CN211619944U - Intelligent control nitrogen generator - Google Patents
Intelligent control nitrogen generator Download PDFInfo
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- CN211619944U CN211619944U CN201922004602.5U CN201922004602U CN211619944U CN 211619944 U CN211619944 U CN 211619944U CN 201922004602 U CN201922004602 U CN 201922004602U CN 211619944 U CN211619944 U CN 211619944U
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Abstract
The utility model belongs to system nitrogen machine field specifically discloses an intelligent control system nitrogen machine, including electric cabinet, active carbon deoiling jar, air buffer tank, adsorption tower A, adsorption tower B, nitrogen filter and nitrogen buffer tank. The utility model has the advantages that the operation display is arranged on the electric cabinet, so that the activated carbon oil removal tank, the air buffer tank, the adsorption tower A, the adsorption tower B, the nitrogen filter and the nitrogen buffer tank can be controlled and displayed by the operation display; the pressure gauge of the adsorption tower A is used for testing the pressure in the adsorption tower A, the pressure gauge of the adsorption tower B is used for testing the pressure in the adsorption tower B, the nitrogen pressure gauge is used for displaying the nitrogen pressure in the nitrogen buffer tank, and the nitrogen flow meter is used for displaying the nitrogen flow output to the nitrogen using device. Through the arrangement, a worker can know the working states of the devices through the electric cabinet, so that the state monitoring is realized, and the intellectualization and convenience of the nitrogen making machine are improved.
Description
Technical Field
The utility model belongs to nitrogen generator field, in particular to intelligent control nitrogen generator.
Background
Among various nitrogen making processes, compressed air is taken as a raw material, nitrogen making by adopting a pressure swing adsorption mode is one of the most common nitrogen making modes at present, nitrogen with the purity of more than 99 percent can be obtained by one-step extraction, and the nitrogen making method has the advantages of simple structure, convenience in operation, low energy consumption and the like. The existing nitrogen making machine usually arranges all units in a workshop, the generated nitrogen is finally continuously conveyed to nearby gas using points through a pipeline, the operation of each part is generally controlled by an independent button, the monitoring is generally observed by naked eyes, the automation degree is low, the operation is inconvenient, and the labor intensity of operators is high.
SUMMERY OF THE UTILITY MODEL
The utility model provides an intelligent control nitrogen generator knows a plurality of device operating condition at any time promptly, realizes the state control, improves the intellectuality and the convenience ability of nitrogen generator, reduces staff's intensity of labour.
The technical scheme of the utility model is realized like this:
an intelligent control nitrogen making machine comprises an active carbon oil removing tank, an air buffer tank, an adsorption tower group, a nitrogen filter, an electric cabinet and a nitrogen buffer tank;
a first inlet is formed in one side of the activated carbon oil removal tank, a first outlet is formed in the other side of the activated carbon oil removal tank, and the first inlet is connected with an air source; one end of the air buffer tank is provided with a second inlet, and the other end of the air buffer tank is provided with a second outlet; the first outlet is connected with the second inlet through a first stop valve;
the adsorption tower group comprises an adsorption tower A and an adsorption tower B, the bottom of the adsorption tower A is provided with a third inlet, and the top of the adsorption tower A is provided with a third outlet; a fourth inlet is formed in the bottom of the adsorption tower B, and a fourth outlet is formed in the top of the adsorption tower B; the second outlet is connected with the third inlet through a first pneumatic valve and is connected with the fourth inlet through a second pneumatic valve; the third outlet is connected with a fourth inlet of the nitrogen filter through a third pneumatic valve, and the fourth outlet is connected with the fourth inlet through a fourth pneumatic valve;
one end of the nitrogen buffer tank is provided with a fifth inlet, and the other end of the nitrogen buffer tank is provided with a fifth outlet; a fourth outlet of the nitrogen filter is connected with the fifth inlet; the fifth outlet is provided with a second stop valve;
the electric cabinet is provided with an operation interface, an adsorption tower A pressure gauge, an adsorption tower B pressure gauge, a nitrogen pressure gauge and a nitrogen flowmeter, wherein the adsorption tower A pressure gauge is connected with the adsorption tower A, the adsorption tower B pressure gauge is connected with the adsorption tower B, the nitrogen pressure gauge is connected with the nitrogen buffer valve, and the nitrogen flowmeter is connected with the second stop valve.
Further, an inlet of the adsorption tower A is connected with a vacuum pump through a fifth pneumatic valve, and is connected with an inlet of the adsorption tower B through a sixth pneumatic valve; and the inlet of the adsorption tower B is connected with the vacuum pump through a seventh pneumatic valve.
Further, a first flow-limiting orifice plate is arranged between the first stop valve and the second inlet; the second outlet is connected with the first pneumatic valve and the second pneumatic valve through a second flow limiting orifice plate; a third flow-limiting orifice plate is arranged between the third outlet and the third pneumatic valve, and a fourth flow-limiting orifice plate is arranged between the fourth outlet and the fourth pneumatic valve;
a fifth flow-limiting orifice plate is arranged between the fifth outlet and the sixth inlet;
and a sixth flow limiting orifice plate is arranged between the sixth outlet and the second stop valve.
Further, the third restriction orifice plate and the fourth restriction orifice plate are respectively connected through a seventh stop valve and an eighth pneumatic valve.
The nitrogen detector is connected with the second stop valve through a third stop valve;
the second stop valve is connected with the nitrogen using device through a fourth stop valve.
Furthermore, the fourth stop valve is connected with an exhaust pipe, and a fifth stop valve is arranged on the exhaust pipe;
and the fourth stop valve is connected with the nitrogen using device through a sixth stop valve.
Further, the model of the nitrogen detector is MOT 500-N2.
The utility model provides an intelligent control nitrogen generator, which has the following advantages;
1) the operation display is arranged on the electric cabinet, so that the activated carbon degreasing tank, the air buffer tank, the adsorption tower A, the adsorption tower B, the nitrogen filter and the nitrogen buffer tank can be controlled and displayed through the operation display; the pressure gauge of the adsorption tower A is used for testing the pressure in the adsorption tower A, the pressure gauge of the adsorption tower B is used for testing the pressure in the adsorption tower B, the nitrogen pressure gauge is used for displaying the nitrogen pressure in the nitrogen buffer tank, and the nitrogen flow meter is used for displaying the nitrogen flow output to the nitrogen using device. The electric cabinet can show the data of each part of system nitrogen in real time, like adsorption tower A and adsorption tower B's pressure, the nitrogen gas flow of output, information such as nitrogen gas purity, the staff of being convenient for can know a plurality of device operating condition through the electric cabinet, realizes state monitoring, improves the intellectuality and the convenient performance of system nitrogen machine.
2) Adsorption tower A adsorbs the oxygen in the compressed air with the adsorption tower in turn, adsorption tower A (or adsorption tower B) work, adsorption tower A (or adsorption tower B) adsorbs the oxygen in the compressed air, when obtaining nitrogen gas, reduce the pressure in adsorption tower B (or adsorption tower A) by the vacuum pump for adsorption tower B (or adsorption tower A) regeneration is convenient for make nitrogen gas, improves the purity of nitrogen gas, prolongs vacuum pump's life simultaneously.
3) The device can be used in nitrogen stations of large-scale factories, and the purity of the prepared nitrogen can reach 99.99 percent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is the utility model provides a pair of intelligent control nitrogen generator's schematic structure diagram.
In the figure:
1. an active carbon oil removal tank; 2. an air buffer tank; 3. an adsorption tower A; 4. an adsorption tower B; 5. a nitrogen filter; 6. a nitrogen buffer tank; 7-1, a first pneumatic valve; 7-2, a second pneumatic valve; 7-3, a third pneumatic valve; 7-4, a fourth pneumatic valve; 7-5, a fifth pneumatic valve; 7-6, a sixth pneumatic valve; 7-7, a seventh pneumatic valve; 7-8, an eighth pneumatic valve; 8-1, a first stop valve; 8-2, a second stop valve; 8-3, a third stop valve; 8-4, a fourth stop valve; 8-5, a fifth stop valve; 8-6, a sixth stop valve; 8-7, a seventh stop valve; 9. a nitrogen detector; 10. a vacuum pump.
Detailed Description
The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.
As shown in fig. 1, an intelligent control nitrogen generator comprises an electric cabinet, an activated carbon oil removal tank 1, an air buffer tank 2, an adsorption tower a3, an adsorption tower B4, a nitrogen filter 5 and a nitrogen buffer tank 6; the electric cabinet is provided with an operation display, an adsorption tower A pressure gauge, an adsorption tower B pressure gauge, a nitrogen pressure gauge and a nitrogen flow meter, wherein the adsorption tower A pressure gauge is connected with the adsorption tower A3, and the adsorption tower B pressure gauge is connected with the adsorption tower B4; the nitrogen pressure gauge is connected with the nitrogen buffer tank 6;
a first inlet is arranged on one side of the activated carbon oil removal tank 1, a first outlet is arranged on the other side of the activated carbon oil removal tank, and the first inlet is connected with an air source; one end of the air buffer tank 2 is provided with a second inlet, and the other end is provided with a second outlet; the first outlet is connected with the second inlet through a first stop valve 8-1;
the adsorption tower group comprises an adsorption tower A3 and an adsorption tower B4, the bottom of the adsorption tower A3 is provided with a third inlet, and the top of the adsorption tower A3 is provided with a third outlet; a fourth inlet is formed in the bottom of the adsorption tower B4, and a fourth outlet is formed in the top of the adsorption tower B4; the second outlet is connected with the third inlet through a first pneumatic valve 7-1 and is connected with the fourth inlet through a second pneumatic valve 7-2; the third outlet is connected with a fourth inlet of the nitrogen filter 5 through a third pneumatic valve 7-3, and the fourth outlet is connected with the fourth inlet through a fourth pneumatic valve 7-4;
one end of the nitrogen buffer tank 6 is provided with a fifth inlet, and the other end is provided with a fifth outlet; the fourth outlet of the nitrogen filter 5 is connected with the fifth inlet; and a second stop valve 8-2 is arranged at the fifth outlet, and the second stop valve 8-2 is connected with a nitrogen flow meter.
In the above, by arranging the operation display on the electric cabinet, the activated carbon degreasing tank 1, the air buffer tank 2, the adsorption tower a3, the adsorption tower B4, the nitrogen filter 5 and the nitrogen buffer tank 6 can be controlled and displayed by the operation display; the pressure gauge of the adsorption tower A is used for testing the pressure in the adsorption tower A3, the pressure gauge of the adsorption tower B is used for testing the pressure in the adsorption tower B4, the nitrogen pressure gauge is used for displaying the nitrogen pressure in the nitrogen buffer tank 6, and the nitrogen flowmeter is used for displaying the nitrogen flow output to the nitrogen using device. Through the arrangement, a worker can know the working states of the devices through the electric cabinet, so that the state monitoring is realized, and the intellectualization and convenience of the nitrogen making machine are improved.
Compressed air enters the activated carbon oil removal tank 1, and the activated carbon oil removal tank 1 is used for removing oil in the compressed air, so that the purification effect of the compressed air is improved.
The compressed air from the activated carbon degreasing tank 1 enters the air buffer tank 2, the air buffer tank 2 can keep the stability of air supply pressure, and the adsorption tower A3 and the adsorption tower B4 are convenient for adsorbing oxygen in the compressed air to obtain nitrogen.
The nitrogen filter 5 can filter nitrogen coming out of the adsorption tower group, and the nitrogen purity is improved.
The nitrogen buffer tank 6 is used for balancing the pressure and purity of the nitrogen from the nitrogen filter 5, and ensures stable continuous nitrogen supply.
The adsorption tower A3 and the adsorption tower B4 can adsorb oxygen in compressed air and improve the nitrogen concentration; the purity of nitrogen can be guaranteed to two adsorption towers settings. In the above, the first pneumatic valve 7-1 and the third pneumatic valve 7-3 are opened, the second pneumatic valve 7-2 and the fourth pneumatic valve 7-4 are closed, the compressed air in the air buffer tank 2 enters the adsorption tower A3, the adsorption tower A3 adsorbs oxygen in the compressed air, the nitrogen flows out from the third outlet of the adsorption tower A3 and enters the nitrogen buffer tank 6, the nitrogen buffer tank 6 balances the pressure and purity of the nitrogen, and the nitrogen is output from the sixth outlet; the first pneumatic valve 7-1 and the third pneumatic valve 7-3 are closed, the second pneumatic valve 7-2 and the fourth pneumatic valve 7-4 are opened, the compressed air in the air buffer tank 2 enters the adsorption tower B4, the adsorption tower B4 adsorbs oxygen in the compressed air, the nitrogen flows out from the fifth outlet of the adsorption tower B4 and enters the nitrogen buffer tank 6, the nitrogen buffer tank 6 balances the pressure and the purity of the nitrogen, and the nitrogen is output from the sixth outlet. The two adsorption towers work in shift to ensure that one adsorption tower works and the other adsorption tower is regenerated to ensure the purity of nitrogen.
It should be noted that, in order to ensure the purity of the nitrogen gas, the third inlet of the adsorption tower a3 is connected with the vacuum pump 10 through the fifth pneumatic valve 7-5, and is connected with the fourth inlet of the adsorption tower B4 through the sixth pneumatic valve 7-6; the fourth inlet of the adsorption tower B4 is connected to the vacuum pump 10 through a seventh air-operated valve 7-7. As described above, the adsorption column A3 (or the adsorption column B4) operates, the adsorption column A3 (or the adsorption column B4) adsorbs oxygen in the compressed air, when nitrogen gas is obtained, the fifth air-operated valve 7-5 (or the seventh air-operated valve 7-7) is turned off, the seventh air-operated valve 7-7 (or the fifth air-operated valve 7-5) and the vacuum pump 10 operate, and the vacuum pump 10 reduces the pressure in the adsorption column B4 (or the adsorption column A3) to regenerate the adsorption column B4 (or the adsorption column A3), thereby extending the service life of the vacuum pump 10.
In the present embodiment, a first restriction orifice plate is provided between the first cut-off valve 8-1 and the second inlet; the second outlet is connected with the first pneumatic valve 7-1 and the second pneumatic valve 7-2 through a second flow limiting orifice plate; a third flow limiting orifice plate is arranged between the third outlet and the third pneumatic valve 7-3, and a fourth flow limiting orifice plate is arranged between the fourth outlet and the fourth pneumatic valve 7-4; a fifth flow-limiting orifice plate is arranged between the fifth outlet and the sixth inlet; a sixth flow limiting orifice plate is arranged between the sixth outlet and the second stop valve 8-2. The first flow limiting orifice plate, the second flow limiting orifice plate, the third flow limiting orifice plate, the fourth flow limiting orifice plate, the fifth flow limiting orifice plate and the sixth flow limiting orifice plate are connected in a detachable connection mode, and the flow limiting function is achieved.
The third flow-limiting orifice plate and the fourth flow-limiting orifice plate are respectively connected through a seventh stop valve 8-7 and an eighth pneumatic valve 7-8.
In the embodiment, the device further comprises a nitrogen detector 9, wherein the nitrogen detector 9 is connected with the second stop valve 8-2 through a third stop valve 8-3; the second stop valve 8-2 is connected with a nitrogen using device through a fourth stop valve 8-4. Wherein, nitrogen gas detector 9 can detect nitrogen gas purity, is convenient for learn the nitrogen gas purity of intelligent control nitrogen generator output.
In the embodiment, the fourth stop valve 8-4 is connected with an exhaust pipe, and the exhaust pipe is provided with a fifth stop valve 8-5; the fourth stop valve 8-4 is connected with a nitrogen using device through a sixth stop valve 8-6. The nitrogen detector 9 detects that the purity of the nitrogen is unqualified, the fourth stop valve 8-4 and the fifth stop valve 8-5 work, the sixth stop valve 8-6 is closed, and the unqualified nitrogen is discharged from the exhaust pipe; when the nitrogen detector 9 detects that the purity of the nitrogen is qualified, the fourth stop valve 8-4 and the sixth stop valve 8-6 work, the fifth stop valve 8-5 is closed, and the nitrogen with qualified purity is conveyed to a nitrogen using device.
It should be noted that all pneumatic valves are model number FV-1001 and all shut-off valves are model number J621Y-320P.
In the present embodiment, the nitrogen gas detector 9 is a model number MOT 500-N2.
With reference to fig. 1, the working principle of the intelligent control nitrogen generator provided by the present invention is described:
compressed air enters an activated carbon oil removal tank 1, the activated carbon oil removal tank 1 is used for removing oil in the compressed air, a first pneumatic valve 7-1 and a third pneumatic valve 7-3 are opened, a second pneumatic valve 7-2 and a fourth pneumatic valve 7-4 are closed, the compressed air in an air buffer tank 2 enters an adsorption tower A3, oxygen in the compressed air is adsorbed by an adsorption tower A3, nitrogen enters a nitrogen filter 5 from an adsorption tower A3, and the nitrogen is purified by the nitrogen filter 5; when the adsorption tower A3 works, the adsorption tower A3 adsorbs oxygen in the compressed air, when nitrogen is obtained, the fifth pneumatic valve 7-5 is closed, the seventh pneumatic valve 7-7 and the vacuum pump 10 work, the vacuum pump 10 reduces the pressure in the adsorption tower B4, so that the adsorption tower B4 is regenerated, and meanwhile, the service life of the vacuum pump 10 is prolonged.
After the nitrogen detector 9 detects that the electric is unqualified, the first pneumatic valve 7-1 and the third pneumatic valve 7-3 are closed, the second pneumatic valve 7-2 and the fourth pneumatic valve 7-4 are opened, the compressed air in the air buffer tank 2 enters the adsorption tower B4, oxygen in the compressed air is adsorbed by the adsorption tower B4, the nitrogen enters the nitrogen filter 5 from the adsorption tower B4, and the nitrogen is purified by the nitrogen filter 5. When the adsorption tower B4 operates, the adsorption tower B4 adsorbs oxygen in the compressed air, when nitrogen is obtained, the seventh pneumatic valve 7-7 is closed, the fifth pneumatic valve 7-5 and the vacuum pump 10 operate, the vacuum pump 10 reduces the pressure in the adsorption tower A3, so that the adsorption tower A3 regenerates, and the operation is performed periodically.
The nitrogen filter 5 purifies the nitrogen, and then the nitrogen enters a nitrogen buffer valve, and the gas with qualified purity enters a nitrogen using device.
The active carbon deoiling jar 1 of electric cabinet controllable, air buffer tank 2, adsorption tower A3, adsorption tower B4, nitrogen filter 5 and nitrogen buffer tank 6, the staff of being convenient for can know a plurality of device operating condition through the electric cabinet, realizes the state control, improves the intellectuality and the convenient performance of nitrogen generator.
The utility model provides a pair of intelligent control nitrogen generator can show the data of each part of nitrogen generation in real time, like adsorption tower A3 and adsorption tower B4's pressure, the nitrogen gas flow of output, nitrogen gas purity etc. the operating condition of each part of nitrogen generator is known, is controlled in real time to the staff of being convenient for, has realized the full automated control at mill's nitrogen station, has very high practical value.
It should be noted that the present invention does not relate to an improvement of the circuit.
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. An intelligent control nitrogen making machine comprises an electric cabinet, an active carbon oil removal tank, an air buffer tank, an adsorption tower A, an adsorption tower B, a nitrogen filter and a nitrogen buffer tank; the device is characterized in that an operation display, an adsorption tower A pressure gauge, an adsorption tower B pressure gauge, a nitrogen pressure gauge and a nitrogen flow meter are arranged on the electric cabinet, the adsorption tower A pressure gauge is connected with the adsorption tower A, and the adsorption tower B pressure gauge is connected with the adsorption tower B; the nitrogen pressure gauge is connected with the nitrogen buffer tank;
a first inlet is formed in one side of the activated carbon oil removal tank, a first outlet is formed in the other side of the activated carbon oil removal tank, and the first inlet is connected with an air source; one end of the air buffer tank is provided with a second inlet, and the other end of the air buffer tank is provided with a second outlet; the first outlet is connected with the second inlet through a first stop valve;
the adsorption tower group comprises an adsorption tower A and an adsorption tower B, the bottom of the adsorption tower A is provided with a third inlet, and the top of the adsorption tower A is provided with a third outlet; a fourth inlet is formed in the bottom of the adsorption tower B, and a fourth outlet is formed in the top of the adsorption tower B; the second outlet is connected with the third inlet through a first pneumatic valve and is connected with the fourth inlet through a second pneumatic valve; the third outlet is connected with a fourth inlet of the nitrogen filter through a third pneumatic valve, and the fourth outlet is connected with the fourth inlet through a fourth pneumatic valve;
one end of the nitrogen buffer tank is provided with a fifth inlet, and the other end of the nitrogen buffer tank is provided with a fifth outlet; the fourth outlet is connected with the fifth inlet; and a second stop valve is arranged at the fifth outlet and connected with the nitrogen flowmeter.
2. The intelligent control nitrogen generator as claimed in claim 1, wherein the inlet of the adsorption tower A is connected with the vacuum pump through a fifth pneumatic valve and is connected with the inlet of the adsorption tower B through a sixth pneumatic valve; and the inlet of the adsorption tower B is connected with the vacuum pump through a seventh pneumatic valve.
3. The intelligent controlled nitrogen generator as recited in claim 1, wherein a first restriction orifice plate is disposed between said first shut-off valve and said second inlet; the second outlet is connected with the first pneumatic valve and the second pneumatic valve through a second flow limiting orifice plate; a third flow-limiting orifice plate is arranged between the third outlet and the third pneumatic valve, and a fourth flow-limiting orifice plate is arranged between the fourth outlet and the fourth pneumatic valve;
a fifth flow-limiting orifice plate is arranged between the fifth outlet and the sixth inlet;
and a sixth flow limiting orifice plate is arranged between the sixth outlet and the second stop valve.
4. The intelligent controlled nitrogen generator as claimed in claim 3, wherein the third and fourth restricted orifice plates are connected by a seventh and eighth stop valve, respectively.
5. The intelligent control nitrogen generator as claimed in claim 1, further comprising a nitrogen gas detector connected to the second stop valve through a third stop valve;
the second stop valve is connected with the nitrogen using device through a fourth stop valve.
6. The intelligent control nitrogen generator as claimed in claim 5, wherein the fourth stop valve is connected with an exhaust pipe, and a fifth stop valve is arranged on the exhaust pipe;
and the fourth stop valve is connected with the nitrogen using device through a sixth stop valve.
7. The intelligent control nitrogen generator as claimed in claim 5, wherein said nitrogen detector is model number MOT 500-N2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922004602.5U CN211619944U (en) | 2019-11-18 | 2019-11-18 | Intelligent control nitrogen generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922004602.5U CN211619944U (en) | 2019-11-18 | 2019-11-18 | Intelligent control nitrogen generator |
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| CN211619944U true CN211619944U (en) | 2020-10-02 |
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| CN201922004602.5U Active CN211619944U (en) | 2019-11-18 | 2019-11-18 | Intelligent control nitrogen generator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112250045A (en) * | 2020-10-23 | 2021-01-22 | 宁波岚新空分设备科技有限公司 | Nitrogen preparation system capable of realizing high precision and different concentrations |
| CN112295360A (en) * | 2020-10-23 | 2021-02-02 | 宁波岚新空分设备科技有限公司 | Pressure swing adsorption nitrogen preparation system |
-
2019
- 2019-11-18 CN CN201922004602.5U patent/CN211619944U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112250045A (en) * | 2020-10-23 | 2021-01-22 | 宁波岚新空分设备科技有限公司 | Nitrogen preparation system capable of realizing high precision and different concentrations |
| CN112295360A (en) * | 2020-10-23 | 2021-02-02 | 宁波岚新空分设备科技有限公司 | Pressure swing adsorption nitrogen preparation system |
| CN112250045B (en) * | 2020-10-23 | 2023-09-08 | 宁波岚新空分设备科技有限公司 | Can realize different concentration nitrogen gas preparation system of high accuracy |
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