A new type of air-oxygen mixed gas circuit

Abstract

The invention discloses a novel air-oxygen mixed gas circuit, comprising: an oxygen branch, an air branch, and a mixed gas pipeline; a first bleed branch is arranged on the oxygen branch, and a second bleed branch is arranged at the rear end of the turbine of the air branch. When the oxygen branch outlet is output at a small flow rate, the oxygen inlet can still introduce oxygen with a higher flow rate, and the oxygen bleed is controlled by the first bleed branch and the first on-off valve. After the oxygen passes through the first bleed branch, a small flow oxygen flow is formed and output through the oxygen branch outlet, thereby realizing precise control of the oxygen concentration. When the required air volume is small, it is possible to introduce air with a higher flow rate at the air inlet and output air with a small flow rate at the air outlet. When the air output is almost zero, the technical effect that the turbine continues to operate without being damaged when the oxygen concentration is above 95% is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and more particularly to a novel air-oxygen mixed gas circuit. Background Art

[0002] High flow humidifier (HFNC) is a medical device that assists oxygen supply to patients. It has two outstanding features: constant flow and constant oxygen concentration. Because the output gas is a mixture of air and oxygen, the air and oxygen need to be mixed in the machine. High flow humidifiers generally use turbines as air pressurization devices. This pressurization device has better adaptability to the patient's pressure and flow conditions, is cheap and durable, and is very suitable for high flow humidification therapy products.

[0003] Currently, there are two ways of mixing air and oxygen in high-flow humidifiers:

[0004] First, air and oxygen are mixed and pressurized in the turbine; its products are represented by the famous Philips non-invasive ventilator V60. Oxygen enters the ventilator from a high-pressure gas cylinder, the flow is adjusted by a proportional valve, and then enters the turbine for standby through a flow meter; air is introduced from the atmosphere, passes through a filter and a flow meter and enters the turbine; air and oxygen are mixed and pressurized in the turbine, and then enter the subsequent device. This gas path design turbine not only has a pressurization function, but also powerfully mixes the gas.

[0005] Since air and oxygen are mixed in the turbine, in order to ensure that the oxygen concentration remains unchanged after mixing, the turbine must have antioxidant function and the materials used must be able to operate in oxygen-rich conditions, which greatly increases the cost of the product.

[0006] Second, the turbine is set on the air branch, and the air is pressurized by the turbine and then mixed with oxygen; taking Chinese patent CN105963837A-an air-oxygen mixing controlled ventilator and control method as an example, oxygen flows out from the high-pressure gas source, passes through the filter, proportional valve, and flow meter, and then enters the air-oxygen mixing chamber for standby; air is introduced from the atmosphere, passes through the filter, turbine, and flow meter, and then enters the air-oxygen mixing chamber to mix with air.

[0007] The air is pressurized by the turbine and then mixed with oxygen. The turbine does not need to have an anti-oxidation function, which greatly reduces the requirements for the turbine and can greatly reduce product costs. However, this gas circuit has a very big disadvantage: when the required oxygen concentration is 95-100%, the air output flow of the turbine is basically 0. However, in order to maintain the pressure at the rear end, the turbine must continue to run. In this state, the air flow does not flow out, and the turbine continues to run, which will generate more heat and damage the turbine. For this reason, the above gas circuit works for a long time at an oxygen concentration close to 100%, which will cause great damage to the machine.

[0008] In addition, the two gas circuits have a common disadvantage: under the state of small flow (including one or more of small flow of air branch, small flow of oxygen branch, and small flow of mixed pipeline), the oxygen concentration cannot be accurately controlled.

[0009] Therefore, how to provide a high-flow humidifier that fully or partially solves the above-mentioned technical problems is an issue that technical personnel in this field urgently need to solve. Summary of the invention

[0010] The present invention aims to solve one of the above-mentioned technical problems in the prior art at least to a certain extent.

[0011] To this end, an object of the present invention is to provide a novel air-oxygen mixing gas circuit, which can be used for an air-oxygen mixer and a high-flow humidifier, comprising:

[0012] An oxygen branch, wherein a first pressure sensor, a proportional valve and a first deflation branch are sequentially arranged on the oxygen branch along the direction from the oxygen inlet to the oxygen outlet; one end of the first deflation branch is connected to the oxygen branch, and the other end is a first deflation hole, and a first on-off valve is arranged on the first deflation branch;

[0013] An air branch, wherein a turbine, a second pressure sensor and a second air release branch are sequentially arranged along the direction from the air inlet to the air outlet of the air branch; one end of the second air release branch is connected to the air branch, and the other end is a second air release hole;

[0014] A mixed gas pipeline, wherein the oxygen branch and the air branch converge to one end of the mixed gas pipeline, and an outlet of the oxygen branch and an outlet of the air branch are communicated with the mixed gas pipeline.

[0015] The above oxygen inlet is generally connected to a high-pressure oxygen source, which can be connected to a high-pressure oxygen cylinder or a hospital wall oxygen. The high-pressure oxygen cylinder adjusts the pressure through the bottle mouth pressure regulating valve, which generally allows a higher pressure output. The hospital wall oxygen has a relatively low output pressure. Therefore, for the inlet pressure of the oxygen source, the system impact caused by pressure fluctuations must be considered. The inlet pressure design parameters are generally 0.2-0.7MPa, and the parameters are adjusted in combination with the medical device design standards and the actual use environment.

[0016] Furthermore, the second deflation branch is provided with a second on-off valve. When the second deflation branch is provided with an on-off valve, the diameter of the deflation pipeline can be designed to be slightly larger, and when the required air flow is small, the second on-off valve can be opened, and when the required air flow is large, the second on-off valve can be closed.

[0017] Furthermore, the second deflation hole is provided with a constant flow valve. When the second deflation branch is provided with a constant flow valve, no matter the introduced air is high pressure air or low pressure air, the deflation flow of the second deflation branch is relatively stable, and the deflation effect and flow control effect are better.

[0018] Furthermore, a first filter is provided on the oxygen branch between the oxygen inlet and the first pressure sensor, and a second filter is provided on the air branch between the air inlet and the second pressure sensor.

[0019] The first filter is mainly used to re-filter oxygen to ensure the normal operation of the equipment. The second filter is used to filter out larger dust particles in the air to prevent the valve from being stuck by dust and leaking. The filter's filtration accuracy must meet the requirements of the subsequent proportional valve and one-way valve. The filter's filtration effect directly affects the normal operation of the subsequent proportional valve and one-way valve.

[0020] The first pressure sensor is used to detect whether the pressure at the oxygen inlet is within the qualified parameters. At the same time, the first pressure sensor detects pressure data in real time to provide important parameters for the subsequent proportional valve flow regulation.

[0021] The function of the proportional valve is mainly to adjust the flow rate. According to the oxygen concentration set by the equipment parameters, the proportional valve refers to the air flow at the turbine end to match the flow rate required for the precise oxygen concentration.

[0022] Furthermore, a first flow stabilizer is provided between the first air release branch and the oxygen outlet, and a second flow stabilizer is provided between the second air release branch and the air outlet.

[0023] Furthermore, a first flow meter is provided between the first air release branch and the oxygen outlet, and a second flow meter is provided between the second air release branch and the air outlet.

[0024] Furthermore, the first flow meter includes: a throttling component, a measuring pipeline, a third on-off valve and a differential pressure sensor, the throttling component is arranged on the oxygen branch, both ends of the measuring pipeline are connected to the oxygen branch, and the differential pressure sensor is arranged on the measuring pipeline.

[0025] The flow stabilizer can be a porous medium, a section of pipe or even other flow stabilizers that can make the airflow uniform and stable. The oxygen and air passing through the flow stabilizer make it easier for the flow meter to measure more accurate results.

[0026] In the flow meter, the function of the throttling component is to change the airflow and generate a pressure difference related to the flow rate. The differential pressure sensor detects the pressure difference and inversely calculates the flow rate.

[0027] The differential pressure sensor uses a thermal flow sensor. This sensor has an airflow flowing through the sensor under the action of the pressure difference. The sensor calculates the pressure difference by sensing the temperature change. The differential pressure sensor measurement pipeline is equipped with a third on-off valve. Usually, after a period of operation, the zero point of the sensor is prone to fluctuations. In this case, small flow measurement will produce abnormal conditions. Therefore, after a period of operation, the device needs to be zeroed. During zeroing, the third on-off valve is closed to block a small airflow from passing through the sensor, and the sensor should be at zero. Read the digital signal value of the sensor, which is the new zero point. Then the third on-off valve is opened, and the device resumes normal operation. The on-off valve can be equipped with a self-locking valve with a position holding function, that is, whether it is kept open or closed, it does not need to consume electricity, and it can also be equipped with a normally open solenoid valve, so that it only needs to be closed and consumed electricity in a very short time of zeroing, and it is kept open on a daily basis. Preferably, the number of the third on-off valve is 0-2.

[0028] Furthermore, a first one-way valve is arranged near the oxygen outlet, and a second one-way valve is arranged near the air outlet.

[0029] The configuration of the one-way valve is mainly for the consideration of equipment reliability. When the equipment operating conditions are abnormal or the flow meter cannot detect the reverse flow, it prevents the flow at the air end from escaping from the oxygen path through the vent branch, causing inaccurate flow.

[0030] Furthermore, the mixed gas pipeline is provided with a third pressure sensor, a humidifier and a temperature sensor.

[0031] After the air and oxygen are mixed, the pressure is measured by the third pressure sensor, and the qualified and high-quality gas is delivered to the patient end through the air humidifier and temperature sensor.

[0032] Compared with the existing high-flow humidifier, the present invention has the following beneficial effects:

[0033] 1. When the oxygen branch outlet is a small flow output, the oxygen inlet can still introduce a higher flow of oxygen, and the oxygen release ratio is controlled by the first release branch and the first on-off valve. After the oxygen passes through the first release branch, a small flow of oxygen is formed and output through the oxygen branch outlet, thereby realizing precise control of the oxygen concentration.

[0034] 2. A second bleed branch is provided on the air branch. On the one hand, when the required air volume is small, a higher flow of air can be introduced into the air inlet, and a small flow of air can be output from the air outlet, thereby achieving the technical effect that the turbine continues to operate without being damaged when the oxygen concentration is above 95%. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0036] Figure 1 The accompanying drawing is a schematic diagram of the structure provided by the present invention.

[0037] Among them, 1-oxygen inlet, 2-oxygen outlet, 3-first pressure sensor, 4-proportional valve, 5-first venting branch, 6-first on-off valve, 7-air inlet, 8-air outlet, 9-second pressure sensor, 10-second venting branch, 11-first venting hole, 12-second venting hole, 13-mixed gas pipeline, 14-first filter, 15-second filter, 16-first stabilizer, 17-second stabilizer, 18-first flow meter, 1801-throttling assembly, 1802-measuring pipeline, 1803-third on-off valve, 1804-differential pressure sensor, 19-second flow meter, 20-first one-way valve, 21-second one-way valve, 22-third pressure sensor, 23-humidifier, 24-temperature sensor, 25-turbine. DETAILED DESCRIPTION

[0038] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0039] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] The embodiment of the present invention discloses a novel air-oxygen mixed gas circuit, comprising: an oxygen branch, on which a first pressure sensor 3, a proportional valve 4 and a first air release branch 5 are sequentially arranged along the direction from the oxygen inlet 1 to the oxygen outlet 2 of the oxygen branch; one end of the first air release branch 5 is connected to the oxygen branch, and the other end is a first air release hole 11, and a first on-off valve 6 is arranged on the first air release branch 5; an air branch, on which a turbine 25, a second pressure sensor 9 and a second air release branch 10 are sequentially arranged along the direction from the air inlet 7 to the air outlet 8 of the air branch; one end of the second air release branch 10 is connected to the air branch, and the other end is a second air release hole 12; a mixed gas pipeline 13, the oxygen branch and the air branch converge to one end of the mixed gas pipeline 13, and the outlet of the oxygen branch and the outlet of the air branch are connected to the mixed gas pipeline 13.

[0044] In some embodiments, the oxygen inlet 1 is generally connected to a high-pressure oxygen source, which can be connected to a high-pressure oxygen cylinder or a hospital wall oxygen. The inlet pressure design parameter is generally 0.2-0.7MPa, and the parameter is adjusted in combination with the medical device design standard and the actual use environment.

[0045] In some embodiments, a second on-off valve is provided on the second air release branch 10 or a constant flow valve is provided on the second air release hole 12 .

[0046] In some embodiments, a first filter 14 is disposed on the oxygen branch between the oxygen inlet 1 and the first pressure sensor 3 , and a second filter 15 is disposed on the air branch between the air inlet 7 and the second pressure sensor 9 .

[0047] In some embodiments, a first flow stabilizer 16 is disposed between the first air release branch 5 and the oxygen outlet 2 , and a second flow stabilizer 17 is disposed between the second air release branch 10 and the air outlet 8 .

[0048] In some embodiments, a first flow meter 18 is provided between the first deflation branch 5 and the oxygen outlet 2 , and a second flow meter 19 is provided between the second deflation branch 10 and the air outlet 8 .

[0049] In some embodiments, the first flow meter 18 includes: a throttling component 1801, a measuring pipeline 1802, a third on-off valve 1803 and a differential pressure sensor 1804, the throttling component 1801 is arranged on the oxygen branch, both ends of the measuring pipeline 1802 are connected to the oxygen branch, the differential pressure sensor 1804 is arranged on the measuring pipeline 1802, and the number of the third on-off valve 1803 is preferably 0-2.

[0050] In some embodiments, a first one-way valve 20 is disposed near the oxygen outlet 2 , and a second one-way valve 21 is disposed near the air outlet 8 .

[0051] In some embodiments, a third pressure sensor 22 , a humidifier 23 and a temperature sensor 24 are disposed on the mixed gas pipeline 13 .

[0052] The specific working process is as follows:

[0053] ①Oxygen branch

[0054] Oxygen enters the oxygen inlet 1 from the high-pressure gas source, and then passes through the first filter 14, the first pressure sensor 3 and the proportional valve 4 in sequence, filtering the oxygen, measuring the pressure and matching the precise flow rate according to the preset oxygen concentration;

[0055] Then the oxygen is split, and a part of it enters the first venting branch 5. When the parameters set by the equipment require the oxygen branch to provide a smaller flow rate, and according to this setting, the proportional valve 4 cannot provide higher accuracy and abnormal working range, the first on-off valve 6 is opened, and part of the oxygen is discharged from the first venting hole 11; when the parameters set by the equipment require the oxygen branch to provide a larger flow rate or a normal flow rate, the first on-off valve 6 is closed, and the first venting branch 5 is closed. The other part continues to flow along the conventional oxygen branch to the first flow stabilizer 16, and then passes through the first flowmeter 18 and the first one-way valve 20 in turn, and converges from the oxygen outlet 2 to the mixed gas pipeline 13.

[0056] ② Air branch

[0057] Air is introduced from the atmosphere into the air inlet 7, and then passes through the second filter 15 and the turbine 25 in sequence, filtering and pressurizing the air;

[0058] The air is then diverted. When the parameters set by the equipment require the air branch to provide a smaller flow rate, the turbine 25 continues to operate and provide normal air flow. Part of the air enters the second vent branch 10 and is discharged into the atmosphere through the second vent hole 12, and the other part flows along the conventional air branch pipeline to the second flow stabilizer 17, and then passes through the second flow meter 19 and the second one-way valve 21 in turn, and converges from the air outlet 8 to the mixed gas pipeline 13.

[0059] ③Mixed gas pipeline 13

[0060] After the air and oxygen merge, they flow together to the outlet of the mixed gas pipeline 13, that is, the end supplied to the patient, and pass through the third pressure sensor 22, the humidifier 23 and the temperature sensor 24 in sequence. In the process of flowing to the patient supply end, the air and oxygen are fully mixed to reach the preset oxygen ratio.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0062] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A new type of air-oxygen mixed gas circuit, characterized in that: include: An oxygen branch, wherein a first pressure sensor (3), a proportional valve (4) and a first air release branch (5) are sequentially arranged on the oxygen branch along the direction from the oxygen inlet (1) to the oxygen outlet (2); one end of the first air release branch (5) is connected to the oxygen branch, and the other end is a first air release hole (11); and a first on-off valve (6) is arranged on the first air release branch (5); An air branch, wherein a turbine (25), a second pressure sensor (9) and a second air release branch (10) are sequentially arranged on the air branch along a direction from an air inlet (7) to an air outlet (8); one end of the second air release branch (10) is connected to the air branch, and the other end is a second air release hole (12); A mixed gas pipeline (13), wherein the oxygen branch and the air branch converge at one end of the mixed gas pipeline (13), and the outlet of the oxygen branch and the outlet of the air branch are both in communication with the mixed gas pipeline (13); The second air release branch (10) is provided with a second on-off valve; The second air release hole (12) is provided with a constant flow valve; A first flow meter (18) is provided between the first deflation branch (5) and the oxygen outlet (2), and a second flow meter (19) is provided between the second deflation branch (10) and the air outlet (8); The first flow meter (18) comprises: a throttling component (1801), a measuring pipeline (1802), a third on-off valve (1803) and a differential pressure sensor (1804); the throttling component (1801) is arranged on the oxygen branch, both ends of the measuring pipeline (1802) are connected to the oxygen branch, and the differential pressure sensor (1804) is arranged on the measuring pipeline (1802).

2. A novel air-oxygen mixed gas circuit according to claim 1, characterized in that: A first filter (14) is provided on the oxygen branch between the oxygen inlet (1) and the first pressure sensor (3), and a second filter (15) is provided on the air branch between the air inlet (7) and the second pressure sensor (9).

3. A novel air-oxygen mixed gas circuit according to claim 1, characterized in that: A first flow stabilizer (16) is provided between the first air release branch (5) and the oxygen outlet (2), and a second flow stabilizer (17) is provided between the second air release branch (10) and the air outlet (8).

4. A novel air-oxygen mixed gas circuit according to claim 1, characterized in that: The number of the third on-off valves (1803) is 2.

5. The novel air-oxygen mixed gas circuit according to claim 1 is characterized in that: A first one-way valve (20) is arranged near the oxygen outlet (2), and a second one-way valve (21) is arranged near the air outlet (8).

6. A novel air-oxygen mixed gas circuit according to any one of claims 1 to 5, characterized in that: The mixed gas pipeline (13) is provided with a third pressure sensor (22), a humidifier (23) and a temperature sensor (24).

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