Injection pump and rotary valve thereof

Abstract

The invention relates to the field of fluid control equipment, and discloses an injection pump and a rotary valve thereof.The injection pump comprises a pump body, an injection assembly and a rotary valve body, the injection assembly comprises a sleeve arranged on the pump body and a push rod capable of conducting piston motion in the sleeve, and the drive assembly is in transmission connection with the push rod and used for driving the push rod to conduct piston motion; the rotary valve body is fixed to the pump body and comprises a rotary valve shell, and an injector connecting hole communicated with the sleeve and a plurality of connecting end holes are formed in the rotary valve shell. The multi-channel synchronous liquid suction and drainage device is driven by the servo motor and is in transmission connection with the screw rod through the belt wheel and the belt to drive the sliding seat to perform accurate linear movement on the sliding rod parallel to the screw rod, so that the plurality of push rods jointly connected to the sliding seat are driven to perform synchronous piston movement, the high-precision multi-channel synchronous liquid suction and drainage functions are realized, and the working efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of fluid control equipment, specifically to an injection pump and its rotary valve. Background Technology

[0002] As a core component for the precise delivery and control of micro-volume liquids, syringe pumps play an indispensable role in high-precision fields such as medical testing, biopharmaceuticals, chemical analysis, and environmental monitoring. These applications place stringent demands on the high-precision aspiration, efficient transfer, and accurate dispensing of liquids. Simultaneously, strictly avoiding cross-contamination between samples is a fundamental prerequisite for ensuring the accuracy and reliability of experimental or analytical results.

[0003] However, with technological advancements, high-throughput, batch processing tasks are becoming increasingly common, and existing syringe pump technology has revealed several shortcomings in addressing these demands. Firstly, when performing multi-channel or batch processing tasks, traditional solutions often equip each channel with an independent drive unit. This design not only results in a bulky overall equipment structure and complex system integration but also significantly increases manufacturing costs and subsequent maintenance difficulties. More importantly, it is difficult to achieve precise synchronization and consistency between multiple independent drive units; the accumulation of minor operational differences directly affects the uniformity and reliability of batch processing. Secondly, traditional piping and valve combinations have inherent flaws in achieving flow path switching. This method often results in a large dead volume due to structural limitations, which not only reduces the accuracy of micro-dispensing but also complicates the thorough cleaning and sterilization of the piping. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an injection pump and its rotary valve, which solves the problems of complex structure, high cost, and poor synchronization in existing multi-channel injection devices due to numerous drive units, as well as the problems of liquid leakage and cross-contamination caused by inaccurate positioning or poor sealing in traditional flow path switching methods, thus affecting the dispensing accuracy.

[0005] An infusion pump, comprising:

[0006] The pump body includes vertical and horizontal plates for support, providing a stable installation foundation for the entire pump system and ensuring the stability and accuracy of each moving part during operation.

[0007] The pump body is equipped with a push rod and a sleeve that cooperates with it. The push rod can perform piston movement inside the sleeve. Through the precise cooperation between the push rod and the sleeve, the fluid in the syringe can be accurately drawn in and discharged.

[0008] The drive assembly includes a servo motor mounted on the pump body, a screw connected to the servo motor, and a slide threaded onto the screw. The slide is fixedly connected to the push rod. By utilizing the high-precision control characteristics of the servo motor, the movement speed and displacement of the push rod can be precisely controlled, thereby ensuring the extremely high flow accuracy and stability of the injection pump.

[0009] The controlled rotation of the screw is used to convert the rotational motion into the linear motion of the slide, and to drive the push rod to perform piston motion with a preset displacement and speed.

[0010] The rotary valve body is used to integrate and switch multiple fluid channels. By integrating the rotary valve, the injection pump can automatically switch between different liquid paths without reconnecting the tubing, which greatly improves the automation and convenience of experimental or production processes.

[0011] Preferably, the drive assembly further includes a slide rod fixed to the pump body, and the slide block is slidably connected to the slide rod. The slide rod is used to guide the linear motion of the slide block and restrict its rotation around the screw axis, effectively preventing the slide block from deflecting or shaking during movement, ensuring that the push rod always moves stably in a straight line, and improving the smoothness of transmission and repeatability of positioning accuracy.

[0012] Preferably, the slide is fixedly connected to multiple push rods via multiple connecting rods. The movement of the slide drives all push rods to move synchronously via multiple connecting rods, realizing the synchronous operation of multiple channels driven by a single motor. This not only saves cost and space, but also ensures a high degree of consistency and synchronization when multiple channels are performing sampling or taking samples.

[0013] Preferably, the pump body has grooves for guiding multiple connecting rods. The connecting rods are slidably disposed in the grooves. The grooves constrain the movement trajectory of the connecting rods. The grooves provide additional support and guidance for the connecting rods, further enhancing the stability of the multi-channel push rod movement and preventing interference or misalignment during the movement.

[0014] Preferably, the output end of the servo motor is flexibly connected to the screw via a pulley and a belt. This flexible transmission connection is used to buffer the vibration and impact generated when the servo motor starts and stops while transmitting power. The flexible transmission method protects precision components such as the screw and servo motor, extends the service life of the equipment, and reduces operating noise.

[0015] A rotary valve, comprising:

[0016] The rotary valve body is provided with a syringe connection hole and multiple connection end holes for external fluid pipelines. The valve body integrates multiple fluid pipelines into one unit, providing a centralized physical interface for fluid distribution, collection or switching.

[0017] A rotary valve core is rotatably disposed within the rotary valve body, and a reversing channel is provided inside the rotary valve core;

[0018] A stepper motor drives the rotary valve core to rotate to a predetermined angle, so that the reversing channel establishes a flow path connection between the syringe connection hole and a selected connection end hole. By utilizing the stepper motor's ability to control the rotation angle, the valve passage can be switched quickly, accurately, and repeatably automatically, avoiding the errors and tediousness of manual operation.

[0019] Preferably, the rotary valve body further includes a rotary valve housing, on which a rotary hole is provided for the rotary valve core to rotate. A rotary shaft is fixedly connected to the side wall of the rotary valve core, and the output end of the stepper motor is fixedly connected to the rotary shaft, ensuring that the driving torque of the stepper motor can be directly transmitted to the valve core without deviation, and ensuring that the valve core can rotate accurately to the preset position each time.

[0020] Preferably, the rotary valve body further includes a bracket for fixing the stepper motor, the bracket being fixedly connected to the pump body.

[0021] Preferably, the top of the rotary valve body is provided with a first connecting hole, a second connecting hole, a third connecting hole, and a fourth connecting hole, and its side wall is provided with connecting end holes corresponding to the multiple connecting holes, and the inside of the rotary valve body is provided with a connecting flow channel for connecting the connecting end holes and the corresponding connecting holes.

[0022] Preferably, the sidewall of the rotary valve core is tightly fitted with the inner wall of the rotary valve body to form a dynamic seal, preventing liquid leakage and cross-contamination. This ensures that even during the rotation and switching of the valve core, good sealing is maintained between different channels, guaranteeing the accuracy of fluid analysis or reaction.

[0023] This invention provides an injection pump and its rotary valve. It has the following beneficial effects:

[0024] 1. This invention is driven by a servo motor, which is connected to the screw drive via pulleys and belts. This drives the slide to move precisely linearly on the slide rod parallel to the screw, thereby driving multiple push rods connected to the slide to perform synchronous piston movement. This achieves high-precision multi-channel synchronous liquid suction and discharge functions, improving work efficiency.

[0025] 2. This invention drives a stepper motor to rotate the rotary valve core inside the rotary valve housing. By utilizing the reversing channel on the rotary valve core, the syringe connection hole can be selectively connected to different connection end holes, thereby achieving precise and rapid switching of the flow path and effectively preventing liquid leakage and cross-contamination. Attached Figure Description

[0026] Figure 1 This is a perspective view of the present invention;

[0027] Figure 2 This is a schematic diagram of the rear three-dimensional structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the driving component of the present invention;

[0029] Figure 4 This is a schematic diagram of the rotary valve body of the present invention;

[0030] Figure 5 This is a schematic diagram of the separation structure of the rotary valve core and the rotary valve housing of the present invention;

[0031] Figure 6 This is a schematic diagram of the rotary valve core of the present invention;

[0032] Figure 7 This is a schematic diagram of the rotary valve housing of the present invention;

[0033] Figure 8 This is a schematic diagram of the internal passage of the rotary valve housing of the present invention.

[0034] The components include: 1. Pump body; 101. Vertical plate; 102. Horizontal plate; 103. Servo motor; 104. Screw; 105. Pulley; 106. Slide rod; 107. Slide seat; 108. Push rod; 109. Connecting rod; 110. Sleeve; 2. Rotary valve body; 201. Rotary valve housing; 202. Rotation hole; 203. Connecting flow channel; 204. Connecting end hole; 205. Connecting hole one; 206. Connecting hole two; 207. Connecting hole three; 208. Connecting hole four; 209. Injector connecting hole; 210. Rotary valve core; 211. Reversing channel; 212. Rotating shaft; 3. Support; 4. Stepper motor. Detailed Implementation

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see the appendix Figure 1 - Appendix Figure 8 This invention provides an injection pump and its rotary valve, comprising: a pump body 1, which serves as the mounting base for the entire device and is composed of an upright plate 101 and a horizontal plate 102 connected by bolts to form an L-shaped structure. This layout not only makes the overall structure more compact but also effectively isolates the electromechanical parts responsible for driving from the parts responsible for fluid handling, facilitating installation and maintenance; an injection assembly, which includes a sleeve 110 disposed on the pump body 1 and a push rod 108 capable of piston movement within the sleeve 110; and a drive assembly, which is convexly connected to the push rod 108 to drive the push rod 108 to perform piston movement. The use of a single drive assembly enables synchronous operation of multiple channels, significantly simplifying the structure, reducing costs, and fundamentally ensuring the synchronicity and consistency of liquid suction and discharge actions in each channel.

[0037] The drive assembly includes: a servo motor 103 mounted on the pump body 1, which is fixed to the horizontal plate 102 of the pump body 1 via mounting holes and bolts on its base. The servo motor 103 is a widely used power component in industrial automation; for example, the IS620P series servo motor from Huichuan Technology can be used to provide high-precision rotational power and position control. This is existing technology and will not be elaborated further here. The servo motor 103 can control speed and angle, providing a power source for injection. The output shaft of the servo motor 103 is keyed to a pulley 105, and one end of the screw 104 is also keyed to another pulley 105. The servo motor 103, in conjunction with the pulleys 105 and belt, provides flexible transmission, thereby driving the screw 104 to rotate. The flexible connection helps absorb and buffer minor vibrations, making power transmission smoother. A slide 107, threaded with the screw 104 and connected to the push rod 108, is also included. When the servo motor 103 drives the screw 104 to rotate... The slide 107 moves linearly along the axial direction of the screw 104, thereby driving the push rod 108 to perform precise reciprocating linear motion. A slide rod 106 parallel to the screw 104 is also fixedly installed on the pump body 1. The slide 107 is slidably connected to the slide rod 106, which can effectively prevent the slide 107 from rotating during movement, ensuring the smoothness and uniqueness of the movement, thereby improving the repeatability and accuracy of injection. The servo motor 103 is connected to the screw 104 by a belt and pulley 105. There are multiple injection components. Multiple push rods 108 are connected to the slide 107 of the drive component through at least one connecting rod 109. The connecting rod 109 is used to synchronously transmit the linear motion of a single slide 107 to multiple push rods 108, thereby realizing synchronous injection or aspiration of multiple channels through a single drive source. This not only greatly simplifies the structure and reduces costs, but also fundamentally ensures the synchronicity and consistency of each channel in aspiration and drainage actions, improving work efficiency.

[0038] The rotary valve body 2, bolted to the side wall of the upright plate 101 of the pump body 1, serves as the core component for multi-channel fluid distribution and switching. The rotary valve body 2 includes: a rotary valve housing 201 with a syringe connection hole 209 communicating with the sleeve 110 and multiple connection end holes 204; and a rotary valve core 210 rotatably disposed within the rotary valve housing 201, which has a reversing channel 211. The reversing channel 211 selectively connects the syringe connection hole 209 to any of the connection end holes 204 through the rotation of the rotary valve core 210, thereby controlling the flow of liquid between different channels. The switching mechanism is a rotary drive mechanism, which is connected to the rotary valve core 210 to drive the rotary valve core 210 to rotate. A rotary hole 202 is provided inside the rotary valve housing 201, and a rotary shaft 212 is provided inside the rotary valve core 210. This rotary shaft 212 is rotatably connected to the rotary hole 202. The rotary drive mechanism is a stepper motor 4. The stepper motor 4 can achieve precise step control of the valve core rotation angle by controlling the number and frequency of pulse signals. By controlling the input pulse signals, precise step control of the valve core rotation angle can be achieved, ensuring alignment between the reversing channel 211 and the target hole position, and avoiding misalignment. To prevent changes in flow resistance or obstruction of the flow path caused by the standard, its output end is fixedly connected to the rotating shaft 212 via a coupling to ensure reliable torque transmission and synchronous rotation. A bracket 3 is fixedly connected to the side wall of the pump body 1, and the stepper motor 4 is mounted on the bracket 3, providing a stable mounting base for the stepper motor 4. The rotary valve housing 201 is also provided with a connecting flow channel 203 communicating with the syringe connection hole 209. The rotary valve housing 201 is also provided with connecting holes 1 205, 206, 207, and 208, which are respectively connected to the corresponding connecting end holes 204 through channels. This forms a complete and non-interfering fluid passage. The side wall of the rotary valve core 210 and the inner wall of the rotary valve housing 201 are in a tight dynamic seal fit. The rotary valve core 210 rotates in conjunction with the rotary valve housing 201. By changing the alignment relationship between the reversing channel 211 and each connecting end hole 204, the fluid passage is selectively switched, forming a dynamic sealing barrier. This ensures that when the valve core rotates to switch the flow path, the liquid between different channels will not leak or cross-contaminate, thus ensuring the accuracy and cleanliness of fluid distribution. The pump body 1 includes a vertical plate 101 and a horizontal plate 102.

[0039] Working principle: When using this device, the stepper motor 4 is started to drive the rotary valve core 210 to rotate to the liquid aspiration position. At this time, the internal reversing channel 211 connects the external connection end hole 204 with the syringe connection hole 209, thereby establishing two independent liquid aspiration flow paths. Then, the servo motor 103 of the drive component is started, and the screw 104 and the slide 107 drive the push rod 108 to move backward to perform piston movement, synchronously drawing external liquid into the injection component. After the liquid aspiration is completed, the stepper motor 4 is started again to rotate the rotary valve core 210 to the liquid discharge position, switching the connection of the reversing channel 211 to connect the syringe connection hole 209 with the connection end hole 204, which serves as the liquid discharge port. Subsequently, the servo motor 103 rotates in the opposite direction and drives the push rod 108 forward, synchronously discharging the liquid in the injection component through the newly established liquid discharge flow path.

Claims

1. An injection pump, characterized in that, include: Pump body (1), the pump body (1) includes a vertical plate (101) and a horizontal plate (102) for support. The pump body (1) is provided with a push rod (108) and a sleeve (110) that cooperates with it. The push rod (108) can perform piston movement inside the sleeve (110). The drive assembly includes a servo motor (103) mounted on the pump body (1), a screw (104) drivenly connected to the servo motor (103), and a slide (107) threadedly connected to the screw (104), the slide (107) being fixedly connected to the push rod (108); The controlled rotation of the screw (104) is used to convert the rotational motion into the linear motion of the slide (107) and drive the push rod (108) to perform piston motion with a preset displacement and speed. Rotary valve body (2), which is used for the integration and switching of multiple fluid channels.

2. The syringe pump according to claim 1, characterized in that, The drive assembly also includes a slide rod (106) fixed on the pump body (1), and a slide block (107) slidably connected to the slide rod (106). The slide rod (106) is used to guide the linear motion of the slide block (107) and restrict its rotation about the axis of the screw (104).

3. The syringe pump according to claim 2, characterized in that, The slide (107) is fixedly connected to the push rods (108) via multiple connecting rods (109), and the movement of the slide (107) synchronously drives all the push rods (108) to move via the multiple connecting rods (109).

4. The syringe pump according to claim 3, characterized in that, The pump body (1) has a groove for guiding multiple connecting rods (109). The connecting rods (109) are slidably disposed in the groove, and the groove is used to constrain the movement trajectory of the connecting rods (109).

5. The syringe pump according to claim 1, characterized in that, The output end of the servo motor (103) and the screw (104) are flexibly connected by a pulley (105) and a belt. The flexible transmission connection is used to buffer the vibration and impact generated when the servo motor (103) starts and stops while transmitting power.

6. A rotary valve, applied to an injection pump according to any one of claims 1-5, characterized in that, include: The rotary valve body (2) is provided with a syringe connection hole (209) and multiple connection end holes (204) for external fluid pipeline access. Rotary valve core (210) is rotatably disposed inside the rotary valve body (2), and a reversing channel (211) is provided inside the rotary valve core (210). A stepper motor (4) drives the rotary valve core (210) to rotate to a predetermined angle so that the reversing channel (211) establishes a flow path connection between the syringe connection hole (209) and a selected connection end hole (204).

7. A rotary valve according to claim 6, characterized in that, The rotary valve body (2) also includes a rotary valve housing (201), on which a rotary hole (202) is provided for the rotary valve core (210) to rotate. A rotary shaft (212) is fixedly connected to the side wall of the rotary valve core (210), and the output end of the stepper motor (4) is fixedly connected to the rotary shaft (212).

8. A rotary valve according to claim 7, characterized in that, The rotary valve body (2) also includes a bracket (3) for fixing the stepper motor (4), which is fixedly connected to the pump body (1).

9. A rotary valve according to claim 6, characterized in that, The top of the rotary valve body (2) is provided with a first connecting hole (205), a second connecting hole (206), a third connecting hole (207) and a fourth connecting hole (208), and its side wall is provided with a connecting end hole (204) corresponding to the multiple connecting holes. The rotary valve body (2) is provided with a connecting flow channel (203) for connecting the connecting end hole (204) and the corresponding connecting hole.

10. A rotary valve according to claim 6, characterized in that, The side wall of the rotary valve core (210) is tightly fitted with the inner wall of the rotary valve body (2) to form a dynamic sealing fit.

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