CN104964074B - The electronic device and its manufacturing method of vent valve and the application vent valve - Google Patents
The electronic device and its manufacturing method of vent valve and the application vent valve Download PDFInfo
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- CN104964074B CN104964074B CN201510122181.XA CN201510122181A CN104964074B CN 104964074 B CN104964074 B CN 104964074B CN 201510122181 A CN201510122181 A CN 201510122181A CN 104964074 B CN104964074 B CN 104964074B
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- pedestal
- vent valve
- elastic membrane
- punching
- closed
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Classifications
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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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/18—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on either side
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Self-Closing Valves And Venting Or Aerating Valves (AREA)
Abstract
The electronic device and its manufacturing method of a kind of vent valve and the application vent valve.Vent valve includes pedestal, elastic membrane and cover.Pedestal has an air duct.Elastic membrane is fixedly arranged in air duct and obstructs air duct.Elastic membrane has one to be closed punching, and being closed punching can be forced by punching both ends draught head is closed and be opened.Cover covers elastic membrane and is fixed with pedestal.In one embodiment, electronic device can reduce inside and outside pressure differential by vent valve.
Description
Technical field
The present invention relates to a kind of vent valve, more particularly to a kind of vent valve with elastic membrane and the electricity using the vent valve
Sub-device and its manufacturing method.
Background technology
Some electronic devices have dust-proof, waterproof demand, therefore need to be by the environment of the pairs of outer closure of interior design.When this
Electron-like is installed on when working in the big environment of difference variation, inside and outside draught head may be because the temperature difference and become larger, and cause
Problem.Solution is the appropriate vent valve of design, it is ensured that the draught head inside and outside electronic device is not excessive.
Invention content
The purpose of the present invention is to provide the electronic devices and its manufacturing method of a kind of vent valve and the application vent valve, can
The inside and outside pressure differential of electronic device is reduced, reduces the negative effect that electronic device is under pressure caused by difference.
According to the present invention it is proposed that a kind of vent valve.Vent valve includes a pedestal, an elastic membrane and a cover.Pedestal has
One air duct.Elastic membrane is fixedly arranged in air duct and obstructs air duct.Elastic membrane has one to be closed punching, is closed punching
It can be forced and opened by punching both ends draught head is closed.Cover covers elastic membrane and is fixed with pedestal.
According to the present invention it is proposed that a kind of electronic device.Electronic device includes vent valve and casing.Casing has an opening.
Vent valve is inserted in the opening of casing.Vent valve includes a pedestal, an elastic membrane and a cover.There is pedestal an air to lead to
Road.Elastic membrane is fixedly arranged in air duct and obstructs air duct.Elastic membrane has one to be closed punching, and being closed punching can be closed
Punching both ends draught head is forced and is opened.Cover covers elastic membrane and is fixed with pedestal
According to the present invention it is proposed that a kind of manufacturing method of vent valve.Manufacturing method includes the following steps.A pedestal is formed,
Wherein pedestal has an air duct；An elastic membrane is formed in pedestal, wherein elastic membrane is fixedly arranged in air duct；And
One is formed in elastic membrane and is closed punching, wherein being closed punching can be forced by punching both ends draught head is closed and be opened.
Below in conjunction with the drawings and specific embodiments, the present invention will be described in detail, but not as a limitation of the invention.
Description of the drawings
Figure 1A is painted the exploded view of the vent valve according to one embodiment of the invention；
Figure 1B is painted the constitutional diagram of the vent valve of Figure 1A；
Fig. 1 C are painted sectional view of the vent valve of Figure 1B along direction 1C-1C '；
Fig. 1 C-1, Fig. 1 C-2 are the partial enlarged view of Fig. 1 C；
Fig. 2 is painted the schematic diagram of the vent valve reduction pressure differential of Fig. 1 C；
Fig. 2-1, Fig. 2-2 are the partial enlarged view of Fig. 2；
Fig. 3 is painted the elastic membrane of Fig. 1 C and the vertical view of closed ring barricade；
Fig. 4 A are painted the exploded view of the vent valve according to another embodiment of the present invention；
Fig. 4 B are painted the constitutional diagram of the vent valve of Fig. 4 A；
Fig. 5 A to Fig. 5 E are painted the process drawing of the vent valve of Figure 1B
Fig. 5 C-1 are the partial enlarged view of Fig. 5 C；
Fig. 5 E-1 are the partial enlarged view of Fig. 5 E.
Specific embodiment
The structural principle and operation principle of the present invention are described in detail below in conjunction with the accompanying drawings：
Figure 1A to Fig. 1 C is please referred to, Figure 1A is painted the exploded view of the vent valve according to one embodiment of the invention, and Figure 1B is painted
The constitutional diagram of the vent valve of Figure 1A, and Fig. 1 C are painted sectional view of the vent valve of Figure 1B along direction 1C-1C ', Fig. 1 C-1, Fig. 1 C-2
Partial enlarged view for Fig. 1 C.
As shown in Fig. 1 C, Fig. 1 C-1, Fig. 1 C-2, vent valve (vent valve) 100 can be inserted in the machine of electronic device 10
Shell 11, the environment that makes electronic device 10 can in a high temperature to change excessive to avoid the inside and outside pressure differential of electronic device 10
Middle work.Electronic device 10 be, for example, network camera, passive infrared sensor (Passive Infrared Sensor,
) or other devices PIR.
As shown in Figure 1A, vent valve 100 includes pedestal 110, cover 120, closely sealed washer (washer) 130, elastic membrane
(elastic membrane) 140 (being illustrated in Fig. 1 C) and closed ring barricade 150 (being illustrated in Fig. 1 C).
As illustrated in figures 1A and ib, pedestal 110 includes the first side 111, and the first side 111 has multiple first trepannings
111a.As shown in Figure 1A, the first trepanning 111a is perforation.Cover 120 includes the second side 121, and the second side 121 has multiple
Second trepanning 121a.As shown in Figure 1A, the second trepanning 121a is perforation.As shown in Figure 1B, when pedestal 110 is combined with cover 120
When, the first trepanning 111a and the second trepanning 121a are at least partly be overlapped.Thus, air can be circulated by aforementioned overlay region.
In one embodiment, the first side 111 can be used ultrasonic combination technology with the second side 121 and permanently fix, so reachable
To tamper effect, and foreign matter is avoided to enter vent valve by the junction between the first side 111 and the second side 121
Inside 100.In another embodiment, the first side 111 and the second side 121 also can temporary combination, such as screw togather or engage.
Although the pedestal 110 and cover 120 of the present embodiment are illustrated by taking circle as an example, the pedestal 110 of right other embodiments
And/or cover 120 can also be polygon, ellipse or other shapes.
In addition, pedestal 110 may include a fixed part for being fixed on electronic device 10.For example, as shown in Figure 1 C, pedestal
110 further include hook (hook) 112 and insertion section 113, and wherein insertion section 113 extends from the lower surface 110b of pedestal 110, and blocks
Hook 112 one end for being formed in insertion section 113.Electronic device 10 further includes stopper section 12.Hook 112 may pass through the opening of casing 11
11a, and the lower surface 12b of stopper section 12 is pressed on, to be sticked in stopper section 12.Thus, vent valve 100 not readily disengages from
Electronic device 10.In another embodiment, hook 112 can be replaced with a male thread, under designing herein, the opening 11a's of casing 11
Inner wall can have box thread, and the wherein male thread can be screwed togather with opening 11a, with fixed ventilation valve 100 and electronic device 10.
As shown in Figure 1 C, closely sealed washer 130 be sheathed on the lower surface 110b of pedestal 110 and pedestal 110 hook 112 it
Between.The casing 11 of electronic device 10 has recess portion 11r.After vent valve 100 is inserted in electronic device 10, closely sealed washer 130 holds
It is placed in recess portion 11r and is compressed between stopper section 12 and the lower surface 110b of pedestal 110, can so avoid electronic device 10
Outer gas, liquid or impurity etc. are entered in electronic device 10.That is, vent valve 100, which not only has, reduces electronics dress
The function of 10 inside and outside pressure differential is put, the technical effect of waterproof and dustproof can be more provided.In one embodiment, closely sealed 130, washer
O-ring made of rubber (O-ring) in this way.
As shown in Figure 1 C, pedestal 110 has air duct 110a.Elastic membrane 140 is fixedly arranged on the air duct in pedestal 110
In 110a and obstruct air duct 110a.In one embodiment, extra quality injection molding can be used, form elastic membrane 140 in pedestal 110
It is interior, elastic membrane 140 is made closely to be incorporated into pedestal 110.Since elastic membrane 140 is closely combined with pedestal 110, outside can be avoided
Gas, liquid or impurity etc. enter the air duct of vent valve 100 by the junction between elastic membrane 140 and pedestal 110
In 110a.
In addition, elastic membrane 140 has multiple closure punching 140a.When the air pressure balance or difference that are closed punching 140a both ends
When little, it is in closed state to be closed punching 140a, and being so closed punching 140a can be forced by punching 140a both ends draught head is closed
And it opens.That is, it is closed the air hole that punching 140a is an alternative closure or openness.
Be closed punching 140a can be used e.g. needling shape into.Since elastic membrane 140 has elasticity, when with needling shape into closing
After the 140a of syzygies hole, it is closed the meeting elastic recovery of the elastic film material around punching 140a and closes and be closed punching 140a.One implements
In example, the material of elastic membrane 140 includes silicide, thermoplastic elastomer (TPE) (Thermoplastic Elastomer, TPE), thermoplastic
Property rubber (Thermo-Plastic-Rubber material, TPR) or thermoplastic polyurethane resin (Thermoplastic
Polyurethane,TPU).With needling shape into the aperture for being closed punching 140a it is very small, after needle is made to detach elastic membrane 140, be closed
Punching 140a is easily closed completely.In one embodiment, the outer diameter for forming the needle for being closed punching 140a can be between 0.01 millimeter to 1.0
Between millimeter.
Such as Fig. 1 C, multiple closed ring barricades 150 are formed in elastic membrane 140, and extend elastic membrane 140 and pedestal
Between 110.Closed ring barricade 150, which is located at, to be closed between punching 140a and the first side 111, can be stopped outside vent valve 100
Gas, liquid or impurity etc. are entered in the circular space of closed ring barricade 150.
Each closed ring barricade 150 includes first end 151 and second end 152, and wherein first end 151 is connected to elastic membrane
140, and second end 152 is compressed by cover 120.It can be inside and outside by closed ring barricade 150 between cover 120 and second end 152
Draught head forces and opens a ventilative seam 150a.When 150 inside and outside air pressure balance of closed ring barricade or when being not much different, breathe freely
150a is stitched to be closed.That is, ventilative seam 150a alternative closure or openness.
In one embodiment, the height L1 of closed ring barricade 150 is approximately equal to or the inner top surface slightly larger than cover 120
The spacing H1 of 120b and the upper surface 140u of elastic membrane 140 make the inside and outside pressure differential when electronic device 10 be less than preset pressure value
When, the second end 152 of closed ring barricade 150 presses on the inner top surface 120b of cover 120, and ventilative seam 150a is made to be in closed form
State.In one embodiment, closed ring barricade 150 and the integrally formed structure that elastic membrane 140 can be using the formation of identical material.
It is also alternative to omit closed ring barricade 150 in another embodiment.
Fig. 2 is please referred to, being painted the vent valve of Fig. 1 C reduces the schematic diagram of pressure differential, and Fig. 2-1, Fig. 2-2 are the part of Fig. 2
Enlarged drawing.With the pressure outside electronic device 10 more than the pressure in electronic device 10 for example, due to pressure differential, electronic device
The second end 152 of air push closed ring barricade 150 outside 10 opens ventilative seam 150a, and air is made to get enter into vent valve
In 100.It is forced into the air in vent valve 100 and is closed punching 140a unlatchings, and entered in electronic device 10.Such one
Come, the inside and outside pressure differential of electronic device 10 is reduced.
After pressure differential reduces, due to the elasticity of elastic membrane 140 and the elasticity of closed ring barricade 150, it is closed punching 140a
And ventilative seam 150a returns back to closed state, and the impurity outside vent valve 100 can be avoided to enter in air duct 110a or electronics
Inside device 10.
In addition, as shown in Fig. 2, Fig. 2-1, Fig. 2-2, although the second end 152 of closed ring barricade 150 opens ventilative seam
150a, so since the hole of ventilative seam 150a is very small, can stop impurity outside electronic device 10 by ventilative seam 150a into
Enter to above closure punching 140a, and then impurity is avoided to block and is closed punching 140a.In one embodiment, the ventilative seam 150a of unlatching
Hole can be between 0.01 millimeter to 1.0 millimeters.In addition, when the pressure outside electronic device 10 is less than in electronic device 10
During pressure, the flowing mode of making for being closed punching 140a and ventilative seam 150a makees flowing mode similar to above-mentioned, holds this and repeats no more.
Fig. 3 is please referred to, is painted the elastic membrane of Fig. 1 C and the vertical view of closed ring barricade.As shown in the figure, due to closing
Circular retaining wall 150 is in closed ring, therefore can enter closed ring by (360 degree) impurity stopped outside vent valves 100 fullly
In the space that barricade 150 surrounds.In addition, multiple closed ring barricades 150 of the present embodiment are concentric arrangement, right another embodiment
Also eccentric configuration.In other embodiments, the quantity of closed ring barricade 150 can be one.Although the closing of the present embodiment
Circular retaining wall 150 is illustrated by taking circle as an example, and the closed ring barricade 150 of right other embodiments can also be polygon, ellipse
Shape or other shapes.
As shown in figure 3, the quantity for being closed punching 140a is multiple, also can be so one.These are closed punching 140a arrangements
Into array type, right another embodiment also can random alignment.As long as 100 inside and outside pressure differential of vent valve can be reduced, the present invention is real
It applies example and does not limit the quantity and/or spread pattern for being closed punching 140a.
Please refer to Fig. 4 A to Fig. 4 B, Fig. 4 A are painted the exploded view of the vent valve according to another embodiment of the present invention, and Fig. 4 B
It is painted the constitutional diagram of the vent valve of Fig. 4 A.Vent valve 200 includes pedestal 110, cover 220, closely sealed washer 130, elastic membrane 140
(not being painted) and closed ring barricade 150 (not being painted).
Pedestal 110 includes the first side 111, and the first side 111 has multiple first trepanning 111a.Cover 220 includes the
Two sides 221.Compared to above-mentioned cover 120, the second trepanning 121a is omitted in second side 221 of the present embodiment.
The distance H2 of the inner top surface 220b of cover 220 and the bottom surface 221b of the second side 221 are less than the first trepanning 111a's
Height L2 makes after pedestal 110 is combined with cover 220, and the second side 221 of cover 220 covers the first trepanning of pedestal 110
A part of 111a, and expose another part of the first trepanning 111a, air can be circulated by the part of exposing.
Fig. 5 A to Fig. 5 E are please referred to, are painted the process drawing of the vent valve 100 of Figure 1B, Fig. 5 C-1 are the part of Fig. 5 C
Enlarged drawing；Fig. 5 E-1 are the partial enlarged view of Fig. 5 E.
As shown in Figure 5A, e.g. injection molding technique can be used, form pedestal 110.For example, jetting plastic material is in one
In the die cavity of mold (not being painted), to form pedestal 110.
As shown in Figure 5 B, extra quality injection molding technique can be used, in formation elastic membrane 140 in pedestal 110.For example, it projects
Plastic material is in the die cavity of same mold, to form elastic membrane 140 in pedestal 110.In the present embodiment, the material of pedestal 110
Expect that fusing point is higher than elastic membrane 140, so pedestal 110 can be avoided to be become negatively affected in the forming process of elastic membrane 140, it is such as soft
Change deformation.In addition, elastic membrane 140 and multiple closed ring barricades can be formed together in same extra quality injection molding technique
150。
As shown in Figure 5 C, several needles 20 be can be used after the curing of elastic membrane 140, pierce through elastic membrane 140 and formed it is multiple can
The closure punching 140a for selectively unlocking or being closed.Elastic membrane 140 has elastic recovery characteristic after curing.Due to being closed punching
140a is formed, therefore after needle 20 detaches elastic membrane 140 after the curing of elastic membrane 140, the elasticity being closed around punching 140a
Membrane material understands elastic recovery and is closed and is closed punching 140a, as shown in Fig. 5 C-1.
As shown in Figure 5 D, e.g. injection molding technique can be used, form cover 120.It, can as shown in Fig. 5 E, Fig. 5 E-1
Using e.g. ultrasonic combination technology, tightly fixed pedestal 110 and cover 120.Since pedestal 110 and cover 120 are tightly
With reference to, therefore can reach tamper effect.After pedestal 110 is combined with cover 120, second end 152 and the lid of closed ring barricade 150
The ventilative seam 150a of alternative closure or openness is formed between body 120.
Then, although not being painted, closely sealed washer 130 as shown in Figure 1A can be so inserted in the lower surface 110b of pedestal 110
Between hook 112.So far, vent valve 100 as shown in Figure 1B can be formed.
In addition, the manufacturing method of vent valve 200 is held this and is repeated no more similar to the manufacturing method of above-mentioned vent valve 100.
Vent valve and its electronic device of application and its manufacturing method disclosed by the above embodiment of the present invention, at least have
Following advantage：
First, in one embodiment, the elastic membrane of vent valve has the closure punching of alternative closure or openness.Work as closure
When punching is opened, inside and outside pressure differential can be reduced；When being closed punching closure, it can stop that impurity enters the air duct of vent valve
It is interior.
2nd, in one embodiment, elastic film material has elastic recovery characteristic.In this way, when pressure differential reduces, it is closed punching
Elastic film material meeting elastic recovery around hole, and it is closed punching.
3rd, in one embodiment, pedestal and cover are tightly fixed, can reach tamper effect.
4th, in one embodiment, alternative closure or openness are formed between the closed ring barricade of vent valve and cover
Ventilative seam.When ventilative seam is opened, inside and outside pressure can be reduced；When ventilative seam is closed, it can stop impurity.
Certainly, the present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, ripe
It knows those skilled in the art and makes various corresponding changes and deformation, but these corresponding changes and change in accordance with the present invention
Shape should all belong to the protection domain of appended claims of the invention.
Claims (11)
1. a kind of vent valve, which is characterized in that including：
One pedestal has an air duct；
One elastic membrane is fixedly arranged in the air duct and obstructs the air duct, which has one to be closed punching, the closure
Punching selectively closes off or is forced and opened by the closure punching both ends draught head, makes when the closure punching is opened, and allows
Gas by but prevent liquid or impurity from entering the air duct of the pedestal；And
One cover covers the elastic membrane and is fixed with the pedestal；
Wherein, which is dots structure.
2. vent valve as described in claim 1, which is characterized in that the vent valve further includes：
One closed ring barricade, including a first end and a second end, which is connected to the elastic membrane, which presses on
The second end, the ventilative seam between the cover and the second end selectively close off or by the closed ring barricade internal and external pressure difference
It forces and opens.
3. vent valve as claimed in claim 2, which is characterized in that the closed ring barricade and the elastic membrane are one of the forming knot
Structure.
4. vent valve as described in claim 1, which is characterized in that the pedestal includes one first side, which has
One first perforation；The cover includes one second side, which has one second perforation, which second passes through with this
At least part is overlapped each other in hole.
5. vent valve as described in claim 1, which is characterized in that the pedestal includes an insertion section and a hook, the insertion section
Extend from a lower surface of the pedestal, and the hook is set on one end of the insertion section；The vent valve further includes：
One closely sealed washer, between the lower surface of the pedestal and the hook.
6. a kind of electronic device, which is characterized in that including：
One casing has an opening；And
One vent valve as described in claim 1, is inserted in the opening.
7. a kind of manufacturing method of vent valve, which is characterized in that including：
A pedestal is formed, wherein the pedestal has an air duct；
An elastic membrane is formed in the pedestal, wherein the elastic membrane is fixedly arranged in the air duct；And
One is formed in the elastic membrane and is closed punching, and wherein the closure punching is dots structure, and the closure punching is selectively closed
Close or forced and opened by the closure punching both ends draught head, make when the closure punching is opened, allow gas by but prevent
Liquid or impurity enter the air duct of the pedestal.
8. the manufacturing method of vent valve as claimed in claim 7, which is characterized in that further include：
Form a cover；And
Fix the pedestal and the cover；
Wherein, fixing the pedestal and the step of cover is completed using ultrasonic technique.
9. the manufacturing method of vent valve as claimed in claim 7, which is characterized in that the step of forming the pedestal is with forming the bullet
Property film in the step in the pedestal be using extra quality injection molding complete, and the fusing point of the pedestal be higher than the elastic membrane fusing point.
10. the manufacturing method of vent valve as claimed in claim 7, which is characterized in that form the closure punching in the elastic membrane
The step of in, which formed with needle-penetration of the outer diameter between 0.01 millimeter to 1.0 millimeters.
11. the manufacturing method of vent valve as claimed in claim 7, which is characterized in that in formed the elastic membrane in the pedestal
The step of include：
With integrally formed technique, the elastic membrane and a closed ring barricade are formed.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510122181.XA CN104964074B (en) | 2015-03-19 | 2015-03-19 | The electronic device and its manufacturing method of vent valve and the application vent valve |
| TW104130433A TWI612245B (en) | 2015-03-19 | 2015-09-15 | Vent valve, electronic device using the same and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510122181.XA CN104964074B (en) | 2015-03-19 | 2015-03-19 | The electronic device and its manufacturing method of vent valve and the application vent valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104964074A CN104964074A (en) | 2015-10-07 |
| CN104964074B true CN104964074B (en) | 2018-07-03 |
Family
ID=54218126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510122181.XA Active CN104964074B (en) | 2015-03-19 | 2015-03-19 | The electronic device and its manufacturing method of vent valve and the application vent valve |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN104964074B (en) |
| TW (1) | TWI612245B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110948385B (en) * | 2019-01-08 | 2020-08-14 | 华海清科股份有限公司 | Elastic membrane for chemical mechanical polishing |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2875813Y (en) * | 2006-03-15 | 2007-03-07 | 珠海天威技术开发有限公司 | Ink box of ink jet printing machine and its pressure difference regulating valve |
| DE102006021564B3 (en) * | 2006-05-08 | 2007-03-29 | Ccc Udo Suffa Gmbh | Self-closing valve for supplying a fluid from a volume has cover with guide seat with pressure sensitive membrane and air channel |
| DE102009030186A1 (en) * | 2009-06-24 | 2011-01-05 | Joachim Kern | diaphragm valve |
| CN201909072U (en) * | 2010-11-22 | 2011-07-27 | 惠州市沃瑞科技有限公司 | Waterproof, dustproof, ventilated and heat-dissipating breathing device of outdoor seal equipment |
| CN202118332U (en) * | 2011-03-01 | 2012-01-18 | 厦门建霖工业有限公司 | Structure of water saving device |
| CN203453567U (en) * | 2013-08-27 | 2014-02-26 | 上海文依电器有限公司 | Threaded waterproof air valve |
-
2015
- 2015-03-19 CN CN201510122181.XA patent/CN104964074B/en active Active
- 2015-09-15 TW TW104130433A patent/TWI612245B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104964074A (en) | 2015-10-07 |
| TWI612245B (en) | 2018-01-21 |
| TW201634846A (en) | 2016-10-01 |
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