Liquid nitrogen biological container filling device

Abstract

The utility model relates to a liquid nitrogen biological container filling device, which belongs to the technical field of liquid nitrogen filling and solves the technical problems that the liquid level of liquid nitrogen is inconvenient to observe and liquid nitrogen is not full or overflows easily when the liquid nitrogen is filled at present. The liquid nitrogen biological container filling device comprises a filling hopper, an indicating rod and a floating ball, the filling hopper is provided with a containing space for containing liquid nitrogen, and a liquid outlet is formed in the bottom of the filling hopper; the indicating rod is installed in the filling hopper in a sliding mode. The floating ball is installed below the indicating rod and located outside the containing space, and the floating ball is used for driving the indicating rod to move in the axial direction of the indicating rod so as to indicate the height of the liquid level. Through mechanical linkage of the floating ball and the indicating rod, a worker does not need complex operation or debugging, the liquid level height of liquid nitrogen in a filling container can be accurately observed in real time through the indicating rod only by simply observing scales on the indicating rod or the position of an indicator, the fault rate of sensing elements such as a liquid level meter caused by low temperature is reduced, and the working efficiency is improved. And potential safety hazards such as liquid nitrogen overflow or insufficient filling are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid nitrogen filling, and particularly relates to a liquid nitrogen biological container filling device. Background Art

[0002] Due to its extremely low temperature characteristics, liquid nitrogen is widely used in the long-term preservation of cells, tissues and biological samples, which is of great significance to the development of medical, scientific research and other fields. However, when storing liquid nitrogen, it is necessary to fill the liquid nitrogen into a refrigerated container. Due to the transparency and low temperature characteristics of liquid nitrogen, it is difficult to accurately judge whether the liquid nitrogen has filled the container only by visual observation, which often leads to the situation that the liquid nitrogen is not full or overflows during actual operation.

[0003] Currently, to solve this problem, electronic monitoring devices such as capacitive liquid level gauges are mostly used in the industry to monitor the liquid nitrogen level in real time. However, although such technologies have improved the automation of monitoring to a certain extent, low-temperature liquid nitrogen is likely to damage the sensing elements of the liquid level gauge, affecting the measurement accuracy, and even causing equipment failures, thus unable to accurately reflect the actual liquid level of liquid nitrogen. This may waste resources due to liquid nitrogen overflow, and even damage the container and surrounding components, shortening the service life of the equipment. Summary of the Utility Model

[0004] The utility model provides a liquid nitrogen biological container filling device, which is used to solve the technical problem that it is not convenient to observe the liquid nitrogen level during the current liquid nitrogen filling process, and it is easy to cause the situation that the liquid nitrogen is not full or overflows.

[0005] The utility model is realized through the following technical solutions: a liquid nitrogen biological container filling device includes a filling hopper, an indicating rod and a floating ball. The filling hopper has a receiving space for accommodating liquid nitrogen, and a liquid outlet is opened at the bottom; the indicating rod is slidably installed in the filling hopper; the floating ball is installed below the indicating rod and is located outside the receiving space. The floating ball is used to drive the indicating rod to move along the axial direction of the indicating rod to indicate the liquid level height.

[0006] Optionally, it further includes a sealing plate. One end of the sealing plate is installed on the indicating rod, and the other end is installed on the floating ball. The sealing plate is located below the filling hopper. The floating ball drives the sealing plate to move along the axial direction of the indicating rod to open and close the liquid outlet.

[0007] Optionally, it further includes an opening and closing valve, which is installed on the filling hopper and is located in the receiving space to open and close the liquid outlet.

[0008] Optionally, the opening and closing valve includes a valve body and a connecting rod. The valve body is rotatably installed in the filling hopper. The valve body has a blocking portion and a filling portion. The filling portion has a flow channel, and the flow channel is adapted to the liquid outlet. An opening is formed in the side wall of the filling portion, and the opening is communicated with the flow channel. The connecting rod is installed at one end of the valve body away from the filling hopper.

[0009] Optionally, the filling hopper includes a housing and a connecting block. The housing is used to receive liquid nitrogen, and the accommodating space is arranged in the housing. The connecting block is installed at the bottom of the housing, and the liquid outlet is formed in the connecting block. The liquid outlet is communicated with the accommodating space.

[0010] Optionally, a liquid injection pipe is further included. One end of the liquid injection pipe is installed below the filling hopper and communicated with the liquid outlet, and the float ball is partially located in the liquid injection pipe.

[0011] Optionally, a pipe clamp is further included. The pipe clamp is installed at the top of the filling hopper to fix the pipe body for adding liquid nitrogen into the filling hopper.

[0012] Optionally, a protective cover is further included. The protective cover is installed at the top of the filling hopper. The protective cover has a liquid injection port, and the pipe clamp is located in the liquid injection port.

[0013] Optionally, a handle is further included. The handle is installed on the side wall of the filling hopper and is located on the side of the filling hopper away from the liquid injection port.

[0014] The utility model has the following beneficial effects compared with the prior art:

[0015] A liquid nitrogen biological container filling device provided by the utility model includes a filling hopper, an indicating rod and a float ball. The filling hopper has an accommodating space for accommodating liquid nitrogen, and a liquid outlet is formed at the bottom. The indicating rod is slidably installed in the filling hopper. The float ball is installed below the indicating rod and is located outside the accommodating space. The float ball is used to drive the indicating rod to move along the axial direction of the indicating rod to indicate the liquid level height.

[0016] With the above structure, when using a liquid nitrogen biological container filling device provided by the utility model, place the filling hopper on top of the filling container, make the floating ball located inside the filling container, align the liquid outlet with the mouth of the filling container, then add liquid nitrogen into the filling hopper, and the liquid nitrogen enters the filling container along the liquid outlet. As the liquid nitrogen is filled, the floating ball rises with the liquid level height of the filling container. The user observes the markings on the indicating rod according to the length of the indicating rod extending out to monitor the liquid level height in the filling container; through the mechanical linkage between the floating ball and the indicating rod, the staff does not need complex operations or debugging, and only needs to simply observe the scale on the indicating rod or the position of the indicator, then they can observe the liquid level height of the liquid nitrogen in the filling container in real time and accurately through the indicating rod, reducing the failure rate of sensing elements such as liquid level gauges caused by low temperature, and reducing potential safety hazards such as liquid nitrogen overflow or insufficient filling. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1-2 is a schematic structural diagram of a liquid nitrogen biological filling device provided by the present utility model;

[0019] Figure 3 is a top view of a liquid nitrogen biological filling device provided by the present utility model;

[0020] Figure 4 is a cross-sectional view of a liquid nitrogen biological filling device provided by the utility model;

[0021] Figure 5 is Figure 4 an enlarged schematic structural diagram of area A in

[0022] In the figure:

[0023] 1 - filling hopper; 11 - housing; 111 - accommodation space; 12 - connecting block; 121 - liquid outlet; 2 - indicating rod; 3 - floating ball; 4 - sealing plate; 5 - opening and closing valve; 51 - valve body; 511 - sealing part; 512 - filling part; 5211 - flow channel; 52 - connecting rod; 6 - liquid injection pipe; 7 - pipe clamp; 71 - fixing ring; 72 - bolt; 8 - protective cover; 9 - handle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do 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 should not be understood as a limitation on the present application.

[0025] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0026] In the description of this application, it should be noted that, 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 components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0028] Example

[0029] The utility model provides a liquid nitrogen biological container filling device, which is used to solve the technical problem that it is inconvenient to observe the liquid nitrogen level during liquid nitrogen filling, which easily leads to insufficient liquid nitrogen or overflow. The liquid nitrogen biological container filling device includes a filling bucket 1, an indicator rod 2 and a floating ball 3, wherein:

[0030] The filling hopper 1 is generally in a conical shape or a similar shape with a wider top and a narrower bottom to facilitate the smooth inflow of liquid nitrogen and reduce residue. Its main body is made of high-quality metal materials that are corrosion-resistant and low-temperature-resistant, such as stainless steel or special alloys, to ensure the structural stability and durability in the ultra-low temperature environment of liquid nitrogen. An accommodation space 111 is formed inside the filling hopper 1 for storing the liquid nitrogen to be filled. The size of this space can be set according to actual needs to adapt to liquid nitrogen containers of different specifications and capacities. A liquid outlet 121 is provided at the bottom of the filling hopper 1, and the liquid outlet 121 should ensure that the liquid nitrogen can flow out smoothly.

[0031] The indicating rod 2 is slidably installed inside the filling hopper 1. The indicating rod 2 is made of materials that are corrosion-resistant and low-temperature-resistant to ensure its stable operation in the ultra-low temperature environment of liquid nitrogen. The indicating rod 2 can slide freely along the axis without detaching from the filling hopper 1. The top of the indicating rod 2 can extend to the outside of the filling hopper 1. Scale marks or different colors are provided on the indicating rod 2 so that the staff can intuitively read the liquid level height through the indicating rod 2.

[0032] The floating ball 3 is connected to the bottom of the indicating rod 2 and is installed below the filling hopper 1. When filling the liquid nitrogen, the floating ball 3 extends into the filling container. The floating ball 3 is made of materials suitable for the low-temperature environment to ensure that it can float on the surface of the liquid nitrogen and move up and down with the liquid level. When the amount of liquid nitrogen in the filling container changes, the floating ball 3 will rise or fall accordingly, and drive the indicating rod 2 to move axially. As the floating ball 3 moves, the indicating rod 2 rises or falls with the floating ball 3, and the position of the indicating rod 2 changes. Thus, the liquid level height in the filling container is indicated by the scale marks or colors on the indicating rod 2. The staff only needs to observe the scale or the position of the indicator on the indicating rod 2 to quickly and accurately understand the filling situation of the liquid nitrogen; through the linkage of the floating ball 3 and the indicating rod 2, the staff only needs to observe the scale or the position of the indicator on the indicating rod 2 to know the liquid level height, without the need for complex operations or debugging, reducing human errors and the instability of electronic devices in the low-temperature environment.

[0033] With the above structure, when using a liquid nitrogen biological container filling device provided by the utility model, the filling hopper 1 is placed on the top of the filling container, the floating ball 3 is located inside the filling container, the liquid outlet 121 is aligned with the filling container opening, and then liquid nitrogen is added into the filling hopper 1. The liquid nitrogen enters the filling container along the liquid outlet 121. As the liquid nitrogen is filled, the floating ball 3 rises with the liquid level height of the filling container. The user observes the marks on the indicating rod 2 according to the length of the indicating rod 2 extended, and monitors the liquid level height in the filling container; through the mechanical linkage between the floating ball 3 and the indicating rod 2, the staff does not need complex operations or debugging. Just by simply observing the scale or the position of the indicator on the indicating rod 2, the liquid level height of the liquid nitrogen in the filling container can be observed in real time and accurately through the indicating rod 2, reducing the equipment failure rate caused by low temperature and reducing safety hazards such as liquid nitrogen overflow or insufficient filling.

[0034] An optional implementation manner of this embodiment is as follows: In order to facilitate timely closing of the liquid outlet 121 when the filling is completed and reduce liquid nitrogen overflow, the liquid nitrogen biological filling device further includes a blocking plate 4. One end of the blocking plate 4 is installed on the indicating rod 2 so that it can move along with the axial movement of the indicating rod 2, and the other end is connected to the floating ball 3 to ensure that the floating ball 3 can drive the blocking plate 4 to move synchronously during the lifting and lowering process. The blocking plate 4 is located below the filling hopper 1. Before the filling starts, the blocking plate 4 is in an open state, allowing liquid nitrogen to flow into the filling container through the liquid outlet 121. As the filling progresses and the liquid nitrogen continuously flows in, the liquid level in the filling container gradually rises, and the floating ball 3 rises with the rising liquid level and drives the indicating rod 2 and the blocking plate 4 to rise synchronously through the connecting piece. During the filling process, the blocking plate 4 is always located above the liquid outlet 121 but does not completely block the liquid outlet 121 to allow the liquid nitrogen to flow in smoothly. When the liquid level approaches the preset upper limit of the filling container, the floating ball 3 continues to rise and drives the blocking plate 4 to move to a position where it can completely cover the liquid outlet 121. At this time, the blocking plate 4 automatically blocks the liquid outlet 121, preventing more liquid nitrogen from flowing into the filling container. With the complete blocking of the liquid outlet 121 by the blocking plate 4, the filling process of the liquid nitrogen automatically stops; through the automatic opening and closing function of the blocking plate 4, the overflow of liquid nitrogen when the filling is completed is effectively reduced, and the safety hazard is lowered.

[0035] An alternative implementation of this embodiment is as follows: To more precisely control the liquid nitrogen filling process and ensure that the liquid outlet 121 can be closed in a timely manner when the filling is completed, the liquid nitrogen biological container filling device further includes a switching valve 5. The switching valve 5 is installed in the filling hopper 1 and is located within the accommodation space 111 to open and close the liquid outlet 121. Specifically, before the filling starts, the switching valve 5 is in a closed state, preventing liquid nitrogen from flowing from the filling hopper 1 into the filling container. When the filling is about to start, the switching valve 5 is opened to allow liquid nitrogen to flow into the filling container through the liquid outlet 121. As the liquid nitrogen continuously flows in, the liquid level in the filling container gradually rises. At this time, the switching valve 5 remains open to allow the liquid nitrogen to flow out smoothly. Meanwhile, the float ball 3 and the indicating rod 2 system continue to work to monitor the height of the liquid level. When it is necessary to stop injecting liquid nitrogen into the filling container, the switching valve 5 closes the liquid outlet 121, cutting off the outflow path of the liquid nitrogen. In this way, the liquid outlet 121 can be closed in a timely manner when the liquid nitrogen filling needs to be stopped. By combining the switching valve 5 with the float ball 3 and the plugging plate 4 system, a double guarantee is provided to ensure that the liquid outlet 121 can be accurately and timely closed when the filling is completed, preventing liquid nitrogen from overflowing. At the same time, the switching valve 5 can also be used to close the liquid outlet 121 in a timely manner according to the usage requirements, increasing the flexibility and convenience of the operation.

[0036] An alternative implementation of this embodiment is as follows: The switching valve 5 includes a valve body 51, a connecting rod 52, and a handle. The valve body 51 is rotatably installed inside the filling hopper 1. The valve body 51 is columnar and can rotate around its axis. The valve body 51 includes a plugging portion 511 and a filling portion 512. The plugging portion 511 is used to completely cover and block the liquid outlet 121 when needed to prevent the liquid nitrogen from flowing out continuously. The filling portion 512 has a flow channel 5211, and the shape and size of the flow channel 5211 are adapted to those of the liquid outlet 121 to ensure that the liquid nitrogen can flow through smoothly. An opening is specially provided on the side wall of the filling portion 512, and the opening is communicated with the flow channel 5211 to form an inlet for the liquid nitrogen to enter the flow channel 5211. Specifically, a through hole is provided on the plugging portion 511 along the axial direction of the filling hopper 1. One end of the indicating rod 2 passes through the through hole and is connected to the plugging plate 4. A partition tube is installed in the through hole, and the indicating rod 2 is located inside the partition tube. The partition tube is used to block the liquid nitrogen from flowing through the through hole to the upper part of the plugging plate 4 and being discharged from the liquid outlet 121.

[0037] One end of the connecting rod 52 is installed on the end of the valve body 51 away from the filling hopper 1, and the other end extends outside the filling hopper 1 to provide an external operation point for the staff to easily push the valve body 51 to rotate through the connecting rod 52. The end of the connecting rod 52 away from the valve body 51 has a handle for the user to easily hold and apply force, thus easily realizing the rotation operation of the valve body 51.

[0038] Before the filling starts, the blocking part 511 covers the liquid outlet 121. When filling is required, hold the handle and push the valve body 51 to rotate through the connecting rod 52 until the flow channel 5211 of the filling part 512 is completely aligned and connected with the liquid outlet 121. At this time, liquid nitrogen can enter the flow channel 5211 through the opening on the side wall of the filling part 512 and be smoothly discharged through the liquid outlet 121 into the filling container. At the same time, by adjusting the connection size between the flow channel 5211 and the liquid outlet 121, the flow rate of the liquid nitrogen flowing out of the liquid outlet 121 is adjusted; as the liquid nitrogen is continuously injected, the liquid level in the filling container gradually rises; during this process, the opening and closing valve 5 remains open to ensure the smooth flow of liquid nitrogen; when the liquid level in the filling container reaches the preset height; hold the handle again and push the valve body 51 to rotate in the reverse direction. At this time, the blocking part 511 gradually approaches and finally completely covers the liquid outlet 121, realizing the blocking of the liquid outlet 121. In this way, even if there is still remaining liquid nitrogen in the filling hopper 1, it cannot flow out through the liquid outlet 121 into the filling container, thus effectively preventing the overflow of liquid nitrogen.

[0039] An alternative implementation of this embodiment is as follows: The filling hopper 1 includes a housing 11 and a connecting block 12. The housing 11 is used to hold liquid nitrogen, and an accommodation space 111 is provided inside the housing 11 for holding the liquid nitrogen supplied from the outside. The connecting block 12 is installed at the bottom of the housing 11. The connecting block 12 is designed in a stepped shape, so that a stable support surface can be formed when the connecting block 12 contacts the filling container, effectively preventing the filling hopper 1 from sliding and tilting during the filling process. At the same time, the stepped design also increases the contact area between the connecting block 12 and the filling container, improving the stability and reliability of the connection; the liquid outlet 121 is opened on the connecting block 12 and is connected to the accommodation space 111 inside the housing 11; the size of the liquid outlet 121 should ensure that the liquid nitrogen can flow smoothly from the filling hopper 1 into the filling container; during the filling process, the liquid nitrogen is first injected into the accommodation space 111 of the housing 11, and then the liquid nitrogen flows out through the liquid outlet 121 into the filling container. Since the connecting block 12 is designed in a stepped shape and is firmly connected to the filling container, the filling hopper 1 can maintain a stable position and posture even under the impact force generated by the flow of liquid nitrogen and will not slide or tilt. In this way, it is ensured that the liquid nitrogen can be accurately injected into the filling container.

[0040] An optional implementation manner of this embodiment is as follows: In order to reduce the splashing phenomenon of liquid nitrogen during filling, the liquid nitrogen biological container filling device further includes a liquid injection pipe 6. One end of the liquid injection pipe 6 is installed at the end of the connecting block 12 away from the housing 11 and is communicated with the liquid outlet 121. In this way, the liquid nitrogen flowing out from the inside of the housing 11 can smoothly enter the filling container through the liquid injection pipe 6. Part of the floating ball 3 is located in the liquid injection pipe 6. When the liquid nitrogen flows into the filling container through the liquid injection pipe 6, the floating ball 3 will rise as the liquid level rises. During this process, the floating ball 3 can stably guide the flow direction of the liquid nitrogen and reduce the splashing phenomenon caused by the liquid nitrogen directly impacting the bottom or side wall of the filling container; at the beginning of filling, the staff inserts the liquid injection pipe 6 into the filling container. Subsequently, the liquid nitrogen flows out from the housing 11 of the filling hopper 1, enters the liquid injection pipe 6 through the liquid outlet 121, and finally is smoothly injected into the filling container through the liquid injection pipe 6. The liquid injection pipe 6 effectively reduces the splashing phenomenon of liquid nitrogen during filling.

[0041] An optional implementation manner of this embodiment is as follows: In order to facilitate the fixation of the liquid nitrogen pipeline injected into the filling hopper 1, the liquid nitrogen biological container filling device further includes a pipe clamp 7. The pipe clamp 7 is installed on the top of the filling hopper 1. The pipe clamp 7 is composed of a fixing ring 71 and a bolt 72. The axial direction of the fixing ring 71 is parallel to the axial direction of the filling hopper 1. The bolt 72 is arranged along the radial direction of the fixing ring 71. One end of the bolt 72 passes through the outer wall of the fixing ring 71 and extends into the fixing ring 71. The inner diameter of the fixing ring 71 is larger than the outer diameter of the liquid nitrogen injection pipe 6 to ensure that the pipeline can enter smoothly and stably. During use, first accurately align and insert one end of the liquid nitrogen injection pipe 6 into the fixing ring 71. Subsequently, rotate the bolt 72. By the thread action of the bolt 72, gradually push the bolt 72 towards the liquid nitrogen injection pipe 6. The end of the bolt 72 will gradually press against the outer wall of the liquid nitrogen injection pipe 6 to form a firm clamping force. When the bolt 72 reaches an appropriate tightening degree, stop rotating and check whether the liquid nitrogen injection pipe 6 is firmly fixed in the fixing ring 71 to ensure that there is no loosening or shaking phenomenon to ensure the smooth progress of subsequent filling operations.

[0042] An optional implementation manner of this embodiment is as follows: In order to reduce the splashing of liquid nitrogen, the liquid nitrogen biological container filling device further includes a protective cover 8. The protective cover 8 is installed on the top of the filling hopper 1. The protective cover 8 covers a partial area on the top of the filling hopper 1 to form a protective barrier. The protective cover 8 is provided with a liquid injection port, and the pipe clamp 7 is installed in the liquid injection port. When the liquid nitrogen is injected into the filling hopper 1 through the liquid nitrogen injection pipe 6, splashing is likely to occur. Through the protection of the protective cover 8, the splashing liquid nitrogen will be blocked and guided into the filling hopper 1, thereby reducing the risk of liquid nitrogen splashing onto the surrounding environment or the operator.

[0043] An alternative implementation of this embodiment is as follows: To facilitate the gripping of the filling hopper 1, the liquid nitrogen biological container filling device further includes a handle 9, which is installed on the side wall of the filling hopper 1. By adding the handle 9, the operator can more easily lift, move, and position the filling hopper 1. During the filling process, the handle 9 provides a stable gripping point, reducing accidental situations caused by slippery hands or unstable gripping; the handle 9 is located on the side of the filling hopper 1 away from the liquid injection port, thereby reducing the splashing of liquid nitrogen from the liquid injection port when gripping the handle 9.

[0044] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope recorded in the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. A liquid nitrogen biological container filling device, characterized in that, Comprising: A filling hopper having a receiving space for containing liquid nitrogen, and a liquid outlet is formed at the bottom. An indicating rod slidably mounted within the filling hopper. A floating ball mounted below the indicating rod and outside the receiving space, the floating ball being configured to drive the indicating rod to move along the axial direction of the indicating rod to indicate the liquid level height. A sealing plate, one end of which is mounted on the indicating rod and the other end is mounted on the floating ball, the sealing plate being located below the filling hopper, and the floating ball driving the sealing plate to move along the axial direction of the indicating rod to open and close the liquid outlet. An opening and closing valve mounted on the filling hopper and within the receiving space to open and close the liquid outlet; the opening and closing valve includes: a valve body rotatably mounted within the filling hopper, the valve body having a sealing portion and a filling portion, the filling portion having a flow channel adapted to the liquid outlet, an opening is formed in the side wall of the filling portion and is in communication with the flow channel; a connecting rod mounted on the end of the valve body remote from the filling hopper.

2. The filling device for a liquid nitrogen biological container according to claim 1, wherein, The filling hopper includes: A housing for receiving liquid nitrogen, the receiving space being provided within the housing. A connecting block mounted on the bottom of the housing, the liquid outlet being formed in the connecting block and being in communication with the receiving space.

3. A liquid nitrogen biological container filling device according to claim 1, characterized in that, Further comprising: A liquid injection pipe, one end of which is mounted below the filling hopper and is in communication with the liquid outlet, and a part of the floating ball is located within the liquid injection pipe.

4. A liquid nitrogen biological container filling device according to claim 1, characterized in that, Further comprising: A pipe clamp mounted on the top of the filling hopper to fix the pipe for adding liquid nitrogen into the filling hopper.

5. A liquid nitrogen biological container filling device according to claim 4, characterized in that, Further comprising: A protective cover mounted on the top of the filling hopper, the protective cover having a liquid injection port, and the pipe clamp is located within the liquid injection port.

6. The filling device for a liquid nitrogen biological container according to claim 5, characterized in that, Further comprising: A handle mounted on the side wall of the filling hopper and on the side of the filling hopper remote from the liquid injection port.

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