Small nitrogen and oxygen preparation all-in-one machine

Abstract

The utility model relates to the technical field of nitrogen and oxygen preparation, and discloses a small nitrogen and oxygen preparation all-in-one machine which is characterized in that a pressure switch is arranged on an air storage tank and used for detecting the pressure in the air storage tank, and the pressure switch controls a second electromagnetic valve to act according to the detected pressure parameter so as to control whether compressed air is conveyed to an adsorption system or not; therefore, starting and stopping of the adsorption system are controlled, the automation degree in the nitrogen and oxygen preparation process is greatly improved, and the labor burden of workers is relieved; according to the scheme, all parts for preparing nitrogen and oxygen and parts for controlling the start and stop of the adsorption system are integrated in the equipment box, so that the overall size of the equipment is effectively reduced, the miniaturization of the equipment is facilitated, the user requirements of small equipment are met, the miniaturization requirement is met, and meanwhile, the cost is reduced. Starting and stopping of work of the adsorption system can be correspondingly controlled according to changes of air pressure in the air storage tank, and operation safety of the nitrogen and oxygen preparation equipment is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of nitrogen and oxygen preparation, in particular to a small integrated nitrogen and oxygen preparation machine. Background Art

[0002] In the pressure swing adsorption nitrogen and oxygen preparation equipment, since it includes a filter, a dryer, an adsorption device and various tanks, the cooperation of the above various devices is required during the nitrogen and oxygen preparation process; the current nitrogen and oxygen preparation equipment needs to be additionally provided with a control device to realize the automatic control of the start and stop of the adsorption system according to the change of the air pressure in the gas storage tank, so as to improve the automation degree of the equipment and the safety of the equipment operation; however, the additional setting of the control device brings great difficulties to the miniaturization of the volume of the nitrogen and oxygen preparation equipment. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a small integrated nitrogen and oxygen preparation machine, which is used to solve the problem that the existing nitrogen and oxygen preparation equipment cannot control the start and stop of the adsorption system according to the change of the air pressure in the gas storage tank on the basis of meeting the miniaturization. [[ID=IP15]]

[0004] In order to achieve the above purpose, the present application provides a small integrated nitrogen and oxygen preparation machine, including:

[0005] An air filtration system;

[0006] An adsorption system, the adsorption system has an input end and an output end, the input end of the adsorption system is connected to the air filtration system through a switch assembly, the switch assembly is used to control the connection or disconnection between the input end of the adsorption system and the air filtration system or the outside, and the adsorption system is used to adsorb nitrogen or oxygen in the air purified by the air filtration system; the output end of the adsorption system is connected to a gas storage tank and the gas storage tank is connected to an exhaust pipe, and a first electromagnetic valve is arranged between the output end of the adsorption system and the gas storage tank;

[0007] A second electromagnetic valve is arranged between the switch assembly and the air filtration system;

[0008] A pressure switch is arranged on the gas storage tank, the pressure switch is used to detect the pressure in the gas storage tank and control the conduction or disconnection between the second electromagnetic valve and the switch assembly according to the pressure change; and

[0009] An equipment box, the air filtration system, the adsorption system and the gas storage tank are all accommodated in the equipment box.

[0010] In some embodiments of the present application, a third electromagnetic valve is further arranged between the first electromagnetic valve and the gas storage tank, and the third electromagnetic valve is connected to a discharge pipe;

[0011] A sampling interface is provided between the first solenoid valve and the third solenoid valve, and a nitrogen-oxygen analyzer is connected to the sampling interface.

[0012] In some embodiments of the present application, the adsorption system includes an adsorption tower A, an adsorption tower B, and molecular sieves provided in the adsorption tower A and the adsorption tower B. The molecular sieves are nitrogen molecular sieves or oxygen molecular sieves; the input end and the output end are respectively provided at opposite ends of the adsorption tower A and opposite ends of the adsorption tower B.

[0013] The switch assembly is used to control the input ends of the adsorption tower A and the adsorption tower B not to be connected to the second solenoid valve simultaneously. The output ends of the adsorption tower A and the adsorption tower B are both connected to the first solenoid valve, and the first solenoid valve is used to control the output ends of the adsorption tower A and the adsorption tower B not to be connected to the third solenoid valve simultaneously.

[0014] In some embodiments of the present application, the switch assembly includes quick exhaust valves respectively connected to the input ends of the adsorption tower A and the adsorption tower B, and a fourth solenoid valve connected to the second solenoid valve; the quick exhaust valve has a first valve port connected to the input end, a second valve port communicating with the outside, and a third valve port connected to the fourth solenoid valve.

[0015] The quick exhaust valve is used to control the corresponding input end to communicate with the outside or with the fourth solenoid valve according to the pressure change, and the fourth solenoid valve is used to control the second solenoid valve not to communicate with the input ends of the adsorption tower A and the adsorption tower B simultaneously.

[0016] In some embodiments of the present application, the third solenoid valve, the second solenoid valve, the first solenoid valve, and the fourth solenoid valve are all two-position five-way solenoid valves.

[0017] In some embodiments of the present application, a one-way valve and a flow meter are sequentially connected between the gas storage tank and the third solenoid valve.

[0018] In some embodiments of the present application, the air filtration system includes a filtration component and a drying component connected in sequence; the filtration component includes a plurality of filters connected in sequence, and the drying component is a cold dryer; the cold dryer is connected between any two adjacent filters.

[0019] In some embodiments of the present application, the cold dryer and the plurality of filters are all commonly connected to a drain pipe.

[0020] In some embodiments of the present application, a regulating valve is provided on the exhaust pipe.

[0021] In some embodiments of the present application, heat dissipation holes are provided on the equipment box, and a heat dissipation fan is provided inside the equipment box at a position corresponding to the heat dissipation holes.

[0022] Compared with the prior art, the beneficial effects of an integrated small nitrogen and oxygen preparation machine according to an embodiment of the present utility model are as follows: In this solution, a pressure switch is provided on the gas storage tank to detect the pressure inside the gas storage tank. According to the pressure parameters detected by the pressure switch, the second solenoid valve is controlled to act to control whether compressed air is delivered to the adsorption system, thereby realizing the start and stop control of the adsorption system, greatly improving the automation degree in the nitrogen and oxygen preparation process, and reducing the labor burden of the staff; in this solution, all components for preparing nitrogen and oxygen and components for controlling the start and stop of the adsorption system are integrated inside the equipment box, which not only effectively reduces the overall volume of the equipment, helps to miniaturize it, meets the needs of users who require small equipment, but also can, while meeting the miniaturization requirements, realize the start and stop control of the adsorption system according to the change of the air pressure inside the gas storage tank, ensuring the safe operation of the nitrogen and oxygen preparation equipment; at the same time, in order to ensure the normal and stable operation of each component, heat dissipation holes are provided on the equipment box to timely discharge the heat inside the equipment box to the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the connection relationship of each component of the present utility model;

[0024] Figure 2 Schematic diagram of the enlarged structure at position A of the present utility model;

[0025] Figure 3 Schematic diagram of the structure of the equipment box of the present utility model;

[0026] Figure 4 Schematic diagram of the structure of the equipment box of the present utility model from another perspective;

[0027] Figure 5 Schematic diagram of the structure of the equipment box of the present utility model from yet another perspective;

[0028] Figure 6 Schematic diagram of the internal structure of the equipment box of the present utility model;

[0029] Figure 7 Schematic diagram of the internal structure of the equipment box of the present utility model from another perspective;

[0030] Figure 8 Schematic diagram of the internal structure of the equipment box of the present utility model from yet another perspective;

[0031] Figure 9 Schematic diagram of a connection mode of the first solenoid valve of the present utility model;

[0032] Figure 10This is a schematic diagram of another connection mode of the first solenoid valve of the present utility model.

[0033] In the figure, 1 is the exhaust pipe;

[0034] 2 is the sewage discharge pipe; 21 is the sewage discharge port;

[0035] 3 is the buffer tank; 31 is the first solenoid valve; 311 is the first pipe orifice; 312 is the second pipe orifice; 313 is the third pipe orifice; 314 is the fourth pipe orifice; 315 is the fifth pipe orifice; 316 is the cavity; 317 is the valve; 32 is the backflush pipe; 33 is the regulating valve; 34 is the input port; 35 is the output port; 36 is the backflush interface; 37 is the sampling interface;

[0036] 4 is the discharge pipe; 41 is the third solenoid valve;

[0037] 5 is the gas storage tank; 51 is the pressure switch; 52 is the check valve; 53 is the flowmeter; 54 is the air inlet; 55 is the air outlet;

[0038] 6 is the nitrogen and oxygen analyzer;

[0039] 7 is the adsorption system; 71 is the adsorption tower A; 711 is the pressure gauge of tower A; 72 is the adsorption tower B; 721 is the pressure gauge of tower B; 73 is the second solenoid valve; 74 is the quick exhaust valve; 741 is the first valve orifice; 742 is the second valve orifice; 743 is the third valve orifice; 75 is the fourth solenoid valve; 76 is the input end; 77 is the output end;

[0040] 8 is the filter; 81 is the compressed air inlet; 82 is the ball valve;

[0041] 9 is the cold dryer; 91 is the refrigerant pressure gauge; 92 is the refrigerant valve;

[0042] 10 is the equipment box; 101 is the heat dissipation hole; 102 is the power interface; 103 is the switch; 104 is the program controller; 105 is the power indicator light; 106 is the purity meter; 107 is the cooling fan. Specific embodiments

[0043] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0044] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 should not be construed as a limitation on the present utility model. It should be understood that the terms "first", "second", etc. are used in the present utility model to describe various information, but such 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 utility model, the "first" information may also be referred to as the "second" information, and similarly, the "second" information may also be referred to as the "first" information.

[0045] As Figures 1 - 10 shown, an embodiment of the present application provides a small-sized nitrogen and oxygen preparation integrated machine, which includes an air filtration system, an adsorption system 7, a gas storage tank 5, a second solenoid valve 73, a pressure switch 51, and an equipment box 10. The air filtration system has a compressed air inlet 81 (the compressed air inlet 81 is connected to the air filtration system through a ball valve 82, and the ball valve 82 is used to control the on-off between the compressed air inlet 81 and the air filtration system); the adsorption system 7 has an input end 76 and an output end 77. The input end 76 of the adsorption system 7 is connected to the air filtration system through a switch assembly, and the switch assembly is used to control the connection or disconnection between the input end 76 of the adsorption system 7 and the air filtration system or the outside. The second solenoid valve 73 is arranged between the switch assembly and the air filtration system; a first solenoid valve 31 is arranged between the gas storage tank 5 and the output end 77 of the adsorption system 7. The upper end of the gas storage tank 5 is provided with an air inlet 54 for connecting to the first solenoid valve 31. The bottom of the gas storage tank 5 is provided with an air outlet 55, and an exhaust pipe 1 is connected to the air outlet 55. A pressure detection interface is arranged on the exhaust pipe 1, and the pressure switch 51 is connected to the pressure detection interface. The pressure switch 51 is used to detect the gas pressure in the gas storage tank 51. When the pressure in the gas storage tank 51 reaches the set shutdown pressure, the pressure switch 51 controls the second solenoid valve 73 to disconnect from the switch assembly (the control circuit in the pressure switch 51 controls the second solenoid valve 73 to act, so that the second solenoid valve 73 is no longer connected to the switch assembly), and at this time the system shuts down and stops preparing nitrogen / oxygen; when the pressure in the gas storage tank 5 drops to the start set pressure, the pressure switch 51 controls the second solenoid valve 73 to connect to the switch assembly (the control circuit in the pressure switch 51 controls the second solenoid valve 73 to act, so that the second solenoid valve 73 is connected to the switch assembly), and at this time the system automatically starts and continues to prepare nitrogen / oxygen.

[0046] In this embodiment, a pressure switch 51 is provided on the gas storage tank 5 to monitor the gas pressure in the gas storage tank 5 in real time. When the gas consumption of the user decreases, the air pressure in the gas storage tank 5 increases. When the pressure increases to the set shutdown pressure, the pressure switch 51 controls the second solenoid valve 73 to disconnect from the switch assembly, thereby stopping the supply of compressed air to the adsorption system 7 and causing the adsorption system 7 to stop working, so as to avoid excessive air pressure in the gas storage tank 5 and potential safety hazards. When the pressure switch 51 detects that the air pressure in the gas storage tank 5 drops to the start set pressure, the pressure switch 51 controls the second solenoid valve 73 to conduct with the switch assembly, thereby continuing to supply compressed air to the adsorption system 7 to continue producing finished gas. In this embodiment, by setting the cooperating pressure switch 51 and the second solenoid valve 73, the start and stop of the adsorption system 7 can be automatically controlled according to the change of the user's gas consumption.

[0047] The equipment box 10 is used to accommodate the air filtration system, the adsorption system 7, and the gas storage tank 5. In this solution, all the above components are integrated in the equipment box 10, which not only effectively reduces the overall volume of the equipment, helps to miniaturize it, and meets the needs of users who require small equipment, but also while meeting the miniaturization requirements, it can control the start and stop of the adsorption system according to the change of the air pressure in the gas storage tank, ensuring the safe operation of the nitrogen and oxygen preparation equipment.

[0048] During specific implementation, the compressed air first enters the air filtration system through the compressed air inlet 81 and filters the impurities (dust, dust particles) in the compressed air and removes the moisture in the compressed air. Subsequently, the purified compressed air passes through the switch assembly and enters the adsorption system 7 from the input end 76 of the adsorption system 7. The compressed air completes the separation of nitrogen and oxygen in the adsorption system 7, that is, the adsorption system 7 adsorbs oxygen (nitrogen) in the compressed air (this process is the pressurized adsorption stage), so that nitrogen (oxygen) is discharged outward from the output end 77 of the adsorption system 7 and enters the gas storage tank 5 through the first solenoid valve 31. When the adsorption capacity of the adsorption system 7 reaches saturation, the switch assembly is controlled so that the input end 76 of the adsorption system 7 is no longer connected to the air filtration system and is switched to communicate with the outside. At the same time, the first solenoid valve 31 is controlled to close (this process is the decompression desorption stage), so that the oxygen (nitrogen) absorbed by the adsorption system 7 is released and discharged outward from the input end 76 of the adsorption system 7 until the oxygen (nitrogen) is basically released. Subsequently, the switch assembly is controlled so that the input end 76 of the adsorption system 7 is switched from communicating with the outside to communicating with the air filtration system again, and at the same time the first solenoid valve 31 is opened. The subsequent process is the same as above. Through the adsorption system 7, oxygen (nitrogen) is adsorbed so that nitrogen (oxygen) is output from the output end 77 of the adsorption system 7.

[0049] In some embodiments of the present application, the small nitrogen and oxygen preparation integrated machine further includes a third solenoid valve 41 disposed between the first solenoid valve 31 and the gas storage tank 5 (the air inlet 54 provided on the gas storage tank 5 is connected to the third solenoid valve 41), and the third solenoid valve 41 is connected to a discharge pipe 4; the small nitrogen and oxygen preparation integrated machine in this solution further includes a buffer tank 3 having an input port 34 and an output port 35. The input port 34 of the buffer tank 3 is connected to the output end 77 of the adsorption system 7 through the first solenoid valve 31, and the output port 35 of the buffer tank 3 is connected to the third solenoid valve 41; a sampling interface 37 is disposed between the output port 35 of the buffer tank 3 and the third solenoid valve 41, and the sampling interface 37 is connected to a nitrogen and oxygen analyzer 6. The nitrogen and oxygen analyzer 6 controls the third solenoid valve 41 to communicate with the discharge pipe 4 or with the gas storage tank 5 according to the purity of the detected gas; a purity meter 106 is provided on the equipment box 10 and is connected to the nitrogen and oxygen analyzer 6 to facilitate the staff to observe the purity of the finished gas.

[0050] The nitrogen and oxygen analyzer 6 realizes the detection of the purity of the gas (nitrogen or oxygen). If the detected purity meets the standard, the control circuit inside the nitrogen and oxygen analyzer 6 controls the third solenoid valve 41 to act and makes the third solenoid valve 41 communicate with the gas storage tank 5, so that the qualified finished gas enters the gas storage tank 5 and is transported to the user through the exhaust pipe 1 connected to the gas storage tank 5; if the detected purity does not meet the standard, the control circuit inside the nitrogen and oxygen analyzer 6 controls the third solenoid valve 41 to act and makes the third solenoid valve 41 communicate with the discharge pipe 4, so that the unqualified finished gas is directly discharged into the external air through the discharge pipe 4; the cooperation between the third solenoid valve 41 and the nitrogen and oxygen analyzer 6 ensures that the gas entering the gas storage tank 5 is all qualified finished gas, ensuring that the gas use quality of the user is not affected.

[0051] In some embodiments of the present application, the adsorption system 7 includes an adsorption tower A 71, an adsorption tower B 72 (an A tower pressure gauge 711 is provided on the adsorption tower A 71, and a B tower pressure gauge 721 is provided on the adsorption tower B 72 for real-time detection of the internal pressure value), and molecular sieves disposed inside the adsorption tower A 71 and the adsorption tower B 72. The molecular sieves are nitrogen molecular sieves or oxygen molecular sieves; an input end 76 and an output end 77 are respectively disposed at opposite ends of the adsorption tower A 71 and opposite ends of the adsorption tower B 72; a switching component is used to control the adsorption tower A 71 and the adsorption tower B 72 not to communicate with the second solenoid valve 73 at the same time (the switching component is connected to a program controller 104, and the program controller 104 controls the switching component to act at intervals according to the set time and realizes the control of the compressed gas to be transported to the adsorption tower A 71 or to the adsorption tower B 72), and the first solenoid valve 31 is also connected to the program controller 104, and the program controller 104 controls the first solenoid valve 31 to act at intervals according to the set time, so that the output end 77 of the adsorption tower A 71 communicates with the input port 34 of the buffer tank 3, or the output end 77 of the adsorption tower B 72 communicates with the input port 34 of the buffer tank 3.

[0052] During specific implementation: The program controller 104 controls the operation of the switch assembly, connects the second solenoid valve 73 to the input end 76 of the adsorption tower A 71, and controls the first solenoid valve 31 to connect the output end 77 of the adsorption tower A 71 to the input port 34 of the buffer tank 3 (at this time, the adsorption tower A 71 is in the adsorption working state). The purified compressed air enters the adsorption tower A 71 through the second solenoid valve 73 and the switch assembly and completes the separation of nitrogen and oxygen in the adsorption tower A 71 (completed by the molecular sieve). Nitrogen (oxygen) enters the buffer tank 3 from the output end 77 of the adsorption tower A 71 through the first solenoid valve 31 and the input port 34 of the buffer tank 3 in sequence; when the adsorption capacity of the molecular sieve in the adsorption tower A 71 reaches saturation, the program controller 104 controls the operation of the switch assembly, connects the input end 76 of the adsorption tower B 72 to the second solenoid valve 73, and at the same time controls the first solenoid valve 31 to operate, so that the output end 77 of the adsorption tower B 72 is connected to the input port 34 of the buffer tank 3; at this time, the switch assembly controls the input end 76 of the adsorption tower A 71 to communicate with the outside. During this process, the purified compressed air enters the adsorption tower B 72 and completes the separation process of nitrogen and oxygen in the adsorption tower B 72 (completed by the molecular sieve). Nitrogen (oxygen) enters the buffer tank 3 from the output end 77 of the adsorption tower B 72 through the first solenoid valve 31 and the input port 34 of the buffer tank 3 in sequence; at the same time, the oxygen (nitrogen) adsorbed by the molecular sieve in the adsorption tower A 71 is depressurized and desorbed, so that the oxygen (nitrogen) is discharged from the input end 76 of the adsorption tower A 71 to the outside, thereby realizing the regeneration process of the molecular sieve in the adsorption tower A 71; when the adsorption capacity of the molecular sieve in the adsorption tower B 72 reaches saturation, the program controller 104 controls the operation of the switch assembly, so that the second solenoid valve 73 is connected to the input end 76 of the adsorption tower A 71 again. At this time, the switch assembly makes the input end 76 of the adsorption tower A 71 no longer communicate with the outside, controls the first solenoid valve 31 to operate, so that the output end 77 of the adsorption tower A 71 is connected to the input port 34 of the buffer tank 3, and then continues to realize the separation process of nitrogen and oxygen through the adsorption tower A 71. At the same time, the molecular sieve in the adsorption tower B 72 is depressurized and desorbed (the process is the same as above and will not be described in detail here). Thus, through the coordinated cooperation among the program controller 104, the switch assembly, and the first solenoid valve 31, the purified compressed air enters the adsorption tower A 71 and the adsorption tower B 72 alternately at intervals, realizing the continuous preparation process of nitrogen (oxygen).

[0053] When oxygen needs to be prepared, the molecular sieves in both the adsorption tower A 71 and the adsorption tower B 72 are oxygen molecular sieves (such as zeolite molecular sieves). When nitrogen needs to be prepared, the molecular sieves in both the adsorption tower A 71 and the adsorption tower B 72 are nitrogen molecular sieves (such as carbon molecular sieves). By utilizing the characteristics that different molecular sieves have different adsorption capacities for nitrogen and oxygen, the separation of nitrogen and oxygen is realized.

[0054] A blowback pipe 32 is provided between the first solenoid valve 31 and the buffer tank 3 in this solution (a blowback interface 36 is provided on the buffer tank 3, and the blowback pipe 32 is connected to the buffer tank 3 through the blowback interface 36); when the gas enters the buffer tank 3 from the output end 77 of the adsorption tower A 71 through the input port 34 of the buffer tank 3, the program controller 104 controls the first solenoid valve 31 to act, and makes the blowback pipe 32 communicate with the adsorption tower B 72, so as to realize that the nitrogen (oxygen) in the buffer tank 3 enters the adsorption tower B 72 through the blowback pipe 32 and generates a certain air flow, thereby accelerating the discharge of the gas desorbed from the molecular sieve in the adsorption tower B 72 to the outside through the corresponding first valve port 741 and second valve port 742 at the input end 76 of the adsorption tower B 72; similarly, when the gas enters the buffer tank 3 from the output end 77 of the adsorption tower B 72 through the input port 34 of the buffer tank 3, the program controller 104 controls the first solenoid valve 31 to act, and makes the blowback pipe 32 communicate with the adsorption tower A 71, so as to realize that the nitrogen (oxygen) in the buffer tank 3 enters the adsorption tower A 71 through the blowback pipe 32 and generates a certain air flow, thereby accelerating the discharge of the gas desorbed from the molecular sieve in the adsorption tower A 71 to the outside through the corresponding first valve port 741 and second valve port 742 at the input end 76 of the adsorption tower A 71, so as to improve the desorption efficiency.

[0055] In some embodiments of the present application, the switch assembly includes a quick exhaust valve 74 connected to the input end 76 of the adsorption tower A 71 and the input end 76 of the adsorption tower B 72, and a fourth solenoid valve 75 connected to the second solenoid valve 73. The fourth solenoid valve 75 is connected to the program controller 104. The quick exhaust valve 74 has a first valve port 741 connected to the input end 76 of the adsorption tower A 71 or the input end 76 of the adsorption tower B 72, a second valve port 742 connected to the outside world, and a third valve port 743 connected to the fourth solenoid valve 75. A valve core is provided in the quick exhaust valve 74. When compressed air enters the third valve port 743 through the fourth solenoid valve 75, the valve core is pushed to move, so that the third valve port 743 is connected to the first valve port 741, thereby allowing compressed air to enter the corresponding adsorption tower A 71 or adsorption tower B 72 through the input end 76. When there is no compressed air input in the third valve port 743, the adsorption tower A The gas in tower 71 or adsorption tower B 72 forces the valve core to move in the opposite direction, so that the first valve port 741 is connected to the second valve port 742, and then the input end 76 of adsorption tower A 71 or adsorption tower B 72 is connected to the outside world (the quick exhaust valve 74 is a prior art, and its working principle is not described in detail here), that is, when compressed gas is input into the third valve port 743 through the fourth solenoid valve 75, the third valve port 743 is connected to the first valve port 741 and the compressed air enters the adsorption tower A 71 or adsorption tower B 72. When no compressed air is input into the third valve port 743, the first valve port 741 is connected to the second valve port 742, which is used to realize the pressure reduction and desorption process of adsorption tower A 71 or adsorption tower B 72; under the control of the program controller 104, the fourth solenoid valve 75 prevents the second solenoid valve 73 from being connected to the input end 76 of adsorption tower A 71 and adsorption tower B 72 at the same time.

[0056] In specific implementation, when the fourth solenoid valve 75 is connected to the input end 76 of the adsorption tower A 71, compressed air enters the adsorption tower A 71 through the corresponding third valve port 743 and the first valve port 741 at this time and completes the separation of nitrogen and oxygen in the adsorption tower A 71. When the molecular sieve adsorption capacity in the adsorption tower A 71 is saturated, the program controller 104 controls the fourth solenoid valve 75 to be connected to the input end 76 of the adsorption tower B 72, so that the purified compressed air enters the adsorption tower B 72 through the corresponding third valve port 743 and the first valve port 741 of the adsorption tower B 72 and completes the separation of nitrogen and oxygen in the adsorption tower B 72; at the same time, since the fourth solenoid valve 75 no longer conveys compressed air into the adsorption tower A 71, the first valve port 741 on the quick exhaust valve 74 corresponding to the adsorption tower A 71 is switched to be connected to the second valve port 742, so that the gas desorbed from the molecular sieve in the adsorption tower A 71 is discharged to the outside air through the input end 76, the first valve port 741, and the second valve port 742 of the adsorption tower A 71, so as to realize the regeneration process of the molecular sieve in the adsorption tower A 71. When the molecular sieve adsorption capacity in the adsorption tower B 72 is saturated, repeating the same process above can realize the continuous preparation process of nitrogen (oxygen).

[0057] In some embodiments of the present application, the first solenoid valve 31, the second solenoid valve 73, the third solenoid valve 41, and the fourth solenoid valve 75 are all two-position five-way solenoid valves. There is a sealed cavity inside them, and through holes are provided at different positions. Each hole leads to a different pipeline. The valve is in the middle of the cavity. The valve moves in the cavity to block or expose different holes to realize connection with different pipelines; in this embodiment, in combination with the structure of the two-position five-way solenoid valve, a connection method of the first solenoid valve 31 with the adsorption tower A 71, the adsorption tower B 72, the buffer tank 3, and the backflush pipe 32 is given as follows: The first solenoid valve (two-position five-way solenoid valve) has a first pipe orifice 311, a second pipe orifice 312, and a third pipe orifice 313 on the same side, and a fourth pipe orifice 314 and a fifth pipe orifice 315 on the opposite side. A valve 317 (the valve is driven by an electric control component) is movably arranged in the cavity 316, so that the output end 77 of the adsorption tower A 71 is connected to the fourth pipe orifice 314, the output end 77 of the adsorption tower B 72 is connected to the fifth pipe orifice 315, the backflush pipe 32 is respectively connected to the first pipe orifice 311 and the third pipe orifice 313, and the input port 34 of the buffer tank 3 is connected to the second pipe orifice 312; when the adsorption tower A 71 is in the working adsorption state, the gas movement path is as follows: as Figure 6As shown in the figure, the gas movement path in the adsorption tower A 71 at this time is as follows: successively passing through the fourth pipe orifice 314, the cavity 316, the second pipe orifice 312, and the input port 34 of the buffer tank 3, and finally entering the buffer tank 3; the gas movement path in the backflush pipe 32 is as follows: successively passing through the third pipe orifice 313, the cavity 316, the fifth pipe orifice 315, and the output end 77 of the adsorption tower B 72, and finally entering the adsorption tower B 72 (to achieve the backflush effect); when the adsorption tower B 72 is in the working adsorption state, the gas movement path is as follows: as Figure 7 shown in the figure, the gas movement path in the adsorption tower B 72 at this time is as follows: successively passing through the fifth pipe orifice 315, the cavity 316, the second pipe orifice 312, and the input port 34 of the buffer tank 3, and finally entering the buffer tank 3; the gas movement path in the backflush pipe 32 is as follows: successively passing through the first pipe orifice 311, the cavity 316, the fourth pipe orifice 314, and the output end 77 of the adsorption tower A 71, and finally entering the adsorption tower A 71 (to achieve the backflush effect); since the two-position five-way solenoid valve is a prior art and is a commonly used component in the art for controlling the switching of different fluid paths, the working principle process thereof will not be explained in detail herein.

[0058] In some embodiments of the present application, a check valve 52 and a flow meter 53 are sequentially connected between the gas storage tank 5 and the third solenoid valve 41. The check valve 52 is provided to prevent the qualified finished gas entering the gas storage tank 5 from flowing out in the reverse direction, and the flow meter 53 is provided to help the staff obtain the flow value of the qualified finished gas for mastering the demand of the finished gas in real time.

[0059] In some embodiments of the present application, the air filtration system includes a connected filtration component and a drying component. The filtration component includes a plurality of filters 8 (four in this solution) connected in sequence. The filtration precisions of the plurality of filters 8 are different, and different levels of filtration of compressed air are respectively achieved. The first three filters in this solution are used to remove impurities in the compressed air, and the last stage is an activated carbon oil removal filter, which is used to remove oil molecules, so as to achieve refined filtration of the compressed air. The drying component is a refrigerated dryer 9, which is used to remove the moisture in the compressed air. The refrigerated dryer 9 and the plurality of filters 8 are both connected to a drain pipe 2, and a drain port 21 is provided on the drain pipe 2. The dust, dirt filtered by the plurality of filters 8 and the water removed by the refrigerated dryer 9 all enter the drain pipe 2 and are discharged out through the drain port 21. The refrigerated dryer 9 is arranged between any two adjacent filters 8. Preferably, the refrigerated dryer 9 can be arranged between the two filters 8 in the first two stages. The large particle impurities in the air are first removed by one filter 8 in front of the refrigerated dryer 9, and the air enters the refrigerated dryer 9 after primary filtration, avoiding the large particle impurities in the air from affecting the normal operation of the refrigerated dryer 9, so as to ensure the working efficiency of the refrigerated dryer 9. After the refrigerated dryer 9 completes the removal of water in the compressed air, small particle impurities may be generated. The gas coming out of the refrigerated dryer 9 is further filtered through the plurality of filters 8 behind to achieve further filtration of the small particle impurities in the compressed air. In this embodiment, a refrigerant valve 92 is added to the refrigerant pipe of the refrigerated dryer 9 for installing a refrigerant pressure gauge 91 to observe the working state of the refrigerated dryer 9.

[0060] In some embodiments of the present application, regulating valves 33 are provided on the exhaust pipe 1 for regulating the gas flow rate.

[0061] In some embodiments of the present application, a heat dissipation hole 101 corresponding to the refrigerated dryer 9 is provided on the equipment box 10, and a heat dissipation fan 107 is provided at a position corresponding to the heat dissipation hole 101 to accelerate the discharge of the hot air in the equipment box 10 to the outside, so as to improve the heat dissipation effect.

[0062] This solution integrates all the above components in the equipment box 10. As Figures 6 - 7 shown, it is a schematic diagram of the internal structure of the equipment box of the present utility model. A heat dissipation hole 101 corresponding to the refrigerated dryer 9 is provided on the equipment box 10, and a heat dissipation fan 107 is provided inside the equipment box 10 at a position corresponding to the heat dissipation hole 101 to ensure that the heat generated during the operation of the refrigerated dryer 9 can be discharged to the outside in time, ensuring the normal operation of the refrigerated dryer 9. At the same time, a power interface 102 is provided on the equipment box 10 for connecting to an external power supply (for supplying power to the components inside the equipment box 10). A switch 103, a power indicator light 105, and a purity meter 106 (connected to the nitrogen and oxygen analyzer 6) are provided on the equipment box 10 to facilitate the operation of the staff or the observation of the purity of the finished gas.

[0063] The working process of the utility model is as follows: First, compressed air enters the air filtration system through the compressed air inlet 81 to complete purification. The purified compressed air alternately enters the adsorption tower A 71 and the adsorption tower B 72 at intervals to continuously prepare the finished gas. When the adsorption tower A 71 is working, the adsorption tower B 72 performs pressure reduction and desorption; when the adsorption tower B 72 is working, the adsorption tower A 71 performs pressure reduction and desorption, so as to realize the continuous and alternating work of the two at intervals; during the process of the finished gas entering the gas storage tank 5 from the buffer tank 3, the purity of the finished gas is detected by the nitrogen-oxygen analyzer 6. If it does not meet the standard, the finished gas is discharged outward through the discharge pipe 4. If it meets the standard, it enters the gas storage tank 5; at the same time, a pressure switch 51 is provided on the gas storage tank 5 to monitor the air pressure in the gas storage tank 5 in real time, and according to the pressure change in the gas storage tank 5, the start and stop of the adsorption system 7 are automatically controlled.

[0064] In summary, the utility model provides a small nitrogen-oxygen preparation integrated machine. In this solution, a pressure switch 51 is provided on the gas storage tank 5 to detect the pressure in the gas storage tank 5. The pressure switch 51 controls the action of the second solenoid valve 73 according to the detected pressure parameters to control whether the compressed air is transported to the adsorption system 7, so as to control the start and stop of the adsorption system 7, greatly improving the automation degree in the nitrogen-oxygen preparation process and reducing the labor burden of the staff; in this solution, all the components for preparing nitrogen and oxygen and the components for controlling the start and stop of the adsorption system are integrated in the equipment box 10, which not only effectively reduces the overall volume of the equipment, helps to miniaturize it, meets the needs of users who require small equipment, but also can control the start and stop of the adsorption system according to the change of the air pressure in the gas storage tank while meeting the miniaturization requirement, ensuring the safe operation of the nitrogen-oxygen preparation equipment; at the same time, in order to ensure the normal and stable operation of each component, heat dissipation holes 101 are provided on the equipment box 10 to timely discharge the heat in the equipment box 10 to the outside.

[0065] The above is only the preferred embodiment of the utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the utility model, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the utility model.

Claims

1. A small integrated nitrogen and oxygen preparation machine, characterized in that, Comprising: An air filtration system; An adsorption system having an input end and an output end. The input end of the adsorption system is connected to the air filtration system via a switch assembly. The switch assembly is used to control the connection between the input end of the adsorption system and the air filtration system or the outside. The adsorption system is used to adsorb nitrogen or oxygen in the air purified by the air filtration system. The output end of the adsorption system is connected to a gas storage tank, and the gas storage tank is connected to an exhaust pipe. A first solenoid valve is provided between the output end of the adsorption system and the gas storage tank; A second solenoid valve provided between the switch assembly and the air filtration system; A pressure switch provided on the gas storage tank. The pressure switch is used to detect the pressure in the gas storage tank and control the conduction or disconnection between the second solenoid valve and the switch assembly according to the pressure change; And An equipment box, in which the air filtration system, the adsorption system, and the gas storage tank are all accommodated.

2. The small nitrogen and oxygen preparation integrated machine according to claim 1, characterized in that, It further includes a third solenoid valve provided between the first solenoid valve and the gas storage tank. The third solenoid valve is connected to a discharge pipe; A sampling interface is provided between the first solenoid valve and the third solenoid valve, and the sampling interface is connected to a nitrogen and oxygen analyzer.

3. The integrated small-sized nitrogen and oxygen preparation machine according to claim 2, wherein, The adsorption system includes an adsorption tower A, an adsorption tower B, and molecular sieves provided in the adsorption tower A and the adsorption tower B. The molecular sieves are nitrogen molecular sieves or oxygen molecular sieves. The input end and the output end are respectively provided at opposite ends of the adsorption tower A and opposite ends of the adsorption tower B; The switch assembly is used to control that the input ends of the adsorption tower A and the adsorption tower B are not connected to the second solenoid valve at the same time. The output ends of the adsorption tower A and the adsorption tower B are both connected to the first solenoid valve. The first solenoid valve is used to control that the output ends of the adsorption tower A and the adsorption tower B are not connected to the third solenoid valve at the same time.

4. The small nitrogen and oxygen preparation integrated machine according to claim 3, characterized in that The switch assembly includes quick exhaust valves respectively connected to the input ends of the adsorption tower A and the adsorption tower B and a fourth solenoid valve connected to the second solenoid valve. The quick exhaust valve has a first valve port connected to the input end, a second valve port connected to the outside, and a third valve port connected to the fourth solenoid valve; The quick exhaust valve is used to control the connection between the corresponding input end and the outside or the fourth solenoid valve according to the pressure change. The fourth solenoid valve is used to control that the second solenoid valve is not connected to the input ends of the adsorption tower A and the adsorption tower B at the same time.

5. The small nitrogen and oxygen preparation integrated machine according to claim 4, wherein The third solenoid valve, the second solenoid valve, the first solenoid valve, and the fourth solenoid valve are all two-position five-way solenoid valves.

6. The integrated small-sized nitrogen and oxygen preparation machine according to claim 2, characterized in that, A one-way valve and a flow meter are sequentially connected between the gas storage tank and the third solenoid valve.

7. The integrated small-sized nitrogen and oxygen preparation machine according to claim 1, wherein The air filtration system includes a filtration component and a drying component connected in sequence. The filtration component includes a plurality of filters connected in sequence. The drying component is a cold dryer. The cold dryer is connected between any adjacent two filters.

8. The small nitrogen and oxygen preparation integrated machine according to claim 7, characterized in that, The cold dryer and the plurality of filters are all commonly connected to a blowdown pipe.

9. The small nitrogen and oxygen preparation integrated machine according to claim 1, characterized in that A regulating valve is provided on the exhaust pipe.

10. The small nitrogen and oxygen preparation integrated machine according to claim 1, wherein, The equipment box is provided with heat dissipation holes, and a heat dissipation fan is arranged inside the equipment box at a position corresponding to the heat dissipation holes.

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