A flow tube device incorporating a spray injection

Abstract

This disclosure provides a flow tube device combined with spray injection, comprising: an outer tube; an inner tube passing through the outer tube and extending beyond the ends of the outer tube at both ends; a first sealing joint disposed at both ends of the outer tube and abutting against the inner tube, for defining a sealed space between the inner tube and the outer tube; an inlet tube inserted from the first end of the inner tube; a second sealing joint sleeved on the inlet tube and sealed to the first end of the inner tube; a liquid inlet tube, one end of which is inserted from the second end of the inlet tube, and the other end of which is used to connect to the liquid to be reacted; and a three-way connector including a first port, a second port, and a third port, wherein the first port is connected to and sealed to the second end of the inlet tube, the liquid inlet tube is inserted from the first port and extends out from the second port, the liquid inlet tube is sealed to the second port, and the third port is used to connect to the gas to be introduced.

Description

Technical Field

[0001] This disclosure relates to a liquid injection device, and more particularly to a flow tube device capable of accurately quantitatively injecting a liquid. Background Technology

[0002] In the exploration and research of chemistry, various liquid samples are encountered, and corresponding sample introduction systems are used. There are two common methods for liquid vaporization: heating the liquid to its vaporization temperature or introducing gas into the liquid sample via bubbling. Both methods have drawbacks. For mixed liquid reagents, due to the different vaporization temperatures of the liquids, situations may arise where sample 1 vaporizes while sample 2 does not, or sample 1 vaporizes while sample 2 has already begun to react. Bubbling injection makes it impossible to accurately calculate the amount of sample introduced, thus hindering the quantification of reactants and products. Summary of the Invention

[0003] In view of this, in order to solve at least some of the above-mentioned technical problems, this disclosure provides a flow tube device combining spray injection, comprising:

[0004] outer tube;

[0005] The inner tube passes through the outer tube and extends beyond the ends of the outer tube at both ends;

[0006] The first sealing joint is disposed at both ends of the outer tube and abuts against the inner tube, and is used to define a sealing space between the inner tube and the outer tube;

[0007] An intake pipe is inserted from the first end of the inner tube;

[0008] The second sealing joint is sleeved on the air intake pipe and sealed to the first end of the inner pipe;

[0009] A liquid inlet pipe, one end of which is inserted into the second end of the air inlet pipe, and the other end of which is used to connect to the liquid to be reacted; and

[0010] The three-way connector includes a first port, a second port, and a third port. The first port is connected to and sealed to the second end of the air inlet pipe. The liquid inlet pipe is inserted through the first port and exits through the second port. The liquid inlet pipe is sealed to the second port. The third port is used to connect to the gas to be introduced.

[0011] According to some embodiments of this disclosure, a sampling hole is provided on the side wall of the outer tube;

[0012] An outlet is provided on the side wall of the inner tube, and the outlet is positioned opposite to the sampling hole; and

[0013] The flow tube device also includes a sampler, one end of which is inserted into the sampling hole and connected to the outlet, and the other end is used to connect to the negative pressure device.

[0014] According to some embodiments of this disclosure, the sampler includes:

[0015] The tapered portion has its tip inserted into the sampling hole, and an opening is provided at the tip. The opening is abutted against or adjacent to the outlet, and the tapered portion is sealed to the sampling hole.

[0016] The transition section, one end of which is connected to the tapered section; and

[0017] The connecting part is connected to the other end of the transition part and is used to connect the negative pressure device.

[0018] According to some embodiments of this disclosure, the diameter of the opening ranges from 50 to 150 μm.

[0019] According to some embodiments of this disclosure, the flow tube device further includes:

[0020] pressure gauge;

[0021] The outer tube has two vent holes on its side wall, which are used to connect the air extraction device and the pressure gauge, respectively.

[0022] According to some embodiments of this disclosure, a recess is provided on the outer side wall of one end of the outer tube, and an insertion hole is provided on the side wall of the recess for insertion along the axial direction of the outer tube; and

[0023] The flow tube device also includes a thermocouple, which is inserted into the socket along the axial direction of the outer tube, and the thermocouple is sealed to the socket.

[0024] According to some embodiments of this disclosure, the inner wall of the outer tube is provided with a strip groove along the axial direction, the strip groove is disposed between the insertion hole and the sampling hole, the thermocouple is inserted in the strip groove, and one end of the thermocouple is close to the outlet on the inner tube.

[0025] According to some embodiments of this disclosure, the two ends of the outer tube further include:

[0026] The transition tube includes a constant diameter section and a variable diameter section. The constant diameter section is connected to the first sealing joint, and the two ends of the variable diameter section are respectively connected to the end of the outer tube and the constant diameter section.

[0027] According to some embodiments of this disclosure, both the outer tube and the inner tube are quartz tubes;

[0028] The air intake pipe is a steel pipe; and

[0029] The inlet tube is a capillary tube.

[0030] According to some embodiments of this disclosure, the first sealing joint includes a vacuum tube joint; and

[0031] The second sealing joint includes a reducing ferrule coupling.

[0032] According to the flow tube device of the above embodiments of the present disclosure, high-speed gas is introduced through the air inlet pipe to atomize the liquid in the liquid inlet pipe, and then the liquid participates in the reaction in the inner tube. This can effectively solve the defects caused by different vaporization temperatures of mixed liquids in related technologies. At the same time, with the help of a flow meter, the liquid can be accurately and quantitatively atomized and introduced into the inner tube to participate in the reaction. Attached Figure Description

[0033] Figure 1 A perspective view of a flow tube device according to an embodiment of the present disclosure is shown schematically;

[0034] Figure 2 An exploded view of a flow tube device according to an embodiment of the present disclosure is shown schematically;

[0035] Figure 3 A schematic cross-sectional view of a flow tube device according to an embodiment of the present disclosure is shown;

[0036] Figure 4 A perspective view of the inner tube of the flow tube device according to an embodiment of the present disclosure is shown schematically;

[0037] Figure 5 A perspective view of the outer tube of the flow tube device according to an embodiment of the present disclosure is shown schematically;

[0038] Figure 6 A perspective view of the first sealing joint of the flow tube device according to an embodiment of the present disclosure is shown schematically;

[0039] Figure 7 A perspective view of the air inlet pipe and the liquid inlet pipe of the flow tube device according to an embodiment of the present disclosure is shown schematically.

[0040] Figure 8 A perspective view of the second sealing joint of the flow tube device according to an embodiment of the present disclosure is shown schematically;

[0041] Figure 9 A perspective view of a tee connector of a flow tube device according to an embodiment of the present disclosure is schematically shown; and

[0042] Figure 10 A perspective view of the collector of the flow tube device according to an embodiment of the present disclosure is shown schematically.

[0043] The meanings of the reference numerals in the above figures are as follows:

[0044] 1-Inner tube;

[0045] 101 - Export;

[0046] 2-Outer tube;

[0047] 201 - Sampling hole; 202 - Vent hole; 203 - Recess;

[0048] 3-Sampler;

[0049] 301 - Tapered portion; 302 - Transition portion; 303 - Connecting portion;

[0050] 4-First sealing joint;

[0051] 5-Second sealing joint;

[0052] 6-Tee connector;

[0053] 301 - First bite; 602 - Second bite; 603 - Third bite;

[0054] 7-Intake pipe;

[0055] 8-Intake pipe;

[0056] 9-Inlet pipe; and

[0057] 10-Transition pipe.

[0058] It should be noted that, for clarity, the dimensions of structures or regions in the accompanying drawings used to describe embodiments of this disclosure may be enlarged or reduced, i.e., these drawings may not be drawn to actual scale. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0060] However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of this disclosure. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of embodiments of this disclosure for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of this disclosure.

[0061] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The term "comprising" as used herein indicates the presence of features, steps, or operations, but does not exclude the presence or addition of one or more other features.

[0062] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0063] When using expressions such as "at least one of A, B, and C," the expression should generally be interpreted in accordance with the meaning commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, and C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.). Similarly, when using expressions such as "at least one of A, B, or C," the expression should generally be interpreted in accordance with the meaning commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, or C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.).

[0064] Figure 1 A perspective view of a flow tube device according to an embodiment of the present disclosure is shown schematically; Figure 2 An exploded view of a flow tube device according to an embodiment of the present disclosure is shown schematically; Figure 3 A schematic cross-sectional view of a flow tube device according to an embodiment of the present disclosure is shown.

[0065] To address the aforementioned technical problems, this disclosure provides a flow tube device combining spray injection, such as... Figures 1 to 3 As shown, the flow tube device includes an inner tube 1, an outer tube 2, a first sealing joint 4, a second sealing joint 5, a tee joint 6, an air inlet pipe 7, and a liquid inlet pipe 9.

[0066] Figure 4 A perspective view of the inner tube of the flow tube device according to an embodiment of the present disclosure is shown schematically.

[0067] According to some embodiments of this disclosure, such as Figures 1-4 As shown, an outlet 101 is provided on the side of the inner tube 1, wherein the outlet 101 is used to collect reaction products.

[0068] Figure 5 A perspective view of the outer tube of the flow tube device according to an embodiment of the present disclosure is shown schematically.

[0069] According to some embodiments of this disclosure, such as Figures 1-3 and Figure 5As shown, the diameter of the outer tube 2 is larger than the diameter of the inner tube 1, and the outer tube 2 is fitted onto the inner tube 1. Optionally, the outer tube 2 and the inner tube 1 are coaxially arranged. Optionally, one end of the inner tube 1 extends beyond one end of the outer tube 2, and the other end of the inner tube 1 extends beyond the other end of the outer tube 2 or is flush with the other end of the outer tube 2.

[0070] Figure 6 A perspective view of the first sealing joint of the flow tube device according to an embodiment of the present disclosure is shown schematically.

[0071] According to some embodiments of this disclosure, such as Figures 1-3 and Figure 6 As shown, the first sealing joint 4 is disposed at both ends of the outer tube 2 and abuts against the outer side wall of the inner tube 1. The two first sealing joints 4 are used to define a sealed space between the inner tube 1 and the outer tube 2 to simulate the different gas pressure spaces required. Specifically, the first sealing joint 4 is fitted onto the inner tube 1 and seals the end of the outer tube 2.

[0072] Figure 7 A perspective view of the air inlet pipe and the liquid inlet pipe of the flow tube device according to an embodiment of the present disclosure is shown schematically.

[0073] According to some embodiments of this disclosure, such as Figures 1-3 and Figure 7 As shown, the outer diameter of the liquid inlet pipe 9 is smaller than the inner diameter of the air inlet pipe 7, and the outer diameter of the air inlet pipe 7 is smaller than the outer diameter of the inner pipe 1.

[0074] According to some embodiments of this disclosure, the intake pipe 7 is inserted into the interior of the inner tube 1 from a first end, with the other end exposed outside the inner tube 1. Optionally, the end of the intake pipe 7 inserted into the inner tube 1 is near the outlet 101.

[0075] Figure 8 A perspective view of the second sealing joint of the flow tube device according to an embodiment of the present disclosure is shown schematically.

[0076] According to some embodiments of this disclosure, such as Figures 1-3 and Figure 8 As shown, the second sealing joint 5 is sealed on the air inlet pipe 7 and is sealed to the first end of the inner pipe 1.

[0077] According to some embodiments of this disclosure, one end of the liquid inlet pipe 9 is inserted from the second end of the air inlet pipe 7, and the other end of the liquid inlet pipe 9 is used to connect to the liquid to be reacted.

[0078] Figure 9 A perspective view of a tee connector of a flow tube device according to an embodiment of the present disclosure is shown schematically.

[0079] According to some embodiments of this disclosure, such as Figures 1-3 and Figure 9As shown, the three-way connector 6 includes a first port 601, a second port 602, and a third port 603. The first port 601 is connected to and sealed to the second end of the air inlet pipe 7. The liquid inlet pipe 9 is inserted from the first port 601 and exits from the second port 602. The liquid inlet pipe 9 is sealed to the second port 602. The third port 603 is connected to the air inlet pipe 8, which is used to connect to the gas source to introduce gas.

[0080] According to some embodiments of this disclosure, one end of the liquid inlet pipe 9 is inserted into the mixed solution to be reacted, the gas inlet pipe 8 is introduced into the gas to be reacted, and the open end of the inner tube 1 is connected to a negative pressure device to draw the mixed solution to be reacted and the gas to be reacted into the inner tube 1 to participate in the reaction.

[0081] According to some embodiments of this disclosure, one end of the liquid inlet pipe 9 is inserted into the mixed solution to be reacted, and the mixed solution is pumped into the inner tube 1 by the liquid inlet pump. High-pressure gas is introduced through the gas inlet pipe 8 to atomize the mixed solution pumped into the inner tube 1 and participate in the reaction.

[0082] According to some embodiments of this disclosure, flow meters are also provided between the solution to be reacted and the second port 602, and between the third port 603 and the gas source, for accurately controlling the amount of mixed solution and gas introduced.

[0083] Figure 10 A perspective view of the collector of the flow tube device according to an embodiment of the present disclosure is shown schematically.

[0084] According to some embodiments of this disclosure, the flow tube device further includes a sampler 3. A sampling hole 201 is provided on the side wall of the outer tube 2. The sampling hole 201 is disposed opposite to the outlet 101. One end of the sampler 3 is inserted into the sampling hole 201 and communicates with the outlet 101. The other end of the sampler 3 is used to communicate with a negative pressure device, through which the reaction product at the outlet 101 is drawn into the sampler 3.

[0085] According to some embodiments of this disclosure, the sampler includes a tapered portion 301, a transition portion 302, and a connecting portion 303.

[0086] According to some embodiments of this disclosure, the tip of the tapered portion 301 is inserted into the sampling hole 201, and an opening is provided at the tip. The opening is abutted against or adjacent to the outlet 101, and the tapered portion 301 is sealed to the sampling hole 201.

[0087] According to some embodiments of this disclosure, one end of the transition portion 302 is connected to the tapered portion 301.

[0088] According to some embodiments of this disclosure, the connecting portion 302 is connected to the other end of the transition portion 302, and the connecting portion 302 is used to connect a negative pressure device.

[0089] According to some optional embodiments of this disclosure, the transition portion 302 is a hollow frustum shape, wherein the end with a smaller inner diameter is transitionally connected to the cone bottom of the conical portion 301, and the end with a larger inner diameter is transitionally connected to the connecting portion.

[0090] According to some embodiments of this disclosure, the diameter of the opening ranges from 50 to 150 μm. A diameter of 100 μm is particularly effective.

[0091] According to some embodiments of this disclosure, the flow tube device further includes a pressure gauge, wherein two vent holes 202 are provided on the side wall of the outer tube 2, and the two vent holes 202 are respectively used to connect the gas extraction device and the pressure gauge. By using the gas extraction / inflation device in conjunction with the vent holes 202, gas in the sealed space can be extracted / inflated to control the pressure of the sealed space between the inner tube 1 and the outer tube 2, so as to simulate the reaction environment under a specific pressure condition.

[0092] According to some embodiments of this disclosure, a recess 203 is provided on the outer side wall of one end of the outer tube 2, and an insertion hole is provided on the side wall of the recess 203 along the axial direction of the outer tube 2. The flow tube device also includes a thermocouple, which is inserted into the insertion hole along the axial direction of the outer tube, and the thermocouple is sealed to the insertion hole. The thermocouple is used to measure the reaction temperature inside the inner tube 1.

[0093] In this embodiment, optionally, the recess includes an oblique hole at one end of the outer tube 2. The oblique hole turns into a straight hole after entering the interior of the outer tube 2 and extends to the center of the outer quartz tube to facilitate the insertion of the thermocouple.

[0094] In this embodiment, the flow tube device needs to be placed in a high-temperature reactor during use. Optionally, the high-temperature reactor clamps the main body of the outer tube of the flow tube device for heating. The structure of the high-temperature reactor is understood by those skilled in the art and will not be described in detail here.

[0095] According to some embodiments of this disclosure, the inner wall of the outer tube 2 is provided with a strip groove along the axial direction. The strip groove is provided between the insertion hole and the sampling hole 201. The thermocouple is inserted into the strip groove, and one end of the thermocouple is close to the outlet on the inner tube.

[0096] According to some embodiments of this disclosure, the outer tube also includes transition tubes 10 at both ends. The transition tubes 10 include a constant diameter section and a variable diameter section. The constant diameter section is connected to the first sealing joint 4, and the two ends of the variable diameter section are respectively connected to the end of the outer tube 2 and the constant diameter section.

[0097] According to some embodiments of this disclosure, the outer tube 2 and the inner tube 1 are both quartz tubes; the air inlet tube 7 is a steel tube (stainless steel tube); and the liquid inlet tube 9 is a capillary tube.

[0098] According to some embodiments of this disclosure, the first sealing joint 4 includes a vacuum tube joint; and the second sealing joint 5 includes a reducing ferrule joint.

[0099] The present disclosure will be further described below with reference to specific embodiments. It should be understood that the specific embodiments are only for the purpose of enabling those skilled in the art to better understand the technical solutions of the present disclosure, and should not be construed as limiting the scope of protection of the present disclosure.

[0100] This disclosure provides a flow tube device combined with spray injection, including an 8mm quartz inner tube, a 10mm to 25mm quartz outer tube, a quartz nozzle (collector), a 10mm to 8mm Ultra-torr connector (vacuum tube connector), an 8mm to 6mm reducing ferrule connector, a 1 / 16-inch tee connector, a 1 / 16-inch stainless steel tube, a 6mm PFA tube, and a capillary tube.

[0101] An 8mm quartz inner tube passes through a 10mm to 25mm quartz outer tube, and the inner and outer quartz tubes are sealed by an Ultra-torr connector. The 8mm quartz inner tube has a 2mm hole on its side wall in the middle section for sampling by a quartz nozzle.

[0102] Two cylindrical holes are provided on both sides near the end of the 10mm to 25mm quartz outer tube for connecting a vacuum gauge or a pumping device. After sealing the inner and outer quartz tubes using an Ultra-torr connector, a vacuum pump can be connected to evacuate the space inside the outer and inner quartz tubes. The corresponding evacuation piping is understood by those skilled in the art and will not be described in detail here.

[0103] A cylindrical protrusion is provided on the outer wall of the quartz tube, which is 10mm to 25mm in diameter, for connection with a quartz nozzle.

[0104] The sampling device consists of a quartz nozzle with a small hole of about 100 μm at the tip. The other end of the nozzle is connected to a low vacuum chamber, and the sample is drawn into the chamber by the pressure difference.

[0105] According to the flow tube device of the above embodiments of the present disclosure, high-speed gas is introduced through the air inlet pipe to atomize the liquid in the liquid inlet pipe, and then the liquid participates in the reaction in the inner tube. This can effectively solve the defects caused by different vaporization temperatures of mixed liquids in related technologies. At the same time, with the help of a flow meter, the liquid can be accurately and quantitatively atomized and introduced into the inner tube to participate in the reaction.

[0106] The spray injection flow tube device provided in this disclosure has the following advantages:

[0107] 1. The spray injection flow tube device used in this disclosure has a simple structure and ingenious design. It is made up of multiple sets of quartz and stainless steel parts, and is easy to assemble and disassemble. It is particularly suitable for experimental needs of studying complex liquid components with different physicochemical properties.

[0108] 2. The flow tube device for spray injection disclosed herein can realize real-time monitoring of reaction temperature through an internal thermocouple, which is suitable for different reaction temperature requirements.

[0109] 3. This disclosure can achieve reactions under different pressure conditions by changing the background pressure through the quartz outer tube vacuum interface.

[0110] The embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. It should be noted that implementations not illustrated or described in the drawings or the main text of the specification are forms known to those skilled in the art and have not been described in detail. Furthermore, the definitions of the various components described above are not limited to the specific structures, shapes, or methods mentioned in the embodiments, and those skilled in the art can easily modify or substitute them.

[0111] It should also be noted that, in the specific embodiments of this disclosure, unless otherwise stated otherwise, the numerical parameters in this specification and the appended claims are approximate values ​​and can be changed according to the desired characteristics obtained from the content of this disclosure. Specifically, all numbers used in the specification and claims to indicate dimensions, range conditions, etc., of the composition should be understood to be modified by the term "about" in all cases. Generally, this means that there may be variations of ±10% in some embodiments, ±5% in some embodiments, ±1% in some embodiments, and ±0.5% in some embodiments.

[0112] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this disclosure. In particular, the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways without departing from the spirit and teachings of this disclosure. All such combinations and / or combinations fall within the scope of this disclosure.

[0113] The specific embodiments described above further illustrate the purpose, technical solutions, and beneficial effects of this disclosure. It should be understood that the above descriptions are merely specific embodiments of this disclosure and are not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A flow tube device combining spray injection, characterized in that, include: pressure gauge; The outer tube has a sampling hole and two vent holes on its side wall. The two vent holes are used to connect the air extraction device and the pressure gauge, respectively. An inner tube passes through the outer tube and extends beyond the ends of the outer tube at both ends. An outlet is provided on the side wall of the inner tube, and the outlet is positioned opposite to the sampling hole. A sampler, one end of which is inserted into the sampling hole and connected to the outlet, and the other end of which is used to connect to a negative pressure device; The first sealing joint is disposed at both ends of the outer tube and abuts against the inner tube, and is used to define a sealing space between the inner tube and the outer tube; An intake pipe is inserted from the first end of the inner tube; The second sealing joint is sleeved on the air intake pipe and sealed to the first end of the inner pipe; A liquid inlet pipe, one end of which is inserted into the second end of the air inlet pipe, and the other end of which is used to connect to the liquid to be reacted; and The three-way connector includes a first port, a second port, and a third port. The first port is connected to and sealed to the second end of the air inlet pipe. The liquid inlet pipe is inserted through the first port and exits through the second port. The liquid inlet pipe is sealed to the second port. The third port is used to connect to the gas to be introduced.

2. The flow tube device according to claim 1, characterized in that, The sampler includes: The tapered portion has its tip inserted into the sampling hole, and an opening is provided at the tip. The opening is abutted against or adjacent to the outlet, and the tapered portion is sealed to the sampling hole. The transition section, one end of which is connected to the tapered section; and The connecting part is connected to the other end of the transition part and is used to connect the negative pressure device.

3. The flow tube device according to claim 2, characterized in that, The diameter of the opening ranges from 50 to 150 μm.

4. The flow tube device according to claim 1, characterized in that, A recessed portion is provided on the outer side wall of one end of the outer tube, and an insertion hole is provided on the side wall of the recessed portion along the axial direction of the outer tube; and The flow tube device also includes a thermocouple, which is inserted into the socket along the axial direction of the outer tube, and the thermocouple is sealed to the socket.

5. The flow tube device according to claim 4, characterized in that, The inner wall of the outer tube is provided with a strip groove along the axial direction. The strip groove is located between the insertion hole and the sampling hole. The thermocouple is inserted into the strip groove, and one end of the thermocouple is close to the outlet on the inner tube.

6. The flow tube device according to claim 1, characterized in that, The two ends of the outer tube also include: The transition tube includes a constant diameter section and a variable diameter section. The constant diameter section is connected to the first sealing joint, and the two ends of the variable diameter section are respectively connected to the end of the outer tube and the constant diameter section.

7. The flow tube device according to claim 1, characterized in that, Both the outer tube and the inner tube are quartz tubes; The air intake pipe is a steel pipe; and The inlet tube is a capillary tube.

8. The flow tube device according to claim 1, characterized in that, The first sealing joint includes a vacuum tube connector; and The second sealing joint includes a reducing ferrule coupling.

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