Sectional type efficient purging structure of molecular sieve of oxygen generator

Abstract

The utility model relates to a sectional type efficient purging structure of an oxygenerator molecular sieve, which comprises an air inlet branch pipeline and an air outlet branch pipeline which are connected to an adsorption tank A and an adsorption tank B. The air inlet branch pipeline and the air outlet branch pipeline are respectively connected with an air inlet main pipe and an air outlet main pipe. A pressure equalizing pipeline, an oxygen purging pipeline and an air purging pipeline are respectively bridged on the air outlet branch pipeline, a nitrogen discharge pipeline is also arranged on the air inlet branch pipeline, and a purging and desorption link in an oxygen production process is optimized through an air and oxygen alternate synergistic purging and desorption regeneration mechanism for the molecular sieve. Compressed air and oxygen are alternately used for purging, the oxygen self consumption rate is reduced, the oxygen production energy efficiency is improved, and the energy consumption and efficiency in a traditional desorption purging process are remarkably optimized.

Description

TECHNICAL FIELD

[0001] The utility model relates to oxygen -making equipment technical field especially relates to a segmented type high -efficient blow -wash structure of oxygen generator molecular sieve. BACKGROUND

[0002] Molecular sieve pressure swing adsorption oxygen production technology realizes oxygen-nitrogen separation through the selective adsorption characteristics of molecular sieve material to nitrogen and other gases, and the core lies in the dynamic balance of the adsorption-desorption cycle process. Under high pressure working condition, the molecular sieve produces preferential adsorption to nitrogen in compressed air, so that the oxygen component is enriched in the gas phase and output; when the system is switched to low pressure state, the molecular sieve releases the adsorbed nitrogen to complete regeneration, thereby maintaining continuous oxygen production capacity. The traditional process adopts a double-adsorption tank alternating cycle mode, and the molecular sieve is regenerated by blow washing with product oxygen in the reverse direction during the desorption stage. Although this design theoretically ensures the regeneration efficiency of the adsorbent, it causes significant energy efficiency loss and resource waste problems in actual operation.

[0003] In-depth analysis shows that the energy efficiency bottleneck of the traditional desorption process is due to the homogenization selection of the blow washing medium and the target product. Since the initial oxygen concentration in air is only 21%, theoretically, about 5 cubic meters of raw air need to be treated to produce 1 cubic meter of oxygen. However, in actual operation, the traditional process has to re-inject 25-35% of the total oxygen production into the system for molecular sieve regeneration to meet the high-purity oxygen demand in the blow washing stage, which directly leads to a reduction of nearly one-fourth in the effective oxygen output. More seriously, the oxygen for blow washing still needs to be obtained by air compression and separation, so that the actual air treatment volume increases by 160% to 13 cubic meters per cubic meter of product oxygen produced, compared with the theoretical value. The essence of this phenomenon lies in the formation of a negative cycle of "oxygen production-oxygen consumption" in the system - the high-value-added product oxygen is repeatedly injected into the separation system as a process medium, causing secondary conversion loss of energy.

[0004] Specifically in terms of energy consumption, the air compression link accounts for 68-72% of the total energy consumption of the system. In the traditional process, the compressor set needs to run continuously under overload to maintain an operating pressure of 0.8-1.2 MPa and compensate for the pressure fluctuations caused by the blow washing process. This not only reduces the isentropic efficiency from the theoretical value of 75% to the actual value of 45-55%, but also causes cascading energy loss: an increase of 30% in the compressor surge frequency leads to mechanical loss, and a 25% increase in the cooling system load leads to additional power consumption. At the same time, the nitrogen adsorption capacity of the molecular sieve decreases by 5-8% after 3000 adsorption-desorption cycles, forcing the operator to increase the blow washing intensity to maintain the oxygen production concentration, further exacerbating the vicious cycle of energy consumption.

[0005] The technical dilemma reveals the fundamental contradiction of the conventional oxygen production process in medium selection and energy management. Although using the product oxygen as the regeneration medium can ensure the desorption efficiency of the molecular sieve, it makes the system fall into the trap of repeated conversion of high-grade energy, and a large amount of compression work is consumed in the preparation of the purge oxygen instead of effective output. Therefore, it is urgent to optimize and improve the desorption of the molecular sieve. Practical new type content

[0006] The purpose of the present application is to provide a segmented high-efficiency purge structure of a molecular sieve of an oxygen generator which can improve the energy efficiency of the conventional process.

[0007] In order to achieve the above purpose, the present application adopts the following scheme: a segmented high-efficiency purge structure of a molecular sieve of an oxygen generator, comprising:

[0008] The adsorption unit is composed of an adsorption tank A and an adsorption tank B, each of which is filled with molecular sieve filler, and the top and bottom of each adsorption tank is respectively connected with an air outlet branch pipe and an air inlet branch pipe;

[0009] The air inlet main pipe is connected with an external air compression device at one end and connected with the air inlet branch pipes of the adsorption tank A and the adsorption tank B at the other end, and an independently controlled air inlet control device is arranged on each air inlet branch pipe;

[0010] The air outlet main pipe is connected with a gas using end at one end and connected with the air outlet branch pipes of the adsorption tank A and the adsorption tank B at the other end;

[0011] The equalizing pipe is connected with the air outlet branch pipes of the two adsorption tanks at the left and right ends, and an equalizing valve is arranged on the equalizing pipe;

[0012] The oxygen purge pipe is connected with the air outlet branch pipes of the two adsorption tanks at the left and right ends, and an oxygen purge valve is arranged on the oxygen purge pipe;

[0013] The air purge pipe is connected with the air inlet main pipe at one end and connected with the air outlet branch pipes of the adsorption tank A and the adsorption tank B at the other end through a three-way connector, and an independently controlled air purge valve A and an air purge valve B are arranged on the pipe connected with each air outlet branch pipe;

[0014] The nitrogen discharge pipe is arranged on the air inlet branch pipes of the adsorption tank A and the adsorption tank B, and an independently controlled nitrogen discharge control device is arranged on each nitrogen discharge pipe.

[0015] The above scheme adopts the integrated design of the adsorption unit, the gas inlet main pipe, the gas outlet main pipe and various blow pipelines for desorption, realizes the segmented control of the adsorption and desorption stages in the oxygen production process, the oxygen blowing pipeline, the air blowing pipeline and the pressure equalization pipeline and the independently controlled valves ensure the accurate alternate use of the blowing medium (compressed air and oxygen), which is favorable for reducing the oxygen self-consumption, improving the energy consumption structure and improving the overall process efficiency.

[0016] As the preferred scheme of the present application, the gas inlet branch pipe line comprises a gas inlet branch pipe A connected to the bottom of the adsorption tank A and a gas inlet branch pipe B connected to the bottom of the adsorption tank B, and the gas inlet control device and the nitrogen discharge pipeline are connected to the gas inlet branch pipe A and the gas inlet branch pipe B respectively. The reasonable arrangement of the nitrogen discharge pipeline and the gas inlet branch pipe line is helpful to effectively separate the gas inlet and discharge processes, prevent mixing flow and improve system stability.

[0017] As the preferred scheme of the present application, the gas inlet control device comprises a gas inlet valve A arranged on the gas inlet branch pipe A and a gas inlet valve B arranged on the gas inlet branch pipe B, which realizes the accurate control of the two adsorption units; the nitrogen discharge pipeline is connected to the gas inlet branch pipe A between the gas inlet valve A and the adsorption tank A and connected to the gas inlet branch pipe B between the adsorption tank B and the gas inlet valve B, which is favorable for quickly discharging the nitrogen generated in the adsorption process and improving the blowing efficiency.

[0018] As the preferred scheme of the present application, the nitrogen discharge pipeline comprises a discharge pipe A connected to the gas inlet branch pipe A and a discharge pipe B connected to the gas inlet branch pipe B, and the nitrogen discharge control device comprises a nitrogen discharge valve A and a nitrogen discharge valve B arranged on the discharge pipe A and the discharge pipe B respectively, which makes the nitrogen discharge more efficient and accurate.

[0019] As the further scheme of the present application, a first oxygen sensor is arranged on the discharge pipe A and a second oxygen sensor is arranged on the discharge pipe B, which realizes the real-time monitoring of the oxygen content in the exhaust gas, is helpful to dynamically adjust the exhaust and blowing processes, ensures the oxygen purity of the produced gas and further optimizes the energy consumption.

[0020] As the preferred scheme of the present application, the gas outlet branch pipe line comprises a gas outlet branch pipe A connected to the top of the adsorption tank A and a gas outlet branch pipe B connected to the top of the adsorption tank B, the two ends of the pressure equalization pipeline and the oxygen blowing pipeline are connected across the gas outlet branch pipe A and the gas outlet branch pipe B, and the two gas outlet ends of the air blowing pipeline branched by the tee connector are connected to the gas outlet branch pipe A and the gas outlet branch pipe B respectively.

[0021] As a further aspect of the present utility model, a third oxygen sensor is arranged at the intersection of the pressure equalizing pipeline and the gas outlet branch pipe A, and a fourth oxygen sensor is arranged at the intersection of the pressure equalizing pipeline and the gas outlet branch pipe B, so that the oxygen concentration of the output gas can be monitored, the operation parameters can be timely fed back and adjusted, and the desired effect can be achieved in the purging and pressure equalizing process under different working conditions.

[0022] As a preferred aspect of the present utility model, a first one-way valve is arranged on the gas outlet branch pipe A between the pressure equalizing pipeline and the gas outlet main pipe, and a second one-way valve is arranged on the gas outlet branch pipe B between the pressure equalizing pipeline and the gas outlet main pipe, so that the gas can only flow in one direction, and backflow can be effectively prevented.

[0023] As a further aspect of the present utility model, a flow equalizing plate is arranged at the top of the inner cavity of the adsorption tank A and the adsorption tank B, respectively, the flow equalizing plate is close to the filler filled in the adsorption tank and the top outer circumferential wall thereof is close to the inner wall of the adsorption tank, the central part of the flow equalizing plate is densely provided with gas permeable holes penetrating upward and downward, and a plurality of gas permeable grooves are sequentially and spacedly arranged around the periphery of the gas permeable holes, a turbulence vane group capable of changing the air flow direction is arranged in each gas permeable groove, the turbulence vane group is evenly distributed in the gas permeable groove in the form of a fan blade, and the balanced distribution of the airflow in the adsorption tank is effectively realized. The flow equalizing plate improves the contact efficiency of the molecular sieve and the purging gas, reduces local airflow short circuit and temperature unevenness, and compared with the traditional straight blowing structure, the flow equalizing plate can reduce the problem that the purging gas may not uniformly penetrate the molecular sieve bed, resulting in local residual nitrogen, effectively improves the adsorption capacity utilization rate and the regeneration efficiency, and prolongs the service life of the molecular sieve.

[0024] As a further aspect of the present utility model, a plurality of flow guide grooves are sequentially and spacedly arranged around the circumferential outer wall of the flow equalizing plate, a flow guide hole penetrating the top of the flow equalizing plate is arranged at the top of the flow guide groove, and the outer circumferential diameter of the flow equalizing plate below the flow guide groove is smaller than the outer circumferential diameter of the flow equalizing plate above the flow guide groove, so that the directional flow and uniform distribution of the purging gas are enhanced, and the residual nitrogen gas at the corners of the molecular sieve or between the molecular sieve and the adsorption tank wall is reduced. Meanwhile, the position of the top surface of the outer periphery of the flow equalizing plate around the top opening of the flow guide hole is inwardly inclined, which helps to concentrate and accelerate the flow of the purging gas flow.

[0025] In summary, the utility model discloses relative to prior art its beneficial effect is: the utility model discloses the alternate medium synergic regeneration mechanism of segmented high -efficient blow -wash structure innovative design, realizes systematic optimization in the blow -wash desorption link of oxygen -making technology. First, segmented high -efficient blow -wash structure is integrated with the double -medium blow -wash pipeline of compressed air and oxygen, and is configured with the air blow -wash valve and oxygen blow -wash valve of independent control on respective pipeline, realizes the alternate medium synergic regeneration of desorption stage. In the initial stage, the pre -treatment compressed air from the air main pipe can effectively remove the adsorbed nitrogen in the molecular sieve through the air blow -wash pipeline, and in the later stage of desorption, the oxygen blow -wash valve is opened, and the remaining residual nitrogen is desorbed by using a small amount of oxygen generated in another tank, compared with the traditional process, the oxygen consumption rate is significantly reduced. The optimized air inlet branch pipeline and nitrogen discharge pipeline system ensure balanced gas flow, and improve the efficiency of the adsorption process.

[0026] Secondly, the dynamic equalization mechanism uses the data measured by the oxygen sensors at both ends of the equalization pipeline to control the equalization valve, effectively balancing the pressure between the adsorption tanks. The pressure fluctuation is reduced by about 50% compared with the traditional process, and the compressor load is significantly improved. At the same time, the oxygen sensor configured on the exhaust pipeline monitors the oxygen concentration of the exhaust gas in real time, and when the detection is lower than the preset threshold, the system automatically closes the nitrogen discharge valve and the oxygen blow -wash valve to avoid excessive blow -wash and waste oxygen.

[0027] Thirdly, the equal flow plate structure is innovatively designed, which integrates dense micropores, air permeable grooves, fan-shaped turbulence piece groups and flow guide grooves, and finely adjusts the blow -wash airflow in the adsorption tank. After optimization, the airflow uniformity index of the traditional straight blow structure is effectively improved, and the uniformity of molecular sieve desorption is effectively improved. At the same time, the structure of the equal flow plate can also significantly improve the uniformity of the molecular sieve adsorption heat distribution, greatly reduce the local temperature rise, thereby slowing down the influence of thermal fatigue on the performance of the molecular sieve.

[0028] Fourthly, the multiple oxygen sensors and anti -backflow check valves at the intersection of the exhaust pipe, equalization pipeline and air outlet branch pipeline constitute a dynamic feedback regulation. It can determine the blow -wash end point in real time, accurately control the oxygen blow -wash amount, and further improve the stability of the output oxygen purity by an order of magnitude compared with the traditional process, while effectively preventing gas cross contamination caused by high pressure oxygen backflow, and ensuring the safe and efficient operation of the entire oxygen generation system.

[0029] Finally, through the segmented high -efficient blow -wash structure, seamless switching and rapid redundant switching in the fault state of the adsorption -desorption stage in the working process of the oxygen generator are realized. Without stopping, efficient alternate oxygen production and synchronous desorption operation can be realized.

[0030] In summary, the utility model discloses the unit oxygen energy consumption, raw material air utilization rate and so on key index have breakthrough improvement compared with traditional craft, keep the continuous supply of the oxygen purity steady of not stopping simultaneously and prolong the service life of molecular sieve. Provide the segmented type high -efficient purging structure of molecular sieve of oxygen generator of high reliability, low energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is the connection schematic view of the utility model.

[0032] Figure 2 It is one of the three-dimensional structure view of the utility model.

[0033] Figure 3 It is the second three-dimensional structure view of the utility model.

[0034] Figure 4 It is the sectional view of one of the adsorption tank of the utility model.

[0035] Figure 5 It is Figure 4 It is the enlarged view of the place A in the middle.

[0036] Figure 6 It is one of the three-dimensional view of the flow equalizing plate in the utility model.

[0037] Figure 7 It is the second three-dimensional view of the flow equalizing plate in the utility model.

[0038] Figure 8 It is the sectional view of the flow equalizing plate in the utility model, and the enlarged view of the local area in the drawing.

[0039] BRIEF DESCRIPTION OF DRAWINGS: 1, adsorption tank A, 2, adsorption tank B, 3, inlet valve A, 4, inlet valve B, 5, inlet main pipe, 6, discharge pipe A, 7, nitrogen discharge valve A, 8, discharge pipe B, 9, nitrogen discharge valve B, 10, first oxygen sensor, 11, second oxygen sensor, 12a, outlet branch pipe A, 12b, inlet branch pipe A, 13a, outlet branch pipe B, 13b, inlet branch pipe B, 14, air purging valve A, 15, air purging valve B, 16, oxygen purging valve, 16a, oxygen purging pipeline, 17, third oxygen sensor, 18, pressure equalizing valve, 18a, pressure equalizing pipeline, 19, fourth oxygen sensor, 20, first check valve, 21, second check valve, 22, outlet main pipe, 23, air purging pipeline, 24, flow equalizing plate, 25, air hole, 26, air slot, 27, spoiler group, 28, flow guide groove, 29, flow guide hole, 30, molecular sieve. DETAILED DESCRIPTION

[0040] The following detailed description provides for various different embodiments or examples for implementing the present application. Of course, these are merely examples and are not intended to be limiting. Also, like reference numerals are used to designate corresponding parts throughout the several views, which can be repeated among different examples. These are done for simplicity and clarity of description and are not meant to limit the application to a particular example or configuration.

[0041] Also, where spatially relative terms are used, such as "beneath", "below", "lower", "above", "upper", and the like, they are used with respect to the application as depicted in the drawings. The spatially relative terms can encompass different positions of the device in use or operation in addition to the position which is described in the context of the drawings. The device can be rotated 90 degrees or other orientations in different positions and the spatially relative descriptors used herein can be interpreted likewise. The terms "first", "second", etc., are used only to describe different examples and are not intended to signify relative importance or a quantity of the indicated technical features. Thus, features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0042] The present application will be further described with reference to the drawings and the following specific examples: Figures 1 to 8The illustrated oxygen generator molecular sieve sectional high-efficiency purging structure includes an alternating operation adsorption unit composed of adsorption tank A1 and adsorption tank B2, both of which are filled with molecular sieve 30 filler. The bottom of adsorption tank A1 is connected with gas inlet branch pipe A12b, and the bottom of adsorption tank B2 is connected with gas inlet branch pipe B13b. The gas inlet branch pipe A12b and the gas inlet branch pipe B13b jointly form a gas inlet branch pipe circuit, and the gas inlet ends are jointly connected to a gas inlet main pipe 5 extending from the gas outlet end of an external air compression device. A gas inlet valve A3 is installed on the gas inlet branch pipe A12b, and a gas inlet valve B4 is installed on the gas inlet branch pipe B13b. The gas inlet valve A3 and the gas inlet valve B4 constitute a gas inlet control device for controlling the compressed air entering the adsorption tank. The top of the adsorption tank A1 is connected with gas outlet branch pipe A12a, and the top of the adsorption tank B2 is connected with gas outlet branch pipe B13a. The gas outlet branch pipe A12a and the gas outlet branch pipe B13a jointly form a gas outlet branch pipe circuit, and the gas outlet end of the gas outlet branch pipe circuit is connected to a gas outlet main pipe 22, which extends to connect a gas using device or a gas storage tank. An oxygen purging pipeline 16a is connected between the gas outlet branch pipe A12a and the gas outlet branch pipe B13a, and an oxygen purging valve 16 is provided on the pipeline of the oxygen purging pipeline 16a to control the gas flow in the oxygen purging pipeline 16a. A discharge pipe A6 is connected to the gas inlet branch pipe A12b between the adsorption tank A1 and the gas inlet valve A3, and a discharge pipe B8 is connected to the gas inlet branch pipe B13b between the adsorption tank B2 and the gas inlet valve B4. The discharge pipe A6 and the discharge pipe B8 constitute a nitrogen discharge pipeline for discharging nitrogen desorbed from the molecular sieve 30. The gas outlet end of the nitrogen discharge pipeline is provided with a nitrogen discharge control device, which includes a nitrogen discharge valve A7 and a nitrogen discharge valve B9 respectively provided on the gas outlet ends of the discharge pipe A6 and the discharge pipe B8. In addition, an equalization pipeline 18a is provided above the oxygen purging pipeline 16a and is connected across the gas outlet branch pipe A12a and the gas outlet branch pipe B13a at both ends. The equalization pipeline 18a is provided with an equalization valve 18 for separately controlling the opening and closing of the pipeline. A first one-way valve 20 is provided on the gas outlet branch pipe A12a between the equalization pipeline 18a and the gas outlet main pipe 22, and a second one-way valve 21 is provided on the gas outlet branch pipe B13a between the equalization pipeline 18a and the gas outlet main pipe 22, to prevent the gas flow in the gas outlet main pipe 22 from flowing back into the gas outlet branch pipe circuit.The above-mentioned scheme is basically the same as the existing scheme of using pure oxygen to flush the molecular sieve, and the difference between the present embodiment and the conventional desorption structure lies in that an air flushing pipeline 23 is arranged below the oxygen flushing pipeline 16a and directly connected to the air inlet main pipeline 5, one end of the air flushing pipeline 23 is provided with a three-way connector, the other two ends of the three-way connector are respectively connected to the air outlet branch pipeline A 12a and the air outlet branch pipeline B 13a through pipelines, and an air flushing valve A 14 for controlling the opening and closing of the pipeline between the three-way connector and the air outlet branch pipeline A 12a is arranged, and an air flushing valve B 15 for controlling the opening and closing of the pipeline between the three-way connector and the air outlet branch pipeline B 13a is arranged.

[0043] As shown in Figures 1 to 3 In order to detect the oxygen content in each pipeline, a first oxygen sensor 10 is arranged on the discharge pipeline A 6, and a second oxygen sensor 11 is arranged on the discharge pipeline B 8. A third oxygen sensor 17 is arranged at the junction of the pressure equalization pipeline 18a and the air outlet branch pipeline A 12a, and a fourth oxygen sensor 19 is arranged at the junction of the pressure equalization pipeline 18a and the air outlet branch pipeline B 13a.

[0044] In addition, as shown in Figures 4 to 8As shown, in order to prevent the problem that the flushing gas can not uniformly penetrate the molecular sieve 30 bed, resulting in local residual nitrogen, a flow uniformizing plate 24 is arranged at the top of the inner cavity of the adsorption tank A1 and the adsorption tank B2 respectively, the flow uniformizing plate 24 is close to the filler filled in the adsorption tank above, and the top outer circumferential wall of the flow uniformizing plate 24 is close to the inner wall of the adsorption tank, the central part of the flow uniformizing plate 24 is densely provided with gas permeation holes 25 penetrating up and down, and a plurality of gas permeation grooves 26 are sequentially and spaced apart around the periphery of the gas permeation holes 25, each gas permeation groove 26 is provided with a turbulence vane group 27 capable of changing the direction of air flow, the turbulence vane group 27 is uniformly distributed in the gas permeation groove 26 in the form of a fan blade, the densely arranged gas permeation holes 25 can effectively and uniformly disperse the gas flow flushed into the adsorption tank from the gas outlet branch pipe, and the turbulence vane group 27 in the gas permeation groove 26 can change the direction of the gas flow to spiral downward while the gas flow passes through, effectively preventing the case that the straight flushing gas flow cannot reach each corner of the molecular sieve 30. It also needs to be explained that nitrogen is easy to be left in the gap at the outer wall of the molecular sieve 30 and in the gap of the inner wall of the adsorption tank, therefore, a plurality of flow guide grooves 28 are sequentially and spaced apart around the outer circumferential wall of the flow uniformizing plate 24, the top of the flow guide groove 28 is provided with a flow guide hole 29 penetrating the top of the flow uniformizing plate 24, the outer circumferential diameter of the flow uniformizing plate 24 below the flow guide groove 28 is smaller than the outer circumferential diameter of the flow uniformizing plate 24 above the flow guide groove 28, and the outer circumferential top surface of the flow uniformizing plate 24 at the position around the top opening of the flow guide hole 29 is inwardly inclined, when the flushing gas flow blows down from the top of the adsorption tank, the inwardly inclined outer circumferential top surface of the flow uniformizing plate 24 can concentrate most of the gas flow to the central gas permeation holes 25 and the gas permeation grooves 26, on the one hand, it can prevent the gas flow from being blocked by the surface of the flow uniformizing plate 24, resulting in that the gas flow cannot smoothly enter the gas permeation holes 25 and the gas permeation grooves 26, on the other hand, it can accelerate the flowability of the gas flow. The flow guide groove 28 can guide the gas flow to the outer circumferential wall of the flow uniformizing plate 24 through the flow guide hole 29, because the outer circumferential diameter of the flow uniformizing plate 24 below the flow guide groove 28 is smaller than the outer circumferential diameter of the flow uniformizing plate 24 above the flow guide groove 28, therefore, there will be a gap between the flow guide groove 28 and the inner wall of the adsorption tank, and the gas flow from the flow guide groove 28 will be guided downward into the gap between the molecular sieve 30 and the adsorption tank.

[0045] It should be noted that the air inlet control device, nitrogen discharge control device and the like in the embodiment can be increased with necessary sensing elements such as pressure sensors, flow rate detectors and the like in the manner of the prior art. These sensing elements cooperate with the information fed back by the respective oxygen sensors (the oxygen sensors in the embodiment take oxygen concentration detectors as an example) to determine the timing of opening or closing of the air inlet valves A3, air inlet valves B4, pressure equalizing valve 18, oxygen purge valve 16, air purge valve A14, air purge valve B15 and nitrogen discharge valves A7 and B9 according to preset programs and real-time data through an external control system such as a PLC (programmable logic controller) or a distributed control system (DCS), so as to ensure safe and efficient operation of the entire oxygen generating system.

[0046] The working principle of the utility model is as follows: when the adsorption tank A1 is adsorbing, the air purge valve B15 and the nitrogen discharge valve B9 are opened, compressed air is used to purge the adsorption tank B2, and when the second oxygen sensor 11 detects that the oxygen concentration of the gas in the discharge pipe B8 approaches that of the atmosphere, the second half of the purging is performed; the air purge valve B15 is closed and the oxygen purge valve 16 is opened, oxygen is used to purge the adsorption tank B2, and when the second oxygen sensor 11 detects that the oxygen concentration of the gas in the discharge pipe B8 rises to a certain degree, pressure equalization is performed; the oxygen purge valve 16 and the nitrogen discharge valve B9 are closed, and the pressure equalizing valve 18 is opened to equalize pressure for a certain period of time; when the third oxygen sensor 17 detects that the oxygen concentration of the gas in the outlet branch pipe A12a decreases, the molecular sieve 30 of the adsorption tank A1 has been saturated, at which time the above steps are repeated to purge, equalize pressure and generate oxygen for the adsorption tank A1, and the adsorption cycle of the oxygen generator is completed. If the amount of oxygen used decreases, the time for which the molecular sieve 30 is saturated will be longer, and according to the oxygen concentration detected by the third oxygen sensor 17 and the fourth oxygen sensor 19 in the outlet branch pipe, the time for which the air is adsorbed is controlled to be longer, so as to avoid premature and frequent switching to reduce gas consumption and improve efficiency.

[0047] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above, and those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principle of the utility model, and various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A segmented high-efficiency purge structure of a molecular sieve of an oxygen generator, characterized in that, The application relates to a kind of oxygen concentrators, comprising: adsorption unit, by adsorption tank A (1) and adsorption tank B (2) are formed, each adsorption tank is filled with molecular sieve filler, the top and bottom of two adsorption tanks are respectively connected with gas outlet branch pipe line and gas inlet branch pipe line; Gas inlet main pipe (5), one end is connected with external air compression equipment, the other end is respectively connected with the gas inlet branch pipe line of adsorption tank A (1) and adsorption tank B (2), and independently controlled gas inlet control device is arranged on each gas inlet branch pipe line; Gas outlet main pipe (22), one end is connected with gas end, the other end is respectively connected with the gas outlet branch pipe line of adsorption tank A (1) and adsorption tank B (2); Pressure equalizing pipeline (18a), left and right ends are respectively connected with the gas outlet branch pipe line of two adsorption tanks, and pressure equalizing valve (18) is arranged on the pressure equalizing pipeline (18a); Oxygen flushing pipeline (16a), left and right ends are respectively connected with the gas outlet branch pipe line of two adsorption tanks, and oxygen flushing valve (16) is arranged on the oxygen flushing pipeline (16a); Air flushing pipeline (23), one end of the air flushing pipeline (23) is communicated with the gas inlet main pipe (5), the other end is connected with the gas outlet branch pipe line of adsorption tank A (1) and adsorption tank B (2) through a three-way connector, and independently controlled air flushing valve A (14) and air flushing valve B (15) are arranged on the pipeline where the air flushing pipeline (23) is connected with each gas outlet branch pipe line; Nitrogen discharge pipeline is arranged on the gas inlet branch pipe line of adsorption tank A (1) and adsorption tank B (2) respectively, and independently controlled nitrogen discharge control device is arranged on each nitrogen discharge pipeline.

2. The segmented high-efficiency purge structure of a molecular sieve of an oxygen generator according to claim 1, characterized in that, The gas inlet branch pipe line comprises gas inlet branch pipe A (12b) connected with the bottom of adsorption tank A (1) and gas inlet branch pipe B (13b) connected with the bottom of adsorption tank B (2), and the gas inlet control device and the nitrogen discharge pipeline are connected with the gas inlet branch pipe A (12b) and the gas inlet branch pipe B (13b) respectively.

3. The segmented high-efficiency purge structure of the molecular sieve of the oxygen generator according to claim 2, characterized in that, The gas inlet control device comprises gas inlet valve A (3) arranged on the gas inlet branch pipe A (12b) and gas inlet valve B (4) arranged on the gas inlet branch pipe B (13b), and the nitrogen discharge pipeline is connected with the gas inlet branch pipe A (12b) between the gas inlet valve A (3) and the adsorption tank A (1) and connected with the gas inlet branch pipe B (13b) between the adsorption tank B (2) and the gas inlet valve B (4).

4. The segmented high-efficiency purge structure of the molecular sieve of the oxygen generator according to claim 3, characterized in that, The nitrogen discharge pipeline comprises discharge pipe A (6) connected with the gas inlet branch pipe A (12b) and discharge pipe B (8) connected with the gas inlet branch pipe B (13b), and the nitrogen discharge control device comprises nitrogen discharge valve A (7) and nitrogen discharge valve B (9) arranged on the discharge pipe A (6) and the discharge pipe B (8) respectively.

5. The segmented high-efficiency purge structure of the molecular sieve of the oxygen generator according to claim 4, characterized in that, First oxygen sensor (10) is arranged on the discharge pipe A (6), and second oxygen sensor (11) is arranged on the discharge pipe B (8).

6. The segmented high-efficiency purge structure of a molecular sieve of an oxygen generator according to claim 5, characterized in that, The air outlet branch pipe circuit includes air outlet branch pipe A (12a) connected to the top of adsorption tank A (1) and air outlet branch pipe B (13a) connected to the top of adsorption tank B (2), both ends of the equalizing pipe (18a) and the oxygen flushing pipe (16a) are connected to air outlet branch pipe A (12a) and air outlet branch pipe B (13a), and the air flushing pipe (23) is connected to air outlet branch pipe A (12a) and air outlet branch pipe B (13a) through a three-way connector.

7. The segmented high-efficiency purge structure of a molecular sieve of an oxygen generator according to claim 6, characterized in that, A third oxygen sensor (17) is arranged at the junction of the equalizing pipe (18a) and the air outlet branch pipe A (12a), and a fourth oxygen sensor (19) is arranged at the junction of the equalizing pipe (18a) and the air outlet branch pipe B (13a).

8. The segmented high-efficiency purge structure of a molecular sieve of an oxygen generator according to claim 7, characterized in that, A first one-way valve (20) is arranged on the air outlet branch pipe A (12a) between the equalizing pipe (18a) and the air outlet main pipe (22), and a second one-way valve (21) is arranged on the air outlet branch pipe B (13a) between the equalizing pipe (18a) and the air outlet main pipe (22).

9. The segmented high-efficiency purge structure of a molecular sieve of an oxygen generator according to any one of claims 1 to 8, characterized in that, A flow equalizing plate (24) is arranged at the top of the inner cavity of the adsorption tank A (1) and the adsorption tank B (2), the flow equalizing plate (24) is close to the filler in the adsorption tank, the top outer circumferential wall of the flow equalizing plate (24) is close to the inner wall of the adsorption tank, the central part of the flow equalizing plate (24) is densely covered with gas permeable holes (25) penetrating up and down, and a plurality of gas permeable grooves (26) are arranged in sequence and at intervals around the outer periphery of the gas permeable holes (25), each gas permeable groove (26) is provided with a turbulence vane group (27) capable of changing the direction of air flow, and the turbulence vane group (27) is evenly distributed in the gas permeable groove (26) in the form of a fan blade.

10. The segmented high-efficiency purge structure of a molecular sieve of an oxygen generator according to claim 9, characterized in that, A plurality of flow guide grooves (28) are arranged in sequence and at intervals around the circumferential outer wall of the flow equalizing plate (24), the top of the flow guide groove (28) is provided with a flow guide hole (29) penetrating the top of the flow equalizing plate (24), the outer circumferential diameter of the flow equalizing plate (24) below the flow guide groove (28) is smaller than the outer circumferential diameter of the flow equalizing plate (24) above the flow guide groove (28), and the position of the top surface of the outer periphery of the flow equalizing plate (24) around the top opening of the flow guide hole (29) is inclined inward.

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