CN220397262U - Device for reducing vaporization and emptying of liquid nitrogen storage tank - Google Patents
Device for reducing vaporization and emptying of liquid nitrogen storage tank Download PDFInfo
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- CN220397262U CN220397262U CN202323422561.4U CN202323422561U CN220397262U CN 220397262 U CN220397262 U CN 220397262U CN 202323422561 U CN202323422561 U CN 202323422561U CN 220397262 U CN220397262 U CN 220397262U
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- liquid nitrogen
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- pipe
- storage tank
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 271
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 133
- 239000007788 liquid Substances 0.000 title claims abstract description 94
- 238000009834 vaporization Methods 0.000 title claims abstract description 14
- 230000008016 vaporization Effects 0.000 title claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 27
- 230000002093 peripheral effect Effects 0.000 claims abstract description 24
- 238000003780 insertion Methods 0.000 claims abstract description 19
- 230000037431 insertion Effects 0.000 claims abstract description 19
- 230000000149 penetrating effect Effects 0.000 claims description 12
- 238000004321 preservation Methods 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 5
- 238000005057 refrigeration Methods 0.000 abstract description 39
- 238000011084 recovery Methods 0.000 abstract description 9
- 238000013022 venting Methods 0.000 abstract description 6
- 238000007599 discharging Methods 0.000 description 6
- 229910001873 dinitrogen Inorganic materials 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- -1 bioengineering Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The utility model discloses a device for reducing vaporization and venting of a liquid nitrogen storage tank, and relates to the technical field of liquid nitrogen storage. The temporary storage refrigerating tank is internally and slidably clamped with a sealing sliding plate, the top of the temporary storage refrigerating tank is penetrated and welded with a first connecting pipe, and the bottom of the outer peripheral surface of the first connecting pipe is penetrated and welded with a second connecting pipe. According to the utility model, through arranging the insertion pipe and the temporary storage refrigeration tank, the problems that the liquid nitrogen storage tank is difficult to reduce the vaporization amount of nitrogen when the external environment of liquid nitrogen changes, the liquid nitrogen storage tank is connected with the recovery device through a plurality of pipelines and the like, and the leakage of nitrogen is easily caused by a plurality of connection points are solved.
Description
Technical Field
The utility model belongs to the technical field of liquid nitrogen storage, and particularly relates to a device for reducing vaporization and venting of a liquid nitrogen storage tank.
Background
The liquid nitrogen storage tank is widely applicable to the fields of scientific research, physics, medicine, bioengineering, chemical industry, food, metallurgy, petroleum, storage battery, artificial board and the like, can provide high-precision, controlled and uniform-temperature ultra-low temperature environment for users, is ideal research and development equipment for research departments such as testing and chemical analysis, higher institutions, factory laboratories and metering quality inspection departments, and in the storage process of liquid nitrogen, liquid nitrogen is influenced by factors such as external environment, liquid nitrogen can be vaporized in the storage tank and the pressure in the storage tank is increased, and certain pressure is maintained in the storage tank for ensuring that the storage tank is ensured, so as to avoid safety accidents, the liquid nitrogen storage tank needs to discharge a certain amount of nitrogen through an emptying valve at regular time, but the nitrogen is emptied at regular time and quantity to cause certain waste, so that staff can purchase nitrogen recovery devices to recover nitrogen, and reduce expenses, but the liquid nitrogen storage tank still has the following defects in actual use:
1. the utility model discloses a large-scale air separation liquid nitrogen storage tank emptying nitrogen recovery device, which is characterized in that a safety valve is arranged on a pipeline, the large-scale air separation liquid nitrogen storage tank emptying nitrogen recovery device further comprises a nitrogen compressor, a liquefying device, a pneumatic film regulating valve and a one-way valve which are sequentially connected in series by the pipeline, an automatic emptying valve and a pressure detection device are further arranged on the liquid nitrogen storage tank, the pressure detection device refers to a pressure transmitter connected with an air separation device control center, the pipeline refers to a stainless steel pipe, the nitrogen recovery device can recover the emptying nitrogen and serve as protective gas, but when the liquid nitrogen storage tank is actually used, the storage tank is required to feed and discharge liquid nitrogen, temperature and pressure changes generated in the feeding and discharging process are easy to cause liquid nitrogen to be gasified, certain electricity expense is consumed for recycling the nitrogen, and the like, and the device is difficult to reduce the gasification amount of the nitrogen when the external environment changes;
2. the liquid nitrogen storage tank is usually connected with the recovery device through a plurality of pipelines, and the pipelines are sealed through devices such as welding and sealing rings to ensure the tightness of the storage tank, but the problem that nitrogen is easy to leak still exists at a plurality of connection points.
Disclosure of Invention
The utility model aims to provide a device for reducing vaporization and venting of a liquid nitrogen storage tank, which solves the problems that the device is difficult to reduce the vaporization amount of nitrogen when the external environment of liquid nitrogen changes, the liquid nitrogen storage tank is connected with the recovery device through a plurality of pipelines, a plurality of connection points are easy to cause the leakage of nitrogen though the liquid nitrogen storage tank recovers and recycles the nitrogen which is vaporized and venting through the recovery device through a cannula and a temporary storage refrigeration tank.
In order to solve the technical problems, the utility model is realized by the following technical scheme:
the utility model relates to a device for reducing vaporization and venting of a liquid nitrogen storage tank, which comprises an insertion pipe and a temporary storage refrigeration tank, wherein the top of the outer peripheral surface of the insertion pipe is penetrated and welded with a vent pipe, when liquid nitrogen is stored, the vaporized liquid nitrogen is discharged to the inner side of the temporary storage refrigeration tank through the vent pipe, when the liquid nitrogen is required to be used, the liquid nitrogen can be sucked out through the insertion pipe, the connecting pipeline required to be arranged for the liquid nitrogen storage tank is reduced, the connecting point is further reduced, the nitrogen leakage probability is reduced, the temporary storage tank is arranged on one side of the insertion pipe, a sealing slide plate is slidably clamped in the temporary storage refrigeration tank, the volume in the temporary storage refrigeration tank can be adjusted through sliding the sealing slide plate up and down, the pressure in the liquid nitrogen storage tank is further adjusted, the vaporized nitrogen is stored, the nitrogen can be liquefied in a mode of reducing the space, a first connecting pipe is penetrated and welded at the top of the temporary storage tank, a second connecting pipe is penetrated and welded at the bottom of the outer peripheral surface of the temporary storage tank, the liquid nitrogen required to be temporarily stored through the first connecting pipe, and the liquid nitrogen in the temporary storage tank can be reduced, and the liquid nitrogen required to be used is temporarily stored through the temporary storage tank, and the second connecting pipe is further reduced, the external storage tank is reduced, and the probability is reduced, and the external storage tank is influenced.
Further, a connecting plate is welded at the top of the insertion pipe in a penetrating manner, a heat preservation pipe is welded at the top of the connecting plate in a penetrating manner, a first barometer is clamped at the periphery of the heat preservation pipe in a penetrating manner, and the insertion pipe is communicated with the heat preservation pipe in a penetrating manner;
when the cannula is installed, the cannula is inserted into the bottom in the storage tank and sealed through the connecting plate, and the feeding, vaporization and discharging of the storage tank can be performed through the cannula, so that the problems that a plurality of connecting points exist in a plurality of pipelines, and nitrogen is easy to leak are solved.
Further, the top of the temporary storage refrigeration tank is fixedly clamped with a high-pressure pump, one end of the high-pressure pump is penetrated and clamped with a third connecting pipe, the other end of the third connecting pipe is penetrated and clamped at the top of the temporary storage refrigeration tank, the peripheral surface of the third connecting pipe is penetrated and clamped with a third electromagnetic valve, and the heat preservation pipe is penetrated and clamped at one end of the peripheral surface of the high-pressure pump relative to the other end of the insertion pipe;
when the discharging of liquid nitrogen is needed, a certain amount of liquid nitrogen in the storage tank can be pumped into the temporary storage refrigerating tank through the high-pressure pump, the liquid nitrogen is extruded out through upward movement of the sealing sliding plate, the automation degree of the device is improved, the heat preservation pipe can preserve heat of the liquid nitrogen, and the liquid nitrogen is prevented from being greatly affected and vaporized during discharging of the liquid nitrogen.
Further, the outer peripheral surface of the temporary storage refrigeration tank is penetrated and clamped with a second barometer, the bottom of the sealing slide plate is slidably clamped with a hydraulic cylinder, and the hydraulic cylinder is clamped with the inner bottom of the temporary storage refrigeration tank;
can drive the reciprocating of sealed slide through the pneumatic cylinder, when carrying out the blowdown of nitrogen gas, the pneumatic cylinder drives sealed slide upward movement until keeping in the interior atmospheric pressure of cold storage tank and the interior atmospheric pressure of storage tank the same, open the third solenoid valve, and drive sealed slide and slowly move downwards, can hold the volume of nitrogen gas and slowly adjust the interior atmospheric pressure of keeping in the cold storage tank through the adjustment of keeping in the cold storage tank, and make the nitrogen gas that emptys get into keeping in the cold storage tank, reduce the liquid nitrogen storage tank when carrying out the nitrogen gas blowdown, because the difference of environment leads to nitrogen gas fast vaporization, reduce the expense.
Further, the outer peripheral surface of the first connecting pipe is penetrated and clamped with a first electromagnetic valve, the outer peripheral surface of the second connecting pipe is penetrated and clamped with a second electromagnetic valve, and the second connecting pipe is positioned between the first electromagnetic valve and the temporary storage refrigeration tank;
the temporary storage refrigeration tank can refrigerate the inner side of the temporary storage refrigeration tank, so that the environmental change of liquid nitrogen is small when the liquid nitrogen enters the temporary storage refrigeration tank through the storage tank, and the nitrogen can be pressurized through upward movement of the sealing slide plate, so that partial nitrogen is liquefied, when liquid nitrogen is fed and discharged, the liquid nitrogen enters the temporary storage refrigeration tank through the first connecting pipe, the liquid nitrogen is pressed into the storage tank through upward movement of the sealing slide plate, the liquid nitrogen is prevented from being directly connected with the storage tank through the pipeline and discharged, and the liquid nitrogen is easily influenced by external environment in the feeding and discharging process.
The utility model has the following beneficial effects:
1. according to the utility model, through arranging the insertion pipe and the temporary storage refrigeration tank, the problem that the device is difficult to reduce the vaporization amount of nitrogen when the external environment changes is solved, when the nitrogen is fed, discharged and emptied, the position of the sealing slide plate is regulated through the hydraulic cylinder, the pressure inside the temporary storage refrigeration tank is further regulated to be basically consistent with the pressure inside the temporary storage refrigeration tank, the temperature of the temporary storage refrigeration tank is regulated, the liquid nitrogen in the temporary storage refrigeration tank is pumped into the temporary storage refrigeration tank through regulating the position of the sealing slide plate, the vaporized nitrogen is discharged or the liquid nitrogen inside the temporary storage refrigeration tank is poured into the temporary storage tank, and the large vaporization amount of the liquid nitrogen caused by the large difference between the contact environment and the internal environment of the temporary storage tank when the liquid nitrogen is fed and discharged is avoided.
2. According to the utility model, through arranging the insertion pipe and the temporary storage refrigeration tank, the problem that the liquid nitrogen storage tank is usually connected with the recovery device through a plurality of pipelines, the pipelines are sealed through the devices such as welding and sealing rings to ensure the tightness of the storage tank, but the problem that nitrogen is easy to leak still exists at a plurality of connection points is solved, the insertion pipe can absorb the liquid nitrogen when discharging the liquid nitrogen, the ventilation pipe can discharge the nitrogen when emptying, the connecting pipelines on the surface of the liquid nitrogen storage tank are reduced, the connection points are further reduced, and the probability of nitrogen leakage is reduced.
Drawings
FIG. 1 is a structural effect diagram of the present utility model;
FIG. 2 is a block diagram of a cannula according to the present utility model;
FIG. 3 is a block diagram of a temporary storage refrigeration tank of the present utility model;
fig. 4 is a cross-sectional view of a temporary storage refrigeration pot according to the present utility model.
Reference numerals:
1. a cannula; 101. a heat preservation pipe; 102. a vent pipe; 103. a connecting plate; 104. a first barometer; 2. temporary storage and refrigeration tanks; 201. a high pressure pump; 202. a first connection pipe; 203. a second barometer; 204. a second connection pipe; 205. a first electromagnetic valve; 206. a second electromagnetic valve; 207. a third connection pipe; 208. a third electromagnetic valve; 209. a hydraulic cylinder; 210. and a sealing slide plate.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.
Referring to fig. 1-4, the utility model discloses a device for reducing vaporization and venting of a liquid nitrogen storage tank, which comprises a cannula 1 and a temporary storage tank 2, wherein a vent pipe 102 is penetrated and welded at the top of the outer peripheral surface of the cannula 1, when liquid nitrogen is stored, the vaporized liquid nitrogen is discharged to the inner side of the temporary storage tank 2 through the vent pipe 102 and further processed, when liquid nitrogen is needed to be used, the liquid nitrogen is sucked to the inner side of the temporary storage tank 2 through the cannula 1 and then discharged through the temporary storage tank 2, the temporary storage tank 2 is arranged at one side of the cannula 1, a sealing slide plate 210 is clamped in the temporary storage tank 2 in a sliding manner, when the liquid nitrogen storage tank is fed and discharged or vented, the pressure in the temporary storage tank 2 is basically consistent with that in the storage tank, then liquid nitrogen or nitrogen is pumped into the temporary storage tank 2, or the liquid nitrogen is pumped into the temporary storage tank 2 from the temporary storage tank through the vent pipe 102, a first connecting pipe 202 is penetrated and welded at the bottom of the outer peripheral surface of the temporary storage tank 202, a second connecting pipe 204 is penetrated and pumped into the temporary storage tank 2 through the first connecting pipe 202, and then discharged through the sealing slide plate 204 and then discharged through the temporary storage tank 2, and finally discharged through the sealing slide plate 204 is pressed upwards.
As shown in fig. 1-2, a connecting plate 103 is welded at the top of the insertion tube 1 in a penetrating manner, a heat preservation pipe 101 is welded at the top of the connecting plate 103 in a penetrating manner, a first barometer 104 is clamped at the outer peripheral surface of the heat preservation pipe 101 in a penetrating manner, and the insertion tube 1 is communicated with the heat preservation pipe 101 in a penetrating manner;
when the cannula 1 is installed, the cannula 1 is inserted into the bottom of the liquid nitrogen storage tank and is sealed through the connecting plate 103, when liquid nitrogen is discharged, liquid nitrogen is pumped into the temporary storage refrigeration tank 2 through the cannula 1, when the liquid nitrogen is discharged, nitrogen enters the temporary storage refrigeration tank 2 through the vent pipe 102, and when liquid nitrogen is fed, liquid nitrogen is poured into the storage tank through the cannula 1 and the vent pipe 102.
As shown in fig. 1, 3 and 4, the top of the temporary storage refrigeration tank 2 is fixedly clamped with a high-pressure pump 201, one end of the high-pressure pump 201 is in through-clamping connection with a third connecting pipe 207, the other end of the third connecting pipe 207 is in through-clamping connection with the top of the temporary storage refrigeration tank 2, the outer peripheral surface of the third connecting pipe 207 is in through-clamping connection with a third electromagnetic valve 208, the heat insulation pipe 101 is in through-clamping connection with one end of the outer peripheral surface of the high-pressure pump 201 relative to the other end of the insertion pipe 1, the outer peripheral surface of the temporary storage refrigeration tank 2 is in through-clamping connection with a second barometer 203, the bottom of the sealing slide 210 is in sliding clamping connection with a hydraulic cylinder 209, the hydraulic cylinder 209 is in clamping connection with the inner bottom of the temporary storage refrigeration tank 2, the outer peripheral surface of the first connecting pipe 202 is in through-clamping connection with a first electromagnetic valve 205, the outer peripheral surface of the second connecting pipe 204 is in through-clamping connection with a second electromagnetic valve 206, and the second connecting pipe 204 is positioned between the first electromagnetic valve 205 and the temporary storage refrigeration tank 2;
when liquid nitrogen is fed, the first electromagnetic valve 205 is opened and is fed through the first connecting pipe 202, the hydraulic cylinder 209 drives the sealing slide plate 210 to move downwards, after liquid nitrogen feeding is completed, the first electromagnetic valve 205 is closed, the third electromagnetic valve 208 is opened, liquid nitrogen is pressed into a liquid nitrogen storage tank through upward movement of the sealing slide plate 210, when liquid nitrogen is discharged, the position of the sealing slide plate 210 is adjusted to enable the pressure in the temporary storage refrigeration tank 2 and the pressure in the storage tank to be basically consistent, the third electromagnetic valve 208 is opened, the sealing slide plate 210 is controlled to move downwards slowly, nitrogen is discharged into the temporary storage refrigeration tank 2 until the pressure is recovered to a normal value, the third electromagnetic valve 208 is closed to store the nitrogen in the temporary storage refrigeration tank 2, when the nitrogen is required to be used, the second electromagnetic valve 206 is opened again to process the discharged nitrogen, when the liquid nitrogen is required to be discharged, a certain amount of liquid nitrogen in the storage tank is pumped into the temporary storage tank 2 through the insertion pipe 1 by the high-pressure pump 201, the third electromagnetic valve 208 is closed, the second electromagnetic valve 206 is opened, and the upward movement of the sealing slide plate 210 is pressed out of the liquid nitrogen through the second connecting pipe 204.
The specific working principle of the utility model is as follows: when the insertion pipe 1 is installed, the insertion pipe 1 is inserted into the bottom of the liquid nitrogen storage tank and sealed through a butt joint opening of the connecting plate 103, when liquid nitrogen is fed, the temporary storage refrigeration tank 2 is controlled to refrigerate until the temperature is proper, the first electromagnetic valve 205 is opened and is fed through the first connecting pipe 202, meanwhile, the hydraulic cylinder 209 drives the sealing slide plate 210 to move downwards, after the liquid nitrogen is fed, the first electromagnetic valve 205 is closed and the third electromagnetic valve 208 is opened, liquid nitrogen is pressed into the liquid nitrogen storage tank through the upward movement of the sealing slide plate 210, when the liquid nitrogen is discharged, the position of the sealing slide plate 210 is adjusted to enable the pressure of the temporary storage refrigeration tank 2 to be basically consistent with that of the storage tank, the third electromagnetic valve 208 is opened again, the sealing slide plate 210 is controlled to move downwards slowly, so that nitrogen enters the temporary storage refrigeration tank 2 through the vent pipe 102 and the heat preservation pipe 101 until the pressure is recovered to be normal value, the third electromagnetic valve 208 is closed to store the nitrogen in the temporary storage tank 2, when the nitrogen is required to be used, the second electromagnetic valve 206 is opened to treat the discharged nitrogen, when the liquid nitrogen is required to be discharged, the third electromagnetic valve 208 is opened, a certain amount of liquid nitrogen is pressed into the liquid nitrogen storage tank through the sealing slide plate 201 through the pipe 1, and the second electromagnetic valve 208 is closed, and the second electromagnetic valve 204 is moved upwards.
The foregoing is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, and any modification, equivalent replacement, and improvement of some of the technical features described in the foregoing embodiments are all within the scope of the present utility model.
Claims (5)
1. The utility model provides a reduce device of liquid nitrogen storage tank vaporization blowdown, includes intubate (1) and temporary storage refrigerating tank (2), its characterized in that: the utility model discloses a refrigerating device, including intubate (1), intubate (1) outer peripheral face top runs through the welding has breather pipe (102), intubate (1) one side is provided with temporary storage refrigerating tank (2), interior sliding joint of temporary storage refrigerating tank (2) has sealed slide (210), temporary storage refrigerating tank (2) top runs through the welding has first connecting pipe (202), first connecting pipe (202) outer peripheral face bottom runs through the welding has second connecting pipe (204).
2. A device for reducing boil-off from a liquid nitrogen reservoir as defined in claim 1, wherein: the heat-insulating pipe is characterized in that a connecting plate (103) is welded at the top of the insertion pipe (1) in a penetrating mode, a heat-insulating pipe (101) is welded at the top of the connecting plate (103) in a penetrating mode, a first barometer (104) is connected to the outer peripheral surface of the heat-insulating pipe (101) in a penetrating and clamping mode, and the insertion pipe (1) and the heat-insulating pipe (101) are communicated in a penetrating mode.
3. A device for reducing boil-off from a liquid nitrogen reservoir as defined in claim 2, wherein: the utility model discloses a high-pressure pump, including cold storage tank (2) top joint, high-pressure pump (201) are fixed with to the joint in keeping in, high-pressure pump (201) one end runs through the joint has third connecting pipe (207), the joint is run through in cold storage tank (2) top in the third connecting pipe (207) other end, the joint has third solenoid valve (208) run through in third connecting pipe (207) outer peripheral face, heat preservation pipe (101) run through joint in high-pressure pump (201) outer peripheral face one end for intubate (1) other end.
4. A device for reducing boil-off from a liquid nitrogen reservoir as defined in claim 1, wherein: the outer peripheral surface of the temporary storage refrigerating tank (2) is penetrated and clamped with a second barometer (203), the bottom of the sealing sliding plate (210) is slidably clamped with a hydraulic cylinder (209), and the hydraulic cylinder (209) is clamped with the inner bottom of the temporary storage refrigerating tank (2).
5. A device for reducing boil-off from a liquid nitrogen reservoir as defined in claim 1, wherein: the outer peripheral surface of the first connecting pipe (202) is penetrated and clamped with a first electromagnetic valve (205), the outer peripheral surface of the second connecting pipe (204) is penetrated and clamped with a second electromagnetic valve (206), and the second connecting pipe (204) is positioned between the first electromagnetic valve (205) and the temporary storage refrigerating tank (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323422561.4U CN220397262U (en) | 2023-12-15 | 2023-12-15 | Device for reducing vaporization and emptying of liquid nitrogen storage tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323422561.4U CN220397262U (en) | 2023-12-15 | 2023-12-15 | Device for reducing vaporization and emptying of liquid nitrogen storage tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220397262U true CN220397262U (en) | 2024-01-26 |
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ID=89610422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323422561.4U Active CN220397262U (en) | 2023-12-15 | 2023-12-15 | Device for reducing vaporization and emptying of liquid nitrogen storage tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220397262U (en) |
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2023
- 2023-12-15 CN CN202323422561.4U patent/CN220397262U/en active Active
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