Highly integrated small portable vpsa oxygen generator

Abstract

The application discloses a kind of highly integrated small portable VPSA oxygen generator, belong to oxygen generator production technical field, including base, molecular sieve assembly, air compression and vacuum pumping assembly, air compression and vacuum pumping assembly includes air compression cylinder, double-shaft motor, air compressor pump, vacuum pump, cooling fan and heat sink, the upper end pivot of double-shaft motor is placed in vacuum pump and is used as driving shaft, lower end pivot is placed in air compressor pump and is used as driving shaft, in heat sink, the vertical middle part of multiple circular arc heat sinks is connected with circular ring heat sink, circular ring heat sink is sleeved outside double-shaft motor, the upper part of multiple circular arc heat sinks is placed outside vacuum pump, and the lower part is placed outside air compressor pump;Molecular sieve assembly includes molecular sieve cylinder, upper end cover, upper rotary valve, lower end cover, lower rotary valve, transmission shaft and rotary valve driving motor.The application realizes the purposes of significantly reducing the volume of oxygen generator and significantly improving the heat dissipation effect, and users can easily carry it.

Description

Technical Field

[0001] This invention belongs to the field of oxygen concentrator manufacturing technology, specifically relating to a small portable VPSA oxygen concentrator, and more particularly to a highly integrated small portable VPSA oxygen concentrator. Background Technology

[0002] Currently, the main types of oxygen concentrators on the market are PSA oxygen concentrators and VPSA oxygen concentrators. PSA, or Pressure Swing Adsorption, is a process for purifying gas mixtures. This process is based on the physical adsorption of gas molecules on the internal surface of a porous solid material (adsorbent), and is a reversible physical adsorption process operating between two pressure states. A PSA oxygen concentrator uses specialized PSA molecular sieves to selectively adsorb impurities such as nitrogen, carbon dioxide, and water from the air under normal temperature and pressure conditions, thereby obtaining oxygen with relatively high purity (93% ± 2%). VPSA, or Vacuum Desorption Pressure Swing Adsorption, adds vacuum suction to PSA to improve gas adsorption capacity. A VPSA oxygen concentrator also uses specialized VPSA molecular sieves to selectively adsorb impurities such as nitrogen, carbon dioxide, and water from the air under normal temperature and pressure conditions, thereby obtaining oxygen with relatively high purity (93% ± 2%).

[0003] Because VPSA oxygen concentrators require a vacuum device, which increases their size and weight, traditional small portable oxygen concentrators are PSA oxygen concentrators. These oxygen concentrators are fine to use in low-altitude areas, but when used in high-altitude areas, the reduced air pressure results in lower oxygen production efficiency and oxygen purity. If a traditional VPSA oxygen concentrator is used, it will be larger, heavier, and less portable.

[0004] Therefore, traditional small oxygen concentrators cannot solve the problem of minimizing size and weight while ensuring high oxygen production efficiency and high oxygen purity. They also cannot solve the problem of efficient heat dissipation of various components after high integration, making them particularly unsuitable for use in high-altitude areas. Summary of the Invention

[0005] The purpose of this invention is to provide a small, portable VPSA oxygen generator that is small in size, has high oxygen production efficiency and oxygen purity, and can efficiently dissipate heat, in order to solve the above problems.

[0006] The present invention achieves the above objectives through the following technical solutions:

[0007] A highly integrated, small, portable VPSA oxygen concentrator includes a base and a molecular sieve assembly. The base has a first and a second base cavity, both open at the top and interconnected. The concentrator also includes an air compression and vacuum assembly, comprising an air compressor cylinder, a dual-shaft motor, an air compressor pump, a vacuum pump, a cooling fan, and a heat sink. The vertically oriented air compressor cylinder has an air outlet at its upper end. The cooling fan is installed in the upper part of the air compressor cylinder with its inlet facing downwards and its outlet facing upwards. The vacuum pump, the dual-shaft motor, and the air compressor pump are sequentially installed in the lower middle part of the air compressor cylinder. The upper shaft of the dual-shaft motor is housed within the vacuum pump and serves as a drive shaft. The lower shaft of the dual-axis motor is placed inside the air compressor and used as a drive shaft. The heat sink includes an annular heat sink and an arc-shaped heat sink. The vertical height of the arc-shaped heat sink is greater than that of the annular heat sink. The vertical center of multiple arc-shaped heat sinks is connected to the annular heat sink and is evenly distributed in the circumferential direction. The outer periphery of the annular heat sink is provided with multiple short heat dissipation fins and forms multiple short vertical air ducts. The outer periphery of the arc-shaped heat sink is provided with multiple long heat dissipation fins and forms multiple long vertical air ducts. The annular heat sink is fitted outside the dual-axis motor and is in close contact with it. The upper part of multiple arc-shaped heat sinks is placed outside the vacuum pump and is in close contact with it. The lower part of multiple arc-shaped heat sinks is placed outside the air compressor and is in close contact with it.The molecular sieve assembly includes a molecular sieve cylinder, an upper end cap, an upper rotary valve, a lower end cap, a lower rotary valve, a drive shaft, and a rotary valve drive motor. The vertical molecular sieve cylinder contains multiple vertically penetrating molecular sieve cavities evenly distributed along the circumference. A central through-hole is formed between the multiple molecular sieve cavities, and the vertical drive shaft passes through this central through-hole. An annular space outside the multiple molecular sieve cavities within the molecular sieve cylinder forms an oxygen storage cavity. The multiple molecular sieve cavities are filled with molecular sieve packing material. The upper end cap is installed at the upper end of the molecular sieve cylinder. The upper rotary valve is located inside the upper end cap and communicates with the upper ends of the multiple molecular sieve cavities. The lower end cap is installed at the lower end of the molecular sieve cylinder. The lower rotary valve is located inside the lower end cap and communicates with the lower ends of the multiple molecular sieve cavities. The shaft of the rotary valve drive motor is connected to the lower end of the drive shaft via a transmission gear, and the lower rotary valve... The lower part of the drive shaft is connected to the upper part of the drive shaft, and the upper end of the drive shaft is connected to the upper rotary valve. The lower end cover is provided with an air interface, an oxygen interface, and a nitrogen interface. The air interface is connected to the outlet of the air compressor via an air pipe. The oxygen interface is connected to the oxygen outlet on the base via an oxygen pipe. The nitrogen interface is connected to the inlet of the vacuum pump via a nitrogen pipe. The lower end of the air compression and vacuum assembly is connected to the upper part of the inner cavity of the first base. The lower end of the molecular sieve assembly is connected to the upper part of the inner cavity of the second base. The rotary valve drive motor is mounted on the base between the inner cavities of the first and second bases. The base has an air compressor inlet that communicates with both the outside air and the inlet of the air compressor, and an air compressor filter is installed in this inlet. The base also has heat dissipation air inlets that communicate with both the outside air and the inner cavity of the second base.

[0008] In the above structure, the upper rotary valve, lower rotary valve, drive shaft, and rotary valve drive motor of the molecular sieve assembly together form an oxygen production process control system for multiple molecular sieve cavities within the molecular sieve cylinder. Since the specific control structure and process switching can have various solutions depending on actual needs, this invention does not describe the specific control structure. However, to determine its feasibility, reference can be made to patent number "ZL". The utility model patent "202221828819.3", entitled "Five-Cylinder VPSA Oxygen Generator Based on Rotary Valve Controlled Process Switching", clearly describes the specific structure and working principle of controlling the oxygen generation process switching of multiple molecular sieve cylinders through a rotary valve. The multiple (preferably five, but other numbers may be possible depending on the process division) molecular sieve cavities within the molecular sieve cylinders of this application correspond to the five molecular sieve cylinders of this utility model. The upper rotary valve of this application corresponds to the lower valve body of this utility model (the upper and lower positions are reversed because the drive motor of this application is at the lower end, while the drive motor of this utility model is at the upper end, hence the reversal of the upper and lower directions). The upper end of the multiple molecular sieve cavities of this application is also provided with end caps corresponding to the five lower end caps of this utility model. A lower adapter plate and a lower sealing gasket can also be added to this utility model. The lower rotary valve of this application corresponds to the upper valve body of this utility model. The lower end of the multiple molecular sieve cavities of this application is also provided with end caps corresponding to the five upper end caps of this utility model. The upper adapter plate and upper sealing gasket of this utility model can also be added. The drive shaft of this application corresponds to the connecting rod of this utility model. The rotary valve drive motor of this application corresponds to the stepper motor of this utility model. In addition, the upper and lower end caps of this application are not related to the upper and lower end caps of this utility model, because the upper and lower end caps of this application are integral end caps, while the upper and lower end caps of this utility model are end caps of the molecular sieve cylinders. This utility model realizes the automated and precise control of the conversion between the five oxygen production processes of the five molecular sieve cylinders: pressure equalization process, pressure building adsorption process, oxygen inlet process, vacuum desorption process, and backflushing desorption process. This application realizes the automated and precise control of the conversion between the five oxygen production processes of the five molecular sieve inner cavities: pressure equalization process, pressure building adsorption process, oxygen inlet process, vacuum desorption process, and backflushing desorption process. If the oxygen production process is different, the number of molecular sieve inner cavities will be different, and other corresponding specific structures will change accordingly, but they can all be easily realized based on the structure of this utility model.

[0009] Preferably, in order to further improve the heat dissipation effect, the inner circumferential wall of the air compressor cylinder is provided with a spiral air duct that is concave from bottom to top.

[0010] Preferably, to improve strength, the annular heat sink and the plurality of arc-shaped heat sinks are integrally formed.

[0011] Preferably, in order to achieve a reliable transmission connection, the transmission gear includes a driving gear and a driven gear, the rotating shaft of the rotary valve drive motor is connected to the driving gear, the lower end of the transmission shaft is connected to the driven gear, and the driving gear and the driven gear are meshed with each other.

[0012] Preferably, in order to achieve better oxygen filtration and flow regulation functions, the upper cover is provided with an oxygen filter, the oxygen outlet of the upper rotary valve is connected to a one-way valve and then to the inlet of the oxygen filter, the outlet of the oxygen filter is connected to the upper end of the oxygen storage cavity, and the oxygen interface is connected to a proportional regulating valve and then to the oxygen outlet interface.

[0013] Preferably, in order to achieve better heat dissipation, the lower end of the rotary valve drive motor is located between the plurality of heat dissipation air inlets on the base and the inner cavity of the first base, and a heat dissipation air filter is installed on the base inside the plurality of heat dissipation air inlets.

[0014] Preferably, in order to improve the stability of equipment operation and reduce noise, the upper end of the vacuum pump is connected to the connecting bracket through a shock absorber, the cooling fan is installed on the upper end of the connecting bracket, the air compressor cylinder is connected to the connecting bracket, the lower end of the air compressor is connected to the cavity wall of the first base cavity through a shock absorber, and the upper end of the air compressor cylinder and the upper end of the molecular sieve cylinder are connected through a connecting plate.

[0015] The beneficial effects of this invention are as follows:

[0016] This invention employs a dual-axis motor to synchronously drive an air compressor and a vacuum pump, achieving air compression and nitrogen vacuum suction functions. While achieving VPSA oxygen generation to meet the requirements of high oxygen generation efficiency and high oxygen purity, the volume of the air compression and vacuum pump components is minimized. A specially structured heat sink ensures efficient heat dissipation, guaranteeing the dual-axis motor, air compressor, and vacuum pump can operate normally for extended periods. Furthermore, by designing a specially structured molecular sieve component, its volume is minimized. Ultimately, this invention significantly reduces the size of the oxygen generator and significantly improves heat dissipation, allowing users to easily carry and use it, making it particularly suitable for use in high-altitude areas.

[0017] Further and more specific advantages of the present invention are as follows:

[0018] The heat sink, composed of annular and arc-shaped heat sinks, enables the dual-shaft motor, air compressor, and vacuum pump to transfer heat to the heat sink in a timely manner, achieving efficient heat dissipation through specific heat dissipation fins and air channels. The specific efficient heat dissipation principle is as follows: An axial flow air duct layout is adopted, with numerous radially designed heat dissipation fins. These fins have a certain height, increasing the heat dissipation area while forming internal fluid air channels. The spiral air duct on the inner wall of the air compressor cylinder ensures smoother air circulation, reducing operating noise and minimizing system vibration. The combined effect of the internal and external air channels formed by the heat dissipation fins and spiral air ducts achieves a superimposed heat dissipation effect, further improving overall and local heat dissipation. By positioning the lower end of the rotary valve drive motor between the multiple heat dissipation air inlets of the base and the inner cavity of the first base, the cooling air can carry away the heat from the rotary valve drive motor and flow through the air compressor cylinder to remove heat from the heating components before being discharged to the outside air. This improves the heat dissipation effect of the rotary valve drive motor, facilitating its efficient operation and ensuring oxygen production efficiency.

[0019] This invention integrates multiple molecular sieve cavities and an oxygen storage cavity into a larger molecular sieve cylinder, avoiding the problem of multiple smaller molecular sieve cylinders occupying a large space. By placing the oxygen storage cavity outside the multiple molecular sieve cavities, the internal space of the molecular sieve cylinder can be utilized to the maximum extent, minimizing the volume of the molecular sieve components and the entire oxygen generator. Furthermore, efficient oxygen production is achieved through an oxygen production process control device that includes an upper rotary valve, a lower rotary valve, a drive shaft, and a rotary valve drive motor. Attached Figure Description

[0020] Figure 1 This is one of the perspective views of the highly integrated small portable VPSA oxygen concentrator described in this invention;

[0021] Figure 2 This is the second perspective view of the highly integrated small portable VPSA oxygen concentrator described in this invention, and... Figure 1 Different perspectives;

[0022] Figure 3 This is a perspective view of the air compression and vacuum assembly of the highly integrated small portable VPSA oxygen generator described in this invention.

[0023] Figure 4 This is a perspective view of the air compression and vacuum assembly of the highly integrated small portable VPSA oxygen generator described in this invention, after removing the air compressor cylinder.

[0024] Figure 5 This is a perspective view of the air compressor cylinder and heat sink of the air compression and vacuum assembly of the highly integrated small portable VPSA oxygen generator described in this invention.

[0025] Figure 6This is a perspective view of the heat sink of the air compression and vacuum pumping components of the highly integrated small portable VPSA oxygen generator described in this invention.

[0026] Figure 7 This is a top view of the heat sink of the air compression and vacuum pumping components of the highly integrated small portable VPSA oxygen generator described in this invention;

[0027] Figure 8 This is a perspective view of the molecular sieve assembly of the highly integrated small portable VPSA oxygen generator described in this invention;

[0028] Figure 9 This is a perspective view of the molecular sieve assembly of the highly integrated small portable VPSA oxygen generator described in this invention, after removing the upper connecting cylinder.

[0029] Figure 10 This is a top view of the molecular sieve cylinder of the molecular sieve assembly of the highly integrated small portable VPSA oxygen generator described in this invention;

[0030] Figure 11 This is a perspective view of the base of the highly integrated small portable VPSA oxygen concentrator described in this invention. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings:

[0032] like Figures 1-11As shown, the highly integrated small portable VPSA oxygen generator of the present invention includes a base A, a molecular sieve assembly C, and an air compression and vacuum assembly B. The base A has a first base cavity 19 and a second base cavity 17 with an open top and interconnected. The air compression and vacuum assembly B includes an air compressor cylinder 31, a dual-shaft motor 42, an air compressor pump 45, a vacuum pump 39, a cooling fan 35, and a heat sink. The upper end of the vertical air compressor cylinder 31 has multiple air outlets 30, and the cooling fan 35 is installed on the air compressor cylinder 31. The upper part of the air compressor cylinder 31, with its air inlet facing downwards and its air outlet facing upwards, houses a vacuum pump 39, a dual-shaft motor 42, and an air compressor 45, which are sequentially installed in the lower middle part of the cylinder. The upper shaft of the dual-shaft motor 42 is placed inside the vacuum pump 39 as a drive shaft, and the lower shaft of the dual-shaft motor 42 is placed inside the air compressor 45 as a drive shaft. The heat sink includes a circular annular heat sink 43 and an arc-shaped arc heat sink 40. The vertical height of the arc heat sink 40 is greater than the vertical height of the annular heat sink 43. Multiple (three in the figure) circular... The vertical center of the arc-shaped heat sink 40 is connected to the annular heat sink 43 and is evenly distributed in the circumferential direction. The outer periphery of the annular heat sink 43 has multiple short heat sink fins 44 forming multiple short vertical air ducts (not marked in the figure; a short vertical air duct is formed between every two adjacent short heat sink fins 44). The outer periphery of the arc-shaped heat sink 40 has multiple long heat sink fins 41 forming multiple long vertical air ducts (not marked in the figure; a long vertical air duct is formed between every two adjacent long heat sink fins 41). The annular heat sink 43 is fitted onto the dual-axis... The upper parts of multiple arc-shaped heat sinks 40 are placed outside and in close contact with the vacuum pump 39, and the lower parts of multiple arc-shaped heat sinks 40 are placed outside and in close contact with the air compressor 45; the molecular sieve assembly C includes a molecular sieve cylinder 52, an upper end cover 50, an upper rotary valve (not shown in the figure), a lower end cover 56, a lower rotary valve (not shown in the figure), a drive shaft (not shown in the figure), and a rotary valve drive motor 53. The vertical molecular sieve cylinder 52 has multiple vertically penetrating molecular sieve cavities that are evenly distributed along the circumference. Figure 10The diagram shows five molecular sieve cavities: a first molecular sieve cavity 63, a second molecular sieve cavity 66, a third molecular sieve cavity 67, a fourth molecular sieve cavity 64, and a fifth molecular sieve cavity 62. A central through-hole 65 is formed between these cavities, and a vertical drive shaft passes through this central through-hole 65. An oxygen storage cavity 61 is formed within the molecular sieve cylinder 52, located outside the cavities. The cavities are filled with molecular sieve packing material (not shown). An upper end cap 50 is installed at the upper end of the molecular sieve cylinder 52, and an upper rotary valve is located within the upper end cap 50 and communicates with the upper ends of the cavities. A lower end cap 56 is installed at the lower end of the molecular sieve cylinder 52, and a lower rotary valve is located within the lower end cap 56 and communicates with the lower ends of the cavities. The shaft of the rotary valve drive motor 53 is connected to the lower end of the drive shaft via a transmission gear, and the lower rotary valve is connected to the drive shaft... The lower part is connected, with the upper end of the drive shaft connected to the upper rotary valve. The lower end cover 56 is provided with an air interface 57, an oxygen interface 54, and a nitrogen interface 55. The air interface 57 is connected to the air outlet 34 of the air compressor 45 through an air pipe. The oxygen interface 54 is connected to the oxygen outlet 10 on the base A through an oxygen pipe. The nitrogen interface 55 is connected to the air inlet 37 of the vacuum pump 39 through a nitrogen pipe. The lower end of the air compression and vacuum assembly B is connected to the upper part of the inner cavity 19 of the first base. The lower end of the molecular sieve assembly C is connected to the upper part of the inner cavity 17 of the second base. The rotary valve drive motor 53 is installed on the base A at a position between the inner cavity 19 of the first base and the inner cavity 17 of the second base. The base A is provided with an air compressor inlet that is connected to both the outside air and the air inlet 33 of the air compressor 45, and an air compressor filter 15 is installed in the air inlet. The base A is provided with multiple heat dissipation air inlets 14 that are connected to both the outside air and the inner cavity 17 of the second base.

[0033] In the above structure, the upper rotary valve, lower rotary valve, drive shaft, and rotary valve drive motor 53 of the molecular sieve component C together constitute an oxygen production process control system for multiple molecular sieve cavities within the molecular sieve cylinder 52. Since the specific control structure and process switching can have various solutions depending on actual needs, this invention does not describe the specific control structure. However, to determine its feasibility, reference can be made to patent number "ZL". The utility model patent 202221828819.3, entitled "Five-Cylinder VPSA Oxygen Generator Based on Rotary Valve Controlled Flow Conversion," clearly describes the specific structure and working principle of controlling the oxygen generation process conversion of multiple molecular sieve cylinders through a rotary valve. The multiple (preferably five, but other numbers may be possible depending on the process division) molecular sieve cylinder bodies 52 in this application correspond to the five molecular sieve cylinders of this utility model. The upper rotary valve in this application corresponds to the lower valve body of this utility model (the upper and lower positions are reversed because the drive motor in this application is at the lower end, while the drive motor in this utility model is at the upper end, hence the reversal of the upper and lower directions). The upper end of the multiple molecular sieve cylinders in this application is also provided with end caps corresponding to the five lower end caps of this utility model. A lower adapter plate and a lower sealing gasket can also be added to this utility model. The lower rotary valve in this application corresponds to the upper valve body of this utility model. The lower end of the multiple molecular sieve cylinders in this application is also provided with end caps corresponding to the five upper end caps of this utility model. With the addition of the upper adapter plate and upper sealing gasket of this utility model, the transmission shaft of this application corresponds to the connecting rod of this utility model, and the rotary valve drive motor 53 of this application corresponds to the stepper motor of this utility model. In addition, the upper end cover 50 and lower end cover 56 of this application are unrelated to the upper end cover and lower end cover of this utility model, because the upper end cover 50 and lower end cover 56 of this application are integral end covers, while the upper end cover and lower end cover of this utility model are end covers of molecular sieve cylinders. This utility model realizes automated and precise control of the conversion between the five oxygen production processes of the five molecular sieve cylinders: pressure equalization process, pressure building adsorption process, oxygen inlet process, vacuum desorption process, and backflushing desorption process. This application realizes automated and precise control of the conversion between the five oxygen production processes of the five molecular sieve inner cavities: pressure equalization process, pressure building adsorption process, oxygen inlet process, vacuum desorption process, and backflushing desorption process. If the oxygen production process is different, the number of molecular sieve inner cavities will be different, and other corresponding specific structures will change accordingly, but they can all be easily realized based on the structure of this utility model.

[0034] like Figures 1-11 As shown, the present invention also discloses the following more optimized specific structures:

[0035] To further improve heat dissipation, the inner circumferential wall of the air compressor cylinder 31 is provided with a spiral air duct 47 that runs from bottom to top and is concave.

[0036] To improve strength, the annular heat sink 43 and multiple arc-shaped heat sinks 40 are integrally formed.

[0037] To achieve a reliable transmission connection, the transmission gear includes a driving gear 59 and a driven gear 58. The rotating shaft of the rotary valve drive motor 53 is connected to the driving gear 59, and the lower end of the transmission shaft is connected to the driven gear 58. The driving gear 59 and the driven gear 58 are meshed together.

[0038] To achieve better oxygen filtration and flow regulation, an oxygen filter 60 is provided on the upper cover 50. The oxygen outlet of the upper rotary valve is connected to a one-way valve (not visible in the figure) and then to the inlet of the oxygen filter 60. The outlet of the oxygen filter 60 is connected to the upper end of the oxygen storage cavity 61. The oxygen interface 54 is connected to a proportional regulating valve (not visible in the figure) and then to the oxygen outlet interface 10.

[0039] To achieve better heat dissipation, the lower end of the rotary valve drive motor 53 is located between the multiple heat dissipation air inlets 14 on the base A and the inner cavity 19 of the first base. A heat dissipation air filter 21 is installed on the base A inside the multiple heat dissipation air inlets 14.

[0040] To improve equipment operational stability and reduce noise, the upper end of vacuum pump 39 is connected to connecting bracket 36 via shock absorber 32, cooling fan 35 is installed on the upper end of connecting bracket 36, air compressor cylinder 31 is connected to connecting bracket 36, the lower end of air compressor 45 is connected to the cavity wall of the inner cavity 19 of the first base via shock absorber 32, and the upper end of air compressor cylinder 31 and the upper end of molecular sieve cylinder 52 are connected via connecting plate D.

[0041] Figure 1 and Figure 11 The image also shows a start / stop button 11 and multiple indicator lights 12 located on the base A; Figure 1 and Figure 2 The image also shows a battery 13 located at the bottom of base A; Figure 2 and Figure 11 The diagram also shows an electrical interface 16 located on base A; Figure 4 The diagram also shows an exhaust muffler 38 connected to the outlet of the vacuum pump 39; Figure 5 The figure also shows a connecting lug 46 protruding from the upper end of the air compressor cylinder 31. The connecting lug 46 is connected to the upper cover plate (not marked in the figure) and multiple air outlets 30 are provided on the upper cover plate. Figure 8 The diagram also shows an upper connecting cylinder 51 located on the upper end of the upper cover 50, an oxygen filter 60 located inside the upper connecting cylinder 51, and a connecting plate D connected to the upper end of the upper connecting cylinder 51. Figure 11The diagram also shows a power filter module 20 located in the inner cavity 19 of the first base and a system drive module 18 located in the inner cavity 17 of the second base, for use with the circuit system; these structures are all conventional adaptive structures, and are only briefly introduced here without specific explanation.

[0042] like Figures 1-11 As shown, the oxygen generation principle of this invention is as follows:

[0043] Outside air enters the air compressor 45 through the air filter 15 and the air inlet 33. After compression, it enters the lower end cover 56 through the air inlet 57, and then is distributed to the corresponding molecular sieve inner cavity through the lower rotary valve for adsorption and desorption, producing oxygen (including a small amount of carbon dioxide and other gases) and nitrogen (including a small amount of carbon dioxide and other gases). The oxygen is discharged through the upper rotary valve and sent to the oxygen filter 60 for filtration, and then enters the oxygen storage inner cavity 61 for storage. When it needs to be delivered, the oxygen is delivered through the one-way valve, the oxygen inlet 54, the proportional regulating valve and the oxygen outlet 10 for use by personnel. The nitrogen is sent to the vacuum pump 39 through the nitrogen inlet 55 and the air inlet 37, is pressurized and strongly drawn in, and is delivered from the outlet of the vacuum pump 39 and the exhaust silencer 38, and is discharged into the atmosphere through the cooling fan 35.

[0044] Figure 10 The five molecular sieve cavities are the first molecular sieve cavity 63, the second molecular sieve cavity 66, the third molecular sieve cavity 67, the fourth molecular sieve cavity 64, and the fifth molecular sieve cavity 62. The oxygen production process conversion between the molecular sieve cavities is referenced to the utility model patent with patent number "ZL 202221828819.3" and title "Five-Cylinder VPSA Oxygen Generator Based on Rotary Valve Controlled Process Conversion". The first molecular sieve cavity 63, the second molecular sieve cavity 66, the third molecular sieve cavity 67, the fourth molecular sieve cavity 64, and the fifth molecular sieve cavity 62 correspond to the five molecular sieve cylinders of that patent.

[0045] like Figures 1-11 As shown, the heat dissipation principle of this invention is as follows:

[0046] Under the action of the cooling fan 35, the outside cold air first enters the base A through the cooling air inlet 14 and the cooling air filter 21. After passing through the lower end of the rotary valve driving motor 53, the heat is carried away and the air enters the lower part of the air compressor cylinder 31. Then, it passes through multiple long vertical air ducts of multiple arc-shaped heat sinks 40 and multiple short vertical air ducts of the annular heat sink 43 to form axial flow cooling air. This part of the cooling air directly carries away the heat of the heat-generating components, namely the air compressor 45, the dual-shaft motor 42 and the vacuum pump 39. At the same time, part of the air in the lower part of the air compressor cylinder 31 enters the spiral air duct 47 on the inner wall of the air compressor cylinder 31 to form spiral flow air. Since the time required for the airflow at the same velocity to pass through the unit displacement along the axis is shorter than that required for the spiral flow air, the spiral flow air has sufficient time to exchange heat with the outside and the axial flow air, thus improving the local heat dissipation efficiency.

[0047] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the technical solutions of the present invention. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of the patent of the present invention.

Claims

1. A highly integrated, small, portable VPSA oxygen generator, comprising a base and a molecular sieve assembly, characterized in that: The base has a first base cavity and a second base cavity that are open at the top and interconnected. The highly integrated small portable VPSA oxygen generator also includes an air compression and vacuum assembly. The air compression and vacuum assembly includes an air compressor cylinder, a dual-axis motor, an air compressor pump, a vacuum pump, a cooling fan, and a heat sink. The upper end of the vertical air compressor cylinder has an air outlet. The cooling fan is installed in the upper part of the air compressor cylinder with its inlet facing downwards and its outlet facing upwards. The vacuum pump, the dual-axis motor, and the air compressor pump are sequentially installed in the lower middle part of the air compressor cylinder. The upper shaft of the dual-axis motor is placed inside the vacuum pump as a drive shaft, and the lower shaft of the dual-axis motor is placed inside the vacuum pump. The air compressor pump is used as a drive shaft. The heat sink includes a circular annular heat sink and an arc-shaped arc heat sink. The vertical height of the arc heat sink is greater than that of the circular annular heat sink. The vertical center of multiple arc heat sinks is connected to the circular annular heat sink and is evenly distributed in the circumferential direction. The outer periphery of the circular annular heat sink is provided with multiple short heat dissipation fins and forms multiple short vertical air ducts. The outer periphery of the arc heat sink is provided with multiple long heat dissipation fins and forms multiple long vertical air ducts. The circular annular heat sink is fitted outside the dual-shaft motor and is in close contact with it. The upper part of the multiple arc heat sinks is placed outside the vacuum pump and is in close contact with it. The lower part of the multiple arc heat sinks is placed outside the air compressor pump and is in close contact with it.The molecular sieve assembly includes a molecular sieve cylinder, an upper end cap, an upper rotary valve, a lower end cap, a lower rotary valve, a drive shaft, and a rotary valve drive motor. The vertical molecular sieve cylinder contains multiple vertically penetrating molecular sieve cavities evenly distributed along the circumference. A central through-hole is formed between these cavities, through which the vertical drive shaft passes. An oxygen storage cavity is formed in the annular space outside the molecular sieve cavities within the molecular sieve cylinder. These cavities are filled with molecular sieve packing material. The upper end cap is installed at the upper end of the molecular sieve cylinder. The upper rotary valve is located within the upper end cap and communicates with the upper ends of the molecular sieve cavities. The lower end cap is installed at the lower end of the molecular sieve cylinder. The lower rotary valve is located within the lower end cap and communicates with the lower ends of the molecular sieve cavities. The shaft of the rotary valve drive motor is connected to the lower end of the drive shaft via a transmission gear, and the lower rotary valve is connected to the lower part of the drive shaft. The upper end of the drive shaft is connected to the upper rotary valve. The lower end cover is provided with an air interface, an oxygen interface, and a nitrogen interface. The air interface is connected to the air outlet of the air compressor through an air pipe. The oxygen interface is connected to the oxygen outlet on the base through an oxygen pipe. The nitrogen interface is connected to the air inlet of the vacuum pump through a nitrogen pipe. The lower end of the air compression and vacuum assembly is connected to the upper part of the inner cavity of the first base. The lower end of the molecular sieve assembly is connected to the upper part of the inner cavity of the second base. The rotary valve drive motor is installed on the base between the inner cavities of the first and second bases. The base is provided with an air compressor inlet that communicates with both the outside air and the air inlet of the air compressor, and an air compressor filter is installed in the inlet. The base is provided with a heat dissipation air inlet that communicates with both the outside air and the inner cavity of the second base. The inner circumference of the air compressor cylinder is provided with a spiral air duct that is concave from bottom to top.

2. The highly integrated small portable VPSA oxygen concentrator according to claim 1, characterized in that: The annular heat sink and the plurality of arc-shaped heat sinks are integrally formed.

3. The highly integrated small portable VPSA oxygen concentrator according to claim 1 or 2, characterized in that: The transmission gear includes a driving gear and a driven gear. The rotating shaft of the rotary valve drive motor is connected to the driving gear, and the lower end of the transmission shaft is connected to the driven gear. The driving gear and the driven gear are meshed with each other.

4. The highly integrated small portable VPSA oxygen concentrator according to claim 1 or 2, characterized in that: An oxygen filter is provided on the upper end cover. The oxygen outlet of the upper rotary valve is connected to a one-way valve and then to the inlet of the oxygen filter. The outlet of the oxygen filter is connected to the upper end of the oxygen storage cavity. The oxygen interface is connected to a proportional regulating valve and then to the oxygen outlet interface.

5. The highly integrated small portable VPSA oxygen concentrator according to claim 1 or 2, characterized in that: The lower end of the rotary valve drive motor is located between the plurality of heat dissipation air inlets on the base and the inner cavity of the first base. A heat dissipation air filter is installed on the base inside the plurality of heat dissipation air inlets.

6. The highly integrated small portable VPSA oxygen concentrator according to claim 1 or 2, characterized in that: The upper end of the vacuum pump is connected to the connecting bracket via a shock absorber. The cooling fan is installed on the upper end of the connecting bracket. The air compressor cylinder is connected to the connecting bracket. The lower end of the air compressor is connected to the cavity wall of the first base via a shock absorber. The upper end of the air compressor cylinder and the upper end of the molecular sieve cylinder are connected via a connecting plate.

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