CN214310343U - Capillary chromatographic column connecting device based on flat and conical surface secondary sealing - Google Patents
Capillary chromatographic column connecting device based on flat and conical surface secondary sealing Download PDFInfo
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- CN214310343U CN214310343U CN202120404422.0U CN202120404422U CN214310343U CN 214310343 U CN214310343 U CN 214310343U CN 202120404422 U CN202120404422 U CN 202120404422U CN 214310343 U CN214310343 U CN 214310343U
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Abstract
The utility model discloses a capillary chromatographic column connecting device based on flat, conical surface second grade is sealed belongs to the chromatographic column and connects the field. Capillary chromatographic column connecting device based on flat, conical surface secondary seal still includes including the connecting piece: the pressing cap is connected to the connecting piece in a threaded manner; the sealing element is connected between the pressing cap and the connecting piece; the chromatographic column body is connected in the pressure cap; the connecting piece is provided with an airflow channel hole, the sealing piece is provided with a through hole corresponding to the airflow channel hole, the through hole is precisely matched with the excircle of the chromatographic column body, and the pressing cap is used for fixing the sealing piece in the connecting piece; the utility model discloses a connecting piece and sealing member contact terminal surface's plane seal to and the sealing member conical surface is out of shape at the pressurized, make and penetrate the sealed conical surface of downthehole chromatographic column sealed, the two-stage is sealed has guaranteed chromatographic column body, sealing member and connecting piece three sealed reliable, and the dead volume of formation is very little.
Description
Technical Field
The utility model relates to a chromatographic column connects technical field, especially relates to capillary chromatographic column connecting device based on flat, conical surface second grade is sealed.
Background
In the gas chromatography detection equipment, sample components are repeatedly distributed or adsorbed/desorbed with a stationary phase for multiple times under the conveying action of carrier gas to realize separation, the sample components flow out of a chromatographic column and enter a detector to be detected, in order to meet different detection requirements, the capillary chromatographic column needs to be connected in various ways, various connecting pieces need to be applied in the connection, the tightness, dead volume, reliability and long-term stability of the connecting piece structure can directly influence the tightness, resistance change, carrier gas flow rate, pressure fluctuation and the like of a system gas circuit, and finally, the stability of the equipment and the qualitative and quantitative analysis result are greatly influenced.
Currently, mainstream chromatographic column connecting devices are mainly classified into the following two categories: 1) the connector comprises a glass and fused quartz connector, wherein a conical angle matched with the excircle of a chromatographic column is provided inside the connector, the conical hole of the connector is in contact with the end circle of the chromatographic column to realize primary sealing, and after high temperature, the polyimide outer surface skin of the chromatographic column is adhered to the inner surface of the glass connector to form sealing; 2) the metal joint that the conical surface is sealed, this kind of joint is through the cutting ferrule between the cap extrusion of pressing at both ends and the adapter, and the cutting ferrule conical surface is obstructed forced deformation with the adapter conical surface contact, and the pressurized deformation realizes sealing each other between adapter, cutting ferrule, the chromatographic column.
The glass and fused quartz joint is simple to install and small in dead volume, but has high requirements for cutting the end face of a chromatographic column, the binding force between the chromatographic column and the joint is small, the chromatographic column and the joint are easy to separate, after the chromatographic column and the joint are separated, outer skin residues of the chromatographic column are easy to remain in the joint, and the sealing effect is adversely affected during secondary installation; in order to achieve reliable sealing of the metal connector with the sealed conical surface, a sufficient pressure space needs to be reserved for the clamping sleeve, so that a large dead volume area is formed among the inner conical surface of the adapter, the outer conical surface of the clamping sleeve and the chromatographic column.
Aiming at the problems in the prior art, a capillary chromatographic column connecting device based on flat and conical surface secondary sealing is provided.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problems existing in the prior art and providing a capillary chromatographic column connecting device based on flat and conical surface secondary sealing.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
capillary chromatographic column connecting device based on flat, conical surface secondary seal still includes including the connecting piece:
the pressing cap is connected to the connecting piece in a threaded manner;
the sealing element is connected between the pressing cap and the connecting piece;
the chromatographic column body is connected in the pressure cap;
the connecting piece is provided with an airflow channel hole, the sealing piece is provided with a through hole corresponding to the airflow channel hole, the through hole is precisely matched with the excircle of the chromatographic column body, and the pressing cap is used for fixing the sealing piece in the connecting piece.
Preferably, the end part of the airflow channel hole is provided with a concave platform matched with the big end of the sealing element, and the sealing element is arranged in the concave platform on the connecting piece and plays a role in centering and positioning the sealing element.
Preferably, one end of the sealing element is provided with a conical surface.
Preferably, the pressing cap is hexagonal, the pressing cap is provided with a contact hole, and the chromatographic column body is connected in the contact hole.
Preferably, the outer wall of the connecting piece is provided with a first threaded hole, and the pressing cap is in threaded connection with the first threaded hole.
Preferably, a second threaded hole is formed in the pressing cap, and the connecting piece is in threaded connection with the second threaded hole.
Compared with the prior art, the utility model provides a capillary chromatographic column connecting device based on flat, conical surface second grade is sealed possesses following beneficial effect:
1. the capillary chromatographic column connecting device based on the flat and conical surface secondary sealing mainly comprises a sealing element, a connecting element and a pressing cap, wherein a capillary chromatographic column body sequentially penetrates through a contact hole in the pressing cap and a through hole in the center of the sealing element, the tail end of the capillary chromatographic column body is stopped at the joint part of the sealing element and the connecting element and does not protrude into a channel in the connecting element, the capillary chromatographic column body, the pressing cap and the sealing element are coaxially connected with an inlet of the connecting element, the pressing cap is screwed through thread matching, the pressing cap drives the sealing element to move to one side of the connecting element together, when the sealing element is moved to a certain position, the large plane of the sealing element is extruded by the connecting element to form a surface seal, the small-end conical surface of the sealing element is extruded and deformed by the contact hole on the pressing cap, and the deformed conical surface of the sealing element extrudes the outer circular surface of the chromatographic column body to form a seal, the contact surfaces of the components are mutually extruded to realize the sealing and fixing of the chromatographic column body.
2. This capillary chromatographic column connecting device based on flat, conical surface secondary seal, the connecting piece dead volume that the conical surface is sealed divide into two parts: the dead volume formed by the sealing area between the connector and the sealing element and the dead volume formed by the sealing area between the sealing element and the chromatographic column body, because the conical surface of the single conical surface sealing element needs enough movable area in the connector matched with the conical surface sealing element to ensure reliable device sealing, the redundant concave space is processed at the conical end part of the conical surface matching of the connector and the sealing element, the redundant space forms the dead volume between the connector and the sealing element, which is inevitable due to the conical surface sealing structure, the sealing is tightly adhered to the contact surface of the sealing element and the connector by using the connector with the flat and conical surface secondary sealing, the sealing is a plane sealing, the end surface of the chromatographic column body is in contact alignment with the large end surface of the connector, the structure and the use are different from the conical surface sealing, the sealing area between the connector and the sealing element does not exist, and the air flow path is the same as the path of the glass connector, the dead volume is very small.
3. According to the capillary chromatographic column connecting device based on the flat-conical surface secondary sealing, the sealing element is in contact with the large end surface of the connecting piece and is sealed under pressure, and the flatness of the end part of the chromatographic column body has little influence on the sealing property of the gas circuit, so that the requirement on the cutting flatness of the end part of the chromatographic column body is not high; because the device adopts a structural form of a mechanical extrusion sealing principle, and the sealing element is made of a high-temperature resistant material, the chromatographic column body can be reliably sealed with the device and is not influenced by factors such as the vibration of the working environment of equipment, the temperature of the working environment and the like in use; the adopted method is characterized in that the components are connected by screw threads, and the disassembly and the assembly are convenient, so that the method is applicable to a system needing to frequently replace a chromatographic column body.
The part that does not relate to in the device all is the same with prior art or can adopt prior art to realize, the utility model discloses a connecting piece and sealing member contact terminal surface's plane seal to and the sealing member conical surface is out of shape at the pressurized, make and penetrate the sealed conical surface of downthehole chromatographic column sealed, the two-stage is sealed has guaranteed chromatographic column body, sealing member and connecting piece three sealed reliable, and the dead volume of formation is very little.
Drawings
Fig. 1 is a schematic structural diagram of a two-way connection in an embodiment 2 of a capillary chromatographic column connecting device based on flat and conical surface secondary sealing according to the present invention;
fig. 2 is a schematic structural diagram of a two-way connection in embodiment 1 of the capillary chromatographic column connecting device based on the flat and conical surface secondary sealing of the present invention;
fig. 3 is a schematic structural diagram of a three-way connection in embodiment 1 of the capillary chromatographic column connecting device based on the flat and conical surface secondary sealing of the present invention;
fig. 4 is a schematic structural diagram of a four-way connection in embodiment 1 of the capillary chromatographic column connecting device based on the flat and conical surface secondary sealing of the present invention;
fig. 5 is a schematic structural view of a flat plate multi-pass connection in embodiment 1 of the capillary chromatographic column connecting device based on the flat and conical surface secondary sealing of the present invention.
In the figure: 1. pressing the cap; 2. a seal member; 3. a connecting member; 4. a chromatography column body.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Example 1:
referring to fig. 2-5, the capillary chromatographic column connecting device based on the flat and conical surface secondary sealing comprises a connecting piece 3 and further comprises:
the pressing cap 1 is connected to the connecting piece 3 in a threaded manner;
the sealing element 2 is connected between the pressing cap 1 and the connecting element 3;
the chromatographic column body 4 is connected in the pressure cap 1;
wherein, be equipped with the air current passageway hole on the connecting piece 3, be equipped with the through-hole corresponding with the air current passageway hole on the sealing member 2, the through-hole is accurate with the excircle of chromatographic column body 4 and is matchd, presses cap 1 to be used for fixing sealing member 2 in connecting piece 3.
The end part of the airflow channel hole is provided with a concave platform matched with the big head of the sealing element 2, and the sealing element 2 is arranged in the concave platform on the connecting element 3 and plays a role in centering and positioning the sealing element 2.
One end of the sealing element 2 is provided with a conical surface.
The appearance of pressing cap 1 is the hexagon, and is equipped with the contact hole on pressing cap 1, and chromatographic column body 4 is connected in the contact hole.
The outer wall of connecting piece 3 is equipped with first screw hole, presses 1 threaded connection of cap in first screw hole.
Example 2:
referring to fig. 1, the capillary chromatographic column connecting device based on the flat and conical surface secondary sealing comprises a connecting piece 3 and further comprises:
the pressing cap 1 is connected to the connecting piece 3 in a threaded manner;
the sealing element 2 is connected between the pressing cap 1 and the connecting element 3;
the chromatographic column body 4 is connected in the pressure cap 1;
wherein, be equipped with the air current passageway hole on the connecting piece 3, be equipped with the through-hole corresponding with the air current passageway hole on the sealing member 2, the through-hole is accurate with the excircle of chromatographic column body 4 and is matchd, presses cap 1 to be used for fixing sealing member 2 in connecting piece 3.
The end part of the airflow channel hole is provided with a concave platform matched with the big head of the sealing element 2, and the sealing element 2 is arranged in the concave platform on the connecting element 3 and plays a role in centering and positioning the sealing element 2.
One end of the sealing element 2 is provided with a conical surface.
The appearance of pressing cap 1 is the hexagon, and is equipped with the contact hole on pressing cap 1, and chromatographic column body 4 is connected in the contact hole.
The pressing cap 1 is provided with a second threaded hole, and the connecting piece 3 is in threaded connection with the second threaded hole.
The utility model comprises an axisymmetric two-way connection, an axisymmetric three-way connection, an axisymmetric four-way connection and a two-way and multi-way connection in a flat plate form, mainly comprising a sealing element 2, a connecting element 3 and a pressing cap 1, wherein a capillary chromatographic column body 4 sequentially passes through a contact hole on the pressing cap 1 and a through hole at the center of the sealing element 2, the tail end of the capillary chromatographic column body is stopped at the joint part of the sealing element 2 and the connecting element 3 and does not protrude into a channel in the connecting element 3, the capillary chromatographic column body 4, the pressing cap 1, the sealing element 2 and an inlet of the connecting element 3 are coaxially connected, the pressing cap 1 is screwed through thread matching, the pressing cap 1 drives the sealing element 2 to move to one side of the connecting element 3 together, when the capillary chromatographic column body 4 is moved to a certain position, the large plane of the sealing element 2 is extruded by the connecting element 3 to form a face seal, the small conical surface of the sealing element 2 is extruded and deformed by the contact hole on the pressing cap 1, the sealing element 2 after deformation extrudes the outer circular surface of the chromatographic column body 4 to form a seal, the contact surfaces of the parts are mutually extruded to realize the sealing and fixing of the chromatographic column body 4.
Wherein, sealing member 2 is used for the pressurized deformation and forms sealed part with connecting piece 3 and chromatographic column body 4 etc. because of equipment operating temperature is higher, in order to guarantee reliable sealed, sealing member 2 material can select metal or high temperature resistant polymer material for use, its axle center position has seted up the through-hole with 4 excircle precision matching of chromatographic column body, sealing member 2 one end has set up the conical surface that has certain angle, sealing member 2 is adorned between connecting piece 3 and pressure cap 1, when receiving the extrusion, the big terminal surface of sealing member 2 pastes tight seal with connecting piece 3, the little conical surface of sealing member 2 receives the extrusion of pressure cap contact hole and takes place the deformation, the tip of taking place the deformation back little conical surface extrudees simultaneously and passes 4 excircles of chromatographic column body wherein, thereby sealed with the excircle.
The connecting piece 3 is used for connecting and forms a sealing area together with other pieces, the end part of the connecting piece 3 is provided with a connecting thread end which is in threaded fit with the pressing cap 1, an airflow channel hole is formed inside the connecting piece, the aperture does not exceed the outer diameter of the chromatographic column body 4, the end part of the outlet hole of the airflow channel is provided with a concave platform which is matched with the big end of the sealing piece 2, and the sealing piece 2 is arranged in the concave platform of the connecting piece 3 and plays a role in centering and positioning the sealing piece 2.
The dead volume of the conical surface sealed connecting piece 3 is divided into two parts: the dead volume formed by the sealing area between the connector 3 and the sealing element 2 and the dead volume formed by the sealing area between the sealing element 2 and the chromatographic column body 4, because the single conical surface of the conical sealing element 2 needs enough movable area in the connector 3 matched with the conical surface to ensure reliable device sealing, an excessive concave space is processed at the conical end part of the conical surface matching of the connector 3 and the sealing element 2, the excessive space forms the dead volume between the connector 3 and the sealing element 2, which is inevitable due to the conical surface sealing structure, and the flat and conical surface secondary sealing joint is used for tightly sealing the contact surface between the sealing element 2 and the connector 3, which is a plane sealing, and the end surface of the chromatographic column body 4 is in contact alignment with the large end surface of the connector 3, which is different from the conical surface sealing in structure and use, and the sealing area between the connector 3 and the sealing element 2 does not exist, the air flow path is the same as that of the glass joint, and the dead volume is very small.
The sealing element 2 and the large end face of the connecting element 3 are in contact and pressed for sealing, and the flatness of the end part of the chromatographic column body 4 has little influence on the sealing performance of the gas circuit, so that the requirement on the flatness of the end part of the chromatographic column body 4 in cutting is not high; because the device adopts a structural form of a mechanical extrusion sealing principle, and the sealing element 2 is made of a high-temperature resistant material, in use, the chromatographic column body 4 can be reliably sealed with the device and is not influenced by factors such as the vibration of the working environment of equipment, the temperature of the working environment and the like; the adopted technical scheme is that the chromatographic column is in threaded connection, and each component is convenient to disassemble and install and is suitable for a system needing frequent replacement of the chromatographic column body 4.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (6)
1. Capillary chromatographic column connecting device based on flat, conical surface secondary seal includes connecting piece (3), its characterized in that still includes:
the pressing cap (1) is in threaded connection with the connecting piece (3);
the sealing element (2) is connected between the pressing cap (1) and the connecting piece (3);
the chromatographic column body (4) is connected in the pressure cap (1);
the chromatographic column is characterized in that an airflow channel hole is formed in the connecting piece (3), a through hole corresponding to the airflow channel hole is formed in the sealing piece (2), the through hole is precisely matched with the outer circle of the chromatographic column body (4), and the pressing cap (1) is used for fixing the sealing piece (2) in the connecting piece (3).
2. The capillary chromatographic column connecting device based on the flat-conical surface secondary sealing of claim 1, wherein the end part of the gas flow channel hole is provided with a concave platform matched with the big end of the sealing element (2), and the sealing element (2) is arranged in the concave platform on the connecting piece (3) and plays a role in centering and positioning the sealing element (2).
3. Capillary chromatography column connection device based on flat and conical surface secondary sealing according to claim 2, characterized in that one end of the sealing element (2) is provided with a conical surface.
4. The capillary chromatographic column connecting device based on the flat-conical surface secondary seal is characterized in that the pressing cap (1) is hexagonal in shape, a contact hole is formed in the pressing cap (1), and the chromatographic column body (4) is connected in the contact hole.
5. The capillary chromatography column connecting device based on the flat-conical surface secondary seal of claim 4, wherein the outer wall of the connecting piece (3) is provided with a first threaded hole, and the pressing cap (1) is screwed in the first threaded hole.
6. The capillary chromatographic column connecting device based on the flat-conical surface secondary seal is characterized in that the pressing cap (1) is provided with a second threaded hole, and the connecting piece (3) is in threaded connection with the second threaded hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120404422.0U CN214310343U (en) | 2021-02-24 | 2021-02-24 | Capillary chromatographic column connecting device based on flat and conical surface secondary sealing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120404422.0U CN214310343U (en) | 2021-02-24 | 2021-02-24 | Capillary chromatographic column connecting device based on flat and conical surface secondary sealing |
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| CN214310343U true CN214310343U (en) | 2021-09-28 |
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| CN202120404422.0U Active CN214310343U (en) | 2021-02-24 | 2021-02-24 | Capillary chromatographic column connecting device based on flat and conical surface secondary sealing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117146083A (en) * | 2023-08-30 | 2023-12-01 | 广东省麦思科学仪器创新研究院 | Vacuum two-way pipe joint and chromatograph comprising same |
| WO2024085942A1 (en) * | 2022-10-17 | 2024-04-25 | Agilent Technologies, Inc. | Chromatography column adaptor and use for fluidic connections |
-
2021
- 2021-02-24 CN CN202120404422.0U patent/CN214310343U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024085942A1 (en) * | 2022-10-17 | 2024-04-25 | Agilent Technologies, Inc. | Chromatography column adaptor and use for fluidic connections |
| CN117146083A (en) * | 2023-08-30 | 2023-12-01 | 广东省麦思科学仪器创新研究院 | Vacuum two-way pipe joint and chromatograph comprising same |
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