Energy-saving variable frequency pressure adsorption oxygen generator, nitrogen generator and control method

Abstract

The present invention relates to the technical field of pressure swing adsorption gas production, and discloses an energy-saving variable frequency pressure swing adsorption oxygen generator, nitrogen generator and control method, including: a variable frequency air compressor, a gas valve assembly, an adsorption tower and a control device; the variable frequency air compressor, the gas valve assembly and the adsorption tower are connected in sequence, the pipeline connected between the gas valve assembly and the adsorption tower is an aluminum alloy pipeline, the gas outlet of the adsorption tower is connected to the gas use end, the gas valve assembly can switch between opening and closing, and can adjust the size of the air inlet caliber; the control device is respectively connected to the variable frequency air compressor, the adsorption tower and the gas valve assembly. The oxygen generator or nitrogen generator of the present invention can accurately adjust the corresponding gas valve assembly caliber and opening time according to the required gas consumption, thereby greatly improving the utilization rate of compressed air by the adsorption tower, reducing the use of raw compressed air, and effectively reducing the power of the variable frequency air compressor to achieve energy saving effect; and the aluminum alloy pipeline does not need surface spraying, is simple to assemble, and is easy to install and maintain.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure swing adsorption gas making, and in particular to an energy-saving variable frequency pressure swing adsorption oxygen making machine, a nitrogen making machine and a control method thereof. Background Art

[0002] At present, the structural principles of pressure swing adsorption nitrogen generators or pressure swing adsorption oxygen generators are basically the same. They mainly use molecular sieves to adsorb and release other gases from the air through the principle of pressure adsorption and pressure reduction desorption to separate nitrogen or oxygen. When the molecular sieves filled in the adsorption tower of the gas generator are different, the gas produced by the gas generator is different: when the carbon molecular sieve for nitrogen production is filled, the micropores on the surface of the carbon molecular sieve mainly adsorb oxygen, and nitrogen is enriched to produce nitrogen; when the zeolite molecular sieve is filled, the zeolite molecular sieve mainly adsorbs nitrogen, and oxygen is enriched to produce oxygen; both require compressed air to produce gas. Most of the pressure swing adsorption nitrogen generators or oxygen generators on the market now are fixed frequency. When the actual nitrogen or oxygen consumption of the user decreases, the gas generator still consumes the same amount of compressed air. The consumption of compressed air cannot be reduced according to the reduction in nitrogen or oxygen production. The air compressor will always be in a full-load state and cannot achieve energy-saving effects.

[0003] In addition, the internal pipelines of the PSA oxygen generator or nitrogen generator on the market are mostly seamless steel pipes, which have many disadvantages in production, processing and use as follows:

[0004] 1) The internal smoothness of the pipe is not enough, resulting in greater air flow resistance, which will consume some energy;

[0005] 2) Pipes need to be welded or threaded, which makes installation slow;

[0006] 3) The density of the paint sprayed on the pipeline is not enough, and the surface is prone to corrosion in the later stage;

[0007] 4) It is inconvenient to spray after the pipeline is completed: the finished pipeline needs to be sprayed on the surface. Due to environmental factors, most oxygen or nitrogen generator manufacturers do not have the spraying qualifications and cannot spray during installation by themselves. This is also a major obstacle in the production process of many manufacturers; if outsourced spraying is used, the valves already installed on the pipeline cannot withstand the high temperature required for spraying; even if the high temperature problem is overcome, the already produced pipelines need to be dismantled and then sprayed before installation, which also brings many inconveniences to production management. Summary of the invention

[0008] The purpose of the present invention is to design an energy-saving variable frequency pressure swing adsorption oxygen generator and nitrogen generator.

[0009] In order to achieve the above object, the present invention provides an energy-saving variable frequency pressure swing adsorption oxygen generator, comprising:

[0010] Variable frequency air compressor, air valve assembly, adsorption tower and control device;

[0011] The variable frequency air compressor, the air valve assembly, and the adsorption tower are connected in sequence, the air outlet of the adsorption tower is used to be connected to the air user end, and the air valve assembly can be switched between open and closed, and the size of the air inlet diameter can be adjusted;

[0012] The control device is respectively connected to the variable frequency air compressor, the adsorption tower and the air valve assembly for communication, and the control device is configured to:

[0013] Determine the required gas production level according to the required gas consumption of the gas user and a preset first relationship table, wherein the first relationship table records the corresponding relationship between the gas consumption and the gas production level;

[0014] The air inlet diameter size of the air valve assembly and the opening time of the air valve assembly are determined according to the determined required gas production level and a preset second relationship table, wherein the second relationship table records the correspondence between the gas production level and the air inlet diameter size of the air valve assembly and the opening time of the air valve assembly.

[0015] Preferably, the energy-saving variable frequency pressure swing adsorption oxygen generator comprises a double array of the adsorption towers, wherein a molecular sieve for adsorbing gas is arranged in the adsorption tower, and the molecular sieve is a zeolite molecular sieve.

[0016] Preferably, the gas valve assembly includes a main gas valve and a plurality of ventilation valves, the air inlet of the main gas valve is connected to the variable frequency air compressor, and the air outlet of the main gas valve is connected to each of the adsorption towers through each of the ventilation valves;

[0017] The main air valve can adjust the size of the air inlet caliber to control the total air intake volume passing through the adsorption tower; the ventilation valve can be switched between open and closed to control the adsorption time of the adsorption tower.

[0018] Preferably, the main gas valve and the ventilation valve, the ventilation valve and the adsorption tower, and the adsorption towers are all connected through pipelines, and the pipelines are aluminum alloy pipelines.

[0019] Preferably, it includes a base and two adsorption towers spaced apart on the base, the base is provided with a first bracket extending upward perpendicularly to the base for supporting the pipeline, a cross bar is provided between the two adsorption towers, and a second bracket extending downward for fixing the pipeline is provided in the middle of the cross bar.

[0020] Preferably, a gas buffer tank, a flow meter and a gas storage tank are sequentially connected between the adsorption tower and the gas consumption end. The flow meter is communicatively connected with the control device, and the flow meter is used to detect the flow value of the required gas consumption.

[0021] The present invention also provides an energy-saving variable frequency and variable pressure adsorption nitrogen generator, a variable frequency air compressor, a gas valve assembly, an adsorption tower and a control device;

[0022] The variable frequency air compressor, the air valve assembly, and the adsorption tower are connected in sequence, the air outlet of the adsorption tower is used to be connected to the air user end, and the air valve assembly can be switched between open and closed, and the size of the air inlet diameter can be adjusted;

[0023] The control device is respectively connected to the variable frequency air compressor, the adsorption tower and the air valve assembly for communication, and the control device is configured to:

[0024] Determine the required gas production level according to the required gas consumption of the gas user and a preset first relationship table, wherein the first relationship table records the corresponding relationship between the gas consumption and the gas production level;

[0025] The air inlet diameter size of the air valve assembly and the opening time of the air valve assembly are determined according to the determined required gas production level and a preset second relationship table, wherein the second relationship table records the correspondence between the gas production level and the air inlet diameter size of the air valve assembly and the opening time of the air valve assembly.

[0026] Preferably, the energy-saving variable frequency pressure swing adsorption nitrogen generator comprises a double array of the adsorption towers, wherein a molecular sieve for adsorbing gas is arranged in the adsorption tower, and the molecular sieve is a carbon molecular sieve.

[0027] Preferably, the gas valve assembly includes a main gas valve and a plurality of ventilation valves, the air inlet of the main gas valve is connected to the variable frequency air compressor, and the air outlet of the main gas valve is connected to each of the adsorption towers through each of the ventilation valves;

[0028] The main air valve can adjust the size of the air inlet caliber to control the total air intake volume passing through the adsorption tower; the ventilation valve can be switched between open and closed to control the adsorption time of the adsorption tower.

[0029] Preferably, the main gas valve and the ventilation valve, the ventilation valve and the adsorption tower, and the adsorption towers are all connected through pipelines, and the pipelines are aluminum alloy pipelines.

[0030] Preferably, it includes a base and two adsorption towers spaced apart on the base, the base is provided with a first bracket extending upward perpendicularly to the base for supporting the pipeline, a cross bar is provided between the two adsorption towers, and a second bracket extending downward for fixing the pipeline is provided in the middle of the cross bar.

[0031] Preferably, a gas buffer tank, a flow meter and a gas storage tank are sequentially connected between the adsorption tower and the gas consumption end. The flow meter is communicatively connected with the control device, and the flow meter is used to detect the flow value of the required gas consumption.

[0032] The present invention also provides a control method for an energy-saving variable frequency pressure swing adsorption oxygen generator or nitrogen generator, comprising the following steps:

[0033] Determine the required gas production level according to the gas consumption required by the user's gas consumption end and a preset first relationship table, wherein the first relationship table records the corresponding relationship between the gas consumption and the gas production level;

[0034] Determine the size of the air inlet caliber of the air valve assembly and the opening time of the air valve assembly according to the determined required air production level and a preset second relationship table, wherein the second relationship table records the corresponding relationship between the air production level and the size of the air inlet caliber of the air valve assembly and the opening time of the air valve assembly;

[0035] The control valve assembly is adjusted to a certain air inlet diameter and a certain opening time, so that the gas production of the oxygen generator or nitrogen generator is equal to the required gas consumption.

[0036] Preferably, the specific steps of obtaining the preset second relationship table are as follows:

[0037] S1 determines the optimal adsorption cycle and ideal adsorption pressure based on the performance of the molecular sieve in the adsorption tower;

[0038] S2 determines the maximum gas production level of the adsorption tower: adjust the caliber of the main gas valve to the maximum size, and control the adsorption time of the adsorption tower by controlling the opening of the ventilation valve. When the adsorption time of the adsorption tower reaches the optimal adsorption cycle, the gas production of the adsorption tower is the maximum gas production level value, the maximum caliber size of the main gas valve is the inlet caliber size of the corresponding gas valve assembly, and the adsorption time of the adsorption tower is the opening time of the corresponding gas valve assembly;

[0039] S3 determines the minimum gas production level of the adsorption tower: adjust the total gas valve caliber size multiple times to conduct experiments until the adsorption time of the adsorption tower is equal to the optimal adsorption period and the gas pressure value in the tower is equal to the ideal adsorption pressure. At this time, the gas production of the adsorption tower is the minimum gas production level value. At this time, the total gas valve caliber is the inlet caliber size of the corresponding gas valve assembly and is the minimum limit size of gas production. At this time, the adsorption time of the adsorption tower is the opening time of the corresponding gas valve assembly.

[0040] S4 determines the intermediate gas production gear of the adsorption tower: the diameter size of the total gas valve is adjusted between the maximum diameter size and the minimum limit diameter size of the total gas valve. When the gas pressure value in the adsorption tower reaches the ideal adsorption pressure, the gas production of the adsorption tower is one of the intermediate gas production gear positions of the adsorption tower. At this time, the corresponding diameter size of the total gas valve is the inlet diameter size of the corresponding gas valve assembly. At this time, the adsorption time used by the corresponding adsorption tower is the opening time of the corresponding gas valve assembly.

[0041] S5 repeats S4 to obtain multiple groups of intermediate gas production levels and their corresponding data, and combines S2 and S3 to establish the second relationship table.

[0042] Compared with the prior art, the energy-saving variable frequency pressure swing adsorption oxygen generator, nitrogen generator and control method thereof in the embodiment of the present invention have the following beneficial effects:

[0043] The oxygen generator or nitrogen generator of the embodiment of the present invention is provided with a variable frequency air compressor and a gas valve assembly capable of adjusting the flow rate of compressed air. The corresponding gas valve assembly caliber and opening time can be precisely adjusted according to the required gas consumption, thereby greatly improving the utilization rate of compressed air by the adsorption tower, reducing the usage of raw compressed air, and effectively reducing the power of the variable frequency air compressor to achieve energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a flow chart of an energy-saving variable frequency pressure swing adsorption oxygen generator or nitrogen generator according to an embodiment of the present invention;

[0045] Figure 2 2 is a schematic structural diagram of an energy-saving variable frequency pressure swing adsorption oxygen generator or nitrogen generator according to an embodiment of the present invention;

[0046] Figure 3 It is an enlarged view of the adsorption tower part of the energy-saving variable frequency pressure swing adsorption oxygen generator or nitrogen generator according to an embodiment of the present invention;

[0047] Figure 4 It is a partial process flow chart of the adsorption tower of the energy-saving variable frequency pressure swing adsorption oxygen generator or nitrogen generator according to an embodiment of the present invention.

[0048] In the figure, 1. variable frequency air compressor; 2. air valve assembly; 21. main air valve; 22. ventilation valve; 3. adsorption tower; 4. control device; 5. pipeline; 6. base; 61. first bracket; 62. second bracket; 63. cross bar; 7. flow meter; 81. gas buffer tank; 82. gas storage tank; 91. air purification device; 92. air buffer tank; 10. gas using end. DETAILED DESCRIPTION

[0049] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0050] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0051] In the description of the present invention, it should be understood that the terms "connected", "connected", "fixed" and the like used in the present invention should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a welding connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] The present invention uses the terms "first", "second", etc. to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0053] like Figure 1 As shown, an energy-saving variable frequency pressure swing adsorption oxygen generator according to a preferred embodiment of the present invention comprises:

[0054] Variable frequency air compressor 1, air valve assembly 2, adsorption tower 3 and control device 4;

[0055] The variable frequency air compressor 1, the air valve assembly 2, and the adsorption tower 3 are connected in sequence, the air outlet of the adsorption tower 3 is used to be connected to the air use end 10, and the air valve assembly 2 can be switched between open and closed, and the size of the air inlet diameter can be adjusted;

[0056] The control device 4 is respectively connected to the variable frequency air compressor 1, the adsorption tower 3 and the air valve assembly 2 for communication, and the control device 4 is configured to:

[0057] Determine the required gas production level according to the required gas consumption of the gas user 10 and a preset first relationship table, wherein the first relationship table records the corresponding relationship between the gas consumption and the gas production level;

[0058] The air inlet diameter size of the air valve assembly 2 and the opening time of the air valve assembly 2 are determined according to the determined required gas production gear and a preset second relationship table, wherein the second relationship table records the correspondence between the gas production gear and the air inlet diameter size of the air valve assembly 2 and the opening time of the air valve assembly 2.

[0059] The first relationship table records several gears and the gas production range values ​​corresponding to each gear. The control device 4 will select the corresponding gear according to the gas production range of the required gas volume; the second relationship table records the caliber size of the gas valve assembly 2 corresponding to each gear to control the compressed air flow entering the adsorption tower 3, and also records the opening time of the gas valve assembly 2 to control the adsorption time of the adsorption tower 3.

[0060] When the diameter of the air valve assembly 2 becomes smaller, the compressed air entering the adsorption tower 3 becomes less, and the variable frequency air compressor 1 senses that the air consumption is reduced and automatically adjusts its own power to reduce energy consumption, thereby achieving energy saving effect.

[0061] Furthermore, the energy-saving variable frequency pressure swing adsorption oxygen generator includes a double array of the adsorption towers 3, wherein the adsorption towers 3 are provided with a molecular sieve for adsorbing gas, and the molecular sieve is a zeolite molecular sieve. Two adsorption towers 3 form a group, and multiple groups of adsorption towers can improve the gas production efficiency; the zeolite molecular sieve mainly adsorbs nitrogen under pressure control and can be used to prepare oxygen.

[0062] Further, such as Figure 4 As shown, the gas valve assembly 2 includes a main gas valve 21 and a plurality of ventilation valves 22, the air inlet of the main gas valve 21 is connected to the variable frequency air compressor 1, and the air outlet of the main gas valve 21 is connected to each of the adsorption towers 3 through each of the ventilation valves 22;

[0063] The main air valve 21 can adjust the size of the air intake port to control the total air intake volume passing through the adsorption tower 3 ; the ventilation valve 22 can be switched between open and closed to control the adsorption time of the adsorption tower 3 .

[0064] The air outlet of the main air valve 21 is divided into multiple branches, which are connected to the corresponding adsorption towers 3 through the ventilation valves 22 respectively. The working state of the adsorption tower 3 is switched by controlling the opening and closing of the ventilation valves 22: when the ventilation valve 22 corresponding to a certain adsorption tower 3 is opened, the adsorption tower 3 is in a pressurized adsorption state; when the ventilation valve 22 corresponding to a certain adsorption tower 3 is closed, the adsorption tower 3 is in a reduced-pressure desorption state.

[0065] Further, such as Figure 3 As shown, the main gas valve 21 and the ventilation valve 22 , the ventilation valve 22 and the adsorption tower 3 , and the adsorption towers 3 are all connected through the pipeline 5 , and the pipeline 5 is an aluminum alloy pipeline 5 .

[0066] An anti-oxidation film will naturally form on the surface of the aluminum alloy pipeline 5, which can improve its surface hardness. It also has corrosion resistance and wear resistance. It does not require surface spraying, and can completely solve the spraying problem of gas production equipment manufacturers. The inner wall of the aluminum alloy pipeline 5 is smooth, resulting in small airflow resistance and a small and constant pressure drop. Compared with steel pipes that will rust and cause the inner wall to thicken and increase the pressure drop, the aluminum alloy pipeline 5 can save more energy.

[0067] The aluminum alloy pipelines 5 are connected and sealed by joints and O-rings, and are not prone to air leakage. However, common steel pipes may have leakage points due to corrosion or thermal expansion and contraction, resulting in increased energy consumption. The aluminum alloy pipelines 5 have strong oxidizing properties and are not easy to rust, and no impurities will be mixed into the gas to affect downstream equipment. At the same time, the aluminum alloy pipelines 5 can be simply assembled, are light in weight, and do not require welding or gluing. On the one hand, this improves the installation efficiency of equipment manufacturing, and on the other hand, it can be disassembled and reinstalled, which is convenient for maintenance and transportation.

[0068] Furthermore, it includes a base 6 and two adsorption towers 3 spaced apart on the base 6, the base 6 is provided with a first bracket 61 extending upward perpendicularly to the base 6 for supporting the pipeline 5, a cross bar 63 is provided between the two adsorption towers 3, and a second bracket 62 extending downward for fixing the pipeline 5 is provided in the middle of the cross bar 63.

[0069] Since the aluminum alloy pipeline 5 has a certain self-weight, adding a bracket can make the overall structure of the pipeline 5 more solid and prevent the pipeline 5 from being deformed due to gravity.

[0070] Furthermore, the main air valve 21 is a pneumatic angle seat valve with a flow regulating device, which can accurately regulate the flow of compressed air entering the adsorption tower 3.

[0071] Further, such as Figure 2 As shown, the adsorption tower 3 and the gas end 10 are connected in sequence with a gas buffer tank 81, a flow meter 7 and a gas storage tank 82, and the flow meter 7 is connected to the control device 4 for communication, and the flow meter 7 is used to detect the flow value of the required gas consumption. The gas storage tank 82 is in a fully loaded state, and the gas storage tank 82 is connected to the gas end 10. When the gas consumption required by the gas end 10 decreases, the gas flow through the gas storage tank 82 decreases. Because the flow value measured by the flow meter 7 decreases, the control device 4 further adjusts the main gas valve 21 to be smaller in diameter and shortens the opening time of the ventilation valve 22, thereby reducing the gas production of the oxygen generator.

[0072] Furthermore, an air purification device 91 and an air buffer tank 92 are sequentially connected between the variable frequency air compressor 1 and the air valve assembly 2 to further process the compressed air generated by the air compressor to ensure stable operation of the adsorption tower 3.

[0073] The present invention also provides an energy-saving variable frequency pressure swing adsorption nitrogen generator. When preparing nitrogen, the molecular sieve used for adsorbing gas in the adsorption tower 3 is a carbon molecular sieve. The remaining principles and structures of the nitrogen generator are the same as those of the above oxygen generator, so they are not repeated.

[0074] The present invention also provides a control method for an energy-saving variable frequency pressure swing adsorption oxygen generator or nitrogen generator, comprising the following steps:

[0075] Determine the required gas production level according to the gas consumption required by the user's gas consumption end and a preset first relationship table, wherein the first relationship table records the corresponding relationship between the gas consumption and the gas production level;

[0076] Determine the size of the air inlet caliber of the air valve assembly and the opening time of the air valve assembly according to the determined required air production level and a preset second relationship table, wherein the second relationship table records the corresponding relationship between the air production level and the size of the air inlet caliber of the air valve assembly and the opening time of the air valve assembly;

[0077] The control valve assembly is adjusted to a certain air inlet diameter and a certain opening time, so that the gas production of the oxygen generator or nitrogen generator is equal to the required gas consumption.

[0078] Furthermore, the specific steps of obtaining the preset second relationship table are as follows:

[0079] S1 determines the optimal adsorption cycle and ideal adsorption pressure based on the performance of the molecular sieve in the adsorption tower;

[0080] S2 determines the maximum gas production level of the adsorption tower: adjust the caliber of the main gas valve to the maximum size, and control the adsorption time of the adsorption tower by controlling the opening of the ventilation valve. When the adsorption time of the adsorption tower reaches the optimal adsorption cycle, the gas production of the adsorption tower is the maximum gas production level value, the maximum caliber size of the main gas valve is the inlet caliber size of the corresponding gas valve assembly, and the adsorption time of the adsorption tower is the opening time of the corresponding gas valve assembly;

[0081] S3 determines the minimum gas production level of the adsorption tower: adjust the total gas valve caliber size multiple times to conduct experiments until the adsorption time of the adsorption tower is equal to the optimal adsorption period and the gas pressure value in the tower is equal to the ideal adsorption pressure. At this time, the gas production of the adsorption tower is the minimum gas production level value. At this time, the total gas valve caliber is the inlet caliber size of the corresponding gas valve assembly and is the minimum limit size of gas production. At this time, the adsorption time of the adsorption tower is the opening time of the corresponding gas valve assembly.

[0082] S4 determines the intermediate gas production gear of the adsorption tower: the diameter size of the total gas valve is adjusted between the maximum diameter size and the minimum limit diameter size of the total gas valve. When the gas pressure value in the adsorption tower reaches the ideal adsorption pressure, the gas production of the adsorption tower is one of the intermediate gas production gear positions of the adsorption tower. At this time, the corresponding diameter size of the total gas valve is the inlet diameter size of the corresponding gas valve assembly. At this time, the adsorption time used by the corresponding adsorption tower is the opening time of the corresponding gas valve assembly.

[0083] S5 repeats S4 to obtain multiple groups of intermediate gas production levels and their corresponding data, and combines S2 and S3 to establish the second relationship table.

[0084] If step S4 is repeated a large number of times, the one-to-one correspondence between each gas production level of the oxygen generator or nitrogen generator, the opening time of the ventilation valve 22 and the caliber of the main gas valve 21 can be obtained more accurately, so that linear frequency conversion can be achieved.

[0085] The working process of the present invention is as follows: when the required gas volume decreases, the flow meter 7 transmits the measured required gas volume value to the control device 4, and the control device 4 determines the gear position of the required gas volume at this time according to the first relationship table, and then adjusts the caliber size of the main gas valve 21 and the opening time of the ventilation valve 22 according to the second relationship table.

[0086] In summary, the embodiment of the present invention provides an energy-saving variable frequency pressure swing adsorption oxygen generator, nitrogen generator and control method. The oxygen generator or nitrogen generator of the present invention is provided with a variable frequency air compressor 1, a gas valve assembly 2 and a flow meter 7 that can adjust the flow rate of compressed air. The corresponding gas valve assembly 2 caliber and opening time can be accurately adjusted according to the real-time required gas volume measured by the flow meter 7, thereby greatly improving the utilization rate of compressed air by the adsorption tower 3, reducing the use of raw compressed air, and effectively reducing the power of the variable frequency air compressor 1 to achieve energy saving effect. At the same time, the adsorption tower 3 is connected to the gas valve assembly 2 through an aluminum alloy pipeline 5, which reduces air flow resistance, does not require spraying and is not easy to corrode, and is convenient for production, installation and maintenance while reducing the energy consumption of gas circulation in the pipeline.

[0087] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A control method for an energy-saving variable frequency pressure swing adsorption oxygen generator, characterized in that: The energy-saving variable frequency pressure swing adsorption oxygen generator comprises: Variable frequency air compressor, air valve assembly, adsorption tower and control device; The variable frequency air compressor, the air valve assembly, and the adsorption tower are connected in sequence, the air outlet of the adsorption tower is used to be connected to the air user end, and the air valve assembly can be switched between open and closed, and the size of the air inlet diameter can be adjusted; The control device is respectively connected to the variable frequency air compressor, the adsorption tower and the air valve assembly for communication; The control method used by the control device comprises the following steps: Determine the required gas production level according to the gas consumption required by the user's gas consumption end and a preset first relationship table, wherein the first relationship table records the corresponding relationship between the gas consumption and the gas production level; Determine the size of the air inlet caliber of the air valve assembly and the opening time of the air valve assembly according to the determined required air production level and a preset second relationship table, wherein the second relationship table records the corresponding relationship between the air production level and the size of the air inlet caliber of the air valve assembly and the opening time of the air valve assembly; The control valve assembly is adjusted to a certain air inlet diameter and a certain opening time, so that the gas production of the oxygen concentrator is equal to the required gas consumption; The specific steps of obtaining the preset second relationship table are as follows: S1 determines the optimal adsorption cycle and ideal adsorption pressure based on the performance of the molecular sieve in the adsorption tower; S2 determines the maximum gas production level of the adsorption tower: adjust the caliber of the main gas valve to the maximum size, and control the adsorption time of the adsorption tower by controlling the opening of the ventilation valve. When the adsorption time of the adsorption tower reaches the optimal adsorption cycle, the gas production of the adsorption tower is the maximum gas production level value, the maximum caliber size of the main gas valve is the inlet caliber size of the corresponding gas valve assembly, and the adsorption time of the adsorption tower is the opening time of the corresponding gas valve assembly; S3 determines the minimum gas production level of the adsorption tower: adjust the total gas valve caliber size multiple times to conduct experiments until the adsorption time of the adsorption tower is equal to the optimal adsorption period and the gas pressure value in the tower is equal to the ideal adsorption pressure. At this time, the gas production of the adsorption tower is the minimum gas production level value. At this time, the total gas valve caliber is the inlet caliber size of the corresponding gas valve assembly and is the minimum limit size of gas production. At this time, the adsorption time of the adsorption tower is the opening time of the corresponding gas valve assembly. S4 determines the intermediate gas production gear of the adsorption tower: the diameter size of the total gas valve is adjusted between the maximum diameter size and the minimum limit diameter size of the total gas valve. When the gas pressure value in the adsorption tower reaches the ideal adsorption pressure, the gas production of the adsorption tower is one of the intermediate gas production gear positions of the adsorption tower. At this time, the corresponding diameter size of the total gas valve is the inlet diameter size of the corresponding gas valve assembly. At this time, the adsorption time used by the corresponding adsorption tower is the opening time of the corresponding gas valve assembly. S5 repeats S4 to obtain multiple groups of intermediate gas production levels and their corresponding data, and combines S2 and S3 to establish the second relationship table.

2. The control method of the energy-saving variable frequency pressure swing adsorption oxygen generator according to claim 1 is characterized in that: The energy-saving variable frequency pressure swing adsorption oxygen generator comprises a double array of adsorption towers, wherein a molecular sieve for adsorbing gas is arranged in the adsorption tower, and the molecular sieve is a zeolite molecular sieve.

3. The control method of the energy-saving variable frequency pressure swing adsorption oxygen generator according to claim 2 is characterized in that: The gas valve assembly includes a main gas valve and a plurality of ventilation valves, the air inlet of the main gas valve is connected to the variable frequency air compressor, and the air outlet of the main gas valve is connected to each of the adsorption towers through each of the ventilation valves; The main air valve can adjust the size of the air inlet caliber to control the total air intake volume passing through the adsorption tower; the ventilation valve can be switched between open and closed to control the adsorption time of the adsorption tower.

4. The control method of the energy-saving variable frequency pressure swing adsorption oxygen generator according to claim 3 is characterized in that: The main gas valve and the ventilation valve, the ventilation valve and the adsorption tower, and the adsorption towers are all connected through pipelines, and the pipelines are aluminum alloy pipelines.

5. The control method of the energy-saving variable frequency pressure swing adsorption oxygen generator according to claim 4 is characterized in that: It includes a base and two adsorption towers spaced apart on the base, wherein the base is provided with a first bracket extending upward perpendicularly to the base for supporting the pipeline, a cross bar is provided between the two adsorption towers, and a second bracket extending downward for fixing the pipeline is provided in the middle of the cross bar.

6. The control method of the energy-saving variable frequency pressure swing adsorption oxygen generator according to any one of claims 1 to 5, characterized in that: A gas buffer tank, a flow meter and a gas storage tank are connected in sequence between the adsorption tower and the gas consumption end. The flow meter is communicatively connected with the control device, and the flow meter is used to detect the flow value of the required gas consumption.

7. A control method for an energy-saving variable frequency and pressure variable adsorption nitrogen generator, characterized in that: The energy-saving variable frequency pressure swing adsorption nitrogen generator comprises: Variable frequency air compressor, air valve assembly, adsorption tower and control device; The variable frequency air compressor, the air valve assembly, and the adsorption tower are connected in sequence, the air outlet of the adsorption tower is used to be connected to the air user end, and the air valve assembly can be switched between open and closed, and the size of the air inlet diameter can be adjusted; The control device is respectively connected to the variable frequency air compressor, the adsorption tower and the air valve assembly for communication; The control method used by the control device comprises the following steps: Determine the required gas production level according to the gas consumption required by the user's gas consumption end and a preset first relationship table, wherein the first relationship table records the corresponding relationship between the gas consumption and the gas production level; Determine the size of the air inlet caliber of the air valve assembly and the opening time of the air valve assembly according to the determined required air production level and a preset second relationship table, wherein the second relationship table records the corresponding relationship between the air production level and the size of the air inlet caliber of the air valve assembly and the opening time of the air valve assembly; The control valve assembly is adjusted to a certain air inlet diameter and a certain opening time, so that the gas production of the nitrogen generator is equal to the required gas consumption; The specific steps of obtaining the preset second relationship table are as follows: S1 determines the optimal adsorption cycle and ideal adsorption pressure based on the performance of the molecular sieve in the adsorption tower; S2 determines the maximum gas production level of the adsorption tower: adjust the caliber of the main gas valve to the maximum size, and control the adsorption time of the adsorption tower by controlling the opening of the ventilation valve. When the adsorption time of the adsorption tower reaches the optimal adsorption cycle, the gas production of the adsorption tower is the maximum gas production level value, the maximum caliber size of the main gas valve is the inlet caliber size of the corresponding gas valve assembly, and the adsorption time of the adsorption tower is the opening time of the corresponding gas valve assembly; S3 determines the minimum gas production level of the adsorption tower: adjust the total gas valve caliber size multiple times to conduct experiments until the adsorption time of the adsorption tower is equal to the optimal adsorption period and the gas pressure value in the tower is equal to the ideal adsorption pressure. At this time, the gas production of the adsorption tower is the minimum gas production level value. At this time, the total gas valve caliber is the inlet caliber size of the corresponding gas valve assembly and is the minimum limit size of gas production. At this time, the adsorption time of the adsorption tower is the opening time of the corresponding gas valve assembly. S4 determines the intermediate gas production gear of the adsorption tower: the diameter size of the total gas valve is adjusted between the maximum diameter size and the minimum limit diameter size of the total gas valve. When the gas pressure value in the adsorption tower reaches the ideal adsorption pressure, the gas production of the adsorption tower is one of the intermediate gas production gear positions of the adsorption tower. At this time, the corresponding diameter size of the total gas valve is the inlet diameter size of the corresponding gas valve assembly. At this time, the adsorption time used by the corresponding adsorption tower is the opening time of the corresponding gas valve assembly. S5 repeats S4 to obtain multiple groups of intermediate gas production levels and their corresponding data, and combines S2 and S3 to establish the second relationship table.

8. The control method of the energy-saving variable frequency pressure swing adsorption nitrogen generator according to claim 7 is characterized in that: The energy-saving variable frequency pressure swing adsorption nitrogen generator comprises a double array of adsorption towers, wherein a molecular sieve for adsorbing gas is arranged in the adsorption tower, and the molecular sieve is a carbon molecular sieve.

9. The control method of the energy-saving variable frequency pressure swing adsorption nitrogen generator according to claim 8, characterized in that: The gas valve assembly includes a main gas valve and a plurality of ventilation valves, the air inlet of the main gas valve is connected to the variable frequency air compressor, and the air outlet of the main gas valve is connected to each of the adsorption towers through each of the ventilation valves; The main air valve can adjust the size of the air inlet caliber to control the total air intake volume passing through the adsorption tower; the ventilation valve can be switched between open and closed to control the adsorption time of the adsorption tower.

10. The control method of the energy-saving variable frequency pressure swing adsorption nitrogen generator according to claim 9, characterized in that: The main gas valve and the ventilation valve, the ventilation valve and the adsorption tower, and the adsorption towers are all connected through pipelines, and the pipelines are aluminum alloy pipelines.

11. The control method of the energy-saving variable frequency pressure swing adsorption nitrogen generator according to claim 10, characterized in that: It includes a base and two adsorption towers spaced apart on the base, wherein the base is provided with a first bracket extending upward perpendicularly to the base for supporting the pipeline, a cross bar is provided between the two adsorption towers, and a second bracket extending downward for fixing the pipeline is provided in the middle of the cross bar.

12. The control method of the energy-saving variable frequency pressure swing adsorption nitrogen generator according to any one of claims 7 to 11, characterized in that: A gas buffer tank, a flow meter and a gas storage tank are connected in sequence between the adsorption tower and the gas consumption end. The flow meter is communicatively connected with the control device, and the flow meter is used to detect the flow value of the required gas consumption.

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