Oxygen concentration calibration device for respirator detector

Abstract

The utility model provides an oxygen concentration calibration device for a respirator detector, which comprises an airflow trunk, a plurality of airflow branches suitable for forming different calibration points, a plurality of electrically operated valves, an oxygen concentration sensor and a control system, the airflow trunk comprises an airflow inlet end suitable for being connected with a fan and an airflow outlet end suitable for being connected with a respirator detector to be calibrated, one end of each airflow branch is connected into the airflow trunk, the other end of each airflow branch is connected with a standard oxygen module, and the standard oxygen module comprises a standard oxygen bottle and a pressure reducing valve suitable for regulating and controlling the output air pressure of the standard oxygen bottle. The standard oxygen bottles are suitable for outputting standard oxygen with different concentrations, the electric valves are connected into the airflow branch circuits and control airflow output of the corresponding airflow branch circuits, and the oxygen concentration sensors are connected into the airflow main circuit, are adjacent to the respirator detector and are suitable for monitoring the oxygen concentration output by the airflow main circuit and displaying the oxygen concentration value. According to the utility model, the fan is arranged to remove residual gas, so that the calibration precision is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of measurement work of medical instruments and equipment, and particularly relates to an oxygen concentration calibration device for a breathing machine detector. Background Art

[0002] The ventilator has become the most commonly used emergency and life support equipment in clinical practice. Through the clinical application of ventilators, the mortality rate of respiratory failure has gradually decreased. However, oxygen inhalation exceeding a certain concentration and time will have a harmful effect on the body and cause oxygen poisoning. While not alleviating the patient's condition, it will also increase additional risks. Whether the oxygen concentration parameters of the ventilator are accurate also has a significant impact on the clinical treatment effect and even the patient's life safety. The accuracy of the oxygen concentration of the ventilator detector will directly affect the normal use of the ventilator, so the calibration of the oxygen concentration of the ventilator detector is of great significance.

[0003] At present, the calibration specifications of ventilator detectors in my country have not been made public. Each metrological institution uses a self-compiled calibration method to calibrate the ventilator detector according to the ventilator calibration specifications. The existing oxygen concentration calibration methods mainly include the following two points: (1) calibrating the oxygen concentration parameters of the ventilator detector by real-time mixing of oxygen and nitrogen; (2) directly calibrating the ventilator detector through a standard oxygen cylinder. The above method (1) has the problem of slow calibration time. It is necessary to continuously adjust the amount of the two gases to stabilize at the calibration point, and the calibration efficiency is not high enough. The above method (2) has the problem of insufficient oxygen concentration accuracy. When a mixed gas with an oxygen concentration of 21% is released through the pipeline, and then a mixed gas with an oxygen concentration of 40% is switched to pass through the pipeline, the mixed gas with an oxygen concentration of 21% will remain in the pipeline, which will make the oxygen concentration in the mixed gas in the pipeline less than 40%, and there is a problem of insufficient accuracy. The utility model provides a method that is both efficient and accurate to calibrate the oxygen concentration of a ventilator detector, which solves the above two problems very well and has certain significance for the oxygen concentration calibration of ventilator detectors in reality. Utility Model Content

[0004] In view of the above-mentioned defects of the prior art, the purpose of the utility model is to provide a ventilator detector oxygen concentration calibration device to meet the needs of users.

[0005] To achieve the above object, the utility model provides a breathing machine detector oxygen concentration calibration device, comprising

[0006] The air flow trunk includes an air flow inlet end suitable for connecting to a fan and an air flow outlet end suitable for connecting to a ventilator detector to be calibrated.

[0007] A plurality of air flow branches, which are suitable for forming different calibration points, one end of each of the air flow branches is connected to the air flow trunk, and the other end is connected to a standard oxygen module, the standard oxygen module includes a standard oxygen cylinder and a pressure reducing valve suitable for regulating the output air pressure of the standard oxygen cylinder, each of the standard oxygen cylinders is suitable for outputting standard oxygen of different concentrations,

[0008] A plurality of electric valves are connected to and control the airflow output of the corresponding airflow branches,

[0009] an oxygen concentration sensor connected to the air flow trunk and adjacent to the ventilator detector, adapted to monitor the oxygen concentration of the standard oxygen output by the air flow trunk and display the oxygen concentration value,

[0010] The control system is suitable for electrically connecting and controlling the opening and closing of the blower, the electric valve and the oxygen concentration sensor, and is also suitable for receiving, storing and converting calibration data.

[0011] Preferably, the standard oxygen cylinders store standard oxygen of 21% VOL, 40% VOL, 60% VOL, 80% VOL and 99% VOL respectively.

[0012] Preferably, the pressure reducing valve is installed at the bottle mouth of the standard oxygen cylinder.

[0013] As a preferred embodiment, the pressure reducing valve is connected to the electric valve through a branch hose, and the electric valve is connected to the air flow trunk through a branch pipeline.

[0014] Preferably, the air flow trunk comprises a trunk pipe with a nominal diameter of 25 mm.

[0015] Preferably, the control system includes a PLC module, which is suitable for controlling the start and stop of the electric valve, the fan, and the oxygen concentration sensor, and is suitable for receiving, storing and converting data output by the oxygen concentration sensor.

[0016] As a preferred embodiment, the electric valve and the fan are connected to the PLC module through an I / O port, and the oxygen concentration sensor is connected to a current signal interface of the PLC module.

[0017] Preferably, the control system includes upper computer software, which includes human-computer interaction software suitable for receiving 4-20mA current analog data and a calculation module suitable for converting and displaying the oxygen concentration value monitored by the oxygen concentration sensor and calculating the error, thereby completing calibration and forming a calibration report.

[0018] The operating steps of the ventilator detector oxygen concentration calibration device are as follows:

[0019] S1. Connect the fan, the ventilator detector, and the oxygen concentration sensor to the air flow trunk, connect the electric valve and the standard oxygen module to the air flow trunk, and then connect the air flow branch to the air flow trunk, and check whether there is air leakage at each connection;

[0020] S2. Adjust the output pressure value of each pressure reducing valve and open each standard oxygen cylinder;

[0021] S3, connecting one of the airflow branches with the airflow trunk through a corresponding electric valve, the oxygen concentration indication of the oxygen concentration sensor is stable and the difference between the oxygen concentration indication and the oxygen concentration of the standard oxygen in the airflow branch is within ±0.5% VOL, and recording the indication of the oxygen concentration sensor and the oxygen concentration indication on the ventilator detector;

[0022] S4, close the electric valve in S3, turn on the fan to blow air into the air trunk for 10 seconds. This step is suitable for cleaning the gas remaining in the air trunk when measuring the last calibration point;

[0023] S5, repeat the actions of S3 and S4, connect the other airflow branches with the airflow trunk, complete the measurement of other calibration points and record the data;

[0024] S6, after the calibration is completed, the standard oxygen cylinder, the electric valve, the blower, the oxygen concentration sensor and the ventilator detector are turned off, and the ventilator detector is disassembled and separated from the air trunk line;

[0025] S7. Process the recorded data to form a calibration report of the oxygen concentration of the ventilator detector.

[0026] As a preference: the calibration environment needs to meet the following conditions:

[0027] The air flow trunk can be arranged horizontally;

[0028] The ambient temperature is between 10 and 30°C, and the ambient temperature difference before and after calibration does not exceed ±1°C;

[0029] The output pressure of each standard oxygen cylinder shall not exceed 0.01MPa.

[0030] The beneficial effects of the utility model are:

[0031] (1) By setting a fan to blow air into the air flow trunk between the measurements of two calibration points to remove residual gas, the influence of the residual gas when measuring the previous calibration point on the measurement of the next calibration point can be reduced, thereby improving the calibration accuracy while ensuring the calibration efficiency.

[0032] (2) Due to the influence of temperature, pressure and impurities, the oxygen concentration of standard oxygen will be slightly reduced after passing through the branch hose and the main pipeline. By setting an oxygen concentration sensor, the actual oxygen concentration of the standard oxygen entering the ventilator detector can be corrected, reducing environmental impact, making the measurement more scientific, and improving calibration accuracy.

[0033] (3) A pressure reducing valve is provided to avoid the risk of oxygen poisoning of workers caused by excessive standard oxygen pressure, thereby improving safety during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The utility model provides a structural schematic diagram of an oxygen concentration calibration device for a breathing machine detector.

[0035] Figure 2 The utility model provides a control system schematic diagram.

[0036] In the figure:

[0037] 1. Fan; 2. Electric valve; 3. Standard oxygen cylinder; 4. Pressure reducing valve; 5. Oxygen concentration sensor; 6. Respirator detector; 7. Main pipeline; 8. Branch hose; 9. Air flow inlet; 10. Air flow outlet; 11. Branch pipeline. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme of the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0040] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0041] like Figure 1 , Figure 2The invention discloses a device for calibrating oxygen concentration of a ventilator detector, comprising an air flow trunk, five air flow branches suitable for forming different calibration points, five electric valves 2, an oxygen concentration sensor 5 and a control system. The air flow trunk comprises a trunk pipeline 7 with a nominal diameter of 25 mm. The two axial ends of the trunk pipeline 7 are formed with an air flow inlet end 9 suitable for connecting to a blower 1 and an air flow outlet end 10 suitable for connecting to a ventilator detector 6 to be calibrated. One end of each air flow branch is connected to the trunk pipeline 7, and the other end is connected to a standard oxygen module. The standard oxygen module comprises a standard oxygen cylinder 3 and a pressure reducing valve 4 installed at the bottle mouth of the standard oxygen cylinder 3. Each standard oxygen cylinder 3 stores standard oxygen of 21%VOL, 40%VOL, 60%VOL, 80%VOL and 99%VOL respectively. The pressure reducing valve 4 is suitable for regulating the output air pressure of the standard oxygen cylinder 3. The pressure reducing valve 4 is connected to the electric valve 2 through the branch hose 8, and the electric valve 2 is connected to the main pipeline 7 through the branch pipeline 11. Each electric valve 2 is suitable for controlling the airflow output of the corresponding airflow branch. The oxygen concentration sensor 5 is connected to the airflow main and adjacent to the ventilator detector 6, which is suitable for monitoring the oxygen concentration output by the airflow main and displaying the oxygen concentration value. The control system is suitable for electrically connecting and controlling the opening and closing of the fan 1, the electric valve 2 and the oxygen concentration sensor 5, and is also suitable for receiving, storing and converting calibration data.

[0042] In this embodiment, the control system includes a PLC module and a host computer software. The electric valve 2 and the fan 1 are connected to the PLC module through the I / O port, and the oxygen concentration sensor 5 is connected to the current signal interface of the PLC module. The PLC module is suitable for controlling the start and stop of the electric valve 2, the fan 1, and the oxygen concentration sensor 5, and is suitable for receiving, storing and converting the data output by the oxygen concentration sensor 5. The host computer software includes a human-computer interaction software suitable for receiving 4-20mA current analog data and a calculation module suitable for converting and displaying the oxygen concentration value monitored by the oxygen concentration sensor 5 and calculating the error between it and the oxygen concentration value displayed by the ventilator detector 6 to be calibrated, thereby completing the calibration and forming a calibration report.

[0043] Before calibration, the trunk pipeline 7 is set horizontally, and the ambient temperature is kept between 10 and 30° C., and the difference in ambient temperature before and after calibration does not exceed ±1° C.

[0044] like Figure 2 The operating steps of the ventilator detector oxygen concentration calibration device are as follows:

[0045] S1. Connect the fan 1, the ventilator detector 6, and the oxygen concentration sensor 5 to the air flow trunk, connect the electric valve 2 and the standard oxygen module to the air flow trunk, and then connect the air flow branch to the air flow trunk, and check whether there is any leakage at each connection;

[0046] S2. Adjust the output pressure value of each pressure reducing valve 4 so that the output pressure of each standard oxygen cylinder 3 does not exceed 0.01 MPa, and open each standard oxygen cylinder 3;

[0047] S3. The airflow branch with 21% VOL standard oxygen is connected to the airflow trunk through the corresponding electric valve 2. The oxygen concentration indicated by the oxygen concentration sensor 5 is stable and is 21% VOL (±0.5% VOL). The indicated value of the oxygen concentration sensor 5 and the oxygen concentration indicated on the ventilator detector 6 are recorded.

[0048] S4, close the electric valve 2 in S3, turn on the fan 1 to blow air into the air trunk for 10 seconds. This step is suitable for cleaning the gas remaining in the air trunk when measuring the last calibration point;

[0049] S5, repeat the actions of S3 and S4, connect the other airflow branches with the airflow trunk in sequence, complete the calibration of the four calibration points of 40% VOL, 60% VOL, 80% VOL, and 99% VOL, and record the data;

[0050] S6, after the calibration is completed, the standard oxygen cylinder 3, the electric valve 2, the blower 1, the oxygen concentration sensor 5 and the ventilator detector 6 are turned off, and the ventilator detector 6 is disassembled and separated from the air trunk line;

[0051] S7. Process the recorded data to generate a calibration report of the oxygen concentration of the ventilator detector 6.

[0052] The above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model.

Claims

1. A breathing machine detector oxygen concentration calibration device, characterized in that: include The air flow trunk includes an air flow inlet end suitable for connecting to a fan and an air flow outlet end suitable for connecting to a ventilator detector to be calibrated. A plurality of air flow branches, which are suitable for forming different calibration points, one end of each of the air flow branches is connected to the air flow trunk, and the other end is connected to a standard oxygen module, the standard oxygen module includes a standard oxygen cylinder and a pressure reducing valve suitable for regulating the output air pressure of the standard oxygen cylinder, each of the standard oxygen cylinders is suitable for outputting standard oxygen of different concentrations, A plurality of electric valves are connected to and control the airflow output of the corresponding airflow branches, an oxygen concentration sensor, which is connected to the air flow trunk and adjacent to the ventilator detector, and is suitable for monitoring the oxygen concentration of the standard oxygen output by the air flow trunk and displaying the oxygen concentration value; The control system is suitable for electrically connecting and controlling the opening and closing of the blower, the electric valve and the oxygen concentration sensor, and is also suitable for receiving, storing and converting calibration data.

2. A breathing machine detector oxygen concentration calibration device according to claim 1, characterized in that: The standard oxygen cylinders store standard oxygen of 21% VOL, 40% VOL, 60% VOL, 80% VOL and 99% VOL respectively.

3. A breathing machine detector oxygen concentration calibration device according to claim 1, characterized in that: The pressure reducing valve is installed on the bottle mouth of the standard oxygen cylinder.

4. A breathing machine detector oxygen concentration calibration device according to claim 3, characterized in that: The pressure reducing valve is connected to the electric valve through a branch hose, and the electric valve is connected to the air flow trunk through a branch pipeline.

5. A breathing machine detector oxygen concentration calibration device according to claim 4, characterized in that: The air flow trunk includes a trunk pipeline with a nominal diameter of 25 mm.

6. A breathing machine detector oxygen concentration calibration device according to claim 1, characterized in that: The control system includes a PLC module, which is suitable for controlling the start and stop of the electric valve, the fan, and the oxygen concentration sensor, and is suitable for receiving, storing and converting data output by the oxygen concentration sensor.

7. A breathing machine detector oxygen concentration calibration device according to claim 6, characterized in that: The electric valve and the fan are connected to the PLC module through an I / O port, and the oxygen concentration sensor is connected to a current signal interface of the PLC module.

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