Device for fixing flash evaporation structure in cold trap

Abstract

The utility model provides a device for fixing a flash evaporation structure in a cold trap, which relates to the field of gas detection and comprises a cold trap with a cavity, a first ceramic tube and two first ceramic tube brackets for fixing the first ceramic tube in the cavity of the cold trap, a Peltier is arranged at the bottom of the cold trap and is provided with a cold conduction block, and the cold conduction block is in contact with the first ceramic tube; the quartz tube is arranged in the first ceramic tube; the quartz tube extends outwards from the end part of the first ceramic tube, and the outwards extending part penetrates through the two first ceramic tube brackets and extends outwards; the fixing device further comprises a heating wire, the heating wire is wound on the periphery of the quartz tube, the quartz tube can be easily replaced by the fixing device, and installation of the quartz tube cannot be affected by poor precision of the device.

Description

Technical Field

[0001] The utility model relates to the field of gas detection, in particular to a device for fixing a flash evaporation structure in a cold trap. Background Art

[0002] When an ambient air monitoring instrument collects samples, since the concentration of some target pollutants is relatively low, the instrument device cannot directly monitor the content of the pollutants. Therefore, it is necessary to process the sampled gas by preconcentration-thermal desorption method, and then send the sampled gas into the analysis instrument. In this way, substances with relatively low pollutant content in the air can be enriched, enabling the instrument device to monitor the corresponding pollutants. In this process, the enriched sampled gas needs to go through the process of flash evaporation, that is, the enriched sampled gas is instantaneously heated and desorbed and then enters the analysis instrument. The currently common flash evaporation device is to set a quartz tube at one end of the gas path, with heating wires wound around the quartz tube. By energizing the heating wires to generate heat, the quartz tube can be heated. Currently, the flash evaporation device generally needs to place the quartz tube, heating wires, etc. inside a ceramic tube, and then fix the ceramic tube in the cold trap device. The bottom of the ceramic tube is closely attached to the cold conduction structure, and a Peltier cooler is placed below the cold conduction structure. The currently common problems generally include that the concentricity between the ceramic tube and its fixing device is not good, and the quartz tube is extremely easy to be damaged during the installation process; the contact performance between the ceramic tube and the cold conduction structure and the Peltier cooler is not good, resulting in heat waste and the inability to achieve rapid cooling. This article makes a structural update for the easy damage during the replacement of the quartz tube inside the temperature-controlled cold trap device and the poor contact between the ceramic tube and the refrigeration structure. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a device for fixing a flash evaporation structure in a cold trap to solve the above technical problems.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions to achieve:

[0005] A device for fixing a flash evaporation structure in a cold trap includes a cold trap with a cavity, a first ceramic tube, and two first ceramic tube brackets for fixing the first ceramic tube in the cavity of the cold trap;

[0006] There is a Peltier cooler at the bottom of the cold trap, and the Peltier cooler is equipped with a cold conduction block, and the cold conduction block is in contact with the first ceramic tube;

[0007] It further includes a quartz tube arranged inside the first ceramic tube;

[0008] The quartz tube extends outward from the end of the first ceramic tube, and the outward extending part penetrates through the two first ceramic tube brackets and extends outward; it further includes heating wires, and the heating wires are wound around the periphery of the quartz tube.

[0009] Preferably, the first ceramic tube support includes a stopper fixedly coupled to the cold trap and a stopper extension extending into the inner cavity of the cold trap, and the stopper extension is the fixing portion of the first ceramic tube.

[0010] Preferably, the stopper extension has a first groove, and the first ceramic tube enters the first groove and maintains a spacing from the end of the first groove.

[0011] Preferably, the stopper extension has a slotted opening, and the slotted opening communicates with the space formed when the first ceramic tube enters the first groove, and the communication point is the outlet of the heating wire.

[0012] Preferably, the end of the first ceramic tube is equipped with a tube plug for supporting the quartz tube, and the tube plug has a plurality of holes. Among them, the wire end of the heating wire passes through the holes in the two tube plugs and extends outwards from the communication point.

[0013] Preferably, it further includes a second ceramic tube entering the first ceramic tube, and the end of the second ceramic tube enters the holes in the tube plug, and there is also a temperature sensor in the second ceramic tube.

[0014] Preferably, a second sealing ring is provided at the junction of the stopper and the cold trap.

[0015] Preferably, opposite to the first groove is a second groove provided in the stopper, and the second groove is located in the extension path of the quartz tube;

[0016] The end of the second groove is equipped with a first sealing ring, the first sealing ring tightly encircles the quartz tube, and there is also a gasket in the second groove, and the gasket enters the second groove and presses tightly against the first sealing ring.

[0017] The beneficial effects of the present utility model are:

[0018] 1. The fixing device provided by the present utility model can easily replace the quartz tube without affecting the installation of the quartz tube due to poor device accuracy.

[0019] 2. The present utility model can effectively ensure that the first ceramic tube is in close contact with the cold conduction structure and the Peltier, and the heat conduction and cold conduction are more rapid.

[0020] 3. The present utility model fixes the first ceramic tube with two supports. The fixed end of the first ceramic tube support and the first ceramic tube is of a circular ring structure, and the ceramic tube can be effectively embedded in the support, and the tight fit between the ceramic tube and the two supports is strictly controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of a device for fixing a flash evaporation structure in a cold trap;

[0022] Figure 2 For Figure 1 The sectional view of the structure shown;

[0023] Figure 3 is Figure 2 a plan sectional view of;

[0024] Figure 4 is Figure 1 a combined view of the first ceramic tube and the first ceramic tube support in;

[0025] Figure 5 is Figure 4 the structural diagram of the first ceramic tube after sectioning in;

[0026] Figure 6 is Figure 5 the structural diagram on the other side.

[0027] Reference numerals: 1, cold trap; 2, first ceramic tube support; 21, stop block; 22, stop block extension; 23, slotted opening; 3, first ceramic tube; 4, cold conduction block; 5, quartz tube; 6, Peltier; 7, tube plug; 8, gasket; 9, heating wire; 10, first sealing ring; 11, second sealing ring; 12, second ceramic tube. Specific embodiments

[0028] In order to make the technical means, creative features, achieved purposes and effects realized by the present utility model easy to understand, the following further elaborates the present utility model in conjunction with specific embodiments and the accompanying drawings. However, the following embodiments are only the preferred embodiments of the present utility model and not all. Based on the embodiments in the implementation manners, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present utility model.

[0029] The following describes the specific embodiments of the present utility model with reference to the accompanying drawings.

[0030] Embodiment 1

[0031] In this embodiment, a device for fixing the flash evaporation structure in the cold trap is proposed. Please refer to Figures 1-6 , the device for fixing the flash evaporation structure in the cold trap includes a cold trap 1 with a cavity, a first ceramic tube 3, and two first ceramic tube supports 2 for fixing the first ceramic tube 3 in the cavity of the cold trap 1.

[0032] Please refer to Figure 4 and Figure 5 , the first ceramic tube support 2 includes a stop block 21 fixedly coupled to the cold trap 1 using screws, and a stop block extension 22 extending into the cavity of the cold trap 1. The stop block extension 22 is the fixing part for the first ceramic tube 3.

[0033] Please refer to Figure 2 and Figure 3, the stopper extension 22 is preferably a cylindrical column, and the stopper extension 22 has a first groove, and the end of the first ceramic tube 3 enters the first groove.

[0034] It should be added that the first groove is divided into a wide-mouth groove and a narrow-mouth groove. Among them, the wide-mouth groove faces outward, and the narrow-mouth groove is at the tail of the wide-mouth groove. The end of the above-mentioned first ceramic tube 3 abuts against the groove end of the wide-mouth groove, and a closed space is formed from the end of the first ceramic tube 3 to the groove end of the narrow-mouth groove.

[0035] In this embodiment, the stopper 21 has a second groove, and the second groove is opposite to the above-mentioned first groove. Specifically, the axis of the second groove coincides with that of the first groove, and there is a channel between the first groove and the second groove.

[0036] Please refer to Figures 4-6 , the stopper extension 22 has a slot 23, and the slot 23 communicates with the closed space formed when the first ceramic tube 3 enters the first groove.

[0037] Please refer to Figure 2 and Figure 3 , there is a Peltier 6 at the bottom of the cold trap 1. The Peltier 6 is equipped with a cold conduction block 4, and the cold conduction block 4 is in contact with the bottom of the first ceramic tube 3. There is a quartz tube 5 in the first ceramic tube 3, and there is also a tube plug 7 provided at the end of the first ceramic tube 3 for fixing the quartz tube 5.

[0038] Furthermore, there is a through hole for fixing the quartz tube 5 at the axis of the tube plug 7. Specifically, both ends of the quartz tube 5 are inserted into the nearest tube plug 7 and extend outward from the tube plug 7.

[0039] Furthermore, after the above-mentioned quartz tube 5 extends outward from the tube plug 7, it successively enters the first groove, the channel and the second groove and extends outward.

[0040] This embodiment also particularly provides a sealing ring. Specifically, the sealing ring includes a first sealing ring 10 and a second sealing ring 11 (each first ceramic tube bracket 2 has a first sealing ring 10 and a second sealing ring 11).

[0041] Please refer to Figure 2 , regarding the first sealing ring 10, it is arranged in the second groove. The first sealing ring 10 closely adheres to the groove end of the second groove and tightly sleets the quartz tube 5. In addition, a sealing gasket 8 is also provided to further strengthen the sealing effect of the first sealing ring 10. Specifically, the sealing gasket 8 is filled into the second groove and closely contacts the first sealing ring 10.

[0042] Please continue to refer to Figure 2Regarding the second sealing ring 11, it is located at the joint of the stop block 21 and the cold trap 1. Specifically, there is a groove outside the cold trap 1, which is the fixing groove of the stop block 21. One end of the stop block 21 facing the groove is embedded in the second sealing ring 11. When the stop block 21 is combined with the cold trap 1, the second sealing ring 11 fills the gap at the joint.

[0043] Please refer to Figure 2 and Figure 3 A heating wire 9 is also provided. The heating wire 9 is wound around the outer periphery of the quartz tube 5. Among them, the wiring end of the heating wire 9 passes through the pipe plug 7, and the extended part extends outwards from the communication part between the above-mentioned slotted opening 23 and the sealed space.

[0044] In this embodiment, a second ceramic tube 12 is further provided inside the first ceramic tube 3. Both ends of the second ceramic tube 12 are fixed at the adjacent pipe plugs 7. Further, a temperature sensor is sleeved inside the second ceramic tube 12.

[0045] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0046] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only the preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and all these changes and improvements fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A device for fixing a flash evaporation structure inside a cold trap, characterized in that: A cold trap including a cavity, a first ceramic tube, and two first ceramic tube brackets for fixing the first ceramic tube in the cavity of the cold trap; there is a Peltier at the bottom of the cold trap, the Peltier is equipped with a heat conduction block, and the heat conduction block contacts the first ceramic tube; It further includes a quartz tube arranged inside the first ceramic tube; The quartz tube extends outward from the end of the first ceramic tube, and the outward extending part penetrates through the two first ceramic tube brackets and extends outward; It further includes a heating wire, and the heating wire is wound around the periphery of the quartz tube.

2. The device for fixing the flash evaporation structure in the cold trap according to claim 1, wherein: The first ceramic tube bracket includes a stopper fixedly combined with the cold trap, and a stopper extension extending into the inner cavity of the cold trap, and the stopper extension is the fixing part of the first ceramic tube.

3. A device for fixing the flash evaporation structure in a cold trap according to claim 2, characterized in that: The stopper extension has a first groove, and the first ceramic tube enters the first groove and keeps a distance from the end of the first groove.

4. A device for fixing the flash evaporation structure in a cold trap, characterized in that: The stopper extension has a slot, and the slot communicates with the space formed when the first ceramic tube enters the first groove, and the communication part is the outlet of the heating wire.

5. A device for fixing the flash evaporation structure in a cold trap, characterized in that: The end of the first ceramic tube is equipped with a tube plug for supporting the quartz tube, and the tube plug has a plurality of holes. Among them, the wire ends of the heating wire pass through the holes in the two tube plugs and extend outward from the communication part.

6. A device for fixing the flash evaporation structure in a cold trap, characterized in that: It further includes a second ceramic tube entering the first ceramic tube, and the end of the second ceramic tube enters the holes in the tube plug, and there is also a temperature sensor inside the second ceramic tube.

7. A device for fixing the flash evaporation structure in a cold trap, characterized in that: A second sealing ring is provided at the joint of the stopper and the cold trap.

8. A device for fixing the flash evaporation structure in a cold trap, characterized in that: Opposite to the first groove is a second groove provided in the stopper, and the second groove is located in the extension path of the quartz tube; The end of the second groove is equipped with a first sealing ring, the first sealing ring tightly sleeves the quartz tube, and there is also a gasket in the second groove, and the gasket enters the second groove and presses the first sealing ring tightly.

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