CN111257164B

CN111257164B - A testing arrangement that is used for many beds of machine-carried molecular sieve comprehensive properties

Info

Publication number: CN111257164B
Application number: CN201911039136.2A
Authority: CN
Inventors: 屠毅; 贺旺; 林晶; 曾宇; 王良; 姜茜
Original assignee: Hunan University of Arts and Science
Current assignee: Hunan University of Arts and Science
Priority date: 2019-10-29
Filing date: 2019-10-29
Publication date: 2022-04-01
Anticipated expiration: 2039-10-29
Also published as: CN111257164A

Abstract

The invention is suitable for the field of molecular sieve oxygen generation, and provides a device for testing the comprehensive performance of an airborne multi-bed molecular sieve, which comprises a molecular sieve inlet air conditioning subsystem, a variable multi-bed molecular sieve system, a vacuum cabin subsystem and a testing subsystem; the molecular sieve inlet air conditioning subsystem is connected with the variable multi-bed molecular sieve system and is used for providing inlet air meeting the test requirement; the variable multi-bed molecular sieve system is connected with the vacuum cabin subsystem and the test adjusting subsystem and is used for controlling adsorption and desorption of each molecular sieve bed according to test requirements, obtaining oxygen-enriched gas by adsorbing nitrogen of inlet air and transmitting the oxygen-enriched gas to the test subsystem, and desorbing and transmitting the adsorbed nitrogen to the vacuum cabin subsystem; the vacuum chamber subsystem is used for collecting nitrogen; and the test subsystem is used for acquiring performance parameters representing the performance of the molecular sieve according to the oxygen-enriched gas. The performance of the molecular sieve oxygen generation equipment can be tested, and development of related products are facilitated.

Description

A testing arrangement that is used for many beds of machine-carried molecular sieve comprehensive properties

Technical Field

The invention relates to the technical field of molecular sieve oxygen production, in particular to a device for testing the comprehensive performance of an airborne multi-bed molecular sieve.

Background

The molecular sieve oxygen concentrator is a core component of an airborne molecular sieve oxygen generation system, and adopts a zeolite molecular sieve as an adsorbent. Based on the principle of pressure swing adsorption, the preferential adsorption of zeolite molecular sieve to nitrogen is utilized to realize oxygen-nitrogen separation and generate oxygen-enriched gas. The molecular sieve oxygen concentrator generally consists of a plurality of molecular sieve beds, and each bed works alternately and is in an adsorption state and a desorption state respectively, so that high-pressure gas from an engine is subjected to adsorption separation of the molecular sieve beds to generate oxygen-enriched gas. The performance of the molecular sieve oxygen concentrator is closely related to gas supply parameters, working environment parameters, desorption pressure and the like. The domestic onboard molecular sieve oxygen generation system has been used in a plurality of advanced fighter aircraft loaders, and is an important development direction of an oxygen source system of an airplane in the future. However, the method is quite lack of development guarantee conditions, and at present, the special equipment for testing the performance of the molecular sieve oxygen concentrator is lacked, so that the product development and development are seriously influenced and limited.

Disclosure of Invention

The embodiment of the invention provides a device for testing the comprehensive performance of an airborne multi-bed molecular sieve, which is used for meeting the performance test of a molecular sieve material.

The embodiment of the invention is realized in such a way, and provides a device for testing the comprehensive performance of an airborne multi-bed molecular sieve, which comprises: the system comprises a molecular sieve inlet air conditioning subsystem, a variable multi-bed molecular sieve system, a vacuum cabin subsystem and a test subsystem; wherein,

the molecular sieve inlet air conditioning subsystem is connected with the variable multi-bed molecular sieve system and is used for conditioning gas according to measurement parameters and providing inlet air meeting the test requirements for the variable multi-bed molecular sieve system; the measured parameters comprise the pressure, the flow rate, the temperature and the humidity of the gas to be set;

the variable multi-bed molecular sieve system is connected with the vacuum cabin subsystem and the test regulation subsystem and is used for receiving inlet air transmitted by the molecular sieve inlet air regulation subsystem, controlling adsorption and desorption of each molecular sieve bed according to test requirements, adsorbing nitrogen in the inlet air by the molecular sieve bed to be adsorbed to obtain oxygen-enriched gas, transmitting the oxygen-enriched gas to the test subsystem, desorbing the nitrogen adsorbed in the molecular sieve bed to be desorbed and transmitting the nitrogen to the vacuum cabin subsystem;

the vacuum chamber subsystem is used for collecting the nitrogen;

and the testing subsystem is used for receiving the oxygen-enriched gas and acquiring performance parameters representing the performance of the molecular sieve according to the oxygen-enriched gas.

Still further, the variable multi-bed molecular sieve system comprises: the device comprises a first gas pressure stabilizing cavity, six molecular sieve beds, eighteen regulating valves, six differential pressure sensors, seven adjustable sizing holes, a second gas pressure stabilizing cavity and a second gas pressure stabilizing cavity;

wherein the input end of the first gas pressure stabilizing cavity is connected with the molecular sieve inlet air conditioning subsystem, the output end of the first gas pressure stabilizing cavity is connected with one end of first to sixth regulating valves, one end of seventh to twelfth regulating valves is connected with the vacuum cabin subsystem, the other ends of the first and seventh regulating valves are connected with one end of a first molecular sieve bed, the other end of the first molecular sieve bed is connected with one end of a thirteenth regulating valve, the first pressure difference sensor is connected with the first molecular sieve bed in parallel, the other ends of the second and eighth regulating valves are connected with one end of a second molecular sieve bed, the other end of the second molecular sieve bed is connected with one end of a fourteenth regulating valve, the second pressure difference sensor is connected with the second molecular sieve bed in parallel, and the other ends of the third and ninth regulating valves are connected with one end of the third molecular sieve bed, the other end of the third molecular sieve bed is connected with one end of a fifteenth regulating valve, a third differential pressure sensor is connected with the third molecular sieve bed in parallel, the other ends of the fourth and tenth regulating valves are connected with one end of the fourth molecular sieve bed, the other end of the fourth molecular sieve bed is connected with one end of a sixteenth regulating valve, a fourth differential pressure sensor is connected with the fourth molecular sieve bed in parallel, the other ends of the fifth and eleventh regulating valves are connected with one end of the fifth molecular sieve bed, the other end of the fifth molecular sieve bed is connected with one end of a seventeenth regulating valve, a fifth differential pressure sensor is connected with the fifth molecular sieve bed in parallel, the other ends of the sixth and twelfth regulating valves are connected with one end of the sixth molecular sieve bed, the other end of the sixth molecular sieve bed is connected with one end of an eighteenth regulating valve, and the sixth differential pressure sensor is connected with the sixth molecular sieve bed in parallel, the other ends of the thirteenth to fifteenth regulating valves are connected with the input end of the second gas pressure stabilizing cavity, the other ends of the sixteenth to eighteenth regulating valves are connected with the input end of the third gas pressure stabilizing cavity, the output ends of the second and third gas pressure stabilizing cavities are both connected with the testing subsystem, one end of a first adjustable sizing hole is arranged between the first molecular sieve bed and the thirteenth regulating valve, the other end of the first adjustable sizing hole is arranged between the second molecular sieve bed and the fourteenth regulating valve, one end of a second adjustable sizing hole is arranged between the first molecular sieve bed and the thirteenth regulating valve, the other end of the second adjustable sizing hole is arranged between the third molecular sieve bed and the fifteenth regulating valve, one end of the third adjustable sizing hole is arranged between the second molecular sieve bed and the fourteenth regulating valve, and the other end of the third adjustable sizing hole is arranged between the third molecular sieve bed and the fifteenth regulating valve, the one end setting of fourth adjustable sizing hole is in the third molecular sieve bed with between the fifteenth governing valve, the other end sets up fourth molecular sieve bed with between the sixteenth governing valve, the one end setting of fifth adjustable sizing hole is in fourth molecular sieve bed with between the sixteenth governing valve, the other end sets up fifth molecular sieve bed with between the seventeenth governing valve, the one end setting of sixth adjustable sizing hole is in fourth molecular sieve bed with between the sixteenth governing valve, the other end sets up sixth molecular sieve bed with between the eighteenth governing valve, the one end setting of seventh adjustable sizing hole is in fifth molecular sieve bed with between the seventeenth governing valve, the other end setting is in sixth molecular sieve bed with between the eighteenth governing valve.

Still further, the molecular sieve inlet air conditioning subsystem comprises: an air compressor, an air storage tank, a control valve, a dryer, a filter, a pressure regulator including a pressure sensor, a flow regulator including a flow sensor, a heater, a refrigerator, three temperature sensors, a humidity adjusting device including a humidity sensor, and a three-way valve,

the outlet end of the air compressor is connected with the input end of the air storage tank, the output end of the air storage tank is connected with one end of the control valve, the other end of the control valve is connected with the input end of the dryer, the output end of the dryer is connected with the input end of the filter, the output end of the filter is connected with one end of the pressure regulator, the other end of the pressure regulator is connected with one end of the flow regulator, the other end of the flow regulator is connected with the first end of the three-way valve, the second end of the three-way valve is connected with the input end of the heater, the third end of the three-way valve is connected with the input end of the refrigerator, the output end of the heater is connected with one end of the first temperature sensor, the output end of the refrigerator is connected with one end of the second temperature sensor, and the other ends of the first temperature sensor and the second temperature sensor are connected with one end of the third temperature sensor, the other end of the third temperature sensor is connected with the humidity adjusting device, and the other end of the humidity adjusting device is connected with the variable multi-bed molecular sieve system.

Still further, the vacuum chamber subsystem comprises: the device comprises a vacuum cabin, an adjusting valve and a vacuum pump, wherein one end of the vacuum cabin is connected with the variable multi-bed molecular sieve system, the other end of the vacuum cabin is connected with one end of the adjusting valve, and the other end of the adjusting valve is connected with the vacuum pump.

Still further, the test subsystem includes: the device comprises a pressure sensor, a flow sensor, an air flow regulating valve, a sampling micro flow regulating valve and an oxygen concentration tester;

one end of the gas flow regulating valve is connected with the variable multi-bed molecular sieve system, the other end of the gas flow regulating valve is connected with one end of the flow sensor, the other end of the flow sensor is respectively connected with the pressure sensor and one end of the sampling micro flow regulating valve, and the other end of the sampling micro flow regulating valve is connected with the oxygen concentration tester.

Furthermore, the testing subsystem further comprises a monitoring display device, and the monitoring display device is used for displaying relevant performance parameters measured by the pressure sensor, the flow sensor and the oxygen concentration tester, data monitored in the molecular sieve inlet air conditioning subsystem and data monitored by each differential pressure sensor in the variable multi-bed molecular sieve system.

Furthermore, the monitoring display device is also used for acquiring various test parameters input by a user and transmitting the test parameters to the molecular sieve inlet air conditioning subsystem.

Furthermore, the monitoring display device is also used for determining the circulation logic of the molecular sieve bed according to the test requirement and controlling the opening and closing of each regulating valve.

Still further, the regulator valve includes a solenoid valve.

Still further, the pressure regulator is a gas pressure controller.

Compared with the related art, the device for testing the comprehensive performance of the airborne multi-bed molecular sieve provided by the invention has the following beneficial effects: the device for testing the comprehensive performance of the airborne multi-bed molecular sieve comprises a molecular sieve inlet air conditioning subsystem, a variable multi-bed molecular sieve system, a vacuum cabin subsystem and a testing subsystem, wherein the molecular sieve inlet air conditioning subsystem is used for conditioning gas according to measured parameters and providing inlet air meeting testing requirements for the variable multi-bed molecular sieve system, the variable multi-bed molecular sieve system is used for receiving the inlet air transmitted by the molecular sieve inlet air conditioning subsystem, controlling adsorption and desorption of each molecular sieve bed according to the testing requirements, adsorbing nitrogen in the inlet air by the molecular sieve bed to be adsorbed to obtain oxygen-enriched gas and nitrogen-enriched gas, transmitting the oxygen-enriched gas to the testing subsystem and transmitting the nitrogen-enriched gas to the vacuum cabin subsystem, and the variable multi-bed molecular sieve system can realize the performance testing of various sieve bed logics by controlling the switching sequence of a regulating valve, the vacuum chamber subsystem is used for collecting nitrogen-rich gas, and the testing subsystem is used for receiving the oxygen-rich gas and acquiring performance parameters representing the performance of the molecular sieve according to the oxygen-rich gas. Thus, by the testing device, inlet air parameters required by testing the molecular sieve can be adjusted through the molecular sieve inlet air adjusting subsystem, inlet air meeting testing requirements is provided for the variable multi-bed molecular sieve system, the variable multi-bed molecular sieve system controls adsorption and desorption of each molecular sieve bed according to the testing requirements, inlet air is adsorbed through the molecular sieve bed to be adsorbed to generate oxygen-enriched gas, and the testing subsystem can test the oxygen-enriched gas generated by the molecular sieve system to obtain required performance parameters. The testing device can test and evaluate the oxygen production performance of the molecular sieve oxygen production equipment under different sieve bed logics and different inlet air parameters, and is favorable for development and development of related products.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a schematic structural diagram of a device for testing the comprehensive performance of an airborne multi-bed molecular sieve according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of another apparatus for testing the comprehensive performance of an airborne multi-bed molecular sieve according to an embodiment of the present invention;

figure 3 is a schematic diagram of the structure of the variable multi-bed molecular sieve system shown in figure 1.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In order to effectively explain embodiments of the present invention, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1, an embodiment of the present invention provides an apparatus for testing overall performance of an airborne multi-bed molecular sieve, including: a molecular sieve inlet air conditioning subsystem 1, a variable multi-bed molecular sieve system 2, a vacuum cabin subsystem 3 and a testing subsystem 4.

The molecular sieve inlet air conditioning subsystem 1 is connected with the variable multi-bed molecular sieve system 2, and is used for measuring parameter conditioning gas and providing inlet air meeting testing requirements for the variable multi-bed molecular sieve system 2.

Wherein, the measured parameters comprise the pressure, and/or the flow rate, and/or the temperature, and/or the humidity of the gas to be set.

The variable multi-bed molecular sieve system 2 is connected with the vacuum cabin subsystem 3 and the test regulation subsystem 4 and is used for receiving inlet air transmitted by the molecular sieve inlet air regulation subsystem 1, controlling adsorption and desorption of each molecular sieve bed according to test requirements, adsorbing nitrogen in the inlet air through the molecular sieve bed to be adsorbed to obtain oxygen-enriched gas, transmitting the oxygen-enriched gas to the test subsystem 4, desorbing the nitrogen adsorbed in the molecular sieve bed to be desorbed and transmitting the nitrogen to the vacuum cabin subsystem 3.

And the vacuum chamber subsystem 3 is used for collecting nitrogen.

And the test subsystem 4 is used for receiving the oxygen-enriched gas and acquiring performance parameters representing the performance of the molecular sieve according to the oxygen-enriched gas.

Specifically, the measurement parameter is an inlet air parameter set by a user and required for the variable multi-bed molecular sieve system 2, the molecular sieve inlet air conditioning subsystem 1 obtains the measurement parameter, and adjusts the gas according to the measurement parameter, that is, the pressure, and/or flow rate, and/or temperature, and/or humidity of the gas are adjusted according to the measurement parameter, the adjusted gas is the inlet air required by the variable multi-bed molecular sieve system 2 and meeting the test requirement, and the molecular sieve inlet air conditioning subsystem 1 transmits the inlet air to the variable multi-bed molecular sieve system 2.

After receiving the air at the inlet of the molecular sieve inlet air conditioning subsystem 1, the variable multi-bed molecular sieve system 2 controls the adsorption and desorption of each molecular sieve bed according to the test requirements, namely determines the molecular sieve bed to be adsorbed and the molecular sieve bed to be desorbed according to the test requirements, and obtains oxygen-enriched gas by adsorbing the nitrogen in the air at the inlet through the molecular sieve bed to be adsorbed. The oxygen-enriched gas is transmitted to the testing subsystem 4 for corresponding performance testing to determine the performance of the molecular sieve in the variable multi-bed molecular sieve system 2. And desorbing the nitrogen adsorbed in the molecular sieve bed to be desorbed, and transmitting the nitrogen to the vacuum cabin subsystem 3 for exhausting.

The vacuum chamber subsystem 3 collects the nitrogen adsorbed by the variable multi-bed molecular sieve system 2 into the vacuum chamber subsystem for removal.

After receiving the oxygen-enriched gas, the testing subsystem 4 tests the oxygen-enriched gas to obtain various performance parameters, such as pressure, flow rate, oxygen concentration and the like of the oxygen-enriched gas, so as to represent the performance of the molecular sieve to be tested in the variable multi-bed molecular sieve system 2 through the performance parameters.

Thus, by the testing device of the invention, inlet air parameters required by testing the molecular sieve can be adjusted by the molecular sieve inlet air conditioning subsystem, inlet air meeting testing requirements is provided for the variable multi-bed molecular sieve system, the variable multi-bed molecular sieve system controls adsorption and desorption of each molecular sieve bed according to the testing requirements, inlet air transmitted by the inlet air conditioning subsystem is adsorbed by the molecular sieve bed to be adsorbed, oxygen-enriched gas is generated, and the oxygen-enriched gas generated by the variable multi-bed molecular sieve system is tested by the testing device, so that required performance parameters are obtained. The performance of the molecular sieve oxygen generation equipment can be tested through the testing device, the understanding of the molecular sieve oxygen generation equipment is improved, and the development of related products are facilitated.

Further, as shown in fig. 2, the molecular sieve inlet air conditioning subsystem 1 comprises: an air compressor 10, an air tank 11, a control valve 12, a dryer 13, a filter 14, a pressure regulator 15 including a pressure sensor, a flow regulator 16 including a flow sensor, a heater 17a, a refrigerator 17b, three temperature sensors 18a to 18c, a humidity adjusting device 19 including a humidity sensor, and a three-way valve 20.

Wherein, the outlet end of the air compressor 10 is connected with the input end of the air storage tank 11, the output end of the air storage tank 11 is connected with one end of the control valve 12, the other end of the control valve 12 is connected with the input end of the dryer 13, the output end of the dryer 13 is connected with the input end of the filter 14, the output end of the filter 14 is connected with one end of the pressure regulator 15, the other end of the pressure regulator 15 is connected with one end of the flow regulator 16, the other end of the flow regulator 16 is connected with the first end of the three-way valve 20, the second end of the three-way valve 20 is connected with the input end of the heater 17a, the third end of the three-way valve 20 is connected with the input end of the refrigerator 17b, the output end of the heater 17a is connected with one end of the first temperature sensor 18a, the output end of the refrigerator 17b is connected with one end of the second temperature sensor 18b, the other ends of the first temperature sensor 18a and the second temperature sensor 18b are connected with one end of the third temperature sensor 18c, the other end of the third temperature sensor 18c is connected to a humidity adjusting device 19, and the other end of the humidity adjusting device 19 is connected to the variable multi-bed molecular sieve system 2.

Specifically, air compressor 10 compresses the air and produces high-pressure air, and air compressor 10 transmits high-pressure air to in the gas holder 11, stores a certain amount of compressed air in the gas holder 11 like this, can reduce the fluctuation of air pressure in order to ensure that the air feed is steady for variable multi-bed molecular sieve system 2. The output end of the air storage tank 11 is connected with the control valve 12, and the high-pressure air is transmitted to the control valve 12 through the output end. The control valve 12 can control the on-off of the air supply, and when the air supply is needed for the variable multi-bed molecular sieve system 2, the control valve 12 can be opened, so that the high-pressure air stored in the air storage tank 11 can be transmitted to the subsequent devices. When there is no need to supply air to the variable multi-bed molecular sieve system 2, the control valve 12 may be closed so that the high pressure air stored in the air tank 11 cannot be transmitted to subsequent devices.

After the control valve 12 is opened, the high-pressure air is first delivered to the dryer 13 through the control valve 12. Drying treatment is carried out in the dryer 13 so as to dehumidify the high-pressure air, the high-pressure air dried by the dryer 13 is transmitted to the filter 14, and the filter 14 filters the high-pressure air to filter impurities in the high-pressure air so as to obtain dry and clean high-pressure air. The output end of the filter 14 is connected to one end of a pressure regulator 15, when the pressure of the high-pressure air is required to be regulated, and the high-pressure air is transmitted to the pressure regulator 15 through the output end of the filter 14, the pressure regulator 15 regulates the pressure of the high-pressure air as required, and meanwhile, a pressure sensor in the pressure regulator 15 measures the pressure of the air therein in real time. If there is no need to adjust the pressure of the high pressure air, the pressure regulator 15 measures the pressure of the high pressure air only by the pressure sensor and does not perform other operations while the high pressure air is transmitted to the pressure regulator 15 through the output end of the filter 14. Whether the pressure regulator 15 needs to regulate the pressure of the high-pressure air or not needs to be known according to the acquired test parameters, and if the set value of the air pressure exists in the test parameters, the pressure regulator 15 needs to regulate the pressure of the high-pressure air according to the set value of the air pressure in the test parameters so as to regulate the pressure of the high-pressure air to the set value of the air pressure in the test parameters.

Alternatively, the pressure regulator 15 may be an integral gas pressure controller. The gas pressure controller is integrated with the PD controller, the digital pressure sensor and the proportional solenoid valve, data transmission can be realized with the control computer through RS-485, closed-loop control is automatically carried out according to a set value of a user on the control computer, and the purpose of controlling the gas flow pressure is achieved.

After passing through the pressure regulator 15, the air enters the flow regulator 16, and likewise, when the flow regulation is required, the flow regulator 16 regulates the flow of the air as required, and the flow sensor in the flow regulator 16 measures the air flow therein in real time. If the flow rate of the air is not required to be adjusted, the flow rate of the air is measured by the flow rate sensor and no other operation is performed by the flow rate regulator 16 when the air is transmitted to the flow rate regulator 16 through the pressure regulator 15. Whether the flow regulator 16 needs to regulate the flow of the air or not needs to be known according to the acquired test parameters, and if the set value of the air flow exists in the test parameters, the flow regulator 16 needs to regulate the flow of the air according to the set value of the air flow in the test parameters so as to regulate the flow of the air to be the set value of the air flow in the test parameters.

When the flow rate controller 16 performs flow rate control, the flow rate measured by the flow meter is compared with a set value, and the opening degree of the flow rate control valve is adjusted to achieve the purpose of flow rate control.

It should be noted that, since adjusting the pressure and the flow rate at the same time easily causes a large coupling effect, in the embodiment of the present invention, the two adjustments are not performed at the same time, and only the measurement of the flow rate is performed when the pressure is adjusted, whereas only the measurement of the pressure is performed when the flow rate is adjusted.

The air needs to be temperature-regulated after passing through the flow regulator 16, the temperature regulation of the air is regulated by a heater 17a and a refrigerator 17b which are connected in parallel, temperature sensors 18a-18c are arranged at the output ends of the heater 17a and the refrigerator 17b for temperature monitoring, and the proportion of the flow of the cold and hot paths is regulated through a three-way valve 20.

That is, the three-way valve 20 has a first end connected to the flow regulator 16, a second end connected to the heater 17a, and a third end connected to the refrigerator 17b, so that the flow rate into the heater 17a and the refrigerator 17b can be controlled by controlling the opening and closing of the three-way valve. When only the air needs to be heated, the third end of the three-way valve can be closed and only the second end can be opened, and the air is heated by the heater 17 a. When only air needs to be cooled, the second end of the three-way valve may be closed and only the third end may be opened to cool the air by the refrigerator 17 b. When the air needs to be adjusted to a certain temperature, the valve openings at the third end and the second end can be adjusted to control the flow rates flowing into the heater 17a and the refrigerator 17b, so that the air heated by the heater 17a and the air cooled by the refrigerator 17b are mixed to reach the required temperature. A first temperature sensor 18a is provided at the heater 17a for measuring the temperature of the air heated by the heater 17a, a second temperature sensor 18b is provided at the refrigerator 17b for measuring the temperature of the air cooled by the refrigerator 17b, and a third temperature sensor 18c is provided at a location where the air heated by the heater 17a is mixed with the air cooled by the refrigerator 17b so as to measure the temperature of the mixed air.

That is, the heater 17a and the refrigerator 17b are installed in parallel, the refrigerator 17b and the heater 17a are respectively in separate loops, the opening degrees of the second end and the third end of the three-way valve are calculated through a digital PID function according to the set temperature of the air, the flow rates of the air entering the refrigerator 17b and the heater 17a are adjusted by controlling the opening degrees of the three-way valve, and the cold and hot air with different proportions is mixed at the rear end to achieve the effect of controlling the temperature of the airflow at the inlet of the molecular sieve.

It should be noted that the calculation of the opening degrees of the second end and the third end of the three-way valve by the set temperature of the air through the digital PID function may be performed by a control computer, which may be user-oriented, and the opening degrees of the second end and the third end of the three-way valve may be automatically calculated through the digital PID function when the temperature of the gas entering the variable multi-bed molecular sieve system for setting is received.

After the temperature adjustment is completed, the gas is measured by the third temperature sensor 18c and then transmitted to the humidity adjusting device 19, and the humidity adjusting device 19 can adjust the humidity of the gas according to the humidity value set by the test parameter. The humidity adjusting device 19 includes a high pressure steam boiler, a pneumatic membrane adjusting valve and a controller. The main mode of humidity control is that a high-pressure steam boiler is additionally arranged on an inlet pipeline, a pneumatic film regulating valve is additionally arranged on a connecting pipeline between the boiler and the inlet pipeline, a controller outputs corresponding valve opening degree through PID conversion according to the difference between a measured value and a set value of a hygrometer, the opening degree of the pneumatic film regulating valve is controlled according to the calculated valve opening degree, the adjustment of the water vapor flow of an inlet pipeline of the boiler is realized, closed-loop control is formed, and the aim of humidity adjustment is fulfilled. Of course, the humidity control device 19 may not include a controller, and the opening of the control valve is manually controlled by a potentiometer on the control cabinet panel to achieve the purpose of humidity control, which is not limited in the present invention. The humidity conditioning device 19 sends the conditioned gas, i.e., the inlet air meeting the testing requirements of the variable multi-bed molecular sieve system 2, to the variable multi-bed molecular sieve system 2.

As shown in fig. 3, the variable multi-bed molecular sieve system 2 includes: a first gas pressure stabilizing cavity 21, six molecular sieve beds 24a-24f, eighteen regulating valves 22a-22r, six differential pressure sensors 23a-23f, seven adjustable diameter holes 25a-25g, a second gas pressure stabilizing cavity 26 and a second gas pressure stabilizing cavity 27.

Wherein, the input end of a first gas pressure stabilizing cavity 21 is connected with the molecular sieve inlet air conditioning subsystem 1, the output end of the first gas pressure stabilizing cavity 21 is connected with one end of a first to a sixth regulating valves 22a-22f, one end of a seventh to a twelfth regulating valves 22g-22l is connected with the vacuum cabin subsystem 3, the other ends of the first and the seventh regulating valves 22a, 22g are connected with one end of a first molecular sieve bed 24a, the other end of the first molecular sieve bed 24a is connected with one end of a thirteenth regulating valve 22m, a first differential pressure sensor 23a is connected with the first molecular sieve bed 24a in parallel, the other ends of a second and an eighth regulating valves 22b, 22h are connected with one end of a second molecular sieve bed 24b, the other end of the second molecular sieve bed 24b is connected with one end of a fourteenth regulating valve 22n, and a second differential pressure sensor 23b is connected with the second molecular sieve bed 24b in parallel, the other ends of the third and ninth adjusting valves 22c, 22i are connected to one end of a third molecular sieve bed 24c, the other end of the third molecular sieve bed 24c is connected to one end of a fifteenth adjusting valve 22o, and a third differential pressure sensor 23c is connected in parallel to the third molecular sieve bed 24c, the other ends of the fourth and tenth adjusting valves 22d, 22j are connected to one end of a fourth molecular sieve bed 24d, the other end of the fourth molecular sieve bed 24d is connected to one end of a sixteenth adjusting valve 22p, and a fourth differential pressure sensor 23d is connected in parallel to the fourth molecular sieve bed 24d, the other ends of the fifth and eleventh adjusting valves 22e, 22k are connected to one end of a fifth molecular sieve bed 24e, the other end of the fifth molecular sieve bed 24e is connected to one end of a seventeenth adjusting valve 22q, and a fifth differential pressure sensor 23e is connected in parallel to the fifth molecular sieve bed 24e, the other ends of the sixth and twelfth adjusting valves 22f, 22l are connected to one end of a sixth molecular sieve bed 24f, the other end of a sixth molecular sieve bed 24f is connected with one end of an eighteenth regulating valve 22r, a sixth differential pressure sensor 23f is connected with the sixth molecular sieve bed 24f in parallel, the other ends of thirteenth to fifteenth regulating valves 22m-22o are connected with the input end of a second gas pressure stabilizing cavity 26, the other ends of sixteenth to eighteenth regulating valves 22p-22r are connected with the input end of a third gas pressure stabilizing cavity 27, the output ends of the second gas pressure stabilizing cavity 26 and the third gas pressure stabilizing cavity 27 are both connected with the testing subsystem 4, one end of a first adjustable sizing hole 25a is arranged between the first molecular sieve bed 24a and the thirteenth regulating valve 22m, the other end is arranged between the second molecular sieve bed 24b and the fourteenth regulating valve 22n, one end of a second adjustable sizing hole 25b is arranged between the first molecular sieve bed 24a and the thirteenth regulating valve 22m, and the other end is arranged between the third molecular sieve bed 24c and the fifteenth regulating valve 22o, one end of a third adjustable sizing hole 25c is arranged between the second molecular sieve bed 24b and the fourteenth regulating valve 22n, the other end is arranged between the third molecular sieve bed 24c and the fifteenth regulating valve 22o, one end of a fourth adjustable sizing hole 25d is arranged between the third molecular sieve bed 24c and the fifteenth regulating valve 22o, the other end is arranged between the fourth molecular sieve bed 24d and the sixteenth regulating valve 22p, one end of a fifth adjustable sizing hole 25e is arranged between the fourth molecular sieve bed 24d and the sixteenth regulating valve 22p, the other end is arranged between the fifth molecular sieve bed 24e and the seventeenth regulating valve 22q, one end of a sixth adjustable sizing hole 25f is arranged between the fourth molecular sieve bed 24d and the sixteenth regulating valve 22p, the other end is arranged between the sixth molecular sieve bed 24f and the eighteenth regulating valve 22r, one end of a seventh adjustable sizing hole 25g is arranged between the fifth molecular sieve bed 24e and the seventeenth regulating valve 22q, the other end is disposed between the sixth molecular sieve bed 24f and the eighteenth regulating valve 22 r.

Specifically, the first gas pressure stabilizing cavity 21 is connected with the molecular sieve inlet air conditioning subsystem 1, namely connected with the humidity adjusting device 19. In this way, the first gas plenum 21 may pre-store inlet air delivered by the humidifier 19 and store it to reduce fluctuations in gas pressure and provide stable gas for subsequent molecular sieve beds.

It should be noted that although six molecular sieve beds 24a-24e are included in the application, in the actual testing process, all of the six molecular sieve beds are working and can be used for different oxygen generation tests of sieve bed cycle logic, such as the two-bed oxygen generation test, the three-bed oxygen generation test and the six-bed oxygen generation test, which are described below. Of course, other cycle logics can be used for oxygen generation tests, and the cycle logics can be set according to actual test requirements, which is not limited in the application.

It should be noted that, according to the testing device of the present application, the molecular sieve beds can also only make two molecular sieve beds generate oxygen, or only use three molecular sieve beds to generate oxygen, or only be suitable for four molecular sieve beds to generate oxygen, etc., and the number of the molecular sieve beds that can work can be set according to actual needs, which is not limited in the present application.

In the application, the characteristics of the molecular sieve are mainly tested, and by utilizing the adsorption characteristics of the molecular sieve, nitrogen with stronger polarity in the gas is adsorbed by the molecular sieve to form oxygen-enriched gas. The pressure swing adsorption cycle consists of four basic processes, namely pressure boosting, adsorption, pressure reduction, and desorption. In operation bleed air from the molecular sieve inlet air conditioning subsystem 1 enters the molecular sieve bed via the first gas plenum 21. Referring to fig. 3, there are 6 sieve beds in total 24a-24 f. The application can test various experimental logics of the molecular sieve beds, the oxygen generation test can be performed by using a two-bed circulation logic, a three-bed circulation logic and a six-bed circulation logic in the following embodiments, the oxygen generation test of other logics can refer to the oxygen generation test described below, and the application is not repeated.

When a two-bed circulation logic oxygen production test of the molecular sieve beds is required, every two molecular sieve beds of 6 molecular sieve beds are in one group, and every group has one molecular sieve bed to produce gas and one molecular sieve to desorb gas in each circulation period. In the first phase of operation, assume a group of

molecular sieve beds

24a, 24b, a group of 24c, 24d, and a group of 24e, 24 f. During oxygen generation test, if the molecular sieve bed 24a produces gas, the molecular sieve bed 24b desorbs gas, the molecular sieve bed 24c produces gas, the molecular sieve bed 24d desorbs gas, the molecular sieve bed 24e produces gas, the molecular sieve bed 24f desorbs gas, the regulating

valves

22a, 22h, 22c, 22j, 22e and 22l are opened, and the rest regulating valves are closed. In a first operating phase, the valves of the

control valves

22a, 22h, 22c, 22j, 22e, 22l are open and the remaining valves are closed. The gas in the first gas pressure stabilizing cavity 21 enters the

molecular sieve beds

24a, 24c and 24e through the regulating

valves

22a, 22c and 22e, the

molecular sieve beds

24a, 24c and 24e are pressurized, the valves of the regulating

valves

22h, 22j and 22l are opened, so that the

molecular sieve beds

24b, 24d and 24f are communicated with the vacuum cabin subsystem 3, the pressure of the

molecular sieve beds

24b, 24d and 24f is reduced, and the pressure can be measured by the pressure difference sensors 23a to 23f on the two sides of each sieve bed. In the second stage of the operation, the valves of the regulating

valves

22m, 22o and 22q are opened, the

molecular sieve beds

24a, 24c and 24e adsorb the gas transmitted into the molecular sieve beds, the

molecular sieve beds

24b, 24d and 24f desorb the nitrogen adsorbed in the molecular sieve beds, the

molecular sieve beds

24a, 24c and 24e generate oxygen-enriched gas, most of the oxygen-enriched gas enters the second gas pressure stabilizing cavity 26 and the third gas pressure stabilizing cavity 27 through the regulating

valves

22m, 22o and 22q respectively, and is sent to the measurement subsystem 4 through the second gas pressure stabilizing cavity 26 and the third gas pressure stabilizing cavity 27. A small part of the gas enters the

molecular sieve beds

24b, 24d and 24f through the adjustable-diameter holes 25a-25f, nitrogen adsorbed in the

molecular sieve beds

24b, 24d and 24f is desorbed and enters the vacuum chamber subsystem 3 through the

valves

22h, 22j and 22l for collection, and the pressure drop in the adsorption and desorption processes can be measured by the pressure difference sensors 23a-23f installed on the molecular sieve beds. The four processes are circularly carried out at a certain time frequency, and two beds and a group of beds are alternately operated to realize continuous oxygen production. That is, the molecular sieve bed that produces gas in this cycle is changed to a molecular sieve bed that desorbs gas in the next cycle. For example, the gas produced in this cycle is 24a, 24c, 24e, the desorbed sieve beds are 24b, 24d, 24f, the gas converted in the next cycle is 24b, 24d, 24f, and the desorbed sieve beds are 24a, 24c, 24 e.

In the above process, the pressure reduction of the molecular sieve bed is realized by opening the regulating valve to communicate the molecular sieve bed with the vacuum chamber subsystem. According to the pressure swing adsorption principle, the low pressure is favorable for nitrogen desorption to improve oxygen concentration, and the vacuum chamber subsystem is used for collecting nitrogen, so that the pressure in the vacuum chamber subsystem can be reduced through the vacuum pump, and the purpose of reducing the pressure at the molecular sieve bed is achieved. The gas generated at the air conditioning subsystem at the molecular sieve inlet is high-pressure gas, and the pressure in the molecular sieve bed can be increased after the gas enters the molecular sieve bed, so that the purpose of pressurization is achieved. The desorption is to release the nitrogen adsorbed in the molecular sieve bed.

When a three-bed circulation logic oxygen production test of the molecular sieve beds is required, every three of the 6 molecular sieve beds are in one group, and each group is provided with two molecular sieve beds for producing gas and one molecular sieve bed for desorption. Assume that the

molecular sieve beds

24a, 24b, 24c are grouped together and 24d, 24e, 24f are grouped together. On the start of a small cycle of the first cycle, the valves of the

valves

22a, 22b, 22i, 22d, 22e, 22l are open and the remaining valves are closed during the first phase of operation of the small cycle. The gas in the first gas plenum chamber 21 passes through the modulating

valves

22a, 22b, 22d, 22e and enters the

molecular sieve beds

24a, 24b, 24d, 24e, and the

molecular sieve beds

24a, 24b, 24d, 24e are pressurized. The valves of the regulator valves 22i, 22l are opened to place the vacuum chamber subsystem in communication with the

molecular sieve beds

24c, 24f, and the

molecular sieve beds

24c, 24f are depressurized, the pressure of which can be measured by the differential pressure sensors 23a-23f on either side of each molecular sieve bed. Valves of the adjusting

valves

22m, 22n, 22p and 22q in the second stage working in the small period are opened, the

molecular sieve beds

24a, 24b, 24d and 24e adsorb gas transmitted into the molecular sieve beds, the

molecular sieve beds

24c and 24f desorb nitrogen adsorbed by the molecular sieves in the molecular sieve beds, most of oxygen-enriched gas generated by the

molecular sieve beds

24a, 24b, 24d and 24e respectively enters the second gas pressure stabilizing cavity 26 and the third gas pressure stabilizing cavity 27 through the adjusting

valves

22m, 22n, 22p and 22q, and is sent to the measurement subsystem 4 through the second gas pressure stabilizing cavity 26 and the third gas pressure stabilizing cavity 27. A small part of the gas enters the

molecular sieve beds

24c and 24f through the adjustable-diameter holes 25a to 25f, nitrogen adsorbed in the

molecular sieve beds

24c and 24f is desorbed and enters the vacuum cabin subsystem 3 for collection through the adjusting valves 22i and 22l, and the pressure drop in the adsorption and desorption processes can be measured by the pressure difference sensors 23a to 23f installed on the molecular sieve beds. When entering the second cycle for a short period, similar to the principle of the previous stage, the

molecular sieve beds

24b, 24c and 24e, 24f adsorb oxygen and 24a and 24d desorb oxygen by controlling the opening and closing of the regulating valves 22a-22 r. And entering a third cycle short period, and controlling the opening and closing of the regulating valves 22a-22r to ensure that the

molecular sieve beds

24c and 24a and 24f and 24d adsorb and generate oxygen and the

molecular sieve beds

24b and 24e desorb. Every three small periods form a large cycle period cycle, wherein the period interval time is adjustable.

When a six-bed circulation logic oxygen production test of the molecular sieve beds is required, three molecular sieve beds generate gas in each small circulation period and three molecular sieve beds desorb gas by controlling the opening and closing sequence of the regulating valves 22a-22 r; when one small cycle period is over to another small cycle period, one molecular sieve bed stops producing gas and starts desorbing, the other molecular sieve bed stops desorbing and starts producing gas, and according to the cycle, 6 small cycles form a large cycle period, the cycle is carried out, wherein the interval time of the cycle is adjustable. The specific gas production and desorption processes can refer to the oxygen production test of the two-bed and three-bed molecular sieve beds, and are not described herein again.

Alternatively, the regulator valves 22a-22r may be solenoid valves.

The subsystem can control the opening and closing sequence of each regulating valve through a control computer, the adsorption and desorption logic cycle period of any multi-bed molecular sieve bed is tested in a similar mode, the period interval time can be adjusted by controlling the opening and closing time interval of each regulating valve, and the sizes of the adjustable sizing holes 25a-25f can be adjusted according to actual requirements.

As shown in fig. 2, the vacuum chamber subsystem 3 includes: the device comprises a vacuum chamber 31, an adjusting valve 32 and a vacuum pump 33, wherein one end of the vacuum chamber 31 is connected with the variable multi-bed molecular sieve system 2, the other end of the vacuum chamber is connected with one end of the adjusting valve 32, and the other end of the adjusting valve is connected with the vacuum pump 33.

Specifically, the vacuum chamber subsystem 3 is mainly used for collecting nitrogen, and the vacuum pump 33 controls the regulating valve 32 to control the vacuum degree in the vacuum chamber 31 to a target value. The vacuum chamber 31 is connected to each of the molecular sieve beds 24a to 24f through the control valves 22g to 22l in the variable multi-bed molecular sieve system 2, and can collect nitrogen desorbed from each of the molecular sieve beds to increase the oxygen concentration of each of the molecular sieve beds 24a to 24 f.

As shown in fig. 2, the test subsystem 4 includes: a pressure sensor 41, a flow sensor 42, an air flow rate regulating valve 43, a sampling micro flow rate regulating valve 44, and an oxygen concentration meter 45.

One end of the air flow control valve 43 is connected to the variable multi-bed molecular sieve system 2, the other end is connected to one end of the flow sensor 42, the other end of the flow sensor 42 is connected to one end of the pressure sensor 41 and one end of the sampling micro flow control valve 44, respectively, and the other end of the sampling micro flow control valve 44 is connected to the oxygen concentration meter 45.

Specifically, the test subsystem 4 is composed of a pressure sensor 41, a flow sensor 42, an air flow regulating valve 43, a sampling micro flow regulating valve 44, and an oxygen concentration tester 45. The gas flow regulating valve 43 is connected with the second gas pressure stabilizing cavity 26 and the third gas pressure stabilizing cavity 27 in the variable multi-bed molecular sieve system 2, and oxygen-enriched gas generated by the variable multi-bed molecular sieve system 2 is subjected to pressure stabilization through the second gas pressure stabilizing cavity 26 and the third gas pressure stabilizing cavity 27 and then is transmitted to the gas flow regulating valve 43 to enter the testing subsystem 4. The testing subsystem 4 controls the flow of the oxygen-enriched gas into the testing subsystem 4 through the gas flow regulating valve 43, tests the flow of the oxygen-enriched gas into the testing subsystem 4 through the flow sensor 42, tests the pressure of the oxygen-enriched gas through the pressure sensor 41, and tests the oxygen content in the oxygen-enriched gas through the oxygen concentration tester 45. The test subsystem 4 can test the variation in oxygen production and oxygen production concentration of the variable multi-bed molecular sieve system 2 under different test parameters.

In addition, the testing subsystem 4 also needs to collect the measurement data of the pressure sensor in the pressure regulator 15, the flow sensor in the flow regulator 16, the temperature sensor 18c, the humidity sensor in the humidity regulating device 19 and the pressure difference sensors 23a-23f in the variable multi-bed molecular sieve system 2 in the molecular sieve inlet air conditioning subsystem 1, so as to determine the testing conditions of each molecular sieve bed in the testing process, including air supply flow, air supply pressure, air supply temperature, air supply humidity and the pressure difference between the molecular sieve inlet and the molecular sieve outlet.

Further, the test subsystem further includes: the display device is monitored. And the monitoring display device is used for displaying relevant performance parameters measured by the pressure sensor 41, the flow sensor 42 and the oxygen concentration tester 45, data monitored in the molecular sieve inlet air conditioning subsystem 1 and data monitored by the differential pressure sensors 23a-23f in the variable multi-bed molecular sieve system 2.

The data monitored in the molecular sieve inlet air conditioning subsystem 1 are the data measured by the pressure sensor in the pressure regulator 15, the flow sensor in the flow regulator 16, the temperature sensor 18c and the humidity sensor in the humidity regulating device 19 in the molecular sieve inlet air conditioning subsystem 1. That is, the data tested by each subsystem can be displayed to the user in real time by monitoring the display device, so that the user can know the testing process of the molecular sieve.

Further, the monitoring display device is further configured to obtain each test parameter input by the user, and transmit the test parameter to the molecular sieve inlet air conditioning subsystem 1.

That is, the monitoring display device may be user-oriented, and at this time, each parameter value of the high-pressure gas that the user may input to the monitoring display device is the test parameter input by the user, and the monitoring display device may transmit the received test parameter to the molecular sieve inlet air conditioning subsystem 1.

And the monitoring display device is also used for determining the circulating logic of the molecular sieve bed according to the test requirement and controlling the opening and closing of each regulating valve.

That is, the control computer described in the above embodiment may be integrated in the monitoring display device, that is, the control computer determines the cycle logic of the molecular sieve bed according to the actual test requirement, for example, determines that the molecular sieve bed is a two-bed cycle logic oxygen generation test, or a three-bed cycle logic oxygen generation test, or other bed cycle logic oxygen generation tests, so that the opening and closing of the regulating valves 22a to 22r may be controlled according to which molecular sieve beds produce gas and which molecular sieve beds desorb, and the oxygen generation tests of different cycle logics of the molecular sieve beds are implemented.

The test device has the advantages that the test device is complete in function, high in test accuracy and certain in compatibility, can meet the performance test requirements of different models of airborne molecular sieve oxygen generation devices (two molecular sieve beds, three molecular sieve beds and six molecular sieve beds), and can realize oxygen generation and desorption of any multiple beds and cyclic logic oxygen generation tests.

The testing device can also accurately test the oxygen production effect of the oxygen generating device under the working conditions of different air supply temperatures, air supply pressures, air supply humidity, air supply flow and cabin pressures corresponding to different flight heights of the airplane, and the pressure drop in the adsorption and desorption processes; and a stable and continuous working condition environment is maintained in the testing process.

In summary, the device for testing the comprehensive performance of the airborne multi-bed molecular sieve comprises a molecular sieve inlet air conditioning subsystem, a variable multi-bed molecular sieve system, a vacuum cabin subsystem and a testing subsystem, wherein the molecular sieve inlet air conditioning subsystem is used for conditioning gas according to measurement parameters and providing inlet air meeting testing requirements for the variable multi-bed molecular sieve system, the variable multi-bed molecular sieve system is used for receiving the inlet air transmitted by the molecular sieve inlet air conditioning subsystem, controlling adsorption and desorption of each molecular sieve bed according to the testing requirements, absorbing nitrogen in the inlet air by the molecular sieve bed to be adsorbed to obtain oxygen-enriched gas and nitrogen-enriched gas, transmitting the oxygen-enriched gas to the testing subsystem and transmitting the nitrogen-enriched gas to the vacuum cabin subsystem, and the variable multi-bed molecular sieve system can realize the logic performance testing of various sieve beds by controlling the switching sequence of a regulating valve, the vacuum chamber subsystem is used for collecting nitrogen-rich gas, and the testing subsystem is used for receiving the oxygen-rich gas and acquiring performance parameters representing the performance of the molecular sieve according to the oxygen-rich gas. Thus, by the testing device, inlet air parameters required by testing the molecular sieve can be adjusted through the molecular sieve inlet air adjusting subsystem, inlet air meeting testing requirements is provided for the variable multi-bed molecular sieve system, the variable multi-bed molecular sieve system controls adsorption and desorption of each molecular sieve bed according to the testing requirements, inlet air is adsorbed through the molecular sieve bed to be adsorbed to generate oxygen-enriched gas, and the testing subsystem can test the oxygen-enriched gas generated by the molecular sieve system to obtain required performance parameters. The testing device can test and evaluate the oxygen production performance of the molecular sieve oxygen production equipment under different sieve bed logics and different inlet air parameters, and is favorable for development and development of related products.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. A testing device for comprehensive performance of an airborne multi-bed molecular sieve is characterized by comprising: the system comprises a molecular sieve inlet air conditioning subsystem, a variable multi-bed molecular sieve system, a vacuum cabin subsystem and a test subsystem; wherein,

the vacuum chamber subsystem is used for collecting the nitrogen;

the testing subsystem is used for receiving the oxygen-enriched gas and acquiring performance parameters representing the performance of the molecular sieve according to the oxygen-enriched gas;

a variable multi-bed molecular sieve system comprising: the device comprises a first gas pressure stabilizing cavity, six molecular sieve beds, eighteen regulating valves, six differential pressure sensors, seven adjustable sizing holes, a second gas pressure stabilizing cavity and a second gas pressure stabilizing cavity;

2. The testing device of claim 1, wherein the molecular sieve inlet air conditioning subsystem comprises: an air compressor, an air storage tank, a control valve, a dryer, a filter, a pressure regulator including a pressure sensor, a flow regulator including a flow sensor, a heater, a refrigerator, three temperature sensors, a humidity adjusting device including a humidity sensor, and a three-way valve,

3. The testing device of claim 1, wherein the vacuum chamber subsystem comprises: the device comprises a vacuum cabin, an adjusting valve and a vacuum pump, wherein one end of the vacuum cabin is connected with the variable multi-bed molecular sieve system, the other end of the vacuum cabin is connected with one end of the adjusting valve, and the other end of the adjusting valve is connected with the vacuum pump.

4. The test device of claim 1, wherein the test subsystem comprises: the device comprises a pressure sensor, a flow sensor, an air flow regulating valve, a sampling micro flow regulating valve and an oxygen concentration tester;

5. The testing apparatus of claim 4, wherein said testing subsystem further comprises a monitor display device for displaying said pressure sensor, said flow sensor and said oxygen concentration meter measured associated performance parameters, data monitored within said molecular sieve inlet air conditioning subsystem and data monitored by each differential pressure sensor in said variable multi-bed molecular sieve system.

6. The testing apparatus of claim 5, wherein the monitor display device is further configured to obtain various test parameters input by a user and transmit the test parameters to the molecular sieve inlet air conditioning subsystem.

7. The testing apparatus of claim 6, wherein the monitor display device is further configured to determine a cycle logic of the molecular sieve bed according to the testing requirement, and control the opening and closing of each regulating valve.

8. The testing device of claim 1, wherein the regulator valve comprises a solenoid valve.

9. The testing device of claim 2, wherein the pressure regulator is a gas pressure controller.