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CN-122014553-A - Injection pump and rotary valve thereof

CN122014553ACN 122014553 ACN122014553 ACN 122014553ACN-122014553-A

Abstract

The invention relates to the field of fluid control equipment and discloses an injection pump and a rotary valve thereof, wherein the injection pump comprises a pump body, an injection assembly and a driving assembly, the injection assembly comprises a sleeve arranged on the pump body and a push rod capable of moving a piston in the sleeve, the driving assembly is in transmission connection with the push rod and is used for driving the push rod to move the piston, a rotary valve body is fixed on the pump body, and the rotary valve body comprises a rotary valve shell, and a syringe connecting hole and a plurality of connecting end holes which are communicated with the sleeve are formed in the rotary valve shell. Through servo motor drive, be connected with the screw rod transmission via band pulley and belt, drive the slide and carry out accurate linear movement on the slide bar parallel with the screw rod to a plurality of push rods that drive connect jointly on the slide carry out synchronous piston motion, thereby realized the multichannel synchronous imbibition of high accuracy and flowing back function, promoted work efficiency.

Inventors

  • WANG LIMING
  • LI YANJUN

Assignees

  • 保定思诺流体科技有限公司

Dates

Publication Date
20260512
Application Date
20260316

Claims (10)

  1. 1. A syringe pump, comprising: the pump comprises a pump body (1), wherein the pump body (1) comprises a vertical plate (101) and a transverse plate (102) for supporting; The pump body (1) is provided with a push rod (108) and a sleeve (110) matched with the push rod, and the push rod (108) can perform piston movement in the sleeve (110); The driving assembly comprises a servo motor (103) arranged on the pump body (1), a screw rod (104) in transmission connection with the servo motor (103), and a sliding seat (107) in threaded connection with the screw rod (104), wherein the sliding seat (107) is fixedly connected with the push rod (108); The controlled rotation of the screw (104) is used to convert a rotational movement into a linear movement of the slide (107) and to drive the push rod (108) into a piston movement with a preset displacement and speed. A rotary valve body (2) for integrating and switching a plurality of fluid passages.
  2. 2. A syringe pump according to claim 1, wherein the drive assembly further comprises a slide bar (106) fixed to the pump body (1), the slide bar (107) being slidably connected to the slide bar (106), the slide bar (106) being adapted to guide the linear movement of the slide bar (107) and to limit its rotation about the axis of the screw (104).
  3. 3. A syringe pump as claimed in claim 2, wherein the carriage (107) is fixedly connected to a plurality of pushers (108) by a plurality of connecting rods (109), the movement of the carriage (107) driving all pushers (108) in synchronism via the plurality of connecting rods (109).
  4. 4. A syringe pump according to claim 3, characterized in that the pump body (1) is provided with grooves for guiding a plurality of connecting rods (109), the connecting rods (109) being slidably arranged in the grooves, the grooves being for constraining the movement path of the connecting rods (109).
  5. 5. A syringe pump according to claim 1, characterized in that the output of the servomotor (103) is in flexible drive connection with the screw (104) via a pulley (105) and a belt, the flexible drive connection being adapted to buffer vibrations and shocks occurring when the servomotor (103) is started and stopped while transmitting power.
  6. 6. A rotary valve for use with a syringe pump according to any one of claims 1 to 5, comprising: A rotary valve body (2), wherein a syringe connecting hole (209) and a plurality of connecting end holes (204) for the external fluid pipeline to be connected are arranged in the rotary valve body (2); a rotary valve core (210) rotatably arranged in the rotary valve body (2), wherein a reversing channel (211) is formed in the rotary valve core (210); and a stepper motor (4), wherein the stepper motor (4) drives the rotary valve core (210) to rotate to a preset angle, so that the reversing channel (211) is communicated with a flow path between the syringe connecting hole (209) and a selected connecting end hole (204).
  7. 7. A rotary valve according to claim 6, wherein the rotary valve body (2) further comprises a rotary valve housing (201), a rotary hole (202) for the rotary valve core (210) to rotate is formed in the rotary valve housing (201), a rotary shaft (212) is fixedly connected to a side wall of the rotary valve core (210), and an output end of the stepper motor (4) is fixedly connected with the rotary shaft (212).
  8. 8. A rotary valve according to claim 7, characterized in that the rotary valve body (2) further comprises a support (3) for the fixed stepper motor (4), the support (3) being fixedly connected to the pump body (1).
  9. 9. A rotary valve according to claim 6, characterized in that the rotary valve body (2) is provided at the top with a first communication hole (205), a second communication hole (206), a third communication hole (207) and a fourth communication hole (208), the side walls of which are provided with connection end holes (204) corresponding to the communication holes, and the rotary valve body (2) is internally provided with a connection flow passage (203) for communicating the connection end holes (204) with the corresponding communication holes.
  10. 10. A rotary valve according to claim 6, characterized in that the side wall of the rotary valve core (210) is in close contact with the inner wall of the rotary valve body (2) to form a dynamic sealing engagement.

Description

Injection pump and rotary valve thereof Technical Field The invention relates to the field of fluid control equipment, in particular to an injection pump and a rotary valve thereof. Background As a core component for realizing accurate delivery and control of trace liquid, the injection pump plays an indispensable role in the fields of high precision such as medical examination, biological pharmacy, chemical analysis, environmental monitoring and the like. In these application scenarios, stringent requirements are put on high-precision inhalation, high-efficiency transfer and accurate distribution of liquid, and meanwhile, strict avoidance of cross contamination between samples is a fundamental premise for ensuring accurate and reliable experimental or analysis results. However, as technology advances, mass, high throughput processing tasks become increasingly popular, and existing syringe pump technology exposes several deficiencies of the prior art in addressing these needs. First, in performing multi-channel or batch processing tasks, conventional approaches often provide each channel with an independent drive unit. The design not only causes huge overall structure of the equipment and complex system integration, but also significantly increases the manufacturing cost and the subsequent maintenance difficulty. More critical, accurate synchronization and consistency are difficult to achieve among a plurality of independent driving units, tiny differences in operation accumulate, uniformity and reliability of batch processing can be directly affected, and secondly, in the implementation of flow path switching, the traditional pipeline and valve combination mode has inherent defects. The mode often generates larger dead volume due to structural limitation, which not only reduces the precision of micro-distribution, but also brings trouble to thorough cleaning and sterilization of the pipeline. Disclosure of Invention Aiming at the defects of the prior art, the invention provides an injection pump and a rotary valve thereof, and solves the problems that in the prior art, multi-channel injection equipment has complex structure, high cost and poor synchronism due to a plurality of driving units, and liquid leakage and cross contamination are easy to cause due to inaccurate positioning or inaccurate sealing in a traditional flow path switching mode, so that the distribution precision is influenced. A syringe pump, comprising: the pump body comprises a vertical plate and a transverse plate for supporting, a stable installation foundation is provided for the whole pump system, and stability and accuracy of each moving part in the running process are ensured; the pump body is provided with a push rod and a sleeve matched with the push rod, the push rod can move in the sleeve, and the accurate suction and discharge of fluid in the injector can be realized through the accurate matching of the push rod and the sleeve; the driving assembly comprises a servo motor arranged on the pump body, a screw rod in transmission connection with the servo motor, and a sliding seat in threaded connection with the screw rod, wherein the sliding seat is fixedly connected with the push rod, and the motion speed and displacement of the push rod can be accurately controlled by utilizing the high-precision control characteristic of the servo motor, so that the extremely high flow precision and stability of the injection pump are ensured; the controlled rotation of the screw is used for converting the rotary motion into the linear motion of the sliding seat and driving the push rod to perform the piston motion with preset displacement and speed. The rotary valve body is used for integrating and switching a plurality of fluid channels, and through integrating the rotary valve, the injection pump can automatically switch different liquid passages without reinserting and pulling the pipeline, so that the automation degree and convenience of an experiment or production flow are greatly improved. Preferably, the driving assembly further comprises a sliding rod fixed on the pump body, the sliding seat is slidably connected on the sliding rod, the sliding rod is used for guiding the linear motion of the sliding seat and limiting the sliding seat to rotate around the axis of the screw rod, the sliding seat is effectively prevented from deflecting or shaking in the motion, the push rod is ensured to stably move along the linear direction all the time, and the transmission stability and the repeated positioning precision are improved. Preferably, the sliding seat is correspondingly and fixedly connected with the plurality of push rods through the plurality of connecting rods, and the motion of the sliding seat synchronously drives all the push rods to move through the plurality of connecting rods, so that the synchronous operation of single motor driving multiple channels is realized, the cost and the space are saved, and the high consistency and t