CN106150987A - Micro air pump - Google Patents
Micro air pump Download PDFInfo
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- CN106150987A CN106150987A CN201510160199.9A CN201510160199A CN106150987A CN 106150987 A CN106150987 A CN 106150987A CN 201510160199 A CN201510160199 A CN 201510160199A CN 106150987 A CN106150987 A CN 106150987A
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- air pump
- micro air
- valve seat
- exhaustor
- base assembly
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Abstract
The invention discloses a kind of micro air pump, micro air pump includes: the pump housing, and the pump housing includes upper cover and valve seat, valve seat is located at below upper cover, it is provided with outlet passageway on valve seat, between described upper cover and described valve seat, is formed with discharge chamber, above cover and be provided with the exhaustor connected with discharge chamber；Being located at the base assembly below valve seat, be formed with air storing cavity in base assembly, air storing cavity is connected outside base assembly by the air intake structure being arranged on base assembly；Piston diaphragm, piston diaphragm is located at inside base assembly, piston diaphragm is formed multiple be downwardly concaved add deep, limit plunger shaft in adding deep, piston diaphragm be provided with the inlet channel for connecting plunger shaft and air storing cavity；It is arranged on the air-intake valve plate at inlet channel and is arranged on the valve block of giving vent to anger at outlet passageway；Wherein, the volume of discharge chamber is V, and volume V meets relational expression: 4cc≤V≤10cc.Micro air pump according to embodiments of the present invention, the gas flowing in micro air pump steadily and links up, and the pressure pulsations of micro air pump is less.
Description
Technical field
The present invention relates to a kind of micro air pump.
Background technology
In correlation technique, the flowing of gas in micro air pump is discontinuous, and produces pulsation, so causes the micro air pump cannot
Apply and at some, gas flow stability is required in higher device.
Summary of the invention
It is contemplated that solve one of above-mentioned technical problem of the prior art the most to a certain extent.To this end, the present invention
One purpose is to propose a kind of micro air pump, and the gas flowing in this micro air pump steadily and links up, and micro air pump
Pressure pulsations is less.
Micro air pump according to embodiments of the present invention, including: the pump housing, the described pump housing includes that upper cover and valve seat, described valve seat set
Below described upper cover, described valve seat is provided with outlet passageway, between described upper cover and described valve seat, is formed with discharge chamber,
Cover on described and be provided with the exhaustor connected with described discharge chamber；Base assembly, described base assembly is located under described valve seat
Side, is formed with air storing cavity in described base assembly, described air storing cavity is connected by the air intake structure being arranged on described base assembly
Outside logical base assembly；Piston diaphragm, described piston diaphragm is located at below described valve seat and is positioned at inside described base assembly,
Be formed on described piston diaphragm multiple be downwardly concaved add deep, described in add deep in limit plunger shaft, described piston membrane
The inlet channel for connecting described plunger shaft and air storing cavity it is provided with on sheet；Air-intake valve plate and valve block of giving vent to anger, described intake valve
Sheet be arranged at described inlet channel and described in valve block of giving vent to anger be arranged at described outlet passageway；Wherein, the appearance of described discharge chamber
Amass and meet relational expression: 4cc≤V≤10cc for V, described volume V.
Micro air pump according to embodiments of the present invention, the gas flowing in micro air pump steadily and links up, the pressure of micro air pump
Pulse less, thus micro air pump goes for the device (such as electric sphygmomanometer) stricter to gas flow stability
In, improve the versatility of micro air pump further.
It addition, can also have a techniques below feature according to the micro air pump of the present invention:
In some examples of the present invention, described volume V meets relational expression: 4cc≤V≤7cc further.
In some examples of the present invention, described volume V meets relational expression: 5.5cc≤V≤6.5cc further.
In some examples of the present invention, a length of L of described exhaustor, described length L meet relational expression: 10mm≤L≤
20mm。
In some examples of the present invention, at least one of cross-sectional area of the cavity in described exhaustor is S, described transversal
Area S meets relational expression: π (0.3/2)2mm2≤S≤π(0.7/2)2mm2。
In some examples of the present invention, at least one of cross-sectional area of the cavity in described exhaustor is S, described transversal
Area S meets relational expression: π (0.3/2)2mm2≤S≤π(1/2)2mm2。
In some examples of the present invention, described exhaustor is revolving body.
In some examples of the present invention, the internal face of described exhaustor is uiform section structure.
In some examples of the present invention, the lower end of described exhaustor downwardly extends the inner top surface beyond described discharge chamber.
In some examples of the present invention, described exhaustor is into a single integrated structure with described upper cover.
In some examples of the present invention, described exhaustor includes upper portion and hypomere part, and described upper portion is arranged on
On the upper surface of described upper cover, described hypomere part entirety is accommodated in described discharge chamber, and the external diameter of described hypomere part
It is smaller in size than the outside dimension of described upper portion.
In some examples of the present invention, described upper cover be tubular and towards described valve seat side open wide, described upper cover includes:
Lid body and annular perisporium, described annular perisporium is arranged on described lid body and extends towards described valve seat, described discharge chamber
Limited by the described annular internal face of perisporium and the lower surface of described lid body.
Accompanying drawing explanation
Fig. 1 is the explosive view of micro air pump according to embodiments of the present invention；
Fig. 2 is valve seat and the explosive view of piston diaphragm of micro air pump according to embodiments of the present invention；
Fig. 3 is the sectional view of micro air pump according to embodiments of the present invention；
Fig. 4 is the structural representation of the exhaustor of micro air pump according to embodiments of the present invention.
Reference:
Micro air pump 100；
The pump housing 10；Upper cover 11；Lid body 111；Annular perisporium 112；Valve seat 12；Outlet passageway 13；Discharge chamber 14；Row
Trachea 15；Upper portion 151；Hypomere part 152；Cavity 153；Inlet channel 16；
Base assembly 20；Air storing cavity 21；Air intake structure 22；
Piston diaphragm 30；Add deep 31；Plunger shaft 32；
Air-intake valve plate 40；Give vent to anger valve block 50；Driving means 60.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most identical
Or similar label represents same or similar element or has the element of same or like function.Retouch below with reference to accompanying drawing
The embodiment stated is exemplary, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.
In describing the invention, it is to be understood that term " " center ", " longitudinally ", " laterally ", " length ", " width ",
" thickness ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ",
Orientation or the position relationship of the instruction such as " outward ", " clockwise ", " counterclockwise " are based on orientation shown in the drawings or position relationship,
It is for only for ease of the description present invention and simplifies description rather than instruction or imply that the device of indication or element must have specific
Orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed
Or implicitly include one or more this feature.In describing the invention, " multiple " are meant that at least two,
Such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, term " install ", " being connected ", " connection ", " fixing "
Should be interpreted broadly Deng term, connect for example, it may be fixing, it is also possible to be to removably connect, or integral；Can be
It is mechanically connected, it is also possible to be to electrically connect maybe can communicate with one another；Can be to be joined directly together, it is also possible to indirect by intermediary
It is connected, can be connection or the interaction relationship of two elements of two element internals.Ordinary skill people for this area
For Yuan, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature it " on " or D score
Can include that the first and second features directly contact, it is also possible to include that the first and second features are not directly contact but logical
Cross the other characterisation contact between them.And, fisrt feature second feature " on ", " top " and " on
Face " include that fisrt feature directly over second feature and oblique upper, or is merely representative of fisrt feature level height higher than the
Two features.Fisrt feature second feature " under ", " lower section " and " below " include that fisrt feature is special second
Levy underface and obliquely downward, or be merely representative of fisrt feature level height less than second feature.
Below with reference to Fig. 1-Fig. 4, micro air pump 100 according to embodiments of the present invention is described.According to embodiments of the present invention miniature
Air pump 100 can be applied and regulate in seat at medical device (such as electric sphygmomanometer) and automobile, but the present invention does not limit
In this.
Shown in Fig. 1 and Fig. 3, micro air pump 100 according to embodiments of the present invention can include the pump housing 10, base assembly
20 and piston diaphragm 30, air-intake valve plate 40 and valve block 50 of giving vent to anger.Shown in Fig. 2 and Fig. 3, the pump housing 10 includes upper cover
11 and valve seat 12, valve seat 12 is located at below upper cover 11, valve seat 12 is provided with outlet passageway 13, and valve block 50 of giving vent to anger sets
Put at outlet passageway 13, be formed with discharge chamber 14 between upper cover 11 and valve seat 13, upper cover 11 is provided with and discharge chamber
The exhaustor 15 of 14 connections.Specifically, valve block 50 of giving vent to anger can be resiliently arranged at outlet passageway 13 so that gas can
To flow into discharge chamber 14 from bottom to top, the gas entering discharge chamber 14 is exported in aerating device by exhaustor 15.
Specifically, shown in Fig. 1 and Fig. 3, upper cover 11 can be tubular, and upper cover 11 is towards the side of valve seat 12
Opening wide, upper cover 11 may include that lid body 111 and annular perisporium 112, and annular perisporium 112 is arranged on lid body 111
And extend towards valve seat 12, discharge chamber 14 is limited by the annular internal face of perisporium 112 and the lower surface of lid body 111.
Shown in Fig. 1 and Fig. 3, upper cover 11 opens wide downward (lower section that valve seat 12 is positioned at upper cover 11), and is connected to lid
Annular perisporium 112 on body 111 downwardly extends, such that it is able to jointly limit discharge chamber 14 with lid body 111.
Base assembly 20 is located at below valve seat 12, is formed with air storing cavity 21 in base assembly 20, and air storing cavity 21 is by arranging
Air intake structure 22 on base assembly 20 connects outside base assembly 20.It is to say, gas can be by being arranged on the end
Air intake structure 22 on holder assembly 20 enters air storing cavity 21.Alternatively, air intake structure 22 can be air inlet post, but does not limits
In this.
Shown in Fig. 2 and Fig. 3, piston diaphragm 30 is located at below valve seat 12, and piston diaphragm 30 is positioned at base assembly
20 is internal, piston diaphragm 30 is formed multiple be downwardly concaved add deep 31, limit plunger shaft 32 in adding deep 31,
Being provided with the inlet channel 16 for connecting plunger shaft 32 and air storing cavity 21 on piston diaphragm 30, air-intake valve plate 40 is arranged on
At inlet channel 16.Specifically, air-intake valve plate 40 can be resiliently arranged at inlet channel 16 so that gas is from gas storage
Chamber 21 is to plunger shaft 32 one-way flow.Alternatively, air-intake valve plate 40 can be structure as a whole with piston diaphragm 30, but not
It is limited to this.
It should be noted that as it is shown in figure 1, piston diaphragm 30 is provided with and multiple adds deep 31, such that it is able to form multiple work
Plug chamber 32, correspondingly, piston diaphragm 30 is provided with multiple inlet channel 16, all can be provided with at multiple inlet channels 16 into
Air valve plate 40, and multiple inlet channel 16 is arranged with multiple plunger shaft 32 one_to_one corresponding.
It addition, be formed with multiple plunger shaft 32 on piston diaphragm 30, it is arranged on the valve block 50 of giving vent to anger at outlet passageway 13 permissible
Make gas from plunger shaft 32 to discharge chamber 14 one-way flow.Correspondingly, valve seat 12 is provided with multiple outlet passageway 13,
All can be provided with valve block 50 of giving vent to anger at multiple outlet passageways 13, and multiple outlet passageway 13 is with multiple plunger shaft 32 one by one
Corresponding.
The volume of discharge chamber 14 is V, and volume V meets relational expression: 4cc≤V≤10cc.It is understood that volume V exists
Discharge chamber 14 in the range of 4cc≤V≤10cc is so that the gas flowing in micro air pump 100 steadily and links up.Letter speech
It, the pressure fluctuation of micro air pump 100 according to embodiments of the present invention is less.
Alternatively, as shown in figures 1 and 3, micro air pump 100 can also include driving means 60, and driving means 60 is permissible
Including motor, when motor works, piston diaphragm 30 can be driven to carry out Repeated Compression and process of expansion for motor so that piston
Chamber 32 carries out aerofluxus repeatedly and breathing process.
Micro air pump 100 according to embodiments of the present invention, the gas flowing in micro air pump 100 steadily and links up, micro air pump
The pressure fluctuation of 100 is less, thus micro air pump 100 goes for the device (example stricter to gas flow stability
Such as electric sphygmomanometer) in, improve the versatility of micro air pump 100 further.
In some examples of the present invention, volume V can meet relational expression: 4cc≤V≤7cc further.It is understood that
There is the discharge chamber 14 of the volume V meeting relational expression 4cc≤V≤7c so that the gas flowing in micro air pump 100 is flat
Steady and coherent, and the pressure fluctuation of micro air pump 100 reduces further.
In other examples of the present invention, volume V can meet relational expression: 5.5cc≤V≤6.5cc further.Can manage
Solve, there is the discharge chamber 14 of the volume V meeting relational expression 5.5cc≤V≤6.5cc so that in micro air pump 100
Gas flowing steadily and coherent, and the pressure fluctuation of micro air pump 100 reduces further, it might even be possible to ignore.
Alternatively, as it is shown on figure 3, a length of L of exhaustor 15, length L can meet relational expression: 10mm≤L≤20mm.
Relational expression is met: the exhaustor 15 of length L of 10mm≤L≤20mm is so that micro air pump it is understood that have
The gas flowing of 100 steadily and links up, and the pressure fluctuation of micro air pump 100 reduces further.Preferably, aerofluxus
Length L of pipe 15 can be 17mm.
Alternatively, as shown in Figure 4, at least one of cross-sectional area of the cavity 153 in exhaustor 15 is S, cross section
Long-pending S can meet relational expression: π (0.3/2)2mm2≤S≤π(0.7/2)2mm2.Cross-sectional area refers to be perpendicular to aerofluxus
The area of the cross section that the internal perisporium of the exhaustor 15 of the length direction (i.e. above-below direction shown in Fig. 3) of pipe 15 is formed.
Have and meet relational expression: π (0.3/2)2mm2≤S≤π(0.7/2)2mm2The exhaustor 15 of cross-sectional area S can make
The gas flowing obtaining micro air pump 100 steadily and links up, and the pressure fluctuation of micro air pump 100 reduces further.Change
Yan Zhi, the cross-sectional area S of the cavity 153 of exhaustor 15 can be satisfied by relational expression: π (0.3/2)2mm2≤S≤π(0.7/2)2mm2, or the cross-sectional area S of the cavity 153 of exhaustor 15 can also partly meet above-mentioned relation formula, and remainder is more than
The upper limit of above-mentioned relation formula or the lower limit less than above-mentioned relation formula.When the cross-sectional area of the cavity 153 of exhaustor 15 occurs once
When more than suddenling change, so that the noise that air-flow produces is cancelled out each other on the cross-sectional area of sudden change, thus play the mesh of noise reduction
's.Preferably, the cross-sectional area of exhaustor 15 is S, cross-sectional area S can meet relational expression: π (0.3/2)2mm2
≤S≤π(0.7/2)2mm2。
Alternatively, as shown in Figure 4, at least one of cross-sectional area of the cavity 153 in exhaustor 15 is S, cross section
Long-pending S can meet relational expression: π (0.3/2)2mm2≤S≤π(1/2)2mm2.Have and meet relational expression: π (0.3/2)2mm2≤S≤π(1/2)2mm2Cross-sectional area S exhaustor 15 so that the gas flowing of micro air pump 100 steadily and
Coherent, and the pressure fluctuation of micro air pump 100 reduces further.In other words, the cavity 153 of exhaustor 15 is transversal
Area S can be satisfied by relational expression: π (0.3/2)2mm2≤S≤π(1/2)2mm2, or the cavity 153 of exhaustor 15
Cross-sectional area S can also partly meet above-mentioned relation formula, remainder is more than the upper limit of above-mentioned relation formula or less than above-mentioned pass
It it is the lower limit of formula.When the cross-sectional area of the cavity 153 of exhaustor 15 occurs to suddenly change more than once, so that air-flow produces
Noise cancel out each other on the cross-sectional area of sudden change, thus play the purpose of noise reduction.Preferably, the cross section of exhaustor 15
Amass and can meet relational expression: π (0.3/2) for S, cross-sectional area S2mm2≤S≤π(1/2)2mm2。
Alternatively, exhaustor 15 can be revolving body, exhaustor 15 Stability Analysis of Structures of revolving body, and by exhaustor 15
Gas flow uniform.Alternatively, the internal face of exhaustor 15 can be uiform section structure, so that exhaustor
15 simple in construction, reduce cost.Alternatively, as it is shown on figure 3, the lower end of exhaustor 15 can downwardly extend beyond aerofluxus
The inner top surface in chamber 14.The exhaustor 15 downwardly extended can increase the length of exhaustor 15, so that through aerofluxus
Steadily, the level of noise making gas flow further is stable in the gas flowing of pipe 15.Alternatively, exhaustor 15 and upper cover
11 can be structure as a whole, and the exhaustor 15 of integrative-structure and the overall structure of upper cover 11 are preferable, and can reduce group
Dress exhaustor 15 and the process of upper cover 11, reduce the production difficulty of micro air pump 100.
Alternatively, as it is shown on figure 3, exhaustor 15 can include upper portion 151 and hypomere part 152, upper portion 151
Being arranged on the upper surface of upper cover 11, hypomere part 152 entirety is accommodated in discharge chamber 14, and hypomere part 152
Outside dimension is less than the outside dimension of upper portion 151.It is to say, the exhaustor being arranged in discharge chamber 14 15 times
The small volume of section part 152, such that it is able to increase discharge chamber 14 to accommodate the volume of gas, further so that miniature
Steadily it links up in the gas flowing of air pump 100, and the pressure fluctuation of micro air pump 100 reduces.
Below with reference to the accompanying drawings the gas flow in micro air pump 100 according to embodiments of the present invention is described in detail.
When driving means 60 works, driving means 60 drives piston diaphragm 30 to carry out Repeated Compression and process of expansion.Work as work
When plug diaphragm 30 is in process of expansion, micro air pump 100 carries out breathing process, and gas enters into storage by air intake structure 22
In air cavity 21, the gas being positioned at air storing cavity 21 enters plunger shaft 32, now micro air pump 100 by inlet channel 16
Complete breathing process.In the process, the gas pressure in air storing cavity 21 reaches certain value, i.e. promotes at air-intake valve plate 40
In the force value of open mode, gas enters plunger shaft 32 by inlet channel 16.
When piston diaphragm 30 is in contraction process, micro air pump 100 is exhausted process, the gas quilt in plunger shaft 32
Extruding flows up, and gas enters into discharge chamber 14 by outlet passageway 13, and the gas in discharge chamber 14 passes through exhaustor 15
Discharging micro air pump 100, now micro air pump 100 completes exhaust process.In the process, the gas of plunger shaft 32 it is positioned at
Body pressure reaches certain value, and the valve block 50 that i.e. promotes to give vent to anger is in the force value of open mode, and gas is entered by outlet passageway 13
Enter to discharge chamber 14.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
Example " or the description of " some examples " etc. means to combine this embodiment or example describes specific features, structure, material or
Feature is contained at least one embodiment or the example of the present invention.In this manual, the schematic representation to above-mentioned term
Necessarily it is directed to identical embodiment or example.And, the specific features of description, structure, material or feature are permissible
Any one or more embodiments or example combine in an appropriate manner.Additionally, those skilled in the art can be by
Different embodiments or example described in this specification engage and combine.
Although above it has been shown and described that embodiments of the invention, it is to be understood that above-described embodiment is exemplary,
Being not considered as limiting the invention, those of ordinary skill in the art within the scope of the invention can be to above-described embodiment
It is changed, revises, replaces and modification.
Claims (12)
1. a micro air pump, it is characterised in that including:
The pump housing, the described pump housing includes that upper cover and valve seat, described valve seat are located at below described upper cover, described valve seat is provided with out
Gas passage, be formed with discharge chamber between described upper cover and described valve seat, described on cover to be provided with and connect with described discharge chamber
Exhaustor；
Base assembly, described base assembly is located at below described valve seat, is formed with air storing cavity, described storage in described base assembly
Air cavity is connected outside base assembly by the air intake structure being arranged on described base assembly；
Piston diaphragm, described piston diaphragm is located at below described valve seat and is positioned at inside described base assembly, described piston diaphragm
On be formed multiple be downwardly concaved add deep, described in add deep in limit plunger shaft, described piston diaphragm is provided with use
In connecting described plunger shaft and the inlet channel of air storing cavity；
Air-intake valve plate and give vent to anger valve block, described air-intake valve plate be arranged at described inlet channel and described in valve block of giving vent to anger be arranged on institute
State at outlet passageway；
Wherein, the volume of described discharge chamber is V, and described volume V meets relational expression: 4cc≤V≤10cc.
Micro air pump the most according to claim 1, it is characterised in that described volume V meets relational expression: 4cc further
≤V≤7cc。
Micro air pump the most according to claim 1, it is characterised in that described volume V meets relational expression: 5.5cc further
≤V≤6.5cc。
Micro air pump the most according to claim 1, it is characterised in that a length of L of described exhaustor, described length
L meets relational expression: 10mm≤L≤20mm.
Micro air pump the most according to claim 1, it is characterised in that the cavity in described exhaustor at least some of
Cross-sectional area be S, described cross-sectional area S meets relational expression: π (0.3/2)2mm2≤S≤π(0.7/2)2mm2。
Micro air pump the most according to claim 1, it is characterised in that the cavity in described exhaustor at least some of
Cross-sectional area be S, described cross-sectional area S meets relational expression: π (0.3/2)2mm2≤S≤π(1/2)2mm2。
Micro air pump the most according to claim 1, it is characterised in that described exhaustor is revolving body.
Micro air pump the most according to claim 1, it is characterised in that the internal face of described exhaustor is uiform section structure.
Micro air pump the most according to claim 1, it is characterised in that the lower end of described exhaustor downwardly extends beyond institute
State the inner top surface of discharge chamber.
Micro air pump the most according to claim 1, it is characterised in that described exhaustor and the integral knot of described upper cover
Structure.
11. micro air pumps according to claim 1, it is characterised in that described exhaustor includes upper portion and hypomere
Part, described upper portion is arranged on the upper surface of described upper cover, and described hypomere part entirety is accommodated in described discharge chamber,
And the outside dimension of described hypomere part is less than the outside dimension of described upper portion.
12. micro air pumps according to claim 1, it is characterised in that described upper cover is tubular and towards described valve seat
Side open wide, described upper cover includes: lid body and annular perisporium, described annular perisporium be arranged on described lid body and court
Extending to described valve seat, described discharge chamber is limited by the described annular internal face of perisporium and the lower surface of described lid body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510160199.9A CN106150987A (en) | 2015-04-07 | 2015-04-07 | Micro air pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510160199.9A CN106150987A (en) | 2015-04-07 | 2015-04-07 | Micro air pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106150987A true CN106150987A (en) | 2016-11-23 |
Family
ID=57337639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510160199.9A Pending CN106150987A (en) | 2015-04-07 | 2015-04-07 | Micro air pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106150987A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108626095A (en) * | 2017-03-17 | 2018-10-09 | 百略医学科技股份有限公司 | The air pump of air-flow noise and noise can be reduced |
| CN110030180A (en) * | 2019-04-30 | 2019-07-19 | 东莞市康助医疗科技有限公司 | A kind of air pump and electronic sphygmomanometer |
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| CN108626095A (en) * | 2017-03-17 | 2018-10-09 | 百略医学科技股份有限公司 | The air pump of air-flow noise and noise can be reduced |
| CN110030180A (en) * | 2019-04-30 | 2019-07-19 | 东莞市康助医疗科技有限公司 | A kind of air pump and electronic sphygmomanometer |
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Application publication date: 20161123 |
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