67 results about "Liquid nitrogen container" patented technology

The utility model provides a methane full-supercooling filling system in a liquid oxygen methane rocket filling system. The methane full-supercooling filling system comprises a liquid nitrogen container, the first heat exchanger is connected with a first liquid phase outlet of the liquid nitrogen container; an outlet of the first heat exchanger is connected with a gas phase inlet of the liquid nitrogen container; the first heat exchange device is connected with a second liquid phase outlet of the liquid nitrogen container; a methane storage tank A; the second heat exchanger is connected with a first liquid phase outlet of the methane storage tank A; an outlet of the second heat exchanger is connected with a gas phase inlet of the methane storage tank A; the first heat exchange device is connected with a second liquid phase inlet / outlet of the methane storage tank A; the methane storage tank B is connected with the first heat exchange device; and the methane adding and storing device is connected with the methane storage tank B. In a liquid oxygen methane rocket filling system, the filling system is adopted, large-flow full supercooling of methane can be effectively achieved in a backflow cooling mode, and the construction cost of the methane filling system is reduced in the backflow cooling mode.

The invention discloses a system for realizing liquid level calibration of a low-temperature liquid nitrogen biological container through pressure difference. The system comprises a liquid nitrogen container, a nitrogen filling device, an initialization module, a pressure difference measurement module, a liquid level calculation module, a processing module, a communication interface and a display terminal, after the system is initialized, nitrogen with a fixed volume is filled into the liquid nitrogen container through the nitrogen filling device, and the air pressure difference after inflation is measured and recorded; after each inflation, calculating the difference value between the volume of the liquid nitrogen container and the air pressure difference, and organizing into a pressure difference change data set; based on the data set, the liquid level calculation module calculates the relation between the actual volume of the liquid nitrogen container and the liquid level height; the processing module receives the liquid level height information and performs abnormity verification; the communication interface and the display terminal realize visual display of liquid level height information including a real-time curve, an information set and an abnormal alarm; according to the system, the liquid level change in the liquid nitrogen container is indirectly deduced by controlling the volume of filled nitrogen and monitoring the air pressure difference change, and non-contact liquid level calibration is achieved.

The invention provides an isotope separation system and an isotope separation method.The isotope separation system comprises a cryogenic temperature and pressure swing adsorption device, the cryogenic temperature and pressure swing adsorption device comprises at least two adsorber units, each adsorber unit comprises a liquid nitrogen container and an adsorber, and in each adsorber unit, the liquid nitrogen container is communicated with the adsorber; the adsorber is soaked in the liquid nitrogen in the liquid nitrogen container; the adsorber comprises a pipe wall, the material of the pipe wall comprises a first material, the constant volume heat capacity Qvh of the unit length of the pipe wall is larger than a first preset value, and the wall thickness D of the pipe wall is 0.5-8 cm; a modified Nusselt criterion # imgabs0 # related to the material and thickness of the tube wall is controlled to be within a predetermined range. The problems of low isotope separation efficiency, poor regeneration effect, high liquid nitrogen consumption and high energy consumption in the prior art are solved, and the cyclic utilization rate of the adsorbent and the heavy component isotope recovery rate are remarkably increased.

The utility model discloses a liquid nitrogen tank assembly suitable for freezing ova or embryos and a storage system of the liquid nitrogen tank assembly, relates to the technical field of assisted reproduction, and aims to solve the problems that an existing upper barrel and an existing lower barrel are embedded together, when the lower barrel is taken out, the upper barrel needs to be taken out together, and time and labor are wasted in operation. Comprising a liquid nitrogen tank body with an open end part; the upper barrel is arranged in the liquid nitrogen tank body; the lower barrel is arranged in the liquid nitrogen tank body and located under the upper barrel; one end of the upper lifting rod is connected with the upper barrel, and the other end of the upper lifting rod is hung on the opening end part; one end of the lower lifting rod is connected with the lower barrel, the other end of the lower lifting rod and the upper lifting rod are hung on the open end part in parallel, the upper lifting rod and the upper barrel form an upper lifting barrel, the lower lifting rod and the lower barrel form a lower lifting barrel, and the upper lifting barrel and the lower lifting barrel do not interfere with each other during use.

The utility model discloses a taking and storing support and a liquid nitrogen container, the taking and storing support comprises a lifting frame, a buffer piece, a flat baffle, a containing frame and a test tube frame; the buffer piece is arranged on the lifting frame; a flat baffle is arranged on the lifting frame in a sleeving mode and abuts against the buffering piece, and a guide wheel is arranged on the side, away from the lifting frame, of the flat baffle. The containing frame comprises a plurality of containing layers, and the containing layers are detachably connected in sequence from top to bottom. The test tube racks are inserted into the corresponding accommodating layers and are used for inserting cell cryopreservation tubes. According to the utility model, the accommodating rack is detachably formed by the plurality of accommodating layers from top to bottom, the test tube rack can be inserted in multiple layers, the space in the liquid nitrogen tank is reasonably utilized, protection and buffering can be provided when the test tube rack is in contact with the inner top wall of the liquid nitrogen tank during extraction through the flat baffle and the buffer piece, and the guide wheel provides sliding guide when being in contact with the inner top wall of the liquid nitrogen tank, so that the test tube rack is convenient to use. And the lifting process is more stable, and shaking is reduced.

The utility model discloses a liquid nitrogen quick-frozen microsphere screening device, and aims to improve the screening and counting efficiency in the field of biological medicine liquid nitrogen drop quick-frozen microspheres. The device comprises a liquid nitrogen container, a double-layer microsphere screening device and a microsphere counting device. The liquid nitrogen container is in an open barrel shape, the inner container is used for storing liquid nitrogen, and the shell heat preservation layer reduces heat transmission. The microsphere screening device is composed of two layers of screens with different pore diameters, the first layer is used for filtering microspheres with the diameter larger than that of the microspheres (sd is the standard deviation and the average diameter of the microspheres), the second layer is used for filtering microspheres with the diameter smaller than that of the microspheres, and the second layer of screen is designed to be inclined by 15-30 degrees so that the microspheres can move and gather conveniently. The microsphere counting device is a transparent pipeline, the number of microspheres is determined by calculating the length of the pipeline and the diameter of the microspheres, and rapid counting and split charging are achieved. The problems that in the prior art, quick-frozen microspheres in liquid nitrogen cannot be filtered and screened, and the quick-frozen microspheres cannot be counted and subpackaged are solved.

The invention discloses a liquid nitrogen container provided with a carrying rod rapid cap mounting mechanical device, and particularly relates to the technical field of manipulators or containers provided with operating devices. The liquid nitrogen container comprises a carrying rod echelon conveying mechanism and a rod cap sleeve; the carrying rod echelon conveying mechanism comprises a transmission rail, a pushing rod, a crank shifting rod and a transmission disc. An out-position sliding groove matched with the carrying rod to slide is formed in the transmission rail, one end of the pushing rod is in transmission connection with the transmission disc, and the other end of the pushing rod is in pushing transmission with the carrying rod. A cam sliding groove is formed in the transmission disc, one end of a crank shifting rod is arranged in the cam sliding groove in a sliding mode, the other end of the crank shifting rod is in transmission connection with a carrying rod on the out-of-position sliding groove, and the crank shifting rod is rotationally installed on the transmission rail. The rod cap sleeve is located below the carrying rod. The liquid nitrogen container has the advantages that an operator is assisted in positioning the loading rod and the rod cap, and batch sample loading rods can be quickly processed.

The invention discloses a Dewar flask upper end face sealing structure for a physical adsorption instrument, which comprises triangular cake structures capable of being spliced into a cylinder, each triangular cake structure is provided with an upper functional layer, a middle functional layer and a lower functional layer, the upper functional layer is a weight applying layer, the middle functional layer is an anti-leakage layer, the lower functional layer is a porous fixed supporting layer, and the sections of triangular cakes are the same. And two radiuses corresponding to the central angles of the fan-shaped structures of the upper functional layer, the middle functional layer and the lower functional layer are respectively provided with an inward semicircular gap. The blocking structure between the Dewar flask and the sample tube for the physical adsorption instrument is simple in structure, during working, low-temperature nitrogen volatilized and released from the Dewar flask condenses gas water in air in gaps into ice, the gaps are automatically filled with the ice, the periphery of the outer side of the sample tube can be blocked, loss of liquid nitrogen in a liquid nitrogen container is effectively reduced, and the service life of the sample tube is prolonged. The sustainable testing time after one-time liquid nitrogen adding is prolonged, and the testing effect is guaranteed.

The invention relates to the technical field of liquefaction storage, aims to solve the problems of low liquefaction efficiency, bottleneck of heat insulation performance and low space utilization rate in the prior art, and provides a high-vacuum heat insulation type gas low-temperature liquefaction storage multi-layer container which comprises an outer-layer vacuum heat insulation layer, a middle liquid nitrogen container layer and an inner-layer container which are sequentially arranged from outside to inside, a hoisting structure is arranged at the outer top end of the inner-layer container, the end, away from the inner-layer container, of the hoisting structure sequentially penetrates through the middle liquid nitrogen container layer and the outer-layer vacuum heat insulation layer, and the joints of the outer-layer vacuum heat insulation layer, the middle liquid nitrogen container layer and the hoisting structure are mutually connected in a sealed mode. A spiral heat exchange coil immersed in liquid nitrogen is arranged on the outer top of the inner-layer container, an inlet of the spiral heat exchange coil is connected with an air inlet connecting pipe, the air inlet connecting pipe sequentially penetrates through the middle liquid nitrogen container layer and the outer-layer vacuum heat insulation layer, and an outlet of the spiral heat exchange coil is communicated with the inner-layer container. The invention has the beneficial effects of high liquefaction efficiency, optimized heat insulation performance, enhanced safety, compact structure and small occupied area.

The present invention relates to the field of launch vehicles and provides a detection system for a tank and an engine frame. The system comprises: a liquid nitrogen filling and discharging mechanism comprising a filling pipe and a liquid nitrogen container, the filling pipe being used to connect the tank and the liquid nitrogen container; a pressurizing mechanism comprising a pressurizing air pipe being connected to the tank; a thrust loading mechanism located at the bottom of the engine frame and being used to apply thrust to the center of the engine frame; and a collection mechanism comprising a temperature detecting element and a strain detecting element, the temperature detecting element and the strain detecting element being provided on the surface of the tank and the engine frame, respectively, for detecting the surface temperature and strain of the tank and the surface temperature and strain of the engine frame, thereby realizing multiple performance detection of the tank.

The utility model discloses a movable lifting operation cabin which comprises an operation cabin body, a movable lifting mechanism and a track. An operation cabin is arranged on the movable lifting mechanism, the track is connected with the movable lifting mechanism, the movable lifting mechanism drives the operation cabin to slide on the track and drives the operation cabin to ascend and descend, and the operation cabin is in butt joint with the liquid nitrogen tanks. The lifting mechanism has the advantages that the lifting assembly pushes the operation cabin to vertically ascend and descend in the vertical direction, the direction of pushing force is consistent with the movement direction of the operation cabin, the direction of acting force is more accurate, and more labor is saved; a set of lifting shaft and a gripper assembly are arranged in the operation cabin, the double-cabin liquid nitrogen tank can be stored and taken out through the lifting shaft assembly and the gripper assembly, and compared with the design that in the prior art, liquid nitrogen tanks on the two sides are each provided with a set of storing and taking mechanism, mechanisms in the operation cabin are saved, and meanwhile the mass of the operation cabin can be reduced; the cover moving assembly can be used for opening the cover of the liquid nitrogen container through magnet attraction, and complex cover moving operation is omitted.

The utility model relates to the technical field of liquid nitrogen containers, in particular to a liquid nitrogen container protective cover with a locking structure, which comprises a lower cover body, a lower cover body and a locking structure, the upper cover body is rotationally mounted on the lower cover body; the locking part is arranged between the upper cover body and the lower cover body and is used for keeping the upper cover body locked; according to the liquid nitrogen tank protection cover with the locking structure, a heat preservation protection structure can be formed outside the tank opening through the upper cover body and the lower cover body, potential safety hazards existing in the low-temperature atmosphere of the tank opening are avoided, the situation that the tank opening is accidentally touched to cause human body injuries or the cover plug is loosened due to external object touch is avoided, meanwhile, cooling atmosphere exosmosis can be reduced, and the service life of the liquid nitrogen tank is prolonged. The heat preservation effect can be improved; by arranging the locking part, the safety can be improved, a specially-assigned person can conveniently manage the sample, and the risk that the sample is damaged after mistaken opening is avoided.

The present invention relates to the technical field of mechanical property testing systems, and in particular to a mechanical property testing system used in a cryogenic environment. Its technical solution includes: a microcomputer-controlled electronic universal testing machine, and also includes: a rotary adjustment component installed on the microcomputer-controlled electronic universal testing machine, a lifting adjustment component installed on the rotary adjustment component, and a liquid nitrogen container fixedly installed on the lifting adjustment component. This comprehensive testing system has the ability to detect the mechanical properties of materials in any temperature environment within a wide temperature range from a low temperature environment of ‑196°C to a high temperature environment of +300°C. In addition to meeting conventional temperature detection tasks, it can also solve key problems such as: material simulation for use in extreme environments, material performance evaluation in a cryogenic environment, and expansion or change of material defects in an ultra-low temperature environment, saving time and cost, improving experimental accuracy, and making the test process safe, environmentally friendly and reliable.

The utility model discloses an adjustable vacuum interface valve fixing device for a liquid nitrogen container, belongs to the technical field of mechanical structures, and solves the technical problems that a vacuumizing fixing device for the liquid nitrogen container is high in cost and tedious in vacuumizing process. The fixing device comprises a left fixing ring, a right fixing ring, a fixing ring fixing screw, a connecting plate, a vacuum valve fixing plate and a vacuum interface valve fixing screw. The left fixing ring and the right fixing ring are connected and fixed through the fixing ring fixing screws, and the left fixing ring and the right fixing ring are embedded in the circumferential face of the liquid nitrogen container shell. The vacuum valve fixing plate, the connecting plate and the right fixing ring are sequentially and fixedly connected, and the vacuum connector valve and the vacuum valve fixing plate are fixedly connected through the vacuum connector valve fixing screw. The fixing device is used for fixing the vacuum interface valve when the liquid nitrogen container is vacuumized and maintained.

The utility model discloses a liquid nitrogen cryotherapy injection device, which relates to the technical field of liquid nitrogen cryotherapy and comprises a first sealing plug and a second sealing plug, and a first liquid outlet pipe is fixedly mounted at the lower end of the first sealing plug. According to the liquid nitrogen cryotherapy spraying device, through the arrangement of the spraying pipe, the pressing air bag, the second control valve and the like, the second sealing plug is installed on the liquid nitrogen tank, the second liquid outlet pipe enters the interior of the tank body, the first sealing plug is installed in a kettle opening of a heat preservation kettle, the first liquid outlet pipe extends into the heat preservation kettle, then the first control valve is closed, the second control valve is opened, and the liquid nitrogen is sprayed out. A medical worker sucks the liquid nitrogen container by pressing the pressing air bag, so that liquid nitrogen is conveyed into the protection kettle through the connecting hose, and during suction, the worker adjusts the height of the heat preservation kettle and the height of the liquid nitrogen container to form a height difference, so that the connecting hose forms a siphonic effect, the liquid nitrogen is conveniently sucked into the heat preservation kettle, convenience is improved, and the working efficiency is improved. Therefore, treatment work is facilitated.

The invention discloses a low-temperature target table for an ion beam irradiation test, which comprises a vacuum cavity, a sample table and a refrigerating system, and is characterized in that the sample table is positioned in the vacuum cavity; the refrigerating system comprises a liquid nitrogen container, a low-temperature loop and a liquid nitrogen pump, the liquid nitrogen container is located outside the vacuum cavity, the low-temperature loop penetrates through the interior of the sample table, a liquid nitrogen inlet of the low-temperature loop is detachably connected with the liquid nitrogen container, a liquid nitrogen outlet of the low-temperature loop is connected with the liquid nitrogen pump, and the liquid nitrogen pump is connected with the liquid nitrogen container to form a loop; the liquid nitrogen in the liquid nitrogen container is extracted along with the low-temperature loop, so that the liquid nitrogen cools the sample table, the sample table can be rapidly cooled, and the material radiation requirement under the low-temperature condition is met.

The utility model discloses a heat preservation box and an automatic liquid nitrogen container, the heat preservation box is used for being arranged on the automatic liquid nitrogen container, the heat preservation box comprises a box body, a box door and a temperature adjusting module, the box door is arranged on the box body in an opening and closing mode, and the temperature adjusting module is arranged in the box body; when the incubator is used, the temperature in the incubator body is low by adjusting the temperature adjusting module, and the biological tissue taken out from the automatic liquid nitrogen tank is placed in the incubator body of the incubator to be stored. The heat preservation box is arranged at the outlet of the automatic liquid nitrogen tank, and the temperature in the box body is adjusted through the temperature adjusting module, so that the biological tissue can be continuously in a low-temperature environment, and the poor preservation effect caused by repeated refrigeration of the biological tissue is avoided.

The present invention discloses a kind of ultrafine grain aluminum alloy cryogenic forging preparation device and its use method, the device comprises a liquid nitrogen refrigeration system, a cryogenic forging die assembly and a universal die base of a forging press installed on the upper and lower working platforms of a forging hydraulic press, the liquid nitrogen refrigeration system comprises a self-pressurizing liquid nitrogen container and a cryogenic control system, the self-pressurizing liquid nitrogen container is connected with the cryogenic control system through two-way liquid nitrogen pipelines, a liquid nitrogen cooling channel is provided in the cryogenic forging die assembly, the terminals of the two-way liquid nitrogen pipelines are respectively connected with the liquid nitrogen cooling channel in a cryogenic forging die assembly, and the cryogenic control system can automatically adjust the liquid nitrogen flow rate according to the temperature feedback of the die. The present invention has the characteristics of large refrigeration temperature range, high cooling efficiency, green and pollution-free, can realize near-isothermal forging at any temperature within the range of 0℃~-160℃, can significantly improve the accuracy and standardization degree of forging processing and experimental process parameters, and realize high-quality, multi-specification and low-cost preparation of ultrafine grain aluminum alloy.

The invention relates to the technical field of liquid nitrogen tank storage, and discloses a storage device for a reproductive medicine embryo liquid nitrogen tank, the storage device comprises a cylinder and a rotating shaft, a motor is arranged in the cylinder, and an output shaft of the motor is coaxially connected with the rotating shaft; a plurality of placing mechanisms are arranged on the circular shaft at equal intervals in the circumferential direction, each placing mechanism comprises a fixed plate and a lifting block, the fixed plate is fixedly connected with the circular shaft, a plurality of placing parts are vertically arranged on the fixed plate at equal intervals, each placing part comprises a side plate fixedly connected with the fixed plate and inclined grooves formed in the fixed plate and located in the two sides of the lifting block, and the lifting block is vertically and slidably connected with the side plates at the same time; an auxiliary block is slidably connected into the inclined groove, and a clamping arm is arranged on the auxiliary block; an opening and an arc-shaped groove are formed in the side wall of the cylinder, and a sealing plate used for sealing the opening is slidably connected into the arc-shaped groove. And the adjusting mechanism is used for adjusting the distance between the two clamping arms on each side plate along with the vertical movement of the lifting block. According to the scheme, the problem that an existing storage device is tedious in operation in the storage mode of the reproductive medicine embryo liquid nitrogen container is mainly solved.

1. Name of the Design Product: Large-caliber Liquid Nitrogen Container. 2. Use of the Design Product: The large-caliber liquid nitrogen container is an essential instrument in biochemistry and molecular biology laboratories. As a specialized product in the biomedical field for low-temperature storage, its storage temperature range covers -196°C to -135°C, and it is used for long-term or temporary low-temperature storage of biological samples, blood products, vaccines, drugs, test reagents, etc. By controlling the temperature, the biochemical reactions in the stored samples are reduced, ensuring the biological molecules and cell activity of the samples. Large-caliber liquid nitrogen containers are widely used in institutions such as biological research, metal processing, hospitals, epidemic prevention systems, testing centers, and biopharmaceutical companies. 3. Design Key Points of the Design Product: Lies in the shape. 4. Picture or Photo that Best Illustrates the Design Key Points: Perspective view.

Exemplary embodiments disclosed herein are directed to systems and methods by which the contents of a container, such as the level of liquid nitrogen in one or more liquid nitrogen storage containers, can be locally and / or remotely monitored, and alerts can be generated if a leak is detected. The weight of the container, or a combination of the weight and the temperature of the container, may be monitored with respect to detecting a leak.

The utility model discloses an integrated bottle stopper for a liquid nitrogen container, belonging to the technical field of cryogenic preservation equipment, comprising a fixed cover and an elastic sealing plug for sealing the liquid nitrogen container fixed to the bottom of the fixed cover, an outer wall of one side of the fixed cover is rotatably connected with an adjusting column, an end face of the adjusting column is fixed with an active bevel gear, a bottom wall of the inner cavity of the elastic sealing plug is provided with a support plate, and the surface of the support plate is fixed with two fixed columns fixedly connected with the fixed cover, a supporting airbag is movably connected to the outside of the fixed column, a lifting screw is rotatably connected in the bottom plate of the fixed cover, a driven bevel gear meshing with the active bevel gear is fixed to the top of the lifting screw, a lifting sleeve is threadedly connected to the outer wall of the lifting screw, and a pressure plate is fixed to the bottom of the lifting sleeve. The integrated bottle stopper for the liquid nitrogen container is not only easy to open, but also can seal liquid nitrogen containers of different diameters, and has a wider range of applications.

The application discloses a waveguide cold noise source and a temperature control method, and solves the problems of unstable output temperature of a waveguide cold noise source, easy leakage of liquid nitrogen and difficulty in replacing a matching load in the prior art. The waveguide cold noise source comprises a sealed liquid nitrogen container, a heat transfer structure, a waveguide mounting rack, a waveguide, a load and a temperature control structure. The waveguide mounting rack is fixedly connected with the liquid nitrogen container through the heat transfer structure. The waveguide is a hollow pipeline installed in a through groove of the waveguide mounting rack. The load is located in a waveguide cavity. The temperature control structure comprises a heating film, a temperature sensor and a PID controller which are located between the liquid nitrogen container and the waveguide mounting rack. The temperature sensor is distributedly installed in the waveguide and measures the physical temperature of the load and feeds back to the PID controller. The PID controller adjusts the heating film according to the physical temperature feedback of the load and controls the working temperature of the load. The device of the application adjusts the physical temperature of the load in an interval and avoids the problems of liquid nitrogen leakage, standing wave deterioration and spectrum expansion difficulty.

The utility model discloses a sample storage tank which comprises a liquid nitrogen tank body, a storage mechanism is arranged in the liquid nitrogen tank body, at least two stages of lifting baskets can be stored in the storage mechanism, the storage mechanism can drive a plurality of sets of lifting baskets to rotate, a lifting basket guiding assembly is arranged on the storage mechanism, and the lifting basket guiding assembly can conduct guiding protection on the lifting baskets. The liquid nitrogen container has the advantages that the storage mechanism is arranged in the liquid nitrogen container body, two-stage storage of the lifting baskets can be achieved through the storage mechanism, the storage capacity can be improved by arranging a plurality of storage areas, the lifting baskets can be conveniently and rapidly lifted by matching the storage mechanism with the lifting channel in a rotating mode, and the liquid nitrogen container is large in storage capacity and convenient to use. A good heat preservation function is also realized.

1. The name of this design product: Mobile boom lift. 2. Purpose of this design product: It is a supporting product for large-caliber liquid nitrogen containers, mainly used for extracting and storing freezing racks, so that a single person can easily complete the extraction and storage of freezing racks. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the design points: Stereoscopic drawing 1.

The utility model relates to the technical field of liquid nitrogen tank transportation, in particular to a liquid nitrogen tank carrying device which comprises a rectangular supporting bottom frame, an L-shaped rotating piece and a jack arranged at the rear end of the rectangular supporting bottom frame. A supporting hook is arranged at the movable end of the jack and used for hooking a handrail ring of the liquid nitrogen tank. An opening for accommodating a liquid nitrogen tank is formed in the front end of the rectangular supporting bottom frame; the lower portion of the liquid nitrogen tank pushes the L-shaped rotating part to rotate, the lower portion of the liquid nitrogen tank enters the opening, the first right-angle side of the L-shaped rotating part seals the opening and abuts against the liquid nitrogen tank, and the second right-angle side of the L-shaped rotating part is fixed to the side edge of the opening. The liquid nitrogen container has the advantages that the liquid nitrogen container can be separated from the ground under the action of the jack, so that the liquid nitrogen container is suspended above the ground, meanwhile, the L-shaped rotating part locks the lower portion of the liquid nitrogen container, the upper portion and the lower portion of the liquid nitrogen container are supported, the liquid nitrogen container is prevented from shaking in the transportation process, and safety is guaranteed.

The utility model discloses a liquid nitrogen container convenient for storing and taking samples, which relates to the technical field of liquid nitrogen containers and comprises a container body and a container cover, a lifting component is arranged between the container body and the container cover, a rotating seat for placing a sample box is arranged at the lower end of the container body, a sampling port is arranged at the upper end of the container cover, and a sealing cover is arranged on one side of the sampling port. A sample storing and taking assembly is arranged on the other side of the sampling opening. Through mutual cooperation of the lifting assembly and the rotating seat arranged between the tank body and the tank cover, the sampling opening formed in the tank cover, the sealing cover and the sample storing and taking assembly, the problems that a cryopreservation box containing samples needs to be manually placed in the liquid nitrogen tank, efficiency is low, and the sample storing and taking effect is poor are solved. And in the storing and taking-out process, workers have the frostbite risk.

A liquid nitrogen tank airtight weight loss rate detection system based on a weighing device comprises a body and a temperature sensor, and is further provided with a selection unit, a weight acquisition unit, a temperature acquisition unit, a data analysis and calculation unit, a timing unit, a display unit and a setting unit. The signal output end of the temperature sensor is electrically connected with the signal input end of a main control module in the weighing device; the selection unit, the weight acquisition unit, the temperature acquisition unit, the data analysis and calculation unit, the timing unit, the display unit and the setting unit are application software installed in the main control module; the application method of the liquid nitrogen tank airtightness weight loss rate detection system based on the weighing device comprises five steps. The liquid nitrogen weighing device is relatively low in cost and convenient to use, weight data of liquid nitrogen in the liquid nitrogen container and the liquid nitrogen in the liquid nitrogen container can be given at the corresponding environment temperature and the corresponding time period under the action of related software and corresponding processes in the weighing device, whether current leakage data exceed normal values or not can be judged, and powerful technical support is provided for effective use of the liquid nitrogen container.

The utility model relates to the technical field of biological sample storage, in particular to a linkage type liquid nitrogen container which comprises a liquid nitrogen container body, a container cover and a storing and taking mechanism, and the storing and taking mechanism comprises a mounting frame, an electric push rod, a mounting base, a rotating disc, a driving assembly and a connecting arm. After the to-be-stored and taken cryopreservation frame is rotated to the bottom of the tank cover and the tank cover is opened, the electric push rod is started, the hook is driven to descend through the connecting arm, and after a user hangs the end of the hook on the hanging ring of the corresponding cryopreservation frame outside the liquid nitrogen tank body, the electric push rod is started to drive the cryopreservation frame to be stored and taken out. After the cryopreservation frame on the hook is driven by the connecting arm to ascend to the position above the liquid nitrogen tank body, the driving assembly is started, the rotating disc is driven by the driven tooth part to rotate on the mounting base, a user can store and take the cryopreservation frame outside the liquid nitrogen tank body, and by means of the structure, the user can be prevented from being hurt by the low-temperature environment.

The utility model discloses a portable liquid nitrogen tank which comprises a round base, a base is arranged in the round base, an outer tank body is arranged at the center of the top end of the base, an inner tank body is arranged in the outer tank body, a supporting seat is arranged at the center of the bottom end of the inner tank body, and the bottom end of the supporting seat is fixedly connected with the bottom of the outer tank body. The outer wall of the outer tank body is filled with aerogel, the outer wall of the aerogel is connected with the inner wall of the outer tank body, a tank cover is installed at the top end of the outer tank body, a first magnetic attraction block is arranged at the edge position of the bottom end of the tank cover, a second magnetic attraction block is arranged on the outer wall of the upper end of the inner tank body, and the top end of the second magnetic attraction block is attracted to the bottom end of the first magnetic attraction block. According to the liquid nitrogen container, the long-time heat preservation function of the liquid nitrogen container is achieved, it is guaranteed that liquid nitrogen stored in the inner container body is in a low-temperature state all the time, the convenience of the liquid nitrogen container in the using process is improved, the labor intensity of workers is reduced, and the purpose that the liquid nitrogen container is convenient to carry and transfer is achieved.