CN110522982B - Single-input double-output gas flow regulating device - Google Patents
Single-input double-output gas flow regulating device Download PDFInfo
- Publication number
- CN110522982B CN110522982B CN201910917670.2A CN201910917670A CN110522982B CN 110522982 B CN110522982 B CN 110522982B CN 201910917670 A CN201910917670 A CN 201910917670A CN 110522982 B CN110522982 B CN 110522982B
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- Prior art keywords
- oxygen
- valve needle
- round table
- valve
- valve body
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 17
- 239000001301 oxygen Substances 0.000 claims abstract description 149
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 149
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 139
- 239000007789 gas Substances 0.000 claims abstract description 51
- 238000007789 sealing Methods 0.000 claims abstract description 16
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 5
- 229910001882 dioxygen Inorganic materials 0.000 claims description 2
- 230000008676 import Effects 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 3
- 230000029058 respiratory gaseous exchange Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 1
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
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/20—Valves specially adapted to medical respiratory devices
- A61M16/201—Controlled 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
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/20—Valves specially adapted to medical respiratory devices
- A61M16/201—Controlled valves
- A61M16/202—Controlled valves electrically actuated
- A61M16/203—Proportional
- A61M16/204—Proportional used for inhalation control
Landscapes
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Pulmonology (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Lift Valve (AREA)
- Multiple-Way Valves (AREA)
Abstract
The invention discloses a single-input double-output gas flow regulating device, wherein one end of a valve body is provided with an inner valve body oxygen inlet, the inner side of the other end of the valve body is provided with valve body regulating threads, an oxygen inlet of the valve body, an oxygen input channel, a first oxygen cavity and a second oxygen cavity are communicated to form a cavity, a first oxygen outlet is communicated with the first oxygen cavity, and a second oxygen outlet is communicated with the second oxygen cavity; the valve needle second round table, the valve needle third round table and the valve needle fourth round table are arranged in the first oxygen cavity and correspond to the first oxygen outlet; the valve needle fifth round table is arranged in the second oxygen cavity and corresponds to the second oxygen outlet; the valve needle adjusting thread is matched with the valve body adjusting thread; the middle part of the valve needle is provided with a sealing ring fixing groove, and a sealing ring is arranged in the sealing ring fixing groove. The output gas flow of the two output ports is proportional and cannot change due to the mutual matching problem, so that raw materials are saved, and the installation space is saved.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to a single-input double-output gas flow regulating device.
Background
Among the prior art, the flow control device of breathing machine adopts single input single output more, and the size of output is adjusted through the needle, like CN2503911 discloses breathing machine spiral flow control valve, belongs to the governing valve for gas or liquid control, especially the governing valve for breathing machine, includes: the stepping motor contacts with the valve body seat through the valve body, and the valve body seat is provided with a gas or liquid inlet and a gas or liquid outlet. When two output quantities are needed to be in proportion, the two regulating valve needles can not meet the requirement when being independently regulated respectively, the two valve bodies are integrally designed, the two valve needles are connected through gears, one valve needle is regulated, the other valve needle is linked, and the effect of simultaneous regulation is achieved, for example, CN102793959B discloses a ventilator gas circuit system for stabilizing air-oxygen mixed tidal volume. The device comprises a switching valve, a sequence valve, a linkage flow regulating valve, a venturi tube and other parts, wherein the flow regulation of a first needle valve and the flow regulation of a second needle valve in the linkage flow regulating valve are arranged in a linkage mode according to a set proportion, so that when the breathing machine is switched to an air-oxygen mixing state, the inhaled gas flow in the venturi tube is equal to the gas flow output by the second needle valve in a pure oxygen state of the breathing machine. But still two valve bodies, two valve needles, two inputs and two outputs, the output ratio will change continuously if the linkage fit of the two valve needles is not very good.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a valve which only uses one valve needle and one valve body, and the output gas flow of two output ports is proportional and can not change due to the mutual matching problem, so that the raw materials and the installation space of equipment comprising the device are saved.
The aim of the invention is achieved by the following technical scheme.
The single-input double-output gas flow regulating device comprises a valve body and a valve needle, wherein the valve needle is arranged in the valve body, one end of the valve body is provided with a valve body oxygen inlet, the inner side of the other end of the valve body is provided with a valve body regulating thread, the valve body oxygen inlet is communicated with an oxygen input channel, the oxygen input channel is communicated with a first oxygen cavity, the first oxygen cavity is communicated with a second oxygen cavity, the side surface of the valve body is provided with a first oxygen outlet and a second oxygen outlet, the first oxygen outlet is communicated with the first oxygen cavity, and the second oxygen outlet is communicated with the second oxygen cavity; the valve needle is sequentially provided with a valve needle second round table, a valve needle third round table, a valve needle fourth round table, a valve needle fifth round table, a sealing ring fixing groove and valve needle adjusting threads; the valve needle second round table, the valve needle third round table and the valve needle fourth round table are arranged in the first oxygen cavity and correspond to the first oxygen outlet; the valve needle fifth round table is arranged in the second oxygen cavity and corresponds to the second oxygen outlet; the valve needle adjusting thread is arranged on the outer side of the middle upper part of the valve needle and is matched with the valve body adjusting thread; the valve needle middle part is equipped with the sealing washer fixed slot, install the sealing washer in the sealing washer fixed slot.
The diameter of the upper bottom surface of the valve needle fifth round table is larger than that of the lower bottom surface, and the lower bottom surface of the valve needle fifth round table is connected with the upper bottom surface of the valve needle fourth round table; the lower bottom surface of the valve needle fourth round table is equal to and connected with the upper bottom surface of the valve needle third round table, the diameter of the upper bottom surface of the valve needle fourth round table is smaller than that of the lower bottom surface, the diameter of the lower bottom surface of the valve needle third round table is smaller than that of the upper bottom surface, and the lower bottom surface of the valve needle third round table is equal to and connected with the upper bottom surface of the valve needle second round table.
The lower bottom surface of the valve needle second round platform is equal to and connected with the upper bottom surface of the valve needle first round platform, and the valve needle first round platform is used for guiding the valve needle and plugging into an oxygen input channel.
The gas output of the first oxygen outlet is 2.28-2.31 times of the gas output of the second oxygen outlet.
The diameters of the upper bottom surface of the second circular table of the valve needle and the lower bottom surface of the third circular table of the valve needle areThe diameters of the upper bottom surface of the third circular table of the valve needle and the lower bottom surface of the fourth circular table of the valve needle are +.>The diameter of the upper bottom surface of the fourth round table of the valve needle is +.>The diameter of the upper bottom surface of the valve needle fifth round table is +.>The diameter of the lower bottom surface of the valve needle fifth round table is +.>
The diameters of the first oxygen outlet and the second oxygen outlet on the valve body are the same; the diameter of the oxygen input channel on the valve body isThe diameter of the first oxygen cavity is +.>The diameter of the second oxygen cavity is +.>
When the oxygen concentration of the output air-oxygen mixed gas is between 40% and 50%, the gas output of the first oxygen outlet is between 1.71 and 3.17 times of the gas output of the second oxygen outlet.
Compared with the prior art, the invention has the advantages that: two or more than two adjusting devices can be combined into one adjusting device, so that raw materials are saved, and the installation space of equipment comprising the adjusting device is saved; and meanwhile, the output proportion is not changed due to the mutual matching problem.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1-valve body 2-valve needle 3-valve body oxygen inlet 4-oxygen input channel 5-first oxygen cavity 6-first oxygen outlet 7-second oxygen cavity 8-second oxygen outlet 9-valve body adjusting screw thread 10-valve needle first round table 11-valve needle second round table 12-valve needle third round table 13-valve needle fourth round table 14-valve needle fifth round table 15-sealing ring fixing groove 16-valve needle adjusting screw thread.
Detailed Description
The invention will now be described in detail with reference to the drawings and the accompanying specific examples.
As shown in fig. 1, the single-input double-output gas flow regulating device comprises a valve body 1 and a valve needle 2, wherein the valve needle 2 is arranged in the valve body 1, one end of the valve body 1 is provided with a valve body oxygen inlet 3, the inner side of the other end of the valve body 1 is provided with a valve body regulating thread 9, the valve body oxygen inlet 3 is communicated with an oxygen input channel 4, the oxygen input channel 4 is communicated with a first oxygen cavity 5, the first oxygen cavity 5 is communicated with a second oxygen cavity 7, the side surface of the valve body 1 is provided with a first oxygen outlet 6 and a second oxygen outlet 8, the first oxygen outlet 6 is communicated with the first oxygen cavity 5, and the second oxygen outlet 8 is communicated with the second oxygen cavity 7; the valve needle 2 is sequentially provided with a valve needle second circular truncated cone 11, a valve needle third circular truncated cone 12, a valve needle fourth circular truncated cone 13, a valve needle fifth circular truncated cone 14, a sealing ring fixing groove 15 and a valve needle adjusting thread 16; the valve needle second round table 11, the valve needle third round table 12 and the valve needle fourth round table 13 are arranged in the first oxygen cavity 5 and correspond to the first oxygen outlet 6; the valve needle fifth round table 14 is arranged in the second oxygen cavity 7 and corresponds to the second oxygen outlet 8; the valve needle adjusting screw thread 16 is arranged on the outer side of the middle upper part of the valve needle 2, the valve needle adjusting screw thread 16 is in threaded fit with the valve body adjusting screw thread 9, and the oxygen inlet amount can be adjusted from 0 to the designed maximum value by fixing the valve body 1 and rotating the valve needle 2. A sealing ring fixing groove 15 is formed in the middle of the valve needle 2, and a sealing ring is arranged in the sealing ring fixing groove 15; avoiding leakage of oxygen from the adjusting thread 16 in the gap between the valve body 1 and the valve needle 2.
The diameter of the upper bottom surface of the valve needle fifth round table 14 is larger than that of the lower bottom surface, and the lower bottom surface of the valve needle fifth round table 14 is connected with the upper bottom surface of the valve needle fourth round table 13; the lower bottom surface of the valve needle fourth round table 13 is equal to and connected with the upper bottom surface of the valve needle third round table 12, the diameter of the upper bottom surface of the valve needle fourth round table 13 is smaller than that of the lower bottom surface, the diameter of the lower bottom surface of the valve needle third round table 12 is smaller than that of the upper bottom surface, and the lower bottom surface of the valve needle third round table 12 is equal to and connected with the upper bottom surface of the valve needle second round table 11.
The lower bottom surface of the valve needle second round table 11 is equal to and connected with the upper bottom surface of the valve needle first round table 10, the valve needle first round table 10 is used for guiding the valve needle and plugging into an oxygen input channel, and the valve needle second round table 11 and the third round table 12 can completely block the oxygen input channel 4 on the valve body 1 when needed, and no oxygen can pass through the oxygen input channel.
The gas output of the first oxygen outlet 6 is 2.28-2.31 times the gas output of the second oxygen outlet 8. When the ventilator is used in emergency treatment, the input oxygen is considered to be 100% pure oxygen, the oxygen content in the air is 21%, the oxygen content in the air-oxygen mixed gas after Venturi is 45% (which is determined when Venturi is designed), the cooperation between the relevant sizes of the ventilator ensures that the gas output of the first oxygen outlet 6 is 2.28-2.31 times of the gas output of the second oxygen outlet 8, and the ratio can completely meet the use requirement.
The diameters of the upper bottom surface of the valve needle second round table 11 and the lower bottom surface of the valve needle third round table 12 are as followsThe diameters of the upper bottom surface of the valve needle third round table 12 and the lower bottom surface of the valve needle fourth round table 13 are +.>The diameter of the upper bottom surface of the valve needle fourth round table 13 is +.>The diameter of the upper bottom surface of the valve needle fifth round table 14 isThe diameter of the lower bottom surface of the valve needle fifth round table 14 is +.>
The diameters of a first oxygen outlet 6 and a second oxygen outlet 8 on the valve body 1 are the same; the diameter of the oxygen input channel 4 on the valve body 1 isThe diameter of the first oxygen chamber 5 is +.>The diameter of the second oxygen chamber 7 is +.>
The cooperation of the first round table 10 of the valve needle, the second round table 11 of the valve needle and the third round table 12 of the valve needle controls the air inflow of oxygen entering the first oxygen cavity 5 and the second oxygen cavity 7 from the oxygen input channel 4, and the cooperation of the third round table 12 of the valve needle, the fourth round table 13 of the valve needle and the fifth round table 14 of the valve needle (the diameter of the upper round table and the diameter and the height of the lower round table) enables the oxygen entering the valve body from the oxygen input channel 4 to enter the first oxygen cavity 5 and the second oxygen cavity 7, so that the gas output of the first oxygen outlet 6 is 2.28-2.31 times of the gas output of the second oxygen outlet 8 through the first oxygen outlet 6 and the second oxygen outlet 8 according to a preset proportion.
The invention is applied to an emergency breathing machine, and air-oxygen mixing adopts a Venturi device, and mainly aims to output air-oxygen mixed gas with set tidal volume when the air-oxygen mixed gas is needed, and directly output pure oxygen gas with equal tidal volume through a valve rocker switch without readjusting when the air-oxygen mixed gas is needed to be pure oxygen.
The second oxygen outlet 8 of the valve body 1 is connected with the venturi nozzle, the venturi air suction inlet is connected with the pneumatic control switch valve, the pneumatic control switch valve gas inlet is connected with the pneumatic valve gas outlet, the first oxygen outlet 6 is connected with the pneumatic valve gas inlet, the pneumatic valve is controlled by the valve rocker arm, in the structure, the second oxygen outlet 8 is input into the oxygen of the venturi nozzle, and according to the venturi effect, the air quantity sucked by the venturi air suction inlet through the pneumatic control switch valve is equivalent to the oxygen output by the first oxygen outlet 6. Thus, the output tidal volume is not changed when the two output gases are converted.
When the oxygen concentration of the output mixed gas is 40%, the gas output quantity of the first oxygen outlet 6 is 3.15-3.17 times of that of the second oxygen outlet 8; when the oxygen concentration of the output mixed gas is 45%, the gas output quantity of the first oxygen outlet 6 is 2.28-2.31 times of that of the second oxygen outlet 8; when the oxygen concentration of the output mixed gas is 50%, the gas output of the first oxygen outlet 6 is 1.71 to 1.74 times the gas output of the second oxygen outlet 8.
Claims (7)
1. The utility model provides a single-input double-output gas flow regulating device, includes valve body (1) and needle (2), in valve needle (2) locates valve body (1), its characterized in that valve body (1) one end is provided with valve body oxygen import (3), the other end inboard of valve body (1) is provided with valve body adjusting screw thread (9), valve body oxygen air inlet (3) are linked together with oxygen input channel (4), oxygen input channel (4) are linked together with first oxygen chamber (5), first oxygen chamber (5) are linked together with second oxygen chamber (7), valve body (1) side is provided with first oxygen export (6) and second oxygen export (8), first oxygen export (6) are linked together with first oxygen chamber (5), second oxygen export (8) are linked together with second oxygen chamber (7). The valve needle (2) is sequentially provided with a valve needle second round table (11), a valve needle third round table (12), a valve needle fourth round table (13), a valve needle fifth round table (14), a sealing ring fixing groove (15) and a valve needle adjusting thread (16); the valve needle second round table (11), the valve needle third round table (12) and the valve needle fourth round table (13) are arranged in the first oxygen cavity (5) and correspond to the first oxygen outlet (6); the valve needle fifth round table (14) is arranged in the second oxygen cavity (7) and corresponds to the second oxygen outlet (8); the outer side of the middle upper part of the valve needle (2) is provided with a valve needle adjusting thread (16), and the valve needle adjusting thread (16) is in threaded fit with the valve body adjusting thread (9); the middle part of valve needle (2) is equipped with sealing washer fixed slot (15), install the sealing washer in sealing washer fixed slot (15), second oxygen export (8) link to each other with venturi's nozzle and are used for exporting the empty oxygen mixed gas of setting for the tidal volume, and first oxygen export (6) link to each other with pneumatic valve air inlet and are used for exporting the pure oxygen gas of setting for tidal volume etc..
2. A single-input double-output gas flow regulating device according to claim 1, characterized in that the diameter of the upper bottom surface of the valve needle fifth round table (14) is larger than the diameter of the lower bottom surface, and the lower bottom surface of the valve needle fifth round table (14) is connected with the upper bottom surface of the valve needle fourth round table (13); the lower bottom surface of the valve needle fourth round table (13) is equal to and connected with the upper bottom surface of the valve needle third round table (12), the diameter of the upper bottom surface of the valve needle fourth round table (13) is smaller than that of the lower bottom surface, the diameter of the lower bottom surface of the valve needle third round table (12) is smaller than that of the upper bottom surface, and the lower bottom surface of the valve needle third round table (12) is equal to and connected with the upper bottom surface of the valve needle second round table (11).
3. A single input double output gas flow regulator according to claim 1 or 2, characterized in that the lower bottom surface of the second land (11) of the valve needle is equal to and connected to the upper bottom surface of the first land (10) of the valve needle, said first land (10) of the valve needle being adapted to guide the valve needle and to plug into the oxygen inlet channel.
4. A single input, double output gas flow regulator according to claim 3, characterized in that the gas output of the first oxygen outlet (6) is 2.28-2.31 times the gas output of the second oxygen outlet (8).
5. The single-input double-output gas flow regulating device according to claim 4, wherein the diameters of the upper bottom surface of the valve needle second round table (11) and the lower bottom surface of the valve needle third round table (12) are phi 4.03+/-0.02 mm, the diameters of the upper bottom surface of the valve needle third round table (12) and the lower bottom surface of the valve needle fourth round table (13) are phi 4.34+/-0.02 mm, the diameter of the upper bottom surface of the valve needle fourth round table (13) is phi 4.00+/-0.02 mm, the diameter of the upper bottom surface of the valve needle fifth round table (14) is phi 5.24+/-0.02 mm, and the diameter of the lower bottom surface of the valve needle fifth round table (14) is phi 4.96+/-0.02 mm.
6. A single input double output gas flow regulator according to claim 4 or 5, characterized in that the first oxygen outlet (6) and the second oxygen outlet (8) on the valve body (1) are of the same diameter; the diameter of the oxygen input channel (4) on the valve body (1) is phi 4.05+/-0.02 mm, the diameter of the first oxygen cavity (5) is phi 5.00+/-0.02 mm, and the diameter of the second oxygen cavity (7) is phi 8.00+/-0.02 mm.
7. A single input double output gas flow regulator according to claim 3, characterized in that the gas output of the first oxygen outlet (6) is between 1.71 and 3.17 times the gas output of the second oxygen outlet (8) when the oxygen concentration of the output air-oxygen mixture is between 40% and 50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910917670.2A CN110522982B (en) | 2019-09-26 | 2019-09-26 | Single-input double-output gas flow regulating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910917670.2A CN110522982B (en) | 2019-09-26 | 2019-09-26 | Single-input double-output gas flow regulating device |
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| Publication Number | Publication Date |
|---|---|
| CN110522982A CN110522982A (en) | 2019-12-03 |
| CN110522982B true CN110522982B (en) | 2024-02-20 |
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| CN201910917670.2A Active CN110522982B (en) | 2019-09-26 | 2019-09-26 | Single-input double-output gas flow regulating device |
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|---|---|---|---|---|
| CN1184226A (en) * | 1996-07-25 | 1998-06-10 | 库珀工业公司 | Torch valve assembly |
| WO2000014414A1 (en) * | 1998-09-09 | 2000-03-16 | Robert Bosch Gmbh | Pulse-actuated pneumatic 4/2 directional valve |
| CN200991483Y (en) * | 2006-12-26 | 2007-12-19 | 北京谊安医疗系统股份有限公司 | Venturi mode oxygen-concentration compensation device |
| CN101468224A (en) * | 2007-12-29 | 2009-07-01 | 北京谊安医疗系统股份有限公司 | Flow regulating and controlling valve |
| CN101915183A (en) * | 2010-07-01 | 2010-12-15 | 北京航空航天大学 | Double-working-condition stepped flow control valve and design method of control structure thereof |
| CN201875167U (en) * | 2010-10-20 | 2011-06-22 | 北京航天计量测试技术研究所 | Air inlet regulating valve with current-stabilizing constant-current characteristic |
| CN103495254A (en) * | 2013-09-25 | 2014-01-08 | 泰州市久信医疗科技有限公司 | Needle valve used for breathing machine |
| CN104984455A (en) * | 2015-08-10 | 2015-10-21 | 陈思 | High-precision medical air and oxygen mixer |
| CN207315762U (en) * | 2017-09-01 | 2018-05-04 | 河北华春液压汽配有限公司 | Pressure control type oil circuit automatic transfer valve |
| CN211751678U (en) * | 2019-09-26 | 2020-10-27 | 泰州市久信医疗科技有限公司 | Single-input double-output gas flow regulating device |
-
2019
- 2019-09-26 CN CN201910917670.2A patent/CN110522982B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1184226A (en) * | 1996-07-25 | 1998-06-10 | 库珀工业公司 | Torch valve assembly |
| WO2000014414A1 (en) * | 1998-09-09 | 2000-03-16 | Robert Bosch Gmbh | Pulse-actuated pneumatic 4/2 directional valve |
| EP1042616A1 (en) * | 1998-09-09 | 2000-10-11 | Robert Bosch Gmbh | Pulse-actuated pneumatic 4/2 directional valve |
| CN200991483Y (en) * | 2006-12-26 | 2007-12-19 | 北京谊安医疗系统股份有限公司 | Venturi mode oxygen-concentration compensation device |
| CN101468224A (en) * | 2007-12-29 | 2009-07-01 | 北京谊安医疗系统股份有限公司 | Flow regulating and controlling valve |
| CN101915183A (en) * | 2010-07-01 | 2010-12-15 | 北京航空航天大学 | Double-working-condition stepped flow control valve and design method of control structure thereof |
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| CN103495254A (en) * | 2013-09-25 | 2014-01-08 | 泰州市久信医疗科技有限公司 | Needle valve used for breathing machine |
| CN104984455A (en) * | 2015-08-10 | 2015-10-21 | 陈思 | High-precision medical air and oxygen mixer |
| CN207315762U (en) * | 2017-09-01 | 2018-05-04 | 河北华春液压汽配有限公司 | Pressure control type oil circuit automatic transfer valve |
| CN211751678U (en) * | 2019-09-26 | 2020-10-27 | 泰州市久信医疗科技有限公司 | Single-input double-output gas flow regulating device |
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| CN110522982A (en) | 2019-12-03 |
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