Nitrogen generation system

Abstract

The utility model discloses a nitrogen making system, and particularly relates to the technical field of molecular sieve pressure swing adsorption nitrogen making, the nitrogen making system comprises a gas inlet module, a nitrogen making module and a nitrogen outlet module, the gas inlet module is connected with the nitrogen making module, the nitrogen making module is connected with the nitrogen outlet module, and a vacuumizing module is arranged between the gas inlet module and the nitrogen outlet module; the vacuumizing module comprises a vacuum generating device, a vacuum air inlet valve fixedly installed on the air storage tank and a vacuum air suction valve fixedly installed on a pipeline between the qualified discharge valve and the pressure transmitter. The vacuum air inlet valve and the vacuum air suction valve are fixedly connected with the vacuum generating device through pipelines. According to the utility model, by arranging the vacuumizing module, vacuumizing and a nitrogen making machine of the nitrogen making module are integrated together, so that finished products are saved, and operation links are reduced; the nitrogen purity requirement required by storage of most optical equipment containers is met; and convenience is provided for storage of high-precision optical equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of nitrogen production by molecular sieve pressure swing adsorption, and more specifically, to a nitrogen production system. Background Art

[0002] It is known that nitrogen generators currently on the market all produce nitrogen and then directly output the nitrogen to the optical equipment container for storage and use. The optical equipment connected to the nitrogen generator has a certain amount of air and water vapor in its own volume. If nitrogen is filled in, the humidity inside the container will be reduced, which will increase the internal pressure of the optical equipment. If the moisture inside the equipment is not discharged, long-term storage will cause condensation of water droplets inside the optical equipment, thereby failing to achieve the expected preservation effect. Therefore, the conventional approach to this problem in the prior art is to continuously fill nitrogen into the container to reduce the humidity in the container by replacing the internal air for a long time; or to add an additional vacuum equipment when the nitrogen generator is equipped for nitrogen filling, first vacuum the equipment that needs to be filled with nitrogen for protection, and then fill it with nitrogen again.

[0003] However, in actual use, the replacement process of the prior art takes a long time, is time-consuming and laborious; in particular, some high-precision optical equipment requires no moisture inside for storage, and directly filling with nitrogen cannot meet the storage conditions of high-precision optical instruments; and if a vacuum pumping device is added when storing such high-precision optical instruments, although it can achieve high-purity nitrogen filling in the equipment container, this solution is not only cumbersome to operate, but also involves a process of switching equipment in the middle, and the connecting pipes are prone to leakage, thereby allowing air to enter the equipment again, and a separate vacuum pumping device is configured, resulting in a large waste of energy. Therefore, a nitrogen production system is proposed as a further improvement. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the utility model provides a nitrogen production system to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the utility model provides the following technical solution: a nitrogen production system, comprising an air intake module, a nitrogen production module and a nitrogen outlet module, wherein the air intake module is connected to the nitrogen production module, the nitrogen production module is connected to the nitrogen outlet module, and a vacuum module is arranged between the air intake module and the nitrogen outlet module;

[0006] The air intake module comprises: an air storage tank;

[0007] The nitrogen production module comprises: a nitrogen storage tank;

[0008] The nitrogen outlet module includes: a qualified discharge valve, a pressure transmitter, a pressure regulating device and a flow regulating device;

[0009] The nitrogen gas storage tank is fixedly connected to the pressure regulating device through a pipeline, the pressure regulating device is also fixedly connected to the flow regulating device through a pipeline, the flow regulating device is also fixedly connected to the qualified discharge valve through a pipeline, and the qualified discharge valve is fixedly connected to the pressure transmitter through a pipeline;

[0010] The vacuum pumping module comprises: a vacuum generating device, a vacuum inlet valve and a vacuum suction valve;

[0011] The vacuum intake valve is fixedly installed on the air storage tank, and the vacuum suction valve is fixedly installed on the pipeline between the qualified discharge valve and the pressure transmitter. The vacuum intake valve and the vacuum suction valve are both fixedly connected to the vacuum generating device through pipelines.

[0012] Furthermore, the air intake module further comprises: a compressor and a condenser;

[0013] The compressor is fixedly connected to the condenser through a pipeline, and the condenser is fixedly connected to the air storage tank through a pipeline.

[0014] Furthermore, the nitrogen production module further comprises: a nitrogen production module and a nitrogen outlet valve;

[0015] The air storage tank is fixedly connected to a three-position five-way valve through a pipeline, the three-position five-way valve is fixedly connected to at least two nitrogen production modules through a pipeline, the nitrogen production module is fixedly connected to a nitrogen outlet valve through a pipeline, and the nitrogen outlet valve is fixedly connected to a nitrogen storage tank through a pipeline.

[0016] Furthermore, the nitrogen outlet module further comprises: an impure nitrogen discharge valve;

[0017] The flow regulating device is also fixedly connected to the impure nitrogen discharge valve through a pipeline, and the other end of the impure nitrogen discharge valve is connected to the external environment through a pipeline.

[0018] Furthermore, the pressure regulating device is also fixedly connected to a pipeline speed regulating valve through a pipeline, and a nitrogen purity sensor is fixedly installed on the other end of the pipeline speed regulating valve.

[0019] Furthermore, the pipe opening of the pressure transmitter communicating with the outside through a pipeline is set as a nitrogen outlet.

[0020] Technical effects and advantages of the utility model:

[0021] Compared with the prior art, by setting up a vacuum module, the vacuum generating device, the vacuum inlet valve and the vacuum suction valve are fully utilized, and the nitrogen generator of the vacuum and nitrogen making modules are integrated together, which saves finished products and reduces process control points; the negative pressure value of vacuuming and the pressure value and the number of repetitions required for filling with protective nitrogen can be customized, and the purity of nitrogen produced by itself can be ensured while ensuring the purity of nitrogen in the equipment required by customers. The working mode can be freely selected: vacuuming and then filling with nitrogen or directly filling with nitrogen without vacuuming; and the nitrogen outlet adopts a universal connector, which can be directly connected to the optical container; equipped with a display module, it is easy to operate; the nitrogen purity sensor is used to check whether the nitrogen discharged from the nitrogen storage tank to the optical container has reached the required purity; therefore, the nitrogen making system can meet the nitrogen purity requirements required for the storage of most optical equipment containers; it provides convenience for solving the storage of high-precision optical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0023] The accompanying drawings are marked as follows:

[0024] 1. Air intake module; 11. Air storage tank; 12. Compressor; 13. Condenser;

[0025] 2. Nitrogen production module;

[0026] 21. Nitrogen gas storage tank; 22. Nitrogen production module; 23. Nitrogen outlet valve; 24. Three-position five-way valve;

[0027] 3. Nitrogen outlet module;

[0028] 31. Qualified discharge valve; 32. Pressure transmitter; 33. Pressure regulating device; 34. Flow regulating device; 35. Impure nitrogen discharge valve; 36. Pipeline speed regulating valve; 37. Nitrogen purity sensor;

[0029] 38. Nitrogen outlet;

[0030] 4. Vacuum module;

[0031] 41. Vacuum generating device; 42. Vacuum air inlet valve; 43. Vacuum air suction valve;

[0032] 44. Vacuum air inlet duct; 45. Vacuum air suction duct. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0034] As attached Figure 1 A nitrogen production system shown includes an air intake module 1, a nitrogen production module 2 and a nitrogen outlet module 3, wherein the air intake module 1 is connected to the nitrogen production module 2, the nitrogen production module 2 is connected to the nitrogen outlet module 3, and a vacuum module 4 is provided between the air intake module 1 and the nitrogen outlet module 3;

[0035] The air intake module 1 includes: an air storage tank 11, a compressor 12 and a condenser 13;

[0036] The compressor 12 is fixedly connected to the condenser 13 through a pipeline, and the condenser 13 is fixedly connected to the air storage tank 11 through a pipeline;

[0037] The nitrogen production module 2 comprises: a nitrogen storage tank 21, a nitrogen production module 22 and a nitrogen outlet valve 23;

[0038] The air storage tank 11 is fixedly connected to a three-position five-way valve 24 through a pipeline, the three-position five-way valve 24 is fixedly connected to at least two nitrogen production modules 22 through pipelines, the nitrogen production modules 22 are fixedly connected to a nitrogen outlet valve 23 through a pipeline, and the nitrogen outlet valve 23 is fixedly connected to the nitrogen storage tank 21 through a pipeline;

[0039] The nitrogen outlet module 3 includes: a qualified discharge valve 31, a pressure transmitter 32, a pressure regulating device 33, a flow regulating device 34 and an impure nitrogen discharge valve 35;

[0040] The nitrogen gas storage tank 21 is fixedly connected to the pressure regulating device 33 through a pipeline, the pressure regulating device 33 is also fixedly connected to the flow regulating device 34 through a pipeline, the flow regulating device 34 is also fixedly connected to the qualified discharge valve 31 through a pipeline, and the qualified discharge valve 31 is fixedly connected to the pressure transmitter 32 through a pipeline; the flow regulating device 34 is also fixedly connected to the impure nitrogen discharge valve 35 through a pipeline, and the other end of the impure nitrogen discharge valve 35 is connected to the external environment through a pipeline;

[0041] Among them, when the input power supply of the conventional nitrogen production system is normal, the controller is powered on, the whole machine self-checks, and controls the compressor 12, the fan, various solenoid valves and corresponding sensors to operate periodically according to the set program; at this time, the ambient air enters the compressor 12 after filtering out dust and other impurities through the filter, and becomes high-temperature air with a certain pressure after being pressurized by the compressor 12. The pressurized high-temperature gas enters the condenser 13 for cooling and then enters the air storage tank 11. The air in the air storage tank 11 enters the nitrogen production module 22 under the control of the control board, and is adsorbed and desorbed by the nitrogen production module 22. The nitrogen enters the nitrogen storage tank 21 through the nitrogen outlet valve 23, that is, the one-way valve, and the analyzed oxygen is discharged outside the system. The nitrogen in the nitrogen storage tank 21 is output for use in the optical container after being reduced pressure by the pressure regulating device 33 and limited by the flow regulating device 34.

[0042] In a preferred embodiment, as shown in the attached Figure 1 As shown, the pressure regulating device 33 is also fixedly connected to a pipeline speed regulating valve 36 through a pipeline, and a nitrogen purity sensor 37 is fixedly installed at the other end of the pipeline speed regulating valve 36, so that the nitrogen purity sensor 37 can be used to check whether the nitrogen discharged from the nitrogen storage tank 21 to the optical container reaches the required purity.

[0043] The vacuum module 4 includes: a vacuum generating device 41, a vacuum inlet valve 42 and a vacuum suction valve 43;

[0044] The vacuum inlet valve 42 is fixedly installed on the air storage tank 11, and the vacuum suction valve 43 is fixedly installed on the pipeline between the qualified discharge valve 31 and the pressure transmitter 32. The vacuum inlet valve 42 and the vacuum suction valve 43 are both fixedly connected to the vacuum generating device 41 through the pipeline; the pipe opening of the pressure transmitter 32 connected to the outside through the pipeline is set as the nitrogen outlet 38;

[0045] The pipeline that is fixedly connected between the vacuum inlet valve 42 and the vacuum generating device 41 is set as a vacuum inlet pipeline 44; the pipeline that is fixedly connected between the vacuum suction valve 43 and the vacuum generating device 41 is set as a vacuum suction pipeline 45;

[0046] The vacuum inlet valve 42 is used to prevent the gas in the air storage tank 11 from flowing to the vacuum generating device 41 when the vacuum pumping operation is not required, so that the internal pressure of the air storage tank 11 cannot be normally established, affecting the normal nitrogen production process; the vacuum suction valve 43 is used to prevent the nitrogen from flowing away from the vacuum generating device 41 when the nitrogen outlet 38 is normally connected to the optical container and is normally filled with nitrogen, so that the internal nitrogen pressure of the optical container cannot be established, affecting the normal filling of the optical container;

[0047] Among them, in addition to being normally connected to the three-position five-way valve 24 for the normal operation of the nitrogen making module 22 of the nitrogen making module 2, the air storage tank 11 is also connected to a vacuum intake valve 42, the vacuum intake valve 42 is connected to a vacuum generating device 41 through a vacuum intake pipe 44, the vacuum generating device 41 is then connected to a vacuum suction valve 43 through a vacuum suction pipe 45, and the vacuum suction valve 43 is connected to a pipe between the qualified discharge valve 31 and the pressure transmitter 32;

[0048] The vacuum inlet valve 42 and the vacuum suction valve 43 are both connected to the control board through a circuit; and the vacuum inlet valve 42 and the vacuum suction valve 43 are preferably normally closed solenoid valves, which are controlled by the control board;

[0049] A pressure transmitter 32 with negative pressure is provided at the nitrogen outlet 38 of the nitrogen as a sensor for real-time detection of pressure changes at the nitrogen outlet 38. When the nitrogen outlet 38 reaches the set vacuum value, it switches to the gas outlet mode, that is, it stops gas outlet after detecting that the nitrogen outlet 38 connected to the optical container reaches the required pressure. This process is controlled by the existing automatic program. A display module can be provided on the existing equipment, and the customer can independently set the vacuum negative pressure value of the nitrogen outlet 38 of the equipment and the positive pressure value required for inflation. The process of vacuuming and then inflating can be repeated many times. When facing some larger equipment or optical containers with high requirements for nitrogen purity, the number of cycles of vacuuming and then filling with nitrogen is appropriately increased. Multiple cycles ensure that all the air inside the container is evacuated and the nitrogen filled is not diluted, so as to achieve better protection effect. For some containers that do not need to be vacuumed and then inflated, it is only necessary to set the number of vacuuming to 0 on the display module to achieve inflation without vacuuming. At this time, the vacuum inlet valve 42, the vacuum suction valve 43 and the vacuum generating device 41 will no longer work.

[0050] Example:

[0051] Through the normal operation of the air intake module 1, the nitrogen production module 2 and the nitrogen output module 3, the high-purity nitrogen separated by the nitrogen production module 22 is stored in the nitrogen storage tank 21;

[0052] By adding a vacuum generating device 41 between the air storage tank 11 and the nitrogen outlet 38, during normal nitrogen production operation, the pressure in the air storage tank 11 is between 0.7 and 0.8 MPa. When a vacuum operation is required, the vacuum inlet valve 42 and the vacuum suction valve 43 at both ends of the vacuum generating device 41 are opened at the same time, and the high-pressure gas in the air storage tank 11 is ejected from the vacuum generating device 41 at a high speed, so that the air around the nozzle outlet is continuously sucked away, so that the pressure in the adsorption chamber drops below the atmospheric pressure, forming a certain vacuum degree. Under the influence of the vacuum degree, air is sucked in from the nitrogen outlet 38 to achieve the vacuum effect.

[0053] When the nitrogen outlet 38 is directly connected to the optical container, the nitrogen purity sensor 37 can automatically evacuate the connected equipment container and then fill it with high-purity nitrogen after the nitrogen reaches the required purity. The number of cycles is set according to the size of the container and the required humidity. The default number of automatic vacuuming and nitrogen filling cycles is 20. Therefore, the nitrogen production system can meet the nitrogen purity requirements for storing most optical equipment containers, providing convenience for the preservation of high-precision optical equipment.

[0054] Working principle of the utility model: when the nitrogen making system fills the optical container with nitrogen, it is necessary to connect the nitrogen outlet 38 to the optical container, maintain normal input power supply, set the vacuum value and the pressure value required for filling with nitrogen, start the nitrogen making system, and then when the nitrogen purity in the nitrogen storage tank 21 reaches the set value, the optical instrument can be evacuated, and the nitrogen filling operation can be performed when the vacuum value we set is reached; through the steps of evacuating and then filling, the purity of the nitrogen after filling is ensured, which plays a better protective role;

[0055] At this time, the vacuum operation is performed: the vacuum inlet valve 42 and the vacuum suction valve 43 are opened at the same time, and the high-pressure gas in the air storage tank 11 flows rapidly to the vacuum generating device 41 through the vacuum inlet valve 42 and then through the vacuum inlet pipe 44, and the high-pressure gas is discharged into the atmosphere through the vacuum generating device 41, and then a jet is formed at the nozzle outlet by using high-speed injection of compressed air. Under the effect of entrainment, the pressure in the adsorption chamber of the vacuum generating device 41 drops below the atmospheric pressure to form a vacuum degree. Under the influence of the vacuum degree, the vacuum generating device 41 will absorb air through the vacuum suction pipe 45. Since the vacuum suction valve 43 connected to the vacuum suction pipe 45 is in the open state, the air will be sucked in along the nitrogen outlet 38. With the opening of the vacuum inlet valve 42 and the vacuum suction valve 43, under the action of the vacuum generating device 41, the gas at the nitrogen outlet 38 is not only sucked in, but also, if the nitrogen outlet 38 is connected to a sealed optical container, with the suction of the gas at the nitrogen outlet 38, the gas inside the optical container is gradually evacuated to form a vacuum state.

[0056] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A nitrogen production system, comprising an air intake module (1), a nitrogen production module (2) and a nitrogen outlet module (3), wherein the air intake module (1) is connected to the nitrogen production module (2), and the nitrogen production module (2) is connected to the nitrogen outlet module (3), characterized in that: A vacuum module (4) is provided between the air intake module (1) and the nitrogen outlet module (3); The air intake module (1) comprises: an air storage tank (11); The nitrogen production module (2) comprises: a nitrogen storage tank (21); The nitrogen outlet module (3) comprises: a qualified discharge valve (31), a pressure transmitter (32), a pressure regulating device (33) and a flow regulating device (34); The nitrogen gas storage tank (21) is fixedly connected to a pressure regulating device (33) via a pipeline, the pressure regulating device (33) is also fixedly connected to a flow regulating device (34) via a pipeline, the flow regulating device (34) is also fixedly connected to a qualified discharge valve (31) via a pipeline, and the qualified discharge valve (31) is fixedly connected to a pressure transmitter (32) via a pipeline; The vacuum pumping module (4) comprises: a vacuum generating device (41), a vacuum air inlet valve (42) and a vacuum air suction valve (43); The vacuum intake valve (42) is fixedly mounted on the air storage tank (11), and the vacuum suction valve (43) is fixedly mounted on a pipeline between the qualified discharge valve (31) and the pressure transmitter (32). The vacuum intake valve (42) and the vacuum suction valve (43) are both fixedly connected to the vacuum generating device (41) via a pipeline.

2. A nitrogen production system according to claim 1, characterized in that: The air intake module (1) further comprises: a compressor (12) and a condenser (13); The compressor (12) is fixedly connected to the condenser (13) via a pipeline, and the condenser (13) is fixedly connected to the air storage tank (11) via a pipeline.

3. A nitrogen production system according to claim 1, characterized in that: The nitrogen production module (2) further comprises: a nitrogen production module (22) and a nitrogen outlet valve (23); The air storage tank (11) is fixedly connected to a three-position five-way valve (24) via a pipeline; the three-position five-way valve (24) is fixedly connected to at least two nitrogen production modules (22) via a pipeline; the nitrogen production module (22) is fixedly connected to a nitrogen outlet valve (23) via a pipeline; and the nitrogen outlet valve (23) is fixedly connected to the nitrogen storage tank (21) via a pipeline.

4. A nitrogen production system according to claim 1, characterized in that: The nitrogen outlet module (3) further comprises: an impure nitrogen discharge valve (35); The flow regulating device (34) is also fixedly connected to the impure nitrogen discharge valve (35) via a pipeline, and the other end of the impure nitrogen discharge valve (35) is connected to the external environment via a pipeline.

5. A nitrogen production system according to claim 1, characterized in that: The pressure regulating device (33) is also fixedly connected to a pipeline speed regulating valve (36) via a pipeline, and a nitrogen purity sensor (37) is fixedly mounted on the other end of the pipeline speed regulating valve (36).

6. A nitrogen production system according to claim 1, characterized in that: The pipe opening of the pressure transmitter (32) communicating with the outside through a pipeline is configured as a nitrogen outlet (38).

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