Hand-held micro-liquid nitrogen transfer device

Abstract

The utility model discloses a handheld trace liquid nitrogen transfer device, including storage cylinder, the top surface of storage cylinder is installed with module box, the bottom surface of storage cylinder is installed with conical barrel, the bottom surface fixed connection of conical barrel has screw pipe, the inner top wall of conical barrel is installed with micro two -way pump, one end communication of micro two -way pump has first pipe line, and first pipe line passes through the inside of conical barrel and is linked with storage cylinder, the other end communication of micro two -way pump has second pipe line, and micro flow sensor and micro electric valve are installed on second pipe line.

Description

Technical Field

[0001] This utility model relates to the field of laboratory sample processing technology, specifically a handheld micro-liquid nitrogen transfer device. Background Technology

[0002] In laboratory sample processing, grinding of tissues and other samples often requires the use of liquid nitrogen. Currently, most laboratories face operational inconvenience and significant safety hazards when processing samples requiring only trace amounts of liquid nitrogen (such as 0.2 mL to 2 mL).

[0003] Traditional liquid nitrogen transfer methods often employ large-capacity liquid nitrogen Dewar flasks with pouring or use relatively thick tubing for transfer. This method makes it difficult to precisely control the amount of liquid nitrogen used, often resulting in waste due to over-pouring or difficult-to-manage tubing. Furthermore, the extremely low temperature of liquid nitrogen during pouring can easily cause frostbite to operators, posing a significant safety hazard.

[0004] Therefore, a handheld micro-liquid nitrogen transfer device is needed to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a handheld micro-liquid nitrogen transfer device.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a handheld micro liquid nitrogen transfer device, comprising a storage cylinder, a module box mounted on the top surface of the storage cylinder, a conical cylinder mounted on the bottom surface of the storage cylinder, a threaded pipe fixedly connected to the bottom surface of the conical cylinder, a micro bidirectional pump mounted on the inner top wall of the conical cylinder, one end of the micro bidirectional pump being connected to a first pipe, the first pipe passing through the interior of the conical cylinder and communicating with the storage cylinder, and the other end of the micro bidirectional pump being connected to a second pipe, on which a micro flow sensor and a micro electric valve are mounted.

[0007] Preferably, in the above-mentioned handheld micro-liquid nitrogen transfer device, a battery module is installed on the inner bottom wall of the module box, and a charging module is installed on the outer surface of the module box to provide power to the device and support charging of the battery module.

[0008] Preferably, in the above-described handheld micro-liquid nitrogen transfer device, the outer surface of the storage cylinder is equipped with an extraction switch button and a valve switch button for starting and stopping the extraction and transfer process of liquid nitrogen.

[0009] Preferably, in the above-described handheld micro-liquid nitrogen transfer device, the top surface of the module box is equipped with a display screen for displaying the device's operating status, the amount of liquid nitrogen transferred, and battery power information.

[0010] Preferably, in the above-described handheld micro-liquid nitrogen transfer device, the outer surface of the storage cylinder is fitted with an anti-slip sleeve to provide an anti-slip function when gripping.

[0011] Preferably, in the above-mentioned handheld micro-liquid nitrogen transfer device, a transfer head is threadedly connected to the threaded tube, and the bottom end of the second pipeline passes through the interior of the threaded tube and communicates with the transfer head.

[0012] Preferably, in the above-mentioned handheld micro-liquid nitrogen transfer device, a capillary extraction pipe is connected to the threaded tube, and the bottom end of the second pipe passes through the interior of the threaded tube and is connected to the capillary extraction pipe.

[0013] The beneficial effects of this invention are as follows: the intake and discharge of liquid nitrogen are controlled by switching between forward and reverse rotation of a micro bidirectional pump; a flow monitoring and closed-loop control system is constructed using a micro flow sensor and a micro electric valve, which can accurately control the amount of liquid nitrogen used, effectively avoiding waste caused by excessive pouring or difficult pipeline operation, while reducing the safety hazard of frostbite to operators caused by the low temperature of liquid nitrogen, meeting the laboratory's need for 0.2mL-2mL of trace liquid nitrogen, and has the advantages of accurate dosage, easy operation and high safety. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0015] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0016] Figure 3 This is a schematic diagram of the structure of this utility model after the capillary extraction pipe has been replaced.

[0017] The attached diagram lists the components represented by each number as follows:

[0018] 1. Storage cylinder, 2. Module box, 3. Conical cylinder, 4. Threaded pipe, 5. Transfer head, 6. Anti-slip sleeve, 7. Pull-out switch button, 8. Valve switch button, 9. Display screen, 10. Battery module, 11. Charging module, 12. Human-machine interaction module, 13. Control module, 14. Miniature bidirectional pump, 15. First pipeline, 16. Second pipeline, 17. Miniature flow sensor, 18. Miniature electric valve, 19. Capillary extraction pipeline. Detailed Implementation

[0019] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0020] like Figures 1-3As shown, a handheld micro-liquid nitrogen transfer device includes a storage cylinder 1, a module box 2 mounted on the top surface of the storage cylinder 1, and a conical cylinder 3 mounted on the bottom surface of the storage cylinder 1. A threaded tube 4 is fixedly connected to the bottom surface of the conical cylinder 3, and a transfer head 5 is threaded onto the threaded tube 4. A miniature bidirectional pump 14 is installed on the inner top wall of the conical cylinder 3. One end of the miniature bidirectional pump 14 is connected to a first pipe 15, which passes through the interior of the conical cylinder 3 and connects to the storage cylinder 1; the other end of the miniature bidirectional pump 14 is connected to a second pipe 16, the bottom end of which passes through the interior of the threaded tube 4 and connects to the transfer head 5. A miniature flow sensor 17 and a miniature electric valve 18 are installed on the second pipe 16 to control the flow rate and direction of the liquid nitrogen, achieving precise volume taking and transfer of liquid nitrogen. The forward and reverse rotation of the miniature bidirectional pump 14 switches the intake and discharge of liquid nitrogen to meet the micro-liquid nitrogen usage requirements in different experimental scenarios. The module box 2 is equipped with a human-machine interface module 12 and a control module 13, which are used to receive instructions from operators, display equipment status, and control the entire transfer process.

[0021] The storage cylinder 1 stores liquid nitrogen and features a double-layered heat-insulating structure to prevent harm to operators from cryogenic liquid nitrogen. The outer wall of the threaded tube 4 has standard threads for threaded connection with the transfer head 5, allowing for quick replacement of different functional components through a detachable connection. The transfer head 5 is the terminal component for liquid nitrogen transfer. In typical transfer scenarios, installing the transfer head 5 meets the discharge requirements for general trace amounts of liquid nitrogen. Its diameter design matches the equipment's flow control, enabling precise transfer of 0.2mL-2mL liquid nitrogen through the coordinated action of the miniature bidirectional pump 14 and the miniature electric valve 18. When extraction operations are required, it can be disassembled and replaced with a capillary extraction tube 19 to adapt to different experimental needs.

[0022] The human-machine interface module 12, installed inside module box 2, is the core component for information interaction between the operator and the equipment. This module receives commands input by the operator, such as preset target transfer amounts and selection of working modes, and transmits these commands to the control module 13 for processing. Simultaneously, it also transmits equipment status information fed back from the control module 13 to the display screen 9 for display, realizing two-way information interaction between the operator and the equipment, making equipment operation more intelligent and user-friendly.

[0023] The control module 13, located inside module box 2, is the control center of the equipment and is connected to various electronic components via circuitry. It integrates a microprocessor and control program, receiving instructions from the human-machine interface module 12 and, in conjunction with flow data from the micro flow sensor 17, coordinating the forward and reverse rotation of the micro bidirectional pump 14, the opening and closing of the micro electric valve 18, and the information display on the screen 9. The control module 13 provides full-process control of the liquid nitrogen transfer process, ensuring that all components of the equipment work collaboratively to achieve accurate measurement and safe transfer.

[0024] A miniature bidirectional pump 14 is installed on the inner top wall of the conical cylinder 3 and is connected to the storage cylinder 1 and the transfer head 5 via a first pipe 15 and a second pipe 16, respectively. The pump can switch between forward and reverse rotation to achieve the functions of liquid nitrogen intake and discharge. When rotating forward, liquid nitrogen is drawn into the storage cylinder 1 from the outside through the capillary extraction pipe 19; when rotating in reverse, the liquid nitrogen in the storage cylinder 1 is pushed to the transfer head 5 for discharge.

[0025] The first pipe 15 is made of cryogenic material, capable of withstanding the extremely low temperatures of liquid nitrogen without deformation or damage, ensuring unobstructed flow of liquid nitrogen during intake and exhaust. Its pipe diameter is designed to match the flow rate of the miniature bidirectional pump 14, reducing fluid resistance and improving the efficiency of liquid nitrogen transfer while ensuring accurate flow control.

[0026] A miniature flow sensor 17 is installed on the outer surface of the second pipe 16 to monitor the flow rate of liquid nitrogen flowing through the second pipe 16 in real time. The sensor converts the flow data into an electrical signal and transmits it to the control module 13 for processing and calculation. Based on the received flow data, the control module 13 monitors the amount of liquid nitrogen transferred in real time. When a preset value is reached, it promptly issues a command to close the miniature electric valve 18 and the miniature bidirectional pump 14, achieving precise control of the liquid nitrogen transfer and preventing waste. The miniature electric valve 18 is installed on the outer surface of the second pipe 16, located below the miniature flow sensor 17, and is controlled by the command of the control module 13.

[0027] A battery module 10 is installed on the inner bottom wall of module box 2. The battery module 10 provides power to the electronic components of the equipment. The charging module 11 supports charging the battery module 10 via an external power source. The charging module 11 is installed on the outer surface of module box 2 and supports charging the battery module 10. The outer surface of storage cylinder 1 is equipped with an extraction switch button 7 and a valve switch button 8 for starting and stopping the extraction and transfer process of liquid nitrogen. A display screen 9 is installed on the top surface of module box 2 to display the operating status of the equipment, the amount of liquid nitrogen transferred, and battery power information. The outer surface of storage cylinder 1 is equipped with an anti-slip sleeve 6 to provide anti-slip function when gripping. By removing the transfer head 5 and installing the capillary extraction pipe 19, it is used for the extraction of small amounts of liquid nitrogen.

[0028] The anti-slip sleeve 6 is made of a material with elastic and wear-resistant properties. By closely fitting the outer wall of the storage cylinder 1, it provides a comfortable grip for the operator. The extraction switch button 7 is a trigger device that controls the liquid nitrogen extraction process. When the operator presses the extraction switch button 7, a signal is transmitted to the control module 13, driving the micro bidirectional pump 14 to rotate forward and simultaneously opening the micro electric valve 18, putting the equipment into liquid nitrogen extraction mode.

[0029] The capillary extraction tube 19 and replaceable transfer head 5 are mounted on the threaded tube 4 for the extraction of trace amounts of liquid nitrogen. Its narrow diameter improves the precision of liquid nitrogen extraction, meeting the need for accurate extraction of trace amounts of liquid nitrogen from 0.2 mL to 2 mL, thus ensuring accurate volume measurement.

[0030] Working principle: When a small amount of liquid nitrogen needs to be extracted, first disassemble the transfer head 5 and install the capillary extraction tube 19, utilizing its small diameter to improve extraction accuracy. After pressing the extraction switch button 7, the control module 13 drives the micro bidirectional pump 14 to rotate forward. At this time, the micro electric valve 18 remains open. The micro bidirectional pump 14 draws liquid nitrogen into the storage cylinder 1 through the capillary extraction tube 19 via the second tube 16 and the first tube 15. The small diameter design allows for precise control of the flow rate to the 0.2mL-2mL level.

[0031] Before the transfer, the capillary extraction pipe 19 needs to be disassembled and the transfer head 5 installed. The target transfer volume can be preset through the human-machine interface module 12 or the current amount in the storage tank 1 can be directly confirmed. After pressing the valve switch button 8, the control module 13 simultaneously opens the micro electric valve 18 and switches the micro bidirectional pump 14 to the reverse state. At this time, the micro bidirectional pump 14 reverses to generate thrust, pushing the liquid nitrogen in the storage tank 1 through the conical cylinder 3, the first pipe 15, the second pipe 16, and the threaded pipe 4 to the transfer head 5. During the transfer, the micro flow sensor 17 continuously monitors the flow rate of the second pipe 16. When the preset value is reached, the control module 13 automatically closes the micro electric valve 18 and stops the micro bidirectional pump 14. The display screen 9 simultaneously displays the transfer completion status and the remaining liquid nitrogen amount.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A handheld micro-liquid nitrogen transfer device, comprising a storage cylinder (1), characterized in that: The top surface of the storage cylinder (1) is equipped with a module box (2), the bottom surface of the storage cylinder (1) is equipped with a conical cylinder (3), the bottom surface of the conical cylinder (3) is fixedly connected with a threaded pipe (4), the inner top wall of the conical cylinder (3) is equipped with a miniature bidirectional pump (14), one end of the miniature bidirectional pump (14) is connected to a first pipe (15), the first pipe (15) passes through the inside of the conical cylinder (3) and is connected to the storage cylinder (1), the other end of the miniature bidirectional pump (14) is connected to a second pipe (16), and a miniature flow sensor (17) and a miniature electric valve (18) are installed on the second pipe (16).

2. The handheld micro-liquid nitrogen transfer device according to claim 1, characterized in that: A battery module (10) is installed on the inner bottom wall of the module box (2), and a charging module (11) is installed on the outer surface of the module box (2).

3. A handheld micro-liquid nitrogen transfer device according to claim 1, characterized in that: The outer surface of the storage cylinder (1) is equipped with a pull-out switch button (7) and a valve switch button (8).

4. A handheld micro-liquid nitrogen transfer device according to claim 1, characterized in that: The top surface of the module box (2) is equipped with a display screen (9).

5. A handheld micro-liquid nitrogen transfer device according to claim 1, characterized in that: The outer surface of the storage cylinder (1) is fitted with an anti-slip sleeve (6).

6. A handheld micro-liquid nitrogen transfer device according to claim 1, characterized in that: The threaded pipe (4) is threaded with a transfer head (5), and the bottom end of the second pipe (16) passes through the inside of the threaded pipe (4) and is connected to the transfer head (5).

7. A handheld micro-liquid nitrogen transfer device according to claim 1, characterized in that: The threaded tube (4) is connected to a capillary extraction pipe (19), and the bottom end of the second pipe (16) passes through the inside of the threaded tube (4) and is connected to the capillary extraction pipe (19).

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