CN105879183A - Method for controlling air and oxygen mixing concentration in respirator - Google Patents
Method for controlling air and oxygen mixing concentration in respirator Download PDFInfo
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- CN105879183A CN105879183A CN201410784893.3A CN201410784893A CN105879183A CN 105879183 A CN105879183 A CN 105879183A CN 201410784893 A CN201410784893 A CN 201410784893A CN 105879183 A CN105879183 A CN 105879183A
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Abstract
The invention provides a method for controlling the air and oxygen mixing concentration in a respirator. An air flow controllable proportional valve and an oxygen flow controllable proportional valve are arranged at the input ends of the respirator respectively, and an air flow sensor and an oxygen flow sensor are arranged at the input ends of the respirator respectively; the total flow d of air and oxygen mixed gas needing to be output by the output end of the respirator and the oxygen content c in the air and oxygen mixed gas are set in advance; according to the values of c and d, the air flow a and oxygen flow b needing to be input by the input ends of the respirator are calculated; the air flow controllable proportional valve and the oxygen flow controllable proportional valve at the input ends of the respirator are adjusted respectively so that the respirator can reach the calculated air flow a and oxygen flow b; in the air supply process, a PID control system is formed by the air flow sensor, the oxygen flow sensor and the flow controllable proportional valves, and the opening degrees of the flow controllable proportional valves are adjusted in a feedback mode and controlled so that the respirator can always keep passing of required air flow and oxygen flow.
Description
Technical field
The present invention relates to one in respirator after air oxygen mix, the control of oxygen concentration in the empty oxygen gas mixture of output
Method, belongs to armarium manufacturing technology field.
Background technology
During respirator controls, need the concentration of oxygen in the empty oxygen gas mixture that patient end is sucked accurately to control, i.e. exhaling
Suction machine input carries out rational proportion to the volume of air and oxygen, need to provide specific oxygen concentration, to reach to exhale according to different patients
Inhale therapeutic effect.Air mass flow and oxygen flow to respirator input are adjusted controlling the most by rule of thumb, it is difficult to reach
To accurately controlling.
Summary of the invention
It is an object of the invention to provide a kind of respirator melting concn control method, when respirator supplies, energy to patient
Accurately control the oxygen concentration in supply.
Technical scheme is as follows:
A kind of respirator melting concn control method, it is characterised in that comprise the following steps:
(1) at the air input of respirator, flow-controllable proportioning valve, and air flow sensor are set；At respirator
Oxygen input, flow-controllable proportioning valve, and oxygen flow sensor are set；
(2) according to sick human needs, total flow d that respirator outfan needs the empty oxygen gas mixture of output is preset, and
Oxygen content c therein；According to the value of c and d, calculating respirator input needs air mass flow a and the oxygen stream of input
Amount b, computational methods are as follows:
Air mass flow a=[(100-c) * d]/79；
Oxygen flow b=[(c-21) * d]/79；
(3) respirator air input and the flow-controllable proportioning valve of oxygen input are adjusted respectively so that it is reach step (3)
Air mass flow a determined and oxygen flow b；
(4) the oxygen flow sensor and the flow-controllable proportioning valve that utilize oxygen input constitute PID control system, pass through oxygen
The oxygen flow that flow transducer records, feedback regulation also controls the opening degree of flow-controllable proportioning valve of oxygen input so that it is
Keep the oxygen flow b needed；The air flow sensor and the flow-controllable proportioning valve that utilize air input constitute PID and control
System, the air mass flow recorded by air flow sensor, feedback regulation also controls the flow-controllable proportioning valve of air input
Opening degree so that it is keep need air mass flow a.
Control method simple and fast that the present invention provides and accurately, as long as pre-setting the gas supply flow of client need and oxygen is dense
Degree, can quickly calculate and need respirator input to need air and the flow of oxygen controlled, regulation input air and oxygen
Gas flow-controllable proportioning valve reaches necessary flow, then controls flow-controllable ratio by the most ripe closed loop pid algorithm
Valve keeps necessary flow, and control accuracy is higher, carries out sky oxygen burden control by this method, and the precision of oxygen concentration can reach 1%.
Detailed description of the invention
Below by way of detailed description of the invention, respirator melting concn control method of the present invention is described in detail.
The present invention is realized by following steps:
(1) before respirator supplies, first at the air input of respirator, flow-controllable proportioning valve, and air are set
Flow transducer；At the oxygen input of respirator, flow-controllable proportioning valve, and oxygen flow sensor are set.
(2) according to the concrete needs of different patients, presetting respirator outfan needs the empty oxygen gas mixture to patient's output
Total flow d, and oxygen content c therein.According to the value of c and d, can calculate respirator input needs input
Air mass flow a and oxygen flow b, computational methods are as follows:
Air mass flow a=[(100-c) * d]/79；
Oxygen flow b=[(c-21) * d]/79；
Above-mentioned computational methods are that the applicant passes through repeatedly to test to draw.Experimentation is as follows:
At the input of respirator, respectively the flow of air and oxygen is controlled with two flow-controllable proportioning valves, and with two
The flow of air and oxygen is measured by flow transducer respectively；At the empty oxygen mixing outfan of respirator, it is dense that oxygen is set
Degree sensor, to measure the empty mixed oxygen concentration of oxygen.Then two flow-controllable proportioning valves of regulation, make air mass flow and oxygen
Flow is the arbitrary value in allowed band, and records the oxygen concentration sensing corresponding to each group of air flow value and oxygen flow value
The measured value of device.
By many experiments, and experimental result is analyzed, applicants have discovered that equation below:
If air mass flow is a, the flow of oxygen is b, then the oxygen concentration in mixed empty oxygen gas mixture is
(a*1+b*0.21)/(a+b)。
If pushing away it follows that the oxygen concentration exported is c according to above-mentioned formula is counter, the flow of the empty oxygen gas mixture of output
For d, then the flow of respirator input oxygen should be [(c-21) * d]/79, the flow of air should be [(100-c) * d]/79.
Below be i.e. the present invention after outfan total gas couette and oxygen concentration determine, input air mass flow and oxygen flow
Basis.
(3), after input air mass flow and oxygen flow being determined by calculating, respirator air input and oxygen are adjusted respectively
The flow-controllable proportioning valve of gas input so that it is reach air mass flow a determined by step and oxygen flow b.
(4), after supply starts, flow-controllable proportioning valve can produce little deviation because many factors during supply.This
Invention, again by having been known at present and the most ripe closed loop pid algorithm, utilizes the oxygen flow sensor of oxygen input and controlled
Flow proportion valve constitutes PID control system, and the oxygen flow recorded by oxygen flow sensor, feedback regulation also controls oxygen
The opening degree of the flow-controllable proportioning valve of input so that it is remain the oxygen flow b by needing；Utilize air input
Air flow sensor and flow-controllable proportioning valve constitute PID control system, the air stream recorded by air flow sensor
Amount, feedback regulation also controls the opening degree of flow-controllable proportioning valve of air input so that it is remain the air by needing
Flow a.
By said method, can accurately control the oxygen concentration in the empty oxygen gas mixture of respirator output.Defeated according to being arranged on
Going out the data that the oxygen concentration sensor of end is measured, this method controls the precision of concentration of oxygen output and can reach 1%.
Claims (1)
1. a respirator melting concn control method, it is characterised in that comprise the following steps:
(1) at the air input of respirator, flow-controllable proportioning valve, and air flow sensor are set；At respirator
Oxygen input, flow-controllable proportioning valve, and oxygen flow sensor are set；
(2) according to sick human needs, total flow d that respirator outfan needs the empty oxygen gas mixture of output is preset, and
Oxygen content c therein；According to the value of c and d, calculating respirator input needs air mass flow a and the oxygen stream of input
Amount b, computational methods are as follows:
Air mass flow a=[(100-c) * d]/79；
Oxygen flow b=[(c-21) * d]/79；
(3) respirator air input and the flow-controllable proportioning valve of oxygen input are adjusted respectively so that it is reach step (3)
Air mass flow a determined and oxygen flow b；
(4) the oxygen flow sensor and the flow-controllable proportioning valve that utilize oxygen input constitute PID control system, pass through oxygen
The oxygen flow that flow transducer records, feedback regulation also controls the opening degree of flow-controllable proportioning valve of oxygen input so that it is
Keep the oxygen flow b needed；The air flow sensor and the flow-controllable proportioning valve that utilize air input constitute PID and control
System, the air mass flow recorded by air flow sensor, feedback regulation also controls the flow-controllable proportioning valve of air input
Opening degree so that it is keep need air mass flow a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410784893.3A CN105879183A (en) | 2014-12-16 | 2014-12-16 | Method for controlling air and oxygen mixing concentration in respirator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410784893.3A CN105879183A (en) | 2014-12-16 | 2014-12-16 | Method for controlling air and oxygen mixing concentration in respirator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105879183A true CN105879183A (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410784893.3A Pending CN105879183A (en) | 2014-12-16 | 2014-12-16 | Method for controlling air and oxygen mixing concentration in respirator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106540382A (en) * | 2016-12-30 | 2017-03-29 | 中国人民解放军第四军医大学 | A kind of electronics breathing regulator and method for being applied to aircrew's oxygen supply on machine |
| CN106980329A (en) * | 2017-03-25 | 2017-07-25 | 中建材（合肥）新能源有限公司 | A kind of glass furnace for pure oxygen combustion oxygen flow automatic control system |
| CN114432916A (en) * | 2021-12-30 | 2022-05-06 | 北京航天长峰股份有限公司 | Gas mixing equipment |
| CN114558221A (en) * | 2022-02-11 | 2022-05-31 | 山东大学 | Air-oxygen mixer for portable respirator and control method thereof |
-
2014
- 2014-12-16 CN CN201410784893.3A patent/CN105879183A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106540382A (en) * | 2016-12-30 | 2017-03-29 | 中国人民解放军第四军医大学 | A kind of electronics breathing regulator and method for being applied to aircrew's oxygen supply on machine |
| CN106980329A (en) * | 2017-03-25 | 2017-07-25 | 中建材（合肥）新能源有限公司 | A kind of glass furnace for pure oxygen combustion oxygen flow automatic control system |
| CN114432916A (en) * | 2021-12-30 | 2022-05-06 | 北京航天长峰股份有限公司 | Gas mixing equipment |
| CN114558221A (en) * | 2022-02-11 | 2022-05-31 | 山东大学 | Air-oxygen mixer for portable respirator and control method thereof |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160824 |