CN217587079U - Capillary chromatographic column connecting device capable of multiplexing clamping sleeve - Google Patents
Capillary chromatographic column connecting device capable of multiplexing clamping sleeve Download PDFInfo
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- CN217587079U CN217587079U CN202221772577.0U CN202221772577U CN217587079U CN 217587079 U CN217587079 U CN 217587079U CN 202221772577 U CN202221772577 U CN 202221772577U CN 217587079 U CN217587079 U CN 217587079U
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Abstract
The utility model discloses a can multiplexing capillary chromatographic column connecting device of cutting ferrule belongs to capillary chromatographic column and connects the field. A capillary chromatographic column connecting device capable of reusing a clamping sleeve comprises a connecting device and a capillary chromatographic column, wherein the two-way connecting seat is internally provided with a central capillary through hole, the clamping sleeve is fixedly connected in the two-way connecting seat, the two-way connecting seat is rotatably connected with a pressing cap, the pressing cap and the clamping sleeve are also internally provided with the central capillary through hole, and the central capillary through holes formed in the two-way connecting seat, the pressing cap and the clamping sleeve are matched with the capillary chromatographic column; the utility model discloses a cutting ferrule plane end and the planar good sealing of connection port obviously reduce the dead volume in the gas circuit, through the matching design to pressing the cap to compress tightly the conical surface, the cutting ferrule produces the even deformation of top-down when the pressurized, and the pressure that produces is less, and sealed area of contact is great, can not cause local excessive atress to warp because the conical surface matches the improper condition that the capillary chromatographic column of locking appears.
Description
Technical Field
The utility model relates to a capillary chromatographic column connects technical field, especially relates to a can multiplexing capillary chromatographic column connecting device of cutting ferrule.
Background
At present, in the field of gas chromatography detection of chemical analysis technology, engineers often need to frequently combine and switch capillary column systems according to different properties of a detected object and a capillary column, so that the capillary column often needs to complete connection and combination of gas circuits through various connecting devices. Among the commonly used types are: the two-way or three-way quartz glass tube realizes the clamping and sealing with the capillary chromatographic column through the reducing of the inner pore, has the advantages of small dead volume after the connection, simple and convenient installation, high price, low connection strength, easy air leakage and no reuse, and the capillary chromatographic column needs to be cut for each connection to cause the change of the length of a column system; the metal two-way connector tightly holds the capillary chromatographic column after being compressed and deformed through the high-temperature-resistant nonmetal clamping sleeve to realize connection and sealing of the gas circuit, and has the advantages of high connection strength and reliable installation, and has the defects of single use of the clamping sleeve and larger dead volume of the gas circuit; the flat four-way connector of metal, the nonmetal cutting ferrule of high temperature is also required to be passed through, compresses tightly the capillary chromatographic column after warping, realizes the connection and the sealed of gas circuit, and the advantage is small, and is easy and simple to handle, and the installation reliability is good, and the shortcoming is expensive, cutting ferrule single use, and the gas circuit dead volume is obvious.
The metal connectors adopting the non-metal cutting sleeves in the prior art have common defects, after the metal connectors are heated at high temperature in the detection process, the cutting sleeves and the capillary chromatographic columns are tightly locked and cannot be taken out smoothly, the cutting sleeves are usually required to be removed by cutting the capillary chromatographic columns, the using amount of the cutting sleeves is increased, the length of the capillary chromatographic columns is changed continuously, for some column systems with air resistance required to be measured and calculated accurately, the air resistance parameters of the column systems need to be corrected continuously manually due to the change of the length of the capillary chromatographic columns, and errors and complexity in the detection test process are increased; and when the cutting ferrule compresses tightly excessively and produces excessive plastic deformation, can die with the inside screw thread card of the port of metal connecting seat, lead to the cutting ferrule can't completely take out, need take out it after cutting the cutting ferrule with the instrument, damage the sealed face and the screw thread of metal connecting seat easily in the cutting process, cause the leakproofness to descend or the screw thread damages, appear occasionally that the cutting ferrule can't clear away totally, cause scrapping completely of metal connecting seat.
Aiming at the problems in the prior art, a capillary chromatographic column connecting device with a reusable cutting sleeve is provided.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem that the connection device is inconvenient to connect and poor in sealing performance in the prior art, and providing a capillary chromatographic column connection device capable of reusing a clamping sleeve.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a can multiplexing capillary chromatographic column connecting device of cutting ferrule, connecting device includes two-way connecting seat and capillary chromatographic column, has seted up central capillary through-hole in the two-way connecting seat, fixedly connected with cutting ferrule in the two-way connecting seat, rotate on the two-way connecting seat to be connected with and press the cap, also all seted up central capillary through-hole in pressing cap and the cutting ferrule, the two-way connecting seat, press the central capillary through-hole of seting up in cap and the cutting ferrule all with capillary chromatographic column phase-match.
Preferably, the end part of the two-way connecting seat is provided with a connecting port, the external screw thread of the pressing cap is provided with a high-precision threaded hole, and the external screw thread of the pressing cap is matched with the high-precision threaded hole of the connecting port.
Preferably, one end of the cutting sleeve, which is far away from the connecting port, is set to be a conical structure, one end of the pressing cap, which is close to the connecting port, is provided with a high-precision conical surface, and the conical structure of the cutting sleeve is meshed with the high-precision conical surface arranged on the pressing cap.
Preferably, the two-way connecting base can be changed into a four-way connecting base, the four-way connecting base can be formed by arranging a bypass capillary through hole on the position of the central capillary through hole of the two-way connecting base to form a multi-way air passage, and the bypass capillary through holes arranged in the four-way connecting base are not aligned with each other.
Preferably, the central capillary through hole and the bypass capillary through hole are both treated by chemical inerting, and the bottom end of the connecting port is a high-precision smooth plane.
Preferably, the two-way connecting seat and the four-way connecting seat are both made of high-temperature-resistant and high-strength metal materials, and the clamping sleeve is made of high-temperature-resistant non-metal materials.
Preferably, the two-way connecting seat, the four-way connecting seat and the clamping sleeve end part are in a standard hexagonal head structure.
Compared with the prior art, the utility model provides a can multiplexing capillary chromatographic column connecting device of cutting ferrule possesses following beneficial effect:
1. according to the capillary chromatographic column connecting device, the central capillary through hole and the bypass capillary through hole of the internal gas circuit are subjected to surface chemical inert treatment, so that polarization and adsorption of a metal body to a detected object can be avoided, a detection result can be improved, and the half-peak width and trailing phenomena of heavy components are reduced; the connecting port of the central capillary through hole adopts a high-precision processing plane, when the non-metal cutting sleeve is stressed and compressed, the non-metal cutting sleeve can be tightly meshed with the plane with an ultralow clearance, and the plane end of the cutting sleeve and the plane of the connecting port can be well sealed; in addition, the fastening pressure of cutting ferrule and two-way connecting seat disappears the back, even the cutting ferrule atress warp the contact surface increase, still can not bond the locking with the port plane, adopts the instrument slightly to stir the cutting ferrule after, can throw off it and two-way connecting seat.
2. The pressure cap on the capillary chromatographic column connecting device is provided with the high-precision conical surface matched with the nonmetal cutting sleeve, and when the cutting sleeve is pressed by the pressure cap under stress, the conical surface can ensure the centering of the central hole of the cutting sleeve and the connecting seat, thereby realizing the centering of the capillary chromatographic column and the two-way connecting seat, ensuring the accuracy of gas circuit connection, and avoiding generating dead volume and air resistance due to centering dislocation.
3. The clamping sleeve on the capillary chromatographic column connecting device enables the clamping sleeve to be pressed and deformed by screwing the pressing cap, the capillary chromatographic column is tightly held, and meanwhile, the plane end of the clamping sleeve is tightly pressed and meshed with the end plane of the two-way connecting seat, so that the connection and the sealing of the capillary chromatographic column are realized. Through the matching design of pressing the cap to compress tightly the conical surface, the card cover produces the even deformation of top-down when the pressurized, and is less to the pressure that capillary chromatographic column produced, and sealed area of contact is great, can realize the sealed of gas circuit under less deflection, can not cause local excessive stress deformation because of the conical surface matching is improper to the condition that causes the capillary chromatographic column of locking. Therefore, the clamping sleeve can still realize the sealing and the fixing of the capillary chromatographic column after being used for many times, so that the device has the performance of being reused for many times.
4. This cutting ferrule on capillary chromatographic column connecting device can be according to the user demand, is two-way connecting seat or cross connecting seat with the connecting seat design, and the structure that leads to more uses two-way structure as the basis, on perpendicular to two-way central gas path, designs the bypass gas circuit, can realize leading to the gas circuit more, wherein direct alignment between the bypass gas circuit to avoid producing excessive air current disturbance, influence test accuracy.
Drawings
Fig. 1 is a schematic structural view of a capillary chromatographic column two-way connection device with a reusable card sleeve according to the present invention;
fig. 2 is a cross-sectional view of the capillary chromatographic column two-way connecting device with reusable cutting sleeve.
Fig. 3 is a schematic structural diagram of a four-way connection device for a capillary chromatography column with a reusable ferrule according to the present invention;
fig. 4 is a cross-sectional view of the capillary chromatographic column four-way connection device with reusable cutting sleeve of the present invention.
In the figure: 1. a two-way connecting seat; 2. a four-way connecting seat; 3. pressing the cap; 4. a card sleeve; 5. a connection port; 6. a capillary chromatography column; 7. a central capillary through hole; 8. bypassing the capillary bore.
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.
Referring to fig. 1-4, a capillary chromatographic column connecting device capable of reusing a clamping sleeve comprises a two-way connecting seat 1 and a capillary chromatographic column 6, wherein a central capillary through hole 7 is formed in the two-way connecting seat 1, the clamping sleeve 4 is fixedly connected in the two-way connecting seat 1, a pressing cap 3 is rotatably connected on the two-way connecting seat 1, the pressing cap 3 and the clamping sleeve 4 are both provided with the central capillary through hole 7, and the central capillary through hole 7 formed in the two-way connecting seat 1, the pressing cap 3 and the clamping sleeve 4 are both matched with the capillary chromatographic column 6.
Connecting port 5 has been seted up to 1 tip of two-way connecting seat, presses 3 outside buddhist precision screws of cap, and connecting port 5 has seted up high accuracy screw hole, presses 3 outside precision screws of cap and the high accuracy screw hole phase-match of connecting port 5.
The end of the cutting sleeve 4 far away from the connecting port 5 is set to be a conical structure, the end of the pressing cap 3 close to the connecting port 5 is provided with a high-precision conical surface, and the conical structure of the cutting sleeve 4 is meshed with the high-precision conical surface arranged on the pressing cap 3.
The two-way connecting seat 1 can be changed into a four-way connecting seat 2, the four-way connecting seat 2 can be formed by arranging a bypass capillary through hole 8 on the position of a central capillary through hole 7 of the two-way connecting seat 1 to form a multi-way air path, and the bypass capillary through holes 8 arranged in the four-way connecting seat 2 are not aligned with each other.
The central capillary through hole 7 and the bypass capillary through hole 8 are both treated by chemical inerting, and the bottom end of the connecting port 5 is a high-precision smooth plane.
The two-way connecting seat 1 and the four-way connecting seat 2 are both made of high-temperature-resistant and high-strength metal materials, and the cutting sleeve 4 is made of high-temperature-resistant non-metal materials.
The two-way connecting seat 1, the four-way connecting seat 2 and the end part of the clamping sleeve 4 are in a standard hexagonal head structure.
In the using process, according to the column system arrangement condition of a column box in a gas chromatograph and according to the connection requirement, the two-way connecting seat 1 or the four-way connecting seat 2 is selected, for example, the two-way connecting seat 1 is selected, a capillary chromatographic column 6 to be connected is taken firstly, penetrates through the pressing cap 3 and then penetrates through the clamping sleeve 4, the conical surface of the clamping sleeve 4 is required to be ensured to face the pressing cap 3, after the three parts are worn, the capillary chromatographic column 6 is aligned to the thread of the connecting port 5 at one side of the two-way connecting seat 1, the pressing cap 3 is screwed in by bare hands, in the screwing process, the capillary chromatographic column 6 is kept to continuously support against the port plane in the two-way connecting seat 1 as far as possible, after the three parts are screwed in place, whether the capillary chromatographic column 6 is pushed to the limit position is determined, after the position is determined, the pressing cap 3 is screwed in place by using a hexagonal wrench, the complicated process of double-wrench operation is avoided, and after the leak detector is used for testing the tightness, the chemical tester can adopt a GC-Agilent7890B; i.e. the connection of the capillary chromatography column 6 on one side is completed. After the connection of the capillary chromatographic column 6 at one side is completed, the capillary chromatographic column 6 at the other side can be connected and installed.
According to the capillary chromatographic column connecting device, the central capillary through hole 7 and the bypass capillary through hole 8 of the internal gas path are subjected to surface chemical inert treatment, so that polarization and adsorption of a metal body to a detected object can be avoided, a detection result can be improved, and the half-peak width and trailing phenomena of heavy components are reduced; the connecting port 5 adopts a high-precision processing plane, when the non-metal cutting sleeve 4 is pressed by force, the non-metal cutting sleeve can be tightly meshed with the plane with an ultralow clearance, and the plane end of the cutting sleeve 4 and the plane of the connecting port 5 are well sealed, and compared with the conventional contact sealing mode, the plane sealing mode can obviously reduce the dead volume in a gas path; in addition, cutting ferrule 4 and two-way connecting seat 1's fastening pressure disappears the back, even cutting ferrule 4 atress deformation contact surface increases, still can not bond the locking with the plane of connection port 5, adopts the instrument to stir cutting ferrule 4 back slightly, can make it drop.
Through being equipped with the high accuracy conical surface that non-metal cutting ferrule 4 matches, when pressing the cap to receive 3 forces to compress tightly cutting ferrule 4, 4 centre openings of cutting ferrule and two-way connecting seat 1's centering can be guaranteed to this conical surface to realize capillary chromatographic column 6 and two-way connecting seat 1 centering, guarantee the accuracy that the gas circuit is connected, avoid producing dead volume and air resistance because of the centering dislocation.
Through screwing up the gland 3, make cutting ferrule 4 compressive deformation, hold capillary chromatographic column 6 tightly, make the plane end of cutting ferrule 4 compress tightly the tip plane of meshing two-way connecting seat 1 simultaneously, realize capillary chromatographic column 6's connection and sealed. Through the matching design that compresses tightly the conical surface to pressing cap 3, cutting ferrule 4 produces the even deformation of top-down when the pressurized, and is less to the pressure that capillary chromatographic column 6 produced, and sealed area of contact is great, can realize the sealed of gas circuit under less deflection, can not cause local excessive atress to warp because of conical surface matching is improper to cause the condition of locking capillary chromatographic column 6. Therefore, the cutting sleeve 4 can still realize the sealing and the fixing of the capillary chromatographic column 6 after being used for many times, so that the connecting device has the performance of repeated reuse.
Before using, can be according to the user demand, be two-way connecting seat 1 or four-way connecting seat 2 with the connecting seat design, the structure that leads to more uses two-way structure as the basis, on perpendicular to two-way central gas path, designs the bypass gas path, can realize leading to the gas path more, wherein direct alignment between the bypass gas path to avoid producing excessive air current disturbance, influence test accuracy.
The above, only be the embodiment of the preferred 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, which are designed to be replaced or changed equally, all should be covered within the protection scope of the present invention.
Claims (7)
1. The utility model provides a capillary chromatographic column connecting device of multiplexing cutting ferrule, its characterized in that, connecting device includes two-way connecting seat (1) and capillary chromatographic column (6), set up central capillary through-hole (7) in two-way connecting seat (1), fixedly connected with cutting ferrule (4) in two-way connecting seat (1), it presses cap (3) to rotate to be connected with on two-way connecting seat (1), also all seted up central capillary through-hole (7) in pressing cap (3) and cutting ferrule (4), central capillary through-hole (7) of seting up in two-way connecting seat (1), pressure cap (3) and cutting ferrule (4) all with capillary chromatographic column (6) phase-match.
2. The capillary chromatographic column connecting device with the reusable ferrule as claimed in claim 1, wherein a connecting port (5) is formed at an end of the two-way connecting seat (1), a precision thread is formed on the outside of the pressing cap (3), a high-precision threaded hole is formed on the connecting port (5), and the precision thread on the outside of the pressing cap (3) is matched with the high-precision threaded hole of the connecting port (5).
3. The capillary chromatographic column connecting device with the reusable cutting sleeve as claimed in claim 2, characterized in that one end of the cutting sleeve (4) far away from the connecting port (5) is provided with a conical structure, one end of the pressing cap (3) near the connecting port (5) is provided with a high-precision conical surface, and the conical structure of the cutting sleeve (4) is engaged with the high-precision conical surface arranged on the pressing cap (3).
4. The capillary chromatographic column connecting device with the reusable ferrule as claimed in claim 2, wherein the two-way connecting seat (1) can be changed into a four-way connecting seat (2), the four-way connecting seat (2) can be formed by forming a bypass capillary through hole (8) in the position of the central capillary through hole (7) of the two-way connecting seat (1) to form a multi-way air passage, and the bypass capillary through holes (8) formed in the four-way connecting seat (2) are not aligned with each other.
5. A reusable ferrule capillary chromatography column connection device according to claim 4, characterized in that the central capillary through hole (7) and the bypass capillary through hole (8) are chemically inert, and the bottom end of the connection port (5) is a high precision smooth plane.
6. A reusable capillary chromatography column connecting device with a clamping sleeve according to claim 5, characterized in that the two-way connecting seat (1) and the four-way connecting seat (2) are both made of high temperature resistant and high strength metal material, and the clamping sleeve (4) is both made of high temperature resistant non-metal material.
7. A reusable ferrule capillary chromatography column connecting device according to claim 5, characterized in that the two-way connecting seat (1), the outside of the four-way connecting seat (2) and the end of the ferrule (4) are in a standard hexagonal head structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221772577.0U CN217587079U (en) | 2022-07-11 | 2022-07-11 | Capillary chromatographic column connecting device capable of multiplexing clamping sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221772577.0U CN217587079U (en) | 2022-07-11 | 2022-07-11 | Capillary chromatographic column connecting device capable of multiplexing clamping sleeve |
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| Publication Number | Publication Date |
|---|---|
| CN217587079U true CN217587079U (en) | 2022-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221772577.0U Active CN217587079U (en) | 2022-07-11 | 2022-07-11 | Capillary chromatographic column connecting device capable of multiplexing clamping sleeve |
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| CN (1) | CN217587079U (en) |
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- 2022-07-11 CN CN202221772577.0U patent/CN217587079U/en active Active
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