Focusing device for preconcentrator

Abstract

The utility model discloses a focuser for a preconcentrator, which comprises a shell, a refrigerant pipeline, an interlayer sleeve and a sample transmission pipe, the interlayer sleeve is sleeved on the sample transmission pipe, the interlayer sleeve and the sample transmission pipe are arranged in the refrigerant pipeline, and the refrigerant pipeline is arranged in a cavity enclosed by the shell; the refrigerant pipeline is further provided with a first branch pipe used for leading refrigerants into the refrigerant pipeline, two pipe openings of the refrigerant pipeline and a pipe opening of the first branch pipe penetrate through the outer wall of the shell, the refrigerant pipeline is provided with a plurality of through holes used for spraying out the refrigerants, and the outer wall of the shell is further provided with a refrigerant outlet communicated with the cavity. The air conditioner has the advantages of being simple in structure, low in use cost, capable of achieving efficient utilization of refrigerants and the like.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of gas detection equipment, in particular to a focuser used for a pre-concentrator. Background Art

[0002] In VOC pre-concentration instruments, the focuser is a key component that mainly plays the role of secondary concentration and focusing of the target compounds so that the sample can be more efficiently introduced into subsequent analytical instruments (such as gas chromatographs) for detection. The focuser can replace manual injection needle injection to ensure the consistency of injection.

[0003] Existing cooling methods for focusing devices mainly include Stirling cooling, electronic cooling, and refrigerant cooling. Stirling cooling is rarely used due to its high cost. Electronic cooling is limited by power, cooling efficiency, equipment size, noise, and vibration. The maximum cooling temperature can only reach -80°C. However, there are hundreds of common VOCs, with boiling points ranging from 120°C to -126°C. Therefore, it is not possible to effectively capture VOC target substances below the cooling temperature through low temperatures. Refrigerant cooling temperatures can reach -200°C, so most existing technologies use refrigerant spraying onto heat conductors to cool the target substances through the heat conductors. How to effectively utilize refrigerant is a difficult problem for various manufacturers. After the refrigerant is sprayed onto the heat conductor, it only makes short-term, localized contact. A large amount of refrigerant needs to be continuously sprayed to cover the heat conductor. Large amounts of refrigerant input will cause significant temperature fluctuations. After flowing off the heat transfer element, the refrigerant is typically discharged directly. The discharged gas contains a large amount of vaporized liquid refrigerant (a semi-liquid, semi-gas state), resulting in significant waste. The refrigerant, typically liquid nitrogen or helium, is very expensive, leading to high equipment operating costs and requiring frequent refrigerant tank replacement. How to effectively utilize refrigerant is a pressing technical challenge facing those skilled in the art. Utility Model Content

[0004] In view of the technical problems existing in the prior art, the utility model provides a focuser for a pre-concentrator which has a simple structure, low use cost and can realize efficient utilization of refrigerant.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A focuser for a pre-concentrator comprises a shell, a refrigerant pipe, an interlayer sleeve and a sample transmission tube, wherein the interlayer sleeve is sleeved on the sample transmission tube, the interlayer sleeve and the sample transmission tube are arranged in the refrigerant pipe, and the refrigerant pipe is arranged in a chamber surrounded by the shell; the refrigerant pipe is also provided with a first branch pipe for passing the refrigerant into the refrigerant pipe, the two pipe openings of the refrigerant pipe and the pipe opening of the first branch pipe both pass through the outer wall of the shell, the refrigerant pipe is provided with a plurality of through holes for spraying the refrigerant, and the outer wall of the shell is also provided with a refrigerant outlet connected to the chamber.

[0007] As a further improvement of the present invention: the refrigerant pipe, the interlayer sleeve and the sample transmission pipe are all U-shaped tubes.

[0008] As a further improvement of the present invention: the two pipe openings of the refrigerant pipe are connected to the shell through a first sealing assembly.

[0009] As a further improvement of the present invention: the first sealing assembly includes a sealing joint, a first sealing ferrule and a first ferrule nut.

[0010] As a further improvement of the present invention: it also includes a three-way joint, the first interface of the three-way joint is connected to the interlayer sleeve, the second interface of the three-way joint is used to introduce heating gas, the third interface is sealed by a second sealing assembly, and one end of the sample transfer tube passes through the first interface and the third interface of the three-way joint.

[0011] As a further improvement of the present invention: the first interface and the barrier sleeve are sealed and connected via a third sealing assembly.

[0012] As a further improvement of the present invention: the second sealing assembly includes a second sealing ferrule and a second ferrule nut.

[0013] As a further improvement of the present invention: the third sealing assembly includes a third sealing ferrule and a third ferrule nut.

[0014] As a further improvement of the present invention: the sample transmission tube is a capillary metal tube or a quartz tube.

[0015] As a further improvement of the present invention: the barrier sleeve is a thin-walled structure.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] The focuser for the pre-concentrator of the utility model is designed with a refrigerant pipe and an interlayer sleeve. A smaller cavity is formed between the refrigerant pipe and the interlayer sleeve. The cavity is a flow channel for the refrigerant. Due to the small volume of the cavity, only a small amount of refrigerant is needed to fill the cavity. The interlayer sleeve and the sample transmission tube arranged in the interlayer sleeve can be quickly cooled by the flow of the refrigerant in the cavity, thereby realizing the first efficient refrigeration; the refrigerant entering the refrigerant pipe will be sprayed out through multiple through holes on the refrigerant pipe after flowing, forming a mist that can be quickly vaporized, taking away a large amount of heat, reducing the temperature in the cavity of the shell, preventing external heat from being introduced, reducing temperature fluctuations, and realizing secondary refrigeration. The utility model can achieve a better refrigeration effect by consuming very little refrigerant, greatly improving the utilization rate of the refrigerant, and reducing the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a side view of the utility model in a specific embodiment.

[0019] Figure 2 It is a top view of the utility model in a specific embodiment.

[0020] Figure 3 yes Figure 1 Cross-sectional view at AA in the middle.

[0021] Figure 4 yes Figure 2 Cross-sectional view at the middle BB.

[0022] Figure 5 It is a three-dimensional diagram of the refrigerant pipeline in a specific embodiment of the utility model.

[0023] Figure 6 It is a cross-sectional view of the refrigerant pipeline of the utility model installed in the shell.

[0024] Figure 7 yes Figure 6 Cross-sectional view at CC.

[0025] Legend:

[0026] 1. Shell; 2. Refrigerant pipe; 3. Interlayer sleeve; 4. Sample transfer tube; 5. Chamber; 6. First branch pipe; 7. Through hole; 8. Refrigerant outlet; 9. First sealing assembly; 91. Sealing joint; 92. First sealing ferrule; 93. First ferrule nut; 10. T-joint; 101. First interface; 102. Second interface; 103. Third interface; 11. Second sealing assembly; 111. Second sealing ferrule; 112. Second ferrule nut; 12. Third sealing assembly; 121. Third sealing ferrule; 122. Third ferrule nut. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1 to 7 As shown, this embodiment discloses a focuser for a pre-concentrator, including a shell 1, a refrigerant pipe 2, an interlayer sleeve 3 and a sample transmission tube 4, the interlayer sleeve 3 is sleeved on the sample transmission tube 4, the interlayer sleeve 3 and the sample transmission tube 4 are arranged in the refrigerant pipe 2, and the refrigerant pipe 2 is arranged in a chamber 5 surrounded by the shell 1; the refrigerant pipe 2 is also provided with a first branch pipe 6 for passing the refrigerant into the refrigerant pipe 2, the two pipe openings of the refrigerant pipe 2 and the pipe opening of the first branch pipe 6 all pass through the outer wall of the shell 1, the refrigerant pipe 2 is provided with a plurality of through holes 7 for spraying the refrigerant, and the outer wall of the shell 1 is also provided with a refrigerant outlet 8 connected to the chamber 5.

[0029] The focuser for the pre-concentrator of this embodiment is designed with a refrigerant pipe 2 and an interlayer sleeve 3. A smaller cavity is formed between the refrigerant pipe 2 and the interlayer sleeve 3. The cavity is a flow channel for the refrigerant. Due to the small volume of the cavity, only a small amount of refrigerant is needed to fill the cavity. The refrigerant flows in the cavity to quickly cool the interlayer sleeve 3 and the sample transmission tube 4 arranged in the interlayer sleeve 3, thereby achieving the first efficient refrigeration; the refrigerant entering the refrigerant pipe 2 will be ejected through the multiple through holes 7 on the refrigerant pipe 2 after flowing, and the refrigerant will quickly vaporize to form a mist, taking away a large amount of heat, reducing the temperature in the chamber 5 of the shell 1, preventing external heat from being introduced, reducing temperature fluctuations, and achieving secondary refrigeration. The utility model can achieve a better refrigeration effect by consuming very little refrigerant, greatly improving the utilization rate of the refrigerant, and reducing the cost of use.

[0030] In this embodiment, the refrigerant pipe 2, the interlayer sleeve 3, and the sample transfer tube 4 are all U-shaped tubes. Furthermore, in a preferred embodiment, the refrigerant pipe 2 is a U-shaped metal tube, the first branch pipe 6 is welded to the U-shaped metal tube, and the two ends of the refrigerant pipe 2 are welded to the outer wall of the shell 1. The U-shaped tube design can extend the cooling time of the refrigerant in the sample transfer tube 4 to a certain extent.

[0031] In this embodiment, the sample transmission tube 4 is a capillary metal tube. In other embodiments, the sample transmission tube 4 may be a quartz tube.

[0032] In this embodiment, the two pipe openings of the refrigerant pipe 2 are connected to the shell 1 through a sealing assembly 9. Furthermore, in a preferred embodiment, the first sealing assembly 9 includes a sealing joint 91, a first sealing ferrule 92 and a first ferrule nut 93. The sealing joint 91 is welded to the shell 1 and is connected to the refrigerant pipe 2. The interlayer sleeve 3 adopts a low-temperature-resistant flexible thin-walled tube with a diameter smaller than the refrigerant pipe 2. The interlayer sleeve 3 passes through the U-shaped refrigerant pipe 2. The sealing joint 91 forms a seal between the interlayer sleeve 3 and the shell 1 through the first sealing ferrule 92 and the first ferrule nut 93, ensuring that the refrigerant cannot leak from the sealing joint 91 after entering the refrigerant pipe 2. The refrigerant entering from the first branch pipe 6 can only flow along the refrigerant pipe 2 and be ejected from the through hole 7 into the chamber 5. The refrigerant vaporization will be accelerated during the ejection process.

[0033] In this embodiment, a three-way connector 10 is also included. The three-way connector 10 is a T-shaped structure. The first interface 101 of the three-way connector 10 is connected to the interlayer sleeve 3. The second interface 102 of the three-way connector 10 is used to introduce heating gas. The third interface 103 is sealed by a second sealing assembly 11. One end of the sample transmission tube 4 passes through the first interface 101 and the third interface 103 of the three-way connector 10. The second sealing assembly 11 includes a second sealing ferrule 111 and a second ferrule nut 112.

[0034] In this embodiment, the first interface 101 is sealed to the barrier sleeve 3 via a third sealing assembly 12, which includes a third sealing ferrule 121 and a third ferrule nut 122. The second sealing ferrule 111 and the third sealing ferrule 121 have different sizes to achieve sealing of pipes of different diameters.

[0035] The heating gas enters from the second interface 102. Since the third interface 103 is sealed by the second sealing component 11, when the heating gas valve is opened, the refrigerant valve is closed, which can ensure that the heating gas enters from one end of the interlayer sleeve 3. The heating gas flows in one direction and heats the sample transmission tube 4. Since the specific heat capacity of the sample transmission tube 4 is extremely small, it can be heated rapidly, so that the condensed and accumulated sample is quickly heated and vaporized. One end of the sample transmission tube 4 is connected to the pre-concentrator, and the other end is connected to the detector. The sample in the sample transmission tube 4 moves under the drive of the carrier gas and enters the detector.

[0036] Working principle: When the sample enters the sample transfer tube 4, the refrigerant valve is opened, and the refrigerant enters the refrigerant pipe 2 through the first branch pipe 6, and flows along the cavity between the refrigerant pipe 2 and the interlayer sleeve 3, quickly cooling the interlayer sleeve 3 and the sample transfer tube 4, achieving the first high-efficiency refrigeration; as the refrigerant continues to flow to the through hole 7, the refrigerant will be ejected through the through hole 7, the refrigerant will quickly vaporize to form a mist, taking away a large amount of heat, lowering the temperature in the chamber 5, and achieving secondary refrigeration; when sample testing is required, the heating valve is opened, and the refrigerant valve is closed at this time, and the heating gas enters the interlayer sleeve 3 from the second interface 102 of the three-way connector 10, and flows unidirectionally to heat the sample transfer tube 4, so that the condensed and accumulated sample is quickly heated and vaporized, and the sample enters the detector driven by the carrier gas.

[0037] The above are only preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be pointed out that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A focuser for a preconcentrator, characterized in that: The invention comprises a shell (1), a refrigerant pipe (2), an interlayer sleeve (3) and a sample transmission pipe (4), wherein the interlayer sleeve (3) is sleeved on the sample transmission pipe (4), the interlayer sleeve (3) and the sample transmission pipe (4) are arranged in the refrigerant pipe (2), and the refrigerant pipe (2) is arranged in a chamber (5) surrounded by the shell (1); the refrigerant pipe (2) is also provided with a first branch pipe (6) for the refrigerant to pass into the refrigerant pipe (2), the two pipe openings of the refrigerant pipe (2) and the pipe opening of the first branch pipe (6) both pass through the outer wall of the shell (1), the refrigerant pipe (2) is provided with a plurality of through holes (7) for spraying the refrigerant, and the outer wall of the shell (1) is also provided with a refrigerant outlet (8) communicating with the chamber (5).

2. The focuser for a preconcentrator according to claim 1, characterized in that The refrigerant pipe (2), the interlayer sleeve (3) and the sample transmission pipe (4) are all U-shaped tubes.

3. The focuser for a preconcentrator according to claim 1, characterized in that: The two pipe openings of the refrigerant pipe (2) are connected to the shell (1) via a first sealing assembly (9).

4. The focuser for a preconcentrator according to claim 3, characterized in that: The first sealing assembly (9) comprises a sealing joint (91), a first sealing ferrule (92) and a first ferrule nut (93).

5. The focuser for a preconcentrator according to claim 1, characterized in that: The invention also includes a three-way connector (10), wherein a first interface (101) of the three-way connector (10) is connected to the interlayer sleeve (3), a second interface (102) of the three-way connector (10) is used to introduce heating gas, a third interface (103) of the three-way connector (10) is sealed by a second sealing component (11), and one end of the sample transmission tube (4) passes through the first interface (101) and the third interface (103) of the three-way connector (10).

6. The focuser for a preconcentrator according to claim 5, characterized in that: The first interface (101) is sealed to the barrier sleeve (3) via a third sealing assembly (12).

7. The focuser for a preconcentrator according to claim 5, characterized in that: The second sealing assembly (11) comprises a second sealing ferrule (111) and a second ferrule nut (112).

8. The focuser for a preconcentrator according to claim 6, characterized in that: The third sealing assembly (12) comprises a third sealing ferrule (121) and a third ferrule nut (122).

9. The focuser for a preconcentrator according to any one of claims 1 to 8, characterized in that: The sample transmission tube (4) is a capillary metal tube or a quartz tube.

10. The focuser for a preconcentrator according to any one of claims 1 to 8, characterized in that: The interlayer sleeve (3) is a thin-walled structure.

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