Intelligent constant flow liquid chromatography pump

Abstract

This utility model discloses an intelligent steady-flow liquid chromatography pump, specifically relating to the field of liquid chromatography pump technology. It includes a front pump body, a rear pump body located on one side of the front pump body, a pump head located on one side of the rear pump body, a controller located on the top of the front pump body, a plunger connected to the output end of the front pump body, a detector located at the outlet pipe of the pump head, and a sealing chamber and a pump chamber respectively opened on opposite sides of the rear pump body and the pump head. This utility model first detects the output liquid rate using the detector. When the output liquid rate decreases, the controller can adjust the speed of the motor inside the front pump body for ease of use, thereby maintaining a stable liquid flow rate and achieving intelligent steady-flow. The rear pump body and the housing are connected by long bolts, allowing for easy disassembly, exposing one end of the sealing column for easy maintenance or replacement by rotating the sealing column to separate it from the plunger, thus improving the performance.

Description

Technical Field

[0001] This utility model relates to the field of liquid chromatography pump technology, and more specifically, to an intelligent steady-flow liquid chromatography pump. Background Technology

[0002] Liquid chromatography is a separation and analysis technique characterized by using a liquid as the mobile phase. The stationary phase can take various forms, such as paper, thin plates, and packed beds. The function of the liquid chromatography pump in a liquid chromatograph is to achieve high-pressure constant-flow liquid delivery, using the mobile phase as the carrier liquid to transport the sample for detection and analysis. The curved stroke of the cam used to realize the reciprocating motion of the plunger rod and the phase difference between the main and auxiliary cams can directly affect the pressure fluctuations in the high-pressure zone and pressure compensation. During the movement of the main and auxiliary cams, they work with the one-way valve to achieve the one-way liquid delivery function. The adjustable mechanism of its conveyor belt drive stably limits its tension, and the stable tension directly affects the stability of the entire drive.

[0003] Traditional liquid chromatography pumps, due to the reciprocating movement of the plunger during operation, will experience wear and tear over time, leading to poor sealing, pressure fluctuations, and changes in the resistance of the delivery pipeline. This results in an inability to guarantee a stable flow output. The unstable flow rate causes inconsistent migration speed of the sample in the chromatographic column, resulting in peak broadening and tailing, which seriously affects the resolution and accuracy of quantitative analysis. Furthermore, after wear, disassembly, repair, or replacement is inconvenient. Therefore, an intelligent steady-flow liquid chromatography pump is proposed. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides an intelligent steady-flow liquid chromatography pump to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an intelligent steady-flow liquid chromatography pump, comprising a front pump body, a rear pump body disposed on one side of the front pump body, a pump head disposed on one side of the rear pump body, a controller disposed on the top of the front pump body for convenient control, a plunger connected to the output end of the front pump body, and a detector disposed at the position of the outlet pipe of the pump head for detecting the rate of liquid output, thereby facilitating control of the starting rate of the motor in the middle of the front pump body via the controller for convenient control and adjustment.

[0006] A sealing cavity and a pump cavity are respectively provided on the opposite side of the rear pump body and the pump head. A limiting groove is provided in the inner cavity of the sealing cavity and on the side of the rear pump body near the front pump body. A second sealing ring is provided in the middle of the limiting groove. The plunger in the middle can be sealed by the second sealing ring, thereby sealing the inner cavity of the pump cavity and the sealing cavity and improving the use effect.

[0007] One end of the plunger extends into the interior of the sealing cavity and is threadedly connected to a sealing column. A return spring is provided on one side of the sealing column. First sealing rings are symmetrically embedded on the outer sides of both ends of the sealing column. A fastening connection mechanism is provided between the rear pump body and the front pump body. A long bolt is inserted in the middle of the pump head. By dragging the sealing column with the return spring, the plunger can drive the sealing column to return to its original position, thereby moving back and forth to deliver liquid. The sealing strength of the sealing column movement is improved by the first sealing rings. The fastening connection mechanism facilitates the separation of the rear pump body and the front pump body for easy maintenance and use. The long bolt facilitates the separation and connection of the rear pump body and the pump head for easy use.

[0008] Preferably, the plunger penetrates the middle of the second sealing ring and fits tightly against the inner cavity of the second sealing ring. The second sealing ring and the limiting groove are adapted to each other. The inner cavity cross-sectional shape of the limiting groove is set to "L" shape. The sealing performance of the gap between the plunger and the rear pump body is improved by the second sealing ring, which improves the performance. The stability of the second sealing ring is also improved by the limiting groove.

[0009] Preferably, the inner diameters of the sealing cavity and the pump cavity are the same, one end of the long bolt extends into the interior of the rear pump body, and the return spring is located in the middle of the pump cavity. The return spring pushes the sealing column, which facilitates the control of the plunger reset. The pump cavity and the sealing cavity are combined to form an overall liquid cavity, which facilitates the maintenance and replacement of the sealing column.

[0010] Preferably, the sealing column is adapted to the sealing cavity, and the wall of the first sealing ring is in close contact with the inner wall of the pump cavity and the sealing cavity. The movement of the sealing column inside the sealing cavity and the pump cavity facilitates the intake and output of liquid, thereby improving the performance.

[0011] Preferably, the fastening connection mechanism includes a positioning groove on the side of the front pump body near the rear pump body, a positioning column fixedly connected to the side of the rear pump body near the front pump body at a position corresponding to the positioning groove, a connecting plate fixedly connected to the side of the front pump body near the rear pump body, a connecting slot provided on the side of the rear pump body near the front pump body, and fixing bolts inserted around the rear pump body at positions corresponding to the connecting slot.

[0012] Preferably, one end of the positioning post extends into the interior of the positioning groove, the connecting plate is adapted to the connecting slot, one end of the connecting plate is inserted into the interior of the connecting slot, a locking through hole is provided in the middle of the connecting plate, the inner cavity cross-sectional shape of the locking through hole is set as a right trapezoid, one end of the fixing bolt is set as a spherical structure, and one end of the fixing bolt extends into the interior of the locking through hole. By inserting the positioning post into the interior of the positioning groove, the connection between the front pump body and the rear pump body can be positioned. When the connecting plate is inserted into the interior of the connecting slot, the locking through hole and the fixing bolt are positioned. By rotating the fixing bolt into the interior of the locking through hole and pressing the inclined wall on one side of the inner cavity of the locking through hole, the connection strength between the front pump body and the rear pump body can be improved, and the performance can be improved.

[0013] The technical effects and advantages of this utility model are as follows:

[0014] This invention first uses a detector to detect the rate of output liquid. When the rate decreases, the speed of the motor inside the front pump body can be adjusted by the controller for easy use, thereby keeping the liquid flow rate stable and achieving intelligent flow stabilization. The rear pump body and the housing are connected by long bolts, which can be easily disassembled, exposing one end of the sealing column. This facilitates the maintenance of the sealing column or the rotation of the sealing column to separate the sealing column from the plunger for replacement, thus improving the performance.

[0015] This utility model also seals the gap between the plunger and the rear pump body through the second sealing ring, and facilitates the reset of the sealing column by pushing the sealing column through the return spring. The fastening connection mechanism facilitates the separation of the rear pump body and the front pump body for easy maintenance and replacement. Furthermore, the compression of the inclined wall of the locking through hole by the fixing bolt can improve the connection sealing strength between the rear pump body and the front pump body. The cooperation of the positioning column and the positioning groove facilitates positioning during installation and improves the performance.

[0016] In summary, through the interaction of the above-mentioned multiple functions, the flow rate of the conveyed liquid can be easily and intelligently adjusted to achieve intelligent flow stabilization. It can also be easily disassembled, inspected, and used, thus improving the performance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the disassembled structure of this utility model.

[0019] Figure 3 This is a schematic diagram of a partially disassembled cross-section of the present invention.

[0020] Figure 4 This is a schematic diagram of the cross-sectional structure of the connection point of this utility model.

[0021] Figure 5 This is a schematic diagram of the connection structure between the front pump body and the plunger of this utility model.

[0022] Figure 6 This is a schematic diagram of the disassembled structure of the rear pump body of this utility model.

[0023] The attached figures are labeled as follows: 1. Front pump body; 2. Rear pump body; 3. Pump head; 4. Controller; 5. Plunger; 6. Detector; 7. Sealing post; 8. First sealing ring; 9. Return spring; 10. Sealing cavity; 11. Limiting groove; 12. Second sealing ring; 13. Pump cavity; 14. Long bolt; 15. Positioning post; 16. Positioning groove; 17. Connecting plate; 18. Locking through hole; 19. Connecting slot; 20. Fixing bolt. 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] As attached Figure 1-6 The intelligent steady-flow liquid chromatography pump shown includes a front pump body 1, a rear pump body 2 on one side of the front pump body 1, a pump head 3 on one side of the rear pump body 2, and a controller 4 on the top of the front pump body 1 for convenient control. A plunger 5 is connected to the output end of the front pump body 1, and a detector 6 is installed at the position of the outlet pipe of the pump head 3 to detect the rate of liquid output. The controller 4 can then be used to control the starting rate of the motor in the middle of the front pump body 1 for convenient control and adjustment.

[0026] A sealing cavity 10 and a pump cavity 13 are respectively provided on the opposite side of the rear pump body 2 and the pump head 3. A limiting groove 11 is provided in the inner cavity of the sealing cavity 10 and on the side of the rear pump body 2 near the front pump body 1. A second sealing ring 12 is provided in the middle of the limiting groove 11. The plunger 5 in the middle can be sealed by the second sealing ring 12, thereby sealing the inner cavity of the pump cavity 13 and the sealing cavity 10, improving the performance.

[0027] One end of the plunger 5 extends into the interior of the sealing cavity 10 and is threadedly connected to the sealing column 7. A return spring 9 is provided on one side of the sealing column 7. First sealing rings 8 are symmetrically embedded on the outer sides of both ends of the sealing column 7. A fastening connection mechanism is provided between the rear pump body 2 and the front pump body 1. A long bolt 14 is inserted in the middle of the pump head 3. By dragging the sealing column 7 with the return spring 9, the plunger 5 can drive the sealing column 7 to reset and move back and forth to transport liquid. The sealing strength of the moving sealing column 7 is improved by the first sealing ring 8. The fastening connection mechanism makes it easy to separate the rear pump body 2 from the front pump body 1 for easy maintenance and use. The long bolt 14 makes it easy to separate and connect the rear pump body 2 and the pump head 3 for easy use.

[0028] As attached Figure 1-6 As shown, the plunger 5 penetrates the middle of the second sealing ring 12 and fits tightly against the inner cavity of the second sealing ring 12. The second sealing ring 12 and the limiting groove 11 are adapted to each other. The inner cross-sectional shape of the limiting groove 11 is set to "L". The inner diameters of the sealing cavity 10 and the pump cavity 13 are the same. One end of the long bolt 14 extends into the interior of the rear pump body 2. The return spring 9 is set in the middle of the pump cavity 13. The sealing column 7 is adapted to the sealing cavity 10. The wall of the first sealing ring 8 is flush with the inner walls of the pump cavity 13 and the sealing cavity 10. The bodies fit tightly together, and the second sealing ring 12 improves the sealing performance of the gap between the plunger 5 and the rear pump body 2, thus improving the performance. The limiting groove 11 improves the stability of the second sealing ring 12. The push of the sealing column 7 by the return spring 9 facilitates the control of the plunger 5 to return to its original position. The pump chamber 13 and the sealing chamber 10 are combined to form an overall liquid chamber, which facilitates the maintenance and replacement of the sealing column 7. The movement of the sealing column 7 within the sealing chamber 10 and the pump chamber 13 facilitates the intake and output of liquid, thus improving the performance.

[0029] As attached Figure 2 , 4As shown in Figures 5 and 6, the fastening connection mechanism includes a positioning groove 16 on the side of the front pump body 1 near the rear pump body 2; a positioning post 15 is fixedly connected to the side of the rear pump body 2 near the front pump body 1 at a position corresponding to the positioning groove 16; a connecting plate 17 is fixedly connected to the side of the front pump body 1 near the rear pump body 2; a connecting slot 19 is provided on the side of the rear pump body 2 near the front pump body 1; fixing bolts 20 are inserted around the rear pump body 2 at positions corresponding to the connecting slot 19; one end of the positioning post 15 extends into the interior of the positioning groove 16; the connecting plate 17 is adapted to the connecting slot 19; and one end of the connecting plate 17 is inserted into the interior of the connecting slot 19. A locking through hole 18 is provided in the middle. The inner cavity of the locking through hole 18 is set as a right trapezoid. One end of the fixing bolt 20 is set as a spherical structure and extends into the interior of the locking through hole 18. The positioning pin 15 is inserted into the interior of the positioning groove 16 to position the connection between the front pump body 1 and the rear pump body 2. When the connecting plate 17 is inserted into the interior of the connecting slot 19, the locking through hole 18 and the fixing bolt 20 are positioned. By rotating the fixing bolt 20 into the interior of the locking through hole 18 and pressing the inclined wall on one side of the inner cavity of the locking through hole 18, the connection strength between the front pump body 1 and the rear pump body 2 can be improved, thus improving the performance.

[0030] The working principle of this utility model is as follows: When in use, by removing the long bolt 14, the pump head 3 and the rear pump body 2 can be separated, allowing one end of the sealing column 7 to be exposed. By rotating the sealing column 7, the sealing column 7 and the plunger 5 can be separated, making it convenient to inspect and replace the sealing column 7, thereby facilitating the inspection and replacement of the first sealing ring 8. By rotating the fixing bolt 20, the compression limit on the locking through hole 18 can be loosened, making it convenient to separate the rear pump body 2 and the front pump body 1, thereby allowing the inspection and replacement of the second sealing ring 12 in the middle of the limiting groove 11, improving the performance.

[0031] The positioning column 15 and the positioning groove 16 work together to position the liquid during assembly, making it easy to connect and use. The detector 6 detects the output liquid rate. When the liquid rate decreases, the delivery flow rate will change. At this time, the controller 4 can adjust the speed of the motor inside the front pump body 1 to keep the liquid flow rate stable and achieve the function of intelligent flow stabilization.

[0032] 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. An intelligent steady-flow liquid chromatography pump, comprising a pre-pump body (1), characterized in that: A rear pump body (2) is provided on one side of the front pump body (1), a pump head (3) is provided on one side of the rear pump body (2), a controller (4) is provided on the top of the front pump body (1), a plunger (5) is connected to the output end of the front pump body (1), and a detector (6) is provided at the position of the liquid outlet pipe of the pump head (3). The rear pump body (2) and the pump head (3) are respectively provided with a sealing cavity (10) and a pump cavity (13) on opposite sides. The inner cavity of the sealing cavity (10) and the side of the rear pump body (2) near the front pump body (1) are provided with a limiting groove (11). A second sealing ring (12) is provided in the middle of the limiting groove (11). One end of the plunger (5) extends into the interior of the sealing cavity (10) and is threadedly connected to a sealing column (7). A return spring (9) is provided on one side of the sealing column (7). First sealing rings (8) are symmetrically embedded on the outer sides of both ends of the sealing column (7). A fastening connection mechanism is provided between the rear pump body (2) and the front pump body (1). A long bolt (14) is inserted in the middle of the pump head (3).

2. The intelligent steady-flow liquid chromatography pump according to claim 1, characterized in that: The plunger (5) penetrates the middle of the second sealing ring (12) and fits tightly against the inner cavity of the second sealing ring (12). The second sealing ring (12) and the limiting groove (11) are adapted to each other. The inner cavity cross-sectional shape of the limiting groove (11) is set to "L".

3. The intelligent steady-flow liquid chromatography pump according to claim 1, characterized in that: The sealing cavity (10) and the pump cavity (13) have the same inner diameter. One end of the long bolt (14) extends into the interior of the rear pump body (2). The reset spring (9) is located in the middle of the pump cavity (13).

4. The intelligent steady-flow liquid chromatography pump according to claim 1, characterized in that: The sealing column (7) is adapted to the sealing cavity (10), and the wall of the first sealing ring (8) is in close contact with the inner wall of the pump cavity (13) and the sealing cavity (10).

5. The intelligent steady-flow liquid chromatography pump according to claim 1, characterized in that: The fastening connection mechanism includes a positioning groove (16) on the side of the front pump body (1) near the rear pump body (2), a positioning column (15) is fixedly connected to the side of the rear pump body (2) near the front pump body (1) at a position corresponding to the positioning groove (16), a connecting plate (17) is fixedly connected to the side of the front pump body (1) near the rear pump body (2), a connecting slot (19) is provided on the side of the rear pump body (2) near the front pump body (1), and fixing bolts (20) are inserted around the rear pump body (2) at positions corresponding to the connecting slot (19).

6. The intelligent steady-flow liquid chromatography pump according to claim 5, characterized in that: One end of the positioning post (15) extends into the interior of the positioning groove (16). The connecting plate (17) is adapted to the connecting slot (19). One end of the connecting plate (17) is inserted into the interior of the connecting slot (19). A locking through hole (18) is provided in the middle of the connecting plate (17). The inner cavity cross-sectional shape of the locking through hole (18) is set as a right trapezoid. One end of the fixing bolt (20) is set as a spherical structure. One end of the fixing bolt (20) extends into the interior of the locking through hole (18).

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