Safe and practical liquid nitrogen freezing device
By designing a liquid nitrogen freezing device with a two-layer stainless steel and foam material, and a placement vehicle equipped with a brake universal wheel, the safety hazards and resource waste of existing devices are solved when placing and transferring liquid nitrogen. , realizes safe, durable and efficient storage of liquid nitrogen.
Patent Information
- Application Number
- CN202420835946.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-22
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-04-22
AI Technical Summary
When the existing liquid nitrogen freezing device is stored and transferred, it is easy to leak liquid nitrogen due to the sliding of the device. The device is not strong and easy to damage, the liquid nitrogen is easily volatile, wastes resources and pollutes the indoor air quality, and there is frostbite and freezing. Serious risk of pole drop.
A liquid nitrogen freezing device including a placing box and a placing car is designed. The placing box is made of stainless steel and foam, the lid is rotatable, and the box is equipped with a curved opening. The placing car is equipped with a brake universal wheel. and cart handles, through these designs, the safe transport and storage of liquid nitrogen is achieved.
It effectively avoids the risk of leakage and frostbite caused by the sliding of the liquid nitrogen device, reduces the volatility and waste of liquid nitrogen, improves the durability and safety of the device, and ensures the stable storage and use of liquid nitrogen.
Smart Images
Figure CN222444297U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical equipment, in particular to a safe and practical liquid nitrogen freezing device. Background Art
[0002] Liquid nitrogen is a transparent liquid obtained by nitrogen gas at extremely low temperatures. It is inert, colorless, odorless, low viscosity, non-corrosive, and non-flammable. It absorbs a lot of heat when vaporized and causes frostbite. Nitrogen makes up most of the atmosphere (78.03% by volume and 75.5% by weight). At normal pressure, the boiling point of nitrogen is -196.56°C, and 1 cubic meter of liquid nitrogen can expand to 696 cubic meters of pure gaseous nitrogen (21°C). If pressurized, liquid nitrogen can be obtained at a higher temperature. If the human body comes into contact with liquid nitrogen without protective measures, the skin may be severely frostbitten. If the nitrogen produced by vaporization at normal pressure is excessive, the oxygen partial pressure in the air may drop, causing hypoxia and suffocation.
[0003] Vitrification is a technique used to cryopreserve biological samples, especially eggs and embryos. The core of this method is to use high concentrations of cryoprotectants to solidify in ultra-low temperature environments to form a non-freezing glass-like solid, which can preserve the normal molecular and ion distribution of cells in liquid state, thereby protecting cells from damage during rapid cooling.
[0004] When cryogenically freezing gametes, embryos and ovarian tissues, in routine operations, medical staff freeze the gametes, embryos and ovaries on a freezing operation table, load them into corresponding freezing rods, and then transfer them to liquid nitrogen tanks for long-term frozen storage. However, conventional liquid nitrogen tanks are inconvenient to move due to their large size, heavy tank weight, small diameter and deep liquid level. Therefore, the freezing operation is usually carried out in a freezing container filled with liquid nitrogen.
[0005] At present, foam boxes or commercial polypropylene boxes are mainly used as freezing containers to hold liquid nitrogen in clinical practice. The freezing containers are then manually transported to the freezing operating table using pallets or directly. However, the foam box material is easily damaged and not durable. Although the polypropylene box material is stronger than foam, it has poor insulation properties, resulting in the volatile liquid nitrogen contained in it, wasting resources and seriously damaging indoor air quality. Manual use of pallets or direct transportation may cause potential safety hazards such as liquid nitrogen spilling from the freezing container or falling off the pallet, causing frostbite. Moreover, most freezing containers are placed directly on the operating table or flat bench, and there is also a serious risk that the freezing container may be accidentally knocked over and fall to the ground, causing liquid nitrogen leakage and the freezing rod falling off the liquid nitrogen. Utility Model Content
[0006] The purpose of the utility model is to provide a safe and practical liquid nitrogen freezing device which is convenient for containing and transporting liquid nitrogen, so as to solve the serious safety problem that when containing or transferring liquid nitrogen in the prior art, the liquid nitrogen container is easy to slide off the table, resulting in leakage of liquid nitrogen and falling off of the freezing carrier rod. In addition, the utility model also solves the technical problems that the liquid nitrogen container is not firm and easy to be damaged, the liquid nitrogen is easy to volatilize, and the resources are wasted and the indoor air quality is polluted.
[0007] In order to solve the above technical problems, the solution adopted by the utility model is as follows:
[0008] A safe and practical liquid nitrogen freezing device comprises a placement box and a placement trolley; the height of the placement trolley matches that of a freezing operating table, so that the placement box can be translated to the operating table for use, or a freezing carrier rod can be translated from the freezing operating table to the placement box; the placement box comprises a box body, a box cover and a handle; the size of the box cover matches that of the box body; two handles are provided, which are respectively installed on both sides of the box body; the box body and the box cover are provided with two layers; the placement trolley comprises a connecting rod, a placement slot, an idle layer and a moving device; the top end of the connecting rod is fixedly connected to the placement slot, and the bottom end is connected to the moving device; the idle layer is fixedly connected to the lower end of the connecting rod; an opening is provided at one corner of the upper end of the box body; the size of the placement slot matches that of the box body.
[0009] Furthermore, the two layers of the box body and the box cover are made of different materials, the outer layer is a stainless steel layer, and the inner layer is a foam layer. The outer part of the box body and the cover are both made of stainless steel, and the inner part is inlaid with foam material, which can temporarily contain liquid nitrogen and ensure that the liquid nitrogen is not easy to volatilize, the box body is not easy to be damaged, and it is durable.
[0010] Furthermore, the placement cart is provided with a cart handle, which is fixedly mounted on one side of the placement slot. The box can be transported and placed by combining the cart handle with the moving device, which is convenient for manual transportation.
[0011] Furthermore, the handle is hinged to the box; the opening is arc-shaped, and the outlet is lower than the box cover. The handle can be rotated 90 degrees. When in use, the medical staff lifts the box by the handle. The handle is parallel to the box, which is convenient for the medical staff to take the box when pouring liquid nitrogen through the arc-shaped opening, avoiding frostbite to the medical staff when the liquid nitrogen evaporates. The liquid outlet end of the opening is lower than the box cover, which can avoid the phenomenon that the box is frozen and sealed by liquid nitrogen.
[0012] Furthermore, the mobile device is a brakeable universal wheel, which can fix the device at one location to prevent the device from moving during operation.
[0013] Furthermore, the connecting rod is provided with a baffle, which is located above the idle layer and fixedly connected to the connecting rod. When temporarily placing items, the baffle can effectively prevent the items from falling from the idle layer when the placement cart is pushed.
[0014] The storage box can be directly placed on the clean bench desktop for use. The box cover can be closed during the time interval waiting for cell dehydration to reduce the volatilization of liquid nitrogen. The size of the storage box is convenient for operation.
[0015] The working principle of the utility model is as follows:
[0016] When in use, liquid nitrogen is placed from the liquid nitrogen tank into the box, the box cover is closed, the placement box is placed in the placement slot of the placement cart through the handles on both sides, the placement box is pushed to the edge of the freezing operating table through the cart handles and universal wheels, and the universal wheel brakes are applied to fix the position of the placement cart; when pouring liquid nitrogen from the box, the liquid nitrogen can be poured through the opening at a corner of the upper end of the box; the material of the stainless steel layer on the outside and the foam layer on the inside of the placement box can temporarily contain liquid nitrogen, and ensure that the liquid nitrogen is not easy to volatilize, the box body is not easy to be damaged, and it is durable; the idle layer can be used to temporarily place the box cover and spare freezing brackets, or to place spare freezing containers for timely replenishment of liquid nitrogen.
[0017] The beneficial effects of the utility model are as follows:
[0018] 1. The utility model provides two layers of storage boxes made of different materials as a temporary device for containing liquid nitrogen. Combined with a storage vehicle and a mobile device at the bottom of the storage vehicle, the storage boxes can be transferred to prevent the device containing liquid nitrogen from accidentally falling to the ground, causing liquid nitrogen leakage, and resulting in a serious risk of frostbite to medical staff and freezing rods falling out of the liquid nitrogen.
[0019] 2. The opening of the storage box of the utility model is not sealed, which makes it convenient to pour the liquid nitrogen while preventing the storage box from being frozen and sealed due to the volatilization of the liquid nitrogen, resulting in the situation that it cannot be opened for subsequent use.
[0020] 3. The idle layer of the utility model can be used to temporarily place the box cover and spare freezing brackets, or to place spare freezing containers for timely replenishment of liquid nitrogen. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a schematic diagram of the main view structure of the utility model;
[0022] Figure 2 This is a schematic diagram of the cross-sectional structure of the placement box of the utility model;
[0023] Figure 3 This is a schematic diagram of the main structure of the box body of the present utility model.
[0024] In the figure: 1. placement box; 2. placement cart; 3. box body; 301. opening; 4. box cover; 401. stainless steel layer; 402. foam layer; 5. handle; 6. connecting rod; 601. baffle bar; 7. placement slot; 8. idle layer; 9. moving device; 10. cart handle. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0026] In the description of the present utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0027] The following is a further detailed description of a safe and practical liquid nitrogen refrigeration device of the utility model in conjunction with the accompanying drawings: Example 1
[0028] A safe and practical liquid nitrogen freezing device comprises a placement box 1 and a placement vehicle 2; the placement box 1 comprises a box body 3, a box cover 4 and a handle 5; the size of the box cover 4 matches the box body 3; two handles 5 are provided, which are respectively installed on both sides of the box body 3; the box body 3 and the box cover 4 are provided with two layers; the placement vehicle 2 comprises a connecting rod 6, a placement slot 7, an idle layer 8 and a moving device 9; the top end of the connecting rod 6 is fixedly connected to the placement slot 7, and the bottom end is connected to the moving device 9; the idle layer 8 is fixedly connected to the lower end of the connecting rod 6; an opening 301 is provided at one corner of the upper end of the box body 3; the size of the placement slot 7 matches the box body 3.
[0029] The working principle of this embodiment is as follows:
[0030] When this embodiment is used, liquid nitrogen is placed from the liquid nitrogen tank into the box body 3, the box cover 4 is closed, and the placement box 1 is placed in the placement slot 7 of the placement vehicle 2 through the handles 5 on both sides. The medical staff moves the placement vehicle 2 through the moving device 9, moves the placement box 1 to the edge of the freezing operating table, and prevents the placement box 1 from being sealed through the opening 301 at a corner of the upper end of the box body 3. At the same time, the liquid nitrogen is poured out, and the box cover 4 and the spare freezing bracket are temporarily placed on the idle layer 8. Example 2
[0031] The difference from Example 1 lies in that the two layers of the box body 3 and the box cover 4 are made of different materials, the outer layer is a stainless steel layer 401, and the inner layer is a foam layer 402; the placement cart 2 is provided with a cart handle 10; the cart handle 10 is fixedly installed on one side of the placement slot 7; the handle 5 is hinged to the box body 3; the opening 301 is arc-shaped, and the outlet is lower than the box cover 4; the moving device 9 is a universal wheel with brakes; the connecting rod 6 is provided with a baffle 601; the baffle 601 is located above the idle layer 8 and is fixedly connected to the connecting rod 6.
[0032] The placement cart 2 is pushed by the brakeable universal wheels and the cart handle 10 to transfer and fix the placement box 1. The medical staff lifts the box body 3 by the handle 5, and the handle 5 is parallel to the box body 3. After taking out the box body 3, the liquid nitrogen is poured through the arc-shaped opening 301. The liquid outlet end of the opening is lower than the box cover 4 to prevent the liquid nitrogen from volatilizing and causing the placement box to be frozen and sealed by the liquid nitrogen. The outside of the box body 3 and the box cover 3 are both stainless steel layers 401, and the inside is inlaid with a foam layer 402, which can temporarily contain liquid nitrogen and ensure that the liquid nitrogen is not easy to volatilize. The box body 3 is not easy to be damaged and is durable.
[0033] The working principle of this embodiment is the same as that of Embodiment 1. Example 3
[0034] The difference from Example 2 is that the length of the box body 3 is 29 cm, the width is 23 cm, and the height is 18 cm. The stainless steel layer 401 wraps the foam layer 402, and the thickness of the box body is 3 cm; the length of the interior of the box body 3 is 23 cm, the width is 16.5 cm, and the depth is 12 cm, which is convenient for medical staff to operate. The box cover 4 matches the box body 3, and the length of the interior of the box cover 4 is 22 cm, the width is 16.5 cm, and the depth is 4 cm. After the box cover 4 covers the box body 3, the box cover 4 is installed on the box body 3 through the internal foam layer 402 to prevent the box cover 4 from falling off when the placement box 1 is moved; the placement cart 2 matches the size of the placement box 1; the placement cart 2 is 65 cm high, 40 cm long, and 30 cm wide, which is convenient for placing and moving the placement box 1.
[0035] The working principle of this embodiment is the same as that of Embodiment 2.
[0036] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A safe and practical liquid nitrogen freezing device, characterized in that: The invention comprises a storage box (1) and a storage vehicle (2); the storage box (1) comprises a box body (3), a box cover (4) and a handle (5); the size of the box cover (4) matches that of the box body (3); two handles (5) are provided, which are respectively installed on both sides of the box body (3); the box body (3) and the box cover (4) are provided with two layers; the storage vehicle (2) comprises a connecting rod (6), a storage groove (7), an idle layer (8) and a moving device (9); the top end of the connecting rod (6) is fixedly connected to the storage groove (7), and the bottom end is connected to the moving device (9); the idle layer (8) is fixedly connected to the lower end of the connecting rod (6); an opening (301) is provided at one corner of the upper end of the box body (3); the size of the storage groove (7) matches that of the box body (3).
2. A safe and practical liquid nitrogen freezing device according to claim 1, characterized in that: The two layers of the box body (3) and the box cover (4) are made of different materials, the outer layer is a stainless steel layer (401), and the inner layer is a foam layer (402).
3. A safe and practical liquid nitrogen freezing device according to claim 1, characterized in that: The placement cart (2) is provided with a cart handle (10); the cart handle (10) is fixedly mounted on one side of the placement slot (7).
4. A safe and practical liquid nitrogen freezing device according to claim 1, characterized in that: The handle (5) is hinged to the box body (3); the opening (301) is arc-shaped, and the outlet is lower than the box cover (4).
5. A safe and practical liquid nitrogen freezing device according to claim 1, characterized in that; The moving device (9) is a brakeable universal wheel.
6. A safe and practical liquid nitrogen freezing device according to claim 1, characterized in that; The connecting rod (6) is provided with a blocking bar (601); the blocking bar (601) is located above the idle layer (8) and is fixedly connected to the connecting rod (6).