Oxygen generator and oxygen generator high-flow output method

Abstract

The invention relates to the field of oxygen generators, in particular to a high-flow oxygen generator and a high-flow output method of the oxygen generator. The output method comprises the following steps: constructing an oxygen generation unit and an air branch connected in parallel with the oxygen generation unit between an air input end and an oxygen output end; and the flow control unit is used for distributing part of air supplied by the air input end to the air branch and regulating and controlling the air flowing through the air branch, so that the air is mixed with oxygen generated by the oxygen generation unit to form air-oxygen mixed gas, and the air-oxygen mixed gas is output at a flow value meeting the expectation of a user. The oxygen generator comprises an air compressor, an oxygen generation unit and an output pipeline; the downstream end of the air compressor is connected with the oxygen generation unit, and the downstream end of the oxygen generation unit is connected with the output pipeline; one end of the air pipeline is connected with the downstream end of the air compressor, and the other end of the air pipeline is connected with the upstream end of the output pipeline; an air flow adjusting unit is arranged on the air branch and used for adjusting the flow of air flowing through the air branch.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oxygen generator, in particular to high flow oxygen generator and oxygen generator high flow output method. BACKGROUND

[0002] Nasal high flow humidified oxygen therapy (HFNC) is a new type of respiratory support technology, which is widely used in the treatment of hypoxemic respiratory failure in clinical practice. This technology requires a constant oxygen concentration of high flow gas provided by an air-oxygen mixing device, and the appropriate temperature and humidity of the gas is ensured by a humidification therapy instrument. There are two main schemes to achieve this function at present: One is a modular combined system, which is composed of multiple independent devices in series, usually including an external high-pressure oxygen source (such as an oxygen cylinder or a central oxygen supply system), a medical air compressor, an independent air-oxygen mixer, a flow meter, a humidification therapy instrument, and connecting pipelines. The advantage of this scheme is that each module can be flexibly selected and matched, and some components can be reused. However, its disadvantages are extremely prominent: low system integration, resulting in a large number of devices, large floor area, complex wiring, and extremely inconvenient movement; deployment and operation process is complicated, requiring high requirements for medical staff; compatibility and air tightness between multiple device interfaces can easily lead to leakage or unstable performance; overall maintenance cost is high, and there are multiple failure points, with relatively low system reliability.

[0003] The second is an integrated high flow humidification instrument, which highly integrates air compression, air-oxygen mixing, flow control, and temperature and humidity into a single device, making operation simple, appearance neat, and mobility relatively good. However, the core technology threshold and manufacturing cost are high, resulting in high equipment prices, which limits its popularity in primary medical institutions and home users. In addition, when an external oxygen generator is needed as an oxygen source, the output pressure, flow range, and interface standards of the two devices often do not match, causing collaborative work failure, affecting treatment effectiveness and device safety.

[0004] In the above-mentioned schemes, a medical molecular sieve oxygen generator is often selected as an oxygen source, which is widely used in home oxygen therapy and primary medical care due to its low cost, simple operation, and easy maintenance, and has become a basic device in the field of respiratory therapy. However, the traditional medical molecular sieve oxygen generator can only provide low flow oxygen output and cannot directly meet the high flow mixed gas output requirements of HFNC, which limits its direct application in high-efficiency oxygen therapy scenarios. SUMMARY

[0005] The present application aims to provide an oxygen generator high flow output method, an oxygen generator design method, and a concentration adjustment method to solve the problem of low oxygen output flow in the prior art.

[0006] The technical solution of the present invention is: a high flow output method for an oxygen generator, wherein an oxygen generating unit and an air branch connected in parallel with the oxygen generating unit are constructed between the air input end and the oxygen output end; A portion of the air supplied by the air input terminal is diverted to the air branch, and the air flowing through the air branch is regulated to mix with the oxygen generated by the oxygen generation unit to form an air-oxygen mixture, which is then output at a flow rate that meets the user's expectations.

[0007] A high-flow oxygen generator includes an air compressor, an oxygen generation unit, and an output pipeline; The downstream end of the air compressor is connected to the oxygen generating unit, and the downstream end of the oxygen generating unit is connected to the output pipeline. An air branch is also provided, one end of which is connected to the downstream end of the air compressor, and the other end is connected to the upstream end of the output pipe; An air flow regulation unit is provided on the air branch to regulate the flow rate of the air flowing through the air branch.

[0008] Preferably, the air flow regulating unit includes an air pressure regulator and an air flow controller.

[0009] Preferably, the airflow regulating unit includes a buffer disposed upstream of the air pressure regulator.

[0010] Preferably, the airflow regulating unit includes an airflow feedback sensor, and the airflow controller, the airflow feedback sensor and a controller are electrically connected to form a closed-loop flow control system.

[0011] Preferred settings: The maximum airflow rate that the air compressor can provide is A1; The oxygen generating unit can produce oxygen with an oxygen content of C1 and a flow rate of B1. The oxygen content D1 and flow rate E in the produced air-oxygen mixture then satisfy the following conditions: ; .

[0012] Preferably, the air flow controller includes a flow-blocking component, which has a through hole with a fixed opening, so that the flow-blocking component has a flow area A for air to pass through; The setpoint P of the air pressure regulator is determined by the following method: Calculate the difference P between the maximum absolute pressure of the air compressor and the fluctuation range of the adsorption pressure of the oxygen generation module. C ; The classical spray theory-derived value of 0.528 is compared with the stated P. CCompare the ratio with the standard atmospheric pressure P2; when At that time, the subcritical throttling flow rate formula for high-pressure gas is used. P1 is calculated, and P = P1 - P2.

[0013] Preferably, multiple flow-blocking components are connected in parallel.

[0014] Preferably, the oxygen concentration of the final output mixed gas is adjusted by regulating the output flow ratio of the air branch and the oxygen generating unit; Among them, while keeping the total output flow rate constant, the flow rate of the air branch is increased and the flow rate of the oxygen generating unit is reduced accordingly to decrease the output oxygen concentration, or the flow rate of the air branch is reduced and the flow rate of the oxygen generating unit is increased accordingly to increase the output oxygen concentration.

[0015] Preferably, by adjusting the operating parameters of the molecular sieve separation device in the oxygen generation unit, the output concentration of the oxygen generation unit is changed, thereby adjusting the oxygen concentration in the final output air-oxygen mixture. The adjustment of the operating parameters includes: changing the adsorption pressure of the molecular sieve separation device, and / or changing the timing control of its switching valve.

[0016] Compared with the prior art, the advantages of the present invention are: (1) This invention reuses the original air compressor of the oxygen generator as the sole air source and branches off an air path downstream for dilution, so that a single device can perform all functions such as air compression, oxygen purification, air-oxygen mixing and flow regulation. This fundamentally overcomes the inherent defects of existing modular systems, such as numerous devices, complex wiring, poor mobility and high price of integrated devices.

[0017] (2) Some embodiments of the present invention provide a mathematical model for deriving the performance parameters of core components such as compressor gas volume A1 and oxygen production capacity B1 based on the reverse derivation of target flow rate E and oxygen concentration D1, which provides a theoretical basis for the engineering design of this new integrated system.

[0018] (3) In some embodiments of the present invention, an open-loop control scheme based on a "pressure regulating valve + fixed orifice flow cut-off element" and its precise design method are provided for the air branch. By providing a constant pressure environment through the pressure regulating valve and controlling the flow rate using a mechanical flow cut-off element that has been rigorously calculated and calibrated, this scheme can still achieve accurate and stable flow output without the need for expensive flow sensors.

[0019] (4) This invention provides two methods for adjusting oxygen concentration: the air-oxygen ratio mixing method and the oxygen production process modification method. These two methods constitute a complete solution for different hardware architectures and control requirements. The air-oxygen ratio mixing method, as a direct adjustment method, is suitable for systems with high dynamic response requirements. It achieves precise setting of the target by adjusting the air-oxygen flow ratio in real time. The oxygen production process modification method achieves fine control of concentration by adjusting internal process parameters. The two methods can work independently or in combination, ensuring that the equipment can achieve complete concentration adjustment function under different technical paths, greatly expanding the design boundaries and application scenarios of the product. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 The present invention provides a flowchart of a high-flow oxygen concentrator output method and a schematic diagram of a high-flow oxygen concentrator structure. Figure 2 This is a structural diagram of the airflow regulating unit described in this invention; Figure 3 This is a structural diagram of the airflow regulating unit with a buffer according to the present invention; Figure 4 This is a structural diagram of the airflow regulation unit with an airflow feedback sensor described in this invention; Figure 5 This is a structural diagram of the airflow regulating unit that simultaneously has a buffer and an airflow feedback sensor as described in this invention; Detailed Implementation

[0021] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] The present invention will be further described in detail below with reference to specific embodiments: like Figure 1 As shown, this invention provides a high-flow-rate oxygen concentrator output method and a high-flow-rate oxygen concentrator. For ease of description, the high-flow-rate oxygen concentrator will be introduced first.

[0023] The high-flow oxygen generator includes an air compressor, the downstream end of which is connected to the main oxygen production line, and the downstream end of the main oxygen production line is connected to the output pipeline. The air compressor draws air from the atmosphere and provides sufficient working air pressure and airflow to subsequent devices. The main oxygen production line is equipped with an oxygen production unit and an oxygen flow regulation unit.

[0024] The oxygen generation unit includes a nitrogen-oxygen separation device, which comprises a nitrogen-oxygen separation sieve tower, a cycle control circuit, pneumatic actuators, and an oxygen buffer storage tank. The nitrogen-oxygen separation device uses molecular sieves to separate oxygen from the air via pressure swing adsorption. The oxygen flow regulation unit includes an oxygen air pressure regulator, an oxygen flow valve, various feedback sensors, and various filtration devices, used to control the flow rate of generated oxygen.

[0025] To increase the output oxygen flow rate, this application includes an air branch connected in parallel with the oxygen generating unit. One end of the air branch is connected to the downstream end of the air compressor, and the other end is connected to the upstream end of the output pipeline. A portion of the air output from the air compressor flows through the air branch and mixes with the oxygen generated by the oxygen generating unit after humidification at the upstream end of the output pipeline, forming a high-flow-rate air-oxygen mixture, which is then delivered to the user. Furthermore, an air flow regulating unit is installed on the air branch to regulate the flow rate of the air flowing through it, ensuring that the air-oxygen mixture is output at the user's desired flow rate.

[0026] When the high-flow oxygen generator is working: An air compressor draws in ambient air and compresses it. After compression, the air splits into two streams at a split point downstream of the air compressor.

[0027] One stream enters the main oxygen production circuit: passing sequentially through the oxygen production unit and the oxygen flow regulating device, and producing oxygen at a controllable flow rate.

[0028] Another airflow enters the branch path: after passing through the airflow regulation unit, the output airflow is regulated.

[0029] After regulation, the oxygen and air combine at the mixing point upstream of the output line to form an air-oxygen mixture. This mixture then enters the output line and is ultimately delivered to the patient.

[0030] When the ratio of air to raw material required for extracting 90% oxygen concentration using a commonly used, fully-filled molecular sieve at 140 kPa is 10:1 (i.e., 10 L of air can produce 1 L of oxygen), and the selected air compressor provides an air volume of A1 (L / min) at the same pressure, and the oxygen production unit can produce oxygen with an oxygen content of C1 at a flow rate of B1 (L / min): combined with the fact that the air compressor needs an air flow rate of 10B1 (L / min) for oxygen production, the air flow rate through the air branch is calculated to be A1-10B1 (L / min).

[0031] Given that the oxygen content in the air is 21%, the oxygen content D1 and flow rate E in the air-oxygen mixture produced by the high-flow oxygen generator described in this application will satisfy the following conditions: ①

[0032] ② .

[0033] Calculating equations ① and ② yields: ①

[0034] ② .

[0035] like Figure 2 As shown, the air flow regulating unit includes at least an air pressure regulator and an air flow controller, and achieves open-loop control of the air flow output through the air branch through the air pressure regulator and the air flow controller.

[0036] The air pressure regulator is used to regulate the pressure of the air flowing through the air branch, ensuring that the air generated by the air compressor enters the air flow controller at a stable volume and pressure. Users can precisely set the output flow rate of the air branch by adjusting the air flow controller to output an air-oxygen mixture that meets the desired flow rate.

[0037] The air flow controller includes a flow-blocking element and a switching valve connected in series with the flow-blocking element. The flow-blocking element is constructed as a mechanical component with a through hole of a fixed opening, so that the air flow controller has an effective flow area A for air to pass through.

[0038] The gauge pressure setpoint P of the air pressure regulator is determined by the following method: Experiments have shown that the air velocity when passing through the flow cut-off element in this invention is greater than or equal to 0.3 times Mach number Ma, meaning that the air flow state at this time is a compressible gas state.

[0039] Because the downstream end of the output pipeline directly acts on the user, its output absolute pressure P2 is approximately equivalent to one standard atmosphere, 101.3 kPa.

[0040] Meanwhile, the maximum absolute pressure output by the air compressor generally does not exceed 300 kPa, and the adsorption working pressure of the nitrogen-oxygen separation device fluctuates within 120 kPa. Therefore, the theoretical maximum absolute pressure that the air pressure regulator can be set to is 300 kPa - 120 kPa = 180 kPa. Hence, the absolute pressure P1 at the upstream end of the throttling device is < 180 kPa.

[0041] Therefore, the ratio of the pressure changes before and after the throttling device... This ratio is greater than the classical jet theory-derived value of 0.528. Combined with the condition that the air flow is in a compressible gas state, we can conclude that: The airflow state through the throttling device is subcritical flow, thus the subcritical throttling flow rate formula for high-pressure gas is applicable:

[0042] in: Q: Airflow rate through the flow cut-off device, in L / min; A: Effective flow area of ​​the orifice of the flow cutter, in m²; C d Flow coefficient; P1: Absolute pressure at the upstream end of the flow-stopping component, in Pa; Absolute pressure at the downstream end of P2 flow cut-off component, unit: Pa; K: Gas adiabatic index; T1: Upstream gas thermodynamic temperature, in K; R: Gas constant.

[0043] Among them, C d Typically, it is 0.6~0.9, and in this embodiment, the middle value is taken as 0.75; P2 is the standard atmospheric pressure of 101.3 kPa; the gas adiabatic index K of air is 1.4; the air compressor output air temperature is taken as 40℃, that is, T1 is taken as 313.15K; the gas constant R of air is 287.

[0044] Substituting the above data into equation ③, we get: ③

[0045] The airflow rate Q through the flow cutter is calculated as: airflow rate E - oxygen flow rate B1 produced by the oxygen generator. Furthermore, the effective flow area A of the flow cutter's orifice can be calculated. Since only P1 is unknown in equation ③, P1 can be solved using a numerical iteration method.

[0046] To avoid insufficient inlet pressure of the shut-off device due to pressure loss caused by pipelines, a safety compensation of 5% to 10% is used. The gauge pressure setting value of the air pressure regulator is: ④ .

[0047] In other embodiments of this application, n flow-blocking elements can be connected in parallel, with each element connected in series with a switching valve. The airflow controller's speed is adjusted by opening and closing the corresponding switching valve. In this case, when n flow-blocking elements are connected in parallel, the effective flow area is the sum of the areas of each individual element. ⑤

[0048] The following example illustrates this: Assuming an airflow rate Q of 30 L / min through the flow cutter, and considering the use of a single flow cutter with a diameter d = 2 mm to achieve high-flow oxygen delivery, substituting into equation ③ yields the absolute pressure upstream of the flow cutter. The gauge pressure is 20 kPa.

[0049] Because the internal pipeline of the flow control module is relatively short and the pressure loss is small, 10% is taken as the safety compensation amount. Substituting into equation ④, we can obtain the design pressure of the pressure regulating valve P≥121.5x1.1-101.3=32.35kPa.

[0050] In addition to using a flow-blocking device in conjunction with a switching valve to regulate the airflow of the airflow controller, in other embodiments of this application, a motor with an encoder can be used in conjunction with a proportional valve to accurately control the opening degree of the effective flow area through which air passes.

[0051] For example, such as Figure 3 As shown, the air flow regulating unit may also include a buffer located upstream of the regulating device. The buffer is usually configured as a small-volume pressure stabilizing tank to absorb the high-frequency pulsation of the air compressor output airflow and provide a stable air source downstream.

[0052] For example, to achieve high flow control accuracy, such as Figure 4 As shown, the airflow regulating unit may further include an airflow feedback sensor. In this case, the airflow controller, the airflow feedback sensor, and a central controller are electrically connected to form a closed-loop flow control system. The controller dynamically adjusts the opening of the flow controller based on the difference between the set flow rate and the actual flow rate fed back by the sensor, thereby achieving precise and stable flow.

[0053] Furthermore, in order to meet higher flow control requirements, such as Figure 5 As shown, the airflow regulating unit includes both a buffer and an airflow feedback sensor.

[0054] This configuration allows for significant fluctuations in the airflow entering the air branch while maintaining stable, high-precision flow control. This composite design is particularly suitable for medical or industrial applications where high control precision is required, given the instability of the air input.

[0055] By combining modules such as buffers, air pressure regulators, flow controllers, and flow feedback sensors in different ways in the above embodiments, the air flow regulation unit can provide two control methods, including open-loop control and closed-loop control, thereby taking into account different application environments and cost considerations.

[0056] This invention provides two design methods for setting oxygen concentration: 1. Air-oxygen ratio mixing method: suitable for situations where the air flow control template can be flexibly adjusted.

[0057] The user or control system increases the set flow rate of the air branch through the air flow regulating unit, and at the same time reduces the flow rate of the main oxygen output line through the oxygen flow regulating unit, so that the total output flow rate E remains unchanged, thereby reducing the output oxygen concentration D1 from 40% to 30%.

[0058] For example: when the maximum demand target of high flow rate is E=60 L / min, the oxygen content D1 is 40%; the oxygen production unit produces oxygen with an oxygen content C1 of 90% and a maximum flow rate B1 of 16.5 L / min; the selected air compressor has an air volume A1 of 208.5 L / min.

[0059] The maximum demand target E for high flow rate needs to be changed to 60 L / min, and the oxygen content D1 needs to be changed to 30%.

[0060] The oxygen produced by the oxygen generating unit, which has an oxygen content C1 of 90% and a flow rate B1 of 16.5 L / min, can be changed to an oxygen content C1 of 90% and a flow rate B1 of 7.83 L / min. Accordingly, the original air supply with an oxygen content of 21% and a flow rate of 43.5 L / min was changed to 52.17 L / min.

[0061] Verification shows that the maximum demand target E = 7.83 + 52.17 = 60 L / min; The requirements are met.

[0062] 2. Oxygen production process modification method: This method is applicable to situations where the air flow controller uses a fixed-position adjustment configuration with a flow cut-off element and a switching valve, which cannot be flexibly adjusted. The oxygen concentration at high flow output is reduced by decreasing the oxygen concentration produced.

[0063] Specifically, the key to purifying oxygen using a nitrogen-oxygen separation device lies in: 1. The adsorption pressure of the nitrogen-oxygen separation sieve bed tower affects the adsorption efficiency of the molecular sieve for nitrogen. Generally speaking, the higher the adsorption pressure, the greater the adsorption capacity for nitrogen and oxygen.

[0064] II. Timing Control of Pneumatic Actuators under Periodic Control Circuit. Specifically, because the nitrogen-oxygen separation screen tower has an adsorption upper limit, two nitrogen-oxygen separation screen towers are usually set in the nitrogen-oxygen separation unit. The two nitrogen-oxygen separation screen towers are alternately operated by pneumatic actuators controlled by the periodic control circuit, so that while one nitrogen-oxygen separation screen tower is working, the other is releasing waste gas. By changing the switching sequence of the two nitrogen-oxygen separation screen towers, the oxygen concentration produced by the oxygen generation unit can be changed.

[0065] For example, with a maximum demand target of 60 L / min for high flow rate, an oxygen content of 40% (D1), an oxygen production unit capable of producing oxygen with an oxygen content of 90% (B1) at a flow rate of 16.5 L / min, and the selected air compressor providing an air volume of 208.5 L / min as a benchmark.

[0066] To maintain the maximum demand target E of 60 L / min, the oxygen content D1 is changed to 30%; and the air control module cannot change the flow rate and still outputs air at a flow rate of 43.5 L / min.

[0067] At this point, since the total output flow rate E is fixed at 60 L / min, and the air branch contributes a fixed 43.5 L / min, the oxygen flow rate B1 that the oxygen generating unit must provide is also fixed: B1= EQ = 60 L / min-43.5 L / min=16.5 L / min.

[0068] Under these constraints, the final oxygen concentration D1 of the mixed gas is entirely determined by the oxygen concentration C1 produced by the oxygen generation unit. This relationship can be derived from the mixing formula: The total oxygen content in the final mixture = oxygen contributed by the oxygen generation unit + oxygen contributed by the air branch. That is: E×D1 = (B1×C1) + (Q×0.21) Substitute the known values ​​into: 60 L / min×0.30=(16.5 L / min×C1)+(43.5 L / min×0.21) The calculation yields: 18 = 16.5C1 + 9.135 Solving for: 16.5C1 = 18 - 9.135 = 8.865 C1 = 8.865 / 16.5 ≈ 0.537 Based on this, when the air branch is at a fixed position, the system adjusts the program of the cycle control circuit to change the timing of pressurization, adsorption, and depressurization of the nitrogen-oxygen separation screen tower by the pneumatic actuator, or reduces the system working pressure by the pressure regulating valve in the oxygen flow regulating unit, thereby reducing the oxygen concentration C1 output by the oxygen generating unit from 90% to 53.7%.

[0069] This satisfies the technical requirement of changing the oxygen content D1 to 30% while maintaining the maximum demand target E of 60 L / min and ensuring that the air control module can output air at a flow rate of 43.5 L / min without changing the flow rate.

[0070] The above embodiments are merely illustrative of the technical concept and features of the present invention, intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and should not be construed as limiting the scope of protection of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of the present invention is defined by the appended claims rather than the foregoing description, and thus all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within the present invention.

Claims

1. A method for high-flow-rate output of an oxygen concentrator, characterized in that, An oxygen generating unit and an air branch connected in parallel with the oxygen generating unit are constructed between the air input end and the oxygen output end. A portion of the air supplied by the air input terminal is diverted to the air branch, and the air flowing through the air branch is regulated to mix with the oxygen generated by the oxygen generation unit to form an air-oxygen mixture, which is then output at a flow rate and concentration value that meets the user's expectations.

2. A high-flow oxygen generator, characterized in that, This includes an air compressor, main oxygen supply line, branch air supply lines, and output piping; The downstream end of the air compressor is connected to the main oxygen line, and the downstream end of the main oxygen line is connected to the output pipeline. An oxygen generating unit and an oxygen flow regulating unit are installed on the main oxygen supply line; One end of the air branch is connected to the downstream end of the air compressor, and the other end is connected to the upstream end of the output pipeline; An air flow regulation unit is provided on the air branch to regulate the flow rate of the air flowing through the air branch.

3. A high-flow oxygen generator according to claim 2, characterized in that, The air flow regulating unit includes an air pressure regulator and an air flow controller.

4. A high-flow oxygen generator according to claim 3, characterized in that, The airflow regulating unit includes a buffer disposed upstream of the air pressure regulator.

5. A high-flow oxygen generator according to claim 3 or 4, characterized in that, The airflow regulating unit includes an airflow feedback sensor. The airflow controller, the airflow feedback sensor, and a controller are electrically connected to form a closed-loop flow control system.

6. A high-flow oxygen generator according to claim 3, characterized in that, set up: The maximum airflow rate that the air compressor can provide is A1; The oxygen generating unit can produce oxygen with an oxygen content of C1 and a flow rate of B1. The oxygen content D1 and flow rate E in the produced air-oxygen mixture then satisfy the following conditions: ； 。 7. A high-flow oxygen generator according to claim 3 or 4, characterized in that, The air flow controller is configured to have a flow area A through which air passes. The setpoint P of the air pressure regulator is determined by the following method: Calculate the difference P between the maximum absolute pressure of the air compressor and the fluctuation range of the adsorption pressure of the oxygen generation module. C ; The classical spray theory-derived value of 0.528 is compared with the stated P. C Compare the ratio with the standard atmospheric pressure P2; when At that time, the subcritical throttling flow rate formula for high-pressure gas is used. P1 is calculated, and P = P1 - P2.

8. A high-flow oxygen generator according to claim 7, characterized in that, The air flow controller includes multiple flow-blocking components arranged in parallel, each of which has a through hole with a fixed opening, and at least some of the flow-blocking components are connected in series with a switching valve assembly.

9. A high-flow oxygen generator according to claim 5, characterized in that, The oxygen concentration of the final output mixed gas can be adjusted by regulating the output flow ratio between the air branch and the oxygen generation unit. Among them, while keeping the total output flow rate constant, the flow rate of the air branch is increased and the flow rate of the oxygen generating unit is reduced accordingly to decrease the output oxygen concentration, or the flow rate of the air branch is reduced and the flow rate of the oxygen generating unit is increased accordingly to increase the output oxygen concentration.

10. A high-flow oxygen generator according to claim 5, characterized in that, By adjusting the operating parameters of the oxygen generating unit, the output concentration of the oxygen generating unit can be changed, thereby adjusting the oxygen concentration in the final output air-oxygen mixture. The adjustment of the operating parameters includes: changing the adsorption pressure of the oxygen generation unit, and / or changing the timing control of its switching valve.

Images