An automatically regulated water bath liquid nitrogen vaporizer

Abstract

The utility model discloses an automatic regulation's water bath type liquid nitrogen vaporizer, including water bath box, electric heater, steam heat exchange pipe, liquid nitrogen delivery pipe, liquid nitrogen heat exchange pipe, liquid nitrogen vaporization device, the liquid nitrogen vaporization device still include liquid nitrogen vaporization cylinder, steam connecting pipe, liquid nitrogen connecting pipe. The utility model's function is when electric heater or steam heating appears the breakdown, provides the buffer effect, reduces the influence of pressure fluctuation caused by the breakdown to pipeline element, cooperates production workshop control cabinet DCS control system, promotes the reliability and safety of device, reduces the influence of nitrogen to liquid nitrogen pipeline simultaneously, increases the heat exchange area of liquid nitrogen and hot water in water bath box, improves the vaporization efficiency of liquid nitrogen.

Description

Technical Field

[0001] This utility model belongs to the field of vaporizer technology, and in particular relates to an automatically adjustable water bath liquid nitrogen vaporizer. Background Technology

[0002] A water bath liquid nitrogen vaporizer is a specialized device that uses water as a heat exchange medium to rapidly vaporize cryogenic liquid nitrogen (-196℃) into room-temperature nitrogen gas. It is widely used in chemical, air separation, metallurgy, and medical fields. Its core design leverages the heat capacity of water to achieve efficient heat exchange, while also featuring stable operation and low energy consumption.

[0003] The prior art, such as the electrically heated water bath vaporizer for processing liquid nitrogen disclosed in Chinese Patent (CN211551156U), includes: a housing, a water injection pipe, an exhaust pipe, a first heat exchange tube, a cover plate, an electric heating tube, a second heat exchange tube, and a control valve. The housing is used to store water, with an opening at the top and a water injection port and an exhaust port on the side wall of the housing. The water injection pipe is connected to the water injection port on the outer side wall of the housing. The exhaust pipe is connected to the exhaust port on the outer side wall of the housing. Liquid nitrogen is injected into the first heat exchange tube, which passes through the housing. The cover plate is placed on the top of the housing. The electric heating tube is connected to a power source and is placed in the water inside the housing. The second heat exchange tube contains steam, similar to that in a steam water bath vaporizer, and passes through the housing.

[0004] This method has the following drawbacks: First, when the heating system suddenly changes, there is a time interval between the switching of heat exchange vaporization modes between different heat exchange systems to maintain the original temperature. During steam-water bath heat exchange, steam enters the heat exchange tubes and needs to transfer heat through the tubes to the heating water to reach equilibrium and maintain the original temperature. Similarly, when the heater starts, the electric heating tube also needs time to raise its temperature to maintain the existing operating temperature. During this time interval, due to the lack of a buffer device, the nitrogen inside the device will experience pressure fluctuations due to a temporary drop in temperature, leading to subsequent pressure fluctuations in the gas supply. These pressure fluctuations not only cause vibrations and reduce the lifespan of pipe components, but also... First, it may damage subsequently connected equipment. Second, after the liquid nitrogen in the device is heated by the heat exchange tubes inside the device, when the water temperature inside the device is high, the vaporized liquid nitrogen at the rear end of the heat exchange tubes will be converted into nitrogen gas, which will increase the pressure and block the liquid nitrogen in the heat exchange tubes from flowing backward. This will cause the nitrogen gas to force the liquid nitrogen to flow back, reducing the vaporization efficiency of the device. Third, the device raises the temperature of liquid nitrogen by heating the heat exchange tubes in a water bath. However, the heat exchange tubes inside the device are made of a straight tube to exchange heat between the liquid nitrogen and the hot water. This heat exchange method results in a small heat exchange area and low heat exchange efficiency. The liquid nitrogen is not heated sufficiently, and there is no way to prevent the liquid nitrogen from flowing back, which reduces the reliability of the device.

[0005] Therefore, this utility model provides an automatically adjustable water bath liquid nitrogen vaporizer. Utility Model Content

[0006] To address the aforementioned technical problems, this utility model discloses an automatically adjustable water bath liquid nitrogen vaporizer. When the electric heater or steam heater malfunctions, it provides a buffering effect, reducing the impact of pressure fluctuations caused by the malfunction on pipeline components. Combined with the DCS control system in the production workshop control cabinet, it enhances the reliability and safety of the device. Simultaneously, it reduces the impact of nitrogen on the liquid nitrogen pipeline, increases the heat exchange area between liquid nitrogen and the hot water in the water bath, and improves the vaporization efficiency of liquid nitrogen.

[0007] To achieve the above-mentioned technical effects, this utility model provides an automatically adjustable water bath type liquid nitrogen vaporizer, including a water bath, an electric heater, a steam heat exchange tube, a liquid nitrogen delivery pipe, a liquid nitrogen heat exchange tube, and a liquid nitrogen vaporization device. The water bath is located to the left of the liquid nitrogen vaporization device, the electric heater is located inside and below the water bath, the steam heat exchange tube is located above the electric heater, the liquid nitrogen delivery pipe is located to the left of the water bath, and the liquid nitrogen heat exchange tube is located between the electric heater and the steam heat exchange tube, with its left side connected to the liquid nitrogen delivery pipe. The water bath, electric heater, steam heat exchanger, liquid nitrogen delivery pipe, liquid nitrogen heat exchanger, and liquid nitrogen vaporization device are all electrically connected to the production workshop control cabinet. The liquid nitrogen vaporization device also includes a liquid nitrogen vaporization cylinder, a steam connection pipe, and a liquid nitrogen connection pipe. The liquid nitrogen vaporization cylinder is located on the right side of the water bath, and the steam connection pipe is located on the left side of the liquid nitrogen vaporization cylinder. The left end of the steam connection pipe is connected to the steam heat exchanger inside the water bath, and the liquid nitrogen connection pipe is located on the left side of the liquid nitrogen vaporization cylinder. The left end of the liquid nitrogen connection pipe is connected to the outlet of the liquid nitrogen heat exchanger inside the water bath.

[0008] Preferably, the liquid nitrogen heat exchange tube is configured as a coil structure.

[0009] Preferably, the liquid nitrogen vaporization cylinder further includes an insulating shell, a heating coil, a nitrogen outlet pipe, a liquid nitrogen inlet pipe, and a steam inlet pipe. The heating coil is located inside the insulating shell, the nitrogen outlet pipe is located above the insulating shell, the liquid nitrogen inlet pipe is located on the left side of the insulating shell, and the steam inlet pipe is located above the inscription shell.

[0010] Preferably, insulation material is provided between the heat-insulating outer shell and the heating coil.

[0011] Preferably, a temperature sensor a and a pressure sensor a are provided on the top of the heat-insulating shell.

[0012] Preferably, a liquid level sensor is provided on the front side of the heat-insulating shell.

[0013] Preferably, the height of the upper tube seat of the liquid level sensor is below the liquid nitrogen inlet pipe.

[0014] Preferably, the liquid nitrogen connecting pipe is also equipped with an electric valve a and a check valve.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This device is equipped with a liquid nitrogen vaporization unit, which allows heated liquid nitrogen to increase its volume and vaporize within the cylinder space, thus supplying nitrogen gas externally. In the event of a malfunction in the electric heater or steam heater, the liquid nitrogen vaporization cylinder can still ensure that the liquid nitrogen continues to vaporize under the insulation effect within the cylinder, reducing the impact of pressure fluctuations caused by the malfunction on piping components. In conjunction with the DCS control system in the production workshop, it automatically performs pre-judgment and adjustment under near-accident conditions, ensuring that the device does not enter an accident state. This significantly reduces the occurrence of manual operation errors, deviations from indicators not detected by operators in a timely manner, and interlocking events, improving the reliability and safety of the device. Simultaneously, it can promptly discharge the vaporized nitrogen through the nitrogen outlet pipe, reducing the impact of nitrogen on the liquid nitrogen pipeline and ensuring the vaporization efficiency of the device. The liquid nitrogen heat exchange tubes with a coil structure increase the heat exchange area between the liquid nitrogen and the hot water in the water bath, further improving the vaporization efficiency of the liquid nitrogen. Attached Figure Description

[0017] Figure 1 This is a front view of the present invention;

[0018] Figure 2 This is an isometric view of the present invention;

[0019] Figure 3 This is the left view of this utility model;

[0020] Figure 4 yes Figure 3 A sectional view of section a.

[0021] The attached diagram lists the components represented by each number as follows:

[0022] 1. Water bath; 2. Electric heater; 3. Steam heat exchanger tube; 4. Liquid nitrogen delivery tube; 5. Liquid nitrogen heat exchanger tube; 6. Liquid nitrogen vaporization device; 7. Liquid nitrogen vaporization cylinder; 8. Steam connection pipe; 9. Liquid nitrogen connection pipe; 10. Insulation shell; 11. Heating coil; 12. Nitrogen outlet pipe; 13. Liquid nitrogen inlet pipe; 14. Steam inlet pipe; 15. Temperature sensor a; 16. Pressure sensor a; 17. Liquid level sensor; 18. Electric valve a; 19. Check valve; 20. Water inlet pipe; 21. Exhaust pipe; 22. Temperature sensor b; 23. Pressure sensor b. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] The prior art in this embodiment has the following problems: The inventors have discovered the following defects in the prior art: First, when the heating system suddenly changes, there is a time interval between the switching of heat exchange vaporization modes between different heat exchange systems to maintain the original temperature. During heat exchange in a steam-water bath, steam enters the heat exchange tube and needs to transfer heat through the heat exchange tube to the heating water to reach an equilibrium state to maintain the original temperature. When the heater starts heating, the electric heating tube also needs a certain amount of time to raise its own temperature to maintain the existing temperature. During this time interval, due to the lack of a buffer device, the nitrogen inside the device will experience pressure fluctuations due to a temporary drop in temperature, leading to pressure fluctuations in the subsequent gas supply. These pressure fluctuations cause vibration reduction. In addition to extending the lifespan of the piping components, it can also damage subsequently connected equipment; secondly, after the liquid nitrogen in the device is heated by the heat exchange tubes inside the device, when the water temperature inside the device is high, the vaporized liquid nitrogen at the rear end of the heat exchange tubes will convert into nitrogen gas, which will increase the pressure and block the liquid nitrogen in the heat exchange tubes from flowing backward. This will result in nitrogen gas forcing the liquid nitrogen to flow back, reducing the vaporization efficiency of the device; thirdly, the device raises the temperature of liquid nitrogen by heating the heat exchange tubes in a water bath. However, the heat exchange tubes inside the device are made of a straight tube to exchange heat between the liquid nitrogen and the hot water. This heat exchange method results in a small heat exchange area and low heat exchange efficiency. The liquid nitrogen is not heated sufficiently, and there is no measure to prevent the liquid nitrogen from flowing back, which reduces the reliability of the device.

[0025] Therefore, the inventor provides an automatically adjustable water bath type liquid nitrogen vaporizer, including a water bath 1, an electric heater 2, a steam heat exchange tube 3, a liquid nitrogen delivery pipe 4, a liquid nitrogen heat exchange tube 5, and a liquid nitrogen vaporization device 6. The water bath 1 is located to the left of the liquid nitrogen vaporization device 6, the electric heater 2 is located inside and below the water bath 1, the steam heat exchange tube 3 is located above the electric heater 2, the liquid nitrogen delivery pipe 4 is located to the left of the water bath 1, and the liquid nitrogen heat exchange tube 5 is located between the electric heater 2 and the steam heat exchange tube 3, with the left side of the liquid nitrogen heat exchange tube 5 connected to the liquid nitrogen delivery pipe 4. The water bath 1 and the electric heater 2... The steam heat exchanger 3, liquid nitrogen delivery pipe 4, liquid nitrogen heat exchanger 5, and liquid nitrogen vaporization device 6 are electrically connected to the production workshop control cabinet (not shown in the figure). The liquid nitrogen vaporization device 6 also includes a liquid nitrogen vaporization cylinder 7, a steam connection pipe 8, and a liquid nitrogen connection pipe 9. The liquid nitrogen vaporization cylinder 7 is located on the right side of the water bath 1, and the steam connection pipe 8 is located on the left side of the liquid nitrogen vaporization cylinder 7. The left end of the steam connection pipe 8 is connected to the steam heat exchanger 3 in the water bath 1, and the liquid nitrogen connection pipe 9 is located on the left side of the liquid nitrogen vaporization cylinder 7. The left end of the liquid nitrogen connection pipe 9 is connected to the outlet of the liquid nitrogen heat exchanger 5 in the water bath 1.

[0026] Using the above scheme, the electric heater 2 in the water bath 1 heats the liquid nitrogen by heating the water entering from the water inlet pipe 20 on the left side of the water bath 1. The steam generated by the heating water is discharged from the exhaust pipe 21 on the right side of the water bath 1. The liquid nitrogen is sent from the left side of the liquid nitrogen heat exchange pipe 5 through the liquid nitrogen delivery pipe 4. After heat exchange with the heating water, it enters the liquid nitrogen vaporization cylinder 7 from the liquid nitrogen delivery pipe 4 on the right. Then, it evaporates and vaporizes into nitrogen gas in the liquid nitrogen vaporization cylinder 7 and is discharged from the liquid nitrogen vaporization cylinder 7. During the heating process of liquid nitrogen in the water bath 1, the temperature sensor b22 and pressure sensor b23 installed on the water bath 1 monitor the temperature and pressure signals inside the water bath 1 in real time. The signals are transmitted to the control cabinet in the production workshop to control the opening and closing of the electric valves on each pipe.

[0027] Heating steam enters the liquid nitrogen vaporization cylinder 7 from the lower right side and heats and maintains the liquid nitrogen in the liquid nitrogen vaporization cylinder 7. After heating, the steam enters the steam heat exchange tube 3 in the water bath 1 through the steam connection pipe 8 to the left, heats the water in the water bath 1, and then exits from the left side of the water bath 1.

[0028] Furthermore, the liquid nitrogen heat exchange tube 5 is configured as a coil structure;

[0029] Among them, the liquid nitrogen heat exchange tube 5 with a coil structure can increase the heat exchange area between liquid nitrogen and hot water in the water bath 1, thereby improving the vaporization efficiency of liquid nitrogen.

[0030] Furthermore, the liquid nitrogen vaporization cylinder 7 also includes an insulation shell 10, a heating coil 11, a nitrogen outlet pipe 12, a liquid nitrogen inlet pipe 13, and a steam inlet pipe 14. The heating coil 11 is located inside the insulation shell 10, the nitrogen outlet pipe 12 is located above the insulation shell 10, the liquid nitrogen inlet pipe 13 is located on the left side of the insulation shell 10, and the steam inlet pipe 14 is located above the inscription shell.

[0031] In this process, liquid nitrogen is heated by hot water inside the water bath 1 and then enters the interior of the insulation shell 10 through the liquid nitrogen connecting pipe 9. After being heated, the liquid nitrogen vaporizes inside the insulation shell 10. The steam inlet pipe 14 introduces heating steam into the heating coil 11 to maintain the temperature inside the insulation shell 10 and ensure the vaporization efficiency of the liquid nitrogen. The vaporized nitrogen gas is then discharged from the nitrogen outlet pipe 12 above the insulation shell 10. The steam used by the heating coil 11 is transported to the steam heat exchanger tube of the water bath 1 through the steam connecting pipe 8 on the upper left side of the heating coil 11. The hot water in the heating water bath 1 is discharged from the left end of the steam heat exchange pipe 3 after heat exchange. By setting up a liquid nitrogen vaporization cylinder 7, the heated liquid nitrogen increases its volume in the cylinder space and vaporizes to transport nitrogen outward. In this way, when the electric heater 2 or the steam heater fails, the liquid nitrogen vaporization cylinder 7 can still ensure that the liquid nitrogen continues to vaporize under the heat preservation effect inside the cylinder, reducing the impact of pressure fluctuations caused by the failure on the pipeline components. At the same time, the vaporized nitrogen can also be discharged in time through the nitrogen outlet pipe 12, reducing the impact of nitrogen on the liquid nitrogen pipeline and ensuring the vaporization efficiency of the device.

[0032] Furthermore, an insulating material (not shown in the figure) is provided between the insulating outer shell 10 and the heating coil 11.

[0033] Among them, the thermal insulation material can ensure the continuous temperature inside the thermal insulation shell 10, ensure the normal progress of liquid nitrogen heating and vaporization, and improve the liquid nitrogen vaporization efficiency.

[0034] Furthermore, a temperature sensor a15 and a pressure sensor a16 are provided on the top of the heat insulation shell 10;

[0035] Among them, temperature sensor a15 can detect the temperature inside the insulation shell 10, and pressure sensor a16 can monitor the nitrogen pressure above the insulation shell 10 in real time to prevent the vaporized nitrogen pressure from being too high and flowing back into the liquid nitrogen pipeline. The temperature signal and nitrogen pressure signal inside the insulation shell 10 are transmitted in real time to the DCS control system of the production workshop control cabinet to provide real-time feedback on the working conditions in the liquid nitrogen vaporization cylinder 7 and ensure that the liquid nitrogen vaporization proceeds normally.

[0036] Furthermore, a liquid level sensor 17 is provided on the front side of the heat insulation shell 10;

[0037] The liquid level sensor 17 monitors the liquid nitrogen level in the liquid nitrogen vaporization cylinder 7 in real time, keeping the liquid level at a level that allows sufficient space for the liquid nitrogen to vaporize, thus ensuring the maximum vaporization efficiency of the device.

[0038] Furthermore, the height of the upper tube seat of the liquid level sensor 17 is below that of the liquid nitrogen inlet pipe 13;

[0039] The liquid nitrogen inlet pipe 13 is located above the pipe seat of the liquid level sensor 17, so as to prevent the liquid nitrogen inside the liquid nitrogen vaporization cylinder 7 from affecting the liquid nitrogen flowing out of the liquid nitrogen inlet pipe 13.

[0040] Furthermore, an electric valve a18 and a check valve 19 are also installed on the liquid nitrogen connecting pipe 9;

[0041] Among them, the electric valve a18 is controlled by the DCS system in the production workshop control cabinet. When the pressure in the liquid nitrogen vaporization cylinder 7 is abnormal, the liquid nitrogen supply can be cut off in time. The check valve 19 prevents the high-pressure nitrogen in the liquid nitrogen vaporization cylinder 7 from flowing back, improving the reliability and safety of the device and ensuring vaporization efficiency.

[0042] In summary, the device is equipped with a liquid nitrogen vaporization device 6, which allows the heated liquid nitrogen to increase its volume and vaporize within the cylinder space, thus supplying nitrogen gas to the outside. This ensures that even if the electric heater 2 or the steam heater malfunctions, the liquid nitrogen vaporization cylinder 7 can still maintain the vaporization of liquid nitrogen under the insulation effect within the cylinder, reducing the impact of pressure fluctuations caused by the malfunction on the piping components. In conjunction with the DCS control system in the production workshop control cabinet, it automatically performs pre-judgment and adjustment under near-accident conditions, ensuring that the device does not enter an accident state. This significantly reduces the occurrence of manual operation errors, deviations from indicators not detected by operators in time, and interlocking events, improving the reliability and safety of the device. Simultaneously, the vaporized nitrogen gas can be discharged promptly through the nitrogen outlet pipe 12, reducing the impact of nitrogen gas on the liquid nitrogen pipeline and ensuring the vaporization efficiency of the device. The liquid nitrogen heat exchange tube 5 with a coil structure increases the heat exchange area between the liquid nitrogen and the hot water in the water bath 1, further improving the vaporization efficiency of the liquid nitrogen.

[0043] The working principle of this utility model:

[0044] The electric heater 2 in the water bath 1 heats the liquid nitrogen by heating the water entering from the water inlet pipe 20 on the left side of the water bath 1. The steam generated by the heating water is discharged from the exhaust pipe 21 on the right side of the water bath 1. The liquid nitrogen is sent from the left side of the liquid nitrogen heat exchange pipe 5 through the liquid nitrogen delivery pipe 4. After heat exchange with the heating water, it enters the liquid nitrogen vaporization cylinder 7 from the liquid nitrogen delivery pipe 4 on the right. Then, it evaporates and vaporizes into nitrogen gas in the liquid nitrogen vaporization cylinder 7 and is discharged from the liquid nitrogen vaporization cylinder 7. During the heating process of liquid nitrogen in the water bath 1, the temperature sensor b22 and pressure sensor b23 installed on the water bath 1 monitor the temperature and pressure signals inside the water bath 1 in real time. The signals are transmitted to the control cabinet in the production workshop to control the opening and closing of the electric valves on each pipe.

[0045] Liquid nitrogen, after being heated by hot water inside the water bath 1, enters the interior of the insulation shell 10 through the liquid nitrogen connecting pipe 9. The heated liquid nitrogen vaporizes inside the insulation shell 10. Heating steam is introduced into the heating coil 11 through the steam inlet pipe 14 to maintain the temperature inside the insulation shell 10 and ensure efficient vaporization of the liquid nitrogen. The vaporized nitrogen gas is then discharged from the nitrogen outlet pipe 12 above the insulation shell 10. Steam used by the heating coil 11 is transported to the steam heat exchanger 3 of the water bath 1 through the steam connecting pipe 8 on the upper left side of the heating coil 11. The hot water in the medium-heated water bath 1 is discharged from the left end of the steam heat exchanger 3 after heat exchange. By setting up a liquid nitrogen vaporization cylinder 7, the heated liquid nitrogen increases in volume within the cylinder space and vaporizes to deliver nitrogen gas outward. In this way, when the electric heater 2 or the steam heater fails, the liquid nitrogen vaporization cylinder 7 can still ensure that the liquid nitrogen continues to vaporize under the heat preservation effect inside the cylinder, reducing the impact of pressure fluctuations caused by the failure on the pipeline components. At the same time, the vaporized nitrogen gas can also be discharged in time through the nitrogen outlet pipe 12, reducing the impact of nitrogen gas on the liquid nitrogen pipeline and ensuring the vaporization efficiency of the device.

[0046] During the vaporization process of liquid nitrogen in the liquid nitrogen vaporization cylinder 7, temperature sensor a15 can detect the temperature inside the insulation shell 10, and pressure sensor a16 can monitor the nitrogen pressure above the insulation shell 10 in real time to prevent the vaporized nitrogen pressure from being too high and flowing back into the liquid nitrogen pipeline. The temperature signal and nitrogen pressure signal inside the insulation shell 10 are transmitted in real time to the DCS control system of the production workshop control cabinet to provide real-time feedback on the working conditions in the liquid nitrogen vaporization cylinder 7, ensuring that the liquid nitrogen vaporization proceeds normally. Liquid level sensor 17 monitors the liquid nitrogen level in the liquid nitrogen vaporization cylinder 7 in real time to keep the liquid level at a level that allows sufficient space for the liquid nitrogen to vaporize, ensuring the maximum vaporization efficiency of the device.

[0047] The electric valve a18 is controlled by the DCS system in the production workshop control cabinet. When the pressure in the liquid nitrogen vaporization cylinder 7 is abnormal, the liquid nitrogen supply can be cut off in time. The check valve 19 prevents the high-pressure nitrogen in the liquid nitrogen vaporization cylinder 7 from flowing back, improving the reliability of the device and ensuring vaporization efficiency.

[0048] Heating steam enters the liquid nitrogen vaporization cylinder 7 from the lower right side to heat and maintain the liquid nitrogen in the liquid nitrogen vaporization cylinder 7. After heating, it enters the steam heat exchange tube 3 in the water bath 1 through the steam connection pipe 8 to the left, heats the water in the water bath 1, and then exits from the left side of the water bath 1.

[0049] Throughout the process, temperature sensor a15, temperature sensor b22, pressure sensor a16, pressure sensor b23, and level sensor 17 transmit real-time monitoring data of the internal working conditions of the device to the DCS system in the production workshop control cabinet. The DCS system monitors and regulates the device in real time, and works in conjunction with the electric valve control devices installed on each pipeline to ensure normal operation. Under the control of the sensors and electric valves, the device automatically completes pre-judgment and adjustment in the event of an impending accident, and performs proactive adjustment to ensure that the device does not enter an accident state. This can greatly reduce the occurrence of manual misoperation accidents, deviations in indicators not detected by operators in time, and interlocking events, thereby improving the reliability and safety of the device.

[0050] This concludes the description of the working principle of the device.

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0052] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatically adjustable water bath type liquid nitrogen vaporizer, comprising a water bath, an electric heater, a steam heat exchanger tube, a liquid nitrogen delivery pipe, a liquid nitrogen heat exchanger tube, and a liquid nitrogen vaporization device, wherein the water bath is located to the left of the liquid nitrogen vaporization device, the electric heater is located inside and below the water bath, the steam heat exchanger tube is located above the electric heater, the liquid nitrogen delivery pipe is located to the left of the water bath, the liquid nitrogen heat exchanger tube is located between the electric heater and the steam heat exchanger tube, and the left side of the liquid nitrogen heat exchanger tube is connected to the liquid nitrogen delivery pipe; the water bath, electric heater, steam heat exchanger tube, liquid nitrogen delivery pipe, liquid nitrogen heat exchanger tube, and liquid nitrogen vaporization device are respectively electrically connected to a production workshop control cabinet, characterized in that: The liquid nitrogen vaporization device further includes a liquid nitrogen vaporization cylinder, a steam connecting pipe, and a liquid nitrogen connecting pipe. The liquid nitrogen vaporization cylinder is located on the right side of the water bath, and the steam connecting pipe is located on the left side of the liquid nitrogen vaporization cylinder. The left end of the steam connecting pipe is connected to the steam heat exchange pipe in the water bath. The liquid nitrogen connecting pipe is located on the left side of the liquid nitrogen vaporization cylinder, and the left end of the liquid nitrogen connecting pipe is connected to the outlet of the liquid nitrogen heat exchange pipe in the water bath.

2. The automatically adjustable water bath liquid nitrogen vaporizer according to claim 1, characterized in that: The liquid nitrogen heat exchange tube is configured as a coil structure.

3. The automatically adjustable water bath liquid nitrogen vaporizer according to claim 1, characterized in that: The liquid nitrogen vaporization cylinder also includes an insulation shell, a heating coil, a nitrogen outlet pipe, a liquid nitrogen inlet pipe, and a steam inlet pipe. The heating coil is located inside the insulation shell, the nitrogen outlet pipe is located above the insulation shell, the liquid nitrogen inlet pipe is located on the left side of the insulation shell, and the steam inlet pipe is located above the inscription shell.

4. The automatically adjustable water bath liquid nitrogen vaporizer according to claim 3, characterized in that: Insulation material is provided between the heat-insulating outer shell and the heating coil.

5. The automatically adjustable water bath liquid nitrogen vaporizer according to claim 3, characterized in that: Temperature sensor a and pressure sensor a are installed on the top of the heat-insulating shell.

6. The automatically adjustable water bath liquid nitrogen vaporizer according to claim 3, characterized in that: A liquid level sensor is installed on the front side of the aforementioned heat-insulating shell.

7. The automatically adjustable water bath liquid nitrogen vaporizer according to claim 6, characterized in that: The height of the upper tube seat of the liquid level sensor is located below the liquid nitrogen inlet pipe.

8. The automatically adjustable water bath liquid nitrogen vaporizer according to claim 1, characterized in that: The liquid nitrogen connecting pipe is also equipped with an electric valve a and a check valve.

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