CN218494763U - Automatic nitrogen filling maintenance control device for large-scale container in early arrival - Google Patents
Automatic nitrogen filling maintenance control device for large-scale container in early arrival Download PDFInfo
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- CN218494763U CN218494763U CN202221946418.8U CN202221946418U CN218494763U CN 218494763 U CN218494763 U CN 218494763U CN 202221946418 U CN202221946418 U CN 202221946418U CN 218494763 U CN218494763 U CN 218494763U
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Abstract
The application provides an automatic nitrogen-filling maintenance control device for a large-scale container from an early arrival factory, which comprises a first compressed nitrogen bottle group, a second gas-filling branch, a second automatic gas-filling device, a second large-scale container and a communicating pipe; the first air supply main pipe is connected with the first compressed nitrogen bottle group, the first air supply branch is connected with the first air supply main pipe, the first automatic air supply device is connected with the first air supply branch, and the first large container is connected with the first automatic air supply device. The device utilizes the automatic control principle, has realized automatic air supplement, exhaust and the safety protection to large container, through be provided with communicating pipe between the female pipe of first tonifying qi and the female pipe of second tonifying qi, can realize the undisturbed switching of nitrogen gas replenishment, through the setting of nitrogen generator for need not to change and carry the nitrogen cylinder and can carry out the maintenance to first large container and second large container in the large container storage period.
Description
Technical Field
The application belongs to the technical field of equipment nitrogen filling dry maintenance, and particularly relates to an automatic nitrogen filling maintenance control device for large-scale containers which arrive at a factory in advance.
Background
At present, large equipment of engineering projects such as nuclear power plants and the like are manufactured from a manufacturing plant and are delivered to the plant, and the large equipment generally needs to be temporarily stored in a temporary warehouse on a construction site, the large equipment is also generally called as early-stage delivery equipment, and nitrogen charging dry maintenance is generally adopted to prevent oxidation, corrosion and rusting during the storage of the temporary warehouse in the plant. At present, most of nuclear power plants adopt an original nitrogen cylinder manual operation mode, namely, a worker regularly inspects the nitrogen pressure for maintenance in a large container every several hours, the pressure is low, a manual operation air supply device is needed, meanwhile, the problems that the personnel replace a waste gas cylinder and carry the nitrogen cylinder exist, the labor cost is increased, and the efficiency is not high.
SUMMERY OF THE UTILITY MODEL
Therefore, the technical problem that this application will be solved lies in providing an automatic maintenance controlling means that fills of factory's large-scale container in advance, can realize the undisturbed switching of nitrogen gas replenishment, can realize filling nitrogen maintenance control to first large-scale container and second large-scale container are automatic, need not personnel's on duty, improve work efficiency greatly.
In order to solve the above problems, the present application provides an automatic nitrogen-filling maintenance control device for a large-scale container from an early stage to a factory, which includes a first compressed nitrogen bottle group, a first main gas-filling pipe, a first gas-filling branch, a first automatic gas-filling device, a first large-scale container, a second compressed nitrogen bottle group, a second main gas-filling pipe, a second gas-filling branch, a second automatic gas-filling device, a second large-scale container and a communicating pipe;
the first main gas supplementing pipe is connected with the first compressed nitrogen bottle group, the first gas supplementing branch is connected with the first main gas supplementing pipe, the first automatic gas supplementing device is connected with the first gas supplementing branch, and the first large container is connected with the first automatic gas supplementing device;
the second air supply main pipe is connected with the second compressed nitrogen bottle group, the second air supply branch is connected with the second air supply main pipe, the second automatic air supply device is connected with the second air supply branch, and the second large container is connected with the second automatic air supply device;
and a communicating pipe is connected between the first air supply main pipe and the second air supply main pipe.
Optionally, the first air supply branch and the second air supply branch are both multiple and arranged in parallel.
Optionally, the first air supply main pipe is sequentially provided with a first pressure reducing valve, a first check valve and a first pneumatic isolation valve; and a second pressure reducing valve, a second check valve and a second pneumatic isolating valve are sequentially arranged on the second air supplementing main pipe.
Optionally, a first pressure difference detection pipeline is arranged on the first air supply main pipe and between the rear side of the first pressure reducing valve and the first automatic air supply device, and a first pressure control switch is arranged on the first pressure difference detection pipeline.
Optionally, a second pressure difference detection pipeline is arranged on the second air supply main pipe and between the rear side of the second pressure reducing valve and the second automatic air supply device, and a second pressure control switch is arranged on the second pressure difference detection pipeline.
Optionally, still include nitrogen generator, first gas tube and second gas tube, nitrogen generator passes through first gas tube with first compressed nitrogen bottle group is connected, nitrogen generator passes through the second gas tube with second compressed nitrogen bottle group is connected, can be right first compressed nitrogen bottle group with second compressed nitrogen bottle group provides nitrogen gas.
Optionally, a third pneumatic isolation valve is arranged on the first inflation tube, and a fourth pneumatic isolation valve is arranged on the second inflation tube.
Optionally, a third pressure control switch is arranged between the first compressed nitrogen cylinder group and the nitrogen making machine, the third pressure control switch can detect the pressure of the first compressed nitrogen cylinder group, and when the detected pressure is lower than a preset value, the nitrogen making machine and the third pneumatic isolation valve are controlled to be opened to supplement air to the first compressed nitrogen cylinder group.
Optionally, a fourth pressure control switch is arranged between the second compressed nitrogen cylinder group and the nitrogen making machine, the fourth pressure control switch can detect the pressure of the second compressed nitrogen cylinder group, and when the detected pressure is lower than a preset value, the nitrogen making machine and the fourth pneumatic isolation valve are controlled to be opened to supplement air to the second compressed nitrogen cylinder group.
Optionally, a first safety valve is arranged on the first compressed nitrogen cylinder group, and a second safety valve is arranged on the second compressed nitrogen cylinder group.
Advantageous effects
The embodiment of the utility model provides an automatic maintenance controlling means that fills nitrogen of earlier large-scale container to factory that provides, the device utilizes the automatic control principle, realized the automatic air supplement to large-scale container, exhaust and safety protection, through be provided with communicating pipe between the female pipe of first tonifying qi female pipe and second tonifying qi female pipe, can realize the undisturbed switching of nitrogen gas replenishment, through the setting of nitrogen generator for need not to change and carry the nitrogen cylinder and can maintain first large-scale container and second large-scale container during large-scale container stores.
Drawings
FIG. 1 is a flow chart of an automatic nitrogen-filling maintenance control device for a large-sized container from the beginning of the present application.
The reference numbers are given as:
1. a first compressed nitrogen cylinder group; 2. a first air supply main pipe; 3. a first air supply branch; 4. a first automatic air supply device; 5. a first large vessel; 6. a second compressed nitrogen cylinder group; 7. a second air supply main pipe; 8. a second air supply branch; 9. a second automatic air supply device; 10. a second large vessel; 11. a communicating pipe; 12. a first pressure reducing valve; 13. a first check valve; 14. a first pneumatic isolation valve; 15. a second pressure reducing valve; 16. a second check valve; 17. a second pneumatic isolation valve; 18. a first differential pressure detection line; 19. a first pressure control switch; 20. a second differential pressure detection line; 21. a second pressure control switch; 22. a nitrogen making machine; 23. a first gas-filled tube; 24. a second gas-filled tube; 25. a third pneumatic isolation valve; 26. a fourth pneumatic isolation valve; 27. a third pressure control switch; 28. a fourth pressure control switch; 29. a first safety valve; 30. a second relief valve.
Detailed Description
In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely for convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixed and removable connections or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
Referring to fig. 1 in combination, according to an embodiment of the present application, an automatic nitrogen-filling maintenance control device for a large-scale container from an early stage to a factory includes a first compressed nitrogen bottle group 1, a first main gas-filling pipe 2, a first gas-filling branch 3, a first automatic gas-filling device 4, a first large-scale container 5, a second compressed nitrogen bottle group 6, a second main gas-filling pipe 7, a second gas-filling branch 8, a second automatic gas-filling device 9, a second large-scale container 10, and a communicating pipe 11; the first gas supplementing main pipe 2 is connected with the first compressed nitrogen bottle group 1, the first gas supplementing branch 3 is connected with the first gas supplementing main pipe 2, the first automatic gas supplementing device 4 is connected with the first gas supplementing branch 3, and the first large container 5 is connected with the first automatic gas supplementing device 4; the second main gas supplementing pipe 7 is connected with the second compressed nitrogen bottle group 6, the second gas supplementing branch 8 is connected with the second main gas supplementing pipe 7, the second automatic gas supplementing device 9 is connected with the second gas supplementing branch 8, and the second large container 10 is connected with the second automatic gas supplementing device 9; a communicating pipe 11 is connected between the first air supply main pipe 2 and the second air supply main pipe 7. This device utilizes the automatic control principle, has realized automatic air supplement, exhaust and safety protection to first large-scale container 5 and second large-scale container 10, through the setting of communicating pipe 11 between first tonifying qi female pipe 2 and the second tonifying qi female pipe 7 for first tonifying qi female pipe 2 and second tonifying qi female pipe 7 are linked together, can realize nitrogen gas supplementing's undisturbed switching.
The first compressed nitrogen bottle group 1 and the second compressed nitrogen bottle group 6 are used as a gas source for nitrogen supplement, the nitrogen can be stored, the nitrogen in the first compressed nitrogen bottle group 1 is supplemented to the first large container 5 through the first main gas supplementing pipe 2, the first gas supplementing branch 3 and the first automatic gas supplementing device 4, the nitrogen in the second compressed nitrogen bottle group 6 is supplemented to the second large container 10 through the second main gas supplementing pipe 7, the second gas supplementing branch 8 and the second automatic gas supplementing device 9, the nitrogen is supplemented to the first large container 5 and the second large container 10, the communicating pipe 11 is connected between the first main gas supplementing pipe 2 and the second main gas supplementing pipe 7, a communicating gas path is formed between the first main gas supplementing pipe 2 and the second main gas supplementing pipe 7, and undisturbed switching of nitrogen supplement can be achieved.
The first automatic air supply device 4 and the second automatic air supply device 9 are existing devices, the automatic air supply devices are complete equipment, air supply, exhaust, safety protection and self-holding electrical control loops are integrated, and the automatic air supply device can be operated automatically or manually; the exhaust outlets are all provided with the silencers, so that the harsh noise generated when high-pressure gas is exhausted is greatly reduced; the gas supply device is internally provided with a safety valve, self protection under abnormal conditions can be realized, and a structural mode of a double filter at an inlet and an outlet is adopted, so that the device can normally work when a gas source is unclean, and the influence on normal work caused by the fact that pipeline rust outside the device falls into the device from a gas outlet at the upper end of the device can also be avoided. Aiming at a large container needing nitrogen filling, the gas supplementing device can be manually operated, and the selection of equipment needing gas supplementing is realized. And then the automatic air supply device realizes automatic operation. If a large container needs to be withdrawn from dry maintenance according to engineering requirements, the automatic air supplement device is manually operated to a closed position, and if necessary, the equipment manually exhausts air through the air supplement device, so that the automatic air supplement of the large container which needs nitrogen dry maintenance in the series is not influenced.
The first air supply branch 3 and the second air supply branch 8 are multiple and arranged in parallel.
Wherein, first tonifying qi branch road 3 is many and sets up side by side, and first tonifying qi branch road 3 is connected with first tonifying qi female pipe 2, and second tonifying qi branch road 8 is many and sets up side by side, and second tonifying qi branch road 8 is connected with second tonifying qi female pipe 7, is many and sets up side by side through first tonifying qi branch road 3 and second tonifying qi branch road 8, can realize carrying out the maintenance simultaneously to a plurality of first macro container 5 and the macro container 10 of second during the use and arrange.
The first main air supply pipe 2 is sequentially provided with a first pressure reducing valve 12, a first check valve 13 and a first pneumatic isolation valve 14; the second air supply main pipe 7 is sequentially provided with a second pressure reducing valve 15, a second check valve 16 and a second pneumatic isolating valve 17.
Wherein, install first relief pressure valve 12 on the first main pipe 2 of tonifying qi in proper order, first check valve 13 and first pneumatic isolating valve 14, install second relief pressure valve 15 on the second main pipe 7 of tonifying qi in proper order, second check valve 16 and the pneumatic isolating valve 17 of second, the installation of first relief pressure valve 12 and second relief pressure valve 15 can be with the transmission after the nitrogen gas step-down to suitable pressure value in the first main pipe 2 of tonifying qi and the second main pipe 7 of tonifying qi, the nitrogen gas in the first main pipe 2 of tonifying qi and the second main pipe 7 of tonifying qi appears the backward flow in the setting up of first check valve 13 and second check valve 16, first pneumatic isolating valve 14 and the pneumatic isolating valve 17 of second are used for controlling the first main pipe 2 of tonifying qi and the main pipe 7 nitrogen gas circulation of second tonifying qi.
A first pressure difference detection pipeline 18 is arranged on the first air supply main pipe 2 and between the rear side of the first reducing valve 12 and the first automatic air supply device 4, and a first pressure control switch 19 is arranged on the first pressure difference detection pipeline 18.
One end of the first pressure difference detection pipeline 18 is connected with the first air supply main pipe 2, the connection point is located at the rear side of the first pressure reducing valve 12, the other end of the first pressure difference detection pipeline is connected with the first automatic air supply device 4, the first pressure control switch 19 is installed on the first pressure difference detection pipeline 18, so that the gas pressure behind the first pressure reducing valve 12 and the gas pressure on the first automatic air supply device 4 can be detected through the first pressure control switch 19, when the rear side pressure of the first pressure reducing valve 12 is smaller than or equal to the pressure at the first automatic air supply device 4, the gas pressure is insufficient, the first pressure control switch 19 can control the first pneumatic isolation valve 14 on the first air supply main pipe 2 to be closed to block the air flow, and at the moment, the gas on the second air supply main pipe 7 can enter the first air supply main pipe 2 through the communication pipe 11 to maintain the first large container 5 on the first air supply branch 3.
A second pressure difference detection pipeline 20 is arranged on the second air supplementing main pipe 7 and between the rear side of the second reducing valve 15 and the second automatic air supplementing device 9, and a second pressure control switch 21 is arranged on the second pressure difference detection pipeline 20.
One end of the second pressure difference detection pipeline 20 is connected to the second main air supply pipe 7, the connection point is located at the rear side of the second pressure reducing valve 15, the other end of the second pressure difference detection pipeline is connected to the second automatic air supply device 9, the second pressure control switch 21 is installed on the second pressure difference detection pipeline 20, so that the gas pressure behind the second pressure reducing valve 15 and the gas pressure on the second automatic air supply device 9 can be detected through the second pressure control switch 21, when the rear side pressure of the second pressure reducing valve 15 is smaller than or equal to the pressure at the second automatic air supply device 9, it is indicated that the gas pressure is insufficient, the second pressure control switch 21 can control the second pneumatic isolation valve 17 located on the second main air supply pipe 7 to close to block the air flow, at this time, the gas on the first main air supply pipe 2 can enter the second main air supply pipe 7 through the communication pipe 11 to maintain the second large container 10 located on the second air supply branch 8.
Therefore, the undisturbed switching of nitrogen supplement can be realized by arranging the communicating pipe 11 between the first supplementing main pipe 2 and the second supplementing main pipe 7.
Still include nitrogen generator 22, first gas tube 23 and second gas tube 24, nitrogen generator 22 is connected with first compressed nitrogen bottle group 1 through first gas tube 23, and nitrogen generator 22 is connected with second compressed nitrogen bottle group 6 through second gas tube 24, can provide nitrogen gas to first compressed nitrogen bottle group 1 and second compressed nitrogen bottle group 6.
The first inflation tube 23 is provided with a third pneumatic isolation valve 25, and the second inflation tube 24 is provided with a fourth pneumatic isolation valve 26.
A third pressure control switch 27 is arranged between the first compressed nitrogen cylinder group 1 and the nitrogen making machine 22, the third pressure control switch 27 can detect the pressure of the first compressed nitrogen cylinder group 1, and when the detected pressure is lower than a preset value, the nitrogen making machine 22 and the third pneumatic isolation valve 25 are controlled to be opened to supplement air for the first compressed nitrogen cylinder group 1.
Wherein, install the third pressure control switch 27 between first compressed nitrogen gas bottle group 1 and nitrogen generator 22, the third pressure control switch 27 can detect first compressed nitrogen gas bottle group 1 internal pressure, and when the pressure value that detects was less than 50% of initial pressure value, the start-up of nitrogen generator 22 is controlled to the third pressure control switch 27 to the control is located the third pneumatic isolating valve 25 between nitrogen generator 22 and the first compressed nitrogen gas bottle group 1 and opens, and nitrogen generator 22 can provide nitrogen gas for first compressed nitrogen gas bottle group 1.
A fourth pressure control switch 28 is arranged between the second compressed nitrogen cylinder group 6 and the nitrogen making machine 22, the fourth pressure control switch 28 can detect the pressure of the second compressed nitrogen cylinder group 6, and when the detected pressure is lower than a preset value, the nitrogen making machine 22 and the fourth pneumatic isolation valve 26 are controlled to be opened to supplement gas for the second compressed nitrogen cylinder group 6.
Wherein, install fourth pressure control switch 28 between second compressed nitrogen gas bottle group 6 and nitrogen generator 22, fourth pressure control switch 28 can detect the pressure in second compressed nitrogen gas bottle group 6, and when the pressure value that detects was less than 50% of initial pressure value, fourth pressure control switch 28 control nitrogen generator 22 starts to control the fourth pneumatic isolating valve 26 who is located between nitrogen generator 22 and the second compressed nitrogen gas bottle group 6 and open, nitrogen generator 22 can provide nitrogen gas for second compressed nitrogen gas bottle group 6.
Therefore, through the setting of the third pressure control switch 27 and the fourth pressure control switch 28, the nitrogen supplementing of the first compressed nitrogen cylinder group 1 and the second compressed nitrogen cylinder group 6 by the nitrogen making machine 22 can be automatically controlled, the manual operation is not needed, and the frequent starting of the nitrogen making machine 22 is avoided through the setting of the preset value of the air supplementing pressure.
The first compressed nitrogen cylinder group 1 is provided with a first safety valve 29, and the second compressed nitrogen cylinder group 6 is provided with a second safety valve 30.
The first safety valve 29 is mounted on the first compressed nitrogen cylinder group 1, and the second safety valve 30 is mounted on the second compressed nitrogen cylinder group 6, so that overpressure protection and alarm of the first compressed nitrogen cylinder group 1 and the second compressed nitrogen cylinder group 6 are achieved.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.
Claims (10)
1. An automatic nitrogen-filling maintenance control device for a large-scale container from an early arrival factory is characterized by comprising a first compressed nitrogen bottle group (1), a first gas-supplementing main pipe (2), a first gas-supplementing branch (3), a first automatic gas-supplementing device (4), a first large-scale container (5), a second compressed nitrogen bottle group (6), a second gas-supplementing main pipe (7), a second gas-supplementing branch (8), a second automatic gas-supplementing device (9), a second large-scale container (10) and a communicating pipe (11);
the first main gas supplementing pipe (2) is connected with the first compressed nitrogen bottle group (1), the first gas supplementing branch (3) is connected with the first main gas supplementing pipe (2), the first automatic gas supplementing device (4) is connected with the first gas supplementing branch (3), and the first large container (5) is connected with the first automatic gas supplementing device (4);
the second main air supply pipe (7) is connected with the second compressed nitrogen bottle group (6), the second air supply branch (8) is connected with the second main air supply pipe (7), the second automatic air supply device (9) is connected with the second air supply branch (8), and the second large container (10) is connected with the second automatic air supply device (9);
and a communicating pipe (11) is connected between the first air supplementing main pipe (2) and the second air supplementing main pipe (7).
2. The automatic nitrogen-filling maintenance control device for the advanced large-scale container in the factory according to claim 1, wherein the first gas-filling branch (3) and the second gas-filling branch (8) are arranged in parallel.
3. The automatic nitrogen-filling maintenance control device for the advanced large-scale container in the factory according to claim 1, wherein a first pressure reducing valve (12), a first check valve (13) and a first pneumatic isolation valve (14) are sequentially arranged on the first main gas-filling pipe (2); and a second pressure reducing valve (15), a second check valve (16) and a second pneumatic isolating valve (17) are sequentially arranged on the second air supplementing main pipe (7).
4. The automatic nitrogen-filling maintenance control device for the advanced large-scale container in the factory according to claim 3, wherein a first pressure difference detection pipeline (18) is arranged on the first main gas-filling pipe (2) and between the rear side of the first pressure reducing valve (12) and the first automatic gas-filling device (4), and a first pressure control switch (19) is arranged on the first pressure difference detection pipeline (18).
5. The automatic nitrogen-filling maintenance control device for the large-scale advanced factory container according to claim 3, wherein a second pressure difference detection pipeline (20) is arranged on the second main gas-filling pipe (7) and between the rear side of the second pressure reducing valve (15) and the second automatic gas-filling device (9), and a second pressure control switch (21) is arranged on the second pressure difference detection pipeline (20).
6. The automatic nitrogen-filling maintenance control device for the large-scale early-arrival container according to claim 1, further comprising a nitrogen generator (22), a first gas-filling pipe (23) and a second gas-filling pipe (24), wherein the nitrogen generator (22) is connected with the first compressed nitrogen bottle group (1) through the first gas-filling pipe (23), and the nitrogen generator (22) is connected with the second compressed nitrogen bottle group (6) through the second gas-filling pipe (24), and is capable of supplying nitrogen gas to the first compressed nitrogen bottle group (1) and the second compressed nitrogen bottle group (6).
7. The automatic nitrogen-filling maintenance control device for the large-scale advanced factory container according to claim 6, wherein a third pneumatic isolation valve (25) is arranged on the first gas filling pipe (23), and a fourth pneumatic isolation valve (26) is arranged on the second gas filling pipe (24).
8. The automatic nitrogen-filling maintenance control device for the ex-factory large-scale container according to claim 7, wherein a third pressure control switch (27) is arranged between the first compressed nitrogen cylinder group (1) and the nitrogen generator (22), the third pressure control switch (27) is capable of detecting the pressure of the first compressed nitrogen cylinder group (1), and when the detected pressure is lower than a preset value, the nitrogen generator (22) and the third pneumatic isolation valve (25) are controlled to be opened to supply gas to the first compressed nitrogen cylinder group (1).
9. The automatic nitrogen-filling maintenance control device for the advanced factory large-scale container according to claim 7, wherein a fourth pressure control switch (28) is arranged between the second compressed nitrogen bottle group (6) and the nitrogen making machine (22), the fourth pressure control switch (28) can detect the pressure of the second compressed nitrogen bottle group (6), and when the detected pressure is lower than a preset value, the nitrogen making machine (22) and the fourth pneumatic isolation valve (26) are controlled to be opened to fill the second compressed nitrogen bottle group (6).
10. The automatic nitrogen-filling maintenance control device for the pre-arrival large-scale container according to claim 1, wherein a first safety valve (29) is provided on the first compressed nitrogen cylinder group (1), and a second safety valve (30) is provided on the second compressed nitrogen cylinder group (6).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221946418.8U CN218494763U (en) | 2022-07-26 | 2022-07-26 | Automatic nitrogen filling maintenance control device for large-scale container in early arrival |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221946418.8U CN218494763U (en) | 2022-07-26 | 2022-07-26 | Automatic nitrogen filling maintenance control device for large-scale container in early arrival |
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| CN218494763U true CN218494763U (en) | 2023-02-17 |
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| CN202221946418.8U Active CN218494763U (en) | 2022-07-26 | 2022-07-26 | Automatic nitrogen filling maintenance control device for large-scale container in early arrival |
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