Method and system for qualitatively analyzing flow through temperature difference before and after pipeline heating

Abstract

The invention is suitable for the technical field of respiratory support equipment, and relates to a method and system for qualitatively analyzing flow through the temperature difference before and after a heating pipeline, and the method comprises the following steps: S10, obtaining a first temperature value T0 at the inlet of the heating pipeline and a second temperature value T1 at the outlet of the heating pipeline; s20, the temperature difference delta T is calculated according to the formula: delta T = T1-T0; s30, the gas flow is divided into a plurality of qualitative gears according to the relation between the temperature difference delta T and a preset threshold value; and S40, the heating power is adjusted according to the qualitative gear. The method is simple in process and convenient to operate, the gas flow in the pipeline is qualitatively judged according to the temperature difference between the front temperature sensor and the rear temperature sensor of the heating breathing pipeline, and therefore the defect that the humidifier cannot actively obtain the flow is overcome.

Description

Technical Field

[0001] This invention belongs to the technical field of respiratory support equipment, and in particular relates to a method and system for qualitatively analyzing flow rate by means of the temperature difference before and after the heating pipeline. Background Technology

[0002] Currently, humidifiers equipped with heated breathing tubing typically lack built-in flow sensors. Due to limitations in tubing structure and the characteristics of the humidified gas, humidifiers cannot directly obtain gas flow information within the tubing. When used with ventilators from different brands, the humidifier cannot obtain real-time flow data from the ventilator. When flow changes, relying solely on temperature feedback to control heating power can easily lead to insufficient or excessive power, resulting in excessive condensation or inadequate humidification. While existing technologies include methods for monitoring tubing temperature using temperature sensors, most are only used for temperature control and do not achieve qualitative judgment of flow based on temperature difference, nor do they solve the problem of unstable humidification performance caused by flow changes.

[0003] Patent application CN219375797U discloses a humidifier breathing tubing insulation device, including a water heating device, a peristaltic pump, a warm water circulation hose, a tubing temperature monitoring component for monitoring the temperature of the warm water circulation hose, and a main unit. The warm water circulation hose is fixedly connected to the tubing temperature monitoring component in a folded shape. An external breathing tubing is snapped and fixedly connected to the tubing temperature monitoring component, with both sides of the external breathing tubing in contact with the warm water circulation hose. One end of the warm water circulation hose is connected and conductive to the outlet of the water heating device, and the other end is connected and conductive to the inlet of the water heating device. The peristaltic pump is located on one side of the water heating device and close to the outlet. A portion of the warm water circulation hose is embedded in the peristaltic pump. The main unit is located above the peristaltic pump. The water heating device, peristaltic pump, and tubing temperature monitoring component are all electrically connected to the main unit. This patent application only implements temperature monitoring for the humidifier and does not address flow rate qualitative judgment, exhibiting the same drawbacks as existing technologies.

[0004] Therefore, how to provide a method for qualitatively determining the gas flow rate by the temperature difference before and after the heating pipeline is a problem that urgently needs to be solved by those in this technical field. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a method for qualitatively analyzing flow rate based on the temperature difference before and after a heating pipeline, thereby solving the problem that humidifiers in the prior art cannot achieve qualitative judgment of flow rate based on temperature difference, leading to unstable humidifier performance. In addition, this invention also provides a system for qualitatively analyzing flow rate based on the temperature difference before and after a heating pipeline.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a method for qualitatively analyzing flow rate by means of the temperature difference before and after a heated pipeline, comprising the following steps:

[0008] S10. Obtain the first temperature value T0 at the inlet of the heating pipeline and the second temperature value T1 at the outlet;

[0009] S20. Calculate the temperature difference ΔT = T1 - T0;

[0010] S30. Based on the relationship between the temperature difference ΔT and the preset threshold, the gas flow rate is divided into multiple qualitative levels;

[0011] S40. Adjust the heating power according to the qualitative setting.

[0012] Furthermore, in S30, the qualitative levels include low flow rate, medium flow rate, high flow rate, and ultra-high flow rate.

[0013] Furthermore, each 20L / min is considered a flow rate interval: 0-20L / min is low flow rate, 20-40L / min is medium flow rate, 40-60L / min is high flow rate, and above 60L / min is ultra-high flow rate.

[0014] Furthermore, the preset threshold is obtained through experimental calibration or model calculation.

[0015] Furthermore, the formula for the gas flow velocity v is as follows:

[0016] v=πkdh(Tw−2T0+T1)P

[0017] Where k is a constant determined experimentally, d is the diameter of the heating pipe, h is the convective heat transfer coefficient, Tw is the wall temperature of the heating pipe, and P is the convective heat transfer power.

[0018] Secondly, the present invention also provides a system for qualitatively analyzing flow rate by means of the temperature difference before and after a heated pipeline, comprising:

[0019] The first temperature sensor is located at the inlet of the heating pipe;

[0020] The second temperature sensor is located at the outlet of the heating pipe;

[0021] The controller is used to receive feedback values ​​from the first temperature sensor and the second temperature sensor, calculate the temperature difference, determine the flow rate level based on the temperature difference, and adjust the heating power.

[0022] Furthermore, the controller is also used to dynamically adjust the heating power according to the real-time flow level to reduce condensation or improve humidification efficiency.

[0023] Furthermore, the system is integrated into a humidifier or respiratory support device.

[0024] The method and system for qualitatively analyzing flow rate by measuring the temperature difference before and after a heated pipeline provided by this invention have at least the following advantages compared with existing technologies:

[0025] While existing technologies employ methods for monitoring pipeline temperature using temperature sensors, most are limited to temperature control and fail to qualitatively determine flow rate based on temperature differences, nor do they address the issue of unstable humidification performance caused by flow rate variations. This invention, however, features a simple and convenient process. Without increasing hardware costs, it qualitatively obtains flow information (i.e., high, medium, and low flow rates) through feedback values ​​from a temperature sensor, resolving the performance degradation issue caused by the lack of flow information in the humidifier and indirectly improving the compatibility of the humidifier with ventilators. Attached Figure Description

[0026] To more clearly illustrate the solution of the present invention, a brief introduction will be given to the drawings used in the description of the embodiments below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a flowchart illustrating a method for qualitatively analyzing flow rate based on the temperature difference before and after a heated pipeline, as provided in an embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of a system structure for qualitatively analyzing flow rate by measuring the temperature difference before and after a heated pipeline, as provided in an embodiment of the present invention. Detailed Implementation

[0029] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0031] This invention provides a method for qualitatively analyzing flow rate by measuring the temperature difference before and after a heated pipeline. Applied to the process of acquiring flow rate information from respiratory support equipment, the method for implementing over / under-voltage protection includes the following steps:

[0032] S10. Obtain the first temperature value T0 at the inlet of the heating pipeline and the second temperature value T1 at the outlet; S20. Calculate the temperature difference ΔT = T1 - T0; S30. Divide the gas flow rate into multiple qualitative levels according to the relationship between the temperature difference ΔT and the preset threshold; S40. Adjust the heating power according to the qualitative levels.

[0033] The invention has a simple process and is easy to operate. It qualitatively determines the gas flow rate in the pipeline by measuring the temperature difference between two temperature sensors before and after the heating breathing pipeline, thereby solving the defect that the humidifier cannot actively obtain the flow rate.

[0034] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0035] This invention provides a method for qualitatively analyzing flow rate by measuring the temperature difference before and after a heated tubing. This method is applied to the process of obtaining flow rate information from respiratory support equipment. The connection diagram between the heated breathing tubing and the humidifier is shown below. Figure 2 Where T0 is the first temperature value (temperature feedback value at the water tank opening), T1 is the second temperature value (sensor feedback value at the patient end), n is the length of the heating tube, and d is the diameter of the heating tube. Figures 1 to 2 In this embodiment, the method for qualitatively analyzing flow rate through the temperature difference before and after the heating pipeline includes the following steps:

[0036] S10. Obtain the first temperature value T0 at the inlet of the heating pipeline and the second temperature value T1 at the outlet.

[0037] S20. Calculate the temperature difference ΔT = T1 - T0.

[0038] S30. Based on the relationship between the temperature difference ΔT and the preset threshold, the gas flow rate is divided into multiple qualitative levels.

[0039] Specifically, in this embodiment, the qualitative levels include low flow rate, medium flow rate, high flow rate, and ultra-high flow rate.

[0040] In this embodiment, each 20L / min is considered a range: 0-20L / min is low flow rate, 20-40L / min is medium flow rate, 40-60L / min is high flow rate, and above 60L / min is ultra-high flow rate.

[0041] In this embodiment, the preset threshold is obtained through experimental calibration or model calculation.

[0042] S40. Adjust the heating power according to the qualitative setting.

[0043] In the method for qualitatively analyzing flow rate through the temperature difference before and after a heated pipeline provided in this embodiment of the invention, in order to estimate the approximate gas flow rate based on the temperature difference, it is necessary to start from the basic principles of convective heat transfer and energy conservation, and derive an approximate formula based on some simplifications and assumptions. Specifically:

[0044] Assuming the convective heat transfer coefficient h is proportional to the gas velocity v (this is a simplified assumption), that is:

[0045] h=kv

[0046] Where k is a constant, determined through experimental or empirical data.

[0047] Next, consider convective heat transfer within the pipe. Assuming the pipe wall temperature is constant at Tw, the average temperature of the gas within the pipe can be approximated by the average of the temperatures at both ends. Therefore:

[0048] Tm = T0 + T1 / 2

[0049] The power (heat flow) Q of convective heat transfer can be expressed as:

[0050] Q=hA(Tw−Tm)

[0051] Where A is the heat exchange area of ​​the pipe, and for a circular pipe: A = πdn;

[0052] Since the pipe is heated, P=Q, that is:

[0053] P=hA(Tw−2T0+T1)

[0054] Substituting h=kv into the above equation, we get:

[0055] P=kvA(Tw−2T0+T1)

[0056] Solving the above equation for the flow velocity v, we get:

[0057] v=πkdh(Tw−2T1+T2)P

[0058] The above formula is the formula for estimating gas flow rate through the temperature difference before and after. This formula is based on a series of simplifications and assumptions. In practice, to provide accuracy, the relationship between flow rate and temperature difference can be determined through more complex models and experimental data. After obtaining qualitative flow parameters, the humidifier can adjust the heating power according to the real-time flow rate to reduce condensation.

[0059] This invention also provides a system for qualitatively analyzing flow rate by measuring the temperature difference before and after a heated pipeline, integrated into a humidifier or breathing support device. The system includes: a first temperature sensor located at the inlet of the heated pipeline; a second temperature sensor located at the outlet of the heated pipeline; and a controller for receiving feedback values ​​from the first and second temperature sensors, calculating the temperature difference, determining the flow rate level based on the temperature difference, and adjusting the heating power. The controller is also used to dynamically adjust the heating power based on the real-time flow rate level to reduce condensation or improve humidification efficiency.

[0060] The method and system described in the above embodiments for qualitatively analyzing flow rate based on the temperature difference before and after heating the pipeline, compared with the prior art, addresses the issue that while existing technologies use temperature sensors to monitor pipeline temperature, these methods are mostly used only for temperature control and do not achieve qualitative judgment of flow rate based on temperature difference, nor do they solve the problem of unstable humidification performance caused by flow rate changes. This invention features a simple process and convenient operation. Without increasing hardware costs, it qualitatively obtains flow rate information (i.e., high, medium, and low flow rates) through the feedback value of the temperature sensor, solving the performance degradation problem caused by the lack of flow rate information in the humidifier, and indirectly improving the compatibility of the humidifier with the ventilator.

[0061] Obviously, the embodiments described above are merely preferred embodiments of the present invention, and not all embodiments. The accompanying drawings illustrate preferred embodiments of the present invention, but do not limit the scope of the patent. The present invention can be implemented in many different forms; rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention. Although the present invention 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 specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this invention.

Claims

1. A method for qualitatively analyzing flow rate by measuring the temperature difference before and after a heated pipeline, characterized in that, Includes the following steps: S10. Obtain the first temperature value T0 at the inlet of the heating pipeline and the second temperature value T1 at the outlet; S20. Calculate the temperature difference ΔT = T1 - T0; S30. Based on the relationship between the temperature difference ΔT and the preset threshold, the gas flow rate is divided into multiple qualitative levels; S40. Adjust the heating power according to the qualitative setting.

2. The method for qualitatively analyzing flow rate by means of temperature difference before and after a heated pipeline according to claim 1, characterized in that, In S30, the qualitative levels include low flow, medium flow, high flow, and ultra-high flow.

3. The method for qualitatively analyzing flow rate by means of temperature difference before and after a heated pipeline according to claim 2, characterized in that, Each 20L / min interval represents a flow rate range: 0-20L / min is low flow rate, 20-40L / min is medium flow rate, 40-60L / min is high flow rate, and above 60L / min is ultra-high flow rate.

4. The method for qualitatively analyzing flow rate by means of temperature difference before and after a heated pipeline according to claim 1, characterized in that, The preset threshold is obtained through experimental calibration or model calculation.

5. The method for qualitatively analyzing flow rate by means of temperature difference before and after a heated pipeline according to claim 1, characterized in that, The formula for gas flow velocity v is as follows: v=πkdh(Tw−2T0+T1)P Where k is a constant determined experimentally, d is the diameter of the heating pipe, h is the convective heat transfer coefficient, Tw is the wall temperature of the heating pipe, and P is the convective heat transfer power.

6. A system employing the method as described in any one of claims 1 to 5, characterized in that, include: The first temperature sensor is located at the inlet of the heating pipe; The second temperature sensor is located at the outlet of the heating pipe; The controller is used to receive feedback values ​​from the first temperature sensor and the second temperature sensor, calculate the temperature difference, determine the flow rate level based on the temperature difference, and adjust the heating power.

7. The system according to claim 6, characterized in that, The controller is also used to dynamically adjust the heating power according to the real-time flow level in order to reduce condensation or improve humidification efficiency.

8. The system according to claim 6, characterized in that, The system is integrated into a humidifier or respiratory support device.

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