CN-121987904-A - Method and system for qualitatively analyzing flow through front-rear temperature difference of heating pipeline

Abstract

The invention is suitable for the technical field of respiratory support equipment, and relates to a method and a system for qualitatively analyzing flow through front-rear temperature difference of a heating pipeline, wherein the method comprises the following steps of S10, acquiring a first temperature value T0 at an inlet of the heating pipeline and a second temperature value T1 at an outlet of the heating pipeline; S20, calculating a temperature difference delta T=T1-T0, S30, dividing the gas flow into a plurality of qualitative gears according to the relation between the temperature difference delta T and a preset threshold value, and S40, adjusting the heating power according to the qualitative gears. The flow of the gas in the pipeline is qualitatively judged by the temperature difference of the front temperature sensor and the rear temperature sensor of the heating breathing pipeline, so that the defect that the humidifier cannot actively acquire the flow is overcome.

Inventors

• DAI ZHENG
• ZHANG LINCHAO
• AI YANQIN

Assignees

• 湖南明康中锦医疗科技股份有限公司

Dates

Publication Date

20260508

Application Date

20251231

Claims (8)

1. 1. The method for qualitatively analyzing the flow through the temperature difference before and after the heating pipeline is characterized by comprising the following steps: s10, acquiring a first temperature value T0 at an inlet of a heating pipeline and a second temperature value T1 at an outlet of the heating pipeline; s20, calculating a temperature difference delta T=T1-T0; S30, dividing the gas flow into a plurality of qualitative gears according to the relation between the temperature difference delta T and a preset threshold value; and S40, adjusting heating power according to the qualitative gear.
2. 2. The method according to claim 1, wherein in S30, the qualitative gear comprises low flow rate, medium flow rate, high flow rate and ultra high flow rate.
3. 3. The method for qualitatively analyzing flow through temperature difference before and after heating pipeline according to claim 2, wherein each 20L/min is a section, 0-20L/min is low flow, 20-40L/min is medium flow, 40-60L/min is high flow, and 60L/min is super high flow.
4. 4. The method for qualitative analysis of flow rate by temperature difference before and after heating pipeline according to claim 1, wherein the preset threshold is obtained by experimental calibration or model calculation.
5. 5. The method for qualitative analysis of flow rate by temperature difference before and after heating line according to claim 1, wherein the formula of gas flow rate v is as follows: v=πkdh(Tw−2T0+T1)P Wherein k is a constant, d is the diameter of the heating pipeline, h is the convection heat transfer coefficient, tw is the wall temperature of the heating pipeline, and P is the convection heat transfer power through experimental calibration.
6. 6. A system employing the method of any one of claims 1 to 5, comprising: The first temperature sensor is arranged at the inlet of the heating pipeline; the second temperature sensor is arranged at the outlet of the heating pipeline; and the controller is used for receiving feedback values of the first temperature sensor and the second temperature sensor, calculating the temperature difference, judging the flow gear according to the temperature difference and adjusting the heating power.
7. 7. The system of claim 6, wherein the controller is further configured to dynamically adjust heating power based on a real-time flow gear to reduce condensed water or increase humidification efficiency.
8. 8. The system of the method of claim 6, wherein the system is integrated in a humidifier or a respiratory support device.

Description

Method and system for qualitatively analyzing flow through front-rear temperature difference of heating pipeline Technical Field The invention belongs to the technical field of respiratory support equipment, and particularly relates to a method and a system for qualitatively analyzing flow through front-rear temperature difference of a heating pipeline. Background Currently, humidifiers equipped with a warming breathing circuit are typically not equipped with a built-in flow sensor. Because of the limitation of the pipeline structure and the characteristics of the humidified gas, the humidifier is difficult to directly acquire the information of the gas flow in the pipeline. When being matched with different brands of respirators, the humidifier cannot acquire real-time flow data from the respirators. When the flow changes, the heating power is controlled by temperature feedback, so that the power is insufficient or too high, and further the problem of too much condensed water or insufficient humidification is caused. In the prior art, although a method for monitoring the temperature of a pipeline through a temperature sensor exists, most of the methods are only used for temperature control, qualitative judgment of flow based on temperature difference is not realized, and the problem of unstable humidification performance caused by flow change is not solved. The utility model provides a humidifier breathing pipeline heat preservation device is provided to publication number CN219375797U, including water heating device, peristaltic pump, warm water circulation hose, be used for right the temperature of warm water circulation hose carries out pipeline temperature monitoring module, host computer, warm water circulation hose with the form fixed connection of fifty percent discount in the pipeline temperature monitoring module, outside breathing pipeline block fixed connection in the pipeline temperature monitoring module, outside breathing pipeline both sides with warm water circulation hose contact, warm water circulation hose's one end with water heating device's delivery port is connected and switches on, warm water circulation hose's the other end with water heating device's water inlet is connected and switches on, the peristaltic pump is located water heating device's one side and is close to the delivery port, a part of warm water circulation hose imbeds in the peristaltic pump, the host computer is located the top of peristaltic pump, water heating device, peristaltic pump, pipeline temperature monitoring module all with the host computer electricity is connected. The humidifier in the patent application only realizes temperature monitoring, does not relate to qualitative judgment of flow, and has the same defects as the prior art. Therefore, how to provide a method for qualitatively judging the gas flow through the temperature difference between the front and the back of the heating pipeline is a problem to be solved by the person skilled in the art. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a method for qualitatively analyzing flow through the front-rear temperature difference of a heating pipeline, so as to solve the problem that the humidifier cannot realize qualitative judgment on the flow based on the temperature difference in the prior art, and the performance of the humidifier is unstable. In order to solve the technical problems, the invention adopts the following technical scheme: in a first aspect, the invention provides a method for qualitatively analyzing flow by temperature difference before and after a heating pipeline, comprising the following steps: s10, acquiring a first temperature value T0 at an inlet of a heating pipeline and a second temperature value T1 at an outlet of the heating pipeline; s20, calculating a temperature difference delta T=T1-T0; S30, dividing the gas flow into a plurality of qualitative gears according to the relation between the temperature difference delta T and a preset threshold value; and S40, adjusting heating power according to the qualitative gear. Further, in S30, the qualitative gear includes a low flow rate, a medium flow rate, a high flow rate, and an ultra-high flow rate. Further, every 20L/min is a zone, 0-20L/min is low flow, 20-40L/min is medium flow, 40-60L/min is high flow, and more than 60L/min is ultrahigh flow. Further, the preset threshold is obtained through experimental calibration or model calculation. Further, the formula of the gas flow velocity v is as follows: v=πkdh(Tw−2T0+T1)P Wherein k is a constant, d is the diameter of the heating pipeline, h is the convection heat transfer coefficient, tw is the wall temperature of the heating pipeline, and P is the convection heat transfer power through experimental calibration. In a second aspect, the present invention also provides a system for qualitatively analyzing flow through temperature difference before and after a heating pipeline,