Automatic liquid supplementing system of liquid nitrogen tank

Abstract

The utility model relates to the technical field of liquid replenishing systems, in particular to an automatic liquid replenishing system for a liquid nitrogen tank, which comprises a temperature control unit, a liquid replenishing pipeline, a liquid replenishing pipeline, a liquid replenishing pipeline, a liquid replenishing pipeline, a liquid replenishing pipeline, a liquid replenishing pipeline, a liquid replenishing pipeline, a liquid replenishing pipeline, a liquid replenishing pipeline, a liquid replenishing pipeline, a liquid replenishing pipeline, a liquid replenishing pipeline, a liquid replenishing pipeline and a liquid replenishing pipeline, the on-off unit is communicated with the liquid supplementing pipeline, and the on-off unit is used for controlling the on-off state of the liquid supplementing pipeline. The full-automatic liquid supplementing system can achieve full-automatic liquid supplementing of the liquid tank so as to maintain the temperature specified by the system; in addition, a pressure sensor is further arranged in the device and used for protecting the pressure of a pipeline, and it is guaranteed that the potential risk of overpressure cannot occur in the use process of the product. In consideration of the precious nature of cryopreserved samples of the system, besides an automatic liquid supplementing device, a set of manual liquid supplementing structure is further arranged, the situation that the samples are damaged due to the fact that automatic liquid supplementing cannot be achieved under the condition of product power failure is prevented, the overall structural design is reasonable, and the actual use requirement is further met.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid replenishment systems, in particular to an automatic liquid replenishment system for a liquid nitrogen tank. Background Art

[0002] Ultra-low temperature storage of biological samples was previously done in liquid nitrogen tanks, which are widely used in experimental research and the medical industry. Traditional storage has many disadvantages, such as chaotic sample storage that is prone to errors, difficult sample storage temperature management, and easy frostbite. With the increasing requirements for use in recent years, automated liquid nitrogen tank storage has gained favor among users.

[0003] At present, the common design of the automatic liquid replenishment system is to add a solenoid valve structure and realize automatic control in conjunction with the set liquid level sensor, such as a fully automatic liquid nitrogen replenishment system disclosed in Chinese Patent Publication No. "CN205504476U" and a liquid nitrogen automatic replenishment device disclosed in Chinese Patent Publication No. "CN217277298U".

[0004] However, the structures of current rehydration systems are all single, and most of them do not take into account the problem of increased temperature of the liquid nitrogen in contact with the rehydration pipeline at the initial stage of rehydration. If this part of the liquid nitrogen is not processed, it will affect the temperature stability of the liquid tank and affect the safety of sample storage.

[0005] Based on this, in order to solve the above problems, we propose a liquid nitrogen tank automatic refilling system to achieve automatic refilling while improving the safety and protection of the system. Utility Model Content

[0006] The utility model aims to solve the above-mentioned shortcomings in the prior art and proposes an automatic liquid replenishing system for a liquid nitrogen tank.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] Design a liquid nitrogen tank automatic refilling system, including:

[0009] The temperature control unit is installed on the liquid replenishment pipeline and is used to detect the temperature of liquid nitrogen at the initial stage of liquid nitrogen introduction. When the temperature exceeds a threshold, the liquid nitrogen is discharged into the atmosphere until the temperature is lower than the threshold and the discharge is stopped;

[0010] An on-off unit is connected to the liquid infusion pipeline, and is used to control the on and off of the liquid infusion pipeline. A liquid tank is also connected to the output end of the on-off unit;

[0011] and a control unit, wherein the temperature control unit and the on-off unit are both electrically connected to the control unit, so that when the temperature of the liquid nitrogen is lower than a threshold value, the control unit controls the on-off unit to open the liquid replenishing pipeline to replenish the liquid tank.

[0012] Furthermore, the temperature control unit includes a solenoid valve 1 and a gas-liquid separator which are sequentially connected to the liquid replenishing pipeline, and the gas-liquid separator is used to discharge the high-temperature liquid nitrogen in the liquid replenishing pipeline;

[0013] Wherein, temperature sensors are arranged between the solenoid valve 1 and the gas-liquid separator and at the inlet of the liquid tank, and the solenoid valve 1, the gas-liquid separator and the temperature sensor are all electrically connected to the control unit.

[0014] Furthermore, the on-off unit includes a second solenoid valve connected to the liquid infusion pipeline, and the second solenoid valve is located in front of the inlet of the liquid tank, wherein the second solenoid valve is electrically connected to the control unit.

[0015] Furthermore, a pressure sensor and a safety valve are installed on the liquid replenishment pipeline. When the pressure sensor detects that the input liquid nitrogen pressure is too high, the safety valve is used to release the high-pressure liquid;

[0016] The pressure sensor and the safety valve are both electrically connected to the control unit.

[0017] Furthermore, two solenoid valves are connected in sequence.

[0018] Furthermore, a manual valve 1 is connected between the two ends of the two solenoid valves 2.

[0019] Furthermore, a manual valve 2 is connected between the two ends of the solenoid valve 1.

[0020] Furthermore, it also includes a filtering unit, which is installed at the inlet end of the liquid replenishing pipeline and is used to communicate with an external liquid nitrogen device.

[0021] Furthermore, the filtering unit is a liquid nitrogen filter.

[0022] Furthermore, two liquid level sensors are installed in the liquid tank, and the two liquid level sensors are used to detect the high and low liquid levels in the liquid tank respectively, and the liquid level sensors are connected to the control unit signal.

[0023] The utility model proposes an automatic liquid replenishing system for a liquid nitrogen tank, and the beneficial effects are: the utility model can realize fully automatic liquid replenishing of the liquid tank to maintain the temperature specified by the system; in addition, the utility model is also provided with a pressure sensor for protecting the pipeline pressure to ensure that the product will not have the dangerous hidden danger of overpressure during use; at the same time, considering the preciousness of the frozen samples of the system, in addition to the automatic liquid replenishing device, there is also a set of manual liquid replenishing structure to prevent the sample from being damaged due to the inability to automatically replenish liquid when the product is powered off, and the overall structural design is reasonable to further meet the needs of actual use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the utility model.

[0025] In the figure: 1. Liquid tank; 2. Control unit; 3. Solenoid valve 1; 4. Gas-liquid separator; 5. Temperature sensor; 6. Solenoid valve 2; 7. Pressure sensor; 8. Safety valve; 9. Manual valve 1; 10. Manual valve 2; 11. Filter unit. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0027] Reference Figure 1 An embodiment of the utility model discloses an automatic liquid replenishing system for a liquid nitrogen tank. In this embodiment, the system is installed in an ultra-low temperature storage box as an example. The design purpose is to realize fully automatic liquid replenishment of the liquid tank to maintain the temperature specified by the system.

[0028] Specifically, the system in this embodiment includes a temperature control unit, which is installed on the liquid replenishment pipeline and is used to detect the temperature of liquid nitrogen at the initial stage of liquid nitrogen introduction. When the temperature exceeds a threshold, the liquid nitrogen is discharged into the atmosphere until the temperature is lower than the threshold and the discharge is stopped;

[0029] In addition, it also includes an on-off unit, which is connected to the liquid replenishing pipeline, and the on-off unit is used to control the on and off of the liquid replenishing pipeline. A liquid tank 1 is also connected to the output end of the on-off unit, and the liquid tank 1 is used to store liquid nitrogen. This means is a prior art and will not be described in detail here. In this embodiment, two liquid level sensors are also installed in the liquid tank 1, and the two liquid level sensors are respectively used to detect the high and low liquid levels in the liquid tank 1. The liquid level sensor is connected to the control unit 2 by signal. The liquid level sensor is the control basis of automatic liquid replenishment, and is used for automatic liquid replenishment when the liquid level in the liquid tank 1 is low, and the liquid replenishment is stopped when the liquid level reaches the threshold height;

[0030] And a control unit 2, the temperature control unit and the on-off unit are electrically connected to the control unit 2, so that when the temperature of the liquid nitrogen is lower than the threshold value, the control unit 2 controls the on-off unit to open the liquid replenishment pipeline to replenish the liquid tank 1. That is to say, in the utility model, the control unit 2 is used to control the on-off unit in real time to realize automatic liquid replenishment of the liquid tank 1 without manual operation, thereby improving the convenience of replenishing the liquid tank 1. Such a control method will be described in detail later.

[0031] In some embodiments, the temperature control unit in the utility model includes a solenoid valve 3 and a gas-liquid separator 4 which are sequentially connected to the liquid replenishing pipeline, and the gas-liquid separator 4 is used to discharge the high-temperature liquid nitrogen in the liquid replenishing pipeline;

[0032] Wherein, a temperature sensor 5 is provided between the solenoid valve 1 3 and the gas-liquid separator 4 and at the inlet of the liquid tank 1 , and the solenoid valve 1 3 , the gas-liquid separator 4 and the temperature sensor 5 are all electrically connected to the control unit 2 .

[0033] Since the temperature of the liquid nitrogen replenishing pipeline assembly will be lowered at the initial stage of liquid nitrogen introduction, thereby causing the temperature of the liquid nitrogen to rise, when the value detected by the temperature sensor 5 is higher than the threshold, the liquid nitrogen will continue to be released into the atmosphere through the gas-liquid separator 4. When the value detected by the temperature sensor 5 is lower than the threshold, the information will be sent to the control unit 2. The control unit 2 closes the solenoid valve 3 and the gas-liquid separator 4 through the on-off unit to stop the discharge of high-temperature liquid nitrogen.

[0034] Furthermore, the on-off unit includes an electromagnetic valve 26 connected to the liquid replenishing pipeline, and the electromagnetic valve 26 is located in front of the inlet of the liquid tank 1, wherein the electromagnetic valve 26 is electrically connected to the control unit 2. Specifically, in this embodiment, the on-off control of the electromagnetic valve 26 is performed by the control unit 2 to realize the start and stop of the liquid replenishment of the liquid tank 1. When the electromagnetic valve 26 is opened, the liquid replenishment starts. Conversely, when the liquid level in the liquid tank 1 reaches the threshold height, the electromagnetic valve 26 is closed to stop the liquid replenishment.

[0035] Preferably, in order to ensure that the input liquid nitrogen pressure meets the pressure range required by the design, a pressure sensor 7 and a safety valve 8 are also installed on the liquid replenishment pipeline in the utility model. When the pressure sensor 7 detects that the input liquid nitrogen pressure is too high, the safety valve 8 is used to release the high-pressure liquid;

[0036] The pressure sensor 7 and the safety valve 8 are both electrically connected to the control unit 2. When the liquid nitrogen pressure in the infusion pipeline is controlled to meet the threshold value, the control unit 2 will execute the next step. Specifically, the above-mentioned threshold value is controlled by the pressure sensor 7. This means is a conventional technical means and will not be repeated.

[0037] In addition, in a further embodiment, two solenoid valves 26 are connected in sequence in the utility model, and a manual valve 1 9 is connected between the two ends of the two solenoid valves 26. By adopting the design of two solenoid valves 9 in the utility model, the closing function of the pipeline can be more thoroughly realized, and the problem of difficulty in shutting down the infusion pipeline due to damage of a single solenoid valve can be effectively avoided, so as to improve the stability of control of the infusion pipeline.

[0038] Furthermore, a manual valve 2 10 is connected between the two ends of the solenoid valve 1 3. In this embodiment, by adopting the design of manual valve 1 9 and manual valve 2 10, when the system suddenly loses power, the liquid tank 1 can be manually replenished through manual valve 1 9 and manual valve 2 10, and liquid nitrogen can be replenished into the liquid tank 1 to protect the safety of the sample in the container and avoid the problem of irreversible loss caused by damage to the precious sample. The manual and automatic combined design can better meet the actual use needs.

[0039] In other words, the utility model also includes a filtering unit 11, which is installed at the inlet end of the liquid infusion pipeline and is used to communicate with an external liquid nitrogen device. The filtering unit 11 is a liquid nitrogen filter, and the filtering unit 11 can filter impurities in the liquid nitrogen to prevent impurities from entering the pipeline and causing blockage and other problems.

[0040] Specifically, when in use, the filter unit 11 is connected to an external liquid nitrogen device, and liquid nitrogen enters the system, and the temperature is first detected by the solenoid valve 3 and the temperature sensor 5, and the gas-liquid separator 4 discharges the initial high-temperature liquid nitrogen. When the temperature is lower than the threshold, the solenoid valve 3 and the gas-liquid separator 4 are closed;

[0041] Open the two solenoid valves 26 on the liquid replenishment pipeline, and liquid nitrogen enters the liquid tank 1. The two liquid level sensors inside the liquid tank 1 are used to detect the high and low liquid levels respectively. When the liquid nitrogen reaches the position of the high liquid level sensor, the control unit 2 will close the solenoid valve 26 to stop supplying liquid. When the liquid level in the liquid tank 1 is lower than the low liquid level, the control unit 2 opens the solenoid valve 26 to supply liquid to the liquid tank 1, thereby realizing automatic liquid replenishment.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A liquid nitrogen tank automatic refilling system, characterized in that: include: The temperature control unit is installed on the liquid replenishment pipeline and is used to detect the temperature of liquid nitrogen at the initial stage of liquid nitrogen introduction. When the temperature exceeds a threshold, the liquid nitrogen is discharged into the atmosphere until the temperature is lower than the threshold and the discharge is stopped; An on-off unit is connected to the liquid infusion pipeline, and is used to control the on and off of the liquid infusion pipeline. A liquid tank is also connected to the output end of the on-off unit; and a control unit, wherein the temperature control unit and the on-off unit are both electrically connected to the control unit, so that when the temperature of the liquid nitrogen is lower than a threshold value, the control unit controls the on-off unit to open the liquid replenishing pipeline to replenish the liquid tank.

2. The automatic liquid replenishing system for a liquid nitrogen tank according to claim 1, characterized in that: The temperature control unit comprises a solenoid valve 1 and a gas-liquid separator which are sequentially connected to the liquid replenishing pipeline, and the gas-liquid separator is used to discharge the high-temperature liquid nitrogen in the liquid replenishing pipeline; Wherein, temperature sensors are arranged between the solenoid valve 1 and the gas-liquid separator and at the inlet of the liquid tank, and the solenoid valve 1, the gas-liquid separator and the temperature sensor are all electrically connected to the control unit.

3. The automatic liquid replenishing system for a liquid nitrogen tank according to claim 2, characterized in that: The on-off unit includes a second solenoid valve connected to the liquid replenishing pipeline, and the second solenoid valve is located in front of the inlet of the liquid tank, wherein the second solenoid valve is electrically connected to the control unit.

4. The automatic liquid replenishing system for a liquid nitrogen tank according to claim 3, characterized in that: A pressure sensor and a safety valve are also installed on the liquid replenishment pipeline. When the pressure sensor detects that the input liquid nitrogen pressure is too high, the safety valve is used to release the high-pressure liquid; The pressure sensor and the safety valve are both electrically connected to the control unit.

5. The automatic liquid replenishing system for a liquid nitrogen tank according to claim 3, characterized in that: The solenoid valve 2 is connected in sequence with two of them.

6. The automatic liquid replenishing system for a liquid nitrogen tank according to claim 5, characterized in that: A manual valve 1 is also connected between the two ends of the two solenoid valves 2.

7. The automatic liquid replenishing system for a liquid nitrogen tank according to claim 6, characterized in that: A manual valve 2 is also connected between the two ends of the solenoid valve 1.

8. The automatic liquid replenishing system for a liquid nitrogen tank according to claim 1, characterized in that: It also includes a filter unit, which is installed at the inlet end of the liquid replenishing pipeline and is used to communicate with an external liquid nitrogen device.

9. The automatic liquid replenishing system for a liquid nitrogen tank according to claim 8, characterized in that: The filtering unit is a liquid nitrogen filter.

10. The automatic liquid replenishing system for a liquid nitrogen tank according to claim 1, characterized in that: Two liquid level sensors are also installed in the liquid tank. The two liquid level sensors are used to detect the high and low liquid levels in the liquid tank respectively. The liquid level sensors are connected to the control unit by signal.

Images