CN220060901U - Joint assembly of sample tube and specific surface area instrument - Google Patents

Abstract

The utility model discloses a joint component of a sample tube and a specific surface area instrument, wherein the joint component of the sample tube comprises: the joint component is used for connecting sample cell and outlet duct subassembly in the installation piece of specific surface area instrument, and the joint component includes: the mounting joint is suitable for being connected with the mounting block, an inserting cavity is formed in the mounting joint, the air outlet pipe component is arranged in the mounting joint in a penetrating mode, and the sample pipe is inserted into the inserting cavity and sleeved outside the air outlet pipe component; the elastic sealing piece is sleeved outside the sample tube; the movable structure is movably connected to the mounting joint and is suitable for pushing the elastic sealing piece to compress the sample tube when moving relative to the mounting joint. The connector assembly of the sample tube is easy to disassemble and assemble, has good sealing performance, and ensures that gas in the sample tube and the gas outlet tube assembly cannot leak.

Description

Joint assembly of sample tube and specific surface area instrument

Technical Field

The utility model relates to the technical field of material detection, in particular to a joint component of a sample tube and a specific surface area instrument.

Background

The principle of measuring specific surface area by gas adsorption method is that according to the adsorption characteristic of gas on solid surface, under a certain pressure, the surface of the tested sample particle has reversible physical adsorption action on gas molecule at ultralow temperature, and the equilibrium adsorption quantity is determined corresponding to a certain pressure, and the specific surface area of the tested sample is equivalently obtained by measuring the equilibrium adsorption quantity and utilizing a theoretical model.

When the specific surface area of a sample is measured in the gas adsorption industry, the sample to be measured is required to be filled by using a quartz glass sample tube, the quartz glass sample tube is required to be fixedly arranged on a metal part of equipment by using a connector, and the quartz glass tube is taken down after the sample to be measured is finished; however, the joint structure of the prior art is inconvenient to assemble and disassemble or has poor sealing performance.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present utility model is to provide a connector assembly of a sample tube, which is easy to be assembled and disassembled, has good sealing performance, and ensures that gas in the sample tube and the gas outlet tube assembly cannot leak.

According to an embodiment of the present utility model, a joint assembly for connecting a sample tube and an outlet tube assembly to a mounting block of a specific surface area instrument, the joint assembly comprising: the mounting joint is suitable for being connected with the mounting block, a plug-in cavity is formed in the mounting joint, the air outlet pipe component penetrates through the mounting joint, and the sample pipe is plugged into the plug-in cavity and sleeved outside the air outlet pipe component; the elastic sealing piece is sleeved outside the sample tube; and the movable structure is movably connected with the mounting joint and is suitable for pushing the elastic sealing piece to press the sample tube when moving relative to the mounting joint.

According to the connector assembly of the sample tube, the plug-in cavity is formed in the mounting connector, the plug-in cavity can be used for conveniently mounting the air outlet pipe assembly and the sample tube, in addition, leakage of air can be prevented after the plug-in cavity is sealed, meanwhile, the elastic sealing piece can seal a gap between the sample tube and the inner wall of the mounting connector when the movable structure moves, tightness of air entering the sample tube and tightness of air outlet through the air outlet pipe assembly are guaranteed, one end of the mounting connector is connected with the mounting block, the other end of the mounting connector is connected with the movable structure and the elastic sealing piece, and the whole assembly and disassembly are convenient.

According to the joint assembly of the sample tube, the movable structure comprises the first clamping sleeve joint and the second clamping sleeve joint, the first clamping sleeve joint and the second clamping sleeve joint are sleeved outside the sample tube, the second clamping sleeve joint is located between the first clamping sleeve joint and the elastic sealing piece, the first clamping sleeve joint is in threaded connection with the mounting joint, and the first clamping sleeve joint pushes the second clamping sleeve joint to compress the elastic sealing piece when being screwed relative to the mounting joint.

According to the joint assembly of the sample tube, the first clamping sleeve joint comprises the sleeve part and the pressing part, the sleeve part is sleeved outside the part of the installation joint and is in threaded connection with the installation joint, and the pressing part is connected to one end of the sleeve part and is pressed against one end of the second clamping sleeve joint, which is away from the elastic sealing piece.

According to the joint assembly of the sample tube, provided by the embodiment of the utility model, the limiting clamping sleeve joint is arranged outside the mounting joint, and the sleeve part is limited and pressed against the limiting clamping sleeve joint when the sleeve part is screwed to the extreme limit relative to the mounting joint.

According to the joint assembly of the sample tube, the limiting clamping sleeve joint is movably arranged on the installation joint, and the position of the limiting clamping sleeve joint in the axial direction of the installation joint is adjustable.

According to the joint component of the sample tube, the inner peripheral wall of one end, away from the mounting block, of the plug-in cavity is provided with the embedded groove, the embedded groove is internally provided with the annular pressing piece, the pressing piece is sleeved outside the sample tube, and the elastic sealing piece is positioned between the pressing piece and the second clamping sleeve joint.

According to the joint component of the sample tube, the movable limiting piece is arranged in the inserting cavity, and the limiting piece is sleeved outside the air outlet pipe component and used for radially limiting the air outlet pipe component.

According to the joint assembly of the sample tube, the gas outlet tube assembly comprises a first gas outlet tube and a second gas outlet tube, the outer diameter of the first gas outlet tube is smaller than that of the second gas outlet tube, the first gas outlet tube penetrates through the mounting joint and extends into the mounting block, the limiting piece is sleeved outside the first gas outlet tube, the second gas outlet tube extends into the sample tube, and the second gas outlet tube is connected with the first gas outlet tube.

According to the joint component of the sample tube, one end of the second air outlet tube, which is positioned in the inserting cavity, extends out of the sample tube and is provided with the connecting groove, the end part of the first air outlet tube extends into the connecting groove, and a sealing piece is arranged between the first air outlet tube and the inner peripheral wall of the connecting groove.

The embodiment of the utility model also discloses a specific surface area instrument which comprises the joint component of the sample tube.

The specific surface area instrument and the connector assembly have the same advantages over the prior art and are not described in detail herein.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is an elevation view of a joint assembly of a sample tube according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view in the direction A-A of FIG. 1 of a sample tube according to an embodiment of the present utility model;

FIG. 3 is an enlarged view of the sample tube of FIG. 2 at B in accordance with an embodiment of the present utility model;

fig. 4 is a schematic perspective view of a sample tube according to an embodiment of the present utility model.

Reference numerals:

the connector assembly 100 is configured such that,

the mounting block 1, the air inlet 11, the air outlet 12,

the sample vessel 2 is provided with a sample tube,

the mounting tabs 3, the limit projections 31,

the first ferrule fitting 4, the sleeve portion 41, the abutment portion 42,

the outlet pipe assembly 5, the first outlet pipe 51, the second outlet pipe 52, the connecting groove 521, the sealing member 522,

the second clamping sleeve joint 6, the limiting piece 7, the limiting clamping sleeve joint 8, the elastic sealing piece 9 and the pressing piece 10.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

The joint assembly 100 of the sample tube 2 according to the embodiment of the present utility model is described below with reference to fig. 1 to 4, and is easy to assemble and disassemble, and has good sealing properties, ensuring that the gas in the sample tube 2 and the gas outlet tube assembly 5 does not leak.

As shown in fig. 1 to 4, a joint assembly 100 of a sample tube 2 according to an embodiment of the present utility model, the joint assembly 100 for connecting the sample tube 2 and an outlet tube assembly 5 to a mounting block 1 of a specific surface area instrument, the joint assembly 100 comprising: the mounting nipple 3, the elastic seal 9 and the movable structure.

Wherein, the installation joint 3 is suitable for being connected with the installation block 1, and the specific installation joint 3 can be detachably connected with the installation block 1, such as threaded connection, when in use, the installation joint 3 can be installed on the installation block 1, and then the air outlet pipe component 5 and the sample pipe 2 are connected with the installation joint 3 and the installation block 1.

Moreover, an inserting cavity is formed in the mounting joint 3, the air outlet pipe component 5 is arranged in the mounting joint 3 in a penetrating way, the sample tube 2 is inserted into the inserting cavity and sleeved outside the air outlet pipe component 5, so that the sample tube 2 is communicated with the inserting cavity and the mounting block 1, and when air is fed through the mounting block 1, the air can enter the inserting cavity and continuously enter the sample tube 2; meanwhile, the sample tube 2 is sleeved outside the air outlet tube component 5, and then the air outlet tube component 5 can be communicated to the mounting block 1.

Specifically, the grafting chamber can be through the installation joint 3 intercommunication to the outer inlet end of installation piece 1 with give vent to anger the end for gas gets into the grafting intracavity of installation joint 3 through installation piece 1, thereby get into in the sample cell 2 and with the gaseous reaction in the sample cell 2, and when giving vent to anger, flow out through the outlet duct subassembly 5 in the sample cell 2, can make sample cell 2 and outlet duct subassembly 5 be convenient for be connected with installation piece 1 through setting up installation joint 3, make the inlet and the outlet of sample cell 2 and outlet duct subassembly 5 convenient.

In addition, the elastic sealing element 9 is sleeved outside the sample tube 2, the movable structure is movably connected to the mounting joint 3, and the movable structure is suitable for pushing the elastic sealing element 9 to compress the sample tube 2 when moving relative to the mounting joint 3, so before the sample tube 2 is mounted with the mounting joint 3, the elastic sealing element 9 and the movable structure are sleeved outside the sample tube 2, the elastic sealing element 9 of the sample tube 2 is extruded through the movable structure, the elastic sealing element 9 seals the outer part of the sample tube 2, the tightness of the mounting joint 3 and the outer part of the sample tube 2 is ensured, and gas leakage from the splicing cavity is prevented.

Therefore, the elastic sealing piece 9 of the joint assembly 100 of the sample tube 2 can seal the gap between the sample tube 2 and the inner wall of the installation joint 3 when the movable structure moves, so that the tightness of gas entering the sample tube 2 and the tightness of gas out of the gas outlet pipe assembly 5 are ensured, one end of the installation joint 3 is connected with the installation block 1, the other end is connected with the movable structure and the elastic sealing piece 9 and is connected with the sample tube 2, and the gas outlet pipe assembly 5 penetrates through the installation joint 3, so that the whole assembly and disassembly are convenient.

In some embodiments, the movable structure comprises a first ferrule fitting 4 and a second ferrule fitting 6, the first ferrule fitting 4 and the second ferrule fitting 6 are both sleeved outside the sample tube 2, the second ferrule fitting 6 is located between the first ferrule fitting 4 and the elastic seal 9, and the first ferrule fitting 4 urges the second ferrule fitting 6 to compress the elastic seal 9 when screwed against the mounting fitting 3.

In practice, before the sample tube 2 is connected with the mounting connector 3, first the first cutting ferrule connector 4, the second cutting ferrule connector 6 and the elastic sealing element 9 are sleeved outside one end of the sample tube 2 extending into the inserting cavity, the elastic sealing element 9 is in contact with the outside of the sample tube 2, and the elastic sealing element 9 can be extruded under the action of external force, so that deformation is generated, the outside of the sample tube 2 is sealed with a gap of the mounting connector 3, tightness of gas entering the sample tube 2 is guaranteed, leakage of gas discharged by the gas outlet pipe assembly 5 positioned inside the sample tube 2 is also guaranteed, and the gas flows to the mounting block 1 and flows out according to a given path.

Specifically, first cutting ferrule connects 4 and installation joint 3 threaded connection, then first cutting ferrule connects 4 and connects 3 processes that pass through the screw thread with the installation and screw, just be the extrusion of elastic sealing spare 9 through first cutting ferrule connects 4 and installation joint 3 threaded connection, realize that first cutting ferrule connects 4 and installation joint 3's can dismantle the connection, also can adjust the degree that first cutting ferrule connects 4 extrusion of elastic sealing spare 9 through adjusting the screw thread degree of screwing of first cutting ferrule and connecting 4 and installation joint 3 simultaneously for elastic sealing spare 9 produces the deformation at the in-process that first cutting ferrule connects 4 activity and produces the extrusion, and then guarantees the sealed effect of elastic sealing spare 9.

In some embodiments, the first ferrule joint 4 comprises a sleeve portion 41 and a pressing portion 42, the sleeve portion 41 is sleeved outside a portion of the mounting joint 3 and is in threaded connection with the mounting joint 3, and the pressing portion 42 is connected to one end of the sleeve portion 41 and presses against one end of the second ferrule joint 6 facing away from the elastic sealing member 9.

Referring to fig. 3, after the first ferrule connector 4 is sleeved outside the sample tube 2, the sleeve portion 41 is in threaded connection with the outer wall of one end of the mounting connector 3 away from the mounting block 1, at this time, the pressing portion 42 and the sleeve portion 41 may be integrated, the pressing portion 42 presses the second ferrule connector 6, the second ferrule connector 6 directly presses the elastic sealing member 9, and the second ferrule connector 6 may move along the axial direction of the mounting connector 3, when the sleeve portion 41 of the first ferrule connector 4 is screwed with the outer thread of the mounting connector 3, the pressing portion 42 directly presses the second ferrule connector 6, so that the second ferrule connector 6 moves along the axial direction of the mounting connector 3, the process of moving the second ferrule connector 6 along the axial direction of the mounting connector 3 is the process of extruding the elastic sealing member 9, at this time, the portion of the sample tube 2 extending into the plug cavity is sealed in the plug cavity by the elastic sealing member 9, so as to prevent the sample tube 2 from leaking.

In some embodiments, the mounting joint 3 is externally provided with a limiting ferrule joint 8, and the sleeve portion 41 is limited against the limiting ferrule joint 8 when screwed to a limit position relative to the mounting joint 3.

In practice, the installation joint 3 includes the first part of installing in installation piece 1 inside, still including exposing in the second part outside installation piece 1, wherein the external diameter of first part is less than the external diameter of second part, and the second part is close to installation piece 1 department and is equipped with along the radial spacing protruding 31 of extension of installation joint 3, and spacing cutting ferrule joint 8 cover is established at installation joint 3, and be located spacing protruding 31 and deviate from one side of installation piece 1, spacing protruding 31 both can carry out spacingly to spacing cutting ferrule joint 8 be close to one side of installation piece 1, still can carry out spacingly to the first part that installation joint 3 is located installation piece 1, also can guarantee the leakproofness that installation piece 1 and installation joint 3 are connected simultaneously.

In addition, when the first clamping sleeve connector 4 is screwed with the mounting connector 3 in a threaded manner and the elastic sealing element 9 is extruded, the axial moving position of the first clamping sleeve connector 4 towards one side of the mounting block 1 can be limited through the limiting clamping sleeve connector 8, so that the compression amount of the elastic sealing element 9 is consistent every time, and the sealing accuracy and reliability are improved.

In some embodiments, the limit ferrule connector 8 is movably mounted to the mounting connector 3, and the position of the limit ferrule connector 8 in the axial direction of the mounting connector 3 is adjustable.

In practice, the spacing cutting ferrule connects 8 and the outer wall movable threaded connection of installation joint 3, and spacing cutting ferrule connects 8 can adjust the axial position that is located installation joint 3, when spacing cutting ferrule connects 8 and foretell spacing protruding 31 top tightly, spacing cutting ferrule connects 8 this moment can make the movable structure along the axial extruded distance of installation joint 3 longest, and when spacing cutting ferrule connects 8 more to the movable structure, spacing cutting ferrule connects 8 this moment can make the movable structure along the axial extruded distance of installation joint 3 shorter, through adjusting the height that spacing cutting ferrule connects 8, can make the extrusion effect of movable structure extrusion elastic seal 9 different.

Then, when the extrusion effect of the elastic sealing element 9 is required to be the same each time, the limiting clamping sleeve joint 8 can be arranged at the same position, and the movable structure is limited, so that the uniformity of the compression amount of the elastic sealing element 9 each time can be ensured, and the sealing accuracy is improved.

In some embodiments, the inner peripheral wall of the plug cavity at one end facing away from the mounting block 1 is provided with an embedded groove, an annular pressing piece 10 is arranged in the embedded groove, the pressing piece 10 is sleeved outside the sample tube 2, and the elastic sealing piece 9 is positioned between the pressing piece 10 and the second clamping sleeve joint 6.

In practice, the elastic sealing element 9 and the pressing element 10 may be disposed along the axial direction of the mounting joint 3, and the pressing element 10 is closer to one side of the mounting block 1, the second ferrule joint 6 is located at one end of the mounting joint 3 away from the mounting block 1, during actual connection, the first ferrule joint 4 is sleeved outside the sample tube 2, and then the pressing element 10, the elastic sealing element 9 and the second ferrule joint 6 are sequentially sleeved outside the sample tube 2, where the second ferrule joint 6 is supported on the pressing portion 42 of the first ferrule joint 4, the elastic sealing element 9 is located on the first ferrule joint 4, the pressing element 10 is located on the elastic sealing element 9, when the first ferrule joint 4 is rotated, the sleeve portion 41 of the first ferrule joint 4 is in threaded connection with the outer wall of the mounting joint 3, the pressing portion 42 of the first ferrule joint 4 presses the second ferrule joint 6, and the pressing element 10 presses against the inner groove of the mounting joint 3 and presses against the mounting joint 3.

According to the embodiment of the utility model, the sleeve part 41 of the first clamping sleeve connector 4 is rotated, so that the pressing part 42 of the first clamping sleeve connector 4 presses the second clamping sleeve connector 6, the second clamping sleeve connector 6 further presses the elastic sealing element 9, the pressing element 10 presses the embedded groove of the mounting connector 3, the elastic sealing element 9 is compressed between the second clamping sleeve connector 6 and the pressing element 10, and further, the part of the sealed sample tube 2 extending into the inserting cavity is sealed in the inserting cavity, so that gas leakage is prevented.

In some embodiments, a movable limiting piece 7 is arranged in the plugging cavity, and the limiting piece 7 is sleeved outside the air outlet pipe assembly 5 and used for radially limiting the air outlet pipe assembly 5.

Specifically, the locating part 7 cover is established outside outlet duct subassembly 5, carries out thick spacing to outlet duct subassembly 5, in addition, threaded connection between locating part 7 and the inner wall of installation joint 3, and can be in the installation joint 3 in axial adjustment position, can make the height that sample cell 2 stretched into the grafting intracavity remove according to actual conditions then.

In some embodiments, the air outlet pipe assembly 5 includes a first air outlet pipe 51 and a second air outlet pipe 52, the outer diameter of the first air outlet pipe 51 is smaller than the outer diameter of the second air outlet pipe 52, the first air outlet pipe 51 is arranged through the mounting joint 3 and extends into the mounting block 1, the limiting piece 7 is sleeved outside the first air outlet pipe 51, the second air outlet pipe 52 extends into the sample tube 2, and the second air outlet pipe 52 is connected with the first air outlet pipe 51.

Specifically, the outer diameter of the first air outlet pipe 51 is smaller than the outer diameter of the second air outlet pipe 52, so that one end of the first air outlet pipe 51 extends into the second air outlet pipe 52 to be connected with the first air outlet pipe 51, the first air outlet pipe 51 extends into the mounting block 1, the second air outlet pipe 52 is communicated with the first air outlet pipe 51, the second air outlet pipe 52 is communicated into the mounting block 1 through the first air outlet pipe 51, meanwhile, the second air outlet pipe 52 extends into the sample tube 2, and then the gas after the reaction in the sample tube 2 flows to the mounting block 1 through the second air outlet pipe 52 and the first air outlet pipe 51, and then flows out through the air outlet 12 of the mounting block 1.

In addition, when air is taken in, air is taken in through the air inlet 11 of the mounting block 1, flows to the gap between the inner wall of the limiting piece 7 and the outer wall of the first air outlet pipe 51 through the gap between the first air outlet pipe 51 and the inner wall of the mounting joint 3, then flows into the plug-in cavity, continuously flows into the sample pipe 2 through the gap between the outer wall of the second air outlet pipe 52 and the inner wall of the sample pipe 2 in the plug-in cavity, reacts with the sample of the sample pipe 2, and the reacted air flows out of the mounting block 1 through the second air outlet pipe 52 and the first air outlet pipe 51.

According to the embodiment of the utility model, the first air outlet pipe 51 and the second air outlet pipe 52 are designed, so that the air outlet and the air inlet are separated, the air inlet reaction and the exhaust after the reaction are convenient, in practice, the first air outlet pipe 51 can be arranged as a metal capillary, the second air outlet pipe 52 and the sample pipe 2 can be quartz glass air outlet pipes, the connection of the first air outlet pipe 51 and the second air outlet pipe 52 is convenient, and meanwhile, the quartz glass is high in temperature resistance and high in heat balance speed, and is not easy to react with other chemical reagents.

In some embodiments, an end of the second air outlet pipe 52 located in the plugging cavity extends out of the sample tube 2 and is provided with a connecting groove 521, an end of the first air outlet pipe 51 extends into the connecting groove 521, and a sealing member 522 is provided between the first air outlet pipe 51 and an inner peripheral wall of the connecting groove 521.

Referring to fig. 3, in practice, the wall thickness of the second air outlet pipe 52 is greater than the wall thickness of the first air outlet pipe 51, then a connecting groove 521 is provided at one end of the second air outlet pipe 52 connected with the first air outlet pipe 51, the first air outlet pipe 51 extends into the connecting groove 521, and a sealing member 522 is sleeved between the outer wall of the first air outlet pipe 51 and the inner wall of the connecting groove 521, so that no air leakage occurs at the connection part of the first air outlet pipe 51 and the second air outlet pipe 52 through the sealing member 522.

It should be noted that, a gap may be left between the upper end of the sealing member 522 and the bottom of the limiting member 7, so that air can smoothly enter the plugging cavity through the gap between the inner wall of the limiting member 7 and the outer wall of the first air outlet pipe 51, and then enter the gap between the inner wall of the sample tube 2 and the outer wall of the second air outlet pipe 52 to react with the objects inside the sample tube 2.

The embodiment of the utility model also discloses a specific surface area instrument, which comprises the connector assembly 100 of the sample tube 2, and the sample tube 2 and the air outlet tube assembly 5 can be connected with the mounting block 1, so that the air inlet and the air outlet are convenient, the disassembly and the assembly are easy, the tightness is good, and the air in the tube is ensured not to leak. In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

In the description of the utility model, a "first feature" or "second feature" may include one or more of such features.

In the description of the present utility model, "plurality" means two or more.

In the description of the utility model, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween.

In the description of the utility model, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A connector assembly for a sample tube for connecting the sample tube and outlet tube assembly to a mounting block of a specific surface area instrument, the connector assembly comprising:

the mounting joint is suitable for being connected with the mounting block, a plug-in cavity is formed in the mounting joint, the air outlet pipe component penetrates through the mounting joint, and the sample pipe is plugged into the plug-in cavity and sleeved outside the air outlet pipe component;

the elastic sealing piece is sleeved outside the sample tube;

and the movable structure is movably connected with the mounting joint and is suitable for pushing the elastic sealing piece to press the sample tube when moving relative to the mounting joint.

2. The connector assembly of a sample tube of claim 1, wherein the movable structure comprises a first ferrule connector and a second ferrule connector, the first ferrule connector and the second ferrule connector are both sleeved outside the sample tube, the second ferrule connector is positioned between the first ferrule connector and the elastic sealing member, the first ferrule connector is in threaded connection with the mounting connector, and the first ferrule connector pushes the second ferrule connector to compress the elastic sealing member when screwed relative to the mounting connector.

3. The connector assembly of the sample tube according to claim 2, wherein the first ferrule connector comprises a sleeve portion and a pressing portion, the sleeve portion is sleeved outside the portion of the mounting connector and is in threaded connection with the mounting connector, and the pressing portion is connected to one end of the sleeve portion and presses against one end of the second ferrule connector, which is away from the elastic sealing element.

4. A sample tube connector assembly according to claim 3, wherein the mounting connector is provided with a limiting ferrule connector, and the sleeve portion is limited against the limiting ferrule connector when screwed to a limit position relative to the mounting connector.

5. The connector assembly of the sample tube according to claim 4, wherein the limit grip connector is movably mounted to the mounting connector, and the position of the limit grip connector in the axial direction of the mounting connector is adjustable.

6. The connector assembly of a sample tube according to claim 2, wherein the insertion cavity is provided with an embedded groove in an inner peripheral wall of one end facing away from the mounting block, an annular pressing piece is arranged in the embedded groove, the pressing piece is sleeved outside the sample tube, and the elastic sealing piece is located between the pressing piece and the second clamping sleeve connector.

7. The connector assembly of the sample tube according to claim 1, wherein a movable limiting piece is arranged in the insertion cavity, and the limiting piece is sleeved outside the air outlet pipe assembly and used for radially limiting the air outlet pipe assembly.

8. The connector assembly of the sample tube according to claim 7, wherein the air outlet tube assembly comprises a first air outlet tube and a second air outlet tube, the outer diameter of the first air outlet tube is smaller than the outer diameter of the second air outlet tube, the first air outlet tube is arranged in the mounting connector in a penetrating manner and extends into the mounting block, the limiting piece is sleeved outside the first air outlet tube, the second air outlet tube extends into the sample tube, and the second air outlet tube is connected with the first air outlet tube.

9. The connector assembly of the sample tube according to claim 8, wherein one end of the second air outlet tube located in the insertion cavity extends out of the sample tube and is provided with a connecting groove, the end of the first air outlet tube extends into the connecting groove, and a sealing element is arranged between the first air outlet tube and the inner peripheral wall of the connecting groove.

10. A specific surface area instrument comprising the joint assembly of the sample tube of any one of claims 1-9.