CN106065964A - A kind of check (non-return) valve - Google Patents
A kind of check (non-return) valve Download PDFInfo
- Publication number
- CN106065964A CN106065964A CN201610593948.1A CN201610593948A CN106065964A CN 106065964 A CN106065964 A CN 106065964A CN 201610593948 A CN201610593948 A CN 201610593948A CN 106065964 A CN106065964 A CN 106065964A
- Authority
- CN
- China
- Prior art keywords
- valve block
- cover body
- valve
- check
- return
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/18—Check valves with actuating mechanism; Combined check valves and actuated valves
- F16K15/182—Check valves with actuating mechanism; Combined check valves and actuated valves with actuating mechanism
- F16K15/1821—Check valves with actuating mechanism; Combined check valves and actuated valves with actuating mechanism for check valves with a hinged or pivoted closure member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/03—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member
- F16K15/033—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member spring-loaded
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Multiple-Way Valves (AREA)
- Mechanically-Actuated Valves (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Abstract
The invention discloses a kind of check (non-return) valve, including cover body and the valve block being located in cover body and can rotate relative to cover body, described cover body is provided with the drive mechanism for driving valve block to rotate, it is characterized in that: be provided with installation cavity in the inside of described cover body, described drive mechanism is arranged in described installation cavity, and described drive mechanism includes and stretches out in described installation cavity the drive rod for driving valve block to rotate.It is an advantage of the current invention that: this check (non-return) valve is provided with installation cavity by the inside at cover body, it is used for driving the drive mechanism of valve block to hide to be located in installation cavity, not only make cover body internal structure more succinct, and interference and the interference to drive mechanism during without considering that sealing between drive mechanism and cover body and smoke pipe are fixed, in addition, drive mechanism is not easy to by the fume pollution in flue.
Description
Technical field
The present invention relates to a kind of check (non-return) valve.
Background technology
In the kitchen using longitudinally public gas flue, in order to prevent the oil smoke in gas flue from blowing back in kitchen, taking out
Giving vent to anger of lampblack absorber is both provided with device as check valve for flue between the mouth of pipe and public gas flue.Existing flue is non-return
Valve generally comprises the oil smoke passage being made up of shell, and this oil smoke passage has relative air inlet and air outlet, and air inlet connects
Connecing the mouth of pipe of giving vent to anger of smoke exhaust ventilator, air outlet extend in public gas flue, is provided with able to turn on or off at oil smoke passage air outlet
Valve block, valve block is arranged on the inwall of oil smoke passage by horizontally disposed valve block axis of rotation.When not using lampblack absorber,
Valve block is in the closed position due to self gravitation, and valve block covers at air-out oral area；When using lampblack absorber, valve block is in opens position
Putting, valve block is away from air outlet.Due to the public gas flue of the public longitudinal direction of many users, once single household's breaking out of fire, greatly
The high-temperature harmful gas of amount pours in longitudinal public gas flue, if now closing the valve block in check valve for flue not in time, this
A little substantial amounts of high-temperature harmful gas can be entered in the user family being currently in use lampblack absorber by the oil smoke passage of check valve for flue, from
And threaten the life security of resident family.
Existing check (non-return) valve generally comprises valve body and the retaining board being arranged on valve body, and valve body has body cavity, valve
Body entrance and valve outlet, body cavity connection valve body inlet and valve outlet, drive retaining board relative to valve by drive mechanism
Body rotates.Chinese utility model patent institute such as Patent No. ZL 02263410.X (Authorization Notice No. is CN 2557819 Y)
Disclosed " check valve for flue ", there is the sidepiece being perpendicular to horizontal plane direction the left and right sides at valve outlet for this check valve for flue
Deflector, the bottom of retaining board is pivotally connected with valve body or sidepiece deflector, and meanwhile, retaining board is connected with driving means
Connect, drive retaining board to open and close by driving means.Such as Application No. 201410788893.0, (application publication number is CN
104482256 A) " a kind of intelligent electric check (non-return) valve " disclosed in Chinese invention patent application, the non-return valve block of this check (non-return) valve
Fixing pin by bearing pin to be arranged on bearing pin, intelligent controller is connected with bearing pin by shaft joint, is used for controlling non-return valve block
Rotate.The driving means of above-mentioned existing check (non-return) valve is all located at outside valve body, needs to consider between driving means and cover body during installation
Interference and interference to drive mechanism when sealing and smoke pipe are fixed, the mounting structure of driving means is not reasonable.
Content of the invention
The technical problem to be solved is for above-mentioned prior art present situation, provides the installation of a kind of drive mechanism
Check (non-return) valve relatively reasonable in structure.
The technical scheme that the present invention solves that above-mentioned technical problem used is: this check (non-return) valve includes cover body and is located in cover body
And the valve block that can rotate relative to cover body, described cover body is provided with the drive mechanism for driving valve block to rotate, its feature exists
In: be provided with installation cavity in the inside of described cover body, described drive mechanism is arranged in described installation cavity, described drive mechanism
Include and stretch out in described installation cavity the drive rod for driving described valve block to rotate.
Preferably, the inside at described cover body is provided with dividing plate, forms described installation between described dividing plate and faceshield side wall
Chamber, described installation cavity forms opening in the bottom of cover body, and described valve block is located at the top of described installation cavity, and described drive rod is upwards
Stretch out in described installation cavity.
As a kind of preferred version of drive mechanism, described drive mechanism includes electromagnet, iron core, permanent magnet and bullet
Spring, described electromagnet sleeve is located at outside described iron core, and described permanent magnet is fixed on described iron core upper end and is positioned at described electricity
The top of magnet, the bottom of described iron core is provided with radially boss, and described spring is arranged on the bottom of described iron core, under spring
End offsets with described radial direction boss, and the upper end of spring offsets with the bottom surface of electromagnet, described drive rod and described iron core or
Permanent magnet is fixing to be connected.
As the another kind of preferred version of drive mechanism, described drive mechanism uses wax motor or linear electric motors, described
Drive rod is arranged on the output of described wax motor or linear electric motors.
Preferably, between the relative inner wall of described cover body, rotary shaft rack is installed, described rotary shaft rack is provided with
Rotating shaft, is provided with the valve block described in two panels in described rotating shaft, and two panels valve block is symmetricly set on the both sides of described rotating shaft.This
Sample, this check (non-return) valve is double valve sheet check (non-return) valve.
Further preferably, the lower section at described valve block is provided with connecting rod, and described connecting rod includes arc body, kink and pin
Axle portion, described kink takes shape in the two ends of arc body and for offseting with described valve block, and described bearing pin portion takes shape in curved
The outside of folding part is simultaneously rotatably arranged on described cover body, and the drive rod of described drive mechanism is connected to described arc body
Centre.
Preferably, between the relative inner wall of described cover body, connecting shaft is installed, described connecting shaft is provided with one
Valve block described in piece, and the centre position of the connecting shaft described valve block of skew, the point of application on valve block for the described drive rod be positioned at
The farthest valve block edge of connecting shaft vertical range.So, this check (non-return) valve is single valve piece check (non-return) valve, and permissible when valve block is opened
Obtaining bigger moment of torsion, it is more easy to open.
Further preferably, described valve block is inclined relative to horizontal setting, at described valve block towards air outlet direction
Having a circle on the side of side along the circumferentially distributed oil guide groove of valve block, its lowest position in described oil guide groove has leakage of oil
Mouthful.Valve block uses after said structure, on the one hand can play the structure strengthening valve block to prevent valve block from deforming, on the other hand permissible
It is prevented effectively from greasy dirt to accumulate on valve block.
Preferred as any of the above-described scheme, the air-out port at described cover body is provided with air outlet clamping ring, described go out
The bore of air port clamping ring is gradually reduced to top from bottom.After using said structure, on the basis of not affecting smoke pipe installation
The sealing with air outlet clamping ring bottom smoke pipe can be improved.
Further preferably, described valve block is located at the inside of described air outlet clamping ring, and the outer rim of described valve block and air-out
Gap is left between the inwall of mouth clamping ring.This way it is possible to avoid greasy dirt along air outlet clamping ring inwall reach valve block and
The junction of cover body.
Compared with prior art, it is an advantage of the current invention that: this check (non-return) valve, by being provided with installation cavity in the inside of cover body, is used
The drive mechanism driving valve block can be hidden and is located in installation cavity, not only makes cover body internal structure more succinct, and without examining
Interference and interference to drive mechanism when sealing between worry drive mechanism and cover body and smoke pipe are fixed, in addition, drive mechanism
It is not easy to by the fume pollution in flue.
Brief description
Fig. 1 is the structural representation of the embodiment of the present invention one；
Fig. 2 is the structural representation of another angle of the embodiment of the present invention one；
Fig. 3 is that the A-A of check (non-return) valve shown in Fig. 1 is to sectional view；
Fig. 4 is the structural representation (removing valve block) of the embodiment of the present invention one；
Fig. 5 is the structural representation of the drive rod of the embodiment of the present invention one.
Fig. 6 is the sectional view of the embodiment of the present invention two；
Fig. 7 is the drive mechanism structural representation in an initial condition of the embodiment of the present invention two；
Fig. 8 is the drive mechanism structural representation in the energized state of the embodiment of the present invention two；
Fig. 9 is the structural representation of the embodiment of the present invention three；
Figure 10 is that the B-B of check (non-return) valve shown in Fig. 9 is to sectional view.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Embodiment one:
As shown in Figures 1 to 5, the check (non-return) valve in the present embodiment includes cover body 1 and two valve blocks 2, sets in the inside of cover body 1
Having installation cavity 3, being provided with drive mechanism in installation cavity 3, drive mechanism has drive rod 10.Specifically, the inside at cover body 1
Being provided with angularly disposed dividing plate 11, forming installation cavity 3 between dividing plate 11 and cover body 1 sidewall, installation cavity 3 is in the bottom shape of cover body 1
Becoming opening, valve block 2 is located at the top of installation cavity 3, and drive rod 10 protrudes upward in installation cavity 3 and for driving valve block 2 to rotate.This
In embodiment, drive mechanism uses wax motor 40, and drive rod 10 is arranged on the output of wax motor 40.Certainly, drive mechanism is also
Other type of drive such as linear electric motors can be used.
In the present embodiment, valve block 2 has two panels, is provided with rotary shaft rack 5, in rotating shaft between the relative inner wall of cover body 1
Being provided with rotating shaft 6 on support 5, two panels valve block 2 is arranged in rotating shaft 6 and phase countershaft is symmetrical arranged.It is provided with in the lower section of valve block 2
It is used for connecting the connecting rod 7 of drive rod 10 and valve block 2.This connecting rod 7 includes arc body the 71st, kink 72 and bearing pin portion 73, curved
Folding part 72 takes shape in the two ends of arc body 71 and for offseting with valve block 2, and bearing pin portion 73 takes shape in the outside of kink 72,
Respectively have an installing hole in the both sides within cover body 1, bearing pin portion 73 is arranged in the installing hole of respective side, so that connecting rod 7
Can rotate relative to cover body 1.
The drive rod 10 of drive mechanism protrudes upward in installation cavity 3 centre being connected to arc body 71.Wax motor
During 40 startup, drive drive rod 7 to rotate in the range of certain angle, make two kinks 72 of drive rod 7 simultaneously to two valves
Piece 2 increases thrust, so that two valve blocks 2 can synchronize to open, after wax motor 40 cuts out, two valve blocks 2 can rely on the weight of self
Power close synchronously.
In order to improve the sealing with air outlet clamping ring bottom smoke pipe on the basis of not affecting smoke pipe installation, this is non-return
Valve is provided with air outlet clamping ring 9 at the air-out port of cover body 1, and the bore of air outlet clamping ring 9 is from bottom to top gradually
Reduce.In addition, valve block 2 is located at the inside of air outlet clamping ring 9, in order to avoid greasy dirt reaches along the inwall of air outlet clamping ring
Valve block 2 and the junction of cover body 1, leave gap between the outer rim of valve block 2 and the inwall of air outlet clamping ring 9.
In addition, pass through programme-control, drive mechanism can be designed to range hood synchronous averaging, and over time
Close, it is also possible to by the method for counting, make drive mechanism start to start after valve block closes 2000～3000 times.
Embodiment two:
As shown in Figure 6 to 8, the check (non-return) valve in the present embodiment also has two valve blocks 2, the difference with embodiment one
It is that drive mechanism differs.In the present embodiment, the 42nd, drive mechanism, in addition to drive rod 10, also includes electromagnet the 41st, iron core
Permanent magnet 43 and spring 44.Wherein, electromagnet 41 is set in outside iron core 42, and permanent magnet 43 is fixed on iron core 42 upper end and is positioned at
The top of electromagnet 41, the bottom of iron core 42 is provided with radially boss 45, and spring 44 is arranged on bottom and the spring 44 of iron core 42
Lower end offset with radially boss 45, the upper end of spring 44 offsets with the bottom surface of electromagnet 41, drive rod 10 and iron core 42 or
Permanent magnet 43 is fixing to be connected.
Electromagnet 41 and permanent magnet 43 initial distance are the smaller the better, preferably 0-5mm.Electromagnet 41 and permanent magnet 43 adjacent surface
It is plane, and area approximation, with permanent magnet 43 opposite polarity after electromagnet 41 energising.As it is shown in fig. 7, under original state, electricity
Magnet 41 is mutually close with permanent magnet 43.As shown in Figure 8, after energising under state, maximum between electromagnet 41 and permanent magnet 43, is produced
Repulsive force, iron core 42 and permanent magnet 43 move up under repulsion effect, drives drive rod 10 to move up simultaneously, and then band
Moving valve plate 2 is opened.
Embodiment three:
As shown in Figure 9 and Figure 10, the check (non-return) valve in the present embodiment has a valve block 2.Cover body 1 relative inner wall it
Between connecting shaft 8 is installed, valve block 2 is arranged in connecting shaft 8, and connecting shaft 8 offsets the centre position of valve block 2.Drive mechanism can
To use the drive mechanism in embodiment one and embodiment two, point of application position on valve block 2 for the drive rod 10 of this drive mechanism
In the valve block edge farthest with connecting shaft 8 vertical range so that bigger moment of torsion can be obtained when valve block 2 is opened, open
More easy.
Valve block 2 in the present embodiment is inclined relative to horizontal setting, and gradient is typically provided to less than 30 °.At valve block 2
Have a circle along the circumferentially distributed oil guide groove 21 of valve block on the side of air outlet direction side, minimum in oil guide groove 21
Position has oil leakaging port 22.The effect strengthening valve structure can be played in valve block 2 surface configuration oil guide groove 21, in addition, by
It is obliquely installed in oil guide groove 21, oil can be made to flow down along oil guide groove 21, and flowed out by oil leakaging port 22, thus be prevented effectively from
Greasy dirt is accumulated on valve block.
Claims (10)
1. a check (non-return) valve, including cover body (1) and the valve block (2) being located in cover body and can rotate relative to cover body, at described cover body
(1) drive mechanism for driving valve block (2) to rotate is installed on, it is characterised in that: it is provided with peace in the inside of described cover body (1)
Behaveing affectedly (3), described drive mechanism is arranged in described installation cavity (3), and described drive mechanism includes and stretches out in described peace
It behave affectedly (3) and be used for the drive rod (10) driving described valve block (2) to rotate.
2. check (non-return) valve according to claim 1, it is characterised in that: it is provided with dividing plate (11), institute in the inside of described cover body (1)
Stating and forming described installation cavity (3) between dividing plate (11) and faceshield side wall, described installation cavity (3) is formed in the bottom of cover body (1)
Opening, described valve block (2) is located at the top of described installation cavity (3), and described drive rod protrudes upward in described installation cavity (3).
3. check (non-return) valve according to claim 1, it is characterised in that: described drive mechanism includes electromagnet (41), iron core
(42), permanent magnet (43) and spring (44), described electromagnet (41) is set in described iron core (42) outward, described permanent magnet (43)
Being fixed on described iron core (42) upper end the top being positioned at described electromagnet (41), the bottom of described iron core (42) is provided with footpath
To boss (45), described spring (44) is arranged on the bottom of described iron core (42), the lower end of spring (44) and described radial convex
Platform (45) offsets, and the upper end of spring (44) offsets with the bottom surface of electromagnet (41), described drive rod (10) and described iron core
Or permanent magnet (43) is fixing connects (42).
4. check (non-return) valve according to claim 1, it is characterised in that: described drive mechanism uses wax motor (40) or straight line
Motor, described drive rod (10) is arranged on the output of described wax motor (40) or linear electric motors.
5. the check (non-return) valve with double valve sheet according to claim 1, it is characterised in that: mutually internal at described cover body (1)
Rotary shaft rack (5) is installed between sidewall, described rotary shaft rack (5) is provided with rotating shaft (6), in the upper peace of described rotating shaft (6)
Equipped with the valve block (2) described in two panels, and two panels valve block (2) is symmetricly set on the both sides of described rotating shaft (6).
6. check (non-return) valve according to claim 5, it is characterised in that: it is provided with connecting rod (7), institute in the lower section of described valve block (2)
Stating connecting rod and including arc body (71), kink (72) and bearing pin portion (73), described kink (72) takes shape in arc body
The two ends in portion (71) simultaneously are used for offseting with described valve block (2), described bearing pin portion (73) take shape in kink (72) outside and turn
Being arranged on described cover body (1), the drive rod (10) of described drive mechanism is connected to described arc body (71) dynamicly
Middle.
7. check (non-return) valve according to claim 1, it is characterised in that: install between the relative inner wall of described cover body (1)
There is connecting shaft (8), described connecting shaft (8) is provided with a piece of described valve block (2), and connecting shaft (8) offsets described valve block
(2) centre position, the point of application on valve block (2) for the described drive rod (10) is positioned at farthest with connecting shaft (8) vertical range
Valve block edge.
8. check (non-return) valve according to claim 7, it is characterised in that: described valve block (2) is inclined relative to horizontal setting,
Having a circle at described valve block (2) along the circumferentially distributed oil guide groove of valve block on the side of air outlet direction side
(21), its lowest position in described oil guide groove (21) has oil leakaging port (22).
9. the check (non-return) valve according to any claim in claim 1 to 8, it is characterised in that: in going out of described cover body (1)
Wind port is provided with air outlet clamping ring (9), and the bore of described air outlet clamping ring (9) is gradually reduced to top from bottom.
10. check (non-return) valve according to claim 9, it is characterised in that: described valve block (2) is located at described air outlet clamping ring
(9) gap is left between inside, and the outer rim of described valve block (2) and the inwall of air outlet clamping ring (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610593948.1A CN106065964B (en) | 2016-07-22 | 2016-07-22 | A kind of check (non-return) valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610593948.1A CN106065964B (en) | 2016-07-22 | 2016-07-22 | A kind of check (non-return) valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106065964A true CN106065964A (en) | 2016-11-02 |
| CN106065964B CN106065964B (en) | 2019-04-30 |
Family
ID=57207166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610593948.1A Active CN106065964B (en) | 2016-07-22 | 2016-07-22 | A kind of check (non-return) valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106065964B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107631034A (en) * | 2017-09-27 | 2018-01-26 | 火星人厨具股份有限公司 | A kind of assisting in opening mechanism of flute check valve |
| CN109707880A (en) * | 2017-10-26 | 2019-05-03 | 东莞前沿技术研究院 | Check-valves and aerostatics |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2263245Y (en) * | 1996-07-26 | 1997-09-24 | 南海市南桂家用电器工业公司 | Check valve for kitchen ventilator |
| KR20090069112A (en) * | 2007-12-24 | 2009-06-29 | 주식회사 코펙스 | The cyclone valve for controlling high-temperature differential steel gas |
| CN201363461Y (en) * | 2009-03-23 | 2009-12-16 | 何岱东 | Electromagnetic flue check valve |
| CN104266205A (en) * | 2014-08-25 | 2015-01-07 | 许高歌 | Check sealing structure for smoke exhaust equipment |
| CN204477397U (en) * | 2015-01-20 | 2015-07-15 | 刘孟华 | The smoke back proof check valve device of plug-in type band tension location |
| CN205978670U (en) * | 2016-07-22 | 2017-02-22 | 宁波方太厨具有限公司 | Check valve |
-
2016
- 2016-07-22 CN CN201610593948.1A patent/CN106065964B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2263245Y (en) * | 1996-07-26 | 1997-09-24 | 南海市南桂家用电器工业公司 | Check valve for kitchen ventilator |
| KR20090069112A (en) * | 2007-12-24 | 2009-06-29 | 주식회사 코펙스 | The cyclone valve for controlling high-temperature differential steel gas |
| CN201363461Y (en) * | 2009-03-23 | 2009-12-16 | 何岱东 | Electromagnetic flue check valve |
| CN104266205A (en) * | 2014-08-25 | 2015-01-07 | 许高歌 | Check sealing structure for smoke exhaust equipment |
| CN204477397U (en) * | 2015-01-20 | 2015-07-15 | 刘孟华 | The smoke back proof check valve device of plug-in type band tension location |
| CN205978670U (en) * | 2016-07-22 | 2017-02-22 | 宁波方太厨具有限公司 | Check valve |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107631034A (en) * | 2017-09-27 | 2018-01-26 | 火星人厨具股份有限公司 | A kind of assisting in opening mechanism of flute check valve |
| CN107631034B (en) * | 2017-09-27 | 2024-05-17 | 火星人厨具股份有限公司 | Auxiliary opening mechanism of flue check valve |
| CN109707880A (en) * | 2017-10-26 | 2019-05-03 | 东莞前沿技术研究院 | Check-valves and aerostatics |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106065964B (en) | 2019-04-30 |
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