Automatic switching connection device for multi-self-pressurized liquid nitrogen tank and gas-phase liquid nitrogen tank

Abstract

The utility model relates to a kind of automatic switching connection device of multiple self-pressurizing liquid nitrogen tank and gas phase liquid nitrogen tank, including gas phase liquid nitrogen tank, multiple self-pressurizing liquid nitrogen tank, pipeline assembly, pressure detection module, electromagnetic switch valve and controller;The pipeline assembly includes main connecting pipeline and branch connecting pipeline;Multiple self-pressurizing liquid nitrogen tank is sequentially arranged along liquid supply direction, and the liquid outlet of each self-pressurizing liquid nitrogen tank is communicated with main connecting pipeline by a branch connecting pipeline, and the other end of main connecting pipeline is sealingly connected with the liquid inlet of gas phase liquid nitrogen tank.It realizes the automatic switching of multiple self-pressurizing liquid nitrogen tank and supplies, without manual monitoring and intervention, avoids liquid nitrogen supply interruption, and ensures the continuous operation of downstream equipment.

Description

Technical Field

[0001] This utility model belongs to the technical field, specifically an automatic switching connection device for multiple self-pressurizing liquid nitrogen tanks and gas phase liquid nitrogen tanks. Background Technology

[0002] In scientific research experiments and industrial production, gaseous liquid nitrogen tanks are often used as core storage devices, requiring a stable supply of liquid nitrogen at pressure. In existing technologies, gaseous liquid nitrogen tanks are typically connected to only a single self-pressurized liquid nitrogen tank as a replenishment source. When the liquid nitrogen in this self-pressurized tank is depleted, manual shutdown and replacement with a full tank are required. Failure to replace the tank in a timely manner can lead to an interruption in the liquid nitrogen supply, affecting the operation of the gaseous liquid nitrogen tank. If multiple self-pressurized liquid nitrogen tanks are connected in parallel, there is a lack of an automatic mechanism for identifying and switching empty tanks, still requiring manual monitoring of the liquid level. This operation is cumbersome and prone to supply interruptions due to human error, while also resulting in liquid nitrogen waste and unstable pressure.

[0003] Although there are some fluid medium switching devices in the existing technology, ordinary switching devices have defects such as poor sealing performance, easy failure of components at low temperature, and slow switching response, which are not suitable for the special requirements of liquid nitrogen transportation due to the low temperature characteristics (-196℃), low boiling point, and easy vaporization of liquid nitrogen.

[0004] Therefore, there is an urgent need for a device that can efficiently connect multiple self-pressurized liquid nitrogen tanks and gas phase liquid nitrogen tanks, and can automatically switch between empty tanks and ensure a continuous supply of liquid nitrogen. Utility Model Content

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0006] Given the following technical problems in the existing technology: Although there are some fluid medium switching devices in the existing technology, ordinary switching devices have defects such as poor sealing performance, easy failure of components at low temperature, and slow switching response, which are not suitable for the special requirements of liquid nitrogen transportation due to the low temperature characteristics (-196℃), low boiling point, and easy vaporization of liquid nitrogen.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an automatic switching connection device for multiple self-pressurized liquid nitrogen tanks and gas phase liquid nitrogen tanks, including a gas phase liquid nitrogen tank, multiple self-pressurized liquid nitrogen tanks, pipeline components, a pressure detection module, an electromagnetic switching valve, and a controller;

[0008] The piping assembly includes a main connecting pipe and branch connecting pipes;

[0009] Multiple self-pressurized liquid nitrogen tanks are arranged sequentially along the liquid supply direction. The outlet of each self-pressurized liquid nitrogen tank is connected to the main connecting pipeline through a branch connecting pipeline. The other end of the main connecting pipeline is sealed to the inlet of the gas phase liquid nitrogen tank.

[0010] Each of the branch connection pipes is equipped with an electromagnetic switching valve in series, wherein the electromagnetic switching valve is a low-temperature corrosion resistant type, and each of the branch connection pipes is connected to the controller signal.

[0011] The pressure detection module includes a main pressure sensor and branch pressure sensors. The main pressure sensor is installed on the main connecting pipeline, and the branch pressure sensors are installed on each branch connecting pipeline. The main pressure sensor and the branch pressure sensors are used to detect the pressure in each pipeline, and each pressure sensor is connected to the controller signal.

[0012] The controller has a built-in control program that receives detection signals from various pressure sensors and controls the opening and closing of the electromagnetic switching valve.

[0013] As a preferred technical solution for an automatic switching connection device for multiple self-pressurized liquid nitrogen tanks and gas phase liquid nitrogen tanks, the number of self-pressurized liquid nitrogen tanks installed is at least two.

[0014] As a preferred technical solution for an automatic switching connection device for multiple self-pressurized liquid nitrogen tanks and gas phase liquid nitrogen tanks, the outlet of the self-pressurized liquid nitrogen tank is fixed to one end of the branch connection pipeline by a clamp joint, the other end of the branch connection pipeline is welded to the main connection pipeline, and the main connection pipeline is connected to the inlet of the gas phase liquid nitrogen tank by a flange, wherein all connection nodes are equipped with cryogenic sealing gaskets.

[0015] As a preferred technical solution for an automatic switching connection device between multiple self-pressurized liquid nitrogen tanks and gas phase liquid nitrogen tanks, the main pressure sensor and the branch pressure sensor are both connected to the corresponding pipelines through threaded interfaces, and the signal output terminals of the main pressure sensor and the branch pressure sensor are connected to the controller through wires.

[0016] As a preferred technical solution for an automatic switching connection device between multiple self-pressurized liquid nitrogen tanks and gas phase liquid nitrogen tanks, the electromagnetic switching valve is connected in series in the middle of the branch connection pipeline, and its control end is connected to the controller through a wire.

[0017] The beneficial effects of this utility model are:

[0018] 1. Enables automatic switching and replenishment of multiple self-pressurized liquid nitrogen tanks without manual monitoring or intervention, avoiding interruptions in liquid nitrogen supply and ensuring continuous operation of downstream equipment;

[0019] 2. All pipeline connection nodes use low-temperature corrosion-resistant sealing components, which are adapted to the low-temperature characteristics of liquid nitrogen, have good sealing performance, and prevent liquid nitrogen leakage and waste;

[0020] 3. The pressure detection signal controls the switching, with a rapid switching response (≤1 second) and can avoid false switching, thus improving system reliability;

[0021] 4. The controller adjusts the liquid supply pressure in real time to ensure that the inlet pressure of the gas phase liquid nitrogen tank is stable and meets the operating requirements of downstream equipment.

[0022] 5. Compact structure, multiple self-pressurized liquid nitrogen tanks can be arranged in parallel, saving installation space and adapting to different site requirements;

[0023] 6. It is compatible with self-pressurized liquid nitrogen tanks and gas phase liquid nitrogen tanks of different specifications, has strong versatility, and can be widely used in scientific research, industry and other fields;

[0024] 7. Compared to liquid nitrogen towers, it is cheaper and more flexible.

[0025] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0027] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0028] Reference numerals: 100, gas phase liquid nitrogen tank; 200, self-pressurized liquid nitrogen tank; 300, piping assembly; 300a, main connection pipeline; 300b, branch connection pipeline; 400, pressure detection module; 400a, main line pressure sensor; 400b, branch line pressure sensor; 500, solenoid switching valve; 600, controller. Detailed Implementation

[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0032] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0033] Example, refer to Figure 1 An automatic switching connection device for multiple self-pressurized liquid nitrogen tanks and gas phase liquid nitrogen tanks includes a gas phase liquid nitrogen tank 100, multiple self-pressurized liquid nitrogen tanks 200, a pipeline assembly 300, a pressure detection module 400, an electromagnetic switching valve 500, and a controller 600.

[0034] In this scheme, a 200L gas phase liquid nitrogen tank 100 with a working pressure of 0.3~0.6MPa and model DQ-200 is selected;

[0035] At least two self-pressurized liquid nitrogen tanks 200 are required. In this scheme, three self-pressurized liquid nitrogen tanks 200 with a volume of 50L are selected. Their working pressure is 0.2~0.8MPa, and their low temperature resistance is -196℃. The model is YDS-50B.

[0036] Piping assembly 300 includes a main connecting pipe 300a and a branch connecting pipe 300b;

[0037] Multiple self-pressurized liquid nitrogen tanks 200 are arranged sequentially along the liquid supply direction. The outlet of each self-pressurized liquid nitrogen tank 200 is connected to the main connecting pipe 300a through a branch connecting pipe 300b. Both the main connecting pipe 300a and the branch connecting pipe 300b are made of 304 stainless steel. The main pipe diameter is φ25mm, the branch pipe diameter is φ15mm, and the pipe wall thickness is 3mm, which is suitable for low temperature environments. The other end of the main connecting pipe 300a is sealed to the inlet of the gas phase liquid nitrogen tank 100.

[0038] The outlet of the self-pressurized liquid nitrogen tank 200 is fixed to one end of the branch connection pipe 300b by a clamp joint. The other end of the branch connection pipe 300b is welded to the main connection pipe 300a. The main connection pipe 300a is connected to the inlet of the gas phase liquid nitrogen tank 100 by a flange. All connection nodes are equipped with cryogenic sealing gaskets.

[0039] Each branch connection pipe 300b is connected in series with an electromagnetic switching valve 500. The electromagnetic switching valve 500 is a low-temperature corrosion resistant type, which is a low-temperature electromagnetic ball valve, model Q22HD-15, with a temperature range of -200℃ to 80℃, a nominal pressure of 1.6MPa, and a nominal diameter of 15mm. Each branch connection pipe 300b is also connected to the controller 600 for signal connection.

[0040] The electromagnetic switching valve 500 is connected in series in the middle of the branch connection pipe 300b, and its control end is connected to the controller 600 through a wire.

[0041] The pressure detection module 400 includes a main pressure sensor 400a and a branch pressure sensor 400b. Both are diffused silicon pressure sensors, model PTG501, with a measurement range of 0–1.0 MPa, accuracy of ±0.2% FS, and temperature resistance of -40℃ to 85℃. The main pressure sensor 400a is installed on the main connecting pipe 300a, and the branch pressure sensors 400b are installed on each branch connecting pipe 300b. The main pressure sensor 400a and branch pressure sensors 400b are used to detect the pressure in each pipe. Each pressure sensor is connected to the controller 600 via a signal connection.

[0042] The controller 600 has a built-in control program to receive detection signals from various pressure sensors and control the on / off state of the solenoid switching valve 500. It uses a PLC controller, model S7-200SMART, with a built-in switching control program and a touch screen for setting thresholds and displaying operating conditions.

[0043] Both the main pressure sensor 400a and the branch pressure sensor 400b are connected to the corresponding pipelines via threaded interfaces. The signal output terminals of the main pressure sensor 400a and the branch pressure sensor 400b are connected to the controller 600 via wires.

[0044] This implementation will achieve the following:

[0045] 1. Installation: Arrange three self-pressurized liquid nitrogen tanks 200 in parallel with a spacing of 50cm. The main connecting pipe 300a is arranged along the top of the tank body. The outlet of each self-pressurized liquid nitrogen tank 200 is connected to the main connecting pipe 300a through a branch connecting pipe 300b. All connection nodes are fixed with clamps and sealed with gaskets. The main pressure sensor 400a and the branch pressure sensor 400b are installed in the middle of the main connecting pipe 300a and near the electromagnetic switching valve 500 on each branch connecting pipe 300, respectively. The controller 600 is installed on a bracket for easy operation and is connected to all sensors and the electromagnetic switching valve 500 through wires.

[0046] II. Debugging:

[0047] ① Setting parameters: Set the "empty tank threshold" liquid supply pressure range to 0.3~0.5MPa and the switching delay time to 0.8 seconds via the touch screen;

[0048] ② Trial operation: Inject liquid nitrogen into the three self-pressurized liquid nitrogen tanks 200, filling each to 50L. The controller 600 controls the electromagnetic switching valve 500 of the first self-pressurized liquid nitrogen tank 200 to open, and the others to close. Observe whether the liquid nitrogen is normally delivered to the gas phase liquid nitrogen tank 100 and whether the pressure is stable within the set range.

[0049] ③ Switching Test: When the liquid nitrogen level in the first self-pressurized liquid nitrogen tank 200 is lower than 5L, the branch pressure sensor 400b sends a "pressure abnormality signal". After receiving the signal, the controller 600 closes the first solenoid switching valve 500 and opens the second solenoid switching valve 500 after a delay of 0.8 seconds. Observe whether the switching process is smooth and whether the pressure fluctuates significantly. Repeat the test until the third self-pressurized liquid nitrogen tank 200 is supplied with liquid to confirm that the switching function is reliable.

[0050] ④ Alarm test: When the liquid level in the third self-pressurized liquid nitrogen tank is below the threshold, the controller 600 will activate an audible and visual alarm to remind staff to replace the tank with a full one. The alarm function is tested and found to be normal.

[0051] It should be understood that numerous specific implementation decisions can be made during the development of any actual implementation method, and in any engineering or design project. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, the development effort will be a routine task in design, manufacturing, and production without requiring extensive experimentation.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An automatic switching connection device for multiple self-pressurized liquid nitrogen tanks and gas phase liquid nitrogen tanks, characterized in that: Includes a gas phase liquid nitrogen tank (100), multiple self-pressurized liquid nitrogen tanks (200), piping assembly (300), pressure detection module (400), electromagnetic switching valve (500) and controller (600); The piping assembly (300) includes a main connecting pipe (300a) and a branch connecting pipe (300b); Multiple self-pressurized liquid nitrogen tanks (200) are arranged sequentially along the liquid supply direction. The outlet of each self-pressurized liquid nitrogen tank (200) is connected to the main connecting pipe (300a) through a branch connecting pipe (300b). The other end of the main connecting pipe (300a) is sealed to the inlet of the gas phase liquid nitrogen tank (100). Each of the branch connection pipes (300b) is connected in series with an electromagnetic switching valve (500), and each of the branch connection pipes (300b) is signal-connected to the controller (600); The pressure detection module (400) includes a main pressure sensor (400a) and a branch pressure sensor (400b). The main pressure sensor (400a) is installed on the main connecting pipeline (300a), and the branch pressure sensors (400b) are respectively installed on each branch connecting pipeline (300b). The main pressure sensor (400a) and the branch pressure sensor (400b) are used to detect the pressure in each pipeline. Each pressure sensor is signal-connected to the controller (600).

2. The automatic switching connection device between the multi-self-pressurized liquid nitrogen tank and the gas phase liquid nitrogen tank according to claim 1, characterized in that: The number of self-pressurized liquid nitrogen tanks (200) installed is at least two.

3. The automatic switching connection device between the multi-self-pressurized liquid nitrogen tank and the gas phase liquid nitrogen tank according to claim 1, characterized in that: The outlet of the self-pressurized liquid nitrogen tank (200) is fixed to one end of the branch connecting pipe (300b) by a clamp joint, and the other end of the branch connecting pipe (300b) is welded to the main connecting pipe (300a). The main connecting pipe (300a) is connected to the inlet of the gas phase liquid nitrogen tank (100) by a flange.

4. The automatic switching connection device between the multi-self-pressurized liquid nitrogen tank and the gas phase liquid nitrogen tank according to claim 1, characterized in that: The main pressure sensor (400a) and the branch pressure sensor (400b) are both connected to the corresponding pipelines via threaded interfaces. The signal output terminals of the main pressure sensor (400a) and the branch pressure sensor (400b) are connected to the controller (600) via wires.

5. The automatic switching connection device between the multi-self-pressurized liquid nitrogen tank and the gas phase liquid nitrogen tank according to claim 1, characterized in that: The electromagnetic switching valve (500) is connected in series in the middle of the branch connection pipeline (300b), and its control end is connected to the controller (600) through a wire.

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