CN2540188Y - Small medical oxygenerator with oxygen concentration detection function - Google Patents

Abstract

The utility model discloses a small medical oxygen generator with oxygen concentration detection function, which comprises a filter, a control valve, a nitrogen and oxygen separation device, an oxygen storage tank, a pressure reducing valve, a flow meter and a control unit, a small oil-free air compressor Machine, heat exchanger, oxygen concentration monitoring device, oxygen concentration indicator light, wherein: the air source is connected to a small oil-free air compressor through a filter, one end of the nitrogen and oxygen separation device is connected to the heat exchanger through a control valve, and the other end To the oxygen storage tank, the output end of the oxygen storage tank is connected to the user end through a pressure reducing valve and a flow meter, and the oxygen concentration monitoring device is connected in series between the flow meter and the user end, and is electrically connected to the control unit; the exhaust end of the nitrogen-oxygen separation device is connected to the At the input end of the muffler, the control unit is electrically connected to the control valve, and is electrically connected to the oxygen concentration monitoring device and the oxygen concentration indicator light. It has the characteristics of wide range of oxygen measurement, high accuracy, good repeatability, fast response time and long life.

Description

Medical small oxygen generator with oxygen concentration detection function

technical field

The utility model relates to an oxygen supply device, in particular to a small medical oxygen generator with the function of detecting oxygen concentration.

Background technique

Oxygen is a necessity in people's life. For a long time, the oxygen supply methods in the international medical field mainly include liquid oxygen and high pressure oxygen. In recent years, due to the rapid development of pressure swing adsorption (PSA) technology, it has brought new opportunities Development Opportunities. Small health care oxygen machines have entered people's daily life. It only needs to be connected to the power supply, and it can instantly separate dust-free and sterile oxygen from the air. The oxygen supply method is unique, and it has incomparable advantages of liquid oxygen and hyperbaric oxygen, such as adjustable flow rate, convenient operation, and low cost of oxygen production. , Safe and reliable use, etc.

From the application point of view, when the oxygen generator is close to its service life, or when the oxygen generator has an external failure that is not easy to observe, the oxygen concentration of the oxygen generator must be reduced, but at this time consumers cannot know the oxygen concentration of the oxygen generator. Whether the separated oxygen can still play a role in medical care, when the oxygen concentration is reduced to a certain extent, the oxygen generator is still used, which will affect the medical effect of the patient, and even the health of the patient. This requires the oxygen generator to have a concentration detection function. However, the traditional electrochemical oxygen concentration sensor has some problems in terms of convenience of installation, stability of measured value, one-time calibration, etc., and the price is also high, which limits its application in small oxygen generators.

Utility model content

In order to overcome the above deficiencies, the purpose of this utility model is to provide a medical small oxygen generator with oxygen concentration detection function which can detect oxygen concentration in real time by adopting zirconia oxygen concentration sensor.

The technical scheme of the utility model is: including a filter, a control valve, a nitrogen and oxygen separation device, an oxygen storage tank, a pressure reducing valve, a flow meter and a control unit, and also includes a small oil-free air compressor, a heat exchanger, and an oxygen concentration monitoring device , Oxygen concentration indicator light, wherein: the air source is connected to a small oil-free air compressor through a filter, one end of the nitrogen and oxygen separation device is connected to a heat exchanger through a control valve, and the other end is connected to the oxygen storage tank, and the output end of the oxygen storage tank The oxygen concentration monitoring device is connected in series between the flow meter and the user end through the pressure reducing valve and the flow meter, and is electrically connected to the control unit; the exhaust end of the nitrogen and oxygen separation device is connected to the input end of the muffler device, and the control unit and the control valve Electrically connected, and electrically connected with the oxygen concentration monitoring device and the oxygen concentration indicator light.

The utility model has the following advantages:

1. The zirconia oxygen concentration sensor adopted in the utility model is a novel limiting current oxygen sensor. It has the characteristics of wide range of oxygen measurement, high accuracy, good repeatability, fast response time, and long life. The sensor has reached the international advanced level, can be calibrated at one time, small in size, and easy to install.

2. The utility model monitors the oxygen concentration in real time.

3. The utility model has segmented oxygen concentration display lights, which are intuitive to display, and will be accompanied by a sound alarm when the oxygen concentration drops to a certain range.

4. It has broad application prospects. The utility model can be applied to hospitals, and can also be used as a family health care appliance to go to thousands of households.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2A is a schematic structural diagram of the oxygen storage tank in Fig. 1 .

Fig. 2B is a right side view of Fig. 2A.

Fig. 3A is a schematic structural diagram of the nitrogen separation device in Fig. 1 .

Fig. 3B is a right side view of Fig. 3A.

FIG. 4 is a schematic structural diagram of the oxygen concentration monitoring device in FIG. 1 .

Fig. 5 is a schematic structural diagram of the noise reduction device in Fig. 1 .

FIG. 6A is a schematic structural diagram of the heat exchanger in FIG. 1 .

Figure 6B is a side view of Figure 6A.

Fig. 7 is a schematic structural diagram of the filter in Fig. 1 .

Fig. 8 is a partial schematic structure diagram of the control unit in Fig. 1 .

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail.

As shown in Figure 1, the utility model consists of a filter 12, a small oil-free air compressor 11, a heat exchanger 10, a control valve 8, a nitrogen and oxygen separation device 4, an oxygen storage tank 3, a pressure reducing valve 5, and a flow meter 7 , an oxygen concentration monitoring device 6, a control unit 2, and an oxygen concentration indicator 1, the air source is connected to a small oil-free air compressor 11 through a filter 12, and one end of the nitrogen-oxygen separation device 4 is connected to a heat exchanger through a control valve 8 10, the other end is connected to the oxygen storage tank 3, the output end of the oxygen storage tank 3 passes through the pressure reducing valve 5 and the flow meter 7 to the user end, the oxygen concentration monitoring device is connected in series between the flow meter 7 and the user end, and is connected to the control unit 2 Electrical connection; the nitrogen separated from the nitrogen-oxygen separation device 4 goes to the silencer 9, the control unit 2 controls the control valve 8, and is electrically connected to the oxygen concentration monitoring device 6 and the oxygen concentration indicator light 1; the control valve 8 in this embodiment adopts a pilot The nitrogen and oxygen separation device 4 is a parallel connection structure of two molecular sieve tanks, which work alternately, and the nitrogen and oxygen separation device 4 is controlled by the control valve 8 to work alternately. When a nitrogen and oxygen separation device 4 is in the intake state, Another nitrogen and oxygen separation device 4 is in exhaust state.

As shown in Figures 2A and 2B, the oxygen storage tank 3 includes upper and lower heads 31, 38, a tank body 36, and a one-way valve 32. Together, sealing rings 37 are provided at the two ends of the upper and lower heads 31, 38 and the tank body 36, the check valve 32 is installed on the upper head 31, and a tank body 36 is provided with an activated carbon 34 for filtering. The core pipe 35 is provided with a filter cloth 33 between the active carbon 34 and the one-way valve 32, wherein the filter cloth 33 is a non-woven fabric, and the one-way valve 32 is a rubber pad, and the support structure is positioned at the middle of it. Placed at the entrance of the upper head 31; the function of the oxygen storage tank 3 is: the oxygen from the nitrogen and oxygen separation device 4 enters the tank body 36 through the check valve 32 for storage;

As shown in Figures 3A and 3B, the nitrogen and oxygen separation device 4 is composed of upper and lower heads 41, 48, a sieve plate 46, a molecular sieve 44, a tank body 43 and a spring 42, and the upper and lower heads 41, 48 are passed through head nails. 49 is installed together with the tank body 43, and the sieve plate 46 with the filter cloth 45 is located at both ends of the molecular sieve 44. In the tank body 43, the spring 42 is arranged between the upper head and a sieve plate 46, and the upper and lower heads 41, 48 The side walls and the tank body 43 are tightly matched through the sealing ring 47. The molecular sieve 44 is a commercially available 5A product, and its working principle is: the air from the compressor 11 passes through the nitrogen and oxygen separation device 4. The tank body 43 forms a certain pressure, and the molecular sieve 44 absorbs the nitrogen in the air, separates the oxygen, and sends it to the upper head 31 of the oxygen storage tank 3 .

As shown in Figure 4, the oxygen concentration monitoring device 6 is composed of an oxygen sensor cover 61, an oxygen concentration sensor 62, a screw 63, a sealing ring 64, a pressure cap 65, and an oxygen sensor seat 66. The oxygen sensor cover 61 and the oxygen sensor seat 66 Installed together by screws 63, the oxygen sensor 62 is installed in the cavity formed by the oxygen sensor cover 61 and the oxygen sensor seat 66 through the pressure cap 65, the pressure cap 65 is used to fix the oxygen concentration sensor 62, in the oxygen sensor cover 61, the oxygen sensor The seat 66 is respectively provided with an air inlet and an air outlet, and oxygen flows through the device through the air inlet and the air outlet, so that the oxygen concentration sensor 62 can detect the oxygen content in the device, and transmit the electrical signal to the control unit through the wire 2.

As shown in Figure 5, the silencer 9 is made up of a silencer core tube 91, a plastic silencer 92, a filter cotton 93, and a silencer barrel 94. The plastic silencer 92 is fixed on the silencer core tube 91, and the filter cotton 93 Set in the muffler cylinder 94, the muffler core tube 91 and the muffler cylinder 94 are snap-fit structures, the nitrogen gas discharged from the oxygen and nitrogen separation device 4 enters the muffler device 9 through the muffler core tube 91 and then passes through the plastic muffler 92 And filter cotton 93 to reduce noise.

As shown in Figures 6A and 6B, the heat exchanger 10 is composed of cooling fins 101, copper tubes 102 and joints 103. The copper tubes 102 are curved stacked structures installed on the cooling fins 101, and hot air is passed through them. The hot air passes through the copper pipe 102, and the heat sink 101 fixed on the copper pipe 102 cools the hot air.

As shown in Figure 7, the filter 12 is provided with a filter cloth 122 structure in the housing 121, the filter cloth 122 is supported by a support 123, and the support 123 is provided with small holes, and the two ends of the housing 121 are respectively equipped with In and out holes.

As shown in FIG. 8 , the control unit 2 of the oxygen generator includes five parts: power supply, data acquisition, CPU control, valve drive, and oxygen concentration sound and light alarm. in:

The power supply part is mainly composed of 220V AC input terminal J10, transformer input terminal J11, transformer output terminal J7, the first rectifier bridge B1 and the first and second three-terminal voltage regulators U2 and U11, among which: the first rectifier bridge B1, the first 1 Three-terminal voltage regulator U2 and the second three-terminal voltage regulator U11 form a two-way power supply; the principle is: 220V AC is connected to the transformer input terminal J11 through the input terminal J10, and the AC power after the step-down of the transformer passes through the transformer output terminal J7 Connect to pins 1 and 3 of the first rectifier bridge B1, pins 2 and 4 of the first rectifier bridge B1 output direct current, and output a stable DC 12V voltage +12 after being stabilized by the first three-terminal voltage regulator U2, as a control valve 8. The power supply of the driving part, the first rectifier bridge B1 outputs direct current, and the second three-terminal voltage regulator U11 outputs another power supply VCC for the needs of other parts;

The data acquisition part consists of AD converter TLC0832 U10, the second rectifier bridge B2, the third and fourth three-terminal voltage regulators U6 and U7, the operational amplifier U5B, and the oxygen concentration sensor interface J8. The output terminal J7 is connected to the 1st and 3rd pins of the second rectifier bridge B2, the 2nd and 4th pins of the second rectifier bridge output and rectify the DC power, and the 3rd pin of the third three-terminal regulator U6 is the voltage input end, and the 2 The rectifier bridge is connected to B2, the second pin is the voltage output terminal, connected to the oxygen concentration sensor interface J8, the first pin is connected to the potentiometer W4, and the output voltage of the third three-terminal regulator U6 is adjusted by adjusting the resistance of the potentiometer W4 , the DC voltage regulated by the third three-terminal regulator U6 is output to pins 3 and 4 of the oxygen concentration sensor interface J8 to provide heating voltage for the oxygen concentration sensor 62;

Pin 1 of the input end of the fourth three-terminal voltage regulator U7 is connected to the first rectifier bridge B1 of the power supply part, and the potentiometer W5 connected to the second pin is used to adjust the output voltage of the fourth three-terminal voltage regulator U7. The DC voltage stabilized by the voltage regulator U7 provides the operating voltage for the oxygen concentration sensor 62 through the first and second pins of the oxygen concentration sensor interface J8;

The sampling resistor R23 is located at the positive phase terminal of the operational amplifier U5B and is connected to the oxygen concentration sensor interface J8. The sampling resistor R23 converts the current signal of the oxygen concentration sensor 62 into a voltage signal, which is amplified by the operational amplifier U5B and then input to the first signal of the AD converter U10. 3 pins, convert analog signal to digital signal.

The CPU part is the core part of the entire circuit board, mainly composed of a microprocessor U1 and a data memory U9. The microprocessor U1 is connected to the AD converter U10 through pins 3, 4, and 5 to process the collected digital signals. The microprocessor U1 also scans the keyboard interface (J3) regularly, and drives the liquid crystal display through the LCD interface J2;

The valve driving part determines the on-off of the control valve 8 according to the control signal of the CPU. It is mainly composed of the first and second triodes T2 and T3, the first and second light-emitting diodes L1 and L2, and the pilot valve interface J1. Among them: the first and second Light-emitting diodes L1 and L2 are installed on the collector stages of the first and second transistors T2 and T3 respectively, and the base stages of the first and second transistors T2 and T3 are respectively connected to pins 1 and 2 of the microprocessor. These two pins The level of the level determines the switching state of the two triodes, thereby controlling the charging state of the pilot valve, and finally controlling the control valve 8 .

The oxygen concentration sound and light alarm part is composed of the light-emitting diode interface J4, the third, fourth, fifth, and sixth transistors T1, T6, T7, T8, and the buzzer S1, wherein: the third transistor T1 and the 14th pin of the microprocessor U1 Connected, through the signal of the microprocessor U1 to control the on-off of the buzzer S1, the buzzer S1 is at the collector level of the third transistor T1; the fourth, fifth and sixth transistors T6, T7, T8 are respectively connected to the microprocessor U1 Pins 8, 6, and 7 are connected, and the control principle is the same as above.

The microprocessor U1 described in the utility model adopts 89C52, the memory U9 adopts X24C45, the AD converter U10 adopts TLC0832, all triodes adopt 8050, the first three-terminal voltage regulator adopts 7812, and the second three-terminal voltage regulator adopts 7805, The third three-terminal regulator adopts LM317T, the fourth three-terminal regulator adopts LM317H,

The oxygen concentration sensor 62 described in the utility model adopts CY-16N;

Pressure reducing valve 5 adopts AR2000; control valve 8 adopts pilot-operated air control valve; small oil-free air compressor unit 11 adopts ZW370A6.

comparative example

The utility model's distributed oxygen supply is characterized by using zirconia oxygen concentration sensor to monitor the oxygen concentration output by the oxygen generator in real time, and using red, yellow and green indicator lights to indicate the range of oxygen concentration. When the machine breaks down or reaches the expected At the end of life, when the oxygen concentration is lower than the set range, the red indicator light will be on, and the buzzer will sound an alarm to ensure the safe use of users. The sensor has high detection accuracy, is stable and not easy to drift, and is more suitable for the use of oxygen generators. At present, the oxygen generators produced by other manufacturers do not have this function.

Claims (7)

1. A small medical oxygen concentrator with oxygen concentration detection function, including filter (12), control valve (8), nitrogen and oxygen separation device (4), oxygen storage tank (3), pressure reducing valve (5) , a flow meter (7) and a control unit (2), characterized in that: it also includes a small oil-free air compressor (11), a heat exchanger (10), an oxygen concentration monitoring device (6), an oxygen concentration indicator light (1 ), wherein: the air source is connected to a small oil-free air compressor (11) through a filter (12), one end of the nitrogen-oxygen separation device (4) is connected to a heat exchanger (10) through a control valve (8), and the other One end is connected to the oxygen storage tank (3), the output end of the oxygen storage tank (3) is connected to the user end through the pressure reducing valve (5) and the flow meter (7), and the oxygen concentration monitoring device (6) is connected in series between the flow meter (7) and the user end. between the terminals and is electrically connected to the control unit (2); the exhaust end of the nitrogen and oxygen separation device (4) is connected to the input end of the muffler device (9), the control unit (2) is electrically connected to the control valve (8), and is connected to the oxygen The concentration monitoring device (6) is electrically connected with the oxygen concentration indicator light (1). 2. According to the medical small oxygen generator with oxygen concentration detection function according to claim 1, it is characterized in that: the oxygen concentration monitoring device (6) consists of an oxygen sensor cover (61), an oxygen concentration sensor (62), a sealing ring (64), pressure cap (65), oxygen sensor seat (66) form, oxygen sensor cover (61) and oxygen sensor seat (66) are installed together, and oxygen concentration sensor (62) is installed in by pressure cap (65) In the cavity formed by the oxygen sensor cover (61) and the oxygen sensor seat (66), an air inlet and an air outlet are respectively arranged on the oxygen sensor cover (61) and the oxygen sensor seat (66), and the oxygen concentration sensor (62) passes through The wire is electrically connected with the control unit (2). 3. According to the medical small oxygen generator with oxygen concentration detection function according to claim 1, it is characterized in that: the noise reduction device (9) consists of a silencer core tube (91), a plastic silencer (92), a filter cotton ( 93), the muffler cylinder (94), the plastic muffler (92) is fixed on the muffler core pipe (91), the filter cotton (93) is located in the muffler cylinder (94), and the muffler core pipe ( 91) and the muffler cylinder (94) are snap-fit structures, and are connected with the oxygen-nitrogen separation device (4). 4. The medical small oxygen concentrator with oxygen concentration detection function according to claim 1, characterized in that: the heat exchanger (10) is composed of cooling fins (101), copper pipes (102) and joints (103) , the copper pipe (102) is a curved stacked structure, installed on the heat sink (101), wherein hot air is passed through. 5. The medical small oxygen generator with oxygen concentration detection function according to claim 1, characterized in that: the control unit (2) is composed of six parts: power supply, data acquisition, CPU, valve drive, and oxygen concentration sound and light alarm , wherein: the power supply part is composed of the first rectifier bridge (B1), the first and second three-terminal voltage regulators (U2, U11) to form two power supplies; the AC power is connected to the first rectifier bridge (B1) through the transformer output terminal (J7) 1. After voltage stabilization, the first three-terminal regulator (U2) outputs a stable DC 12V voltage as the power supply for the drive part of the control valve (8), and the second three-terminal regulator takes the output signal of the first rectifier bridge (B1) as the input signal. The output of the compressor (U11) is other parts of the control unit (2); The data acquisition part is composed of AD converter (U10), the second rectifier bridge (B2), the third and fourth three-terminal regulators (U6, U7), operational amplifier (U5B) and oxygen concentration sensor interface (J8), The input terminal of the second rectifier bridge (B2) is connected to the output terminal of the transformer (J7), and the rectified DC power is output to the voltage input terminal of the third three-terminal voltage regulator (U6), and the voltage output of the third three-terminal voltage regulator (U6) terminal to the oxygen concentration sensor interface (J8), its first pin is connected to the potentiometer (W4); the input terminal of the fourth three-terminal voltage regulator (U7) is connected to the first rectifier bridge (B1) of the power supply part, and its 2 The pin is connected to the potentiometer (W5), and the output terminal of the fourth three-terminal voltage regulator (U7) is connected to the oxygen concentration sensor interface (J8); the sampling resistor (R23) is located at the positive phase terminal of the operational amplifier (U5B) and connected to the oxygen concentration sensor interface (J8). The sensor interface (J8) is connected to the AD converter (U10) after the operational amplifier (U5B); The CPU part is mainly composed of a microprocessor (U1) and a data memory (U9). The microprocessor (U1) is connected to the AD converter (U10), and the other is connected to the data memory (U9). The keyboard interface (J3) is also connected. Scan regularly, and connect to the LCD display through the LCD interface (J2); The valve driving part is mainly composed of the first and second transistors (T2, T3), the first and second light-emitting diodes (L1, L2), and the pilot valve interface (J1), in which: the first and second light-emitting diodes (L1, L2) are respectively Installed on the collector stages of the first and second triodes (T2, T3), the base stages of the first and second triodes (T2, T3) are connected to the microprocessor (U1) respectively, so as to control the charged state of the pilot valve; The oxygen concentration sound and light alarm part is composed of the light-emitting diode interface (J4), the third, fourth, fifth, and sixth transistors (T1, T6, T7, T8), and the buzzer (S1), of which: the third transistor (T1) It is connected with the microprocessor U1, and the buzzer (S1) is controlled by the signal of the microprocessor U1. The buzzer (S1) is at the collector level of the third transistor (T1); the fourth, fifth, and sixth transistors ( T6, T7, T8) are respectively connected with the microprocessor (U1). 6. The medical small oxygen generator with oxygen concentration detection function according to claim 1, characterized in that: the control valve (8) is a pilot-operated air control valve. 7. The medical small oxygen generator with oxygen concentration detection function according to claim 1, characterized in that: the nitrogen and oxygen separation device (4) is a parallel connection structure of two molecular sieve tanks.

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