CN104208792B - For the check valve of lung ventilator and with its lung ventilator - Google Patents
For the check valve of lung ventilator and with its lung ventilator Download PDFInfo
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- CN104208792B CN104208792B CN201310215490.2A CN201310215490A CN104208792B CN 104208792 B CN104208792 B CN 104208792B CN 201310215490 A CN201310215490 A CN 201310215490A CN 104208792 B CN104208792 B CN 104208792B
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Abstract
The invention discloses a kind of check valve for lung ventilator and with its lung ventilator.The check valve, including：Valve body, valve body is interior to have valve chamber, and valve chamber has inlet and outlet；Guide holder, guide holder, which is located in exit and guide holder, has guide through hole；Spool, spool are located in valve chamber, the axially movable direction one-way conduction valve chamber with along import towards outlet that the one end fits of spool are in guide through hole and spool is along valve body；Spool is only only supported in first spring, one end of the first spring to guide holder and the other end；And the inertial device for spool vibration frequency of decaying in the axial direction.Check valve for lung ventilator according to embodiments of the present invention is by setting inertial device, and can decay spool vibration frequency well, and so as to effectively reduce noise, practicability is high.
Description
Technical field
The present invention relates to medical instruments fields, in particular to a kind of check valve for lung ventilator and have its
Lung ventilator.
Background technology
In current straight check valve, when gas is by the gap of ball and check valve body O-ring seal, it can cause
Gas pressure declines, and is shaken in the axial direction so as to cause ball base, ball base axial vibrations can generate noise, it is impossible to meet and use
Mute requirement during lung ventilator, poor practicability.
Invention content
The present invention is directed at least solve one of technical problem in the prior art.For this purpose, one object of the present invention
It is to propose a kind of check valve for lung ventilator, which has inertial device, which can be used for spool of decaying
Vibration frequency, have the characteristics that noise is small so as to the check valve.
It is another object of the present invention to propose a kind of lung ventilator, which includes above-mentioned check valve, the breathing
Machine has the characteristics that noise is small.
Check valve according to the present invention for lung ventilator, including：Valve body, valve body is interior to have valve chamber, and valve chamber has import
And outlet；Guide holder, guide holder, which is located in exit and guide holder, has guide through hole；Spool, spool are located in valve chamber, spool
One end fits in guide through hole and spool along valve body it is axially movable with along import towards outlet direction unidirectionally lead
Port valve chamber；Spool is only only supported in first spring, one end of the first spring to guide holder and the other end；And for decaying in the axial direction
The inertial device of spool vibration frequency.
Check valve according to the present invention for lung ventilator, by setting inertial device, can decay spool well
Vibration frequency, so as to effectively reduce noise.
In addition, the check valve according to the present invention for lung ventilator also has following additional technical feature：
Spool includes insert body, and one end nearer apart from import of insert body is provided with valve core head, insert body
Flange is provided on peripheral surface, flange is separated from each other in the axial direction with valve core head.
Inertial device includes：First inertial mass of annular, the first inertial mass are slideably sleeved on the outside of spool and in axis
Upwards between valve core head and flange；Second spring, second spring are sleeved on the both ends difference of the outside of spool and second spring
Only support valve core head and the first inertial mass；And third spring, third spring pocket is at the outside of spool and the both ends of third spring point
Flange and the first inertial mass Zhi not supported.
Valve core head is gradually increased for the radial dimension of feather valve core print and valve core head along from import towards the direction of outlet.
The radial dimension of valve core head gradually increases, and set on the peripheral surface of valve core head along from import towards the direction of outlet
There is the elastic seal ring of annular.
Inertial device includes：Second inertial mass of annular, the second inertial mass are slideably sleeved on the outside of spool and in axis
Upwards between valve core head and flange；First elastic ring, the first elastic ring is sleeved on the outside of spool and the first elastic ring is squeezed
It is pressed between valve core head and the second inertial mass；Second elastic ring, the second elastic ring are sleeved on the outside of spool and the second elastic ring quilt
It is extruded between flange and the second inertial mass.
Multiple channels are formed on guide holder closing outlet and guide holder, channel penetrates through guide holder in the axial direction.
Check valve according to the present invention further includes：Filter device, filter device is located on valve body and and inlet communication.
The gas pressure range allowable of check valve is：300KPa-600KPa.
Lung ventilator according to the present invention, including the above-mentioned check valve for lung ventilator.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
It obtains significantly or is recognized by the practice of the present invention.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination accompanying drawings below to embodiment
Significantly and it is readily appreciated that, wherein：
Fig. 1 is the schematic diagram of check valve according to an embodiment of the invention；
Fig. 2 is the schematic diagram of check valve according to an embodiment of the invention；
Fig. 3 is the stereogram of check valve according to an embodiment of the invention.
100th, check valve；
1st, valve body；11st, valve chamber；111st, import；112nd, it exports；12nd, boss；121st, inclined-plane；
2nd, guide holder；21st, guide through hole；22nd, channel；
3rd, spool；31st, valve core head；311st, head portion；312nd, end section；32nd, flange；
4th, the first spring；
5th, inertial device；51a, the first inertial mass；51b, the second inertial mass；52nd, second spring；53rd, third spring；54、
First elastic ring；55th, the second elastic ring；
6th, filter device
7a, 7b, sealing ring.
Specific embodiment
The embodiment of the present invention is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, and is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " on ", " under ",
The orientation or position relationship of the instructions such as "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer " 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 dark
Show that signified device or element there must be specific orientation, with specific azimuth configuration and operation, therefore it is not intended that right
The limitation of the present invention.In addition, term " first ", " second " are only used for description purpose, and it is not intended that instruction or hint are opposite
Importance or the implicit quantity for indicating indicated technical characteristic.Define " first " as a result, the feature of " second " can be bright
Show or implicitly include one or more this feature.In the description of the present invention, unless otherwise indicated, " multiple " contain
Justice is two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or be integrally connected；It can
To be mechanical connection or be electrically connected；It can be directly connected, can also be indirectly connected by intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Below with reference to Fig. 1 to Fig. 3 descriptions check valve 100 for lung ventilator according to embodiments of the present invention.
Check valve 100 for lung ventilator according to embodiments of the present invention, including：Valve body 1, guide holder 2, spool 3, first
Spring 4 and inertial device 5.
Wherein there is valve chamber 11 in valve body 1.Spool 3 can be installed in valve chamber 11.
As depicted in figs. 1 and 2, valve chamber 11 has import 111（For example, in Fig. 1 and Fig. 2 valve chamber 11 right openings）, valve
Chamber 11 has outlet 112（For example, the left side of valve chamber 11 is open in Fig. 1 and Fig. 2）.
As depicted in figs. 1 and 2, guide holder 2 is located at outlet 112.It is understood that guide holder 2 can be removable with valve body 1
It connects with unloading, such as guide holder 2 can be threaded connection with to the outlet 112 of valve body 1.
There is guide through hole 21, one end of spool 3 in guide holder 2（Such as left end）Cooperation is in guide through hole 21.It is oriented to
Through-hole 21 is for limiting 3 diametrical degree of freedom of spool, so as to make spool 3 that can only be slided on the axial direction of guide through hole 21
It is dynamic, it ensure that the uniqueness that spool 3 moves.It is understood that kollag can be set in guide through hole 21, in this way
The snug sliding fit of spool 3 and guide through hole 21 can be better achieved, that is to say, that lubricant can lead spool 3
It is more preferably more swimmingly slided on the axial direction of through-hole 21, reduces friction, increase the service life of spool 3.
As shown in figure 3, guide through hole 21 can be cylindrical hole, guide through hole 21 is preferably formed in the center of spool 3,
In other words, the central axis of guide through hole 21 is overlapped with the central axis of spool 3.As shown in figure 3, it is formed on guide holder 2
There are multiple channels 22, channel 22 penetrates through guide holder 2 in the axial direction of valve body 1, and the gas in such valve chamber 11 can be from multiple logical
It flows out in road 22.For example, in figure 3, it is circumferential around guide through hole 21 that 6 channels, 22,6 channels 22 are formed on guide holder 2
It is even to be distributed on guide holder 2.It is understood that the shape of channel 22, quantity and size are all can be according to the reality of guide holder 2
Border situation and specifically set.For example, as shown in figures 1 and 3, channel 22 can be configured to cylindrical hole, in channel 22
Mandrel line can be with the centerline axis parallel of guide holder 2.
Spool 3 is located in valve chamber 11.As depicted in figs. 1 and 2, the boss of annular can be formed on the internal face of valve chamber 11
12.One end of boss 12 and spool 3（Such as right end）Adaptation, such as the left end of boss 12 are configured with connection inclined-plane 121, the inclined-plane
121 radial dimension is gradually increased along from import 111 towards the direction of outlet 112, that is to say, that the inclined-plane 121 is configured to justify
Platform shape face, the cooperation that thus inclined-plane 121 can preferably with spool 3, so as to form sealing.
As described above, one end of spool 3（Such as left end）In guide through hole 21, guide through hole 21 defines spool for cooperation
3 diametrical degree of freedom, gas enter valve chamber 11 from the import 111 of valve chamber 11, when the arrival of 111 gas pressure of import is certain big
After small, the gas pressure acted on 3 right side of spool is enough to overcome the elastic force of the first spring 4, so as in gas pressure
Effect is lower to push spool 3 to be slided to the left along the axial direction of valve body 1, is just formed in this way between connection inclined-plane 121 and the right end of spool 3
Gap, gas can enter and can be flowed out from channel 22 from the gap.
And when gas reverse flow, such as gas enters from channel 22 in valve chamber 11, and under the action of gas pressure, valve
The right end of core 3 by push against boss 12 left end, gas pressure is bigger, 3 right end of spool contacted with 12 left end of boss it is closer, two
It is sealed between person more preferable, that is to say, that gas is in outlet 112 towards cannot pass through on the direction of import 111.As a result, according to this
Invention one embodiment check valve 100 has the function of one-way conduction.
As depicted in figs. 1 and 2, one end of the first spring 4（Such as the left end in Fig. 1 and Fig. 2）Only support guide holder 2 and another
End（Such as the right end in Fig. 1 and Fig. 2）Spool 3 is only supported, the first spring 4 is in normal compressive state.When 111 gas pressure of import not
When being enough to overcome the elastic force of the first spring 4, spool 3 is pressed against to the inclined-plane of boss 12 under the elastic force effect of the first spring 4
On 121, sealing is formed therebetween, and gas cannot pass through.
And when 111 gas pressure of import is enough to overcome the elastic force of the first spring 4, gas pressure pushes spool 3 in valve
It is slided in the axial direction of body 1 to 112 directions of outlet, so as to form gap between the right end of spool 3 and inclined-plane 121, gas passes through
It is flowed to outlet 112 in gap.When gas flows through the gap, due to change in flow, lead to gas pressure change, so as to destroy
The balance of gas pressure and the first spring 4, spool 3 will move back and forth in the axial direction（Vibrations）, form certain vibration frequency.
Inertial device 5 in spool 3 or so accelerates moving process, can add the inertia force of a negative direction to spool 3,
Influencing the vibration frequency that spool 3 moves left and right, that is to say, that inertial device 5 is used for 3 vibration frequency of spool of decaying in the axial direction,
So as to effectively reduce the vibration frequency of spool 3, and then reduce noise.
Check valve 100 for lung ventilator according to embodiments of the present invention, can be well by setting inertial device 5
The vibration frequency of attenuation spool 3, so as to effectively reduce noise.
In one embodiment of the invention, as shown in Fig. 2, spool 3 include insert body, insert body apart from import
111 nearer one end（Such as the right end in Fig. 1 and Fig. 2）It is provided with valve core head 31.
As shown in Fig. 2, the radial dimension of valve core head 31 is gradually increased along from import 111 towards the direction of outlet 112.In this way
It can preferably coordinate with inclined-plane 121, prevent gas leakage.
Of course, it should be understood that as shown in Figure 1, valve core head 31 may be alternatively formed to it is I-shaped, specifically, in the embodiment
In, valve core head 31 may include head portion 311 and end section 312, and head portion 311 and end section 312 are in the axis of spool 3
It is separated from each other upwards, the radial dimension of end section 312 is more than the radial dimension of insert body, the radial direction of head portion 311
Size can be gradually increased along from import 111 towards the direction of outlet 112, be set between head portion 311 and end section 312
There are sealing ring 7b, sealing ring 7b that can coordinate with inclined-plane 121 so as to form sealing, prevent gas leakage.
Certainly, the present invention is not limited thereto, for other 31 structures of valve core head, matches as long as can realize with the sealing of inclined-plane 121
Conjunction prevents gas leakage from both falling in protection scope of the present invention.
According to some embodiments of the present invention, valve core head 31 can be feather valve core print, for example, feather valve core print can be silicon
Glue valve core head.In this way valve core head 31 and 121 resilient engagement of inclined-plane can be better protected from gas from valve core head 31 and inclined-plane 121 it
Between slot leakage.
Flange 32 is provided on the peripheral surface of insert body, flange 32 is separated from each other in the axial direction with valve core head 31.Such as
Shown in Fig. 1 and Fig. 2, the flange 32 of spool 3 can be used for fixing one end of the first spring 4（Right end as in Figure 1 and Figure 2）.
In one embodiment of the invention, as shown in Fig. 2, inertial device 5 includes the first inertial mass 51a of annular, the
Two springs 52 and third spring 53.
First inertial mass 51a be slideably sleeved on the outside of spool 3 and be presented axially in valve core head 31 and flange 32 it
Between.That is, the first inertial mass 51a of annular is set in the outside of the spool 3 between valve core head 31 and flange 32.
Second spring 52 is sleeved on the outside of spool 3 and the both ends of second spring 52 and only supports 31 and first inertia of valve core head respectively
Block 51a.The left end of second spring 52 stops the right side for being against the first inertial mass 51a, and the right end of second spring 52 only supports valve core head 31.
Third spring 53 is sleeved on the outside of spool 3 and the both ends of third spring 53 and only supports 32 and first inertial mass of flange respectively
51a.The left end of third spring 53 stops the right side to flange 32, and the right end of third spring 53 stops the left side to the first inertial mass 51a.
As a result, as shown in Fig. 2, when spool 3 is moved to the left suddenly under gas pushing, the first inertial mass 51a is due to inertia
The opposite spool 3 of meeting moves right, and so as to compress second spring 52, spool 3 is hindered to be moved to the left in this way.And when gas pressure is unexpected
During reduction, spool 3 moves right under the pushing of the elastic force of the first spring 4, and the first inertial mass 51a is due to effect of inertia at this time
It can compress third spring 53, spool 3 is hindered to move to right, thus the first inertial mass 51a can decay the vibration frequency of spool 3, so as to
Reduce the noise that the vibrations of spool 3 generate.
It is appreciated that lubricant such as solid lubrication can be set between the first inertial mass 51a and the peripheral surface of spool 3
Agent, such first inertial mass 51a more smooth can undisturbedly be moved on spool 3, effectively reduce noise.Certainly, the present invention not
It is limited to this, in other embodiments of the invention, rolling has been may also set up between the first inertial mass 51a and the peripheral surface of spool 3
Pearl structure, for reducing friction of the two in relative movement, so as to reduce noise.
It is understood that second spring 52 and third spring 53 or other elastic components, as long as attenuation can be realized
The vibration frequency of spool 3 in the axial direction.
For example, according to one embodiment of present invention, as shown in Figure 1, inertial device 5 includes：Second inertial mass of annular
51b, the first elastic ring 54 and the second elastic ring 55.
Annular the second inertial mass 51b be slideably sleeved on the outside of spool 3 and be presented axially in valve core head 31 with it is convex
Between edge 32.First elastic ring 54 is sleeved on the outside of spool 3 and the first elastic ring 54 is compressed in 31 and second inertia of valve core head
Between block 51b.Second elastic ring 55 is sleeved on the outside of spool 3 and the second elastic ring 55 is compressed in 32 and second inertial mass of flange
Between 51b.
First elastic ring 54 and the second elastic ring 55 can buffer the vibration frequency of spool 3 in the axial direction, operation principle
Consistent with the above-mentioned operation principle using second spring 52 and third spring 53, which is not described herein again.
First elastic ring 54 and the second elastic ring 55 may be used the good material of elasticity and be made, such as the first elastic ring 54
Can be silica gel ring with the second elastic ring 55.
It is understood that inertial device 5 or other shapes and mode.As long as inertia member is located at valve core head 31
Between flange 32, and it can realize that vibration frequency, the reduction spool 3 of attenuation spool 3 in the axial direction shake and generate the used of noise
Property device 5 is both fallen in protection scope of the present invention.
According to one embodiment of present invention, which further includes filter device 6.Filter device 6 is located at valve body 1
It above and with import 111 connects, so that filtration, purification enters the gas of check valve 100, removes the impurity in gas, make gas more dry
It is net pure.
In the junction of valve body 1 and filter device 6, sealing device, such as O-ring seal 7a can be equipped with, to seal list
To valve 100, gas leakage is prevented.
According to one embodiment of present invention, the gas pressure range allowable of check valve 100 is：300KPa-600KPa.It changes
Yan Zhi, the working pressure range of check valve 100 is in 300KPa-600KPa.
Certainly, the present invention is not limited thereto, in other embodiments of the invention, the gas pressure model allowable of check valve 100
Also greater than 600KPa is enclosed, such as can be by strengthening valve body 1 and spool 3, increasing coefficient of elasticity of the first spring 4 etc. come real
It is existing.It is appreciated that the gas pressure range allowable of check valve 100 is also smaller than 300KPa.
Lung ventilator according to embodiments of the present invention is briefly described below.
Lung ventilator according to an embodiment of the invention includes check valve 100 according to the above embodiment of the present invention.
It is to be appreciated that the other component of lung ventilator according to an embodiment of the invention and its operation principle etc. have been existing
There is technology, and be well known for ordinary skill in the art, therefore be no longer described in detail one by one here.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ",
The description of " example ", " specific example " or " some examples " etc. means to combine specific features, the knot that the embodiment or example describe
Structure, material or feature are contained at least one embodiment of the present invention or example.In the present specification, to above-mentioned term
Schematic representation may not refer to the same embodiment or example.Moreover, specific features, structure, material or the spy of description
Point can in an appropriate manner combine in any one or more embodiments or example.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
In the case of being detached from the principle of the present invention and objective a variety of change, modification, replacement and modification can be carried out to these embodiments, this
The range of invention is limited by claim and its equivalent.
Claims (8)
1. a kind of check valve for lung ventilator, which is characterized in that including：
Valve body, the valve body is interior to have valve chamber, and the valve chamber has inlet and outlet；
Guide holder, the guide holder, which is located in the exit and the guide holder, has guide through hole；
Spool, the spool are located in the valve chamber, and the one end fits of the spool are in the guide through hole and the spool
Along the axially movable with along valve chamber described in the import towards the direction one-way conduction of the outlet, the valve of the valve body
Core includes insert body, and the nearer one end of import described in the distance of the insert body is provided with valve core head, the insert body
Peripheral surface on be provided with flange, the flange is separated from each other with the valve core head in the axial direction；
The spool is only only supported in first spring, one end of first spring to the guide holder and the other end；And
For the inertial device for the spool vibration frequency of decaying in the axial direction, the inertial device includes：
First inertial mass of annular, first inertial mass are slideably sleeved on the outside of the spool and upper in the axial direction
Between the valve core head and the flange；
Second spring, the second spring are sleeved on the outside of the spool and the both ends of the second spring and only support the valve respectively
Core print and first inertial mass；And
Third spring, the third spring pocket is in the outside of the spool and the both ends of the third spring are respectively only to described convex
Edge and first inertial mass.
2. the check valve according to claim 1 for lung ventilator, which is characterized in that the valve core head is feather valve core print
And the radial dimension edge of the valve core head is gradually increased from the import towards the direction of the outlet.
3. the check valve according to claim 1 for lung ventilator, which is characterized in that the radial dimension edge of the valve core head
Direction from the import towards the outlet gradually increases, and the elasticity that annular is provided on the peripheral surface of the valve core head is close
Seal.
4. the check valve according to claim 1 for lung ventilator, which is characterized in that the inertial device includes：
Second inertial mass of annular, second inertial mass are slideably sleeved on the outside of the spool and upper in the axial direction
Between the valve core head and the flange；
First elastic ring, first elastic ring is sleeved on the outside of the spool and first elastic ring is compressed in the valve
Between core print and second inertial mass；
Second elastic ring, second elastic ring is sleeved on the outside of the spool and second elastic ring be compressed in it is described convex
Between edge and second inertial mass.
5. the check valve according to claim 1 for lung ventilator, which is characterized in that the guide holder closes the outlet
And multiple channels are formed on the guide holder, the channel penetrates through the guide holder in the axial direction.
6. the check valve according to claim 1 for lung ventilator, which is characterized in that further include：Filter device, the mistake
Filter device be located on the valve body and with the inlet communication.
7. the check valve according to claim 1 for lung ventilator, which is characterized in that the gas pressure allowable of the check valve
Power is ranging from：300KPa-600KPa.
8. a kind of lung ventilator, which is characterized in that including being used for the unidirectional of lung ventilator according to any one of claim 1-7
Valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310215490.2A CN104208792B (en) | 2013-05-31 | 2013-05-31 | For the check valve of lung ventilator and with its lung ventilator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310215490.2A CN104208792B (en) | 2013-05-31 | 2013-05-31 | For the check valve of lung ventilator and with its lung ventilator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104208792A CN104208792A (en) | 2014-12-17 |
| CN104208792B true CN104208792B (en) | 2018-07-10 |
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ID=52090955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310215490.2A Active CN104208792B (en) | 2013-05-31 | 2013-05-31 | For the check valve of lung ventilator and with its lung ventilator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104208792B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB778884A (en) * | 1954-05-31 | 1957-07-10 | Anciens Ets Brisson | Improvements in and relating to valves |
| US3680587A (en) * | 1970-10-21 | 1972-08-01 | Deere & Co | Control valve member having vibration damping |
| GB1339898A (en) * | 1970-02-26 | 1973-12-05 | Parker D J | Control valve assembly for underwater breathing apparatus |
| US4257453A (en) * | 1979-04-06 | 1981-03-24 | Ruth L. Hesse | Peep valve with improved vibration damping |
| CN202236772U (en) * | 2011-09-28 | 2012-05-30 | 于邦仲 | Needle valve for pneumatic-control breathing machine |
| CN203315501U (en) * | 2013-05-31 | 2013-12-04 | 北京谊安医疗系统股份有限公司 | One-way valve for respirators and respirator comprising one-way valve |
-
2013
- 2013-05-31 CN CN201310215490.2A patent/CN104208792B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB778884A (en) * | 1954-05-31 | 1957-07-10 | Anciens Ets Brisson | Improvements in and relating to valves |
| GB1339898A (en) * | 1970-02-26 | 1973-12-05 | Parker D J | Control valve assembly for underwater breathing apparatus |
| US3680587A (en) * | 1970-10-21 | 1972-08-01 | Deere & Co | Control valve member having vibration damping |
| US4257453A (en) * | 1979-04-06 | 1981-03-24 | Ruth L. Hesse | Peep valve with improved vibration damping |
| CN202236772U (en) * | 2011-09-28 | 2012-05-30 | 于邦仲 | Needle valve for pneumatic-control breathing machine |
| CN203315501U (en) * | 2013-05-31 | 2013-12-04 | 北京谊安医疗系统股份有限公司 | One-way valve for respirators and respirator comprising one-way valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104208792A (en) | 2014-12-17 |
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