Sealing structure

Abstract

The utility model provides a sealing structure which comprises a connecting nut, a graphite pressing ring and an abutting backing ring, the graphite pressing ring is fixedly arranged in the connecting nut and is provided with an abutting end used for abutting against and sealing a sample injection port, and the abutting backing ring is coaxially embedded in the abutting end of the sample injection port and is flush with the abutting end in the radial direction. The connecting nut is in threaded connection with the sample injection port, the abutting end, located in the connecting nut, of the graphite pressing ring is used for abutting against the sample injection port immediately, and the abutting backing ring located at the abutting end is used for blocking a port channel of the sample injection port. The situation that graphite chippings generated in the abutting process of the graphite pressing ring enter the analysis equipment through the sample injection channel, and then the detection result and the maintenance cost of the analysis equipment are affected is avoided, and the abutting end part avoids the extension part of the abutting backing ring and still can surround and abut against the port side wall part of the sample injection port; therefore, the sealing effect on the sample injection port is achieved.

Description

Technical Field

[0001] This application belongs to the technical field of gas chromatography equipment, and more specifically, relates to a sealing structure. Background Art

[0002] During the use of analytical equipment such as gas chromatography and gas chromatography-mass spectrometry, external carrier gas needs to enter the equipment interior after passing through a capillary chromatographic column and being connected to the injection port of the analytical equipment. When the capillary chromatographic column is connected to the injection port of the analytical equipment, currently, the injection port is mainly sealed by the cooperation of a connecting nut and a graphite compression ring (where the graphite compression ring is used to abut and seal the injection port) to prevent carrier gas leakage. However, during the process of the graphite compression ring abutting against the injection port, due to its own structural characteristics, graphite debris is easily generated and enters the injection port, and then continues to enter the analytical equipment interior through the injection port, ultimately affecting the detection results and maintenance costs of the analytical equipment. Summary of the Utility Model

[0003] The purpose of this application is to provide a sealing structure, aiming to solve the problem that during the process of the current graphite compression ring abutting against the injection port of analytical equipment such as gas chromatography and gas chromatography-mass spectrometry, due to its own structural characteristics, graphite debris is easily generated and enters the injection port, and then continues to enter the analytical equipment interior through the injection port, ultimately affecting the detection results and maintenance costs of the equipment.

[0004] To achieve the above purpose, the technical solution adopted in this application is to provide a sealing structure for sealing an injection port, including a connecting nut, a graphite compression ring, and an abutting cushion ring. The outer periphery of the injection port has a first thread, and the inner periphery of the connecting nut has a second thread adapted to the first thread to form a threaded connection. The graphite compression ring is fixedly arranged inside the connecting nut and has an abutting end for abutting and sealing the injection port. The abutting cushion ring is coaxially embedded on the abutting end of the graphite compression ring and is flush with the abutting end in the radial direction. The outer diameter of the cushion ring of the abutting cushion ring is larger than the inner diameter of the port of the injection port and smaller than the outer diameter of the port of the injection port. The outer diameter of the end of the abutting end is larger than the outer diameter of the cushion ring of the abutting cushion ring and smaller than or equal to the outer diameter of the port of the injection port.

[0005] In one of the embodiments, an annular groove is coaxially provided at the abutting end of the graphite compression ring, and a plurality of positioning slot holes are evenly provided along the circumferential direction of the annular groove. A plurality of positioning protrusions are evenly provided along the circumferential direction of the abutting cushion ring. The abutting cushion ring is arranged in the annular groove, and each positioning protrusion penetrates through each positioning slot hole in a one-to-one correspondence.

[0006] In one of the embodiments, the inner circumference of the connecting nut has a cylindrical region and a conical region that are adjacent and connected in the axial direction, the outer diameter of the conical region gradually decreases in the axial direction away from the cylindrical region, the graphite pressure ring has a cylindrical body and a conical body that are adjacent and connected in the axial direction, the outer diameter of the conical body gradually decreases in the axial direction away from the cylindrical body, the cylindrical body is correspondingly adapted to be penetrated in the cylindrical region, the conical body is correspondingly adapted to be penetrated in the conical region, and abuts the conical region in the axial direction away from the cylindrical region, the second thread is arranged on the inner wall of the cylindrical region, and the abutting end is arranged at one end of the cylindrical body away from the conical body.

[0007] In one embodiment, the abutment gasket is a metal gasket.

[0008] In one embodiment, the outer diameter of the abutting gasket is 1.02 mm, the outer diameter of the abutting end is 3.14 mm, the inner diameter of the injection port is less than 1.02 mm, and the outer diameter of the injection port is greater than or equal to 3.14 mm.

[0009] The sealing structure provided by the present application has the beneficial effect that, compared with the prior art, the sealing structure comprises a connecting nut, a graphite pressure ring and an abutting gasket, wherein the graphite pressure ring is fixedly arranged in the connecting nut and has an abutting end portion for abutting and sealing the injection port, the abutting gasket is coaxially embedded in the abutting end portion of the injection port and is flush with the abutting end portion in the radial direction, and the outer diameter of the abutting gasket is larger than the inner diameter of the injection port and smaller than the outer diameter of the injection port, and the outer diameter of the end portion of the abutting end portion is larger than the outer diameter of the gasket of the abutting gasket and is smaller than or equal to the outer diameter of the port of the injection port. In this way, it is threadedly connected to the injection port through the connecting nut, and the abutting end of the graphite pressure ring located inside the connecting nut is used to abut the injection port, wherein the abutting gasket located at the abutting end is used to block the port channel of the injection port, thereby preventing graphite debris generated by the graphite pressure ring during the abutting process from entering the interior of the analysis device through the injection channel, thereby affecting the detection results and maintenance costs of the analysis device, and the abutting end is avoided at the extension part of the abutting gasket and can still surround and abut the port side wall part of the injection port, thereby playing a sealing role on the injection port. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0011] Figure 1 It is a schematic diagram of the main structure of the injection port of an analytical device such as a gas chromatograph or a gas chromatography-mass spectrometer;

[0012] Figure 2 is Figure 1 The top - view structural schematic diagram of the injection port shown;

[0013] Figure 3 is the cross - sectional structural schematic diagram of the sealing structure provided by an embodiment of the present application;

[0014] Figure 4 is Figure 3 The front - view structural schematic diagram of the graphite compression ring in the sealing structure shown;

[0015] Figure 5 is Figure 3 The bottom - view structural schematic diagram of the graphite compression ring and the abutting gasket ring in the sealing structure shown;

[0016] Figure 6 is Figure 3 The bottom - view structural schematic diagram of the graphite compression ring in the sealing structure shown;

[0017] Figure 7 is Figure 3 The top - view structural schematic diagram of the abutting gasket ring in the sealing structure shown.

[0018] In the figure: 10, injection port; 11, port channel; 12, port side wall; 20, sealing structure; 100, connecting nut; 110, cylindrical region; 120, conical region; 200, graphite compression ring; 210, cylindrical main body; 220, conical main body; 211, abutting end; 212, annular groove; 213, positioning slot hole; 300, abutting gasket ring; 303, positioning protrusion. Detailed implementation manners

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0020] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0021] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0022] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0023] Please refer jointly to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 to illustrate a sealing structure 20 provided in an embodiment of the present application. The above-mentioned sealing structure 20 is applicable to sealing the injection port 10 of analytical devices such as gas chromatography and gas chromatography-mass spectrometry (not shown in the figure). The injection port 10 is composed of an annular port sidewall 12. The port sidewall 12 encloses to form a port channel 11 and then communicates with the corresponding analytical device. The sealing structure 20 includes a connecting nut 100, a graphite compression ring 200, and a contact pad ring 300. Among them, the outer periphery of the port sidewall 12 of the injection port 10 has a first thread (not shown in the figure), and the inner periphery of the connecting nut 100 has a second thread (not shown in the figure) adapted to the first thread to form a threaded connection fit. The graphite compression ring 200 is fixedly arranged in the connecting nut 100 and has a contact end 211 for contacting and sealing the corresponding end of the injection port 10. The contact pad ring 300 is coaxially embedded on the contact end 211 of the graphite compression ring 200 and is flush with the contact end 211 in the radial direction. Moreover, the outer diameter d1 of the pad ring of the contact pad ring 300 is greater than the inner diameter d4 of the injection port 10 and less than the outer diameter d5 of the injection port 10. The outer diameter d2 of the end of the contact end 211 is greater than the outer diameter d1 of the pad ring of the contact pad ring 300 and less than or equal to the outer diameter d5 of the injection port 10.

[0024] The sealing structure 20 provided by the present application has the beneficial effect that, compared with the prior art, the sealing structure 20 is provided with an abutting gasket 300 on the abutting end portion 211 of the graphite pressure ring 200, and the gasket outer diameter d1 of the abutting gasket 300 is greater than the port inner diameter d4 of the injection port 10 and smaller than the port outer diameter d5 of the injection port 10, and the end outer diameter d2 of the abutting end portion 211 is greater than the gasket outer diameter d1 of the abutting gasket 300 and smaller than or equal to the port outer diameter d5 of the injection port 10, so that the sealing structure 20 is threadedly connected to the injection port 10 through the connecting nut 100, and is located at the connecting nut 100. 00, the abutting end portion 211 of the graphite pressure ring 200 inside is then used to abut the injection port 10, wherein the abutting gasket ring 300 located at the abutting end portion 211 is used to block the port channel 11 of the injection port 10, thereby preventing graphite debris generated by the graphite pressure ring 200 during the abutting process from entering the interior of the analysis device through the port channel 11, thereby affecting the detection results and maintenance costs of the analysis device, while the abutting end portion 211 avoids the extension of the abutting gasket ring 300 and can still surround and abut the port side wall 12 of the injection port 10, thereby playing a sealing role on the injection port 10.

[0025] Please also read Figure 3 and Figure 4 In the present embodiment, the inner circumference of the connecting nut 100 has a cylindrical region 110 and a conical region 120 adjacent to each other and connected along its own circumferential direction, and the outer diameter of the conical region 120 gradually decreases along the axial direction away from the cylindrical region 110, and the graphite pressure ring 200 has a cylindrical body 210 and a conical body 220 adjacent to each other and connected along its own axial direction, and the outer diameter of the conical body 220 gradually decreases along the axial direction away from the cylindrical body 210, wherein the cylindrical body 210 is correspondingly adapted to be penetrated in the cylindrical region 110, and the conical body 220 is correspondingly adapted to be penetrated in the conical region 120, and the conical body 220 abuts against the conical region 120 along the axial direction away from the cylindrical body 210, and the second thread is arranged on the inner wall of the cylindrical region 110, and the abutting end portion 211 is arranged at one end portion of the cylindrical body 210 away from the conical body 220.

[0026] Please also read Figure 6 and Figure 7 In the present embodiment, the abutting end portion 211 of the graphite pressure ring 200 is coaxially provided with an annular groove 212, and the annular groove 212 is evenly provided with a plurality of positioning slots 213 along its own circumference. The abutting gasket ring 300 is evenly provided with a plurality of positioning protrusions 303 along its own circumference on one side facing the abutting end portion 211. The abutting gasket ring 300 is arranged in the annular groove 212, and each positioning protrusion 303 is correspondingly penetrated and fixed in each positioning slot 213.

[0027] Further, in this embodiment, the abutting gasket ring 300 is a metal gasket ring. The outer diameter d1 of the gasket ring of the abutting gasket ring 300 is 1.02 mm, the outer diameter of the end portion of the abutting end portion 211 is 3.14 mm, the inner diameter d4 of the port of the sample injection port 10 is less than 1.02 mm, the outer diameter d5 of the port of the sample injection port 10 is greater than or equal to 3.14 mm, the inner diameter d3 of the gasket ring of the abutting gasket ring 300 and the inner diameter d3 of the end portion of the abutting end portion 211 are 0.25 mm, the length of the cylindrical main body 210 along its own axial direction is 2.96 mm, the length of the conical main body 220 along its own axial direction is 0.72 mm, and the outer diameter of the end portion of the conical main body 220 along the axial direction away from the cylindrical main body 210 is 2.65 mm; it should be understood that the inner diameter d3 of the gasket ring of the abutting gasket ring 300 and the inner diameter d3 of the end portion of the abutting end portion 211 are determined by the outer diameter size of the corresponding capillary column (not shown in the figure). In some other embodiments, d3 is 0.32 mm or 0.53 mm (the outer diameter size of the corresponding capillary column is 0.32 mm or 0.53 mm).

[0028] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A sealing structure for sealing a sample injection port, characterized in that, It includes a connecting nut, a graphite compression ring and an abutting gasket ring. The outer periphery of the sample injection port has a first thread, and the inner periphery of the connecting nut has a second thread adapted to the first thread to form a threaded connection fit. The graphite compression ring is fixedly arranged in the connecting nut and has an abutting end for abutting and sealing the sample injection port. The abutting gasket ring is coaxially embedded on the abutting end of the graphite compression ring and is flush with the abutting end in the radial direction. The outer diameter of the gasket ring of the abutting gasket ring is larger than the inner diameter of the port of the sample injection port and smaller than the outer diameter of the port of the sample injection port. The outer diameter of the end of the abutting end is larger than the outer diameter of the gasket ring of the abutting gasket ring and smaller than or equal to the outer diameter of the port of the sample injection port.

2. The sealing structure according to claim 1, characterized in that, An annular groove is coaxially arranged at the abutting end of the graphite compression ring, and a plurality of positioning holes are uniformly arranged along the circumferential direction of the annular groove. A plurality of positioning protrusions are uniformly arranged along the circumferential direction of the abutting gasket ring. The abutting gasket ring is arranged in the annular groove, and each positioning protrusion penetrates through each positioning hole in a one-to-one correspondence.

3. The sealing structure according to claim 1, characterized in that, The inner periphery of the connecting nut has a cylindrical area and a conical area that are axially adjacent and communicate with each other. The outer diameter of the conical area gradually decreases along the axial direction away from the cylindrical area. The graphite compression ring has a cylindrical main body and a conical main body that are axially adjacent and connected. The outer diameter of the conical main body gradually decreases along the axial direction away from the cylindrical main body. The cylindrical main body is correspondingly adapted to penetrate through the cylindrical area, and the conical main body is correspondingly adapted to penetrate through the conical area and abuts against the conical area along the axial direction away from the cylindrical area. The second thread is arranged on the inner wall of the cylindrical area, and the abutting end is arranged at one end of the cylindrical main body away from the conical main body.

4. The sealing structure according to claim 1, wherein, The abutting gasket ring is a metal gasket ring.

5. The sealing structure according to any one of claims 1 to 4, characterized in that The outer diameter of the gasket ring of the abutting gasket ring is 1.02 mm, the outer diameter of the end of the abutting end is 3.14 mm, the inner diameter of the port of the sample injection port is less than 1.02 mm, and the outer diameter of the port of the sample injection port is greater than or equal to 3.14 mm.

Images