A multi-channel syringe pump

Abstract

This utility model discloses a multi-channel syringe pump, relating to the field of fluid delivery equipment technology, aiming to solve the problems of complex structure, high manufacturing cost, difficult maintenance, and limited application range due to fixed flow channel materials in existing multi-channel syringe pump flow channel switching systems. The syringe pump includes a frame, a lead screw motor mounted on the frame, a manifold, multiple solenoid valves, a syringe, and a control circuit board. The manifold has a syringe connection port at its bottom and multiple dispensing ports on both sides, each dispensing port corresponding to a solenoid valve. The lead screw motor drives the syringe plunger through a lead screw nut and a push block, achieving precise control of liquid extraction and dispensing in conjunction with an optocoupler sensor. This utility model combines a manifold with standard solenoid valves, simplifying the structure and reducing costs. The manifold material can be flexibly changed according to liquid characteristics, and the modular design facilitates maintenance. The integrated frame improves equipment stability, making it suitable for multiple fields such as medical, food, and water quality analysis.

Description

Technical Field

[0001] This utility model relates to the field of precision fluid delivery equipment, specifically to a multi-channel injection pump, which is suitable for scenarios such as drug infusion in the medical industry, sample testing in the food industry, and reagent addition in the field of water quality analysis. Background Technology

[0002] Multichannel syringe pumps, as devices capable of switching between multiple channels and precise liquid transfer, are widely used in medical, food, and water quality analysis fields. Most existing multichannel syringe pumps on the market rely on integrated multi-port rotary valves for their flow channel switching function. For example, a multichannel syringe pump and its usage method disclosed in CN119982425A employs an integrated valve body. Through multiple liquid exchange orifices, automatic switching of the orifices, and piston control, it achieves high-precision, automated, multichannel, high-frequency, and high-accuracy liquid transfer.

[0003] However, this integrated valve body has significant drawbacks: 1. The integrated multi-way rotary valve has a complex structure and requires extremely high machining precision, which leads to a significant increase in equipment manufacturing costs and is not conducive to large-scale promotion and application. 2. Once the internal flow channel of the integrated valve becomes blocked or damaged, the entire valve body often needs to be replaced because it is a single structure. This not only results in high maintenance costs but also long replacement cycles, which seriously affects the normal operating efficiency of the equipment. 3. The flow channel material of the existing equipment is fixed, and it is not possible to flexibly change the material to match the characteristics of the liquid being infused (such as strong corrosiveness or high adsorption). This may lead to corrosion and damage to the flow channel or contamination of the liquid, which limits the applicable scenarios of the equipment. 4. Traditional multi-channel pumps are mostly composed of separate structures, which have poor overall rigidity. When multiple drive modules work at the same time, they are prone to vibration and deformation, which affects the accuracy and reliability of long-term infusion.

[0004] To overcome the shortcomings of the prior art, this utility model proposes a multi-channel injection pump with simplified structure, low cost, convenient maintenance and wide application range. Utility Model Content

[0005] The purpose of this invention is to provide a multi-channel syringe pump that solves the problems of complex structure, high manufacturing cost, difficult maintenance, and limited application range caused by fixed flow channel materials in existing multi-channel syringe pump flow channel switching systems, while improving the overall stability of the equipment and the accuracy of infusion.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-channel injection pump, including a frame, four sets of solenoid valves fixed on one side of the top of the frame, and a manifold fixed on the other side of the top of the frame by screws. The manifold has four dispensing ports on both sides, each corresponding to one of the solenoid valves, and each dispensing port is opened and closed by the control of its corresponding solenoid valve. The frame is located below the four sets of solenoid valves and has a driving component and a pusher block that moves linearly under the drive component. An injection component is fixed below the manifold block. The bottom of the manifold block has a syringe connection port that connects to the injection component. The manifold block has a cavity that connects the injection component to each dispensing port. The injection component is driven by the pusher block to draw and inject liquid through each dispensing port. A control circuit board is fixed on the outside of the frame. The control circuit board is equipped with a photosensitive device that quantitatively controls the aspiration or injection volume by sensing the change in the position of the pusher block.

[0007] Preferably, the driving component includes a lead screw motor, which is installed inside the frame. The lead screw motor has a lead screw nut connected to the lead screw external thread at the output end of the lead screw motor, and the lead screw nut is fixed to the push block by bolts.

[0008] Preferably, a guide rail slider is installed on the frame located on one side of the lead screw motor, and the push block is fixed to the slider of the guide rail slider by bolts.

[0009] Preferably, the injection component includes a syringe, which is fixed to the bottom of the manifold and communicates with each dispensing port through the syringe connector and the inner cavity of the manifold. The bottom of the syringe is provided with a downwardly extending syringe plunger, and the plunger is fixed to the syringe plunger by a fixing screw.

[0010] Preferably, the light sensing device includes a baffle and two optical couplers. The baffle is fixed to one end of the push block near the control circuit board, and the two optical couplers are fixed on the control circuit board one above the other, with their illumination direction facing the path of the baffle.

[0011] Once the optocoupler sensor detects that the baffle is in place, it sends a signal to the control circuit board. The control circuit board then controls the lead screw motor to stop running immediately and de-energizes the corresponding solenoid valve to stop pumping or injecting liquid.

[0012] Preferably, the busbar is made of PEEK, PTFE, stainless steel or ceramic material.

[0013] Compared with the prior art, the present invention provides a multi-channel injection pump, which has the following beneficial effects: 1. This utility model replaces the traditional complex integrated switching valve with a combination of manifold and multiple standard solenoid valves. The manifold has a simple structure and is easy to process, while the standard solenoid valves are mature outsourced components with low procurement costs. The combination of the two greatly simplifies the equipment structure and significantly reduces manufacturing and procurement costs. 2. The hydraulic system of this utility model adopts a modular design, and the solenoid valve and manifold are detachably connected. If a certain flow channel fails (such as solenoid valve failure or flow channel blockage), it is not necessary to replace the entire flow channel system. Only the corresponding individual solenoid valve or manifold needs to be replaced. The maintenance operation is simple, the required time is short, and the maintenance cost is extremely low. 3. In this utility model, the manifold is an independent component, and different materials (PEEK, PTFE, stainless steel, ceramic, etc.) can be flexibly selected or replaced according to the characteristics of the infused liquid (such as corrosivity and purity requirements), avoiding equipment damage or liquid contamination caused by incompatibility between the liquid and the flow channel material, and greatly expanding the application scenarios of the equipment. 4. This utility model adopts an integrated frame structure to enhance the overall rigidity and stability of the equipment and reduce the vibration and deformation generated when multiple drive modules are working. At the same time, the guiding effect of the guide rail slider combined with the precise control of the optocoupler sensor further ensures the accuracy of the syringe plunger movement and improves the accuracy and reliability of long-term infusion. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a front view schematic diagram of a multi-channel injection pump proposed in this utility model; Figure 2 This is a schematic diagram of the left-side structure of a multi-channel injection pump proposed in this utility model; Figure 3 This is a schematic diagram of the right side of a multi-channel injection pump proposed in this utility model; Figure 4 This is a top view schematic diagram of a multi-channel injection pump proposed in this utility model; Figure 5 This is a schematic diagram of the exploded structure of a multi-channel injection pump proposed in this utility model; Figure 6 This is a three-dimensional structural diagram of the solenoid valve and manifold proposed in this utility model; Figure 7 This is a schematic diagram of the planar structure of the solenoid valve and manifold proposed in this utility model; Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure at point AA; Figure 9 This is a schematic diagram of the pusher block structure proposed in this utility model; Figure 10 This is a schematic diagram of the frame structure proposed in this utility model; In the diagram: 1. Solenoid valve; 2. Lead screw motor; 3. Frame; 4. Screw; 5. Manifold; 51. Syringe connector; 52. Dispenser port; 6. Syringe; 7. Syringe plunger; 8. Guide rail slider; 9. Fixing screw; 10. Push block; 11. Lead screw nut; 12. Baffle; 13. Optical coupler sensor; 14. Control circuit board. Detailed Implementation

[0015] 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.

[0016] Please see Figures 1-10 This utility model provides a multi-channel syringe pump, including a frame 3, a lead screw motor 2, a manifold 5, multiple solenoid valves 1, a syringe 6, a syringe plunger 7, a plunger block 10, a lead screw nut 11, a baffle 12, an optocoupler sensor 13, a control circuit board 14, a guide rail slider 8, screws 4, and fixing screws 9. The connections and functions of each component are as follows: Frame 3: Adopts an integrated structure, with screws 4 fixing components such as the lead screw motor 2 and manifold 5, enhancing the overall rigidity of the equipment, reducing vibration and deformation, and ensuring infusion stability; Power and transmission mechanism: The lead screw at the output end of the lead screw motor 2 is threadedly connected to the lead screw nut 11. The push block 10 is fixed to the lead screw nut 11 by bolts. The syringe push rod 7 is connected to the push block 10 by fixing screw 9. When the lead screw motor 2 is running, it drives the lead screw nut 11, the push block 10 and the syringe push rod 7 to move up and down to realize liquid extraction and liquid discharge. Guiding and support mechanism: The slider of the guide rail slider 8 is fixedly connected to the push block 10 and slides with the guide rail on the frame 3. It plays a guiding role when the push block 10 moves, avoids deviation, and improves the accuracy of movement. Flow channel switching mechanism: The bottom of the manifold 5 is provided with a syringe connection port 51, which is sealed to the syringe 6; two dispensing ports 52 are provided on each side of the manifold 5, J1 and J3 on one side and J2 and J4 on the other side. Each dispensing port 52 is equipped with a solenoid valve 1; the solenoid valve 1 is electrically connected to the control circuit board 14. The control circuit board 14 controls the solenoid valve 1 to open and close the flow channel, thereby completing the multi-channel switching. Precision control mechanism: The baffle 12 is fixed on the push block 10, and two optocoupler sensors 13 are fixed on the upper and lower sides of the frame 3 respectively and electrically connected to the control circuit board 14. When the baffle 12 moves with the push block 10 to the detection area of ​​the optocoupler sensor 13, the optocoupler sensor 13 sends a signal to the control circuit board 14 to control the start and stop of the lead screw motor 2, thereby achieving precise control of liquid pumping and draining.

[0017] In addition, the manifold 5 can be disassembled into an independent component by screw 4, and materials such as PEEK, PTFE, stainless steel or ceramic can be selected according to the characteristics of the infused liquid, such as corrosivity and purity requirements, so as to flexibly replace it to adapt to different application scenarios.

[0018] The workflow of the multi-channel syringe pump in this embodiment is as follows: 1. Liquid extraction operation: The user sets the inlet channel to the J1 dispensing port 52 and the extraction volume to 10mL via the control circuit board 14, and presses the start button; the control circuit board 14 controls the solenoid valve 1 corresponding to the J1 dispensing port 52 to be energized and opened, and at the same time controls the lead screw motor 2 to rotate forward, the lead screw nut 11 drives the push block 10 to move downward, the syringe push rod 7 is pulled down, and the liquid enters the syringe 6 through the J1 dispensing port 52; when the baffle 12 on the push block 10 triggers the optocoupler sensor 13 below, the lead screw motor 2 stops, the solenoid valve 1 is de-energized, and the liquid extraction is completed; 2. Drainage Operation: The user sets the outlet channel to dispensing port J4 52 and presses the drain button; the control circuit board 14 energizes and opens the solenoid valve 1 corresponding to dispensing port J4 52, the lead screw motor 2 rotates in reverse, the push block 10 moves upward, the syringe plunger 7 pushes upward, and the liquid is discharged through dispensing port J4 52; when the baffle 12 triggers the upper optocoupler sensor 13, the lead screw motor 2 stops, the solenoid valve 1 is de-energized, and the drainage is completed. The multi-channel syringe pump in this embodiment has been tested and shows a pipetting accuracy error ≤ ±0.5%, and can work continuously for 8 hours without failure, making it suitable for multi-channel precision delivery of corrosive reagents in chemical laboratories.

[0019] 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 multi-channel syringe pump, characterized in that, Includes a frame (3), on one side of the top of the frame (3) are four sets of solenoid valves (1), and on the other side of the top of the frame (3) are a manifold (5) fixed by screws (4). The manifold (5) has four liquid outlets (52) on both sides that correspond one-to-one with each set of solenoid valves (1), and each liquid outlet (52) is opened and closed by the control of its corresponding solenoid valve (1). The frame (3) is located below the four sets of solenoid valves (1) and is equipped with a driving component and a pusher (10) that moves linearly under the drive of the driving component. An injection component is fixed below the manifold (5). The bottom of the manifold (5) is provided with a syringe connection port (51) connected to the injection component. The manifold (5) is provided with a cavity that allows the injection component to communicate with each liquid outlet (52). The injection component is driven by the pusher (10) to draw and inject liquid through each liquid outlet (52). A control circuit board (14) is fixed on the outside of the frame (3). The control circuit board (14) is provided with a light-sensing device that quantitatively controls the aspiration or injection volume by sensing the position change of the pusher (10).

2. The multi-channel syringe pump according to claim 1, characterized in that, The driving component includes a lead screw motor (2), which is installed inside the frame (3). The lead screw motor (2) is connected to the lead screw nut (11) by the lead screw external thread at the output end of the lead screw motor (2). The lead screw nut (11) is fixed to the push block (10) by bolts.

3. The multi-channel syringe pump according to claim 2, characterized in that, A guide rail slider (8) is installed on the frame (3) located on one side of the lead screw motor (2), and the push block (10) is fixed to the slider of the guide rail slider (8) by bolts.

4. The multi-channel syringe pump according to claim 2, characterized in that, The injection component includes a syringe (6), which is fixed to the bottom of the manifold (5) and communicates with each dispensing port (52) through the syringe connection port (51) and the inner cavity of the manifold (5). The bottom of the syringe (6) is provided with a downwardly extending syringe plunger (7), and the plunger (10) is fixed to the syringe plunger (7) by a fixing screw (9).

5. The multi-channel syringe pump according to claim 1, characterized in that, The light sensing device includes a baffle (12) and two optical couplers (13). The baffle (12) is fixed to one end of the push block (10) near the control circuit board (14). The two optical couplers (13) are fixed on the control circuit board (14) one above the other, and the illumination direction is directly opposite the path of the baffle (12).

6. The multi-channel syringe pump according to claim 5, characterized in that, After the optocoupler sensor (13) detects that the baffle (12) is in place, it will send a signal to the control circuit board (14). The control circuit board (14) will control the lead screw motor (2) to stop running immediately and control the corresponding solenoid valve (1) to de-energize and stop pumping or injecting liquid.

7. The multi-channel syringe pump according to claim 1, characterized in that, The busbar (5) is made of PEEK, PTFE, stainless steel or ceramic material.

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