CN-117028218-B - Peristaltic pump backflow prevention control method

CN117028218BCN 117028218 BCN117028218 BCN 117028218BCN-117028218-B

Abstract

The application relates to a peristaltic pump backflow prevention control method, which comprises the following steps of obtaining a current flow value and a current flow direction at an outlet of a pump body assembly; the peristaltic pump backflow prevention control method is used for judging whether the pump body assembly is in liquid backflow or not by detecting the liquid flow at the outlet of the pump body assembly in real time, when the pump body assembly is in liquid backflow in a stop state, the pump body assembly can be controlled to convey liquid to the outlet, so that the liquid in multiple conveyers can offset the backflow, when the pump body assembly is in liquid backflow in an operation state, the liquid flow at the outlet of the pump body assembly can be regulated by regulating the rotating speed of the pump body assembly, the actual flow at the outlet of the pump body assembly is matched with a preset value, the expected outlet flow is realized, and the problem of liquid backflow of the pump body assembly in the operation state is solved.

Inventors

LIU CHUNJIANG
ZHANG ZHEN

Assignees

苏州恒瑞宏远医疗科技有限公司

Dates

Publication Date: 20260505
Application Date: 20230816

Claims (9)

1. The peristaltic pump backflow prevention control method is characterized by comprising the following steps of: acquiring a current flow value and a current flow direction at an outlet of the pump body assembly; controlling the pump body assembly according to the current flow value and the flow direction and the expected flow of the pump body assembly in the current working state; the controlling the pump body assembly according to the current flow value and the flow direction and the expected flow of the pump body assembly in the current working state comprises the following steps: When the pump body assembly is in a stop state, if the current flow value is greater than 0 and the fluid flow direction is from an outlet to an inlet, controlling the pump body assembly to convey fluid to the outlet, wherein the flow value of the conveyed fluid is equal to the current flow value; and under the condition that the pump body assembly is in an operating state, controlling the rotating speed of the pump body assembly according to the current flow value and a set flow value of the pump body assembly in the current operating state so as to adjust the current flow value to be consistent with the set flow value.
2. The peristaltic pump backflow prevention control method of claim 1, wherein controlling the rotational speed of the pump assembly according to the current flow value and a set flow value of the pump assembly in the current operation state when the pump assembly is in the operation state, to adjust the current flow value to be consistent with the set flow value, comprises: Controlling the pump body component to increase the rotating speed until the current flow value is consistent with the set flow value under the condition that the current flow value is smaller than the set flow value; And under the condition that the current flow value is larger than the set flow value, controlling the pump body component to reduce the rotating speed until the current flow value is consistent with the set flow value.
3. The method of claim 1, wherein the obtaining the current flow value and flow direction at the outlet of the pump body assembly comprises: Acquiring a real measurement flow value at intervals of a first preset time; and calculating the average value of a plurality of actually measured flow values in the period of one circle of rotation of the pump head of the pump body assembly, and obtaining the current flow value.
4. The method of claim 1, wherein the obtaining the current flow value and flow direction at the outlet of the pump body assembly comprises: acquiring the current flow value and the current flow direction through a non-contact flow sensor; the pump body assembly is provided with a flexible pump pipe, the flexible pump pipe is provided with a water inlet part and a water outlet part, and the non-contact flow sensor is arranged on the water outlet part.
5. The peristaltic pump backflow prevention control method of any one of claims 1 to 4, further comprising: Acquiring a liquid pressure value at an outlet of the pump body assembly; And maintaining or reducing the rotating speed of the pump body assembly under the condition that the liquid pressure value reaches a set pressure value.
6. The method of claim 5, wherein the set pressure value is less than or equal to a rated pressure of the pump body assembly.
7. The method of claim 5, wherein the obtaining a value of the fluid pressure at the outlet of the pump body assembly comprises: obtaining an actual measurement pressure value at intervals of a second preset time; And calculating the average value of a plurality of measured pressure values in a period of one rotation of the pump head of the pump body assembly so as to obtain the liquid pressure value.
8. The method of claim 5, wherein the obtaining a value of the fluid pressure at the outlet of the pump body assembly comprises: Acquiring the liquid pressure value through a non-contact pressure sensor; the pump body assembly is provided with a flexible pump pipe, the flexible pump pipe is provided with a water inlet part and a water outlet part, and the non-contact pressure sensor is arranged on the water outlet part.
9. The peristaltic pump anti-reflux control method of claim 5, the peristaltic pump backflow prevention control method is characterized by further comprising the following steps: obtaining an actual measurement rate value of the pump body assembly; and maintaining or reducing the rotating speed of the pump body assembly under the condition that the actual measured speed value reaches a set speed value.

Description

Peristaltic pump backflow prevention control method Technical Field The application relates to the technical field of peristaltic pumps, in particular to a peristaltic pump backflow prevention control method. Background Peristaltic pump is a positive displacement pump which uses the method of squeezing elastic hose to push the gas or liquid in the tube forward, and uses the partial vacuum formed when the hose is elastically restored to suck the liquid or gas behind, and pumps the gas or liquid by alternately squeezing and releasing the elastic hose. However, in the running process of the peristaltic pump, the rubber tube is not completely sealed due to insufficient pressing force, so that the situation of liquid backflow occurs easily. In addition, if the peristaltic pump cannot guarantee the pressing state of the elastic hose in the stop state, liquid backflow can be generated. At present, aiming at the problem of liquid backflow of a peristaltic pump, a mode of adding a one-way valve or a mode of changing the appearance of a top block to increase the extrusion deformation of an elastic hose is mostly adopted. But the check valve can only solve the reflux problem of peristaltic pump under the shut down state, and the mode of increasing the extrusion deflection of elastic hose can increase the risk of elastic hose loss, influences peristaltic pump's life. Disclosure of Invention Based on the above, it is necessary to provide a peristaltic pump backflow prevention control method for solving the problem that the peristaltic pump is easy to generate liquid backflow under the running and shutdown states. A peristaltic pump backflow prevention control method comprises the following steps: acquiring a current flow value and a current flow direction at an outlet of the pump body assembly; And controlling the pump body assembly according to the current flow value and the flow direction and the expected flow of the pump body assembly in the current working state. In one embodiment, the controlling the pump body assembly according to the current flow value and flow direction and the expected flow of the pump body assembly in the current working state includes: When the pump body assembly is in a stop state, if the current flow value is greater than 0 and the fluid flow direction is from an outlet to an inlet, controlling the pump body assembly to convey fluid to the outlet, wherein the flow value of the conveyed fluid is equal to the current flow value; and under the condition that the pump body assembly is in an operating state, controlling the rotating speed of the pump body assembly according to the current flow value and a set flow value of the pump body assembly in the current operating state so as to adjust the current flow value to be consistent with the set flow value. In one embodiment, when the pump body assembly is in the running state, the controlling the rotation speed of the pump body assembly according to the current flow value and the set flow value of the pump body assembly in the current running state to adjust the current flow value to be consistent with the set flow value includes: Controlling the pump body component to increase the rotating speed until the current flow value is consistent with the set flow value under the condition that the current flow value is smaller than the set flow value; and under the condition that the current precursor flow value is larger than the set flow value, controlling the pump body assembly to reduce the rotating speed until the current flow value is consistent with the set flow value. In one embodiment, the obtaining the current flow value and flow direction at the outlet of the pump body assembly includes: Acquiring a real measurement flow value at intervals of a first preset time; and calculating the average value of a plurality of actually measured flow values in the period of one circle of rotation of the pump head of the pump body assembly, and obtaining the current flow value. In one embodiment, the obtaining the current flow value and flow direction at the outlet of the pump body assembly includes: acquiring the current flow value and the current flow direction through a non-contact flow sensor; the pump body assembly is provided with a flexible pump pipe, the flexible pump pipe is provided with a water inlet part and a water outlet part, and the non-contact flow sensor is arranged on the water outlet part. In one embodiment, the peristaltic pump backflow prevention control method further comprises: Acquiring a liquid pressure value at an outlet of the pump body assembly; And maintaining or reducing the rotating speed of the pump body assembly under the condition that the liquid pressure value reaches a set pressure value. In one embodiment, the set pressure value is less than or equal to a rated pressure of the pump body assembly. In one embodiment, the acquiring the liquid pressure value at the outlet of the pump body assembly includes: obtaining an act