An oxygen enriched air central delivery system

Abstract

The application discloses a kind of oxygen-enriched air central conveying system, belong to air separation and water-gas mixed conveying technical field, including oxygen-enriched air generating device, oxygen-enriched air generating device includes positive pressure outer shell, oxygen-permeable membrane device is coaxially arranged in the inside of positive pressure outer shell, and high-pressure centrifugal fan, spiral guide vane is equipped between the inner wall of positive pressure outer shell and the outer wall of oxygen-permeable membrane device, and spiral airflow passage is formed.The application adopts the above-mentioned oxygen-enriched air central conveying system, the oxygen-permeable membrane is extruded from outside to inside by positive pressure, so that the pressure resistance is improved, the spiral airflow helps to reduce dust adhesion, the jet pump helps to reduce the conveying noise, and has the advantages of simple structure, central oxygen supply.

Description

Technical Field

[0001] This invention relates to the field of air separation and water-air mixing and conveying technology, and in particular to an oxygen-enriched air central conveying system. Background Technology

[0002] In existing technologies, membrane-based oxygen enrichment technology utilizes the difference in permeation rates between oxygen and nitrogen in membrane materials to separate oxygen-enriched air from the air. It boasts advantages such as low energy consumption, simple equipment, and no pollution, making it more cost-effective than other oxygen production technologies. However, existing membrane-based oxygen enrichment devices and systems generally suffer from the following problems.

[0003] First, the existing oxygen-enriched membrane equipment has insufficient pressure resistance of the membrane structure, making it difficult to withstand high pressure. Furthermore, the membrane is prone to deformation under tension from the inside out, which limits the oxygen enrichment output.

[0004] Secondly, the membrane surface is easily clogged by dust, and its oxygen permeability deteriorates rapidly. Furthermore, the existing positive pressure air supply airflow direction is parallel to the membrane surface, which cannot effectively remove dust from the membrane surface.

[0005] Third, existing membrane-based oxygen enrichment devices mostly use vacuum pumps for suction, which has low energy efficiency, high noise and limited distance for oxygen-enriched air transportation, low utilization rate of gas-liquid mixed oxygen, and no central transportation system has been formed. Summary of the Invention

[0006] The purpose of this invention is to provide a central oxygen-enriched air delivery system to solve the problems in existing membrane oxygen-enrichment devices, such as easy clogging of the membrane surface by dust, low efficiency of vacuum pumps, high delivery noise and low utilization rate of gas-liquid mixed oxygen, and limited oxygen production due to insufficient pressure resistance of the membrane structure. This invention helps to achieve self-cleaning of the membrane surface, silent hydraulic delivery, and centralized oxygen supply.

[0007] To achieve the above objectives, the present invention provides an oxygen-enriched air central delivery system, including an oxygen-enriched air generating device, the oxygen-enriched air generating device including a positive pressure outer shell, an oxygen-permeable membrane device coaxially disposed inside the positive pressure outer shell, and a high-pressure centrifugal fan. The upper part of the positive pressure outer shell is provided with an air inlet, which is connected to the air outlet of the high-pressure centrifugal fan; the lower part of the positive pressure outer shell is provided with an exhaust port; a spiral guide vane is provided between the inner wall of the positive pressure outer shell and the outer wall of the oxygen permeable membrane device to form a spiral airflow channel. The oxygen-permeable membrane device has a gas collecting pipe at its center, which is inserted into the device. The pipe is connected to the air inlet of a jet pump via a pipe. The liquid inlet of the jet pump is connected to the outlet of a circulation pump. The liquid outlet of the jet pump is connected to an oxygen-enriched water delivery pipe, which is connected to a gas-liquid separation component. The component is connected to a circulating water tank via a return pipe. The inlet of the circulation pump is connected to the tank, forming a circulating water path.

[0008] Preferably, both the positive pressure outer shell and the oxygen-permeable membrane device are cylindrical structures.

[0009] Preferably, the oxygen-permeable membrane device consists of a three-layer structure, which consists of a skeleton, a metal mesh, and an oxygen-permeable membrane from the inside out, with the oxygen-permeable membrane attached to the outside of the metal mesh.

[0010] Preferably, the spiral guide blades between the positive pressure outer shell and the oxygen permeable membrane device are continuous spiral blades.

[0011] Preferably, the gas-liquid separation assembly includes an oxygen-enriched water separator, a valve, and a gas-liquid separation release device connected to the oxygen-enriched water delivery pipeline. The oxygen-enriched water separator is connected to a plurality of gas-liquid separation release devices arranged at the user end via branch pipelines and valves.

[0012] Preferably, the gas-liquid separation and release device is an open-type release device or a microporous aeration release device.

[0013] Preferably, the circulating water tank is also equipped with an automatic water replenishment valve, a drain solenoid valve, and a liquid level control device.

[0014] Preferably, the liquid level control device is a liquid level controller or a float valve.

[0015] Preferably, the high-pressure centrifugal fan is equipped with a tangential air intake air suspension bearing.

[0016] Preferably, the system includes at least two sets of oxygen-enriched air generating devices connected in series.

[0017] Therefore, the beneficial effects of the above-mentioned oxygen-enriched air central delivery system of the present invention are as follows: (1) By placing the positive pressure outer shell on the outside of the oxygen permeable membrane device, air compresses the oxygen permeable membrane from the outside to the inside, and the membrane bears the circumferential pressure from the outside to the inside. The frame and metal mesh bear this pressure, and the pressure resistance is improved.

[0018] (2) A spiral airflow channel is formed by setting spiral guide vanes between the inner wall of the positive pressure outer shell and the outer wall of the oxygen permeable membrane device. The positive pressure airflow flows on the outside of the oxygen permeable membrane device, forming a shearing and sweeping effect on the outer surface of the membrane, which helps to reduce dust adhesion and maintain stable membrane oxygen permeability.

[0019] (3) The jet pump is directly connected to the membrane center gas collection pipe, and uses circulating water to transport and mix oxygen-enriched air, which helps to reduce transport noise and achieve centralized oxygen supply.

[0020] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of an embodiment of an oxygen-enriched air central delivery system according to the present invention; Figure 2 This is a cross-sectional schematic diagram of the positive pressure outer shell and the oxygen-permeable membrane device of an embodiment of an oxygen-enriched air central delivery system of the present invention; Figure 3 This is a cross-sectional schematic diagram of an air suspension bearing according to an embodiment of an oxygen-enriched air central delivery system of the present invention; Figure 4 This is a schematic diagram of the series flow of an oxygen-enriched air generating device according to an embodiment of an oxygen-enriched air central delivery system of the present invention.

[0022] Figure Labels 1. Positive pressure outer casing; 2. Jet pump; 3. Circulating water tank; 4. Circulating pump; 5. Gas-liquid separation and release device; 6. Check valve; 7. Oxygen-enriched water separator; 8. Oxygen-permeable membrane device; 9. High-pressure centrifugal fan; 11. Air inlet; 12. Exhaust outlet; 13. Spiral guide vane; 21. Liquid inlet; 22. Liquid outlet; 23. Air ejector inlet end; 31. Automatic water replenishment valve; 32. Drain solenoid valve; 33. Liquid level control device; 51. Valve; 81. Gas collection pipe; 91. Outer ring of air suspension bearing; 92. Inner ring of air suspension bearing; 93. Annular air suspension gas channel; 94. Air suspension gas inlet pipe; 95. Tangential channel assembly; 96. Tangential channel; 97. Rotating shaft; 98. Air film gap. Detailed Implementation

[0023] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] Example 1: like Figures 1 to 4As shown, this embodiment provides an oxygen-enriched air central delivery system, including an oxygen-enriched air generating device, which includes a positive pressure outer shell 1, an oxygen-permeable membrane device 8, and a high-pressure centrifugal fan 9.

[0026] The positive pressure outer shell 1 is a cylindrical stainless steel cylinder with an oxygen-permeable membrane device 8 coaxially arranged inside. The oxygen-permeable membrane device 8 has a three-layer structure, consisting of a skeleton, a metal mesh, and an oxygen-permeable membrane from the inside out. The oxygen-permeable membrane is attached to the outside of the metal mesh. A spiral guide vane 13 is arranged between the inner wall of the positive pressure outer shell 1 and the outer wall of the oxygen-permeable membrane device 8 to form a spiral airflow channel. The spiral guide vane 13 is a continuous spiral vane.

[0027] The upper part of the positive pressure outer shell 1 is provided with an air inlet 11, which is arranged tangentially to the cylinder body, so that the airflow enters tangentially to form a swirling flow. The air inlet 11 is connected to the outlet end of the high-pressure centrifugal fan 9, which is equipped with a tangential air-suspended bearing. The air-suspended bearing includes an outer ring 91, an inner ring 92, an annular air-suspended gas channel 93, a suspended gas inlet pipe 94, a tangential channel assembly 95, a tangential channel 96, a rotating shaft 97, and an air film gap 98. An annular air suspension gas channel 93 is provided inside the outer ring 91 and inner ring 92 of the air suspension bearing. An air suspension gas inlet pipe 94 is provided outside the annular channel 93, which is connected to each tangential channel 96. Multiple tangential channel assemblies 95 are nested in the outer ring 91 and inner ring 92 of the air suspension bearing. The multiple tangential channel assemblies 95 form tangential channels 96 with each other. The multiple tangential channel assemblies 95 form an air film gap 98 around the rotating shaft 97. Since the air intake adopts tangential and coordinated along the rotation direction of the rotating shaft 97, the air film stiffness is very strong and the load-bearing capacity is also very strong. When used as a bearing for a centrifugal fan, it can rotate at high speed without causing the bearing to overheat and be damaged, thereby increasing the air pressure and improving the oxygen enrichment output and efficiency.

[0028] The lower part of the positive pressure outer shell 1 is provided with an exhaust port 12 for discharging nitrogen-rich exhaust gas and blown-away dust.

[0029] The oxygen permeable membrane device 8 has a gas collecting pipe 81 at its center. The gas collecting pipe 81 is inserted into the oxygen permeable membrane device 8, and the upper end of the gas collecting pipe 81 is connected to the air inlet end 23 of the jet pump 2 through a pipe.

[0030] The liquid inlet 21 of the jet pump 2 is connected to the outlet of the circulation pump 4, and the liquid outlet 22 of the jet pump 2 is connected to the oxygen-enriched water delivery pipeline. The oxygen-enriched water delivery pipeline is connected to the oxygen-enriched water separator 7. The oxygen-enriched water separator 7 is connected to several gas-liquid separation and release devices 5 arranged at the user end through branch pipes and valves 51. The gas-liquid separation and release device 5 is an open-type release device or a microporous aeration release device.

[0031] The outlet of the gas-liquid separation and release device 5 is connected to the circulating water tank 3 through a return pipe to form a circulating water circuit. A check valve 6 is installed on the return pipe. Both the oxygen-enriched water delivery pipe and the return pipe are made of insulating materials, such as UPVC insulating pipe.

[0032] The circulating water tank 3 is also equipped with an automatic water replenishment valve 31 and a drain solenoid valve 32, as well as a liquid level control device 33, which is a liquid level controller or a float valve.

[0033] The working principle is as follows: the high-pressure centrifugal fan 9 sends air from the environment tangentially from the top into the spiral airflow channel between the positive pressure outer shell 1 and the oxygen permeable membrane device 8. The air flows downward along the spiral airflow channel. Under the action of centrifugal force, oxygen preferentially permeates through the oxygen permeable membrane and enters the gas collection pipe 81. The positive pressure squeezes the oxygen permeable membrane from the outside to the inside. The membrane bears the circumferential pressure. Utilizing the force characteristics of the cylindrical structure, the pressure resistance is stronger. The nitrogen-rich exhaust gas is discharged from the lower exhaust port 12. The spiral airflow continuously shears and blows the outer surface of the oxygen permeable membrane, making it impossible for dust to adhere and achieving self-cleaning.

[0034] The oxygen-enriched air collected by the air collection pipe 81 is drawn in by the air inlet of the jet pump 2. The jet pump 2 uses the high-speed water flow provided by the circulating pump 4 to generate negative pressure, which draws in the oxygen-enriched air and breaks it into microbubbles, which are then efficiently mixed into the water to form oxygen-enriched water.

[0035] Oxygen-enriched water is delivered to the user's end via an oxygen-enriched water delivery pipeline. The oxygen-enriched air is released into the indoor space via a gas-liquid separation and release device 5. The water flows back to the circulating water tank 3 via a return pipeline, thus achieving recycling.

[0036] The liquid level control device 33 of the circulating water tank 3 controls the automatic water replenishment valve 31 to replenish water when the liquid level drops, and the drain solenoid valve 32 opens periodically to discharge stagnant water, preventing the growth of algae and bacteria and ensuring water quality.

[0037] Example 2: like Figure 4 As shown, this embodiment provides an oxygen-enriched air central delivery system, including at least two sets of oxygen-enriched air generating devices. The air collection pipe 81 of the first set of oxygen-enriched air generating devices is connected to the air inlet end of the high-pressure centrifugal fan 9 of the second set of oxygen-enriched air generating devices through a pipeline. The air outlet end of the high-pressure centrifugal fan 9 is connected to the air inlet 11 of the positive pressure outer shell 1 of the set of oxygen-enriched air generating devices. The air collection pipe 81 of the last set of oxygen-enriched air generating devices is connected to the ejector air inlet end 23 of the jet pump 2.

[0038] This embodiment uses two groups as examples for illustration. Group A oxygen-enriched air generating device includes a positive pressure outer shell 1, a high-pressure centrifugal fan 9, and an oxygen-permeable membrane device 8. Group B oxygen-enriched air generating device also includes a positive pressure outer shell 1, a high-pressure centrifugal fan 9, and an oxygen-permeable membrane device 8.

[0039] The gas collecting pipe 81 of the oxygen-enriched air generating device in group A is connected to the air inlet of the high-pressure centrifugal fan 9 in group B through a pipe. The gas collecting pipe 81 of the oxygen-enriched air generating device in group B is connected to the air inlet 23 of the jet pump 2 through a pipe. The connection method of the liquid inlet 21 and liquid outlet 22 of the jet pump 2 is the same as that in embodiment one.

[0040] During operation, ambient air is pressurized by the high-pressure centrifugal fan 9 in group A and then enters the oxygen-enriched air generating device in group A for the first oxygen separation. The oxygen-enriched air then enters the high-pressure centrifugal fan 9 in group B through the gas collecting pipe 81 in group A, and after being pressurized again, it enters the oxygen-enriched air generating device in group B for the second oxygen separation. Finally, the high-purity oxygen-enriched air enters the jet pump 2 through the gas collecting pipe 81 in group B. The subsequent process is the same as in Example 1. High-purity oxygen can be produced by connecting multiple groups in series.

[0041] Therefore, the present invention adopts the above-mentioned oxygen-enriched air central delivery system. The positive pressure outer shell is located outside the oxygen-permeable membrane device. Air is squeezed from the outside to the inside of the oxygen-permeable membrane, which improves the pressure resistance. The spiral guide vanes form a spiral airflow channel, and the airflow shears and blows the outer surface of the membrane, which helps to reduce dust adhesion. The jet pump is directly connected to the central gas collection pipe of the membrane. The oxygen-enriched air is delivered and mixed using circulating water, which helps to reduce delivery noise. It has the advantages of simple structure and centralized oxygen supply.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A central oxygen-enriched air delivery system, characterized in that: The device includes an oxygen-enriched air generating device, which includes a positive pressure housing, an oxygen-permeable membrane device coaxially disposed inside the positive pressure housing, and a high-pressure centrifugal fan. The upper part of the positive pressure outer shell is provided with an air inlet, which is connected to the air outlet of the high-pressure centrifugal fan; the lower part of the positive pressure outer shell is provided with an exhaust port; a spiral guide vane is provided between the inner wall of the positive pressure outer shell and the outer wall of the oxygen permeable membrane device to form a spiral airflow channel. The oxygen-permeable membrane device has a gas collecting pipe at its center, which is inserted into the device. The gas collecting pipe is connected to the air inlet of the jet pump via a pipe. The liquid inlet of the jet pump is connected to the outlet of the circulation pump. The liquid outlet of the jet pump is connected to the oxygen-enriched water delivery pipe. The oxygen-enriched water delivery pipe is connected to the gas-liquid separation component. The gas-liquid separation component is connected to the circulating water tank via a return pipe. The inlet of the circulation pump is connected to the circulating water tank, forming a circulating water path.

2. The oxygen-enriched air central delivery system according to claim 1, characterized in that: Both the positive pressure outer shell and the oxygen-permeable membrane device are cylindrical structures.

3. The oxygen-enriched air central delivery system according to claim 1, characterized in that: The oxygen-permeable membrane device consists of a three-layer structure, from the inside out: a frame, a metal mesh, and an oxygen-permeable membrane, with the oxygen-permeable membrane attached to the outside of the metal mesh.

4. The oxygen-enriched air central delivery system according to claim 1, characterized in that: The spiral guide blades between the positive pressure outer shell and the oxygen permeable membrane device are continuous spiral blades.

5. The oxygen-enriched air central delivery system according to claim 1, characterized in that: The gas-liquid separation assembly includes an oxygen-enriched water separator, a valve, and a gas-liquid separation release device connected to the oxygen-enriched water delivery pipeline. The oxygen-enriched water separator is connected to several gas-liquid separation release devices arranged at the user end via branch pipes and valves.

6. The oxygen-enriched air central delivery system according to claim 5, characterized in that: The gas-liquid separation and release device is an open-type release device or a microporous aeration release device.

7. The oxygen-enriched air central delivery system according to claim 1, characterized in that: The circulating water tank is also equipped with an automatic water replenishment valve, a drain solenoid valve, and a liquid level control device.

8. The oxygen-enriched air central delivery system according to claim 7, characterized in that: The liquid level control device is a liquid level controller or a float valve.

9. The oxygen-enriched air central delivery system according to claim 1, characterized in that: The high-pressure centrifugal fan is equipped with a tangential air intake air suspension bearing.

10. The oxygen-enriched air central delivery system according to claim 1, characterized in that: The system includes at least two sets of oxygen-enriched air generating devices connected in series.

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