CN105275845A - Draught fan - Google Patents
Draught fan Download PDFInfo
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- CN105275845A CN105275845A CN201510846419.3A CN201510846419A CN105275845A CN 105275845 A CN105275845 A CN 105275845A CN 201510846419 A CN201510846419 A CN 201510846419A CN 105275845 A CN105275845 A CN 105275845A
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- impeller
- blower fan
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- shell
- motor
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Abstract
The invention relates to the technical field of medical instruments, in particular to a draught fan. The draught fan comprises a shell, an impeller and a motor. The shell is provided with an air inlet and an air outlet. The impeller is located inside the shell and close to the air inlet. The output shaft of the motor is in drive connection with the impeller, so that air flows along the air inlet towards the air outlet. The space used for containing air inside the shell is an in-shell air flowing space. The ration range of the volume of the in-shell air flowing space to the volume of the impeller is 15-30. The shell is provided with an air outlet flue communicated with the air outlet. Multiple arc grooves are evenly formed in the inner wall of the air outlet flue in the air outlet flowing direction. The stability of output pressure and flow of the draught fan is improved.
Description
Technical field
The present invention relates to technical field of medical instruments, especially relate to a kind of blower fan.
Background technique
Blower fan is widely used in medical field, especially respiratory machine.In current clinical medicine, respiratory machine is as the effective means of an energy artificial substituting expiratory positive airway pressure function, be commonly used in the respiratory failure caused by a variety of causes, the management of the anesthesia respiration during major operation, Breathing Suppotion treatment and emergency resuscitation, in Modern Medical Field, occupied very important position.Respiratory machine is that one can play prevention and therapy respiratory failure, reduces complication, saves and extend the vital medical equipment of patients ' lives.
But the pressure of existing blower fan output and instability of flow, directly affect the quality of the medical equipment such as respiratory machine, even impact is saved and is extended patients ' lives.
Summary of the invention
The object of the present invention is to provide a kind of blower fan, with the stability of the pressure and flow that improve the output of blower fan.
The invention provides a kind of blower fan, comprise housing, impeller and motor; Described housing is provided with intake grill and exhaust outlet;
Described impeller is positioned at the inside of described housing, and near described intake grill;
The output shaft of described motor drives and connects described impeller, flows along described intake grill towards the direction of described exhaust outlet to make gas;
The inside of described housing is gas flow space in shell for holding the space of gas; In described shell, the ratio range of the volume of gas flow space and the volume of described impeller is 15-30;
Described housing has exhaust air flue, and described exhaust air flue is communicated with described exhaust outlet;
Go out the direction of wind flow along described gas, the inwall of described exhaust air flue is evenly provided with multiple arc groove.
Further, in described shell, the ratio range of the volume of gas flow space and the volume of described impeller is 20-24.
Further, described intake grill is arranged along the axis of described impeller; Described exhaust outlet is arranged along the radial direction of described impeller.
Further, described air inlet is provided with conducting element, and described conducting element is fixedly connected with the outer surface of described housing;
Described conducting element is along the axial helically wire of the output shaft of described motor.
Further, described impeller comprises chassis and is arranged on the multiple blades on described chassis; Described multiple blade is arranged in even, interval around the center on described chassis;
The height of described blade near the one end at the center on described chassis is greater than the height of the other end at the center away from described chassis;
Described blade and described chassis are that rounding off is connected.
Further, the outer surface of described housing is installed with locating column and shockproof location protrusion rib respectively; Rib is protruded ringwise in described shockproof location.
Further, described housing comprises upper shell and lower shell body; Described intake grill is positioned on described lower shell body, and described exhaust outlet is positioned at the joint of described upper shell and described lower shell body;
Described upper shell is evenly provided with multiple described locating column, and described lower shell body is provided with described shockproof location and protrudes rib; The bearing of trend that rib is protruded in described shockproof location is consistent with the axial direction of described locating column;
Described upper shell and described lower shell body are fastened and connected by buckle.
Further, described upper shell is provided with the groove adapted with described motor, and described motor is fixedly mounted in described groove;
Shock absorber part is provided with between described motor and described groove.
Further, the surface of contact of described upper shell and described lower shell body is provided with seal groove, and described seal groove extends along described surface of contact; Seal ring is provided with in described seal groove.
Further, described motor adopts brushless electric machine; The rotating speed of described brushless electric machine is 6000rpm-20000rpm;
The material of described housing is PC plastics; The inner chamber of described housing is vertical cyclindrical shape; The quantity of described arc groove is 4.
Blower fan provided by the invention operationally, rotate, and impeller makes gas enter gas flow space in shell from intake grill, then flows out from exhaust outlet by the output shaft drives impeller of motor; In conjunction with the high speed rotating speed of motor, be converted to the principle of potential energy according to kinetic energy, gas is accelerated by the impeller of High Rotation Speed, then slow down in gas flow space in the shell of certain volume, change the flow direction, make kinetic energy convert potential energy to, this potential energy is pressure energy; Wherein, when in shell, the ratio range of the volume of gas flow space and the volume of impeller is 15-30, the pressure that gas during the work of this blower fan exports from exhaust outlet and flow more stable, more meet the requirement of needed by human body, especially meet the demand of patient to medical apparatuss such as respiratory machines; In addition, when the inwall of exhaust air flue evenly being arranged multiple arc groove, add the friction area exporting gas and air-out passage, output gas is distributed in exhaust air flue more even, the central gas stream flow velocity solving the exhaust air flue of cylindrical, square column type is very fast, near the slower problem of the air-flow velocity of exhaust air flue inwall, the air-flow that order exports is more even, further increases the stability of the output flow of blower fan.
Accompanying drawing explanation
In order to be illustrated more clearly in the specific embodiment of the invention or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The plan view of the blower fan that Fig. 1 provides for the embodiment of the present invention;
The plan view of the blower fan that Fig. 2 provides for the embodiment of the present invention;
The plan view of the upper shell of the blower fan that Fig. 3 provides for the embodiment of the present invention;
Fig. 4 is the plan view of the upper shell shown in Fig. 3;
The plan view of the lower shell body of the blower fan that Fig. 5 provides for the embodiment of the present invention;
Fig. 6 is the plan view of the lower shell body shown in Fig. 5;
The plan view of the impeller of the blower fan that Fig. 7 provides for the embodiment of the present invention;
Fig. 8 is the plan view of the impeller shown in Fig. 7;
The plan view of the exhaust outlet of the blower fan that Fig. 9 provides for the embodiment of the present invention.
Reference character:
1-housing; Gas flow space in 11-shell; 12-locating column;
13-protrudes rib in shockproof location; 14-upper shell; 141-groove;
15-lower shell body; 2-impeller; 21-chassis;
22-blade; 3-motor; 4-intake grill;
5-exhaust outlet; 6-conducting element 7-buckle;
8-exhaust air flue; 81-arc groove.
Embodiment
Be clearly and completely described technological scheme of the present invention below in conjunction with accompanying drawing, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In describing the invention, it should be noted that, orientation or the position relationship of the instruction such as term " " center ", " on ", D score, "left", "right", " vertically ", " level ", " interior ", " outward " they be based on orientation shown in the drawings or position relationship; be only the present invention for convenience of description and simplified characterization; instead of instruction or imply the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second ", " the 3rd " only for describing object, and can not be interpreted as instruction or hint relative importance.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
Embodiment
Shown in Fig. 1-Fig. 9, present embodiments provide a kind of blower fan; The plan view of the blower fan that Fig. 1 provides for the present embodiment, Fig. 2 is the plan view of blower fan; Fig. 3 is the plan view of upper shell, and Fig. 4 is the plan view of upper shell; Fig. 5 is the plan view of lower shell body, and Fig. 6 is the plan view of lower shell body; Fig. 7 is the plan view of impeller, and Fig. 8 is the plan view of impeller; Fig. 9 is the plan view of the exhaust outlet of blower fan; In order to indication structure clearly, Fig. 1, Fig. 7 are sectional view.
Shown in Fig. 1-Fig. 9, the blower fan that the present embodiment provides, comprises housing 1, impeller 2 and motor 3; Housing 1 is provided with intake grill 4 and exhaust outlet 5.
Impeller 2 is positioned at the inside of housing 1, and near intake grill 4.
The output shaft of motor 3 drives and connects impeller 2, flows along intake grill 4 towards the direction of exhaust outlet 5 to make gas.
The inside of housing 1 is gas flow space 11 in shell for holding the space of gas; In shell, the ratio range of the volume of gas flow space 11 and the volume of impeller 2 is 15-30.
Housing 1 has exhaust air flue 8, and exhaust air flue 8 is communicated with exhaust outlet 5.
Go out the direction of wind flow along gas, the inwall of exhaust air flue 8 is evenly provided with multiple arc groove 81.The quantity of arc groove 81 can be such as 2,3,4,5,8 etc., and preferably, the quantity of arc groove 81 is 4.
During the work of blower fan described in the present embodiment, the output shaft drives impeller 2 of motor 3 is rotated, and impeller 2 makes gas enter gas flow space 11 in shell from intake grill 4, then flows out from exhaust outlet 5; In conjunction with the high speed rotating speed of motor 3, be converted to the principle of potential energy according to kinetic energy, gas accelerated by the impeller 2 of High Rotation Speed, then slows down in gas flow space 11 in the shell of certain volume, change the flow direction, make kinetic energy convert potential energy to, this potential energy is pressure energy; Wherein, when in shell, the ratio range of the volume of gas flow space 11 and the volume of impeller 2 is 15-30, the pressure that gas during the work of this blower fan exports from exhaust outlet 5 and flow more stable, more meet the requirement of needed by human body, especially meet the demand of patient to medical apparatuss such as respiratory machines; In addition, when the inwall of exhaust air flue 8 evenly being arranged multiple arc groove 81, add the friction area exporting gas and air-out passage 8, output gas is distributed in exhaust air flue 8 more even, the central gas stream flow velocity solving the exhaust air flue of cylindrical, square column type is very fast, near the slower problem of the air-flow velocity of exhaust air flue inwall, the air-flow that order exports is more even, further increases the stability of the output flow of blower fan.
In shell, gas flow space 11 also has and carries out the effect of dispelling the heat to the motor 3 run up, and extends the working life of motor 3, makes be more than 53000 hours the working life of motor 3.
Preferably, in shell, the ratio range of the volume of gas flow space 11 and the volume of impeller 2 is 20-24; The pressure that when this ratio range further increases the work of described blower fan, gas exports from exhaust outlet 5 and the stability of flow, met the requirement of needed by human body further, especially met the demand of patient to medical apparatuss such as respiratory machines.
Wherein, motor 3 adopts brushless electric machine, and preferably, motor 3 adopts brshless DC motor; The rotating speed of brushless electric machine is 6000rpm-20000rpm, so that the output shaft high-speed driving impeller 2 of motor 3 rotates, forms delivery pressure and the flow of the gas being applicable to needed by human body; Table one lists the corresponding numerical value between the delivery pressure of the rotating speed of part motor 3 and the exhaust outlet 5 of blower fan, output flow.
This fan motor of table one rotating speed and delivery pressure, output flow parameter
In the possibility of this enforcement, intake grill 4 is arranged along the axis of impeller 2; Exhaust outlet 5 is arranged along the radial direction of impeller 2; To be converted to the principle of potential energy according to kinetic energy, the impeller 2 of High Rotation Speed is utilized to be accelerated by gas, gas is from axially entering impeller 2, radial output is changed over when flowing through gas flow space 11 in impeller 2 and shell, because of in shell in gas flow space 11 gas and changing flow direction cause deceleration further, and kinetic energy is converted to pressure energy by decelerating effect further, be more convenient to be formed the pressure and flow that meet needed by human body.
In the possibility of this enforcement, intake grill 4 place is provided with conducting element 6, and conducting element 6 is fixedly connected with the outer surface of housing 1; Conducting element 6 is along the axial helically wire of the output shaft of motor 3.The conducting element 6 of zigzag shape can guide gas to flow into intake grill 4 better, intake grill 4 is entered with what make gas spiral, turning round of wide-angle is not had to make the inflow path of gas, local eddy currents can not be produced, meet the movement locus of gas, the noise produced when can reduce gas flow, can also increase and contact air inflow with impeller 2.
In the possibility of this enforcement, multiple blades 22 that impeller 2 comprises chassis 21 and is arranged on chassis 21; Multiple blade 22 is arranged in even, interval around the center on chassis 21; Be convenient to stability when improving impeller 2 High Rotation Speed, reduce the noise brought because impeller 2 rotates instability, also extend the working life of impeller 2.Preferably, blade 22 is ten; Preferably, blade 22 and chassis 21 are formed in one, and are convenient to the production and processing of impeller 2.
The height of blade 22 near the one end at the center on chassis 21 is greater than the height of the other end at the center away from chassis 21; So that gas to flow in shell in gas flow space 11 along blade 22.
Blade 22 is connected in rounding off with chassis 21; To reduce the frictional force between impeller 2 and gas, and then the noise produced when reducing gas flow, and reduce the unnecessary energy consumption of gas in the generation of impeller 2 surface.
In the possibility of this enforcement, the outer surface of housing 1 is installed with locating column 12 respectively and rib 13 is protruded in shockproof location; Rib 13 is protruded ringwise in shockproof location; The quantity of locating column 12 is 1 or multiple, such as, can be 1,2,3,5 etc.; By arranging locating column 12 and shockproof location protrusion rib 13, better to locate, fix described blower fan, the vibrations produced when reducing blower fan work, thus reduction shakes the noise produced.
In the possibility of this enforcement, housing 1 comprises upper shell 14 and lower shell body 15, so that the assembling of blower fan; Intake grill 4 is positioned on lower shell body 15, and exhaust outlet 5 is positioned at the joint of upper shell 14 and lower shell body 15.
Upper shell 14 is evenly provided with multiple locating column 12, and lower shell body 15 is provided with shockproof location and protrudes rib 13; The bearing of trend that rib 13 is protruded in shockproof location is consistent with the axial direction of locating column 12.Shockproof location is protruded rib 13 and is arranged on upper-lower casing 15 with locating column 12 is corresponding respectively, makes location, fixing described blower fan more accurately, is convenient to the vibrations produced when reducing blower fan work.
In the possibility of this enforcement, upper shell 14 and lower shell body 15 are fastened and connected by buckle 7.Adopt buckle 7 formula Placement to install lower shell body 15, avoid and adopt screw to connect because stubborn screw is firmly too violent, to be ftractureed in joint, twist screw and kick the beam and cause poorly sealed; Also be convenient to installation when producing in batches, simplify mounting process, most of workman can be made to learn very soon and standard compliant product is installed out; The error that each side is occurred drops to extremely low; Preferably, the quantity of buckle 7 is four, is evenly arranged on blower fan surrounding.
In the possibility of this enforcement, upper shell 14 is provided with the groove 141 adapted with motor 3, and motor 3 is fixedly mounted in groove 141; To reduce the volume of described blower fan, be convenient to the miniaturization of blower fan volume.
Shock absorber part (belonging to prior art, not shown) is provided with, the noise produced because of vibrations between motor 3 and housing 1 during to reduce work between motor 3 and groove 141.Described shock absorber part can be such as rubber pad, silicagel pad, spring etc.
In the possibility of this enforcement, upper shell 14 is provided with seal groove (not shown) with the surface of contact of lower shell body 15, and seal groove extends along surface of contact; Seal ring (belonging to prior art, not shown) is provided with in seal groove.Prevent the pressure in housing 1 from being revealed by the connecting sewing between upper-lower casing 15 by seal ring, also namely prevent the gas in housing 1 from being revealed by the connecting sewing between upper-lower casing 15, ensured that described blower fan exports pressure and the flow of gas.The material of described seal ring can be such as rubber, silica gel etc.
In the possibility of this enforcement, the material of housing 1 is PC plastics.The blower fan adopted in the market is mostly ABS, the material such as mixture, metal of ABS and PC is made, and this blower fan adopts the upper lower casing of full PC material, product highly transparent, is convenient to some faults, the problem that find blower fan; During flabellum problem as found that there is, or there is exception in flabellum or casing, can with eye observation, without overhaul.
In the possibility of this enforcement, the inner chamber of housing 1 is that the inner chamber of vertical cyclindrical shape or housing 1 is approximately vertical cyclindrical shape; Namely the inner chamber of upper shell 14 and lower shell body 15 is vertical cyclindrical shape, or the inner chamber of upper shell 14 and lower shell body 15 is all approximately vertical cyclindrical shape; Namely also the profile of gas flow space 11 is vertical cyclindrical shape or is approximately vertical cyclindrical shape in shell; So that under the prerequisite ensureing gas flow space 11 in certain shell, reduce the volume of blower fan; To reduce the resistance of gas gas flow space 11 in shell.
In order to the described blower fan of understanding clearly, below illustrate:
Blower fan adopts the housing of vertical cyclindrical shape, and the diameter of blower fan is 85mm-100mm, is highly 60mm-80mm.
Housing integral diameter is 85mm-100mm, is highly 35mm-45mm; Thickness of shell is 1.5mm-3mm.
Housing comprises upper shell and lower shell body, and upper shell and lower shell body are fastened and connected by square combination buckle, and the quantity of square combination buckle is four.
Upper shell is installed with three locating columns; Locating column diameter is 8mm-10mm.
Intake grill is circular, diameter 15mm-25mm.
Exhaust outlet is circular, diameter 15mm-25mm.
Last it is noted that above each embodiment is only in order to illustrate technological scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technological scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristics; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technological scheme.
Claims (10)
1. a blower fan, is characterized in that, comprises housing, impeller and motor; Described housing is provided with intake grill and exhaust outlet;
Described impeller is positioned at the inside of described housing, and near described intake grill;
The output shaft of described motor drives and connects described impeller, flows along described intake grill towards the direction of described exhaust outlet to make gas;
The inside of described housing is gas flow space in shell for holding the space of gas; In described shell, the ratio range of the volume of gas flow space and the volume of described impeller is 15-30;
Described housing has exhaust air flue, and described exhaust air flue is communicated with described exhaust outlet;
Go out the direction of wind flow along described gas, the inwall of described exhaust air flue is evenly provided with multiple arc groove.
2. blower fan according to claim 1, is characterized in that, in described shell, the ratio range of the volume of gas flow space and the volume of described impeller is 20-24.
3. blower fan according to claim 1 and 2, is characterized in that, described intake grill is arranged along the axis of described impeller; Described exhaust outlet is arranged along the radial direction of described impeller.
4. blower fan according to claim 3, is characterized in that, described air inlet is provided with conducting element, and described conducting element is fixedly connected with the outer surface of described housing;
Described conducting element is along the axial helically wire of the output shaft of described motor.
5. blower fan according to claim 3, is characterized in that, described impeller comprises chassis and is arranged on the multiple blades on described chassis; Described multiple blade is arranged in even, interval around the center on described chassis;
The height of described blade near the one end at the center on described chassis is greater than the height of the other end at the center away from described chassis;
Described blade and described chassis are that rounding off is connected.
6. blower fan according to claim 3, is characterized in that, the outer surface of described housing is installed with locating column respectively and rib is protruded in shockproof location; Rib is protruded ringwise in described shockproof location.
7. blower fan according to claim 6, is characterized in that, described housing comprises upper shell and lower shell body; Described intake grill is positioned on described lower shell body, and described exhaust outlet is positioned at the joint of described upper shell and described lower shell body;
Described upper shell is evenly provided with multiple described locating column, and described lower shell body is provided with described shockproof location and protrudes rib; The bearing of trend that rib is protruded in described shockproof location is consistent with the axial direction of described locating column;
Described upper shell and described lower shell body are fastened and connected by buckle.
8. blower fan according to claim 7, is characterized in that, described upper shell is provided with the groove adapted with described motor, and described motor is fixedly mounted in described groove;
Shock absorber part is provided with between described motor and described groove.
9. blower fan according to claim 7, is characterized in that, the surface of contact of described upper shell and described lower shell body is provided with seal groove, and described seal groove extends along described surface of contact; Seal ring is provided with in described seal groove.
10. blower fan according to claim 1 and 2, is characterized in that, described motor adopts brushless electric machine; The rotating speed of described brushless electric machine is 6000rpm-20000rpm;
The material of described housing is PC plastics; The inner chamber of described housing is vertical cyclindrical shape;
The quantity of described arc groove is 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510846419.3A CN105275845B (en) | 2015-11-27 | 2015-11-27 | Blower fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510846419.3A CN105275845B (en) | 2015-11-27 | 2015-11-27 | Blower fan |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105275845A true CN105275845A (en) | 2016-01-27 |
| CN105275845B CN105275845B (en) | 2017-11-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510846419.3A Active CN105275845B (en) | 2015-11-27 | 2015-11-27 | Blower fan |
Country Status (1)
| Country | Link |
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| CN (1) | CN105275845B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106593900A (en) * | 2016-12-06 | 2017-04-26 | 卢璐娇 | Synchronously-cooled axial flow fan |
| FR3106065A1 (en) * | 2020-01-10 | 2021-07-16 | Air Liquide Medical Systems | Radial Mount Micro Blower for Medical Ventilator |
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| JPS5982922A (en) * | 1982-11-04 | 1984-05-14 | Hitachi Ltd | Large-sized filter-type dust collector |
| CN1763381A (en) * | 2004-10-22 | 2006-04-26 | Lg电子株式会社 | Blower and design method of discharge port thereof |
| CN204226231U (en) * | 2014-09-25 | 2015-03-25 | 北京德海尔医疗技术有限公司 | Portable fan |
| CN204327595U (en) * | 2014-09-25 | 2015-05-13 | 北京德海尔医疗技术有限公司 | Small-sized fan used for respirators |
| CN104981614A (en) * | 2013-02-11 | 2015-10-14 | 液体空气医疗系统公司 | Turbine for a breathing assistance apparatus with improved gas tightness |
| CN105020174A (en) * | 2015-07-23 | 2015-11-04 | 深圳市帝迈生物技术有限公司 | Small low-noise centrifugal fan and breathing machine comprising same |
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2015
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| JPS5982922A (en) * | 1982-11-04 | 1984-05-14 | Hitachi Ltd | Large-sized filter-type dust collector |
| CN1763381A (en) * | 2004-10-22 | 2006-04-26 | Lg电子株式会社 | Blower and design method of discharge port thereof |
| CN104981614A (en) * | 2013-02-11 | 2015-10-14 | 液体空气医疗系统公司 | Turbine for a breathing assistance apparatus with improved gas tightness |
| CN204226231U (en) * | 2014-09-25 | 2015-03-25 | 北京德海尔医疗技术有限公司 | Portable fan |
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| CN106593900A (en) * | 2016-12-06 | 2017-04-26 | 卢璐娇 | Synchronously-cooled axial flow fan |
| CN106593900B (en) * | 2016-12-06 | 2019-01-25 | 卢璐娇 | The axial flow blower of synchronous heat dissipation |
| FR3106065A1 (en) * | 2020-01-10 | 2021-07-16 | Air Liquide Medical Systems | Radial Mount Micro Blower for Medical Ventilator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105275845B (en) | 2017-11-07 |
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