CN103751897A - Device and method for generating high-frequency sinusoidal airflow for ventilator - Google Patents
Device and method for generating high-frequency sinusoidal airflow for ventilator Download PDFInfo
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- CN103751897A CN103751897A CN201410012563.2A CN201410012563A CN103751897A CN 103751897 A CN103751897 A CN 103751897A CN 201410012563 A CN201410012563 A CN 201410012563A CN 103751897 A CN103751897 A CN 103751897A
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Abstract
The invention relates to a device and a method for generating high-frequency sinusoidal airflow for a ventilator. The device comprises a flow control valve and a series of airflow channels on the flow control valve. The airflow channels have different cross-sectional areas, and each channel corresponds to an electromagnetic valve for controlling opening and closing of the channel. The airflow from the series of airflow channels with the different cross-sectional areas is outputted in a digitally combined manner according to discrete sinusoidal signals under the control of an electromagnetic valve group, and waveforms of the outputted airflow have waveform characteristics of the sinusoidal signals. The method includes determining output frequencies, amplitudes and phases. Flow rates of the airflow which flows through all the airflow channels on the flow control valve are distributed according to 2n-1 times a basic flow rate, the basic flow rate is equal to a flow rate of airflow corresponding to the channel with the minimum pore diameter, and the n can be 1, 2, 3 and the like. The device and the method have the advantages that the method is used for controlling output of the sinusoidal airflow, accordingly, the number of operation is low, the response speed is high, control is simple, implementation is easy, the device and the method are used for the high-frequency ventilator so as to improve the service comfort and a treatment effect of the high-frequency ventilator, and the like.
Description
Technical field
The present invention relates to technical field of medical instruments, particularly relate to the sinusoidal air flow-producing device of a kind of respirator high frequency and method.
Background technology
Clinical trial proof adopt high frequency ventilation can be in the situation that low pass air pressure, low ventilation the ventilation of physiology of respiration dead space (even lower than) also can meet the physiological demand of patient's eupnea, can reduce the damage of air pressure to respiratory airway, lung.
In existing undergoing mechanical ventilation in clinical technology, institute's use respirator mainly contains conventional ventilation respirator (CMV:Conversional Mechanical Ventilator) and (HFV:High Frequency Ventilator) breathed in high frequency ventilation; And high frequency ventilation mainly can be divided into high frequency positive pressure ventilation (HFPPV:High Frequency Positive Pressure Ventilation), high-frequency radio frequency ventilation (HFJV:High Frequency Jet Ventilation) and high frequency oscillation (HFOV:High Frequency Oscillating Ventilation).The pulse of the common proportion 2Hz～100Hz of high-frequency air flow, sawtooth waveforms or sinusoidal air-flow ripple.
The mode at present with its high-frequency air flow generation of respirator of high frequency oscillation (HFOV) function is to adopt supersound projector or adopt by reciprocating piston the control signal of their input certain frequencies is produced.Shock range of its output high-frequency air flow is limited to the amplitude of loudspeaker voice coil or frequency limited in the reciprocating stroke of piston, in output high-frequency air flow, also produces certain audio noise.For the high-frequency air flow that comprises other sinusoidal waveform, the aperture that needs complicated control circuit, induction of signal and processing and control algolithm to carry out by-pass valve control could realize, and is easily interfered and exports unnecessary spike air-flow etc.
Summary of the invention
Technical problem to be solved by this invention is to provide the sinusoidal air flow-producing device of a kind of respirator high frequency and method, make sinusoidal high-frequency air flow output be easy to control, and algorithm is simple.
The technical solution adopted for the present invention to solve the technical problems is: provide a kind of respirator high frequency sinusoidal air flow-producing device, comprise constant voltage equipment, control damper, electromagnetic valve group, controller and conventional respirator, the outfan of described constant voltage equipment is connected with the input end interface of control damper, the outfan interface of described control damper is connected with a link of three-way connector, and two other link of described three-way connector is connected with outlet tube with conventional respirator respectively; Described control damper is provided with N gas channel, and each gas channel adopts an electromagnetic valve in electromagnetic valve group to control; The ventilation flow rate of each gas channel is different, and wherein, the ventilation flow rate of the gas channel of minimum-value aperture is defined as basic ventilation flow rate q, and the ventilation flow rate of other gas channel meets 2 subsequently
n-1* q, wherein, n=2,3,4 ... N, N is that on control damper, different gas channels are arranged the ordinal number corresponding to gas channel of rear maximum diameter of hole by ascending order according to aperture; Described controller output discrete control signal is to electromagnetic valve group, and the electromagnetic valve in electromagnetic valve group opens or closes the gas channel of different pore size on control damper under voltage drives.
On described control damper, have N gas channel, total output gas flow flow of each gas channel output gas flow and control damper meets following expression:
The total flow of parallel pipeline=each piping flow is added.
The delivery outlet of described controller adopts parallel way output control signal, and output control signal converts to and in sequential, meets following expression after binary numeral:
Wherein, Δ t is controller minimal sampling time; O (k) is k times of Δ t output valve constantly,
as a sine wave period, the frequency that f is sine wave output, air-flow total flow Q=O (the k) * q of each k times of Δ t control damper output constantly.
The technical solution adopted for the present invention to solve the technical problems is: also provide a kind of respirator high frequency sinusoidal airflow generating method, adopt the sinusoidal air flow-producing device of above-mentioned respirator high frequency, comprise the following steps:
(1) controller completes corresponding sinusoidal wave range value constantly within the regular hour, and to there being delivery outlet to export to the control section of electromagnetic valve group after its analog digital conversion;
(2) electromagnetic valve group is received after control signal, and all electromagnetic valves that correspond to high level activate to open corresponding gas channel output gas flow;
(3) air-flow of all gas channel outputs that are opened merges into the sinusoidal wave air-flow range value corresponding with this moment at the outfan of control damper;
(4) repeating step (1), (2) and (3), until need to stop sine wave output air-flow.
The delivery outlet of described controller adopts parallel way output control signal, and output control signal converts to and in sequential, meets following expression after binary numeral:
Wherein, Δ t is controller minimal sampling time; O (k) is k times of Δ t output valve constantly,
as a sine wave period, the frequency that f is sine wave output, air-flow total flow Q=O (the k) * q of each k times of Δ t control damper output constantly.
Output flow sum when the amplitude of described sinusoidal wave air-flow is opened by all gas channels decides, its peak-to-peak value equals all gas channels output gas flow while opening, or amplitude half of output gas flow when equaling all gas channels and opening.
Beneficial effect
Owing to having adopted above-mentioned technical scheme, the present invention compared with prior art, there is following advantage and good effect: in control damper of the present invention, the electromagnetic valve of all uses, without the aperture of controlling in the course of the work its valve, only need be controlled it by the input of low and high level and whether open or close.At a time the high-frequency air flow flow of output is added by the high-frequency air flow flow of all gas channel outputs that are opened of this moment.Amount of calculation of the present invention is little, real-time, and result output is reliable, is easy to control and realize, and adopting open loop control mode effectively to control the concussion frequency that output high-frequency air flow meets high frequency respirator defined is the requirement of the above sinusoidal wave form of 2Hz; Its device structure is simple, is easy to processing and assembling.
Accompanying drawing explanation
Fig. 1 is that the present invention equips control damper work connection diagram,
In figure: 1 is constant voltage equipment; 2 is input connecting line; 3 is controller; 4 is electromagnetic valve; 5 is control damper intake line interface; 6 is control damper; 7 is control damper output pipe interface; 8 is output pipe; 9 is conventional respirator; 10 is respirator air-flow output pipe; 11 is pipeline airflow pipeline three-way connector; 12 is air-flow outlet tube;
Fig. 2 is the cross-sectional structure schematic diagram that the present invention equips control damper,
In figure: 13 is electromagnetic valve access port; 14 is gas channel;
Fig. 3 is the air-flow output waveform schematic diagram that adopts the inventive method to realize,
In figure: △ t is minimal sampling time interval;
Fig. 4 is that equipment of the present invention and respirator are used in conjunction with output waveform schematic diagram,
In figure: Tin represents inspiratory duration, Tex is expressed as breathing time.
The specific embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment are only not used in and limit the scope of the invention for the present invention is described.In addition should be understood that those skilled in the art can make various changes or modifications the present invention after having read the content of the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.
The present invention has designed a control valve with many gas channels, on each gas channel, to using, has an electromagnetic valve to control the opening and closing of gas channel.The ventilation flow rate of each passage on control valve is different, and according to 2
n-1the ventilation flow rate of times minimum-value aperture designs n=1 successively, n=2 ... until the corresponding ordinal number " N " of the maximum diameter of hole after arranging by aperture ascending order.Parallel port output discrete sine signal value by controller is controlled electromagnetic valve, thereby controls corresponding gas channel, makes output gas flow in sequential, meet the form of discrete sine ripple.
The present invention relates to the sinusoidal air flow-producing device of a kind of respirator high frequency, as shown in Figure 1, comprise constant voltage equipment 1, control damper 6, electromagnetic valve group 4, controller 3 and conventional respirator 9, the outfan of described constant voltage equipment 1 is connected with the input end interface 5 of control damper 6 by input connection tube, the outfan interface 7 of described control damper 6 is connected with a link of three-way connector 11 by output connection tube, two other link of described three-way connector 11, one is connected with conventional respirator 9 by air-flow outlet tube, another is directly connected with outlet tube.Described control damper 6 is provided with N gas channel, and each gas channel adopts an electromagnetic valve in electromagnetic valve group 4 to control; The ventilation flow rate of each gas channel is different, and wherein, the ventilation flow rate of the gas channel of minimum-value aperture is defined as basic ventilation flow rate q, and the ventilation flow rate of other gas channel meets 2 subsequently
n-1* q, wherein, n=2,3,4 ... N, N is that on control damper, different gas channels are arranged the ordinal number corresponding to gas channel of rear maximum diameter of hole by ascending order according to aperture; Described controller output discrete control signal is to electromagnetic valve group, and the electromagnetic valve in electromagnetic valve group opens or closes the gas channel of different pore size on control damper under voltage drives.
Under the verified condition that is laminar flow at air-flow of Aerodynamics, on control damper of the present invention, there is N gas channel, total output gas flow flow of each gas channel output gas flow and control damper meets following formula:
The total flow of parallel pipeline=each piping flow is added.
When the gas channel of getting minimum-value aperture is opened, output gas flow flow is q, and as the bare flow of selected control damper, when the gas channel of time small-bore is opened, corresponding output gas flow flow is 2
1* q, when the gas channel of small-bore is opened again, output gas flow flow is 2
2* q; After arranging by gas channel aperture ascending order the like until output gas flow amount corresponding to the gas channel of maximum diameter of hole is 2
n-1* q.During use, according to the size of total output gas flow flow, choose the control damper of corresponding bare flow q value.
According to the electromagnetic valve in the electromagnetic valve group shown in the corresponding access Fig. 1 of the electromagnetic valve access port of the gas channel of all different pore sizes shown in Fig. 2 13 difference, each solenoid valve control circuit is connected and is controlled by controller with the control delivery outlet of controller.Electromagnetic valve in gas channel 14, electromagnetic valve group meets following table with the corresponding control relation of the control output end mouth of controller:
It is to adopt screw thread docking mode that each electromagnetic valve in electromagnetic valve group is connected with the electromagnetic valve access port of control damper, tightens each other to guarantee sealing property during access.
The N of controller delivery outlet adopts parallel way output control signal, and output port p control signal converts to and in sequential, meets following mathematical formulae after binary numeral:
In formula, Δ t is controller minimal sampling time; O (k) is k times of Δ t output valve constantly,
as a sine wave period, the frequency that f is sine wave output, the air-flow total flow of each k times of Δ t control damper output is constantly Q:
Q＝O(k)×q （ii）
Below in conjunction with Figure of description, one embodiment of the invention is described in further detail:
Shown in Fig. 1, when the equipment of inventing uses, method of attachment is:
Control damper 6 is connected with constant voltage equipment 1 with intake line 2 by input pipe interface 5; Control damper 6 is connected with output pipe 8 by output pipe interface 7; Controller 3 is electrically connected to control damper 6 by electromagnetic valve group 4; Finally by pipeline three-way connector 11, the air-flow output pipe 10 of output pipe 8 and conventional respirator 9 is connected; Air-flow output pipe 12 is connected to another interface of pipeline three-way connector 11 as final air-flow output.
It is as follows that institute's inventive method realizes Time Controller 3 control algorithm processes:
After controller shown in Fig. 13 starts to carry out, first to formula (i) and (ii) Counter k initialization, calculate the sinusoidal signal output valve of corresponding k value, then this output data transaction is become to binary system, again binary data is delivered to delivery outlet P, then enumerator k adds the maximum 2 whether 1 rear k of judgement reaches
n, judge whether that one-period sinewave output completes, if make enumerator k again set to 0 and finish this and calculate, otherwise leap to, finish this calculating.After the Δ t time, controller continues the k of last time and carrys out computing output.
The present invention equips final output gas flow and is comprised of the sinusoidal air-flow of high frequency and common respirator output gas flow, and its point is at pipeline three-way connector; Flowing through of they is respectively:
A. the sinusoidal air-flow of high frequency:
Source of the gas enters the 12--→ output of constant voltage equipment 1--→ intake line 2--→ input pipe interface 5--→ control damper 6--→ output pipe interface 7--→ output pipe 8--→ pipeline three-way connector 11--→ air-flow output pipe.
B. conventional respirator 9 output gas flows:
The group of electromagnetic valve shown in Fig. 14 is transfused to be controlled after data; The electromagnetic valve that corresponding input control current potential is high level is opened and is made the corresponding air-flow of gas channel corresponding in Fig. 2 13 output being activated electromagnetic valve, its air-flow wave in sequential as shown in Figure 3; The corresponding respirator high frequency oscillation constantly of output air flow rate after the output of all air-flows is added in output pipe shown in Fig. 18, pipeline three-way connector 11 and output pipe 12, its output gas flow wave in sequential as shown in Figure 4.Wherein, the output flow sum when amplitude of sinusoidal wave air-flow is opened by all gas channels decides, its peak-to-peak value equals all gas channels output gas flow while opening, or amplitude half of output gas flow when equaling all gas channels and opening.
The invention process method adopts open loop control mode to control the air-flow output flow of gas channel 13, does not need to adopt any sensor and signal processing circuit thereof to feed back output and controls, and operand is little, reliable results.
Claims (6)
1. the sinusoidal air flow-producing device of a respirator high frequency, comprise constant voltage equipment, control damper, electromagnetic valve group, controller and conventional respirator, it is characterized in that, the outfan of described constant voltage equipment is connected with the input end interface of control damper, the outfan interface of described control damper is connected with a link of three-way connector, and two other link of described three-way connector is connected with outlet tube with conventional respirator respectively; Described control damper is provided with N gas channel, and each gas channel adopts an electromagnetic valve in electromagnetic valve group to control; The ventilation flow rate of each gas channel is different, and wherein, the ventilation flow rate of the gas channel of minimum-value aperture is defined as basic ventilation flow rate q, and the ventilation flow rate of other gas channel meets 2 subsequently
n-1* q, wherein, n=2,3,4 ... N, N is that on control damper, different gas channels are arranged the ordinal number corresponding to gas channel of rear maximum diameter of hole by ascending order according to aperture; Described controller output discrete control signal is to electromagnetic valve group, and the electromagnetic valve in electromagnetic valve group opens or closes the gas channel of different pore size on control damper under voltage drives.
2. the sinusoidal air flow-producing device of respirator high frequency according to claim 1, is characterized in that on described control damper, there be N gas channel, and total output gas flow flow of each gas channel output gas flow and control damper meets following expression:
The total flow of parallel pipeline=each piping flow is added.
3. the sinusoidal air flow-producing device of respirator high frequency according to claim 1, is characterized in that, the delivery outlet of described controller adopts parallel way output control signal, and output control signal converts to and in sequential, meets following expression after binary numeral:
Wherein, Δ t is controller minimal sampling time; O (k) is k times of Δ t output valve constantly,
as a sine wave period, the frequency that f is sine wave output, air-flow total flow Q=O (the k) * q of each k times of Δ t control damper output constantly.
4. the sinusoidal airflow generating method of respirator high frequency, is characterized in that, adopts the sinusoidal air flow-producing device of respirator high frequency as claimed in claim 1, comprises the following steps:
(1) controller completes corresponding sinusoidal wave range value constantly within the regular hour, and to there being delivery outlet to export to the control section of electromagnetic valve group after its analog digital conversion;
(2) electromagnetic valve group is received after control signal, and all electromagnetic valves that correspond to high level activate to open corresponding gas channel output gas flow;
(3) air-flow of all gas channel outputs that are opened merges into the sinusoidal wave air-flow range value corresponding with this moment at the outfan of control damper;
(4) repeating step (1), (2) and (3), until need to stop sine wave output air-flow.
5. the sinusoidal airflow generating method of respirator high frequency according to claim 4, is characterized in that, the delivery outlet of described controller adopts parallel way output control signal, and output control signal converts to and in sequential, meets following expression after binary numeral:
Wherein, Δ t is controller minimal sampling time; O (k) is k times of Δ t output valve constantly,
as a sine wave period, the frequency that f is sine wave output, air-flow total flow Q=O (the k) * q of each k times of Δ t control damper output constantly.
6. the sinusoidal airflow generating method of respirator high frequency according to claim 4, it is characterized in that, output flow sum when the amplitude of described sinusoidal wave air-flow is opened by all gas channels decides, its peak-to-peak value equals all gas channels output gas flow while opening, or amplitude half of output gas flow when equaling all gas channels and opening.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106075684A (en) * | 2016-08-09 | 2016-11-09 | 山东省医疗器械产品质量检验中心 | The sinusoidal feeder of variable ventilation and high emulation HME moisture loss tester |
| CN112704789A (en) * | 2020-12-29 | 2021-04-27 | 湖南明康中锦医疗科技发展有限公司 | High-frequency oscillation respiratory airflow generation method and respiratory support equipment |
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| US4632107A (en) * | 1985-07-11 | 1986-12-30 | Nimbus, Inc. | High-frequency jet ventilator |
| US4838257A (en) * | 1987-07-17 | 1989-06-13 | Hatch Guy M | Ventilator |
| CN2061053U (en) * | 1989-11-24 | 1990-08-29 | 徐正惠 | High frequency oscillating respirator |
| CN1074620A (en) * | 1992-04-18 | 1993-07-28 | 北京航空航天大学 | The method for designing and the instrument of the positive/negative pressure high-frequency oscillation breath machine that a kind of overall process is supported |
| JP2001170178A (en) * | 1999-12-21 | 2001-06-26 | Suzuki Motor Corp | High frequency respirator |
| GB2485417A (en) * | 2010-11-15 | 2012-05-16 | Frede Oellgaard Jensen | Reversible proportional four-way valve |
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2014
- 2014-01-10 CN CN201410012563.2A patent/CN103751897B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4632107A (en) * | 1985-07-11 | 1986-12-30 | Nimbus, Inc. | High-frequency jet ventilator |
| US4838257A (en) * | 1987-07-17 | 1989-06-13 | Hatch Guy M | Ventilator |
| CN2061053U (en) * | 1989-11-24 | 1990-08-29 | 徐正惠 | High frequency oscillating respirator |
| CN1074620A (en) * | 1992-04-18 | 1993-07-28 | 北京航空航天大学 | The method for designing and the instrument of the positive/negative pressure high-frequency oscillation breath machine that a kind of overall process is supported |
| JP2001170178A (en) * | 1999-12-21 | 2001-06-26 | Suzuki Motor Corp | High frequency respirator |
| GB2485417A (en) * | 2010-11-15 | 2012-05-16 | Frede Oellgaard Jensen | Reversible proportional four-way valve |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106075684A (en) * | 2016-08-09 | 2016-11-09 | 山东省医疗器械产品质量检验中心 | The sinusoidal feeder of variable ventilation and high emulation HME moisture loss tester |
| CN106075684B (en) * | 2016-08-09 | 2018-05-04 | 山东省医疗器械产品质量检验中心 | Sinusoidal feeder and high emulation HME the moisture loss testers of variable throughput |
| CN112704789A (en) * | 2020-12-29 | 2021-04-27 | 湖南明康中锦医疗科技发展有限公司 | High-frequency oscillation respiratory airflow generation method and respiratory support equipment |
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Inventor after: Yuan Yueyang Inventor after: Yang Chongchang Inventor after: Zhang Qiaofeng Inventor after: Di Sidi Inventor after: Wang Chun Inventor after: Ning Ning Inventor after: Jiu Dong Inventor after: Zheng Pingyang Inventor before: Yuan Yueyang Inventor before: Yang Chongchang |
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