High-precision constant-flow injection pump
By using a servo motor-driven ball screw system and an extrusion deformation block structure, the problems of inaccurate needle force and loose connection in constant flow injection pumps are solved, achieving high-precision liquid delivery and equipment stability, and reducing failure rate and operating costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANGZHOU GONGLV ULTRASONIC EQUIP CO LTD
- Filing Date
- 2025-06-03
- Publication Date
- 2026-04-17
AI Technical Summary
Existing constant flow syringe pumps cannot guarantee the accuracy of needle force during injection, resulting in inconsistent liquid pressure. Furthermore, the connection between the needle and the switching valve is not tight enough, which can easily lead to pressure fluctuations and liquid leakage.
The ball screw system driven by a servo motor, combined with extrusion deformation blocks and multiple restraint structures, ensures the stability and tightness of the needle tube, and improves the heat dissipation and drying environment of the equipment through a fan and drying system.
It achieves high-precision liquid delivery, reduces equipment failure rate and maintenance costs, improves work efficiency and adaptability, prevents liquid leakage, and ensures the stability and energy-saving effect of the equipment in a quiet operating environment.
Smart Images
Figure CN224134783U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of syringe pump technology, specifically a high-precision constant flow syringe pump. Background Technology
[0002] A constant flow syringe pump is a precision instrument that delivers fluids at a constant flow rate. It is mainly used in medical laboratories, drug development, biotechnology, and scientific research. It ensures that the fluid flows at a stable rate, which is very important for many experiments and applications because it can reduce the deviation of results caused by changes in flow rate. Such pumps usually include an adjustable flow rate setting and can precisely control the infusion rate to meet the needs of different application scenarios. Some advanced constant flow syringe pumps can also be equipped with microprocessors to achieve more precise control and monitoring functions.
[0003] In actual injection use, current constant flow injection pumps cannot guarantee the accuracy of the force applied to the syringe tube when it is squeezed. This can lead to inconsistent liquid pressure when the force applied to the syringe tube deviates. At the same time, the connection between the syringe tube and the switching valve of the constant flow pump cannot be guaranteed to be tight, which can easily lead to pressure fluctuations and liquid leakage. Summary of the Invention
[0004] (a) Technical problems to be solved
[0005] To address the shortcomings of existing technologies, this utility model provides a high-precision constant flow injection pump, which solves the problems of current constant flow injection pumps in actual injection use. Due to the inability to guarantee the force accuracy of the needle tube under pressure, the liquid pressure is easily inconsistent when the needle tube is subjected to deviations in force. At the same time, the connection between the needle tube of the constant flow pump and the switching valve cannot be guaranteed to be tight, which easily leads to pressure fluctuations and liquid leakage.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-precision constant flow injection pump, including a housing, a touch screen is embedded in the top of the housing, and two connecting valve seats are symmetrically installed on the top front of the housing, and a switching valve is rotatably connected to the inner side of the connecting valve seats. A mounting base is fixedly installed on the front of the housing at the bottom position of the two switching valves, and a needle is detachably connected to the inner side of the mounting base.
[0007] A servo motor is fixedly installed on one side of the inner side of the housing. A coupling is connected to the bottom transmission end of the servo motor. A ball screw is connected to the bottom power output end of the coupling. A slider is connected to the outside of the ball screw by a thread. A support base is fixedly connected to one end of the slider. A floating joint is installed at the top of the support base corresponding to the bottom position of the needle tube.
[0008] The edge of the housing is provided with a guide groove, and the support base slides along the guide groove. The inner side of the housing is fixedly installed with a slider guide rail by a support plate, and the slider slides along the slider guide rail.
[0009] The bottom end of the switching valve is connected to a connecting tube head, the top end of the needle tube is connected to a top tube head, the inner side of the connecting tube head is provided with a circular fitting groove, and a compression deformation block is tightly inserted and connected in the fitting groove.
[0010] As a preferred technical solution for the high-precision constant flow injection pump of this utility model, the centers of the connecting tube head, top tube, needle tube and floating connector in the vertical direction are all located on the same straight line, the side of the switching valve is connected to the injection conduit, and the servo motor is controlled by the controller.
[0011] As a preferred technical solution for the high-precision constant flow injection pump of this utility model, the extrusion deformation block is made of natural rubber, and the inner side of the extrusion deformation block is provided with an inclined groove. The top pipe squeezes the extrusion deformation block through the extrusion action, and the extrusion deformation block is in close contact with the top pipe.
[0012] As a preferred technical solution for the high-precision constant flow injection pump of this utility model, a fixed pressure plate is provided on the top of the mounting base. A limiting circular groove is opened inside the fixed pressure plate, and a disc seat is fixedly connected to the bottom end of the needle tube. The needle tube passes through the limiting circular groove, and the disc seat at the bottom of the needle tube is embedded in the interior of the mounting base. The mounting base and the fixed pressure plate are connected by fastening bolts.
[0013] As a preferred technical solution for the high-precision constant flow injection pump of this utility model, the top of the mounting base is provided with a limiting groove, the disc seat is embedded in the limiting groove, and the edge of the needle tube is fitted and connected to the inner wall of the limiting groove.
[0014] As a preferred technical solution for the high-precision constant flow injection pump of this utility model, a fan is provided at the back end of the housing, and the fan is embedded and connected to the inner side of the housing through an end plate at its end. A collection box is connected to the end of the end plate on one side of the fan, and a sponge block is embedded and connected to the inner side of the collection box, and a drying bag is embedded and connected to the inner side of the sponge block.
[0015] As a preferred technical solution for the high-precision constant flow injection pump of this utility model, a cover plate is provided on the outer side of the collection box, and through holes are uniformly provided on the inner side of the cover plate. A cavity is provided inside the collection box, and the sponge block is tightly attached to the cavity. Beneficial effects
[0016] Compared with the prior art, this utility model provides a high-precision constant flow injection pump, which has the following beneficial effects:
[0017] 1. The servo motor drives the coupling and ball screw to rotate, driving the slider to slide stably along the slider guide rail, and synchronously driving the support seat to move. With the guiding and limiting effect of the guide groove, the support seat can maintain positional accuracy during lifting and sliding. Through multiple constraints, it is further ensured that the support seat will not deviate when driving the floating joint to rise. The floating joint drives the plug rod of the needle to move upward, so that the liquid in the needle can be squeezed out from the top tube and connecting tube head to the switching valve under pressure, thus facilitating the constant delivery of liquid in the future.
[0018] The servo motor, controlled by a touchscreen and controller, operates under a closed-loop control system during constant flow infusion. This system enables precise control of position, speed, and torque, ensuring high-precision motion control. This results in extremely high accuracy and stability for the syringe pump when delivering liquids, meeting various high-precision metering requirements. Furthermore, the servo motor's high response speed allows for rapid response to start and stop signals, ensuring excellent dynamic performance during operation. This results in outstanding performance during rapid start and stop, improving overall work efficiency. By precisely controlling speed and position, the servo motor ensures stable performance during operation, reducing equipment failure rates and maintenance costs. This allows the syringe pump to perform well over extended periods, minimizing maintenance needs.
[0019] In addition, servo motors have strong overload capacity and anti-interference capabilities, and can maintain stable performance under various load conditions. This makes the infusion pump perform well in the face of different working environments and load changes, with strong adaptability. The heat generation and noise levels of servo motors are low, which improves the comfort of use. This is especially important for medical equipment that requires a quiet operating environment. Servo motors can also provide corresponding power according to actual needs, avoiding energy waste and having a good energy-saving effect. For medical equipment that needs to operate for a long time, it can significantly reduce operating costs.
[0020] 2. When the needle tube moves the top tube upward to connect with the connecting tube head, the upward squeezing action of the top tube tube allows it to compress the extrusion deformation block inside the connecting tube head. This causes the extrusion deformation block to deform under pressure. The deformation of the extrusion deformation block, along with the fitting groove, limits the direction of deformation, ensuring that the extrusion deformation block tightly covers the edge of the top tube tube. This guarantees a higher degree of tightness in the connection between the top tube tube and the connecting tube head, preventing even slight gaps that could cause pressure fluctuations and further preventing liquid leakage.
[0021] 3. The mounting base, fixed pressure plate, limiting groove, and fastening bolts allow the disc seat at the bottom edge of the needle to be engaged in the mounting base during needle assembly. Simultaneously, the needle passes through the limiting groove in the fixed pressure plate. This initial positioning of the needle bottom is achieved through the mounting base and fixed pressure plate, while the fastening bolts secure the mounting base and fixed pressure plate, ensuring more stable needle positioning and stability during constant flow infusion. This method also facilitates needle disassembly for easy replacement and cleaning, making maintenance of the constant flow pump more convenient.
[0022] 4. The end plate facilitates stable installation of the fan, which quickly removes heat generated during operation from the constant flow pump housing, thus improving the heat dissipation effect inside the constant flow pump. At the same time, the central box facilitates stable placement of the sponge block, which effectively intercepts dust and debris in the air. Combined with the internal drying bag, it effectively absorbs humid air inside the constant flow pump, improving the dry environment inside the pump, preventing short circuits, and ensuring stable operation of the constant flow pump. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of this utility model.
[0024] Figure 2 This is a schematic diagram of the internal structure of this utility model.
[0025] Figure 3 This is a schematic diagram of the structure of the syringe of this utility model.
[0026] Figure 4 This is a cross-sectional view of the connecting pipe head of this utility model.
[0027] Figure 5 This is a structural schematic diagram of the fan of this utility model.
[0028] In the diagram: 1. Touch screen; 2. Switching valve; 3. Needle; 4. Floating connector; 5. Housing; 6. Ball screw; 7. Slider; 8. Coupling; 9. Servo motor; 10. Support base; 11. Guide groove; 12. Slider guide rail; 13. Connecting pipe head; 14. Top pipe; 15. Mounting base; 16. Fixed pressure plate; 17. Restricting circular groove; 18. Disc seat; 19. Fastening bolt; 20. Fitting groove; 21. Extrusion deformation block; 22. Fan; 23. End plate; 24. Central box; 25. Sponge block; 26. Drying bag; 27. Connecting valve seat. Detailed Implementation
[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present utility model.
[0030] In the description of this utility model, it should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to the other element.
[0031] In the description of this utility model, it should be noted that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.
[0032] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example
[0033] Please see Figure 1-5The present invention provides the following technical solution: a high-precision constant flow injection pump, including a housing 5, a touch screen 1 embedded in the top of the housing 5, two connecting valve seats 27 symmetrically installed on the top front of the housing 5, and a switching valve 2 rotatably connected to the inner side of the connecting valve seat 27, and a mounting base 15 fixedly installed at the bottom of the two switching valves 2 on the front of the housing 5, and a needle tube 3 detachably connected to the inner side of the mounting base 15;
[0034] A servo motor 9 is fixedly installed on one side of the inner side of the housing 5. A coupling 8 is connected to the bottom transmission end of the servo motor 9. A ball screw 6 is connected to the bottom power output end of the coupling 8. A slider 7 is connected to the outside of the ball screw 6 by a thread. A support base 10 is fixedly connected to one end of the slider 7. A floating connector 4 is installed on the top of the support base 10 at the position corresponding to the bottom of the needle tube 3.
[0035] The edge of the housing 5 is provided with a guide groove 11, and the support base 10 slides along the guide groove 11. The inner side of the housing 5 is fixedly installed with a slider guide rail 12 by a support plate, and the slider 7 slides along the slider guide rail 12.
[0036] The bottom of the switching valve 2 is connected to a connecting tube 13, and the top of the needle tube 3 is connected to a top tube 14. The centers of the connecting tube 13, the top tube 14, the needle tube 3, and the floating connector 4 are all located on the same straight line in the vertical direction. An injection tubing is connected to the side of the switching valve 2. The servo motor 9 is controlled by a controller to facilitate constant subsequent liquid delivery. The servo motor 9, through a closed-loop control system, can achieve precise control of position, speed, and torque, ensuring high-precision motion control and giving the injection pump extremely high accuracy and stability when delivering liquid. A circular fitting groove is provided on the inner side of the connecting tube 13. 20, and a compression deformation block 21 is tightly inserted and connected in the fitting groove 20. The compression deformation block 21 is made of natural rubber, and an inclined groove is provided on the inner side edge of the compression deformation block 21. The top pipe 14 compresses the compression deformation block 21 by compression, and the compression deformation block 21 is in close contact with the top pipe 14. Through the deformation of the compression deformation block 21, the fitting groove 20 limits the deformation direction of the compression deformation block 21, so that the compression deformation block 21 can tightly cover the edge of the top pipe 14, thereby ensuring a higher connection tightness between the top pipe 14 and the connecting pipe head 13 when they are connected.
[0037] The top of the mounting base 15 is provided with a fixing plate 16, and the inside of the fixing plate 16 is provided with a limiting groove 17. The bottom end of the needle tube 3 is fixedly connected to a disc seat 18. The top of the mounting base 15 is provided with a limiting groove, and the disc seat 18 is embedded in the limiting groove. The edge of the needle tube 3 is fitted and connected to the inner wall of the limiting groove 17. The mounting base 15 and the fixing plate 16 facilitate the initial limiting of the bottom of the needle tube 3. The mounting base 15 and the fixing plate 16 are locked and limited by the fastening bolts 19, so as to more stably limit the needle tube 3 and ensure the stability of the needle tube 3 during constant flow infusion. The needle tube 3 passes through the limiting groove 17, and the disc seat 18 at the bottom of the needle tube 3 is embedded in the inside of the mounting base 15. The mounting base 15 and the fixing plate 16 are connected by the fastening bolts 19.
[0038] A fan 22 is provided at the back end of the housing 5, and the fan 22 is embedded in the inner side of the housing 5 through the end plate 23 at its end. A collection box 24 is connected to the end of the end plate 23 on one side of the fan 22, and a sponge block 25 is embedded in the inner side of the collection box 24. A drying bag 26 is embedded in the inner side of the sponge block 25. A cover plate is provided at the outer side of the collection box 24, and through holes are evenly arranged on the inner side of the cover plate. A cavity is provided inside the collection box 24, and the sponge block 25 is tightly attached to the cavity. The collection box 24 facilitates the stable placement of the sponge block 25, and the sponge block 25 facilitates the interception of dust and debris in the air. Combined with the drying bag 26 inside, it facilitates the adsorption of humid air inside the constant flow pump.
[0039] The working principle and usage process of this utility model are as follows: During injection, the touch screen 1 and the controller control the servo motor 9 to run. After the servo motor 9 is started, it drives the coupling 8 and the ball screw 6 to rotate, driving the slider 7 to slide stably along the slider guide rail 12, and synchronously driving the support seat 10 to move. With the guidance and restriction of the guide groove 11, the support seat 10 can maintain positional accuracy when sliding up and down. Through multiple restrictions, it is further ensured that the support seat 10 will not deviate when driving the floating joint 4 to rise. The floating joint 4 drives the plug rod of the needle tube 3 to move upward, so that the liquid in the needle tube 3 can be squeezed out of the top tube 14 and the connecting tube head 13 to the switching valve 2 under the pressure, thereby facilitating the constant delivery of liquid in the future.
[0040] During constant flow infusion, the servo motor 9, through a closed-loop control system, can achieve precise control of position, speed, and torque, enabling the syringe pump to have extremely high accuracy and stability when delivering liquids, meeting various high-precision metering requirements. The servo motor 9 has a high response speed and can quickly respond to start and stop signals, ensuring that the syringe pump has good dynamic performance during operation. By precisely controlling the speed and position, the servo motor 9 ensures that the syringe pump has stable performance during operation.
[0041] In addition, the servo motor 9 has strong overload capacity and anti-interference capability, and can maintain stable performance under various load conditions, making the syringe pump perform well in the face of different working environments and load changes. It is highly adaptable. The servo motor 9 has low heat generation and noise levels, which is especially important for medical equipment that requires a quiet operating environment. The servo motor 9 can also provide corresponding power according to actual needs, avoiding energy waste and having a good energy-saving effect.
[0042] When assembling and connecting the top pipe 14 and the connecting pipe head 13, the upward pressing action of the top pipe 14 allows the top pipe 14 to press the extrusion deformation block 21 inside the connecting pipe head 13, causing the extrusion deformation block 21 to deform under pressure. Through the deformation of the extrusion deformation block 21, the fitting groove 20 limits the deformation direction of the extrusion deformation block 21, allowing the extrusion deformation block 21 to tightly cover the edge of the top pipe 14. This ensures a higher connection tightness between the top pipe 14 and the connecting pipe head 13 during the mating connection, preventing the appearance of weak gaps that could cause pressure loss fluctuations and further preventing liquid leakage.
[0043] During the operation of the servo motor 9 and other electrical components inside the housing 5, the fan 22 quickly removes and discharges the heat generated during the operation of the constant flow pump housing 5, thereby improving the heat dissipation effect inside the constant flow pump. During the heat dissipation process, the sponge block 25 is conveniently and stably placed using the centralized box 24. The sponge block 25 conveniently intercepts dust and debris in the air. Combined with the drying bag 26 inside, it conveniently absorbs the humid air inside the constant flow pump, improves the dry environment inside the constant flow pump, prevents short circuits, and ensures the stable operation of the constant flow pump.
[0044] Furthermore, when it is necessary to install and disassemble the needle tube 3, first insert the disc seat 18 at the bottom edge of the needle tube 3 into the mounting seat 15, and at the same time, let the needle tube 3 pass through the limiting circular groove 17 in the fixed pressure plate 16. In this way, the bottom of the needle tube 3 can be initially limited by the mounting seat 15 and the fixed pressure plate 16. The mounting seat 15 and the fixed pressure plate 16 are locked and limited by the fastening bolt 19, which makes it easier to limit the needle tube 3 more stably, ensuring the stability of the needle tube 3 during constant flow infusion. This method also makes it easy to disassemble the needle tube 3, so as to facilitate its replacement and cleaning, making the maintenance of the constant flow pump more convenient.
[0045] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. High-precision constant-flow injection pump, comprising a housing (5), characterized in that: The top of the housing (5) is provided with a touch screen (1) embedded in the top, and two connecting valve seats (27) are symmetrically installed on the top front of the housing (5). The inner side of the connecting valve seat (27) is rotatably connected to a switching valve (2). The front of the housing (5) is fixedly installed with a mounting base (15) at the bottom position of the two switching valves (2), and the inner side of the mounting base (15) is detachably connected to a needle tube (3). A servo motor (9) is fixedly installed on one side of the inner side of the housing (5). A coupling (8) is connected to the bottom transmission end of the servo motor (9). A ball screw (6) is connected to the bottom power output end of the coupling (8). A slider (7) is connected to the outside of the ball screw (6) by a thread. A support seat (10) is fixedly connected to one end of the slider (7). A floating connector (4) is installed on the top of the support seat (10) at the bottom position of the needle tube (3). The shell (5) has a guide groove (11) on its side. The support base (10) slides along the guide groove (11). The inner side of the shell (5) is fixedly installed with a slider guide rail (12) by a support plate. The slider (7) slides along the slider guide rail (12). The bottom end of the switching valve (2) is connected to a connecting tube head (13), the top end of the needle tube (3) is connected to a top tube head (14), the inner side end of the connecting tube head (13) is provided with a circular fitting groove (20), and a compression deformation block (21) is tightly inserted into the fitting groove (20).
2. The high-precision constant-flow injection pump according to claim 1, characterized in that: The centers of the connecting tube (13), the top tube (14), the needle tube (3) and the floating connector (4) are all located on the same straight line in the vertical direction. The side of the switching valve (2) is connected to an injection catheter. The servo motor (9) is controlled by a controller.
3. The high precision constant flow infusion pump of claim 1, wherein: The extrusion deformation block (21) is made of natural rubber, and the inner side of the extrusion deformation block (21) is provided with an inclined groove. The top pipe (14) extrudes the extrusion deformation block (21) by the extrusion action, and the extrusion deformation block (21) is in close contact with the top pipe (14).
4. The high precision constant flow infusion pump of claim 1, wherein: The top of the mounting base (15) is provided with a fixing plate (16), the inside of the fixing plate (16) is provided with a limiting groove (17), and the bottom end of the needle tube (3) is fixedly connected with a disc seat (18). The needle tube (3) passes through the limiting groove (17), and the disc seat (18) at the bottom of the needle tube (3) is embedded in the inside of the mounting base (15). The mounting base (15) and the fixing plate (16) are connected by fastening bolts (19).
5. The high-precision constant flow injection pump according to claim 4, characterized in that: The top of the mounting base (15) is provided with a limiting groove, the disc base (18) is embedded in the limiting groove, and the edge of the needle tube (3) is fitted and connected to the inner wall of the limiting circular groove (17).
6. The high precision constant flow infusion pump of claim 1, wherein: A fan (22) is provided at the back end of the housing (5), and the fan (22) is embedded and connected to the inside of the housing (5) through the end plate (23) at its end. A collection box (24) is connected to the end of the end plate (23) on one side of the fan (22), and a sponge block (25) is embedded and connected to the inside of the collection box (24), and a drying bag (26) is embedded and connected to the inside of the sponge block (25).
7. The high precision constant flow infusion pump of claim 6, wherein: The outer side of the collection box (24) is provided with a cover plate, and the inner side of the cover plate is uniformly provided with through holes. The inside of the collection box (24) is provided with a cavity, and the sponge block (25) is tightly attached to the cavity.