CN211076855U - Self-control nitrogen storage cabinet that fills nitrogen - Google Patents

Abstract

The utility model relates to a nitrogen making equipment technical field, specifically speaking relates to a cabinet is stored to self-control nitrogen filling. The wardrobe comprises a wardrobe body, wherein a partition plate is arranged at the lower part of the wardrobe body; an equipment placing cavity is arranged above the partition plate, and a left cabinet door and a right cabinet door are mounted on the front side of the equipment placing cavity; a plurality of dehumidification boxes are arranged on the back plate of the equipment placing cavity; and a control system and a nitrogen production system are arranged in the cavity below the partition plate. Storage cabinet is from taking nitrogen generator, the user only needs to provide the power can produce the nitrogen gas of high purity, low dew point, high cleanliness factor for the air of the internal portion of replacement cabinet makes the internal portion of cabinet form low oxygen content, low humidity's storage environment, simultaneously, storage cabinet humidity requirement sets up storage environment humidity in the cabinet when depositing according to the part, and forms undulant little, the degree of consistency is good, the little high stability storage environment of deviation.

Description

Self-control nitrogen storage cabinet that fills nitrogen

Technical Field

The utility model relates to a nitrogen making equipment technical field, specifically speaking relates to a cabinet is stored to self-control nitrogen filling.

Background

With the continuous progress of science and technology, the use of precise instruments, special materials and the like is gradually increased in various industries, and the precise instruments, special materials and the like have strict requirements on indexes such as temperature, humidity, oxygen content, electric field, magnetic field intensity and the like of a storage environment during storage, if the conditions are not proper, the precise instruments, special materials and the like can be affected by dampness, corrosion, mildew and fouling, the quality and the tactical performance of the precise instruments and instruments are influenced, and if the conditions are improper, the precise instruments, special materials and the like can be failed.

In the prior art, the technical schemes of nitrogen production, dehumidification and nitrogen storage are summarized and described as follows:

one, nitrogen making mode

At present, three methods, namely a cryogenic method, a pressure swing adsorption method and a membrane separation method, are commonly used in the air separation nitrogen production technology, are technically mature, and each method realizes industrialization and has a certain length.

1. Cryogenic process

The cryogenic process for producing nitrogen is based on the difference of volatility of each component in liquid air, and nitrogen is produced by separating nitrogen from other components through rectification. Because the liquefaction of the air needs to be carried out at low temperature, the temperature range belongs to a cryogenic section, and therefore the cryogenic air separation is called to produce nitrogen.

2. Pressure swing adsorption process

The pressure swing adsorption method for separating air to prepare nitrogen utilizes the difference of oxygen and nitrogen in adsorption capacity, adsorption rate, adsorption force and other aspects on a solid adsorbent and the selective adsorption characteristic of the adsorbent amount to the adsorption capacity of oxygen and nitrogen which are different along with the pressure to realize the oxygen-nitrogen separation.

3. Membrane separation process

The principle of membrane separation of nitrogen is as follows: when a mixture of two or more gases passes through a polymeric membrane, the relative permeation rates of the different gases in the membrane are also different due to differences in the solubility and diffusion coefficients of the various gases in the membrane. According to this characteristic, various gases can be classified into "fast gas" and "slow gas". When the mixed gas is under the action of pressure difference on two sides of the membrane, the gas with relatively high permeation rate, such as water, oxygen, etc., rapidly permeates through the wall of the hollow fiber membrane and is discharged, and the gas with relatively low permeation rate, such as nitrogen, argon, etc., is retained in the hollow fiber and is enriched, so that nitrogen with relatively high purity is obtained.

Second, dehumidification mode

At present, five methods of non-direct-delivery type rapid dehumidification, traditional electronic type dehumidification, direct-delivery type air inflation dehumidification, vacuum storage and electronic chip type are commonly used in dehumidification technology, the technology is mature, and each method realizes industrialization and has great advantages.

1. Non-direct-feeding type quick dehumidification device

Utilize gaseous ultrafiltration infiltration technique, evenly send into cabinet body inside with compressed air degree of depth dehydration back, quick dehumidification is realized to quick discharge moisture, guarantees the absolute safety of device. The non-direct-feeding compressed air rapid dehumidification method obtains a cheap, rapid and efficient dehumidification engine, has rapid dehumidification speed and low use cost, and is particularly suitable for occasions needing frequently opening/closing the cabinet door to take articles.

2. Traditional electronic dehumidification

The traditional electronic dehumidification is also called physical dehumidification. The principle is that 'zeolite' or 'molecular sieve' is used as a main moisture absorption body and is matched with a memory metal or a humidity sensor to perform dehumidification, and the method is a basic dehumidification principle of the full-automatic electronic low-humidity cabinet. Due to the saturation of the hygroscopic material, the domestic and foreign brands currently available on the market all require a regeneration cycle to "activate" its hygroscopic function. Generally, the period of 3-5 hours is a moisture absorption period, the period of 1 hour is a regeneration period, and the operation is repeated.

3. Direct-feeding type inflatable dehumidifying device

The direct-feeding type air-filled dehumidifying low-humidity cabinet utilizes the characteristic of low humidity of compressed air to simply remove oil and water from the compressed air, and then the compressed air is filled into the low-humidity cabinet. However, due to the characteristics of residual oil and water in the compressed air, unstable low humidity and the like, the direct-feeding dehumidification has great storage risk and even has humidification in practical use cases.

4. Vacuum preservation and dehumidification

The aim of removing moisture is achieved by vacuumizing the drying cabinet, and the drying cabinet is composed of a box body and a vacuum pump. The water content of the internal air is low due to the vacuum in the tank.

5. Electronic chip type dehumidification

The electronic chip type dehumidification mode is a new working principle and can be called as a 'freezing chip frosting, water-melting and dehumidification' mode, the technology is from a refrigeration chip in a refrigerator for a vehicle at first, the effect of temperature difference is utilized by the semiconductor characteristic, the temperature of one surface in the chip is lower, the other surface has a heating function, condensed water vapor is generated by the lower surface of the temperature and air in the refrigerator, natural gravity phenomenon that water drops are formed by small water drops is dripped to a water guide hole to be drained by water absorption fibers or sponge, and the water vapor is drained by the heated surface.

Third, nitrogen gas storage mode

Currently, the storage methods used in the market are roughly classified into three types: the vacuum pumping mode is adopted for storage, the moisture-proof box is adopted for storage, and the nitrogen cabinet is adopted for storage.

1. Storage by vacuum pumping

The vacuumized package can not completely remove moisture in the air, so that the moisture is attached to the surfaces of equipment such as precision instruments and meters, water mist is often generated on the mirror surfaces of precision photoelectric instruments such as night-vision devices and sighting scopes, and visual errors or reduced sensitivity and the like can be caused due to the water mist during use. Furthermore, since the packaging material used for vacuum packaging has a certain degree of permeability, moisture and oxygen permeate through the packaging material to corrode the packaged goods, resulting in the occurrence of mildew, oxidation, discoloration, and the like.

2. Moisture-proof box storage

The moisture-proof boxes on the market are roughly divided into two types: one is a rotational molding box, and the other is a storage box body provided with a dehumidification box. The rotational molding box only has a sealing function, and can isolate the air circulation inside and outside the box body, but can not remove the moisture in the air inside the box body; the storage box body provided with the dehumidification box can dry the air inside the box body, and has the defects that the dehumidification time is long, the oxygen content inside the box body cannot be reduced, and a storage environment higher than the current environment humidity cannot be created.

3. Nitrogen cabinet storage

The existing nitrogen gas cabinet on the market is divided into a storage and transportation box body and a nitrogen making module, and the nitrogen making module needs a gas source provided by a customer and is inconvenient for the customer to use.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a self-control nitrogen storage cabinet that fills nitrogen to solve foretell technical problem.

In order to solve the above problems, the utility model adopts the following technical scheme:

the utility model provides a cabinet is stored to self-control nitrogen filling, includes the cabinet body, its characterized in that: a partition plate is arranged at the lower part of the cabinet body; an equipment placing cavity is arranged above the partition plate, and a left cabinet door and a right cabinet door are mounted on the front side of the equipment placing cavity; a plurality of dehumidification boxes are arranged on the back plate of the equipment placing cavity; and a control system and a nitrogen production system are arranged in the cavity below the partition plate.

Furthermore, the dehumidification box comprises a box body, a middle cavity and side cavities positioned at two sides of the middle cavity are arranged in the box body, the middle cavity is communicated with the side cavities, and the side cavities are respectively communicated with the inside and the outside of the cabinet body through grid plates; the side cavities are internally provided with turning plates respectively, and the middle cavity is internally provided with a plurality of molecular sieve drying boxes and turning plate control mechanisms; the middle part of the turning plate is hinged on the framework of the box body; the turning plate control mechanism comprises an electric heater provided with a heating pipe, a memory alloy spring penetrating through the heating pipe and tension springs, wherein two ends of the memory alloy spring are respectively connected with first torsion springs, and the two first torsion springs are respectively connected with the upper parts of the two turning plates; two ends of the tension spring are respectively connected with second torsion springs, and the two second torsion springs are respectively connected with the lower parts of the two turning plates; the box body is provided with a power socket, and the electric heater is electrically connected with the power socket.

Still further, the nitrogen making system comprises an air source device, an air treatment device and an adsorption nitrogen making device; the air source device mainly comprises an air compressor; the air treatment device mainly comprises a condenser, a heat radiation fan, a filter and an air process tank; the adsorption nitrogen making device mainly comprises a first adsorption tower, a second adsorption tower, an electromagnetic valve group and a nitrogen process tank.

Still further, the control system mainly comprises intelligence P L C control center, touch-sensitive screen and a plurality of sensor.

Still further, the touch-sensitive screen is installed on left cabinet door, installs start button, stop button, power indicator and operation pilot lamp in the below of touch-sensitive screen.

Still further, two universal caster wheels and two directional caster wheels are installed at the bottom of the bottom plate of the cabinet body, and supporting legs with adjustable height structures are installed on the inner sides of the caster wheels respectively.

Furthermore, a plurality of layers of laminates for placing the equipment are arranged in the equipment placing cavity; and a glass plate is embedded on the right cabinet door.

Has the advantages that: compared with the prior art, storage cabinet is from taking nitrogen generator, and the user only needs to provide the power can produce the nitrogen gas of high purity, low dew point, high cleanliness for the air of the internal portion of replacement cabinet makes the internal portion of cabinet form low oxygen content, low humidity's storage environment, simultaneously, storage cabinet can set up the interior storage environment humidity of cabinet according to the humidity requirement when the part is deposited, and forms undulant little, the degree of consistency is good, the little high stability storage environment of deviation.

Drawings

Fig. 1 is a schematic front view of an embodiment of the present invention;

FIG. 2 is a left side view of FIG. 1;

FIG. 3 is a rear view of FIG. 1;

FIG. 4 is a schematic structural view of the nitrogen generation system of the present invention;

FIG. 5 is a schematic view of the inner structure of the dehumidifying box according to the present invention;

FIG. 6 is a view A-A of FIG. 5;

fig. 7 is a schematic view of an operation principle of an embodiment of the present invention.

In the figure: 1-a cabinet body; 11-a separator; 12-support legs; 13-universal castor; 14-a base plate; 15-directional casters; 16-power connection socket; 21-left cabinet door; 22-right cabinet door; 23-panel lock; 24-a glass plate; 25-layer plate; 31-stop button; 32-start button; 33-power indicator light; 34-running indicator light; 35-a touch screen; 4-a dehumidification box; 41-box body; 42-a first torsion spring; 43-a second torsion spring; 44-heating tube; 45-an electric heater; 46-a memory alloy spring; 47-a flap; 48-screws; 49-molecular sieve drying box; 410-tension spring; 411-an electrical outlet; 412-grid plate; 413-side cavity; 414-intermediate chamber; 51-nitrogen storage tank; 52-air reservoir; no. 53-first adsorption column; 54-adsorption column II; 55-an air compressor; 56-a heat dissipation fan; 57-a condenser; 6-electric installation board.

Detailed Description

The invention will be further explained with reference to the drawings and the specific embodiments.

Example (b):

referring to fig. 1-3, the self-made nitrogen storage cabinet that fills nitrogen described in this embodiment includes cabinet body 1, cabinet body 1 adopts 1.5mm and 1.2mm high-quality stainless steel plate preparation, many reinforcing structure, and bearing performance is good, and the eclipsed form structural design, sealing performance is splendid. Two universal caster 13 and two directional truckles 15 are installed to the bottom plate 14 bottom of the cabinet body 1, conveniently remove and fixed, and the supporting leg 12 that highly can construct the regulation is installed respectively to the inboard of every truckle, can improve holistic stability through supporting leg 12 atress when placing for a long time fixed point if equipment.

The lower part of the cabinet body 1 is equipped with baffle 11, the cavity is placed for the equipment to the top of baffle 11, the equipment is placed the intracavity and is provided with 3 layers of plywood 25 that are used for placing the equipment, and the height between each layer height between each plywood 25 can be adjusted according to the height of different parts, L ED lamp can also be installed to the intracavity is placed to the equipment, adopts proximity switch, and when opening the cabinet door, L ED lamp is opened, and convenient clear observation equipment is placed the intracavity part.

The front side in chamber is placed to the equipment installs left cabinet door 21 and right cabinet door 22, left side cabinet door 21 and right cabinet door 22 adopt to the door-opening type structure to through panel lock 23 locking, the biggest convenience of having guaranteed the equipment access. The two door panels are different in size, the left cabinet door 21 is small, the right cabinet door 22 is large, and the touch screen 35, the start button 32, the stop button 31, the power indicator lamp 33 and the operation indicator lamp 34 are fixedly mounted on the left cabinet door 21 and used for controlling the start and stop of the operation of the whole system.

The glass plate 24 is embedded in the right cabinet door 22, the glass plate 24 is made of high-strength toughened glass, the basic situation inside the cabinet body can be observed, and the times of opening and closing the cabinet door during patrol can be reduced.

4 dehumidification boxes 4 are installed on the backplate in the equipment placing cavity.

As shown in fig. 5 to 6, the dehumidifying box 4 includes a box body 41, and the box body 41 is made of a high-temperature resistant and flame-retardant material (e.g., nitrile resin). A middle cavity 414 and side cavities 413 positioned at two sides of the middle cavity 414 are arranged in the box body 41, the middle cavity 414 is communicated with the side cavities 413, and the side cavities 413 are respectively communicated with the inside and the outside of the cabinet body 1 through grid plates 412; the side cavity 413 is internally provided with a turning plate 47, and the middle cavity 414 is internally provided with a plurality of molecular sieve drying boxes 49 and a turning plate control mechanism. The molecular sieve drying box 49 is filled with environment-friendly polymer moisture absorption materials (such as polymer water absorption resin), can be activated and continuously used in a circulating way, does not release toxic and harmful gases in the operation of equipment, and can avoid potential safety hazards.

The middle part of the turning plate 47 is hinged on the framework of the box body 41; the flap control mechanism comprises an electric heater 45 provided with a heating pipe 44, a memory alloy spring 46 penetrating through the heating pipe 44 and a tension spring 410, wherein two ends of the memory alloy spring 46 are respectively connected with a first torsion spring 42, and the two first torsion springs 42 are respectively connected with the upper parts of two flaps 47; two ends of the tension spring 410 are respectively connected with a second torsion spring 43, and the two second torsion springs 43 are respectively connected with the lower parts of the two turning plates 47; the box body 41 is provided with a power socket 411, and the electric heater 45 is electrically connected with the power socket 411.

When the dehumidification box 4 absorbs moisture in the box, the electric heater 45 does not heat, the turning plates 47 on the two sides isolate the middle cavity 414 from the outside of the cabinet body 1, and the molecular sieve drying box 49 absorbs moisture in the equipment placing cavity. After the macromolecule hygroscopic material in the molecular sieve drying box 49 is saturated, the electric heater 45 is heated, the memory alloy spring 46 contracts to pull the turning plates 47 at the two sides, so that the turning plates 47 at the two sides rotate, the middle cavity 414 is isolated from the equipment placing cavity, at the moment, the moisture in the macromolecule hygroscopic material in the molecular sieve drying box 49 is discharged under the heating action of the electric heater 45, after the set time is up, the electric heater 45 stops heating, the turning plates at the two sides reset, and the middle cavity 414 is isolated from the outside of the cabinet body 1.

When the humidity in the equipment placing cavity does not reach the set humidity, the turning plate 47 controls the middle cavity 414 to be communicated with the external environment, so as to absorb the moisture in the air, and then the moisture is discharged into the equipment placing cavity. The dehumidification box 4 only needs to be heated when dehumidifying in the operation process, has low power consumption and stable operation, only needs to set the required control humidity, can automatically operate and does not drip after long-term operation.

And a control system and a nitrogen production system are arranged in a cavity below the partition plate 11.

As shown in fig. 4 and 7, the nitrogen production system comprises an air source device, an air treatment device and an adsorption nitrogen production device.

The air source device mainly comprises an air compressor 55, a shock absorber, an air filter and an air outlet interface component. Air compressor 55 adopts the oil-free silence air compressor, and this air compressor belongs to miniature reciprocating piston compressor, and when motor unipolar drive compressor crankshaft rotated, through the transmission of connecting rod, the piston that has the self-lubricating and do not add any emollient just reciprocating motion, and the working volume that constitutes by cylinder inner wall, cylinder head and piston top surface then can take place periodic variation. The air compressor 55 itself is made of a material which does not contain oily substances, and no lubricating oil is added during operation, so that the quality of the discharged air is greatly improved. The air compressor 55 serves as a power source for air in the equipment, compresses air to meet the requirements of output pressure and air quantity, has high structural integration level, and can reduce the volume of the equipment.

The air treatment device mainly comprises a condenser 57, a heat radiation fan 56, a filter and an air process tank. The condenser 57 is designed according to the actual condition of the equipment and is formed by welding radiating pipes, the radiating pipes are made of copper tubes with good radiating performance, compressed air is cooled through the copper tubes, most of water mist and oil mist enter the filter group after being condensed, and liquid water in the air is removed; and the filtered compressed air enters an air process tank for buffering. The condenser 57 dissipates heat in the pipe to the air near the radiating pipe rapidly, and in order to improve the efficiency of the condenser 57, the heat is taken away by accelerating the air convection by the radiating fan 56.

The air process tank consists of an air storage tank 52 and its attached valves and instruments. The air process tank can reduce the airflow pulsation of compressed air, and has the functions of stabilizing pressure, buffering and stabilizing flow, thereby reducing the influence of pressure fluctuation on the product gas purity of the system. Simultaneously, also when carrying out the adsorption tower work for the nitrogen making system and switching over, provide the required a large amount of compressed air that steps up rapidly in the short time, not only make the pressure in the adsorption tower can rise to operating pressure fast, still guaranteed reliable, the stable operation of equipment. The air process tank is provided with a pressure sensor and a pressure relief valve, the pressure sensor is used for collecting the pressure value in the air storage tank 52 and controlling the pressure relief valve to automatically open for pressure relief, so that the air compressor 55 can be started without pressure and automatically relieve the pressure after the system is overpressurized, and the safe and efficient operation of the whole set of system is ensured.

The adsorption nitrogen making device mainly comprises a first adsorption tower 53, a second adsorption tower 54, an electromagnetic valve group and a nitrogen process tank. The first adsorption tower 53 and the second adsorption tower 54 are filled with carbon molecular sieve adsorbents, and air purification is realized through alternate adsorption and regeneration of the two adsorption towers, so that the purity of nitrogen reaches a set value. The preparation of nitrogen controls the coordination action of the electromagnetic valve group through a control system, and controls the two adsorption towers to alternately adsorb and regenerate, and the specific process is as follows:

the main components of air are nitrogen and oxygen, so that adsorbents having different adsorption selectivity to nitrogen and oxygen can be selected, and an appropriate process is designed to separate nitrogen and oxygen to produce nitrogen gas. Nitrogen and oxygen both have quadrupole distances, but the quadrupole distance of nitrogen

Specific to oxygen

Much larger, and at a certain pressure, oxygen is much stronger adsorbed in carbon molecular sieve than nitrogen (oxygen has a strong force with molecular sieve surface ions). Therefore, when air passes through the adsorption bed filled with the carbon molecular sieve adsorbent in a pressurized state, oxygen is adsorbed by the carbon molecular sieve, and nitrogen is enriched in a gas phase and flows out of the adsorption bed due to less adsorption, so that the oxygen and the nitrogen are separated to obtain the nitrogen. When the carbon molecular sieve adsorbs oxygen to be close to saturation, air conveying is stopped, the pressure of the adsorption bed is reduced, the oxygen adsorbed by the carbon molecular sieve can be desorbed, and the carbon molecular sieve is regenerated and recycled. More than two adsorption beds can be switched in turn to continuously produce nitrogen.

The nitrogen process tank comprises a nitrogen storage tank 51, a control valve and the like, and is mainly used for balancing the purity and pressure of nitrogen so as to ensure continuous supply of stable nitrogen. At the moment that two adsorption towers carry out work switching, can fill the adsorption tower with some gas of itself back, play the effect of protection carbon molecular sieve and help the adsorption tower to step up. Meanwhile, the nitrogen process tank matched with the adsorption tower can ensure that the nitrogen making machine is quickly started after being stopped for a long time and is started for supplying gas after being stopped for a short time, does not need longer nitrogen making process time, and plays a very important process auxiliary role in the operation of equipment. A drying cylinder is designed behind the nitrogen process tank, and an ultra-efficient dewatering material is arranged in the cylinder, so that the moisture in the prepared nitrogen can be effectively removed, and the dew point of the produced nitrogen is less than or equal to minus 60 ℃.

The nitrogen generator can also be operated independently to provide high-purity and low-dew-point clean nitrogen for users.

The control system mainly comprises an intelligent P L C control center, a touch screen 35 and a plurality of sensors, wherein humidity, temperature and purity of gas output by a nitrogen making device in a box body can be displayed on the touch screen, all settable parameters have a memory function, resetting is not needed after power failure, the whole machine adopts a full-automatic control system to automatically determine working time, an output interface is reserved for storing, processing and alarming relevant parameters in the operation process of equipment, a data storage and recording unit is designed, a user can set a storage interval, and the system can automatically record and store relevant data on time and is used for inquiring parameters of relevant time periods in the operation of the equipment according to own needs.

Referring to fig. 7, the working principle of the self-made nitrogen-filled storage cabinet of the present invention is briefly described as follows:

1. principle of dehumidification

Self-control nitrogen fills nitrogen and stores cabinet adopt non-direct-feed formula to dehumidify fast and add the combined type technology of traditional electronic type dehumidification to dehumidify. The combination of the two dehumidification modes perfectly solves various defects of the two dehumidification modes. The non-direct-feeding aeration dehumidification adopts a mode of combining purified air and nitrogen for dehumidification, large-flow purified air is adopted to purge the equipment placing cavity at the initial stage of starting, nitrogen purging is carried out after the humidity reaches a system preset value, the oxygen content in the equipment placing cavity is reduced while the humidity in the equipment placing cavity is reduced, and therefore the storage and transportation effect is guaranteed. The traditional electronic dehumidification method adopts an environment-friendly polymer moisture absorption material and applies a shape memory alloy system dehumidification method, and equipment automatically performs switching work of moisture absorption and moisture elimination only after setting required control humidity.

When the requirement on the use humidity is high, non-direct-feeding type rapid dehumidification is used; when the requirement for using humidity is low, non-direct-feeding quick dehumidification and traditional electronic dehumidification can be used for deep dehumidification. The composite dehumidification mode can greatly prolong the service cycle of the moisture absorption material, and the desiccant is not required to be activated by frequent regeneration. Meanwhile, after power failure, the traditional environment-friendly polymer moisture absorption material with electronic dehumidification can be used for continuously dehumidifying, so that the environment in the equipment placing cavity can meet the requirements of the equipment.

2. Working principle of nitrogen production

Self-control nitrogen fill nitrogen storage cabinet adopt the mode of pressure swing adsorption nitrogen manufacturing, have simple structure, reliable, characteristics such as the operation consumption is little.

The air compressor adopts an oil-free piston compressor, so that the pollution of hydrocarbon substances to gas in the nitrogen making process is avoided. After air is compressed by an air compressor, the pressure is increased to about 0.55-0.8 MPa; cooling the compressed gas by a radiator to condense water in the compressed air, and dewatering the cooled gas by a gas ultrafiltration filter to reach an air storage tank; the treated compressed air is buffered and stabilized in an air storage tank and then enters a pressure swing adsorption nitrogen production system.

The compressed air after pressure stabilization enters an adsorption tower I and an adsorption tower II for purification, the two adsorption towers are alternately adsorbed and regenerated through a control valve group consisting of 1 three-position five-way electromagnetic valve, 2 two-position three-way electromagnetic valves, 2 one-way valves and the like, the operation is automatically controlled, and the purity of nitrogen is continuously improved until the purity of the nitrogen reaches a set value.

Referring to fig. 7, the specific process of the two adsorption towers for alternate adsorption regeneration is as follows: when the three-position five-way electromagnetic valve acts to impact the left side position, air enters the first adsorption tower, at the moment, the air is adsorbed in the first adsorption tower, and the second adsorption tower is blown off at normal pressure for regeneration; after the adsorption of the first adsorption tower is finished, the three-position five-way electromagnetic valve is opened to the middle position, and the upper pressure-equalizing and middle pressure-equalizing electromagnetic valves are opened at the same time to perform upper and middle pressure equalization on the two adsorption towers; after pressure equalization, when the three-position five-way electromagnetic valve acts and hits the right side position, air enters the second adsorption tower, at the moment, the air is adsorbed in the second adsorption tower, and the first adsorption tower is blown off and regenerated at normal pressure; after the adsorption of the second adsorption tower is finished, the three-position five-way electromagnetic valve is driven to the middle position, the upper pressure-equalizing and middle pressure-equalizing electromagnetic valves are opened simultaneously, and the upper pressure-equalizing and middle pressure-equalizing are carried out on the two adsorption towers again. The steps are repeated in this way, so that the purpose of alternate adsorption and regeneration of the two adsorption towers is achieved.

Set up a manual stop valve in last pressure-sharing department, adjust to there being certain air current to pass through, guarantee that there is certain blowback gas above two adsorption towers atmospheric pressure blowdown regeneration, improve the blowdown regeneration efficiency of molecular sieve in the adsorption tower to reach the purpose that improves molecular sieve adsorption efficiency.

To sum up, the self-made nitrogen fills nitrogen and stores cabinet has mainly solved following problem:

1. solve the problem of dehumidification efficiency

The dehumidification efficiency is an important index for measuring the products, the design adopts a three-step method for dehumidification, and the dehumidification efficiency is ensured, specifically: firstly, blowing by adopting dry compressed air, forming clean air with low water content after an air source generated by an air compressor passes through a radiator, a filter and a drying membrane, and blowing by adopting large-air-volume clean air until the humidity in an equipment placing cavity reaches a set value; secondly, nitrogen is adopted for purging, so that a user can generate high-purity nitrogen with low dew point only by providing a power supply, and the oxygen content of gas in the equipment placing cavity can be reduced while dehumidifying, so that a better storage environment is achieved; and thirdly, dehumidifying by adopting a dehumidifying box, keeping humidity balance, and automatically switching operation among three steps by a control system after a user only needs to set a humidity value without manually switching operation of a client.

2. Solving the problem of high humidity

When some special equipment is stored and the required humidity is higher than the current environmental humidity, the high-molecular moisture absorption material in the moisture absorption box is heated, and the moisture absorbed in the moisture absorption material is discharged into the equipment placing cavity; when the moisture removal requirement at one time cannot be met, the system can automatically switch, and the moisture absorption material absorbs moisture from the outside air for a period of time by controlling the turning plate to rotate, and then the moisture absorption material discharges moisture to the inside of the equipment placing cavity by controlling the turning plate to rotate; through the process, the problem that the equipment placing cavity is in a general high humidity range can be guaranteed on the premise that the humidifying module is not added.

3. The problem of nitrogen production is solved;

the nitrogen making module is designed at the bottom of the cabinet body 1, so that the gravity center of the cabinet body is reduced, and the stability is improved. In order to obtain high-purity low-dew-point nitrogen, the pressure swing adsorption adopts an unequal-potential pressure equalizing process, and the nitrogen with higher purity can be generated while the same molecular sieve is filled, and the nitrogen with high purity is realized by adopting a two-step mode: firstly, preprocessing compressed air by adopting a high-molecular membrane type air dryer, obtaining an air source with lower humidity, then making nitrogen in a pressure swing adsorption system, buffering and stabilizing the prepared high-purity nitrogen in a nitrogen storage tank, and then deeply dehumidifying in a drying cylinder to obtain the nitrogen with low dew point.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. The utility model provides a cabinet is stored to self-control nitrogen filling, includes the cabinet body (1), its characterized in that: a partition plate (11) is arranged at the lower part of the cabinet body (1); an equipment placing cavity is arranged above the partition plate (11), and a left cabinet door (21) and a right cabinet door (22) are mounted on the front side of the equipment placing cavity; a plurality of dehumidification boxes (4) are arranged on the back plate of the equipment placing cavity; and a control system and a nitrogen production system are arranged in a cavity below the partition plate (11).

2. The self-made nitrogen-filled storage cabinet of claim 1, characterized in that: the dehumidification box (4) comprises a box body (41), a middle cavity (414) and side cavities (413) positioned at two sides of the middle cavity (414) are arranged in the box body (41), the middle cavity (414) is communicated with the side cavities (413), and the side cavities (413) are respectively communicated with the inside and the outside of the cabinet body (1) through grid plates (412); turning plates (47) are respectively arranged in the side cavities (413), and a plurality of molecular sieve drying boxes (49) and turning plate control mechanisms are arranged in the middle cavity (414); the middle part of the turning plate (47) is hinged on the framework of the box body (41); the flap control mechanism comprises an electric heater (45) provided with a heating pipe (44), a memory alloy spring (46) penetrating through the heating pipe (44) and a tension spring (410), two ends of the memory alloy spring (46) are respectively connected with first torsion springs (42), and the two first torsion springs (42) are respectively connected with the upper parts of two flaps (47); two ends of the tension spring (410) are respectively connected with a second torsion spring (43), and the two second torsion springs (43) are respectively connected with the lower parts of the two turning plates (47); the box body (41) is provided with a power socket (411), and the electric heater (45) is electrically connected with the power socket (411).

3. The self-made nitrogen-filled storage cabinet of claim 2, characterized in that: the nitrogen making system comprises an air source device, an air treatment device and an adsorption nitrogen making device; the air supply device mainly comprises an air compressor (55); the air treatment device mainly comprises a condenser (57), a heat radiation fan (56), a filter and an air process tank; the adsorption nitrogen making device mainly comprises a first adsorption tower (53), a second adsorption tower (54), an electromagnetic valve group and a nitrogen process tank.

4. The self-made nitrogen-charging storage cabinet according to claim 3, wherein the control system mainly comprises an intelligent P L C control center, a touch screen (35) and a plurality of sensors.

5. The self-made nitrogen-filled storage cabinet of claim 4, wherein: the touch screen (35) is installed on the left cabinet door (21), and a starting button (32), a stopping button (31), a power indicator lamp (33) and an operation indicator lamp (34) are installed below the touch screen (35).

6. The self-made nitrogen-filled storage cabinet of claim 5, characterized in that: two universal caster wheels (13) and two directional caster wheels (15) are installed to bottom plate (14) bottom of the cabinet body (1), and supporting leg (12) that height can construct the regulation are installed respectively to the inboard of every caster wheel.

7. The self-made nitrogen-filled storage cabinet of claim 6, wherein: a plurality of layers of laminates (25) for placing the equipment are arranged in the equipment placing cavity; and a glass plate (24) is embedded on the right cabinet door (22).

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