Liquid chromatography pump pressure sensor structure

Abstract

The utility model discloses a liquid chromatography pump pressure sensor structure which comprises a pipe body and a pump head outlet pipe, and a connecting assembly used for connecting the pump head outlet pipe with the pipe body is installed at the end of the pipe body. The connecting assembly comprises two fixing discs, a rotating locking ring, a connecting disc, a limiting ring and a connecting pipe. The two fixing discs are symmetrically and fixedly connected to the two ends of the pipe body, the rotating locking rings are rotationally connected to the outer portions of the fixing discs through bearings, and four limiting bases are symmetrically and fixedly connected to the inner walls of the rotating locking rings. According to the utility model, when the main body structure of the sensor is disassembled, no tool is needed, the connection or disassembly operation can be completed only through three actions of alignment, push-in and rotation, and the time for replacing or maintaining the sensor is shortened from several minutes to tens of seconds, so that the working efficiency and the usability of a chromatographic system are greatly improved; and the axial pressing force generated by mechanical locking is huge and uniform, so that the leakage risk of a liquid chromatography system under high pressure is avoided.

Description

Technical Field

[0001] This utility model relates to a pressure sensor structure, specifically a pressure sensor structure for a liquid chromatography pump, and belongs to the field of pressure sensor technology. Background Technology

[0002] The pressure sensor of a liquid chromatography (LC) pump is a key component in a LC system used for real-time monitoring of the pump's output pressure. It is typically integrated into critical nodes in the pump's flow path (such as the pump outlet or the front end of the injection valve). It converts the liquid pressure signal within the flow path into an electrical signal that can be recognized by the instrument control system through principles such as piezoelectricity and strain resistance. Its core function is to track changes in flow path pressure in real time, making it an indispensable component for maintaining the normal operation of the LC system and improving experimental reliability. LC pump pressure sensors often require periodic calibration to ensure pressure monitoring accuracy.

[0003] In the periodic calibration of pressure sensors for liquid chromatography pumps, the operation process of traditional fixed sensors is obviously cumbersome, causing many inconveniences to laboratory operation and maintenance. Disassembly and installation must be carried out using a wrench of the same specification, which is not only complicated but also time-consuming, thus affecting the daily testing efficiency of the laboratory. Especially in emergency sample testing scenarios, the time spent on sensor calibration can directly disrupt the daily testing rhythm of the laboratory. To address this, a new structure for a liquid chromatography pump pressure sensor is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a liquid chromatography pump pressure sensor structure to solve one of the problems mentioned in the background art.

[0005] This utility model is implemented by the following technical solution: a liquid chromatography pump pressure sensor structure, including a tube body and a pump head outlet tube, wherein a connecting component for connecting the pump head outlet tube to the tube body is installed at the end of the tube body;

[0006] The connecting assembly includes two fixed discs, a rotating locking ring, a connecting disc, a limiting ring, and a connecting tube;

[0007] Two fixed discs are symmetrically fixedly connected to both ends of the tube body. The rotating locking ring is rotatably connected to the outside of the fixed discs through bearings. Four limiting seats are symmetrically fixedly connected to the inner wall of the rotating locking ring. The outer wall of the connecting disc is symmetrically provided with grooves that match the size of the limiting seats. The limiting ring is fixedly connected to one side of the connecting disc, and the outer wall of the limiting ring is provided with anti-slip particles. The connecting tube is fixedly connected to one side of the connecting disc.

[0008] As a further preferred embodiment of this technical solution: one end of the limiting ring is close to the groove, and the thickness of the end of the limiting ring away from the groove gradually increases.

[0009] As a further preferred embodiment of this technical solution: a first sealing ring is embedded on the side of the connecting plate away from the connecting pipe, and the connecting plate is in contact with the fixed plate through the first sealing ring.

[0010] As a further preferred embodiment of this technical solution: the limiting seat is located outside the limiting ring and is in contact with the anti-slip particles.

[0011] As a further preferred embodiment of this technical solution: a second sealing ring is embedded in the outer wall of the connecting pipe.

[0012] As a further preferred embodiment of this technical solution: the pump head outlet pipe is sleeved on the outer wall of the connecting pipe and sealed by the second sealing ring, and the pump head outlet pipe is fixed to the connecting pipe by a clamp.

[0013] As a further preferred embodiment of this technical solution: the outer wall of the tube is provided with a mounting seat that communicates with it.

[0014] As a further preferred embodiment of this technical solution: a detection probe is installed inside the mounting base, and the detection end of the detection probe is located inside the tube.

[0015] Advantages of this utility model:

[0016] 1. When disassembling the sensor, rotate the locking ring counterclockwise. Rotating the locking ring will cause the limiting seat to move closer to the thin end of the limiting ring and rotate it until it is aligned with the corresponding groove. Then pull the locking ring to disengage the limiting seat from the groove. At this time, the connecting plate and the fixed plate will separate, and the disassembly of the main structure of the sensor can be completed for calibration, replacement or repair.

[0017] 2. When disassembling the main structure of the sensor, this utility model requires no tools and only three actions of "alignment-push-rotation" to complete the connection or disassembly operation, which reduces the time for replacing or maintaining the sensor from several minutes to tens of seconds, greatly improving the working efficiency and availability of the chromatography system. Moreover, the axial clamping force generated by the mechanical locking is huge and uniform, eliminating the risk of leakage under high pressure in the liquid chromatography system. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram showing the installation position of the detection probe of this utility model;

[0021] Figure 3 This is an exploded view of the connecting component structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the connecting disc structure of this utility model.

[0023] In the diagram: 101, connecting assembly; 11, fixed plate; 13, limiting seat; 14, rotating locking ring; 15, connecting plate; 16, groove; 17, first sealing ring; 18, limiting ring; 19, anti-slip particles; 20, second sealing ring; 21, connecting pipe; 31, pipe body; 32, mounting base; 33, detection probe; 34, pump head outlet pipe. Detailed Implementation

[0024] 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.

[0025] Example

[0026] Please see Figures 1-4 The present invention provides a technical solution: a liquid chromatography pump pressure sensor structure, including a tube body 31 and a pump head outlet pipe 34, wherein a connecting component 101 for connecting the pump head outlet pipe 34 to the tube body 31 is installed at the end of the tube body 31.

[0027] The connecting assembly 101 includes two fixed discs 11, a rotating locking ring 14, a connecting disc 15, a limiting ring 18, and a connecting tube 21;

[0028] Two fixed plates 11 are symmetrically fixed to both ends of the tube body 31 and can be fixed by welding, serving as the static foundation of the entire connection structure;

[0029] The rotating locking ring 14 is rotatably connected to the outside of the fixed plate 11 via a bearing. Four limit seats 13 are symmetrically fixed to the inner wall of the rotating locking ring 14. By rotating the locking ring 14, the connection plate 15 and the fixed plate 11 can be connected or disassembled, thereby realizing the quick assembly and disassembly of the sensor body.

[0030] The outer wall of the rotating locking ring 14 is provided with anti-slip texture (not shown in the figure), which can increase friction and prevent slippage during rotation;

[0031] The outer wall of the connecting plate 15 is symmetrically provided with grooves 16 that match the size of the limiting seat 13. The limiting ring 18 is fixedly connected to one side of the connecting plate 15. One end of the limiting ring 18 is close to the groove 16, and the thickness of the end of the limiting ring 18 away from the groove 16 gradually increases.

[0032] During the connection process between the connecting plate 15 and the fixed plate 11, the limiting seat 13 inside the rotating locking ring 14 is first passed through the groove 16, and then the locking ring 14 is rotated clockwise. At this time, the rotating locking ring 14 drives the limiting seat 13 to contact the limiting ring 18.

[0033] During the rotation, as the thickness of the limiting ring 18 gradually increases, the limiting seat 13 moves along the surface trajectory of the limiting ring 18. Therefore, the limiting seat 13 gradually moves away from the connecting plate 15 in the axial direction. When the limiting seat 13 moves, it drives the rotating locking ring 14, thereby making the fixed plate 11 and the connecting plate 15 fit tightly together, thus completing the installation of the sensor main structure.

[0034] The outer wall of the limiting ring 18 is provided with anti-slip particles 19, and the limiting seat 13 is located outside the limiting ring 18 and is in contact with the anti-slip particles 19.

[0035] In addition, since the limiting ring 18 is provided with anti-slip particles 19, when the rotating locking ring 14 is loosened, the limiting seat 13 will not slip or reverse, thus ensuring the stability of the connection.

[0036] The connecting pipe 21 is fixedly connected to one side of the connecting plate 15. The first sealing ring 17 is embedded on the side of the connecting plate 15 away from the connecting pipe 21, and the connecting plate 15 is in contact with the fixed plate 11 through the first sealing ring 17. The first sealing ring 17 is used to form the main sealing surface on the end face after the connecting plate 15 and the fixed plate 11 are locked. There are two first sealing rings 17, which are the key static seals that can withstand the highest pressure of the system.

[0037] In this embodiment, specifically: a second sealing ring 20 is embedded in the outer wall of the connecting pipe 21, the pump head outlet pipe 34 is sleeved on the outer wall of the connecting pipe 21 and sealed by the second sealing ring 20, and the pump head outlet pipe 34 is fixed on the connecting pipe 21 by a clamp; the second sealing ring 20 is used to form a secondary seal between the outer walls of the connecting pipe 21 and the pump head outlet pipe 34.

[0038] Both the first sealing ring 17 and the second sealing ring 20 are made of fluororubber.

[0039] In this embodiment, specifically: the outer wall of the tube body 31 is provided with a mounting base 32 connected thereto, and a detection probe 33 is installed inside the mounting base 32. The detection end of the detection probe 33 is located inside the tube body 31. The mounting base 32 is connected to the outer wall of the tube body 31 and is integrally processed to form a chamber for installing the detection probe 33, so as to install the detection probe 33.

[0040] The detection probe 33 can directly and in real time sense the fluid pressure in the flow path and transmit the signal.

[0041] The detection probe 33 is a strain gauge pressure sensor probe with a signal of NTJP-1. Therefore, the detection probe 33 is existing technology, and its internal structure, working principle and connection control method will not be described in detail.

[0042] In terms of working principle or structural principle, during use, first connect the connecting pipe 21 to the pump head outlet pipe 34 of the liquid chromatography pump, insert the connecting pipe 21 into the pump head outlet pipe 34, and then use the clamp to lock and fix it. Then, connect the pump head outlet pipe 34 to the sensor body through the connecting assembly 101.

[0043] The limiting seat 13 inside the rotating locking ring 14 passes through the groove 16, and then the locking ring 14 is rotated clockwise. The rotating locking ring 14 causes the limiting seat 13 to contact the limiting ring 18. As the thickness of the limiting ring 18 gradually increases, the limiting seat 13 gradually moves away from the connecting plate 15 in the axial direction. The limiting seat 13 drives the fixed plate 11 through the rotating locking ring 14, thereby making the fixed plate 11 tightly fit with the connecting plate 15 through the first sealing ring 17, thus completing the installation of the sensor main structure.

[0044] When the sensor is working, it can directly and in real time sense the fluid pressure in the flow path through the detection probe 33 and transmit the signal.

[0045] When the sensor needs to be calibrated, replaced, or repaired, the sensor is disassembled. At this time, the locking ring 14 is rotated counterclockwise. Rotating the locking ring 14 causes the limiting seat 13 to move closer to the thin end of the limiting ring 18 and rotate it until it is aligned with the corresponding groove 16. Then, the locking ring 14 is pulled to disengage the limiting seat 13 from the groove 16. At this time, the connecting plate 15 is separated from the fixing plate 11. Similarly, the above operation is performed on the other end of the sensor to complete the disassembly of the main structure of the sensor for calibration, replacement, or repair.

[0046] Compared with existing technologies, this invention requires no tools when disassembling the main structure of the sensor. The connection or disassembly operation can be completed with only three actions: "alignment-push-rotation". This reduces the time for replacing or maintaining the sensor from several minutes to tens of seconds, greatly improving the working efficiency and availability of the chromatography system. Moreover, the mechanical locking generates a huge and uniform axial clamping force, eliminating the risk of leakage under high pressure in the liquid chromatography system.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pressure sensor structure for a liquid chromatography pump, characterized in that, It includes a pipe body (31) and a pump head outlet pipe (34), and the end of the pipe body (31) is equipped with a connecting assembly (101) for connecting the pump head outlet pipe (34) to the pipe body (31). The connecting assembly (101) includes two fixed discs (11), a rotating locking ring (14), a connecting disc (15), a limiting ring (18), and a connecting tube (21). Two fixed discs (11) are symmetrically fixed to both ends of the tube body (31). The rotating locking ring (14) is rotatably connected to the outside of the fixed disc (11) through a bearing. Four limiting seats (13) are symmetrically fixed to the inner wall of the rotating locking ring (14). The outer wall of the connecting disc (15) is symmetrically provided with grooves (16) that match the size of the limiting seats (13). The limiting ring (18) is fixedly connected to one side of the connecting disc (15), and the outer wall of the limiting ring (18) is provided with anti-slip particles (19). The connecting tube (21) is fixedly connected to one side of the connecting disc (15).

2. The liquid chromatography pump pressure sensor structure according to claim 1, characterized in that, One end of the limiting ring (18) is close to the groove (16), and the thickness of the end of the limiting ring (18) away from the groove (16) gradually increases.

3. The liquid chromatography pump pressure sensor structure according to claim 2, characterized in that, The first sealing ring (17) is embedded on the side of the connecting plate (15) away from the connecting tube (21), and the connecting plate (15) is attached to the fixed plate (11) through the first sealing ring (17).

4. The liquid chromatography pump pressure sensor structure according to claim 3, characterized in that, The limiting seat (13) is located outside the limiting ring (18) and is in contact with the anti-slip particles (19).

5. The liquid chromatography pump pressure sensor structure according to claim 1, characterized in that, The outer wall of the connecting pipe (21) is fitted with a second sealing ring (20).

6. The liquid chromatography pump pressure sensor structure according to claim 5, characterized in that, The pump head outlet pipe (34) is sleeved on the outer wall of the connecting pipe (21) and sealed by the second sealing ring (20), and the pump head outlet pipe (34) is fixed on the connecting pipe (21) by a clamp.

7. The liquid chromatography pump pressure sensor structure according to claim 1, characterized in that, The outer wall of the tube (31) is provided with a mounting seat (32) that is connected to it.

8. The liquid chromatography pump pressure sensor structure according to claim 7, characterized in that, The mounting base (32) is equipped with a detection probe (33), and the detection end of the detection probe (33) is located inside the tube (31).

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