Physical adsorption instrument and sample pipe joint thereof

Abstract

The utility model relates to a physical adsorption instrument and a sample pipe joint thereof. The sample pipe joint of the physical adsorption instrument comprises a connecting shell, a first sealing ring and a piston, a first opening, a second opening and a third opening are formed in the side wall of the connecting shell, a first sealing ring is arranged on the inner wall of the end, provided with the first opening, of the connecting shell, the first opening faces a sample connector of the physical adsorption instrument, the second opening deviates from the sample connector of the physical adsorption instrument, and the third opening is suitable for being communicated with the output end of a gas source supply device; the piston is located in the connecting shell and slidably connected with the connecting shell, the piston and the first sealing ring are oppositely arranged, and the third opening and the first sealing ring are located at the two ends of the piston in the sliding direction respectively. A through hole is formed in the piston and penetrates through the two ends of the piston in the sliding direction, and the first opening, the first sealing ring, the through hole and the second opening are sequentially and oppositely arranged and matched with the sample tube. Compared with an existing physical adsorption instrument and a pipe joint thereof, the connection airtightness of the sample pipe and the physical adsorption instrument can be guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of physical adsorption instruments, and in particular to a physical adsorption instrument and a sample pipe joint thereof. Background Art

[0002] A physical adsorption instrument is an instrument for analyzing and measuring the specific surface area of ​​sample materials. Based on the characteristics of physical adsorption, the physical adsorption instrument first degasses the sample to be tested, and then uses gas molecules (with known molecular cross-sectional areas) as probes to cover the entire surface of the sample to be tested for adsorption. The specific surface area of ​​the sample is calculated by the amount of adsorbed gas. Therefore, the airtightness of the connection between the sample tube and the adsorption instrument interface is very critical.

[0003] In addition, as an analytical measuring instrument, the physical adsorption instrument needs to frequently load and unload sample tubes to measure various sample materials. However, in the existing physical adsorption instrument, in order to facilitate loading and unloading, the sample tube is only plugged into the joint, and there is a gap between the sample tube and the inner wall of the joint, which makes it difficult to ensure the airtightness of the connection between the sample tube and the joint, which has an adverse effect on the measurement accuracy of the instrument, such as patent document CN218326174U.

[0004] Therefore, how to ensure the airtightness of the connection between the sample tube and the physical adsorption instrument has become an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] In order to ensure the air tightness of the connection between the sample tube and the physical adsorption instrument, the present application provides a physical adsorption instrument and a sample tube joint thereof.

[0006] A physical adsorption instrument sample pipe joint provided to achieve the purpose of the utility model comprises:

[0007] Connecting the housing, the first sealing ring and the piston;

[0008] The side wall of the connection shell is provided with a first opening, a second opening and a third opening, and the inner wall of one end of the connection shell provided with the first opening is provided with a first sealing ring, the first opening faces the sample interface of the physical adsorption instrument, the second opening faces away from the sample interface of the physical adsorption instrument, and the third opening is suitable for communicating with the output end of the gas source supply device;

[0009] The piston is located in the connecting shell, the piston is slidably connected to the connecting shell, the piston is arranged opposite to the first sealing ring, and the third opening and the first sealing ring are respectively located at two ends of the sliding direction of the piston;

[0010] The piston is provided with a through hole, and the through hole runs through both ends of the piston in the sliding direction. The first opening, the first sealing ring, the through hole and the second opening are arranged opposite to each other in sequence and match the sample tube.

[0011] According to another aspect of the present application, a physical adsorption instrument is provided, wherein the physical adsorption instrument is provided with the aforementioned physical adsorption instrument sample tube connector.

[0012] Compared with the existing physical adsorption instrument, in order to facilitate loading and unloading, the sample tube is only inserted into the joint, and there is a gap between the sample tube and the inner wall of the joint, which makes it difficult to ensure the air tightness of the connection between the sample tube and the joint. The present application can squeeze the first sealing ring between the sample tube and the gap between the inner wall of the tube joint by a sliding piston, so that it elastically deforms to fill the gap between the two, thereby ensuring the air tightness of the sample tube and the adsorption instrument in the connected state and improving the measurement accuracy of the adsorption instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram showing the structure of the sample tube connector of the physical adsorption instrument according to the embodiment of the present application when the sample tube and the adsorption instrument are connected;

[0014] Figure 2 Show Figure 1 A partial enlarged view of

[0015] Figure 3 Show Figure 1 A schematic structural diagram of the embodiment, showing the positional relationship of the various components when the piston is moved downward to remove the seal and the sample tube is about to be removed from the pipe joint of the adsorption instrument;

[0016] Figure 4 Show Figure 3 A partial enlarged view of

[0017] Figure 5 A schematic diagram showing the structure of a second connecting member in an embodiment of the present application;

[0018] Figure 6 A schematic structural diagram showing a first connecting member according to an embodiment of the present application;

[0019] Figure 7 A schematic diagram showing the structure of a piston in an embodiment of the present application;

[0020] Figure 8 A schematic structural diagram of a sample adsorption instrument according to an embodiment of the present application is shown.

[0021] Sample tube 100, connecting shell 200, first connecting piece 210, sliding cavity 211, second connecting piece 220, second sliding groove 221, piston limiting portion 222, notch 223, first opening 230, second opening 240, third opening 250, sealing limiting portion 260, fourth sealing ring 270, piston 300, piston sliding groove 310, second sealing ring 320, third sealing ring 330, first sealing ring 400, physical adsorption instrument 500, physical adsorption instrument sample tube connector 510. DETAILED DESCRIPTION

[0022] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0023] Among them, it should be understood that the directions or positional relationships indicated by terms such as "length", "width", "height", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0024] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0025] According to one aspect of the present application, a physical adsorption instrument sample tube connector 510 with good airtightness and easy loading and unloading is provided, including a connecting shell 200, a first sealing ring 400 and a piston 300. The connecting shell 200 is located and fixed at the sample interface of the physical adsorption instrument, and serves as the sample interface of the physical adsorption instrument, connecting the sample tube 100 with the internal chamber of the physical adsorption instrument to complete operations such as degassing and adsorption of the sample. The side wall of the connecting shell 200 is provided with a first opening 230, a second opening 240 and a third opening 250, and a first sealing ring 400 is provided on the inner wall of one end of the connecting shell 200 provided with the first opening 230. The axial end of the first sealing ring 400 close to the first opening 230 is fixed to the inner wall of the connecting shell 200, and only elastic deformation occurs to lock and seal / relax and release the sample tube 100, and no radial and axial displacement occurs. The first opening 230 faces the sample interface of the physical adsorption instrument, the second opening 240 faces away from the sample interface of the physical adsorption instrument, and the third opening 250 is suitable for connecting with the output end of the gas source supply device; the piston 300 is located in the connecting shell 200, the piston 300 is slidably connected to the connecting shell 200, the piston 300 and the first sealing ring 400 are arranged opposite to each other, and the third opening 250 and the first sealing ring 400 are respectively located at the two ends of the sliding direction of the piston 300; the piston 300 is provided with a through hole, and the through hole runs through the two ends of the sliding direction of the piston 300, and the first opening 230, the first sealing ring 400, the through hole and the second opening 240 are arranged opposite to each other in sequence and match the sample tube 100.

[0026] It should be noted that "the third opening 250 and the first sealing ring 400 are respectively located at the two ends of the sliding direction of the piston 300" means: the third opening 250 and the first sealing ring 400 are respectively located at the two ends of the linear sliding limit value of the piston 300, and the gas source supply device supplies gas to the connection shell 200 through the third opening 250. Under the impetus of the airflow, the piston 300 slides and moves toward the end where the first sealing ring 400 is located until it abuts and presses the first sealing ring 400, so that the first sealing ring 400 is elastically deformed under force, and the sample tube 100 is locked to ensure the airtightness during the analysis and testing process and the accuracy of the side-viewing results. The air can be evacuated through the third opening 250, and the piston 300 is no longer supported by the airflow, and naturally slides down away from the first sealing ring 400. The first sealing ring 400 is no longer under force and naturally relaxes, and the sample tube 100 can be removed.

[0027] The specific steps of loading the sample to be detected and analyzed into the physical adsorption instrument 500 are as follows: load the sample to be detected and analyzed into the sample tube 100 with one end open, and the open end of the sample tube 100 passes through the second opening 240, the perforation, the first sealing ring 400 and the second opening 240 in sequence, and then extends into the sample interface of the physical adsorption instrument, and is connected with the chamber of the physical adsorption instrument to achieve degassing and adsorption of the sample, thereby completing the detection and analysis of the sample.

[0028] After the detection and analysis is completed / when it is necessary to change to another sample for detection, the sample tube 100 needs to be disassembled. The specific steps are: remove the air supply of the third opening 250 and exhaust the air. An integrated air source device for suction and delivery can be connected to the third opening 250, or the air source supply device at the third opening 250 can be removed, and the natural sliding of the piston 300 (under the action of gravity) can be used for exhaust. An exhaust hole can also be opened in the connecting pipe between the air source supply device and the third opening 250, and a matching detachable plug can be provided for the exhaust hole. As long as the supporting effect of the airflow on the piston 300 can be released and the piston 300 can be made to slide away from the first sealing ring 400, the first sealing ring 400 can be loosened and unlocked, so that the sample tube 100 can be easily removed from the joint of the sample tube 100.

[0029] Compared with the existing physical adsorption instrument, in order to facilitate loading and unloading, the sample tube is only inserted into the joint, and there is a gap between the sample tube and the inner wall of the joint, which makes it difficult to ensure the air tightness of the connection between the sample tube and the joint. The present application can squeeze the first sealing ring between the sample tube and the gap between the inner wall of the tube joint by a sliding piston, so that it elastically deforms to fill the gap between the two, thereby ensuring the air tightness of the sample tube and the adsorption instrument in the connected state and improving the measurement accuracy of the adsorption instrument.

[0030] In one possible implementation, the connecting shell 200 includes a first connecting member 210 and a second connecting member 220, the first opening 230 and the first sealing ring 400 are located on the first connecting member 210, and the end of the first connecting member 210 away from the first opening 230 is provided with a sliding cavity 211 matching the piston 300, the piston 300 is located in the sliding cavity 211, the piston 300 is slidingly connected to the first connecting member 210, the second opening 240 is located on the second connecting member 220, the third opening 250 is located on the first connecting member 210 or the second connecting member 220, and the end of the first connecting member 210 away from the first opening 230 and the second connecting member 220 are detachably connected. The present application realizes the detachable separation of the components of the connection shell 200 by setting the first connection member 210 and the second connection member 220, and the sliding cavity 211 is matched with the piston 300. The connection relationship between the first connection member 210 and the second connection member 220 is released, and the piston 300 can be taken out of the sliding cavity 211, and the first sealing ring 400 can be inspected, which is convenient for repair and maintenance and replacement of aged and damaged parts.

[0031] In one possible implementation, a second sliding groove 221 is provided on the outer wall of the second connecting member 220, and the second sliding groove 221 and the sliding cavity 211 of the first connecting member 210 are arranged relative to each other and connected, and the piston 300 is located between the first connecting member 210 and the second connecting member 220. The end ring of the perforation of the piston 300 that is away from the first opening 230 is provided with a piston sliding groove 310, and the piston sliding groove 310 of the piston 300 is slidably connected to the second sliding groove 221, and the sliding directions of the piston 300 on the first connecting member 210 and the second connecting member 220 are consistent.

[0032] In a possible implementation, a second sealing groove is provided on the annular inner side wall of the piston sliding groove 310 , a second sealing ring 320 is provided in the second sealing groove, and the second sealing ring 320 is located between the piston 300 and the second connecting member 220 .

[0033] In a possible implementation, the third opening 250 is located at the first connecting member 210, and the end of the second connecting member 220 away from the second opening 240 is provided with a piston 300 stopper 222, the piston 300 stopper 222 is arranged toward the sliding cavity 211, the piston 300 stopper 222 is provided with a notch 223, and the third opening 250 is connected with the sliding cavity 211 through the notch 223. Furthermore, the outer wall ring of the piston 300 stopper 222 away from the axis of the second opening 240 is provided with a notch 223, so as to increase the wind force support area and accelerate the upward movement speed of the piston 300.

[0034] In a possible implementation, a fourth sealing ring 270 is provided between the first connecting member 210 and the second connecting member 220 .

[0035] In a possible implementation, the first opening 230 and the third opening 250 are located on two adjacent sides of the connection shell 200. Further, the first opening 230 and the third opening 250 are both located on the first connection member 210, and the first opening 230 and the third opening 250 are respectively located on two adjacent sides of the first connection member 210, and the first opening 230 and the third opening 250 are respectively arranged near opposite ends of the first connection member 210.

[0036] In a possible implementation, a third sealing groove is provided on the outer wall of the piston 300 , a third sealing ring 330 is provided in the third sealing groove, and the third sealing ring 330 is located between the inner wall of the connecting shell 200 and the outer wall of the piston 300 .

[0037] In a possible implementation, a sealing stopper 260 is provided on the inner wall of the connection shell 200, and the sealing stopper 260 and the first sealing ring 400 are arranged opposite to each other, and the sealing stopper 260 is located at the annular periphery of the first sealing ring 400. The sealing stopper 260 has a certain guiding effect on the piston 300 and a certain limit on the first sealing ring 400, so as to prevent the first sealing ring 400 from being loosened and displaced during repeated loading and unloading of the sample tube 100 when fixed in the connection shell 200, and the first sealing ring 400 from being displaced, thereby extending the service life of the joint of the sample tube 100 and ensuring the detection accuracy of the physical adsorption instrument 500.

[0038] According to another aspect of the present application, a physical adsorption instrument 500 is provided. The physical adsorption instrument 500 is provided with the aforementioned physical adsorption instrument sample tube connector 510, which is convenient for loading and unloading and replacing the sample tube 100, detecting and analyzing different samples, and can ensure that each time the sample tube 100 is loaded for detection and analysis, the sample tube 100 and the interface of the sample tube 100 are tightly connected and have good air tightness, thereby ensuring the accuracy of the detection result.

[0039] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A physical adsorption instrument sample pipe joint, It is characterized in that include: Connecting the housing, the first sealing ring and the piston; The side wall of the connection shell is provided with a first opening, a second opening and a third opening, and the inner wall of one end of the connection shell provided with the first opening is provided with a first sealing ring, the first opening faces the sample interface of the physical adsorption instrument, the second opening faces away from the sample interface of the physical adsorption instrument, and the third opening is suitable for communicating with the output end of the gas source supply device; The piston is located in the connecting shell, the piston is slidably connected to the connecting shell, the piston is arranged opposite to the first sealing ring, and the third opening and the first sealing ring are respectively located at two ends of the sliding direction of the piston; The piston is provided with a through hole, and the through hole runs through both ends of the piston in the sliding direction. The first opening, the first sealing ring, the through hole and the second opening are arranged opposite to each other in sequence and match the sample tube.

2. The physical adsorption instrument sample tube connector according to claim 1, It is characterized in that The connecting shell includes a first connecting member and a second connecting member, the first opening and the first sealing ring are located in the first connecting member, the end of the first connecting member facing away from the first opening is provided with a sliding cavity matching the piston, the piston is located in the sliding cavity, the piston is slidably connected to the first connecting member, the second opening is located in the second connecting member, the third opening is located in the first connecting member or the second connecting member, and the end of the first connecting member facing away from the first opening is detachably connected to the second connecting member.

3. The physical adsorption instrument sample pipe joint according to claim 2, It is characterized in that The outer wall of the second connecting member is provided with a second sliding groove, and the second sliding groove and the sliding cavity of the first connecting member are arranged opposite to each other and connected, the piston is located between the first connecting member and the second connecting member, and the end ring of the perforation of the piston facing away from the first opening is provided with a piston sliding groove, and the piston sliding groove of the piston is slidably connected to the second sliding groove, and the sliding directions of the piston on the first connecting member and the second connecting member are consistent.

4. The physical adsorption instrument sample pipe joint according to claim 3, It is characterized in that A second sealing groove is provided on the annular inner side wall of the piston sliding groove, a second sealing ring is provided in the second sealing groove, and the second sealing ring is located between the piston and the second connecting member.

5. The physical adsorption instrument sample pipe joint according to claim 2, It is characterized in that The third opening is located at the first connecting member, and a piston limiting portion is provided at one end of the second connecting member away from the second opening. The piston limiting portion is arranged toward the sliding cavity, and the piston limiting portion is provided with a notch, and the third opening is connected to the sliding cavity through the notch.

6. The physical adsorption instrument sample pipe joint according to claim 2, It is characterized in that A fourth sealing ring is provided between the first connecting member and the second connecting member.

7. The physical adsorption instrument sample tube connector according to claim 1, It is characterized in that The first opening and the third opening are located on two adjacent sides of the connecting shell.

8. The physical adsorption instrument sample tube connector according to claim 1, It is characterized in that The outer side wall of the piston is provided with a third sealing groove, a third sealing ring is provided in the third sealing groove, and the third sealing ring is located between the inner side wall of the connecting shell and the outer side wall of the piston.

9. The physical adsorption instrument sample tube connector according to claim 1, It is characterized in that The inner wall of the connecting shell is provided with a sealing limit portion, the sealing limit portion and the first sealing ring are arranged opposite to each other, and the sealing limit portion is located at the annular periphery of the first sealing ring.

10. A physical adsorption instrument, It is characterized in that The physical adsorption instrument is provided with a physical adsorption instrument sample pipe joint as described in any one of claims 1-9.

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