CN109999334A - A kind of Medical check valve and its injecting method using negative pressure return - Google Patents
A kind of Medical check valve and its injecting method using negative pressure return Download PDFInfo
- Publication number
- CN109999334A CN109999334A CN201910190840.1A CN201910190840A CN109999334A CN 109999334 A CN109999334 A CN 109999334A CN 201910190840 A CN201910190840 A CN 201910190840A CN 109999334 A CN109999334 A CN 109999334A
- Authority
- CN
- China
- Prior art keywords
- spool
- check valve
- sealing
- medical check
- valve body
- 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.)
- Pending
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/22—Valves or arrangement of valves
- A61M39/24—Check- or non-return valves
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/22—Valves or arrangement of valves
- A61M39/24—Check- or non-return valves
- A61M2039/2426—Slit valve
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/22—Valves or arrangement of valves
- A61M39/24—Check- or non-return valves
- A61M2039/2433—Valve comprising a resilient or deformable element, e.g. flap valve, deformable disc
Abstract
The present invention relates to a kind of Medical check valve and its injecting methods.The Medical check valve is only made of two components of valve body and spool, have lower limit bit architecture to prevent spool slide downward from going out valve body between spool and the cavity of valve body, has upper limit structure to prevent spool upward sliding from going out valve body between spool and the cavity of valve body；Active strokes between spool and the cavity of valve body are divided into sealing structure region and conducting structure region, wherein sealing structure region is located at the lower part in conducting structure region；When work, when spool moves to conducting structure region under syringe effect, Medical check valve is in the conductive state, and when spool is returned to sealing structure region under the suction function in the medication injections component that Medical check valve is connected, Medical check valve is in sealing state.After adopting the above structure, the present invention has the characteristics that component is few, assembly is simple, at low cost, realizes return automatically using negative pressure.
Description
Technical field
The present invention relates to medical instrument check valve technical fields, are only made of, utilize two components more particularly, to one kind
The Medical check valve of negative pressure return and its injecting method.
Background technique
For medical check valve medically using very extensive, such as the injection being set in front of syringe is unidirectional
The component of valve, existing Medical check valve is more, assembles more complicated, existing medical treatment check valve too busy to get away valve body, valve deck, valve
Core and spring this four components, automatically reset to realize, especially be unable to do without this component of valve deck, make spool be in sealing and
Both states are connected, also, mostly realized using the structure of elastic recovery spool return sealing, this structure it is medical
The component of check valve is more, higher cost, and assembly is cumbersome, also, in some medical treatment situations, the sealing of spool is still led
Logical state needs controllable adjustment, and therefore, how to optimize existing medical check valve keeps its component less, and assembly is simpler and saves
About cost, simplified assembly technology, which becomes, technical problem to be solved.
Summary of the invention
The purpose of the present invention is to the one kind provided in place of the deficiencies in the prior art to be only made of simultaneously two components
Using the Medical check valve and its injecting method of negative pressure return mode.
In order to achieve the above objectives, the technical scheme is that a kind of Medical check valve using negative pressure return, this is medical
Check valve is only made of two components of valve body and spool, and valve body is the component of hollow structure, and the intracorporal cavity of valve is connected by top
Chamber, middle part seal chamber and lower part grafting chamber composition, spool are made of elastic soft material, and spool is movably arranged on the chamber of valve body
It can move in vivo and in the cavity of valve body, have lower limit bit architecture to prevent spool between spool and the cavity of valve body
Slide downward goes out valve body, has upper limit structure to prevent spool upward sliding from going out valve body between spool and the cavity of valve body；
Active strokes between spool and the cavity of valve body are divided into sealing structure region and conducting structure region, wherein sealing structure
Region is located at the lower part in conducting structure region；When work, when spool moves to conducting structure region under syringe effect, doctor
It is in the conductive state with check valve, when spool is replied under the suction function in the medication injections component that Medical check valve is connected
When to sealing structure region, Medical check valve is in sealing state.
The sealing structure region includes the intracorporal inverted conical shape sealing surface of chamber of one or more valve bodies, one or more
Spool inverted conical shape face on spool, the spool inverted conical shape face inverted conical shape sealing surface sealing corresponding with body cavity body on the spool
Cooperation；Under sealing state, spool inverted conical shape face is inserted into the intracorporal inverted conical shape sealing surface of chamber and forms tapered surface sealing；On state
Under, spool stress moves up, and spool inverted conical shape face separates to form conducting gap with the intracorporal inverted conical shape sealing surface of chamber.
If forming the dome of arterial highway increase and spool inverted conical shape face sealing force on the intracorporal inverted conical shape sealing surface of chamber
Ring.
The sealing structure region include have on the outer circumference surface for be molded over spool one or multi-channel ring type seal and
With the circular cylindrical cavity of ring type seal movable sealing cooperation；Under sealing state, the ring type seal of spool is plugged in cylinder
The sealing of shape cavity inner wall；Under on state, spool stress is moved up, and the ring type seal of spool, which separates to be formed with circular cylindrical cavity, leads
Logical gap.
The sealing structure region includes to be shaped to T-shaped spool, under sealing state, the T word rank of T-shaped spool
Tread, which is pressed on corresponding valve body cavity object table terrace, forms sealing；Under on state, T-shaped spool stress is moved up, T-shaped
Spool T word cascaded surface separated with corresponding valve body cavity object table terrace to be formed conducting gap.
The upper limit structure includes: the bottom end of the spool is plugged in the grafting chamber of lower part, on the bottom end of spool
Equipped with limit outer lug, in lower part, the upper surface of grafting chamber is equipped with upper limit inner edge, and the size of the limit outer lug is greater than the upper limit
The size of position inner edge is provided with the conducting groove of lower edges connection in limit outer lug, and after spool and valve body assemble, limit is outer
Protrusion is supported and is located on upper limit inner edge, and the conducting groove of lower edges connection is for liquid or gas connection lower part grafting chamber
With middle part seal chamber to realize injection.
The detent of getting out of a predicament or an embarrassing situation with lower limit inner edge cooperation is correspondingly provided on the spool, when spool is by negative pressure return,
Detent of getting out of a predicament or an embarrassing situation is fastened on lower limit inner edge to realize the lower limit bit architecture.
Axially spaced-apart offers several road conductance slots on the inner wall of the upper guide cavity, is provided with and leads on spool bottom face
Logical groove.
A kind of injecting method of the Medical check valve using negative pressure return, includes the Medical check valve, syringe, doctor
Injecting assembly is treated, medication injections component and the outlet fixation of the Medical check valve are connected together, injecting step are as follows:
Step 1 will be injected into liquid or gas in syringe, the mouth pipe of syringe is inserted into the Medical check valve
It is interior and top sets spool and shifts up conducting structure region, while the lower part grafting of the outer wall of syringe nozzle pipe and check valve upwards
Cavity wall sealing；
Liquid or gas are injected into Medical check valve by step 2, the piston of push injection device from syringe, are passed through
Behind conducting structure region, it is injected by medication injections component；
Step 3 after to be injected, extracts syringe, and the spool of the Medical check valve is replied under the action of negative pressure
To the initial sealing structure region.
A kind of injecting method of the Medical check valve using negative pressure return, the medication injections component are air bag or air bag
With other medical ventilation parts of connection air bag.
After adopting the above structure, the present invention only passes through two components of valve body and spool and just constitutes entire Medical check valve,
Component is few, at low cost, does not need valve deck and special elastic recoil structure, in use, the present invention directly with medical ventilation part
In the fixed application that is connected together of air bag, after having injected, since the air pressure after being injected in the air bag of medical ventilation part is lower than
Atmospheric pressure, when pulling out syringe, Medical check valve of the present invention, which just will form negative pressure compressing spool, makes spool return to sealing station.
From the foregoing, it will be observed that the present invention has, component is few, assembly is simple, at low cost, realizes return automatically using negative pressure and omits mechanical return
The characteristics of structure.
Detailed description of the invention
Fig. 1 is the structural decomposition diagram of the first embodiment of the invention；
Fig. 2 is the schematic perspective view of the first embodiment spool of the invention；
Fig. 3 is the first embodiment sealing state the schematic diagram of the section structure of the invention；
Fig. 4 is the first embodiment on state the schematic diagram of the section structure of the invention；
Fig. 5 is second of embodiment sealing state the schematic diagram of the section structure of the invention；
Fig. 6 is second of embodiment on state the schematic diagram of the section structure of the invention；
Fig. 7 is the third embodiment sealing state the schematic diagram of the section structure of the invention；
Fig. 8 is the third embodiment on state the schematic diagram of the section structure of the invention；
Fig. 9 is the sealing state the schematic diagram of the section structure of the embodiment of the present invention one；
Figure 10 is the on state the schematic diagram of the section structure of the embodiment of the present invention one；
Figure 11 is the sealing state the schematic diagram of the section structure of the embodiment of the present invention two；
Figure 12 is the on state the schematic diagram of the section structure of the embodiment of the present invention two.
Specific embodiment
As shown in figs. 1-12, the technical scheme is that a kind of Medical check valve 100 using negative pressure return, the doctor
It is only made of 20 two components of valve body 10 and spool with check valve 100, valve body 10 is the component of hollow structure, the chamber in valve body 10
Body 11 is made of upper guide cavity 111, middle part seal chamber 112 and lower part grafting chamber 113, and spool 20 is by elastic soft material system
Be movably arranged in the cavity 11 of valve body 10 and can be moved in the cavity 11 of valve body 10 at, spool 20, spool 20 with
Have lower limit bit architecture 30 to prevent 20 slide downward of spool from going out valve body 10 between the cavity 11 of valve body 10, in spool 20 and valve body
Have upper limit structure 40 to prevent 20 upward sliding of spool from going out valve body 10 between 10 cavity 11；In spool 20 and valve body 10
Active strokes between cavity 11 are divided into sealing structure region 51 and conducting structure region 52, wherein 51, sealing structure region
In the lower part in conducting structure region 52；When work, when spool 20 moves to conducting structure region 52 under the effect of syringe 300
When, Medical check valve 100 is in the conductive state, when spool 20 is in the medication injections component 200 that Medical check valve 100 is connected
Suction function under when being returned to sealing structure region 51, Medical check valve 100 is in sealing state.
Embodiment one as shown in Figs 1-4, the sealing structure region 51 includes the cavity 11 of one or more valve bodies 10
Spool inverted conical shape face 21 on interior inverted conical shape sealing surface 114, one or more spools 20, the spool inverted conical shape on the spool 20
The sealing of inverted conical shape sealing surface 114 cooperation corresponding with 10 inner chamber body 11 of valve body of face 21；Under sealing state, spool inverted conical shape face 21 is inserted
Enter to the inverted conical shape sealing surface 114 in cavity 11 and forms tapered surface sealing；Under on state, 20 stress of spool is moved up, and spool falls
Vertebra shape face 114 separates to form conducting gap with the inverted conical shape sealing surface 114 in cavity 11.
If forming arterial highway on the inverted conical shape sealing surface 114 in the cavity 11 to increase and spool inverted conical shape face sealing force
Dome ring 114a.
Embodiment three as Figure 7-8, the sealing structure region 51 includes to be molded on the outer circumference surface of spool 20
There are one or multi-channel ring type seal 22 and the circular cylindrical cavity 115 with 22 movable sealing of ring type seal cooperation；Seal shape
Under state, the ring type seal 22 of spool 20 is plugged in the sealing of 115 inner wall of circular cylindrical cavity；Under on state, in 20 stress of spool
It moves, the ring type seal 22 of spool 20 separates to form conducting gap with circular cylindrical cavity 115.
Embodiment two as seen in figs. 5-6, the sealing structure region 51 include to be shaped to T-shaped spool 20, sealing
Under state, formed on the step surface 116 that the T word cascaded surface 23 of T-shaped spool 20 is pressed in corresponding 10 cavity 11 of valve body
Sealing；Under on state, T-shaped 20 stress of spool is moved up, the T word cascaded surface 23 of T-shaped spool 20 and corresponding valve body
The separation of step surface 116 in 10 cavitys 11 forms conducting gap.
The upper limit structure 40 includes: the bottom end 24 of the spool 20 is plugged in lower part grafting chamber 113, in spool
20 bottom end 24 is equipped with limit outer lug 241, and in lower part, the upper surface of grafting chamber 113 is equipped with upper limit inner edge 113a, the limit
The size of position outer lug 241 is greater than the size of upper limit inner edge 113a, and lower edges connection is provided in limit outer lug 241
Groove 242 is connected, after spool 20 and valve body 10 assemble, limit outer lug 241, which is supported, to be located on upper limit inner edge 113a, and it is described on
The conducting groove 242 of lower edge connection is for liquid or gas connection lower part grafting chamber 113 and middle part seal chamber 112 to realize note
It penetrates.
The cavity of the valve body 10 is made of upper guide cavity 111, middle part seal chamber 112 and lower part grafting chamber 113, middle part
The bottom surface of seal chamber 112 is to be correspondingly provided on spool 20 and cooperate with the lower limit inner edge 112a with lower limit inner edge 112a
Detent 25 of getting out of a predicament or an embarrassing situation, when spool is by negative pressure return, detent of getting out of a predicament or an embarrassing situation is fastened on lower limit inner edge to realize the lower limit
Bit architecture 30.
Axially spaced-apart offers several road conductance slot 111a on the inner wall of the upper guide cavity 111, in 20 bottom end of spool
Conducting groove 242 is provided on face 24.
A kind of injecting method of the Medical check valve using negative pressure return includes the Medical check valve 100, syringe
300, medication injections component 200, medication injections component 200 and the outlet fixation of the Medical check valve 100 are connected together, and infuse
Penetrate step are as follows:
Step 1, will be injected into liquid or gas in syringe 300, and the mouth pipe 310 of syringe 300 is inserted into the doctor
Spool 20, which is set, in check valve 100 and upwards top shifts up conducting structure region 52, while the outer wall of syringe nozzle pipe 310
It is sealed with 113 inner wall of lower part grafting chamber of check valve；
Liquid or gas are injected into Medical check valve from syringe 300 by step 2, the piston of push injection device 300
In 100, behind conducting structure region 52, it is injected by medication injections component 200；
Step 3 after to be injected, extracts syringe 300, the work of the spool 20 of the Medical check valve 100 in negative pressure
The initial sealing structure region 51 is returned under.
A kind of injecting method of the Medical check valve using negative pressure return, the medication injections component 200 be air bag 210 or
The medical ventilation part of other of person's air bag 210 and connection air bag 210.
In this way, the present invention, which only passes through 20 two components of valve body 10 and spool, just constitutes entire Medical check valve 100, component
It is few, it is at low cost, valve deck and special elastic recoil structure are not needed, in use, the present invention is directly and in medical ventilation part
The fixed application that is connected together of air bag 210, after having injected, since the air pressure after being injected in the air bag 210 of medical ventilation part is low
In atmospheric pressure, when pulling out syringe 300, Medical check valve 100 of the present invention, which just will form negative pressure compressing spool 20, makes spool 20
Return to sealing station.From the foregoing, it will be observed that the present invention has, component is few, assembly is simple, at low cost, realize return automatically using negative pressure and
The characteristics of omitting mechanical return structure.
Certainly, the present invention can also have other numerous embodiments, ripe without departing substantially from spirit of that invention and essence
Various corresponding changes and modifications, but these corresponding changes and modifications ought can be made according to invention by knowing those skilled in the art
It all should belong to the protection scope of invention the attached claims.
Claims (10)
1. a kind of Medical check valve using negative pressure return, it is characterised in that: the Medical check valve is only by valve body and spool two
Component composition, valve body are the component of hollow structure, and the intracorporal cavity of valve is by upper guide cavity, middle part seal chamber and lower part grafting chamber
Composition, spool are made of elastic soft material, and spool is movably arranged in the cavity of valve body and can be along the cavity of valve body
Interior movement, between spool and the cavity of valve body have lower limit bit architecture to prevent spool slide downward from going out valve body, spool with
Have upper limit structure to prevent spool upward sliding from going out valve body between the cavity of valve body；Between spool and the cavity of valve body
Active strokes are divided into sealing structure region and conducting structure region, wherein sealing structure region is located under conducting structure region
Portion；When work, when spool moves to conducting structure region under syringe effect, Medical check valve is in the conductive state, when
When spool is returned to sealing structure region under the suction function in the medication injections component that Medical check valve is connected, medical list
Sealing state is in valve.
2. a kind of Medical check valve using negative pressure return according to claim 1, it is characterised in that: the sealing structure
Region includes the intracorporal inverted conical shape sealing surface of chamber of one or more valve bodies, the spool inverted conical shape on one or more spool
Face, the spool inverted conical shape face inverted conical shape sealing surface sealing cooperation corresponding with body cavity body on the spool；Under sealing state, valve
Core inverted conical shape face is inserted into the intracorporal inverted conical shape sealing surface of chamber and forms tapered surface sealing；Under on state, spool stress is moved up, valve
Core inverted conical shape face separates to form conducting gap with the intracorporal inverted conical shape sealing surface of chamber.
3. a kind of Medical check valve using negative pressure return according to claim 2, it is characterised in that: the chamber is intracorporal
If forming the dome ring of arterial highway increase and spool inverted conical shape face sealing force on inverted conical shape sealing surface.
4. a kind of Medical check valve using negative pressure return according to claim 1, it is characterised in that: the sealing structure
Region includes to have one or multi-channel ring type seal and close with the ring type seal activity on the outer circumference surface for be molded over spool
Seal the circular cylindrical cavity of cooperation；Under sealing state, the ring type seal of spool is plugged in the sealing of circular cylindrical cavity inner wall；Shape is connected
Under state, spool stress is moved up, and the ring type seal of spool separates to form conducting gap with circular cylindrical cavity.
5. a kind of Medical check valve using negative pressure return according to claim 1, it is characterised in that: the sealing structure
Region includes to be shaped to T-shaped spool, and under sealing state, the T word cascaded surface of T-shaped spool is pressed on corresponding valve body
Sealing is formed on cavity step surface；Under on state, T-shaped spool stress is moved up, the T word cascaded surface of T-shaped spool with
Corresponding valve body cavity object table terrace separates to form conducting gap.
6. -5 described in any item a kind of Medical check valves using negative pressure return according to claim 1, it is characterised in that: institute
Stating upper limit structure includes: the bottom end of the spool is plugged in the grafting chamber of lower part, and it is outer that limit is equipped on the bottom end of spool
Protrusion, in lower part, the upper surface of grafting chamber is equipped with upper limit inner edge, and the size of the limit outer lug is greater than the ruler of upper limit inner edge
It is very little, the conducting groove of lower edges connection is provided in limit outer lug, after spool and valve body assemble, limit outer lug, which is supported, to be located at
On upper limit inner edge, and the conducting groove of lower edges connection is sealed for liquid or gas connection lower part grafting chamber and middle part
Chamber is to realize injection.
7. a kind of Medical check valve using negative pressure return according to claim 6, it is characterised in that: in the valve body
The bottom surface of portion's seal chamber is that the card of getting out of a predicament or an embarrassing situation with lower limit inner edge cooperation is correspondingly provided on spool with lower limit inner edge
Position, when spool is by negative pressure return, detent of getting out of a predicament or an embarrassing situation is fastened on lower limit inner edge to realize the lower limit bit architecture and realize
Sealing.
8. a kind of Medical check valve using negative pressure return according to claim 7, it is characterised in that: the top conducting
Axially spaced-apart offers several road conductance slots on the inner wall of chamber, and conducting groove is provided on spool bottom face.
9. using a kind of injecting method of the Medical check valve using negative pressure return described in claim 1, it is characterised in that: packet
The Medical check valve, syringe, medication injections component are included, medication injections component and the outlet of the Medical check valve are fixed
It is connected together, injecting step are as follows:
Step 1 will be injected into liquid or gas in syringe, the mouth pipe of syringe is inserted into the Medical check valve simultaneously
Top sets spool and shifts up conducting structure region upwards, while in the lower part grafting chamber of the outer wall of syringe nozzle pipe and check valve
Wall sealing；
Liquid or gas are injected into Medical check valve by step 2, the piston of push injection device from syringe, by conducting
After structural region, it is injected by medication injections component；
Step 3 after to be injected, extracts syringe, and the spool of the Medical check valve is returned to just under the action of negative pressure
The sealing structure region begun.
10. a kind of injecting method of Medical check valve using negative pressure return according to claim 9, it is characterised in that:
The medication injections component is other medical ventilation parts of air bag or air bag and connection air bag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910190840.1A CN109999334A (en) | 2019-03-14 | 2019-03-14 | A kind of Medical check valve and its injecting method using negative pressure return |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910190840.1A CN109999334A (en) | 2019-03-14 | 2019-03-14 | A kind of Medical check valve and its injecting method using negative pressure return |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109999334A true CN109999334A (en) | 2019-07-12 |
Family
ID=67167000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910190840.1A Pending CN109999334A (en) | 2019-03-14 | 2019-03-14 | A kind of Medical check valve and its injecting method using negative pressure return |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109999334A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2823725Y (en) * | 2005-08-26 | 2006-10-04 | 珠海格力电器股份有限公司 | Check valve |
| CN102102773A (en) * | 2009-12-21 | 2011-06-22 | 乐金电子(天津)电器有限公司 | Check valve |
| CN206600499U (en) * | 2017-04-05 | 2017-10-31 | 厦门微能电子科技有限公司 | A kind of dual-seal improved structure of unidirectional gas circuit |
| CN108953700A (en) * | 2018-09-03 | 2018-12-07 | 黄艺强 | A kind of pipe internal pressure automatic flow-stop device and its application |
| CN109114264A (en) * | 2018-10-11 | 2019-01-01 | 梧州市旺捷机械制造有限公司 | It is a kind of on bottle placer without spring non-return valve |
| CN211327767U (en) * | 2019-03-14 | 2020-08-25 | 广州市一森生物科技有限公司 | Medical one-way valve capable of returning by utilizing negative pressure |
-
2019
- 2019-03-14 CN CN201910190840.1A patent/CN109999334A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2823725Y (en) * | 2005-08-26 | 2006-10-04 | 珠海格力电器股份有限公司 | Check valve |
| CN102102773A (en) * | 2009-12-21 | 2011-06-22 | 乐金电子(天津)电器有限公司 | Check valve |
| CN206600499U (en) * | 2017-04-05 | 2017-10-31 | 厦门微能电子科技有限公司 | A kind of dual-seal improved structure of unidirectional gas circuit |
| CN108953700A (en) * | 2018-09-03 | 2018-12-07 | 黄艺强 | A kind of pipe internal pressure automatic flow-stop device and its application |
| CN109114264A (en) * | 2018-10-11 | 2019-01-01 | 梧州市旺捷机械制造有限公司 | It is a kind of on bottle placer without spring non-return valve |
| CN211327767U (en) * | 2019-03-14 | 2020-08-25 | 广州市一森生物科技有限公司 | Medical one-way valve capable of returning by utilizing negative pressure |
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