Automatic pneumatic control system for liquid nitrogen tank

Abstract

The utility model relates to the technical field of ultralow-temperature storage, in particular to an automatic pneumatic control system for a liquid nitrogen tank, which at least comprises a filtering unit, a control unit and a control unit, the exhaust unit is communicated with a gas path of the filtering unit and continuously exhausts gas to the automatic operation area so as to maintain the micro-positive pressure of the automatic operation area; according to the utility model, micro-positive pressure dry air is utilized to avoid the problem that low-temperature elements in an automatic operation area are easy to freeze, so that automatic faults caused by freezing are reduced, and a guarantee is provided for long endurance of equipment; besides, a buffer container in the system is an important device for maintaining the pressure of the system stable, and can ensure normal operation of automation for a period of time when compressed air is cut off from the outside, so that the sample is prevented from falling into a storage area, and catastrophic consequences are prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of ultra-low temperature storage, in particular to an automatic pneumatic control system for a liquid nitrogen tank. Background Art

[0002] At present, more and more automated liquid nitrogen tanks are used for biological sample storage. Conventional automated liquid nitrogen tanks are equipped with a turntable inside, which is divided into multiple sectors. An externally mounted drive device is connected to the turntable output shaft to drive the turntable to rotate, so that the target sector is rotated to the sector-shaped outlet of the liquid nitrogen tank, thereby facilitating the storage and retrieval of samples.

[0003] Traditional automated liquid nitrogen tanks have certain drawbacks. For example, low-temperature components in the automated operation area are prone to freezing, which can lead to equipment failure. Secondly, the execution units of current automated liquid nitrogen tanks are mostly directly connected to external compressed air. When the compressed air at the air inlet is cut off, the execution unit stops working, resulting in failure in moving and clamping the sample. If the sample falls into the storage area, catastrophic consequences will occur.

[0004] Based on this, we propose an automated liquid nitrogen tank pneumatic control system to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to solve the above-mentioned shortcomings in the prior art and to propose an automatic liquid nitrogen tank pneumatic control system.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] Design an automated liquid nitrogen tank pneumatic control system, including at least:

[0008] The filter unit is used to separate the oil and water in the compressed air and provide dry compressed air;

[0009] An exhaust unit is connected to the filter unit gas path and continuously exhausts air to the automated operation area to maintain a slight positive pressure in the automated operation area;

[0010] A pressure stabilizing unit is connected to the filter unit in an air path, wherein an execution unit is connected to the output end of the pressure stabilizing unit, and a pressure detection unit is also provided at the air inlet of the filter unit and the air outlet of the pressure stabilizing unit;

[0011] It also includes a control system, which is connected to the pressure detection unit and the execution unit by signal.

[0012] Furthermore, the exhaust unit includes a flow valve connected to the air path of the filter unit, and a respirator is also connected to the output end of the flow valve. The respirator is used as a nozzle for spraying dry air into the automated operation area.

[0013] Furthermore, the pressure stabilizing unit includes a cache container, and the cache container is connected to the filter unit pipeline, wherein the pressure detection unit is connected to the cache container.

[0014] Furthermore, a one-way valve is installed on the connecting pipeline between the cache container and the filter unit.

[0015] Furthermore, the execution unit includes at least one moving cylinder, which is connected to the gas path of the cache container. At least one solenoid valve is installed on the gas path of the moving cylinder and the cache container, and the solenoid valve is connected to the control system signal.

[0016] Further, it also includes a pressure regulating valve;

[0017] The pressure regulating valve is used to regulate the air pressure entering the moving cylinder, and the pressure regulating valve is installed on the pipeline between the buffer container and the solenoid valve.

[0018] Furthermore, the pressure detection unit is a pressure sensor.

[0019] The utility model proposes an automated pneumatic control system for liquid nitrogen tanks, which has the following beneficial effects:

[0020] The utility model utilizes slightly positive pressure dry air to avoid the problem of easy icing of low-temperature components in the automation operation area, reduces automation failures caused by icing, and provides guarantee for the long life of the equipment;

[0021] In addition, the buffer container in the system is not only an important device for maintaining the stability of the system pressure, but also can ensure the normal operation of the automation for a period of time when the compressed air is cut off externally, preventing samples from falling into the storage area and causing catastrophic consequences. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the utility model.

[0023] In the figure: 1. Filter unit; 2. Pressure detection unit; 3. Control system; 4. Flow valve; 5. Respirator; 6. Buffer container; 7. One-way valve; 8. Motion cylinder; 9. Solenoid valve; 10. Pressure regulating valve. DETAILED DESCRIPTION

[0024] 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.

[0025] Reference Figure 1 An embodiment of the utility model discloses an automated liquid nitrogen tank pneumatic control system, which is installed in an automated liquid nitrogen tank device and is used to solve the problem in the prior art that low-temperature components in the automated operation area are prone to freezing, and that the motion cylinder immediately shuts down when the compressed air is cut off.

[0026] The control system at least includes a filter unit 1, which is used to separate the oil and water in the compressed air and provide dry compressed air, that is, the oil and water in the compressed gas are separated by the filter unit 1 to ensure the dryness of the compressed air pressure and prevent the external wet air from entering the equipment;

[0027] and an exhaust unit, which is connected to the filter unit 1 in an air path and continuously exhausts air to the automated operation area to maintain a slight positive pressure in the automated operation area. At the same time, since the blown gas is dry gas, it can effectively alleviate the icing of low-temperature components in the automated operation area and ensure the normal working ability of the low-temperature components;

[0028] In addition, the utility model also has a pressure stabilizing unit, which is connected to the filter unit 1 in an air path, wherein an execution unit is connected to the output end of the pressure stabilizing unit, and a pressure detection unit 2 is also provided at the air inlet of the filter unit 1 and the air outlet of the pressure stabilizing unit. In some embodiments, the pressure detection unit 2 in the utility model is provided as a pressure sensor to detect the air pressure of the corresponding parts respectively;

[0029] Furthermore, the voltage stabilizing unit is used to stabilize the air intake pressure of the execution unit. When the compressed air at the air intake end is cut off, it can continue to provide a certain amount of time pressure to the execution unit to prevent the sample from falling into the storage area and causing catastrophic consequences. The specific voltage stabilization method will be described in detail later.

[0030] Of course, in order to achieve the automatic control effect, the utility model also includes a control system 3, which is connected to the pressure detection unit 2 and the execution unit signal. The control system 3 is used to detect the air pressure of the gas circuit and control the start and stop of the gas circuit on the above-mentioned execution unit.

[0031] In some embodiments, the exhaust unit of the utility model includes a flow valve 4 connected to the air path of the filter unit, and the flow valve 4 is used to adjust the flow of dry air so that it can ensure that the automated operation area maintains a slight positive pressure and prevents external humid air from entering, causing the low-temperature components to freeze;

[0032] A respirator 5 is also connected to the output end of the flow valve 4. The respirator 5 is used as a nozzle for spraying dry air into the automated operation area. The respirator 5 and the flow valve 4 together ensure a slight positive pressure in the automated operation area.

[0033] Furthermore, the pressure stabilizing unit includes a buffer container 6, which is connected to the filter unit 1 by a pipeline. A certain amount of dry air is stored in the buffer container 6, which is an important part of the backup system. When the external compressed air is suddenly cut off, the air in the buffer container 6 can still ensure that the automated mechanical gripper can operate for a considerable period of time to ensure that the key action is completed; in addition, the buffer tank can filter out the pressure fluctuations of the external air source, so that the pressure of the entire system is in a stable state.

[0034] Wherein, the pressure detection unit 2 is connected to the cache container 6 .

[0035] A one-way valve 7 is also installed on the connecting pipeline between the buffer container 6 and the filter unit 1. The one-way valve 7 ensures that the gas in the buffer container 6 can only enter from the inlet and be discharged from the outlet, thereby avoiding gas backflow.

[0036] On the basis of the above-mentioned embodiment, the execution unit in the utility model includes at least one motion cylinder 8, which is driven by compressed air to realize the normal operation of the manipulator, such as moving up and down or moving left and right; in addition, the motion cylinder 8 can also drive the mechanical gripper to realize the pinching and releasing actions, and the number of motion cylinders 8 can be set by skilled technicians according to actual needs, and will not be described in detail here;

[0037] The moving cylinder 8 is connected to the gas circuit of the cache container 6. At least one solenoid valve 9 is installed on the gas circuit of the moving cylinder 8 and the cache container 6. The solenoid valve 9 is connected to the control system 3 signal. The number of solenoid valves 9 is consistent with the number of moving cylinders 8, and they are connected to each other. The solenoid valve 9 disconnects or closes the designated gas circuit according to the requirements of the control system 3 to realize the corresponding movement of the moving cylinder 8 and the movement of the automated gripper.

[0038] The gas circuit also includes a pressure regulating valve 10;

[0039] The pressure regulating valve 10 is used to regulate the air pressure entering the moving cylinder 8 , and the pressure regulating valve 10 is installed on the pipeline between the buffer container 6 and the solenoid valve 9 .

[0040] It should be noted that the above components are linked together through air pipes in a systematic order and are scattered at various positions of the product.

[0041] In summary, the utility model utilizes slightly positive pressure dry air to avoid the problem of easy icing of low-temperature components in the automation operation area, reduces automation failures caused by icing, and provides a guarantee for the long life of the equipment;

[0042] In addition, the buffer container 6 in the system is not only an important device for maintaining the stability of the system pressure, but also can ensure the normal operation of the automation for a period of time when the compressed air is cut off externally, preventing the sample from falling into the storage area and causing catastrophic consequences.

[0043] 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. An automated liquid nitrogen tank pneumatic control system, characterized in that: At least: A filter unit (1) is used to separate oil and water in the compressed air to provide dry compressed air; An exhaust unit is connected to the filter unit (1) through an air path and continuously exhausts air to the automated operation area to maintain a slight positive pressure in the automated operation area; A pressure stabilizing unit is connected to the filter unit (1) in an air path, wherein an execution unit is connected to the output end of the pressure stabilizing unit, and a pressure detection unit (2) is also provided at the air inlet of the filter unit (1) and the air outlet of the pressure stabilizing unit; It also comprises a control system (3), wherein the control system (3) is signal-connected to the pressure detection unit (2) and the execution unit.

2. An automated liquid nitrogen tank pneumatic control system according to claim 1, characterized in that: The exhaust unit comprises a flow valve (4) connected to the air path of the filter unit. The output end of the flow valve (4) is also connected to a respirator (5). The respirator (5) is used as a nozzle for spraying dry air into the automated operation area.

3. An automated liquid nitrogen tank pneumatic control system according to claim 1 or 2, characterized in that: The pressure stabilizing unit comprises a buffer container (6), the buffer container (6) being in pipeline communication with the filter unit (1), wherein the pressure detection unit (2) is in communication with the buffer container (6).

4. The automatic liquid nitrogen tank pneumatic control system according to claim 3 is characterized in that: A one-way valve (7) is also installed on the connecting pipeline between the cache container (6) and the filter unit (1).

5. The automatic liquid nitrogen tank pneumatic control system according to claim 3 is characterized in that: The execution unit comprises at least one moving cylinder (8), the moving cylinder (8) being connected to the buffer container (6) by air circuit, and at least one solenoid valve (9) being installed on the air circuit between the moving cylinder (8) and the buffer container (6), and the solenoid valve (9) being connected to the control system (3) by signal.

6. An automated liquid nitrogen tank pneumatic control system according to claim 5, characterized in that: Also includes a pressure regulating valve (10); The pressure regulating valve (10) is used to regulate the air pressure entering the moving cylinder (8), and the pressure regulating valve (10) is installed on the pipeline between the buffer container (6) and the solenoid valve (9).

7. The automatic liquid nitrogen tank pneumatic control system according to claim 1 is characterized in that: The pressure detection unit (2) is a pressure sensor.

Images