CN216955881U - Connecting device and detector - Google Patents

Abstract

The utility model relates to the field of detection devices, and discloses a connecting device and a detector. The connecting device is used for connecting the capillary chromatographic column and the thermal conductivity detector, and comprises a sleeve, wherein the sleeve is used for being sleeved outside the capillary chromatographic column and connected with the thermal conductivity detector, a gas channel is formed between the sleeve and the capillary chromatographic column, and the gas channel is used for providing carrier gas for the capillary chromatographic column and the thermal conductivity detector simultaneously. When the technical scheme is used, the capillary chromatographic column and the gas path channel provide carrier gas for the thermal conductivity detector at the same time, wherein the carrier gas of the capillary chromatographic column is used for detecting through the capillary chromatographic column, and the carrier gas of the gas path channel plays a role in meeting the carrier gas flow of the thermal conductivity detector, namely, the carrier gas flow entering the thermal conductivity detector from the capillary chromatographic column is supplemented, so that the requirement on the carrier gas flow of the thermal conductivity detector is met, and the connection of the thermal conductivity detector and the capillary chromatographic column is realized.

Description

Connecting device and detector

Technical Field

The utility model relates to the field of detection devices, in particular to a connecting device and a detector.

Background

A Thermal Conductivity Detector (TCD) is a concentration type detector that responds by utilizing the difference in thermal conductivity between a measured component and a carrier gas, but because of its large size and low sensitivity, a thermal conductivity detector is generally used in conjunction with a packed column to acquire more accurate detection data. However, with the advent of capillary chromatographic columns, the reproducibility, stability, precision and resolution of capillary chromatographic columns are all significantly improved compared to packed columns, and therefore more accurate detection data can be obtained if a thermal conductivity detector is used in conjunction with a capillary chromatographic column. However, the difference between the volume of the thermal conductivity detector and the volume of the capillary chromatographic column is too large, and the carrier gas flow of the capillary chromatographic column is too low to meet the requirement of the carrier gas flow of the thermal conductivity detector, so that the thermal conductivity detector cannot be used with the capillary chromatographic column in the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problem that a thermal conductivity detector and a capillary chromatographic column cannot be used together in the prior art, and provides a connecting device and a detector.

In order to achieve the above object, in one aspect, the present invention provides a connection device for connecting a capillary chromatographic column and a thermal conductivity detector, where the connection device includes a sleeve, the sleeve is configured to be sleeved outside the capillary chromatographic column and connected to the thermal conductivity detector, a gas channel is formed between the sleeve and the capillary chromatographic column, and the gas channel is configured to provide a carrier gas to the thermal conductivity detector simultaneously with the capillary chromatographic column.

Preferably, a first connecting structure is disposed at an end of the casing different from the end connected to the thermal conductivity detector, so as to connect to the capillary chromatographic column.

Preferably, the first connecting structure comprises an internal thread arranged on the inner wall of the sleeve, and the internal thread is used for connecting an interface screw of the capillary chromatographic column.

Preferably, the sleeve is provided with a second connecting structure for connecting the thermal conductivity detector, and one end of the sleeve, which is different from the end provided with the first connecting structure, extends into the thermal conductivity detector.

Preferably, the second connecting structure includes a joint nut provided on an outer peripheral wall of the sleeve, the joint nut being used for connecting a threaded interface of the thermal conductivity detector.

Preferably, the wall of the sleeve is provided with an inlet of the air passage channel.

Preferably, the connecting device further comprises a pressure maintaining valve, and the pressure maintaining valve is connected with the inlet of the air channel.

Preferably, the connecting device further comprises a three-way pipe, the three-way pipe comprises a linear casing section with two openings and an interface section with one opening, the interface section is used for connecting the pressure stabilizing valve, and the casing section is sleeved on the casing so as to communicate the interface section with the inlet of the gas path channel.

Preferably, the interface section is provided with a changeover valve for connecting the pressure maintaining valve.

In another aspect, the utility model provides a detector, which includes a capillary chromatographic column, a thermal conductivity detector and the above connecting device, wherein the capillary chromatographic column is connected to the thermal conductivity detector through the connecting device.

Through the technical scheme, establish the sleeve pipe at the outside cover of capillary chromatographic column, connect capillary chromatographic column and thermal conductivity detector through the sleeve pipe, form the gas circuit passageway between sleeve pipe and the capillary chromatographic column, during the use, capillary chromatographic column and gas circuit passageway provide the carrier gas to the thermal conductivity detector simultaneously, wherein the carrier gas of route capillary chromatographic column is used for detecting through the capillary chromatographic column, the carrier gas of route gas circuit passageway plays the effect that satisfies thermal conductivity detector carrier gas flow, supplement the carrier gas flow that enters into the thermal conductivity detector from the capillary chromatographic column promptly, with the demand that satisfies thermal conductivity detector carrier gas flow, the usefulness of thermal conductivity detector and capillary chromatographic column has been realized.

Drawings

Fig. 1 is a schematic structural view of one embodiment of the connecting device of the present invention.

Description of the reference numerals

1. A sleeve; 2. a capillary chromatographic column; 3. an interface screw; 4. a union nut; 5. a three-way pipe; 6. a transfer valve; 7. an interface valve.

Detailed Description

The following detailed description of embodiments of the utility model refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

The utility model provides a connecting device for connecting a capillary chromatographic column 2 and a thermal conductivity detector, wherein the connecting device comprises a sleeve 1, the sleeve 1 is used for being sleeved outside the capillary chromatographic column 2 and connected with the thermal conductivity detector, a gas channel is formed between the sleeve 1 and the capillary chromatographic column 2 and used for providing carrier gas for the thermal conductivity detector simultaneously with the capillary chromatographic column 2, as shown in fig. 1, and an arrow in the figure is the flowing direction of the carrier gas.

Through the technical scheme, establish sleeve pipe 1 at 2 outside covers of capillary chromatographic column, connect capillary chromatographic column 2 and thermal conductivity detector through sleeve pipe 1, form the gas circuit passageway between sleeve pipe 1 and capillary chromatographic column 2, during the use, capillary chromatographic column 2 and gas circuit passageway provide the carrier gas to the thermal conductivity detector simultaneously, wherein the carrier gas of route capillary chromatographic column 2 is used for detecting through capillary chromatographic column 2, the carrier gas of route gas circuit passageway plays the effect that satisfies thermal conductivity detector carrier gas flow, supplement the carrier gas flow that enters into in the thermal conductivity detector from capillary chromatographic column 2 promptly, with the demand that satisfies thermal conductivity detector carrier gas flow, the continuous use of thermal conductivity detector and capillary chromatographic column 2 has been realized.

In order to facilitate connection between the sleeve 1 and the capillary chromatographic column 2 and avoid the influence of misalignment during detection on the detection result, it is preferable that, in the embodiment shown in fig. 1, a first connection structure is disposed at an end of the sleeve 1 different from the end connected to the thermal conductivity detector, for connecting the capillary chromatographic column 2. Of course, in other embodiments, the sleeve 1 and the capillary column 2 may be connected by a bracket without providing the first connection structure, so as to fix the relative positions of the sleeve 1 and the capillary column 2, thereby forming the air passage channel.

The specific structure of the first connection structure is not limited, and preferably, as shown in fig. 1, in the embodiment, the first connection structure includes an internal thread disposed on an inner wall of the sleeve 1, the internal thread is used for connecting the interface screw 3 of the capillary chromatographic column 2, when in use, the capillary chromatographic column 2 is inserted into the sleeve 1, and then the interface screw 3 of the capillary chromatographic column 2 is screwed with the internal thread of the sleeve 1, so that the connection between the capillary chromatographic column 2 and the sleeve 1 is realized, and the opening at the end of the sleeve 1 can be sealed by the interface screw 3, so as to avoid leakage of the carrier gas from the position and ensure that the carrier gas completely enters the thermal conductivity detector. Of course, in other embodiments, the first connection structure may also be a clamping structure disposed on the sleeve 1 and the capillary chromatographic column 2, for example, the sleeve 1 is disposed with a clamping groove, and the capillary chromatographic column 2 is disposed with an adaptive clamping table; the first connection structure may also be an elastic sealing ring provided on the casing 1, the elastic sealing ring being formed with an insertion hole adapted to insert the capillary column 2 to be sealingly connected with the capillary column 2 by elasticity.

In order to facilitate connection between the sleeve 1 and the thermal conductivity detector and avoid the influence of misalignment during detection on the detection result, preferably, as shown in fig. 1, the sleeve 1 is provided with a second connection structure for connecting the thermal conductivity detector, and one end of the sleeve 1, which is different from the end provided with the first connection structure, extends into the thermal conductivity detector. Of course, in other embodiments, the sleeve 1 may be directly inserted into the thermal conductivity detector without providing the second connection structure. Because the capillary chromatographic column 2 is positioned in the sleeve 1, the outlet end of the capillary chromatographic column 2 also extends into the thermal conductivity detector along with the sleeve 1, namely a tail blowing structure is formed, and thus the effect outside the column of the dead volume of the thermal conductivity detector can be eliminated.

The specific structure of the second connection structure is not limited in the present invention, and preferably, as in the embodiment shown in fig. 1, the second connection structure includes a union nut 4 disposed on the outer circumferential wall of the sleeve 1, and the union nut 4 is used for connecting the threaded interface of the thermal conductivity detector, of course, the union nut 4 may be disposed as an integral structure with the sleeve 1, or an external thread may be disposed on the outer wall of the sleeve 1 to threadedly connect the union nut 4.

In order to introduce the carrier gas into the gas channel, it is preferable that the tube wall of the sleeve 1 is provided with an inlet of the gas channel, as in the embodiment shown in fig. 1.

In order to avoid that the carrier gas flow introduced into the thermal conductivity detector by the gas path channel is too large, the shape and the measuring result of a chromatographic peak are influenced, and even the chromatographic peak cannot be detected, the connecting device further comprises a pressure stabilizing valve, and the pressure stabilizing valve is connected with the inlet of the gas path channel, so that the carrier gas flow entering the gas path channel is controlled, and the pressure stabilizing effect is realized.

In order to realize the connection between the pressure stabilizing valve and the gas path channel and avoid the influence on the detection result caused by dislocation or carrier gas leakage during detection, the connecting device further comprises a three-way pipe 5, wherein the three-way pipe 5 comprises a linear casing section with two openings and an interface section with one opening, the interface section is used for connecting the pressure stabilizing valve, and the casing section is sleeved on the casing 1 so as to communicate the interface section with the inlet of the gas path channel.

In order to realize the stable connection between the interface section and the pressure stabilizing valve and avoid the influence on the detection result caused by dislocation or carrier gas leakage during detection, the interface section is further provided with a switching valve 6 for connecting the pressure stabilizing valve, and the switching valve 6 is used for being in threaded connection with a port valve 7 of the pressure stabilizing valve.

The utility model also provides a detector, which comprises a capillary chromatographic column 2, a thermal conductivity detector and the connecting device, wherein the capillary chromatographic column 2 is connected with the thermal conductivity detector through the connecting device.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the utility model, numerous simple modifications can be made to the technical solution of the utility model, including combinations of the specific features in any suitable way, and the utility model will not be further described in relation to the various possible combinations in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.

Claims (10)

1. The utility model provides a connecting device for connect capillary chromatographic column (2) and thermal conductivity detector, its characterized in that, connecting device includes sleeve pipe (1), sleeve pipe (1) are used for the cover to establish outside capillary chromatographic column (2) and connect the thermal conductivity detector, sleeve pipe (1) with form gas passage between capillary chromatographic column (2), gas passage be used for with capillary chromatographic column (2) simultaneously to the thermal conductivity detector provides the carrier gas.

2. The connection arrangement according to claim 1, characterized in that the sleeve (1) is provided with a first connection structure at an end other than the end connected to the thermal conductivity detector for connection to a capillary chromatography column (2).

3. Connection device according to claim 2, characterized in that the first connection structure comprises an internal thread provided on the inner wall of the sleeve (1) for connecting an interface screw (3) of the capillary chromatography column (2).

4. A connection arrangement according to claim 2, characterised in that the sleeve (1) is provided with a second connection structure for connection to the thermal conductivity detector and that the end of the sleeve (1) other than the end provided with the first connection structure extends into the thermal conductivity detector.

5. The connection arrangement according to claim 4, characterized in that the second connection structure comprises a union nut (4) arranged on the outer circumferential wall of the sleeve (1), the union nut (4) being adapted to connect to a threaded interface of the thermal conductivity detector.

6. A connection device according to any of claims 1-5, characterized in that the wall of the casing (1) is provided with an inlet for an air passage channel.

7. The connecting device according to claim 6, further comprising a pressure maintaining valve connected to an inlet of the air passage channel.

8. The connection device according to claim 7, characterized in that the connection device further comprises a tee pipe (5), the tee pipe (5) comprises a straight casing section with two openings and an interface section with one opening, the interface section is used for connecting the pressure maintaining valve, and the casing section is sleeved on the casing (1) so as to enable the interface section to be communicated with the inlet of the gas path channel.

9. A connecting device according to claim 8, characterised in that the interface section is provided with a changeover valve (6) for connecting the pressure maintaining valve.

10. A detector, characterized by comprising a capillary chromatography column (2), a thermal conductivity detector and a connection means according to any of claims 1-9, the capillary chromatography column (2) being connected to the thermal conductivity detector via the connection means.

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