnace shell; 22-furnace core; 23-furnace wire; 24-height adjustment dial; 25-scale dial; 26-screw guide tube; 30-mercury lamp; 40-light detector; 50-cyclone separator; 51-thermal conductive coating; 53-multi-stage separation group; 60-thermal insulation foam; 70-TEC cooling plate. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0042] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended only to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0043] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0044] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0045] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0046] refer to Figure 1 and Figure 2 The embodiment of the present application discloses a fluorescence detection unit, which includes a darkroom housing 10, a quartz furnace 20, a heat insulation member, a multi-stage separation group 53, a mercury lamp 30, a light detector 40 and a refrigeration assembly.

[0047] The darkroom housing 10 mainly serves to carry and protect various components such as the quartz furnace 20, thermal insulation, multi-stage separation assembly 53, mercury lamp 30, light detector 40 and refrigeration assembly, so that the detection of the gas to be tested can be carried out in a dark environment.

[0048] The quartz furnace 20 extends into the darkroom housing 10 to ignite the gas to be measured, and a furnace shell 21 of the quartz furnace 20 is connected to the side wall of the darkroom housing 10 .

[0049] The heat insulating member is located in the darkroom housing 10 and is connected to the furnace shell 21 of the quartz furnace 20 and the outer wall of the quartz furnace 20 to divide the inner space of the darkroom housing 10 into a first space 11 and a second space 12;

[0050] A multi-stage separation assembly 53 is provided in the first space 11. The multi-stage separation assembly 53 includes at least two gas-liquid separators connected in series. The outlet of the multi-stage separation assembly 53 is connected to the furnace core 22 of the quartz furnace 20. In this way, the gas to be tested and water vapor carried by the carrier gas pass through the gas-liquid separators at least twice for gas-liquid separation, thereby ensuring that the gas to be tested without water vapor passes to the quartz furnace 20 for combustion;

[0051] A mercury lamp 30 , a light detector 40 and a refrigeration assembly are arranged in the second space 12 . The mercury lamp 30 points to the quartz furnace 20 to excite flame fluorescence. The light detector 40 is used to detect the fluorescence signal, thereby inferring the sample concentration through the light intensity.

[0052] The refrigeration component is used to provide coldness for the second space 12 , and plays a role in cooling down temperature-sensitive components such as the mercury lamp 30 and the light detector 40 .

[0053] Based on the above, since the quartz furnace 20, the thermal insulation, the multi-stage separation group 53, the mercury lamp 30, the light detector 40 and the refrigeration assembly are all located in the darkroom housing 10, the darkroom housing 10 can provide a lightless environment for the gas to be tested to burn in the quartz furnace 20, making it easier for the mercury lamp 30 to excite the flame fluorescence and the light detector 40 to detect the fluorescence signal to determine the light intensity, thereby avoiding the influence of ambient light. The airflow passes through at least two gas-liquid separators for multiple gas-liquid separations to reduce water vapor in the airflow, thereby ensuring the purity and dryness of the gas to be tested that is passed into the quartz furnace 20 for combustion, thereby increasing the flame stability. As well as the life of the quartz furnace 20 filament 23, due to the setting of the thermal insulation and the connection between the furnace shell 21 of the quartz furnace 20 and the side wall of the darkroom shell 10, the mercury lamp 30, the light detector 40 and other temperature-sensitive components are located in the second space 12, and the furnace core 22, the furnace filament 23 and the multi-stage separation group 53 of the quartz furnace 20 are located in the first space 11. The thermal insulation can isolate the heat transfer between the first space 11 and the second space 12, so that the refrigeration component can cool the temperature-sensitive component, keep the temperature-sensitive component working in a suitable temperature environment, improve stability, and thus ensure the detection effect.

[0054] In addition, since the quartz furnace 20, thermal insulation, multi-stage separation assembly 53, mercury lamp 30, light detector 40 and refrigeration assembly in the present application are located inside the darkroom housing 10, the structural compactness can be improved and the pipeline length can be shortened.

[0055] The darkroom shell 10 is roughly rectangular in structure, and the thermal insulation is in the form of long sheets, which are arranged along the length direction of the darkroom shell 10. The thermal insulation can be made of insulating foam 60 or other heat-insulating materials. One side of the thermal insulation is connected to the short side wall of the darkroom shell 10, and the other side is connected to the furnace shell 21 of the quartz furnace 20. The top and bottom sides of the thermal insulation are respectively connected to the top wall and bottom wall of the darkroom shell 10. In this way, the thermal insulation and the furnace shell 21 of the quartz furnace 20 can divide the internal space of the darkroom shell 10 into a first space 11 and a second space 12. Of course, the furnace core 22, furnace wire 23, etc. of the quartz furnace 20 are located in the furnace shell 21, and are correspondingly located in the first space 11.

[0056] The furnace shell 21 of the quartz furnace 20 is also attached with heat-insulating foam 60 to prevent the flame temperature from being transferred to the second space 12 through the furnace shell 21 and affecting the mercury lamp 30 and the light detector 40 .

[0057] The furnace core 22 and the furnace wire 23 of the quartz furnace 20 can be raised and lowered relative to the darkroom shell 10 to keep the center of the flame at a certain height to match the height of the mercury lamp 30 and the light detector 40 in the darkroom shell 10.

[0058] Specifically, the furnace core 22 of the quartz furnace 20 can be connected to a wire rod, which extends outside the darkroom shell 10 and is fitted with a dial 25. The part of the wire rod inside the darkroom shell 10 is fitted with a height adjustment disk 24. The height of the quartz furnace 20 can be determined by observing the dial 25 by rotating the wire rod, thereby adjusting the height of the furnace core 22 and the furnace wire 23 of the quartz furnace 20 inside the darkroom shell 10. In order to protect the wire rod, a wire rod guide 26 is fitted outside the wire rod, and the dial 25 and the height adjustment disk 24 are outside the wire rod.

[0059] The furnace shell 21 of the quartz furnace 20 is provided with two windows, each of which is provided with a window plate. The mercury lamp 30 and the light detector 40 are respectively opposite to one of the window plates.

[0060] The darkroom housing 10 is provided with a chimney 17 at the top corresponding to the quartz furnace 20 . The chimney 17 is communicated with the furnace shell 21 to allow flue gas to be discharged from the darkroom housing 10 .

[0061] It should be noted that the height of the center point of the fluorescent flame is greatly affected by the external ambient temperature. Due to the difference in the starting temperature of the airflow and the liquid, the height of the center point of the fluorescent flame will shift up and down with the starting temperature. In winter, the ambient temperature is low, the temperature of the furnace wire 23 is reduced, and the heating time is prolonged; this will cause the fluorescent signal value to move downward.

[0062] The thermal insulation component has a through installation port, and the refrigeration assembly includes a TEC refrigeration plate 70, which is fixed to the installation port. The hot surface of the TEC refrigeration plate 70 faces the first space 11, and the cold surface of the TEC refrigeration plate 70 faces the second space 12. In this way, the TEC refrigeration plate 70 can provide cooling for the second space 12 to ensure the stability of the temperature-sensitive element, and the TEC refrigeration plate 70 can also provide heat for the first space 11 to preheat the gas to be measured, for example, maintaining the temperature of the multi-stage separation group 53 at 50°C. In this way, the starting temperature of the gas to be measured can be controlled to avoid the height of the center point of the flame being affected by the external ambient temperature, thereby improving the overall system stability of the fluorescence detection unit.

[0063] The cooling assembly includes a plurality of TEC cooling fins 70 , and a plurality of cooling guides are provided on the cold surface of the TEC cooling fins 70 to increase the heat exchange rate between the cold surface and the heat in the second space 12 , thereby better maintaining the temperature stability of the light detector 40 and the mercury lamp 30 .

[0064] The outer wall of the gas-liquid separator is coated with a thermal conductive coating 51, which can be made of thermal conductive silicone grease to fully conduct heat to the air flow in the gas-liquid separator, thereby ensuring that the gas entering the core 22 of the quartz furnace 20 is always preheated at high temperature.

[0065] A cooling fan 13 is installed on the outer wall of the darkroom housing 10 corresponding to the first space 11. The negative pressure side of the cooling fan 13 faces the first space 11 to maintain the stability of gas convection within the first air and improve the uniformity of temperature distribution within the first space 11. The positive pressure side of the cooling fan 13 is equipped with multiple heat sinks 16 to improve the heat dissipation rate.

[0066] A cooling fan 14 is provided on the outer wall of the darkroom shell 10 corresponding to the second space 12. The positive pressure side of the cooling fan 14 faces the second space 12, which can realize cold air convection to reach the mercury lamp 30 and the light detector 40, thereby improving the uniformity of temperature distribution in the second space 12.

[0067] Specifically, the gas-liquid separators and quartz furnace 20 are arranged along the length of the darkroom housing 10. The cooling fans 13 are axially aligned with the length of the darkroom housing 10. The cooling fans 13 are mounted on the short sidewalls of the darkroom housing 10. The multi-stage separation assembly 53 is equipped with cooling fans 13 on both sides of the darkroom housing 10 in the width direction. The cooling fans 14 are axially aligned with the length of the darkroom housing 10 and are mounted on the short sidewalls of the darkroom housing 10.

[0068] Temperature sensors 15 are provided in both the first space 11 and the second space 12. The temperature sensors 15 can be temperature probes. In this way, the two temperature sensors 15 can detect and feedback the temperatures of the cold surface and the hot surface of the TEC cooling plate 70 in real time, so as to facilitate the independent real-time adjustment of the power of the TEC cooling plate 70, the power of the cooling fan 14, and the power of the cooling fan 13 to maintain the temperature of the gas-liquid separator, the light detector 40, and the mercury lamp 30.

[0069] For example, when the ambient temperature is 40°C, the overall temperature distribution of the components is as follows: Figures 3 to 7 , the temperature of the mercury lamp 30 and the light detector 40 can be maintained at about 20°C, and the temperature of the gas-liquid separator can be maintained at about 50°C.

[0070] The light detector 40 may be a photomultiplier tube (PMT). The PMT light detector 40 can convert a small amount of photons into measurable electrical signals and greatly amplify these signals through an internal electron multiplication mechanism. It has high sensitivity, thereby improving the accuracy of fluorescence detection.

[0071] The gas-liquid separators and the quartz furnace 20 are arranged along the length direction of the darkroom housing 10 , thereby improving the space utilization rate within the darkroom housing 10 . The gas-liquid separator is a cyclone separator 50, and the top outlet of the previous cyclone separator 50 is connected to the inlet of the next cyclone separator 50 through a pipeline; the bottom outlet of the cyclone separator 50 closest to the quartz furnace 20 is connected to the quartz furnace 20, and the top outlet is connected to the outside as an exhaust gas outlet. In this way, the airflow composed of the carrier gas, the gas to be tested and the water vapor enters from the inlet of the first cyclone separator 50. Since the relative density of the three components - water vapor is much greater than that of the combustible gas to be tested (the relative molecular mass of mercury is 200.59) and greater than that of the carrier gas (the relative molecular mass of argon is 39.9), and the density step difference is large, after the fluid enters the cyclone separator 50 tangentially along the inner wall, the heavier fluid is thrown to the inner wall of the cone section due to centrifugal force and gravity, spirals downward, and is finally discharged from the bottom outlet, while the lighter fluid is squeezed to the center and flows out from the upper port (reference Figure 8 and Figure 9 ), when the fluid passes through the last gas-liquid separator, the water vapor has been basically separated. Since the carrier gas is lighter, it will be discharged from the exhaust port, and the gas to be tested will spiral downward along the wall and be discharged from the bottom outlet, and finally enter the furnace core 22 of the quartz furnace 20 through the pipeline, and then be ignited by the furnace wire 23.

[0072] In addition, the cyclone separation effect is related to the angle θ at the bottom of the separator. The angle θ is twice the 50° taper of the cyclone separator. It has been found through simulation and experiments (e.g. Figures 10 to 12As shown in the figure, under the inlet conditions of equal density and equal flow rate of heavy fluid content, when θ = 4°, the density of the heavy fluid at the lower outlet (outlet2) is about 10% lower than that when θ = 6°, and the heavy fluid content at the upper outlet (outlet1) is also less when θ = 6°. In terms of these two values, the results when θ = 6° and θ = 8° are closer. Therefore, in terms of the cyclone separation effect, θ = 6° and θ = 8° will have better effects than θ = 4°.

[0073] Therefore, when the multi-stage separation group 53 includes only two cyclone separators 50, the bottom wall angle of the first cyclone separator 50 can be set to θ=6°, that is, the cone angle is 3°, so that the residual water vapor can be better separated. After the fluid comes out of the first-stage separator, it undergoes a second-stage separation. The main purpose here is to discharge part of the carrier gas to ensure the uniformity of the combustible gas to be tested to ensure the subsequent flame stability. Since the residual carrier gas does not hinder the gas combustion, the bottom angle of the second-stage cyclone separator 50 (that is, the second cyclone separator 50) can be set to θ<6°, so that a relatively dry and stable gas to be tested can be obtained after passing through the cyclone separation group. Therefore, in this embodiment, the cone angle of the previous cyclone separator 50 can be set to be greater than the cone angle of the next cyclone separator 50, and the cone angle of the cyclone separator 50 is less than 4°, that is, the bottom angle θ≤8° of the cyclone separator 50.

[0074] Of course, it should be noted that the aforementioned angle θ is only for illustrative purposes. In some embodiments, θ can be set according to specific needs.

[0075] In terms of material and structural design, all parts of the fluorescence detection unit of the embodiment of the present application use black matte effect structural parts, such as Figure 2 The pipes and dial 25 shown in the figure are all outside the detection unit housing. The darkroom housing 10 and the boundary between the hot and cold surfaces are separated by insulating foam 60. All optical components including the mercury lamp 30 and the photodiode are installed based on the core housing of the quartz furnace 20 to ensure that they will not shake.

[0076] In addition, an embodiment of the present application further discloses an atomic fluorescence detection device, which includes the fluorescence detection unit of the above embodiment.

[0077] In summary, the embodiments of the present application disclose a fluorescence detection unit and an atomic fluorescence detection device, which have at least the following advantages:

[0078] 1. All structures within the detection unit of this invention are treated with extinction. Compared with other products, all optical path components are installed on a unified basis, and the production tolerance of structural components replaces the assembly tolerance, which reduces the uncertainty of the optical path.

[0079] 2. The two-stage cyclone separation designed with the unique composition of the atomic fluorescent fluid can better ensure the dryness of the gas, thereby increasing the life of the heating furnace wire 23, while also improving the purity of the gas to be tested during combustion and increasing flame stability.

[0080] 3. The clever double-sided application of TEC can better control the starting temperature of the gas to be tested while controlling the temperature sensitive devices, greatly improving the overall instrument's ability to resist ambient temperature changes.

[0081] 4. The overall module has a high light-shielding design to avoid the influence of ambient light.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A fluorescence detection unit, characterized in that: include: Darkroom housing (10); A quartz furnace (20) extends into the darkroom housing (10), and a furnace shell (21) of the quartz furnace (20) is connected to a side wall of the darkroom housing (10); a heat insulating member located in the darkroom housing (10) and connected to the furnace shell (21) of the quartz furnace (20) and the outer wall of the quartz furnace (20) to divide the internal space of the darkroom housing (10) into a first space (11) and a second space (12); a multi-stage separation assembly (53) disposed in the first space (11), the multi-stage separation assembly (53) comprising at least two gas-liquid separators connected in series, the outlet of the multi-stage separation assembly (53) being connected to the furnace core (22) of the quartz furnace (20); A mercury lamp (30), a light detector (40) and a refrigeration assembly are arranged in the second space (12), wherein the mercury lamp (30) points toward the quartz furnace (20), the light detector (40) is used to detect a fluorescent signal, and the refrigeration assembly is used to provide cooling for the second space (12).

2. The fluorescence detection unit according to claim 1, characterized in that The thermal insulation component has a through-mounting opening, and the refrigeration assembly includes a TEC refrigeration sheet (70). The TEC refrigeration sheet (70) is fixed to the mounting opening, with a hot surface of the TEC refrigeration sheet (70) facing the first space (11) and a cold surface of the TEC refrigeration sheet (70) facing the second space (12).

3. The fluorescence detection unit according to claim 2, characterized in that: The refrigeration assembly comprises a plurality of TEC refrigeration sheets (70), the heat insulation member is a heat insulation foam (60), a cold surface of the TEC refrigeration sheet (70) is provided with a plurality of refrigeration guide sheets, and the outer wall of the gas-liquid separator is coated with a heat conductive coating (51).

4. The fluorescence detection unit according to claim 3, characterized in that: A cooling fan (13) is provided on the outer wall of the darkroom shell (10) corresponding to the first space (11), the negative pressure side of the cooling fan (13) faces the first space (11), and a plurality of cooling fins (16) are provided on the positive pressure side of the cooling fan (13).

5. The fluorescence detection unit according to claim 2, characterized in that: Temperature sensors (15) are provided in both the first space (11) and the second space (12).

6. The fluorescence detection unit according to any one of claims 1 to 3, characterized in that: A cooling fan (14) is provided on the outer wall of the darkroom shell (10) corresponding to the second space (12), and the positive pressure side of the cooling fan (14) faces the second space (12).

7. The fluorescence detection unit according to any one of claims 1 to 3, characterized in that: The gas-liquid separator is a cyclone separator (50), and the top outlet of the previous cyclone separator (50) is connected to the inlet of the next cyclone separator (50); The bottom outlet of a cyclone separator (50) closest to the quartz furnace (20) is connected to the quartz furnace (20), and the top outlet serves as an exhaust gas outlet connected to the outside.

8. The fluorescence detection unit according to claim 7, characterized in that: The cone angle of the cyclone separator (50) is less than 4°; The cone angle of the preceding cyclone separator (50) is greater than the cone angle of the following cyclone separator (50).

9. The fluorescence detection unit according to any one of claims 1 to 3, characterized in that: The furnace shell (21) of the quartz furnace (20) is provided with two windows, each of which is provided with a window plate. The mercury lamp (30) and the light detector (40) are respectively opposite to one of the window plates.

10. An atomic fluorescence detection device, characterized in that: The invention comprises the fluorescence detection unit according to any one of claims 1 to 9.

Images