High pressure hand-tight metal fitting for liquid chromatograph

Abstract

This utility model belongs to the technical field of liquid chromatography, specifically relating to a high-pressure hand-tightening metal connector for liquid chromatographs. It includes a mounting block, with a fixed head fixedly connected inside the mounting block. Two connectors are inserted into the fixed head, symmetrically distributed within the fixed head. A fixed block is fixedly connected to the outside of the fixed head, and a limiting sleeve is rotatably connected to the outside of the fixed block. This utility model, by incorporating components such as a sealing ring, a sliding rod, and a spring, allows the sealing ring to engage with the connector when the connector is connected to the fixed head, effectively increasing the seal between them. This solves the problem of poor sealing and leakage at the connection point in traditional high-pressure hand-tightening metal connectors for liquid chromatographs.

Description

Technical Field

[0001] This utility model relates to the field of liquid chromatography technology, specifically a high-pressure hand-tightening metal connector for a liquid chromatograph. Background Technology

[0002] High-performance liquid chromatography (HPLC) is a highly efficient technique for separation, quantification, and qualitative analysis, widely used in chemistry, pharmaceuticals, biochemistry, environmental monitoring, and other fields. Its core function is to use a liquid phase as the mobile phase to separate components in a mixture through the interaction between the sample and the stationary phase within a chromatographic column. The high-pressure hand-tight metal connector (often simply called the high-pressure connector) is a crucial component in an HPLC system used to connect different pipes, columns, pumps, injectors, and other parts.

[0003] The liquid chromatograph disclosed in utility model patent publication number CN205982189U includes a storage tank, a high-pressure pump, an injector, a chromatographic column, a detector, a recorder, a waste bottle, and a power supply, and also includes a high-pressure pump start-stop protection device. The high-pressure pump start-stop protection device includes: a hydraulic sensor disposed in the liquid path between the high-pressure pump and the injector to detect the hydraulic pressure in the liquid path and generate a corresponding current detection signal; a comparison circuit coupled to the hydraulic sensor to receive the current detection signal and compare the current detection signal with a preset value to output a corresponding comparison signal based on the comparison result; a controllable switch connected in parallel with the power supply switch of the liquid chromatograph; and a switching circuit that controls the controllable switch to be on / off in response to the comparison signal.

[0004] However, the high-pressure hand-tightened metal connector of the liquid chromatograph has poor sealing effect after the connector and the fixed head are connected, which can easily lead to leakage at the connection. Utility Model Content

[0005] The purpose of this invention is to provide a high-pressure hand-tightening metal connector for a liquid chromatograph, which solves the problem of poor sealing effect after the connector and the fixed head are connected, which easily leads to leakage at the connection.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-pressure hand-tightening metal connector for a liquid chromatograph, comprising a mounting block, a fixing head fixedly connected inside the mounting block, a connector inserted inside the fixing head, two connectors symmetrically distributed inside the fixing head, a fixing block fixedly connected to the outside of the fixing head, a limiting sleeve rotatably connected to the outside of the fixing block, the limiting sleeve contacting the mounting block, and a sealing mechanism provided inside the fixing head.

[0007] Preferably, the limiting sleeve is rotatably connected to the fixing head, and the limiting sleeve is threadedly connected to the connecting head. The design of the limiting sleeve can limit the movement of the connecting head.

[0008] Preferably, the limiting sleeve has an annular groove inside, and a fixing block is slidably connected inside the annular groove. Through the design of the annular groove, it can cooperate with the fixing block to limit the limiting sleeve.

[0009] Preferably, the sealing mechanism includes a fixing plate, and the fixing plate is fixedly connected inside the fixing head. A sleeve is fixedly connected to one side of the fixing plate away from each other. A sliding rod is slidably connected inside the sleeve. A spring is provided inside the sleeve. A sealing ring is fixedly connected to the end of the sliding rod away from the sleeve. When the connector and the fixing head are inserted, the sealing ring will contact the sealing ring, causing the sealing ring to slide within the limiting ring. The sliding rod compresses the spring, and the spring force drives the sliding rod to move, causing the sliding rod to bring the sealing ring into contact with the connector, thereby effectively increasing the sealing performance between the fixing head and the connector.

[0010] Preferably, a limiting ring is fixedly connected inside the sleeve, and the limiting ring is slidably connected to the slide rod. Through the design of the limiting ring, the slide rod can be limited.

[0011] Preferably, one end of the spring contacts the slide rod, and the other end of the spring contacts the sleeve. Through the design of the spring, the sealing ring can be driven to fit against the connector.

[0012] Preferably, the sealing ring contacts the fixing head and the connecting head. The design of the sealing ring can increase the sealing performance between the connecting head and the fixing head.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model, by incorporating components such as a sealing ring, a sliding rod, and a spring, allows the sealing ring to fit against the connector when the connector and the fixed head are connected. This effectively increases the sealing performance between the connector and the fixed head, solving the problem of poor sealing performance and leakage at the connection point when the high-pressure hand-tightened metal connector of a liquid chromatograph is connected to the fixed head.

[0015] 2. By incorporating components such as a fixing block and a limiting sleeve, this utility model allows the connector to be connected to the fixing head. By rotating the limiting sleeve, the limiting sleeve and the connector undergo threaded movement, thereby limiting the connection between the connector and the fixing head and ensuring a stable connection. Attached Figure Description

[0016] Figure 1 This is a perspective view of the overall structure of this utility model;

[0017] Figure 2 For the present utility model Figure 1 A partial three-dimensional structural diagram;

[0018] Figure 3 For the present utility model Figure 1 A front sectional view;

[0019] Figure 4 For the present utility model Figure 3 Enlarged view of part A of the structure.

[0020] In the diagram: 1. Mounting block; 2. Fixing head; 3. Connecting head; 4. Fixing block; 41. Limiting sleeve; 42. Ring groove; 5. Sealing mechanism; 51. Fixing plate; 52. Sleeve; 53. Slide rod; 54. Limiting ring; 55. Spring; 56. Sealing ring. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-4 A high-pressure hand-tightened metal connector for a liquid chromatograph includes a mounting block 1. A fixing head 2 is fixedly connected inside the mounting block 1. A connector 3 is inserted into the fixing head 2. There are two connectors 3, which are symmetrically distributed inside the fixing head 2. A fixing block 4 is fixedly connected to the outside of the fixing head 2. A limiting sleeve 41 is rotatably connected to the outside of the fixing block 4. The limiting sleeve 41 contacts the mounting block 1 and is rotatably connected to the fixing head 2. The limiting sleeve 41 is threadedly connected to the connector 3. The limiting sleeve 41 is designed to limit the connector 3. An annular groove 42 is provided inside the limiting sleeve 41. The fixing block 4 is slidably connected inside the annular groove 42. The annular groove 42 is designed to cooperate with the fixing block 4 to limit the limiting sleeve 41. A sealing mechanism 5 is provided inside the fixing head 2.

[0023] Please see Figure 2-4The sealing mechanism 5 includes a fixing plate 51. The fixing plate 51 is fixedly connected inside the fixing head 2. A sleeve 52 is fixedly connected to the side of the fixing plate 51 that is away from each other. A slide rod 53 is slidably connected inside the sleeve 52. A limit ring 54 is fixedly connected inside the sleeve 52. The limit ring 54 is slidably connected to the slide rod 53. The design of the limit ring 54 can limit the slide rod 53. A spring 55 is provided inside the sleeve 52. One end of the spring 55 contacts the slide rod 53, and the other end of the spring 55 contacts the sleeve 52. The design of the spring 55 can drive the sealing ring 56 to fit against the connector 3. The sealing ring 56 is fixedly connected to the end of the slide rod 53 that is away from the sleeve 52.

[0024] Please see Figure 2-4 The sealing ring 56 contacts the fixing head 2 and the connecting head 3. The design of the sealing ring 56 can increase the sealing between the connecting head 3 and the fixing head 2. When the connecting head 3 is inserted into the fixing head 2, it will contact the sealing ring 56, causing the sealing ring 56 to drive the slide rod 53 to slide within the limiting ring 54. The slide rod 53 compresses the spring 55, and the elastic force of the spring 55 drives the slide rod 53 to move, so that the slide rod 53 drives the sealing ring 56 to fit with the connecting head 3, thereby effectively increasing the sealing between the fixing head 2 and the connecting head 3.

[0025] The specific implementation process of this utility model is as follows: When in use, the connector 3 is inserted into the fixing head 2, and then the limiting sleeve 41 is rotated so that the limiting sleeve 41 rotates on the fixing block 4, so that the limiting sleeve 41 and the connector 3 have a threaded movement, thereby the limiting sleeve 41 plays a limiting role on the connector 3, so that the connection between the connector 3 and the fixing head 2 can be kept stable.

[0026] When the connector 3 is inserted into the fixing head 2, it will contact the sealing ring 56, causing the sealing ring 56 to drive the slide rod 53 to slide within the limiting ring 54. The slide rod 53 compresses the spring 55, and the elastic force of the spring 55 drives the slide rod 53 to move, so that the slide rod 53 drives the sealing ring 56 to fit with the connector 3, thereby effectively increasing the sealing between the fixing head 2 and the connector 3.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-pressure hand-tightening metal connector for a liquid chromatograph, comprising a mounting block (1), characterized in that: The mounting block (1) is fixedly connected to a fixing head (2), and a connector (3) is inserted into the fixing head (2). There are two connectors (3), which are symmetrically distributed inside the fixing head (2). A fixing block (4) is fixedly connected to the outside of the fixing head (2). A limiting sleeve (41) is rotatably connected to the outside of the fixing block (4). The limiting sleeve (41) contacts the mounting block (1). A sealing mechanism (5) is provided inside the fixing head (2).

2. The high-pressure hand-tightening metal connector for a liquid chromatograph according to claim 1, characterized in that: The limiting sleeve (41) is rotatably connected to the fixing head (2), and the limiting sleeve (41) is threadedly connected to the connecting head (3).

3. The high-pressure hand-tightening metal connector for a liquid chromatograph according to claim 1, characterized in that: The limiting sleeve (41) has an annular groove (42) inside, and a fixing block (4) is slidably connected inside the annular groove (42).

4. The high-pressure hand-tightening metal connector for a liquid chromatograph according to claim 1, characterized in that: The sealing mechanism (5) includes a fixing plate (51), the fixing plate (51) is fixedly connected inside the fixing head (2), a sleeve (52) is fixedly connected to the side of the fixing plate (51) that is far away from each other, a slide rod (53) is slidably connected inside the sleeve (52), a spring (55) is provided inside the sleeve (52), and a sealing ring (56) is fixedly connected to the end of the slide rod (53) that is far away from the sleeve (52).

5. A high-pressure hand-tightening metal connector for a liquid chromatograph according to claim 4, characterized in that: The sleeve (52) is fixedly connected to a limiting ring (54), and the limiting ring (54) is slidably connected to the slide rod (53).

6. The high-pressure hand-tightening metal connector for a liquid chromatograph according to claim 4, characterized in that: One end of the spring (55) is in contact with the slide bar (53), and the other end of the spring (55) is in contact with the sleeve (52).

7. The high-pressure hand-tightening metal connector for a liquid chromatograph according to claim 4, characterized in that: The sealing ring (56) contacts the fixing head (2) and the sealing ring (56) contacts the connecting head (3).

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