A pure and stable pressure source device for converting liquid nitrogen into nitrogen gas

Abstract

The present invention discloses a pure and stable pressure source device for converting liquid nitrogen into nitrogen gas, which belongs to the technical field of liquid nitrogen equipment, and includes a storage tank and a vaporization chamber, wherein the vaporization chamber is arranged on one side of the storage tank; a first baffle, wherein the first baffle is installed on the inner bottom wall of the vaporization chamber; a second baffle, wherein the second baffle is installed on the inner bottom wall of the vaporization chamber, and the height of the second baffle is lower than the height of the first baffle, and the second baffle is located on the right side of the first baffle. The present invention can achieve a more stable and efficient vaporization of liquid nitrogen through multi-stage heating operation. In each heating stage, liquid nitrogen can gradually absorb heat, thereby avoiding thermal stress caused by rapid heating in a single high-temperature area. At the same time, it also avoids the problem of impurities precipitating out of liquid nitrogen and mixing into nitrogen during the rapid heating process, thereby affecting the purity of nitrogen. This stable gasification process can improve the overall gasification efficiency of the equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid nitrogen equipment, and more particularly to a pure and stable pressure source device for converting liquid nitrogen into nitrogen gas. Background Art

[0002] Liquid nitrogen is usually stored in special containers that can withstand extremely low temperatures and keep the liquid nitrogen in liquid form. When liquid nitrogen needs to be converted into nitrogen gas, it needs to be gasified. The gasification process is to heat the liquid nitrogen to above its boiling point to convert it into gaseous nitrogen. In the gasification process, the liquid nitrogen in the container is first extracted by a liquid nitrogen pump and transported to the gasification area. In the gasification area, the liquid nitrogen is heated by a heating device (such as a heater, a heat exchanger, etc.). The heating device transfers heat to the liquid nitrogen, causing its temperature to gradually increase and reach the boiling point. Once the boiling point is reached, the liquid nitrogen will begin to boil and turn into gaseous nitrogen.

[0003] In the process of gasification of liquid nitrogen, the existing technology uses the large specific heat capacity of water to control the temperature, which seems to be an effective solution. However, in practice, there are many problems and limitations in directly using a water bath to heat liquid nitrogen. The boiling point of liquid nitrogen at normal pressure is very low (-196°C). When directly heated in a water bath, since the temperature of water is much higher than the boiling point of liquid nitrogen, liquid nitrogen will quickly absorb heat and vaporize violently, causing the temperature to rise sharply. This rapid temperature change will produce large thermal stress inside the gasification equipment, which may damage the equipment structure and shorten its service life. In addition, liquid nitrogen contains some trace impurities, such as oxygen, carbon dioxide and other impurities. During the rapid heating process, these impurities may be precipitated due to reduced solubility, evaporate in gaseous form, and mix into the generated nitrogen, thereby reducing the purity of nitrogen, which is difficult to meet the needs of fields that require high-purity nitrogen. Direct water bath heating will also make it difficult to accurately control the gasification rate of liquid nitrogen, which will cause large fluctuations in the pressure of the generated nitrogen. The instability of pressure will affect the storage and transportation efficiency of nitrogen.

[0004] In view of this, in view of the above-mentioned deficiencies, the present invention improves and optimizes the liquid nitrogen gasification device in the prior art, and develops a pure and stable pressure source device for converting liquid nitrogen into nitrogen gas. Summary of the invention

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a pure and stable pressure source device for converting liquid nitrogen into nitrogen gas, which can achieve a more stable and efficient gasification of liquid nitrogen through multi-stage heating operation. In each heating stage, liquid nitrogen can gradually absorb heat, thereby avoiding thermal stress caused by rapid heating in a single high-temperature area. At the same time, it also avoids the problem of impurities precipitating out of liquid nitrogen and mixing into nitrogen gas during the rapid heating process, thereby affecting the purity of nitrogen gas. This stable gasification process can improve the overall gasification efficiency of the equipment.

[0006] To solve the above problems, the present invention adopts the following technical solutions.

[0007] A pure and stable pressure source device for converting liquid nitrogen into nitrogen gas, comprising a storage tank and a vaporization chamber, wherein the vaporization chamber is arranged on one side of the storage tank;

[0008] A first water baffle, the first water baffle being installed on the inner bottom wall of the gasification chamber;

[0009] A second baffle, the second baffle is installed on the inner bottom wall of the vaporization chamber, and the height of the second baffle is lower than that of the first baffle, the second baffle is located on the right side of the first baffle, the space formed between the first baffle and the inner wall of the vaporization chamber is a high temperature zone, the space formed between the first baffle and the second baffle is a medium temperature zone, and the space formed between the second baffle and the inner wall of the vaporization chamber is a low temperature zone;

[0010] The gasification pipe is installed inside the gasification chamber. The gasification pipe is arranged in multiple groups side by side. The gasification pipe is designed to be zigzag, and the gasification pipe passes through the low temperature zone, the medium temperature zone, and the high temperature zone from right to left. The right end of the gasification pipe is a liquid inlet, and the left end of the gasification pipe is a liquid outlet;

[0011] An air collecting pipe, the air collecting pipe is installed at the liquid discharge port of the gasification pipe, and the interior of the air collecting pipe is connected with the interior of the gasification pipe;

[0012] An exhaust pipe is fixedly mounted on the gas collecting pipe, a left end of the exhaust pipe penetrates the gasification chamber and extends to the outside, and the interior of the exhaust pipe is communicated with the interior of the gas collecting pipe.

[0013] Further, an air pressure sensor is installed inside the air manifold, and the air pressure sensor is used to detect the pressure inside the air manifold;

[0014] A first heating plate, the first heating plate is installed at the inner bottom of the gasification chamber, and the first heating plate is located in a high temperature zone of the gasification chamber;

[0015] A controller is installed on the outer side of the vaporization chamber, and the controller is electrically connected to the air pressure sensor and the first heating plate. A preset air pressure threshold detected by the air pressure sensor is set. If the air pressure value detected by the air pressure sensor is lower than the air pressure threshold, the controller controls the temperature of the first heating plate to increase; if the air pressure value detected by the air pressure sensor is higher than the air pressure threshold, the controller controls the temperature of the first heating plate to decrease.

[0016] Further, a water pipe, the water pipe is installed outside the gasification chamber, one end of the water pipe is connected to the low temperature area inside the gasification chamber, and the other end of the water pipe is connected to the high temperature area inside the gasification chamber;

[0017] A water pump is installed on a water pipe. The water pump pumps water from the low-temperature area of ​​the vaporization chamber to the high-temperature area through the water pipe. The water pump is electrically connected to the controller. If the air pressure value detected by the air pressure sensor is lower than the air pressure threshold, the controller controls the water pumping speed to slow down; if the air pressure value detected by the air pressure sensor is higher than the air pressure threshold, the controller controls the water pumping speed to speed up.

[0018] Further, a liquid separatory tube is arranged outside the vaporization chamber, the right end of the vaporization tube passes through the vaporization chamber and is connected to the liquid separatory tube, and the interior of the liquid separatory tube is in communication with the interior of the vaporization tube;

[0019] An infusion tube, the infusion tube is installed on the right side of the liquid dispensing tube, the right end of the infusion tube is connected to the storage tank, and the interior of the liquid dispensing tube and the interior of the storage tank are connected to each other through the infusion tube;

[0020] A liquid nitrogen pump is installed on an infusion tube. The liquid nitrogen pump is used to extract liquid nitrogen from a storage tank and transport it to a dispensing tube. The liquid nitrogen pump is electrically connected to a controller. If the air pressure value detected by the air pressure sensor is lower than the air pressure threshold, the controller controls the liquid nitrogen pump to pump liquid faster; if the air pressure value detected by the air pressure sensor is higher than the air pressure threshold, the controller controls the liquid nitrogen pump to pump liquid slower.

[0021] Furthermore, the second heating plate and the third heating plate are both installed on the inner bottom of the vaporization chamber, the second heating plate is located in the medium temperature zone, and the third heating plate is located in the high temperature zone. The second heating plate and the third heating plate are electrically connected to the controller. If the air pressure value detected by the air pressure sensor is lower than the air pressure threshold, the controller controls the second heating plate and the third heating plate to heat up; if the air pressure value detected by the air pressure sensor is higher than the air pressure threshold, the controller controls the second heating plate and the third heating plate to cool down.

[0022] Furthermore, the first temperature sensor, the second temperature sensor and the third temperature sensor are all installed inside the vaporization chamber, the first temperature sensor is used to detect the temperature of the high temperature zone, the second temperature sensor is used to detect the temperature of the medium temperature zone, and the third temperature sensor is used to detect the temperature of the low temperature zone, and the first temperature sensor, the second temperature sensor and the third temperature sensor are electrically connected to the controller.

[0023] Further, a water receiving pipe, the water receiving pipe is installed at the lower end of the gasification pipe, the interior of the water receiving pipe is connected with the interior of the gasification pipe, and the gasification pipe is located in the high temperature zone;

[0024] The first liquid level sensor is installed at the inner bottom of the water receiving pipe, the first liquid level sensor is used to detect the liquid nitrogen in the water receiving pipe, and the first liquid level sensor is electrically connected to the controller.

[0025] Furthermore, a second liquid level sensor is installed on the outside of the storage tank, the second liquid level sensor is arranged in multiple groups, the multiple groups of the second liquid level sensors are evenly arranged from top to bottom, and the second liquid level sensor is electrically connected to the controller.

[0026] Furthermore, a buzzer is installed outside the controller, and the buzzer is electrically connected to the controller.

[0027] Furthermore, the outer surfaces of the vaporization chamber and the storage tank are both wrapped with a layer of thermal insulation cotton.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) This solution helps liquid nitrogen to vaporize more smoothly and efficiently through multi-stage heating operation. In each heating stage, liquid nitrogen can gradually absorb heat, thereby avoiding thermal stress caused by rapid heating in a single high-temperature area. It also avoids the problem of impurities precipitating out of liquid nitrogen and mixing with nitrogen during the rapid heating process, affecting the purity of nitrogen. This smooth gasification process can improve the overall gasification efficiency of the equipment. In each heating stage, liquid nitrogen can absorb and utilize the corresponding heat energy, thereby avoiding energy waste and reducing energy consumption.

[0030] (2) This solution uses an air pressure sensor to monitor the air pressure in the gas manifold in real time, and can detect fluctuations in air pressure in a timely manner, thereby ensuring the stability and safety of the system operation. When the air pressure detected by the air pressure sensor changes and does not reach the exhaust pressure standard, the device can respond quickly by adjusting the water bath temperature, water pump flow rate, and liquid nitrogen pump flow rate in the high, medium, and low temperature zones to effectively suppress further fluctuations in air pressure, thereby achieving rapid stabilization of air pressure and sensitive response. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 This is an appearance view of the overall structure of the present invention;

[0033] Figure 2 It is a schematic diagram of the structure inside the gasification chamber of the present invention;

[0034] Figure 3 It is a structural schematic diagram of the gasification tube of the present invention;

[0035] Figure 4 It is a schematic diagram of the bottom structure of the gasification chamber of the present invention;

[0036] Figure 5 It is a schematic diagram of the structure inside the gas collecting pipe of the present invention;

[0037] Figure 6 It is a schematic diagram of the structure inside the water receiving pipe of the present invention.

[0038] Description of the numbers in the figure:

[0039] 1. Storage tank; 2. Vaporization chamber; 3. First water baffle; 4. Second water baffle; 5. Infusion tube; 6. Dispensing tube; 7. Vaporization tube; 8. Exhaust pipe; 9. First heating plate; 10. First temperature sensor; 11. Controller; 12. Water pipe; 13. Water pump; 14. Liquid nitrogen pump; 15. Second heating plate; 16. Second temperature sensor; 17. Third heating plate; 18. Third temperature sensor; 19. Gas manifold; 20. Air pressure sensor; 21. Water connecting pipe; 22. First liquid sensor; 23. Second liquid sensor; 24. Buzzer. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0041] Example 1

[0042] See also Figures 1 to 6, a pure stable pressure source device for converting liquid nitrogen into nitrogen, comprising a storage tank 1 and a vaporization chamber 2, the vaporization chamber 2 being arranged on one side of the storage tank 1; a first baffle 3, the first baffle 3 being installed on the inner bottom wall of the vaporization chamber 2; a second baffle 4, the second baffle 4 being installed on the inner bottom wall of the vaporization chamber 2, and the height of the second baffle 4 being lower than the height of the first baffle 3, the second baffle 4 being located on the right side of the first baffle 3, the space formed between the first baffle 3 and the inner wall of the vaporization chamber 2 being a high temperature zone, the space formed between the first baffle 3 and the second baffle 4 being a medium temperature zone, and the space formed between the second baffle 4 and the inner wall of the vaporization chamber 2 being a The space formed is a low-temperature zone; a gasification pipe 7, which is installed inside the gasification chamber 2, and the gasification pipe 7 is arranged in multiple groups side by side. The gasification pipe 7 is designed to be tortuous, and the gasification pipe 7 passes through the low-temperature zone, the medium-temperature zone, and the high-temperature zone from right to left in sequence. The right end of the gasification pipe 7 is a liquid inlet, and the left end of the gasification pipe 7 is a liquid discharge port; a gas collection pipe 19, which is installed at the liquid discharge port of the gasification pipe 7, and the interior of the gas collection pipe 19 is interconnected with the interior of the gasification pipe 7; an exhaust pipe 8, which is fixedly installed on the exhaust pipe 19, and the left end of the exhaust pipe 8 passes through the gasification chamber 2 and extends to the outside, and the interior of the exhaust pipe 8 is interconnected with the interior of the gas collection pipe 19;

[0043] A water pipe 12 is installed outside the gasification chamber 2, one end of the water pipe 12 is connected to the low temperature zone inside the gasification chamber 2, and the other end of the water pipe 12 is connected to the high temperature zone inside the gasification chamber 2; a water pump 13 is installed on the water pipe 12, and the water pump 13 pumps water from the low temperature zone of the gasification chamber 2 to the high temperature zone through the water pipe 12 for transportation; a liquid separator 6 is installed outside the gasification chamber 2, and the right end of the gasification pipe 7 passes through the gasification chamber 2 and is connected to the liquid separator 6, and the inside of the liquid separator 6 is connected to the gasification chamber 2. The interiors of the vaporization tubes 7 are interconnected; the infusion tube 5, which is installed on the right side of the liquid dispensing tube 6, the right end of the infusion tube 5 is connected to the storage tank 1, and the interior of the liquid dispensing tube 6 and the interior of the storage tank 1 are interconnected through the infusion tube 5; the liquid nitrogen pump 14, which is installed on the infusion tube 5, and the liquid nitrogen pump 14 is used to extract liquid nitrogen from the storage tank 1 and transport it to the liquid dispensing tube 6, the first heating plate 9, the first heating plate 9 is installed on the inner bottom of the vaporization chamber 2, and the first heating plate 9 is located in the high temperature zone of the vaporization chamber 2.

[0044] The storage tank 1 of the present invention is used to store liquid nitrogen. When liquid nitrogen needs to be converted into nitrogen gas, the first heating plate 9 is first turned on. The high temperature zone, medium temperature zone and low temperature zone of the present invention are all filled with an appropriate amount of water. The first heating plate 9 heats the water in the high temperature zone, and the water pump 13 draws water from the low temperature zone to the high temperature zone. The amount of water in the high temperature zone will increase and finally overflow the first water baffle 3. The hot water in the high temperature zone will come to the medium temperature zone. As the amount of water in the medium temperature zone increases, the hot water in the medium temperature zone will overflow the second water baffle 4, and the hot water in the medium temperature zone will flow into the low temperature zone, realizing the circulation of hot water. At this time, the liquid nitrogen pump 14 is turned on. The liquid nitrogen pump 14 draws the liquid nitrogen in the storage tank 1 through the infusion tube 5, and then transports it to the liquid separator 6, and then transports it to the gasification tube 7 through the liquid separator 6. The gasification tube 7 passes through the low temperature zone, the medium temperature zone and the high temperature zone in sequence; when the liquid nitrogen in the gasification tube 7 passes through the low temperature zone, Liquid nitrogen will be gasified into nitrogen in a gas-liquid state. The nitrogen in a gas-liquid state will be further gasified when entering the medium temperature zone and will be gasified into nitrogen in a complete state. When the nitrogen enters the high temperature zone, it will be further gasified to prevent the nitrogen in a gas-liquid state from being incompletely gasified. The gasification operation of the liquid nitrogen is thus completed, and finally the nitrogen is discharged from the exhaust pipe 8. The present invention helps to gasify the liquid nitrogen more steadily and efficiently through a multi-stage heating operation. In each heating stage, the liquid nitrogen can gradually absorb heat, thereby avoiding the thermal stress caused by the rapid heating in a single high temperature area. At the same time, it also avoids the problem that impurities in the liquid nitrogen are precipitated and mixed into the nitrogen during the rapid heating process, thereby affecting the purity of the nitrogen. This stable gasification process can improve the overall gasification efficiency of the equipment. In each heating stage, the liquid nitrogen can absorb and utilize the corresponding thermal energy, thereby avoiding energy waste and reducing energy consumption.

[0045] In some embodiments, an air pressure sensor 20 is installed inside the air manifold 19, and the air pressure sensor 20 is used to detect the pressure inside the air manifold 19; a controller 11 is installed on the outer side of the vaporization chamber 2, and the controller 11 is electrically connected to the air pressure sensor 20 and the first heating plate 9, and a preset air pressure threshold detected by the air pressure sensor 20 is set. If the air pressure value detected by the air pressure sensor 20 is lower than the air pressure threshold, the controller 11 controls the temperature of the first heating plate 9 to increase; if the air pressure value detected by the air pressure sensor 20 is higher than the air pressure threshold, the controller 11 controls the temperature of the first heating plate 9 to decrease.

[0046] If the air pressure sensor 20 detects that the air pressure value inside the gas manifold 19 is lower than the preset air pressure threshold, the signal is fed back to the controller 11, and the controller 11 controls the temperature of the first heating plate 9 to increase, and the water in the corresponding high temperature zone will also increase. The water with increased temperature will flow into the medium temperature zone to heat the gasification pipe 7, and finally flow into the low temperature zone, completing the heating of the water in the high temperature zone, the medium temperature zone, and the low temperature zone, so as to improve the gasification effect and gasification efficiency of liquid nitrogen, thereby quickly increasing the air pressure in the gas manifold 19 and raising it to the preset air pressure threshold. When the air pressure sensor 20 detects that the air pressure value inside the gas manifold 19 is within the preset air pressure threshold, the controller 11 no longer controls the first heating plate 9 to continue heating up, but controls the first heating plate 9 to maintain a stable temperature;

[0047] If the air pressure sensor 20 detects that the air pressure value inside the gas collecting pipe 19 is higher than the preset air pressure threshold, the controller 11 will control the temperature of the first heating plate 9 to decrease, and the water in the corresponding high temperature zone, medium temperature zone and low temperature zone will also decrease, thereby reducing the gasification efficiency of the liquid nitrogen in the gasification pipe 7, thereby reducing the air pressure value inside the gas collecting pipe 19. By stably controlling the air pressure value inside the gas collecting pipe 19, the air pressure discharged from the exhaust pipe 8 can be kept in a stable state.

[0048] Example 2

[0049] In some embodiments, the water pump 13 is electrically connected to the controller 11. If the air pressure value detected by the air pressure sensor 20 is lower than the air pressure threshold, the controller 11 controls the water pump 13 to pump water more slowly; if the air pressure value detected by the air pressure sensor 20 is higher than the air pressure threshold, the controller 11 controls the water pump 13 to pump water more quickly.

[0050] When the air pressure value inside the air collecting pipe 19 is lower than or higher than the preset threshold value or lower than the preset threshold value, when the scheme is implemented in Example 1, it is impossible to quickly stabilize the air pressure value inside the air collecting pipe 19 within the preset threshold value. For example, when it is necessary to heat the water in the high temperature zone to a suitable temperature, if the water pump 13 pumps water too fast, the water flow rate in the high temperature zone, the medium temperature zone and the low temperature zone will be reduced, resulting in the water in the high temperature zone flowing away before it has time to be heated, resulting in a longer time to heat the water in the high temperature zone to a suitable temperature; when it is necessary to cool the water in the high temperature zone, if the water pump 13 pumps water too slowly, compared with the water pump 13 pumping water too fast, cooling the water in the high temperature zone to control the water pump 13 to pump water faster , it is easier to lower the water temperature in the high temperature zone. In the present invention, when the air pressure sensor 20 detects that the air pressure value is lower than the air pressure threshold, the controller 11 controls the water pumping speed of the water pump 13 to slow down, thereby quickly increasing the water temperature in the high temperature zone and accelerating the gasification efficiency of the gas-liquid nitrogen; if the air pressure sensor 20 detects that the air pressure value is higher than the air pressure threshold, the controller 11 controls the water pumping speed of the water pump 13 to speed up, thereby quickly lowering the water temperature in the high temperature zone. When the first heating plate 9 and the water pump 13 are controlled at the same time, compared with Example 1, Example 2 stabilizes the air pressure inside the gas manifold 19 faster and reacts more sensitively. The air pressure control method in Example 2 can be controlled by the following calculation formula:

[0051]

[0052] in is the pressure inside the gas manifold 19, that is, the value detected by the air pressure sensor 20; The water bath temperature in the high temperature zone can be obtained by installing a temperature sensor in the high temperature zone; It is represented as the water flow rate of the water pump 13. The water flow rate of the water pump 13 can be obtained by installing a water flow sensor on the water pipe 12. is a constant and needs to be fitted by experimental data.

[0053] Example 3

[0054] In some embodiments, the liquid nitrogen pump 14 is electrically connected to the controller 11. If the air pressure value detected by the air pressure sensor 20 is lower than the air pressure threshold, the controller 11 controls the liquid nitrogen pump 14 to pump liquid faster; if the air pressure value detected by the air pressure sensor 20 is higher than the air pressure threshold, the controller 11 controls the liquid nitrogen pump 14 to pump liquid slower.

[0055] Although the implementation method in Example 2 can improve the efficiency of stabilizing the air pressure in the gas manifold 19 to a certain extent, there are still certain limitations. For example, when the air pressure in the gas manifold 19 is lower than the preset threshold, the gasification efficiency of the liquid nitrogen can be improved to a certain extent by increasing the output of the liquid nitrogen, that is, increasing the flow rate of the liquid nitrogen pump 14; when the air pressure in the gas manifold 19 is higher than the preset threshold, the gasification efficiency of the liquid nitrogen can be reduced to a certain extent by reducing the output of the liquid nitrogen. Compared with the implementation method in Example 2, Example 3 stabilizes the air pressure inside the gas manifold 19 faster and more responsive. The control calculation formula for the air pressure inside the gas manifold 19 in Example 3 can be:

[0056]

[0057] in, The flow rate of the liquid nitrogen pump 14 extracting liquid nitrogen can be measured by installing a water flow sensor; is a constant and needs to be fitted by experimental data.

[0058] Example 4

[0059] In some embodiments, the second heating plate 15 and the third heating plate 17 are both installed at the inner bottom of the vaporization chamber 2, the second heating plate 15 is located in the medium temperature zone, the third heating plate 17 is located in the high temperature zone, the second heating plate 15 and the third heating plate 17 are electrically connected to the controller 11, if the air pressure value detected by the air pressure sensor 20 is lower than the air pressure threshold, the controller 11 controls the second heating plate 15 and the third heating plate 17 to heat up; if the air pressure value detected by the air pressure sensor 20 is higher than the air pressure threshold, the controller 11 controls the second heating plate 15 and the third heating plate 17 to cool down;

[0060] The first temperature sensor 10, the second temperature sensor 16 and the third temperature sensor 18 are all installed inside the vaporization chamber 2. The first temperature sensor 10 is used to detect the temperature of the high temperature zone, the second temperature sensor 16 is used to detect the temperature of the medium temperature zone, and the third temperature sensor 18 is used to detect the temperature of the low temperature zone. The first temperature sensor 10, the second temperature sensor 16 and the third temperature sensor 18 are electrically connected to the controller 11.

[0061] When increasing the water temperature in the high temperature zone, the medium temperature zone and the low temperature zone, the water temperature is increased as a whole only by the circulation of the first heating plate 9 and the water. However, there are still certain deficiencies in efficiency during implementation. The present invention heats the water in the medium temperature zone by the second heating plate 15, and heats the water temperature in the low temperature zone by the third heating plate 17. The first temperature sensor 10, the second temperature sensor 16 and the third temperature sensor 18 detect problems in the corresponding areas, and at the same time, a water bath threshold is set for the temperature to which the water in the corresponding area is heated. The water bath threshold in the high temperature zone is greater than the water bath threshold in the medium temperature zone, and the water bath threshold in the medium temperature zone is greater than the water bath threshold in the low temperature zone. This can prevent the problem caused by the sudden gasification of liquid nitrogen. When the first temperature sensor 10, the second temperature sensor 16 and the third temperature sensor 18 detect that the corresponding area reaches the water bath threshold, the controller 11 controls the heating plate in the corresponding area to stop heating and maintain the temperature. Through the above operation, the pressure stabilization operation of the gas collection pipe 19 in Example 4 is faster than that in Example 3 in terms of reaction rate, which greatly ensures that the exhaust pipe 8 can be discharged at a very stable gas pressure. The control calculation formula for the internal gas pressure of the gas collection pipe 19 in Example 4 can be:

[0062]

[0063] in, The water bath temperature can be detected by the first temperature sensor 10. is the water bath temperature in the medium temperature zone; The water bath temperature can be detected by the second temperature sensor 16; is the water bath temperature in the low temperature zone, which can be detected by the third temperature sensor 18. , , It shows the influence of the temperature of the three heating plates on the gas pressure. The higher the temperature of the heating plate, the higher the temperature of the water, thereby improving the gasification efficiency of the liquid nitrogen and further increasing the gas pressure. , , , , , , is a constant, obtained by fitting the actual system data.

[0064] In some embodiments, a water receiving pipe 21 is installed at the lower end of the gasification pipe 7, the interior of the water receiving pipe 21 is interconnected with the interior of the gasification pipe 7, and the gasification pipe 7 is located in a high temperature zone; a first liquid sensor 22 is installed at the inner bottom of the water receiving pipe 21, the first liquid sensor 22 is used to detect liquid nitrogen in the water receiving pipe 21, and the first liquid sensor 22 is electrically connected to the controller 11.

[0065] When the extraction flow rate of the liquid nitrogen pump 14 increases too much, the liquid nitrogen in the gasification tube 7 cannot be gasified in time. When the liquid nitrogen flows to the first liquid sensor 22, the first liquid sensor 22 detects the presence of liquid, and then feeds back the signal to the controller 11. At this time, the controller 11 controls the liquid nitrogen pump 14 to no longer increase the extraction capacity of liquid nitrogen, but to maintain the extraction capacity of liquid nitrogen, so that the problem of insufficient gasification of liquid nitrogen can be solved to a certain extent.

[0066] In some embodiments, a second liquid level sensor 23 is installed on the outside of the storage tank 1, the second liquid level sensor 23 is arranged in multiple groups, and the multiple groups of second liquid level sensors 23 are evenly arranged from top to bottom, the second liquid level sensor 23 is electrically connected to the controller 11, and a buzzer 24 is installed on the outside of the controller 11, and the buzzer 24 is electrically connected to the controller 11.

[0067] The present invention detects the content of liquid nitrogen in the storage tank 1 through the second liquid sensor 23, and can know the content of liquid nitrogen in the storage tank 1 in real time. The threshold value of low amount of liquid nitrogen in the storage tank 1 can be set. When the liquid nitrogen content is lower than the threshold value, the controller 11 controls the buzzer 24 to alarm, so as to remind the staff in time.

[0068] In some embodiments, the outer surfaces of the vaporization chamber 2 and the storage tank 1 are wrapped with a layer of thermal insulation cotton, which can keep the vaporization chamber 2 and the storage tank 1 warm.

[0069] The above are only preferred specific implementations of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and improved concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pure and stable pressure source device for converting liquid nitrogen into nitrogen gas, characterized in that: include: A storage tank (1) and a vaporization chamber (2), wherein the vaporization chamber (2) is arranged on one side of the storage tank (1); A first water baffle (3), the first water baffle (3) being installed on the inner bottom wall of the gasification chamber (2); a second baffle (4), wherein the second baffle (4) is installed on the inner bottom wall of the vaporization chamber (2), and the height of the second baffle (4) is lower than the height of the first baffle (3), the second baffle (4) is located on the right side of the first baffle (3), the space formed between the first baffle (3) and the inner wall of the vaporization chamber (2) is a high temperature zone, the space formed between the first baffle (3) and the second baffle (4) is a medium temperature zone, and the space formed between the second baffle (4) and the inner wall of the vaporization chamber (2) is a low temperature zone; A gasification pipe (7), the gasification pipe (7) being installed inside the gasification chamber (2), the gasification pipe (7) being arranged in a plurality of groups in parallel, the gasification pipe (7) being of a zigzag design, and the gasification pipe (7) passing through a low temperature zone, a medium temperature zone, and a high temperature zone from right to left in sequence, the right end of the gasification pipe (7) being a liquid inlet, and the left end of the gasification pipe (7) being a liquid outlet; an air collecting pipe (19), the air collecting pipe (19) being installed at the liquid discharge port of the gasification pipe (7), the interior of the air collecting pipe (19) being in communication with the interior of the gasification pipe (7); an exhaust pipe (8), the exhaust pipe (8) being fixedly mounted on the gas collecting pipe (19), the left end of the exhaust pipe (8) penetrating the gasification chamber (2) and extending to the outside, the interior of the exhaust pipe (8) being in communication with the interior of the gas collecting pipe (19); An air pressure sensor (20), the air pressure sensor (20) being installed inside the air collecting pipe (19), the air pressure sensor (20) being used to detect the pressure inside the air collecting pipe (19); a first heating plate (9), the first heating plate (9) being installed at the inner bottom of the vaporization chamber (2), the first heating plate (9) being located in a high temperature zone of the vaporization chamber (2); A controller (11), the controller (11) being mounted on an outer side of the vaporization chamber (2), the controller (11) being electrically connected to the air pressure sensor (20) and the first heating plate (9), and setting a preset air pressure threshold value detected by the air pressure sensor (20); if the air pressure value detected by the air pressure sensor (20) is lower than the air pressure threshold value, the controller (11) controls the temperature of the first heating plate (9) to increase; if the air pressure value detected by the air pressure sensor (20) is higher than the air pressure threshold value, the controller (11) controls the temperature of the first heating plate (9) to decrease.

2. A pure and stable pressure source device for converting liquid nitrogen into nitrogen gas according to claim 1, characterized in that: include: a water pipe (12), the water pipe (12) being installed outside the gasification chamber (2), one end of the water pipe (12) being connected to a low-temperature zone inside the gasification chamber (2), and the other end of the water pipe (12) being connected to a high-temperature zone inside the gasification chamber (2); A water pump (13), the water pump (13) being mounted on the water pipe (12), the water pump (13) pumping water from the low-temperature area of ​​the vaporization chamber (2) to the high-temperature area through the water pipe (12) for transporting the water, the water pump (13) being electrically connected to the controller (11), and if the air pressure value detected by the air pressure sensor (20) is lower than the air pressure threshold, the controller (11) controls the water pumping speed of the water pump (13) to be slowed down; if the air pressure value detected by the air pressure sensor (20) is higher than the air pressure threshold, the controller (11) controls the water pumping speed of the water pump (13) to be faster.

3. A pure and stable pressure source device for converting liquid nitrogen into nitrogen gas according to claim 2, characterized in that: include: a liquid separation pipe (6), the liquid separation pipe (6) being arranged outside the vaporization chamber (2), the right end of the vaporization pipe (7) passing through the vaporization chamber (2) and being connected to the liquid separation pipe (6), the interior of the liquid separation pipe (6) being in communication with the interior of the vaporization pipe (7); an infusion tube (5), the infusion tube (5) being installed on the right side of the liquid dispensing tube (6), the right end of the infusion tube (5) being connected to the storage tank (1), the interior of the liquid dispensing tube (6) and the interior of the storage tank (1) being connected to each other via the infusion tube (5); A liquid nitrogen pump (14), the liquid nitrogen pump (14) being mounted on a liquid infusion tube (5), the liquid nitrogen pump (14) being used to extract liquid nitrogen from a storage tank (1) and to transport it into a liquid dispensing tube (6), the liquid nitrogen pump (14) being electrically connected to a controller (11), and if the air pressure value detected by the air pressure sensor (20) is lower than an air pressure threshold, the controller (11) controls the liquid nitrogen pump (14) to pump liquid faster; if the air pressure value detected by the air pressure sensor (20) is higher than the air pressure threshold, the controller (11) controls the liquid nitrogen pump (14) to pump liquid slower.

4. A pure and stable pressure source device for converting liquid nitrogen into nitrogen gas according to claim 3, characterized in that: include: A second heating plate (15) and a third heating plate (17), wherein the second heating plate (15) and the third heating plate (17) are both installed at the inner bottom of the vaporization chamber (2), the second heating plate (15) is located in a medium temperature zone, and the third heating plate (17) is located in a high temperature zone, the second heating plate (15) and the third heating plate (17) are electrically connected to a controller (11), and if the air pressure value detected by the air pressure sensor (20) is lower than an air pressure threshold, the controller (11) controls the second heating plate (15) and the third heating plate (17) to increase the temperature; if the air pressure value detected by the air pressure sensor (20) is higher than the air pressure threshold, the controller (11) controls the second heating plate (15) and the third heating plate (17) to decrease the temperature.

5. A pure and stable pressure source device for converting liquid nitrogen into nitrogen gas according to claim 4, characterized in that: include: A first temperature sensor (10), a second temperature sensor (16) and a third temperature sensor (18); the first temperature sensor (10), the second temperature sensor (16) and the third temperature sensor (18) are all installed inside the vaporization chamber (2); the first temperature sensor (10) is used to detect the temperature of the high temperature zone; the second temperature sensor (16) is used to detect the temperature of the medium temperature zone; the third temperature sensor (18) is used to detect the temperature of the low temperature zone; the first temperature sensor (10), the second temperature sensor (16) and the third temperature sensor (18) are electrically connected to the controller (11).

6. A pure and stable pressure source device for converting liquid nitrogen into nitrogen gas according to claim 5, characterized in that: include: a water receiving pipe (21), the water receiving pipe (21) being installed at the lower end of the gasification pipe (7), the interior of the water receiving pipe (21) being in communication with the interior of the gasification pipe (7), and the gasification pipe (7) being located in a high temperature zone; A first liquid level sensor (22), the first liquid level sensor (22) being installed at the inner bottom of the water receiving pipe (21), the first liquid level sensor (22) being used to detect liquid nitrogen in the water receiving pipe (21), and the first liquid level sensor (22) being electrically connected to the controller (11).

7. A pure and stable pressure source device for converting liquid nitrogen into nitrogen gas according to claim 6, characterized in that: include: A second liquid level sensor (23), the second liquid level sensor (23) is installed outside the storage tank (1), the second liquid level sensor (23) is arranged in multiple groups, the multiple groups of the second liquid level sensors (23) are evenly arranged from top to bottom, and the second liquid level sensor (23) is electrically connected to the controller (11).

8. A pure and stable pressure source device for converting liquid nitrogen into nitrogen gas according to claim 7, characterized in that: include: A buzzer (24), wherein the buzzer (24) is installed outside the controller (11), and the buzzer (24) is electrically connected to the controller (11).

9. A pure and stable pressure source device for converting liquid nitrogen into nitrogen gas according to claim 8, characterized in that: The outer surfaces of the vaporization chamber (2) and the storage tank (1) are both wrapped with a layer of heat-insulating cotton.

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