CN108211075A - The method for stabilizing voltage of lung ventilator wind turbine - Google Patents
The method for stabilizing voltage of lung ventilator wind turbine Download PDFInfo
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- CN108211075A CN108211075A CN201711350792.5A CN201711350792A CN108211075A CN 108211075 A CN108211075 A CN 108211075A CN 201711350792 A CN201711350792 A CN 201711350792A CN 108211075 A CN108211075 A CN 108211075A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/08—Bellows; Connecting tubes ; Water traps; Patient circuits
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3331—Pressure; Flow
- A61M2205/3334—Measuring or controlling the flow rate
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3331—Pressure; Flow
- A61M2205/3341—Pressure; Flow stabilising pressure or flow to avoid excessive variation
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- Engineering & Computer Science (AREA)
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- Heart & Thoracic Surgery (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
- Ventilation (AREA)
Abstract
The present invention provides a kind of method for stabilizing voltage of lung ventilator wind turbine, which obtains the final lung ventilator wind turbine rotating speed of target R to be adjusted by establishing and optimizing the rotating speeds line cluster such as wind turbine then in conjunction with control algolithmd, finally, by speed and current formula, rotating speed is converted into electric current, realizes and voltage stabilizing control is carried out to wind turbine.Output pressure can be restored in the error pressure limit that the desired value for needing to export allows by wind turbine method for stabilizing voltage provided by the invention in a short time；It is that a kind of energy fast accurate adjusts lung ventilator wind turbine output pressure to the lung ventilator wind turbine method for stabilizing voltage in the range of goal pressure allowable error, both avoids, using pressure oscillation caused by PID control method, also overcoming the not accuracy of opened loop control.
Description
Technical field
Method for stabilizing voltage more particularly to a kind of method for stabilizing voltage of lung ventilator wind turbine the present invention relates to a kind of wind turbine.
Background technology
In current clinical medicine, effective means of the lung ventilator as an energy artificial substituting expiratory positive airway pressure function is general
All over for the respiratory failure caused by a variety of causes, the anesthesia respiration management during major operation, Breathing Suppotion treatment and emergency resuscitation
In, highly important position is occupied in Modern Medical Field.Lung ventilator is that one kind can play prevention and treatment respiratory failure,
Complication is reduced, saves and extend the vital Medical Devices of patients ' lives.
Lung ventilator is a kind of for the purpose of the air for exporting certain pressure or flow velocity, assisted respiartion insufficiency or because of spy
Different situation can not autonomous respiration patient respiratory medical instrument.Turbofan using motor as power is that lung ventilator is main mian part
Part, the control system of lung ventilator wind turbine is one of the most key system of entire respirator system.
After the pressure sensor in Ventilator Control System and flow sensor collect initial data, FIR will be used
Wave filter is filtered, the smooth pressure and flow curve of the ambient noise that is eliminated.In the voltage stabilizing stage of motor, after filtering
Pressure curve influence show an almost straight curve, but due to patient airway, leakage hole, humidifying water box, pipeline
Etc. structures and user presence so that there are certain interference in whole system, pressure may be impacted at any time so that defeated
The pressure value gone out is changed around target value.
The wind turbine of existing lung ventilator is to realize voltage stabilizing by PID adjustings or opened loop control, the side that the former PID is adjusted
Formula, by ceaselessly reading current pressure values, then compare the gap between actual pressure value and target pressure value accelerating or
Deceleration wind turbine achievees the purpose that pressure value fluctuates in desired value error range；The mode of the latter's opened loop control, passes through empirical value
A Controlling model is established, i.e., goal pressure and motor speed is established a relationship being generally corresponding to, reached in motor speed
After in the range of empirical value setting, stop the control to wind turbine.
Above two voltage stabilizing control method, when carrying out voltage stabilizing, the concussion for the easy initiation pressure of mode that PID is adjusted, and
The mode of opened loop control is unable to reach since goal pressure and motor speed only are established a relationship being generally corresponding to
Accurate control, it will usually which allowing between actual pressure and the pressure value to be aspired for stability has apparent gap；Therefore using above two
Voltage stabilizing control method all largely can influence the performance of lung ventilator or even be also possible to cause centainly Use of respirator person in Shangdi
Security risk.
Documents 1：CN105944197A discloses a kind of open-loop control method and system of lung ventilator wind turbine.The open loop
Control method includes step：Under the operating mode of lung ventilator, the goal pressure P of lung ventilator pre-output air-flow is set；Pass through stream
Quantity sensor acquires the real-time flow data F of lung ventilator institute output gas flow；According to the goal pressure P, real-time flow data F and
Air-blower control amount calibrates table, is calculated according to pre-defined rule in the real-time flow data F, required for exporting the goal pressure P
Air-blower control amount DFP, wherein, m preset flow value is stored in the air-blower control amount calibration table respectively in n default wind
M*n corresponding output pressure value under machine controlled quentity controlled variable, wherein m, n is positive integer；It is controlled according to the air-blower control amount DFP
The lung ventilator wind turbine.The documents provide a kind of open-loop control method of lung ventilator wind turbine, and can reduce pressure oscillation
May, but it is not avoided that opened loop control existing not accuracy in itself still.
Invention content
The technical problem to be solved in the present invention is to provide a kind of method for stabilizing voltage of lung ventilator wind turbine, which can prevent
The concussion of initiation pressure, while can realize quick, the accurate adjusting to pressure, the output pressure of lung ventilator wind turbine is controlled in mesh
It marks in the error range that pressure allows, improves the performance of lung ventilator.
In order to solve the above-mentioned technical problem, the present invention uses following technical scheme：
A kind of method for stabilizing voltage of lung ventilator wind turbine is provided, is specifically comprised the following steps：
The rotating speeds line clusters such as S1, foundation and optimization wind turbine
S11, setting wind turbine starting point rotating speed R0, measure fixed rotation speed of fan R0During lower difference output pressure P, corresponding flow
F establishes one using flow F as abscissa, and output pressure P is the rotating speeds lines such as the wind turbine of ordinate；
S12, with starting point rotating speed R0Increase or reduce and rotation speed of fan is adjusted, obtain different rotation speed of fan R, according to
According to the method in S11, the rotating speeds line f such as a plurality of wind turbine under different rotating speeds R are establishedRThe rotating speeds such as (F, P), obtained a plurality of wind turbine line
It forms the rotating speeds line clusters such as the rotating speeds line clusters such as motor, the motor and covers the attainable all rotating speeds of the wind turbine and all pressure, stream
The combination of amount；
S13, using elliptical analytical function to the rotating speeds line such as every motor fR(F, P) is fitted description, ellipse parsing
Function is：
Obtain the rotating speeds line such as every motor fR(F, P) equation below (1)：
Wherein：A represents corresponding pressure during F=0；B represents corresponding flow during P=0；P≧0；F≧0；
S2, setting：Pressure sensor, flow sensor sampling period for T, sampling period number is n, the target of output
Pressure is TP；
Ventilator Control System monitoring real-time pressure PsIf in n sampling period T, PsBeyond the error pressure allowed
Range starts voltage stabilizing program, and voltage stabilizing adjustment is carried out to wind turbine；
S3, at this point, pressure sensor, flow sensor obtain corresponding pressure value, flow in n sampling period T respectively
Value, while average pressure value P is obtained to n pressure value, flow value averaged respectively1, average flow rate value F1, according to step
Formula (1) in S13 acquires R1, then acquire rotating speed R1The rotating speeds line such as corresponding wind turbine fR1On (F, P), with crossing (F1, P1) point
The perpendicular straight line L of tangent line, by comparing goal pressure TP and P1Size determine the adjusting direction of rotation speed of fan：
If TP>P1, wind turbine acceleration；
If TP<P1, wind turbine deceleration；
After S4, system determine the adjusting direction of rotation speed of fan, with (F1, P1) point is starting point, along the adjusting side of rotation speed of fan
To calculating the rotating speeds line f such as straight line L and each wind turbine one by oneRThe intersection point of (F, P)；
When wind turbine accelerates to adjust, with (F1, P1) point for starting point, along wind turbine acceleration direction until find an intersection point (Fq,
Pq pressure value P q) is more than goal pressure TP, jumps out；
When wind turbine, which slows down, to be adjusted, with (F1, P1) point is starting point, along wind turbine deceleration direction until finding an intersection point (Fq,
Pq) pressure value be less than goal pressure TP, jump out；
S5, system choose intersection point (Fq, Pq) the previous intersection point (F along Fan Regulation directionp, Pp) it is corresponding wait rotating speeds
Line RpWith intersection point (Fq, Pq) where wait rotating speeds line RqThe reference of adjusting target as wind turbine；
S6, then, calculates the ratio D of the distance of two intersection points of TP distances, the calculation formula (2) of ratio D is as follows:
Obtain the final wind turbine rotating speed of target R to be adjustedd, RdCalculate such as formula (3):
Rd=D | Rp-Rq|
It is S7, last, pass through rotating speed-current formula fI(R), rotating speed R is converted into electric current I, voltage stabilizing control is carried out to wind turbine.
Further,
Rotating speed-current formula such as formula (4) in step S7：
Further,
In step S3, the straight line L was point (F1, P1) and be parallel to the straight line P=P of F axis1；
Further,
In step S3, the straight line L was point (F1, P1) and be parallel to the straight line F=F of P axis1。
Further,
In step S3, the straight line L is the L-curve of non-rectilinear construction, and L-curve is parabola：
P=cF2, wherein c ensures that the parabola crosses point (F1, P1), i.e.,:
I.e.：
Further,
The amplitudes such as carrying out in step S12 to rotating speed R increases or adjusts with reducing, and adjustment amplitude is 10~50r/min.
The adjustment of the amplitudes such as non-can also be more carried out according to actual conditions.
Preferably,
In step S3, to the method for n pressure value, flow value averaged for ask arithmetic mean, geometric average or
Weighted average.
Preferably,
Sampling period T is 100~1000HZ.
Preferably,
Sampling period number n=5~20.
Beneficial effects of the present invention：
Within the stationary phase of lung ventilator blower pressure, due to pressure oscillation or patient's turn etc., it can all cause to press
The vibrations of power (about 1cmH2O or so) by a small margin at this point, in order to ensure therapeutic effect, keep the stability of output pressure as possible.
Wind turbine method for stabilizing voltage provided by the invention can in a short time (usually a few tens of milliseconds, even several milliseconds), by output pressure
In the error pressure limit that the desired value TP that being restored to needs to export allows.
Therefore, the present invention is that a kind of energy fast accurate adjusts lung ventilator wind turbine output pressure to goal pressure allowable error
In the range of lung ventilator wind turbine method for stabilizing voltage.Both it avoids, using pressure oscillation caused by PID control method, also overcoming open loop control
The not accuracy of system.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the rotating speeds line schematic diagram such as wind turbine that 1 rotating speed of the embodiment of the present invention is 1000r/min；
Fig. 2 is the rotating speeds line cluster schematic diagrames such as the wind turbine of 1 lung ventilator wind turbine method for stabilizing voltage of the embodiment of the present invention；
Fig. 3 is the drafting schematic diagram of the straight line L of 1 lung ventilator wind turbine method for stabilizing voltage of the embodiment of the present invention.
Specific embodiment
Invention is further illustrated with reference to embodiment and attached drawing, but is not limited to the scope of the present invention.
As shown in Figs. 1-3, the present invention provides a kind of method for stabilizing voltage of lung ventilator wind turbine, specifically comprises the following steps：
The rotating speeds line clusters such as S1, foundation and optimization wind turbine
S11, setting wind turbine starting point rotating speed R0, R in the present embodiment0=1000r/min；Measure fixed rotation speed of fan 1000r/
Under min during difference output pressure P, corresponding flow F, such as：In output pressure during 1cmH2O, corresponding 50LPM flows, and
When exporting 4cmH2O, corresponding 5LPM flows；One is established using flow F as abscissa, output pressure P is that wind turbine of ordinate etc. turns
Fast line, on any position of this curve, the rotating speed of wind turbine is all identical (Fig. 1 signal)；
It is increased or decreased in S12, the present embodiment with starting point rotating speed 1000r/min and rotation speed of fan is adjusted, obtained not
Same rotation speed of fan R, obtains different rotation speed of fan R, then according to the method in S11, establishes a plurality of wind under different rotating speeds R
The rotating speeds line such as machine fRThe rotating speeds such as (F, P), obtained a plurality of wind turbine line is formed the rotating speeds line clusters such as motor and (is obtained due to actual needs
Wait rotating speeds line more than Fig. 2, more dense, Fig. 2 is only as signal), it is attainable that the rotating speeds line cluster such as described motor covers the wind turbine
All rotating speeds and all pressure, the combination of flow；
It can increase or reduce with amplitudes such as 10~50r/min according to actual needs in this step and rotation speed of fan is carried out
Adjustment, adjustment amplitude is smaller, and obtained curve is closeer, more accurate more closing to reality；It can also carry out according to actual needs non-etc.
The adjustment of amplitude.
S13, using elliptical analytical function to the rotating speeds line such as above-mentioned every motor fR(F, P) is fitted description, oval
Analytical function is：
Obtain the rotating speeds line such as every motor fR(F, P) equation below (1)：
Wherein：A represents corresponding pressure during F=0；B represents corresponding flow during P=0；P≧0；F≧0；
S2, the sampling period for setting pressure sensor in the present embodiment, flow sensor as T=1000HZ (1ms), sample
Number of cycles is n=10, and the goal pressure of output is TP；
Ventilator Control System monitoring real-time pressure PsIf within 10 sampling periods, PsBeyond the error pressure allowed
(the allowable error pressure limit of the present embodiment is 0.5cmH to range2O), start voltage stabilizing program, voltage stabilizing adjustment is carried out to wind turbine；
As other preferred embodiments, according to actual needs, the sampling period may be set in 100~1000HZ (1~
10ms)；Number of samples n may be set in 5~20.
S3, at this point, pressure sensor, flow sensor obtain corresponding pressure value, flow in 10 sampling periods respectively
Value, while average pressure value P is obtained to this 10 pressure values, flow value averaged respectively1, average flow rate value F1, asking
When being averaged, arithmetic average, geometrical mean or weighted average can be asked for, is preferably used in the present embodiment
Geometrical mean is asked for 10 pressure values, flow values.
Formula (1) in step S13 acquires R1, then acquire rotating speed R1The rotating speeds line such as corresponding wind turbine fR1(F,P)
On, with crossing (F1, P1) point the perpendicular straight line L of tangent line, by comparing goal pressure TP and P1Size determine rotation speed of fan
Adjust direction：
If TP>P1, wind turbine acceleration；(TP is located at straight line L toward on the extension line of F axis positive directions)
If TP<P1, wind turbine deceleration；(TP is located at straight line L toward on the extension line of F axis negative directions)
After S4, system determine the adjusting direction of rotation speed of fan, with (F1, P1) point is starting point, along the adjusting side of rotation speed of fan
To calculating the rotating speeds line f such as straight line L and each wind turbine one by oneRThe intersection point of (F, P)；
When wind turbine accelerates to adjust, with (F1, P1) point for starting point, along wind turbine acceleration direction until find an intersection point (Fq,
Pq pressure value P q) is more than goal pressure TP, jumps out；
When wind turbine, which slows down, to be adjusted, with (F1, P1) point is starting point, along wind turbine deceleration direction until finding an intersection point (Fq,
Pq) pressure value be less than goal pressure TP, jump out；
S5, system choose intersection point (Fq, Pq) the previous intersection point (F along Fan Regulation directionp, Pp) it is corresponding wait rotating speeds
Line RpWith intersection point (Fq, Pq) where wait rotating speeds line RqThe reference of adjusting target as wind turbine；
S6, then, calculates the ratio D of the distance of two intersection points of TP distances, the calculation formula (2) of ratio D is as follows:
Obtain the final wind turbine rotating speed of target R to be adjustedd, RdCalculate such as formula (3):
Rd=D | Rp-Rq|
It is S7, last, pass through rotating speed-current formula fI(R), rotating speed-current formula such as formula (4)：
Rotating speed R is converted into electric current I, voltage stabilizing control is carried out to wind turbine.
As other preferred embodiments,
In step S3, the straight line L can be replaced point (F1, P1) and be parallel to the straight line P=P of F axis1。
Or it replaces with：Cross point (F1, P1) and be parallel to the straight line F=F of P axis1。
It may be replaced by：Cross point (F1, P1) parabola：
Certainly can also be construction crosses point (F1, P1) other non-rectilinears.
Within the stationary phase of the present embodiment lung ventilator blower pressure, due to pressure oscillation or patient's turn etc., all
The vibrations of (about 1cmH2O or so) by a small margin can be caused stress, at this point, in order to ensure therapeutic effect, keep output pressure as possible
Stability.Wind turbine method for stabilizing voltage provided by the invention can in a short time (usually a few tens of milliseconds, even several milliseconds), will be defeated
Go out in the error pressure limit that pressure recovery allows to the desired value TP for needing to export.
Therefore, the present invention is that a kind of energy fast accurate adjusts lung ventilator wind turbine output pressure to goal pressure allowable error
In the range of lung ventilator wind turbine method for stabilizing voltage.Both it avoids, using pressure oscillation caused by PID control method, also overcoming open loop control
The not accuracy of system.
Basic principle, main feature and the advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, various changes and improvements may be made to the invention without departing from the spirit and scope of the present invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent defines.
Claims (9)
1. the method for stabilizing voltage of lung ventilator wind turbine, which is characterized in that specifically comprise the following steps：
The rotating speeds line clusters such as S1, foundation and optimization wind turbine
S11, setting wind turbine starting point rotating speed R0, measure fixed rotation speed of fan R0During lower difference output pressure P, corresponding flow F is built
One is stood using flow F as abscissa, output pressure P is the rotating speeds lines such as wind turbine of ordinate；
S12, with starting point rotating speed R0Increase or reduce and rotation speed of fan is adjusted, different rotation speed of fan R is obtained, according to S11
In method, establish the rotating speeds line f such as a plurality of wind turbine under different rotating speeds RRThe rotating speeds such as (F, P), obtained a plurality of wind turbine line is formed
The rotating speeds line clusters such as the rotating speeds line cluster such as motor, the motor cover the attainable all rotating speeds of the wind turbine and all pressure, flow
Combination；
S13, using elliptical analytical function to the rotating speeds line such as every motor fR(F, P) is fitted description, oval analytical function
For：
Obtain the rotating speeds line such as every motor fR(F, P) equation below (1)：
Wherein：A represents corresponding pressure during F=0；B represents corresponding flow during P=0；P≧0；F≧0；
S2, setting：Pressure sensor, flow sensor sampling period for T, sampling period number is n, the goal pressure of output
For TP；
Ventilator Control System monitoring real-time pressure PsIf in n sampling period T, PsBeyond the error pressure model allowed
It encloses, starts voltage stabilizing program, voltage stabilizing adjustment is carried out to wind turbine；
S3, at this point, pressure sensor, flow sensor obtain corresponding pressure value, flow value in n sampling period T respectively, together
When respectively to n pressure value, flow value averaged, obtain average pressure value P1, average flow rate value F1, according in step S13
Formula (1) acquire R1, then acquire rotating speed R1The rotating speeds line such as corresponding wind turbine fR1On (F, P), with crossing (F1, P1) point tangent line
Perpendicular straight line L, by comparing goal pressure TP and P1Size determine the adjusting direction of rotation speed of fan：
If TP>P1, wind turbine acceleration；
If TP<P1, wind turbine deceleration；
After S4, system determine the adjusting direction of rotation speed of fan, with (F1, P1) point is starting point, along the adjusting direction of rotation speed of fan, by
The rotating speeds line f such as a calculating straight line L and each wind turbineRThe intersection point of (F, P)；
When wind turbine accelerates to adjust, with (F1, P1) point is starting point, along wind turbine acceleration direction until finding an intersection point (Fq, Pq)
Pressure value P q is more than goal pressure TP, jumps out；
When wind turbine, which slows down, to be adjusted, with (F1, P1) point is starting point, along wind turbine deceleration direction until finding an intersection point (Fq, Pq)
Pressure value is less than goal pressure TP, jumps out；
S5, system choose intersection point (Fq, Pq) the previous intersection point (F along Fan Regulation directionp, Pp) corresponding wait rotating speeds line RpWith
Intersection point (Fq, Pq) where wait rotating speeds line RqThe reference of adjusting target as wind turbine；
S6, then, calculates the ratio D of the distance of two intersection points of TP distances, the calculation formula (2) of ratio D is as follows:
Obtain the final wind turbine rotating speed of target R to be adjustedd, RdCalculate such as formula (3):
Rd=D | Rp-Rq|
It is S7, last, pass through rotating speed-current formula fI(R), rotating speed R is converted into electric current I, voltage stabilizing control is carried out to wind turbine.
2. the method for stabilizing voltage of lung ventilator wind turbine according to claim 1, which is characterized in that
Rotating speed-current formula such as formula (4) in step S7：
3. the method for stabilizing voltage of lung ventilator wind turbine according to claim 1 or 2, which is characterized in that
In step S3, the straight line L was point (F1, P1) and be parallel to the straight line P=P of F axis1。
4. the method for stabilizing voltage of lung ventilator wind turbine according to claim 1 or 2, which is characterized in that
In step S3, the straight line L was point (F1, P1) and be parallel to the straight line F=F of P axis1。
5. the method for stabilizing voltage of lung ventilator wind turbine according to claim 1 or 2, which is characterized in that
In step S3, the straight line L is the L-curve of non-rectilinear construction, and L-curve is parabola：
6. the method for stabilizing voltage of lung ventilator wind turbine according to claim 1 or 2, which is characterized in that
The amplitudes such as carrying out in step S12 to rotating speed R increases or adjusts with reducing, and adjustment amplitude is 10~50r/min.
7. the method for stabilizing voltage of lung ventilator wind turbine according to claim 1 or 2, which is characterized in that
In step S3, the method to n pressure value, flow value averaged is to ask arithmetic mean, geometric average or weighting
It is average.
8. the method for stabilizing voltage of lung ventilator wind turbine according to claim 1 or 2, which is characterized in that
Sampling period T is 100~1000HZ.
9. the method for stabilizing voltage of lung ventilator wind turbine according to claim 1 or 2, which is characterized in that
Sampling period number n=5~20.
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| CN201711350792.5A CN108211075B (en) | 2017-12-15 | 2017-12-15 | Pressure stabilizing method for ventilator fan |
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|---|---|---|---|
| CN201711350792.5A CN108211075B (en) | 2017-12-15 | 2017-12-15 | Pressure stabilizing method for ventilator fan |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110529419A (en) * | 2019-09-02 | 2019-12-03 | 苏州贝舒医疗科技有限公司 | The pressure output control method of noninvasive ventilator blower |
| CN110686824A (en) * | 2018-07-04 | 2020-01-14 | 深圳市美好创亿医疗科技有限公司 | Method for testing pipe network resistance of exhaust device for intelligent mask |
| CN110726163A (en) * | 2019-10-23 | 2020-01-24 | 珠海格力电器股份有限公司 | Range hood and noise reduction device and method thereof |
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