Oxygen supply amount control device of oxygen generator based on concentration flow feedback

Abstract

The utility model discloses an oxygenerator oxygen supply amount control device based on concentration flow feedback, which comprises a controller, sensors, an air compressor, a molecular sieve adsorption tower and an oxygen storage tank, the air compressor, the molecular sieve adsorption tower and the oxygen storage tank are connected in sequence, a flow concentration meter and a proportional valve are installed at an oxygen outlet of the oxygen storage tank, the proportional valve is connected with an oxygen supply connector, and the sensors comprise a pressure sensor and a temperature sensor. The pressure sensor and the temperature sensor are used for detecting the pressure value and the temperature value of the external environment respectively, and the controller is electrically connected with the air compressor, the flow concentration meter, the proportional valve, the pressure sensor and the temperature sensor and controls the rotating speed of the air compressor or the working time of the molecular sieve adsorption tower or the opening degree of the proportional valve so as to adjust the oxygen supply amount of the oxygen generator. The device controls the rotating speed of the air compressor under different temperature and pressure conditions, so that the oxygen output concentration is in a preset value error range, and the sufficiency of the oxygen supply amount of the oxygen generator is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of oxygen concentrators, and in particular relates to an oxygen supply quantity control device for an oxygen concentrator based on concentration flow feedback. Background Art

[0002] At present, the concentration and flow control of oxygen concentrators is relatively simple. Flow control usually adds a float flowmeter and a needle valve at the output end, and uses the special instructions for low-altitude areas in the specification to use volume flow instead of mass flow. Concentration control measures the output concentration of the oxygen concentrator through an ultrasonic concentration meter and performs simple speed regulation negative feedback on the air compressor.

[0003] When the oxygen generator is used in high-altitude areas, the conversion of mass flow rate by float flowmeter is more complicated, and it is difficult for users to accurately adjust the flow rate; the concentration data of ultrasonic flowmeter in high-altitude areas is quite different from that in plain areas, and the concentration meter cannot be used without correction; in addition to the decrease in the exhaust volume of the air compressor in high-altitude areas, the time of each stage such as pressure boosting, adsorption, pressure equalization, and cleaning in the working state of the oxygen generator will vary greatly, making it difficult to ensure the accuracy of oxygen supply regulation. Utility Model Content

[0004] The purpose of the utility model is to solve at least one problem of the prior art and to provide an oxygen supply control device for an oxygen concentrator based on concentration flow feedback.

[0005] To achieve the above-mentioned purpose, the utility model proposes an oxygen supply control device for an oxygen concentrator based on concentration flow feedback, comprising a controller, a sensor, an air compressor, a molecular sieve adsorption tower, and an oxygen storage tank connected in sequence, the oxygen outlet of the oxygen storage tank is equipped with a flow concentration meter and a proportional valve, the proportional valve is connected to the oxygen supply connector, the sensor comprises a pressure sensor and a temperature sensor, the pressure sensor and the temperature sensor are respectively used to detect the pressure value and the temperature value of the external environment, the controller is electrically connected to the air compressor, the flow concentration meter, the proportional valve, the pressure sensor, and the temperature sensor, and controls the rotation speed of the air compressor or the working time of the molecular sieve adsorption tower or the opening of the proportional valve to adjust the oxygen supply of the oxygen concentrator.

[0006] Preferably, the proportional valve is a solenoid valve.

[0007] Preferably, the flow concentration meter includes a flow meter and a concentration meter.

[0008] Preferably, the controller includes a DSP control chip or a PIC control chip.

[0009] Beneficial effects of the utility model: the utility model detects the oxygen output concentration of the oxygen concentrator by using a flow concentration meter, and detects the temperature value and pressure value of the external environment by a temperature sensor and a pressure sensor. The controller receives the oxygen output concentration detection value, the external environment temperature value and pressure value and combines the flow concentration detection negative feedback, and controls the speed of the air compressor under different temperature and pressure conditions so that the oxygen output concentration is within the preset value error range, thereby ensuring the adequacy of the oxygen supply of the oxygen concentrator.

[0010] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a working principle diagram of an embodiment of the utility model.

[0012] In the figure: 1-controller, 2-pressure sensor, 3-temperature sensor, 4-air compressor, 5-molecular sieve adsorption tower, 6-oxygen storage tank, 7-flow concentration meter, 8-proportional valve, 9-oxygen supply connector. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described in conjunction with the drawings in the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, not all of the embodiments. The components of the embodiment of the present application described and shown in the drawings here can be arranged and designed in various different configurations. In the description of the present application, it should be noted that the orientation or position relationship indicated by the terms "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship usually placed when the application product is used, which is only for the convenience of describing the present application 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 application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0014] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0015] The utility model is described in detail below in conjunction with the accompanying drawings.

[0016] See also Figure 1 The present embodiment provides an oxygen supply control device for an oxygen concentrator based on concentration flow feedback, comprising a controller 1, a sensor, an air compressor 4, a molecular sieve adsorption tower 5, and an oxygen storage tank 6 connected in sequence, a flow concentration meter 7 and a proportional valve 8 installed at the oxygen outlet of the oxygen storage tank 6, the proportional valve 8 is connected to the oxygen supply connector 9, the sensor comprises a pressure sensor 2 and a temperature sensor 3, the pressure sensor 2 and the temperature sensor 3 are respectively used to detect the pressure value and the temperature value of the external environment, the controller 1 is electrically connected to the air compressor 4, the flow concentration meter 7, the proportional valve 8, the pressure sensor 2, and the temperature sensor 3, and controls the rotation speed of the air compressor 4 or the working time of the molecular sieve adsorption tower 5 or the opening of the proportional valve 8 to adjust the oxygen supply of the oxygen concentrator.

[0017] Among them, the model of pressure sensor 2 is MPXHZ6115AC6U, and the model of temperature sensor 3 is NXRT15XH103FA1B020 ambient temperature sensor. After the pressure sensor 2 and the temperature sensor 3 collect the temperature and pressure value information of the environment, the detection values ​​are sent to the controller 1. The sensor is installed on the shell of the oxygen generator, and the controller 1, the air compressor 4, the molecular sieve adsorption tower 5, and the oxygen storage tank 6 are all installed in the shell of the oxygen generator.

[0018] Under ideal conditions, according to the Clapeyron equation PV=nRT, P is the external environmental pressure value, V is the environmental pressure value detected by the pressure sensor, V is the volume of oxygen, n is the amount of oxygen molecules, R is a constant, and T is the ambient temperature value detected by the temperature sensor. From this equation, it can be seen that the volume of oxygen will change under different temperature and pressure environments.

[0019] In this embodiment, the proportional valve 8 is a solenoid valve.

[0020] In this embodiment, the flow concentration meter includes a flow meter and a concentration meter, and the flow meter and the concentration meter are electrically connected to the controller respectively.

[0021] In this embodiment, the controller 1 includes a DSP control chip or a PIC control chip, and the model of the DSP control chip is dsPIC33FJ64MC506.

[0022] Working process of this utility model:

[0023] During the operation of the oxygen supply control device of the oxygen concentrator, the pressure sensor and the temperature sensor detect the pressure and temperature values ​​of the external environment, and transmit the detected values ​​to the controller. The controller calculates the gas volume flow rate, oxygen concentration correction parameters, air compressor theoretical speed, adsorption tower pressure increase and analysis time under the corresponding environmental conditions, and transmits the relevant control signals to each component.

[0024] At the same time, the flow concentration meter transmits the detected oxygen concentration value to the controller. When the oxygen concentration is lower than 90% of the preset target value, the controller will output a control signal to the air compressor to increase its speed until the oxygen flow concentration reaches 90% of the preset target value, thereby ensuring sufficient oxygen supply.

[0025] Specifically, in plain areas, the initial speed of the air compressor of the oxygen generator is 3000rpm, and the flow meter outputs 3LPM oxygen according to the environmental parameters of 0 altitude and 20℃; when it is at an altitude of 3000m and the ambient temperature is 10℃, the ambient pressure sensor and the ambient temperature sensor send the detected information to the DSP control chip of the controller. The volume flow rate at 3000m and 10℃ plateau environmental conditions is 1.38 times that at 0m and 20℃. The flow concentration meter collects the oxygen concentration information and transmits it to the DSP control chip. The DSP control chip can calculate that the volume flow rate at 3000m and 10℃ plateau environmental conditions is 1.38 times that at 0m and 20℃ plain environmental conditions according to the ideal gas equation PV=nRT. The opening of the proportional valve is controlled according to the numerical value of the flow meter to output it at a volume flow rate of 4.14LPM. At the same time, the DSP control chip outputs a control signal to the air compressor to adjust its speed to 4000rpm, and the pressure increase and analysis time in the adsorption tower are increased by 2S. The preset correction factor is multiplied when measuring and calculating the oxygen concentration.

[0026] During operation, the concentration meter continuously detects the oxygen concentration output by the equipment. When the oxygen concentration is detected to be lower than 90%, the air compressor speed is adjusted to 4500 rpm. Through continuous feedback and adjustment, the oxygen concentration of the equipment is eventually made higher than 90%.

[0027] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. An oxygen supply control device for an oxygen concentrator based on concentration flow feedback, characterized in that: It includes a controller, a sensor, an air compressor, a molecular sieve adsorption tower, and an oxygen storage tank connected in sequence. The oxygen outlet of the oxygen storage tank is equipped with a flow concentration meter and a proportional valve. The proportional valve is connected to the oxygen supply connector. The sensor includes a pressure sensor and a temperature sensor. The pressure sensor and the temperature sensor are respectively used to detect the pressure value and temperature value of the external environment. The controller is electrically connected to the air compressor, the flow concentration meter, the proportional valve, the pressure sensor, and the temperature sensor, and controls the rotation speed of the air compressor or the working time of the molecular sieve adsorption tower or the opening of the proportional valve to adjust the oxygen supply of the oxygen generator.

2. The oxygen supply control device for an oxygen concentrator based on concentration flow feedback according to claim 1, characterized in that: The proportional valve is a solenoid valve.

3. The oxygen supply control device for an oxygen concentrator based on concentration flow feedback according to claim 1, characterized in that: The flow concentration meter includes a flow meter and a concentration meter.

4. The oxygen supply control device for an oxygen concentrator based on concentration flow feedback according to claim 1, characterized in that: The controller includes a DSP control chip or a PIC control chip.

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